JP4879879B2 - Cylindrical material upsetting method and cylindrical material upsetting apparatus - Google Patents

Description

  The present invention relates to a tubular material upsetting method and a tubular material upsetting apparatus for increasing a thickness of a predetermined portion of a cylindrical material to bulge inward or outward.

  Generally, the upsetting process is to increase the diameter of a planned processing portion of the material by pressing a rod-shaped material in the axial direction. In this upsetting process, if the planned processing portion of the material buckles during processing, the resulting product (upset processed product) has a defective shape (wrinkles, fogging, etc.) and the value as a product is impaired. Therefore, in order to prevent the planned processing portion from buckling, conventionally, the following upsetting method is known.

  In other words, the material is fixed to the fixed die, and the planned processing portion of the material is inserted into the insertion hole provided in the guide to keep the planned processing portion in a buckling-prevented state. Next, processing the material exposed between the tip of the guide and the fixed die by moving the guide in the direction opposite to the direction of punch movement while pressurizing the material processing planned portion with the punch in the axial direction This is a method of expanding the diameter of the part (see, for example, Patent Document 1-2).

The conventional upsetting method is applied when the diameter of a planned processing portion of a solid material is increased.
JP-A-48-62646 Japanese Patent Laid-Open No. 9-253782

  Thus, when the material is in a tubular shape such as a pipe shape, a part of the tubular material in the axial direction is bulged inward or outward so as to increase the thickness by the conventional upsetting method. In other words, the following disadvantages have been encountered when increasing the thickness of a cylindrical material.

  That is, since the cylindrical material has a hollow portion therein, a part of the material is bent (buckled) inwardly or outwardly during upsetting, and shape defects are likely to occur.

  The present invention has been made in view of the above-described technical background, and the object thereof is a cylindrical shape that can reliably bulge the planned processing portion of the cylindrical material inward or outward so that the wall thickness increases. An object of the present invention is to provide a material upsetting method, an upsetting product obtained by the upsetting method, and a cylindrical material upsetting apparatus that can be suitably used for the upsetting method.

  The present invention provides the following means.

[1] By disposing the mandrel in the hollow portion of the planned processing portion and the non-processing planned portion of the cylindrical material, the inner peripheral surface of the processing planned portion and the non-processing planned portion is restrained by the peripheral surface of the mandrel. ,
By constraining the non-scheduled part of the material in a restraint hole provided in the restraint die so as to extend in the axial direction thereof, the outer peripheral surface of the non-scheduled part is restrained by the peripheral surface of the restraint hole,
And while arranging the processing planned part of the material in the molding recess provided in the axial direction end of the constraining die,
Place the planned processing part of the material in the insertion hole provided in the guide in the axial direction,
Next, while pressing the planned processing portion of the material in the axial direction with a punch, the guide is moved in the direction opposite to the moving direction of the punch so that the thickness of the processing planned portion of the material is increased in the molding recess. A method for upsetting a cylindrical material, characterized by bulging outward.

  [2] The upsetting method for a cylindrical material according to the item 1, wherein the guide is moved by the driving force of the guide driving device.

[3] The average moving speed from the start of punch movement is P,
G, the average moving speed from the start of guide movement
The buckling limit length in the cross-sectional area of the planned processing part of the material before upsetting is X ₀ ,
The initial clearance between the tip of the guide and the bottom of the molding recess is X (where 0 ≦ X ≦ X ₀ ),
The length of the material before upsetting necessary for the bulge is L ₀ ,
The stop position of the tip of the punch obtained from the design volume of the bulge with respect to the bottom of the molding recess is X _P
The stop position of the tip of the guide determined by design relative to the bottom of the molding recess is X _g ,
The time lag from the start of punch movement to the start of guide movement is t ₀ (where 0 ≦ t ₀ ),
Then G is
G = (X _g −X) P / (L ₀ −X _P −Pt ₀ )
3. A method for upsetting a cylindrical material as described in 1 or 2 above, which satisfies the formula:

  [4] The upsetting method for a cylindrical material according to item 1 above, wherein the guide is moved by a push-back force acting on the guide by press-fitting the material into the forming recess of the material to be processed.

  [5] The upsetting method for a cylindrical material according to any one of the preceding items 1 to 4, wherein a tip end portion of the punch is formed in a cross-sectional shape corresponding to a cross-sectional shape of an axial end portion of the material.

  [6] The tubular material upsetting method according to any one of items 1 to 5, wherein the mandrel is connected to the punch in a state of extending in the axial direction of the punch.

[7] The mandrel is connected to the punch via an expansion / contraction device capable of expanding and contracting in the axial direction,
7. The method for upsetting a cylindrical material as recited in the aforementioned Item 6, wherein the telescopic device is shortened as the punch moves.

  [8] The cylindrical material according to any one of the preceding items 1 to 7, wherein the portion to be processed of the material is bulged while the portion corresponding to the tip of the guide in the portion to be processed of the material is locally heated. Upsetting method.

  [9] The upsetting method for a tubular material according to the above item 8, wherein a portion of the material to be processed corresponding to the tip of the guide is locally induction-heated by induction heating means.

  [10] The cylindrical shape according to item 8 above, wherein the portion corresponding to the tip end portion of the guide in the processing target portion of the material is locally heated by induction heating the axial end portion of the constraining die locally by induction heating means. Material upsetting method.

  [11] The upsetting method according to any one of items 8 to 10, wherein a portion corresponding to the tip portion of the guide in the processing portion of the material is locally heated to a semi-molten state.

  [12] In the above items 8 to 11, the portion to be processed of the material is expanded in a state where the portion corresponding to the portion closer to the base end than the distal end portion of the guide in the portion to be processed of the material is locally cooled by the cooling means. The upsetting method according to any one of the preceding claims.

  [13] A cylindrical upsetting product obtained by the cylindrical material upsetting method according to any one of 1 to 12 above.

[14] By arranging a mandrel in the hollow part of the non-scheduled part of the axial direction intermediate part of the cylindrical material and the planned part of both sides of the axial direction, the inner periphery of the non-scheduled part and both the planned parts While restraining the surface with the peripheral surface of the mandrel,
By constraining the non-scheduled part of the material in a restraint hole provided in the restraint die so as to extend in the axial direction thereof, the outer peripheral surface of the non-scheduled part is restrained by the peripheral surface of the restraint hole,
And both the planned processing parts of the material are arranged in the molding recesses provided at both ends in the axial direction of the constraint die,
Each processing planned portion of the material is arranged in an insertion hole provided in the guide so as to extend in the axial direction,
Next, while simultaneously pressing each planned processing portion of the material in the axial direction with a punch, each guide is moved in a direction opposite to the corresponding moving direction of the punch, thereby corresponding to each processing planned portion of the material. A method for upsetting a cylindrical material, characterized by bulging outward so that the thickness increases in a molding recess.

  [15] The tubular material upsetting method according to item 14, wherein each guide is moved by a driving force of a corresponding guide driving device.

[16] In at least one of the two guides and a punch corresponding to the guide,
The average moving speed from the start of punch movement is P,
G, the average moving speed from the start of guide movement
The buckling limit length in the cross-sectional area of the planned processing part of the material before upsetting is X ₀ ,
The initial clearance between the tip of the guide and the bottom of the molding recess is X (where 0 ≦ X ≦ X ₀ ),
The length of the material before upsetting necessary for the bulge is L ₀ ,
The stop position of the tip of the punch, which is obtained from the design volume of the bulge, with respect to the bottom of the molding recess is X _P ,
The stop position of the tip of the guide determined by design relative to the bottom of the molding recess is X _g ,
The time lag from the start of punch movement to the start of guide movement is t ₀ (where 0 ≦ t ₀ ),
Then G is
G = (X _g −X) P / (L ₀ −X _P −Pt ₀ )
16. The method for upsetting a cylindrical material as described in 14 or 15 above, which satisfies the formula:

  [17] The tubular material upsetting method according to the above item 14, wherein each guide is moved by a push-back force acting on the guide by press-fitting the material of the material to be processed corresponding to the material into the molding recess.

  [18] The upsetting method according to any one of items 14 to 17, wherein a tip portion of each punch is formed in a cross-sectional shape corresponding to a cross-sectional shape of a corresponding axial end portion of the material.

[19] The mandrel is divided into two at its axial middle part,
19. The method of upsetting a cylindrical material according to any one of the above items 14 to 18, wherein a mandrel half piece corresponding to each punch is connected in a state extending in the axial direction of the punch.

[20] Each punch has a corresponding mandrel half piece connected to each punch via an expansion / contraction device that can expand and contract in the axial direction.
20. The method for upsetting a cylindrical material as described in 19 above, wherein the telescopic device is shortened as each punch moves.

  [21] The cylindrical shape according to any one of items 14 to 20, wherein each of the planned processing portions of the material is bulged in a state where the portion corresponding to the tip of the guide in each of the planned processing portions of the material is locally heated. Material upsetting method.

  [22] The upsetting method for a tubular material according to the above item 21, wherein a portion corresponding to the leading end portion of the guide in each processing planned portion of the material is induction-heated locally by induction heating means.

  [23] The cylinder according to item 21 above, wherein the axially opposite ends of the constraining die are locally heated by induction heating means to locally heat the portion corresponding to the tip of the guide in each processing target portion of the material. Method of upsetting the material.

  [24] The upsetting method for a cylindrical material according to any one of the above items 21 to 23, wherein a portion corresponding to the tip portion of the guide in each planned processing portion of the material is locally heated to a semi-molten state.

  [25] The preceding items 21 to 21 in which each processing target portion of the material is bulged in a state where the portion corresponding to the base end portion of the processing target portion of the material is locally cooled by the cooling means. 25. The upsetting method according to any one of 24.

  [26] A cylindrical upsetting product obtained by the cylindrical material upsetting method according to any one of 14 to 25 above.

[27] preparing a mandrel having a mandrel body and a small diameter portion provided at an axial end of the mandrel body and having a smaller diameter than the mandrel body;
By disposing the mandrel main body in the hollow part of the non-scheduled part of the cylindrical material and the small-diameter part of the mandrel in the hollow part of the planed part, the inner peripheral surface of the non-scheduled part is the peripheral surface of the mandrel body. And forming a molding recess between the inner peripheral surface of the processing scheduled portion and the small diameter portion,
Further, by arranging the planned processing portion and the non-processing planned portion of the material in the constraining hole provided in the restraint die so as to extend in the axial direction, the outer peripheral surfaces of the processing planned portion and the non-processing planned portion of the constraining hole are arranged. While restraining on the circumference,
By placing a guide in the hollow part of the planned processing part of the material, the inner peripheral surface of the planned processing part is constrained by the peripheral surface of the guide,
Next, while pressing the planned processing portion of the material in the axial direction with a punch, the guide is moved in the direction opposite to the moving direction of the punch so that the thickness of the processing planned portion of the material is increased in the molding recess. A method for upsetting a cylindrical material, characterized by bulging inward.

  [28] The upsetting method for a tubular material as described in 27 above, wherein the guide is moved by the driving force of the guide driving device.

[29] The average moving speed from the start of punch movement is P,
G, the average moving speed from the start of guide movement
The buckling limit length in the cross-sectional area of the planned processing part of the material before upsetting is X ₀ ,
The initial clearance between the tip of the guide and the bottom of the molding recess is X (where 0 ≦ X ≦ X ₀ ),
The length of the material before upsetting necessary for the bulge is L ₀ ,
The stop position of the tip of the punch, which is obtained from the design volume of the bulge, with respect to the bottom of the molding recess is X _P ,
The stop position of the tip of the guide determined by design relative to the bottom of the molding recess is X _g ,
The time lag from the start of punch movement to the start of guide movement is t ₀ (where 0 ≦ t ₀ ),
Then G is
G = (X _g −X) P / (L ₀ −X _P −Pt ₀ )
29. A method for upsetting a cylindrical material as described in 27 or 28 above, which satisfies the following formula.

  [30] The upsetting method for a tubular material according to the above item 27, wherein the guide is moved by a pushing-back force acting on the guide by press-fitting the material into the forming recess of the material to be processed.

  [31] The upsetting method according to any one of items 27 to 30, wherein a tip end portion of the punch is formed in a cross-sectional shape corresponding to a cross-sectional shape of an axial end portion of the material.

  [32] The upsetting method for a cylindrical material according to any one of items 27 to 31, wherein the mandrel is connected to the guide in a state of extending in the axial direction of the guide.

[33] The mandrel is connected to the guide via an expansion / contraction device capable of expanding and contracting in the axial direction,
33. The upsetting method for a cylindrical material according to the item 32, wherein the expansion / contraction device is extended along with the movement of the guide.

  [34] The cylindrical material according to any one of items 27 to 33, wherein the planned processing portion of the material is bulged in a state in which the portion corresponding to the tip portion of the guide in the planned processing portion of the material is locally heated. Upsetting method.

  [35] The upsetting method for a tubular material according to the above item 34, wherein a portion of the material to be processed corresponding to the tip of the guide is locally induction-heated by induction heating means.

  [36] The cylindrical shape according to the above item 34, wherein the portion corresponding to the tip end portion of the guide in the planned processing portion of the material is locally heated by induction heating the axial end portion of the constraining die locally by the induction heating means. Material upsetting method.

  [37] The tubular material upsetting method according to any one of the above items 34 to 36, wherein a portion corresponding to the distal end portion of the guide in the planned processing portion of the material is locally heated to a semi-molten state.

  [38] In the above items 34 to 37, the portion to be processed of the material is bulged in a state where the portion corresponding to the portion on the base end side relative to the distal end portion of the guide in the portion to be processed of the material is locally cooled by the cooling means. The upsetting method of the cylindrical raw material of any one of Claims 1.

  [39] A cylindrical upsetting product obtained by the cylindrical material upsetting method according to any one of items 27 to 38.

[40] A cylindrical material upsetting apparatus for expanding the processing portion of the cylindrical material so that the wall thickness increases.
A mandrel disposed in the hollow portion of the planned processing portion and the non-processing planned portion of the tubular material;
A constraining die having a constraining hole extending in the axial direction, and a non-processed portion of the material disposed in the constraining hole;
A molding recess provided at the axial end of the constraining die; and
A guide having an insertion hole extending in the axial direction, and a processing planned portion of the material being disposed in the insertion hole;
A punch that pressurizes the planned processing part of the material in the axial direction;
With
An upsetting apparatus for a cylindrical material, wherein the guide is movable in a direction opposite to the moving direction of the punch.

  [41] The tubular material upsetting apparatus according to [40], further comprising a guide driving device that moves the guide in a direction opposite to the moving direction of the punch.

  [42] The tubular material upsetting apparatus as recited in the aforementioned Item 40 or 41, wherein the tip of the punch is formed in a cross-sectional shape corresponding to the cross-sectional shape of the axial end of the material.

  [43] The tubular material upsetting apparatus according to any one of the preceding items 40 to 42, wherein a mandrel is connected to the punch in a state of extending in the axial direction of the punch.

  [44] The upsetting apparatus for a cylindrical material as recited in the aforementioned Item 43, wherein the mandrel is connected to the punch via an expansion / contraction device capable of expanding and contracting in the axial direction.

  [45] The tubular material upsetting apparatus as recited in the aforementioned Item 44, wherein an expansion / contraction device is disposed inside the punch.

  [46] The upsetting apparatus for a cylindrical material according to the above item 44 or 45, wherein the expansion / contraction apparatus has a fluid pressure cylinder or an axially expandable / contracting spring.

  [47] The tubular material upsetting apparatus according to any one of [40] to [46], wherein a chamfering process is performed on an edge of the opening of the insertion hole at the tip of the guide.

  [48] The tubular material upsetting apparatus according to any one of [40] to [47], further including a heating unit that locally heats a portion of the material to be processed corresponding to the tip portion of the guide.

[49] The heating means is induction heating means,
49. The upsetting apparatus for a cylindrical material according to the preceding item 48, wherein a portion corresponding to the tip end portion of the guide in the material processing scheduled portion is configured to be induction heated locally by induction heating means.

[50] The heating means is induction heating means,
48. The preceding paragraph 48 configured to locally heat a portion corresponding to the leading end portion of the guide in the material processing scheduled portion by locally inductively heating the axial end portion of the constraining die by induction heating means. Cylindrical material upsetting machine.

  [51] The tubular material according to any one of [48] to [50], wherein the heating means is capable of locally heating a portion corresponding to the tip portion of the guide in the planned processing portion of the material into a semi-molten state. Upsetting machine.

  [52] The upsetting process as described in any one of 48 to 51 above, further including a cooling unit that locally cools a portion corresponding to a portion closer to the base end side than the distal end portion of the guide in the planned processing portion of the material. apparatus.

[53] A cylindrical material upsetting apparatus for expanding the planned processing portions on both sides in the axial direction of the cylindrical material so as to increase the thickness,
A mandrel disposed in a hollow portion of a non-scheduled portion of the axially intermediate portion of the cylindrical material and a planed portion of both side portions in the axial direction;
A constraining die having a constraining hole extending in the axial direction, and a non-processed portion of the material disposed in the constraining hole;
Two molding recesses provided at both axial ends of the constraining die;
Two guides each having an insertion hole extending in the axial direction, each of which is planned to be processed in the insertion hole,
Two punches that pressurize each planned processing portion of the material in the axial direction,
With
An upsetting apparatus for a cylindrical material, wherein each guide is movable in a direction opposite to the direction of movement of the corresponding punch.

  [54] The tubular material upsetting apparatus as recited in the aforementioned Item 53, comprising two guide driving devices for moving each guide in a direction opposite to the direction of movement of the corresponding punch.

  [55] The tubular material upsetting apparatus as recited in the aforementioned Item 53 or 54, wherein the tip of each punch is formed in a cross-sectional shape corresponding to a cross-sectional shape of a corresponding axial end of the material.

[56] The mandrel is divided into two at its axial middle part,
56. The upsetting apparatus for a cylindrical material according to any one of the preceding items 53 to 55, wherein a mandrel half piece corresponding to each punch is connected in a state extending in the axial direction of the punch.

  [57] The upsetting apparatus for a cylindrical material as recited in the aforementioned Item 56, wherein each of the corresponding half-barrels of the mandrel is connected to each punch via an expansion / contraction device capable of expanding and contracting in the axial direction.

  [58] The tubular material upsetting apparatus as recited in the aforementioned Item 57, wherein the corresponding expansion and contraction device is arranged inside each punch.

  [59] The upsetting apparatus for a cylindrical material according to the above item 57 or 58, wherein the expansion and contraction device has a fluid pressure cylinder or an axially expandable spring.

  [60] The tubular material upsetting apparatus according to any one of items 53 to 59, wherein a chamfering process is performed on an edge of the insertion hole at the tip of each guide.

  [61] The upsetting of the cylindrical material according to any one of the items 53 to 60, further comprising two heating means for locally heating a portion corresponding to the tip portion of the guide in each processing planned portion of the material. Processing equipment.

[62] Each heating means is induction heating means,
62. The upsetting apparatus for a cylindrical material according to the preceding item 61, which is configured so as to locally inductively heat a portion corresponding to the leading end portion of the guide in each planned processing portion of the material by induction heating means.

[63] Each heating means is induction heating means,
61. The structure according to the above item 61, wherein both ends in the axial direction of the constraining die are induction-heated locally by induction heating means to locally heat a portion corresponding to the tip of the guide in each processing target portion of the material. The tubular material upsetting apparatus described.

  [64] The cylindrical material according to any one of the above items 61 to 63, wherein each heating means is capable of locally heating a portion corresponding to the tip end portion of the guide in the planned processing portion of the material into a semi-molten state. Upsetting machine.

  [65] Any one of the preceding items 61 to 64, comprising two cooling means for locally cooling a portion corresponding to a portion closer to the base end side than the distal end portion of the guide in each processing planned portion of the material. Cylindrical material upsetting machine.

[66] A tubular material upsetting apparatus for expanding a processing portion of the cylindrical material inward so that the wall thickness increases.
The mandrel body and the mandrel body are provided at the axial end of the mandrel body and have a smaller diameter portion smaller than the mandrel body. A small diameter part is disposed in each part, and a mandrel that forms a molding recess between the inner peripheral surface of the non-processed scheduled part and the small diameter part,
A constraining die having a constraining hole extending in the axial direction and in which the planned processing part and the non-processing target part of the material are disposed;
A guide arranged in a hollow portion of a planned processing portion of the material,
A punch that pressurizes the planned processing part of the material in the axial direction;
With
An upsetting apparatus for a cylindrical material, wherein the guide is movable in a direction opposite to the moving direction of the punch.

  [67] The tubular material upsetting apparatus as recited in the aforementioned Item 66, further comprising a guide driving device that moves the guide in a direction opposite to the moving direction of the punch.

  [68] The tubular material upsetting apparatus as recited in the aforementioned Item 66 or 67, wherein the tip of the punch is formed in a cross-sectional shape corresponding to the cross-sectional shape of the axial end of the material.

  [69] The installation of the cylindrical material according to any one of the above items 66 to 68, wherein the guide is disposed so as to be movable in the axial direction of the punch in a hollow portion that extends in the axial direction inside the punch. Machining equipment.

  [70] The upsetting apparatus for a cylindrical material according to any one of the above items 66 to 69, wherein the mandrel is connected to the guide in a state of extending in the axial direction of the guide.

  [71] The tubular material upsetting apparatus as recited in the aforementioned Item 70, wherein the mandrel is connected to the guide via an expansion / contraction device capable of expanding and contracting in the axial direction.

  [72] The upsetting apparatus for a tubular material as recited in the aforementioned Item 71, wherein an expansion / contraction device is disposed inside the guide.

  [73] The upsetting apparatus for a cylindrical material as recited in the aforementioned Item 71 or 72, wherein the expansion / contraction device has a fluid pressure cylinder or a spring that can expand and contract in the axial direction.

  [74] The tubular material upsetting apparatus according to any one of items 66 to 73, wherein a chamfering process is performed on a peripheral edge portion of a distal end portion of the guide.

  [75] The tubular material upsetting apparatus according to any one of [66] to [74], further including a heating unit that locally heats a portion of the material to be processed corresponding to the tip of the guide.

[76] The heating means is induction heating means,
76. The upsetting apparatus for a cylindrical material according to 75 above, which is configured so as to locally induce and heat a portion corresponding to the distal end portion of the guide in the material processing scheduled portion by induction heating means.

[77] The heating means is induction heating means,
75. The above-described item 75, wherein the portion corresponding to the tip end portion of the guide in the material processing scheduled portion is locally heated by locally inductively heating the axial end portion of the constraining die by the induction heating means. Cylindrical material upsetting machine.

  [78] The cylindrical material according to any one of [75] to [77], wherein the heating means is capable of locally heating a portion corresponding to the tip portion of the guide in the planned processing portion of the material into a semi-molten state. Upsetting machine.

  [79] The cylindrical material according to any one of [75] to [78], further comprising a cooling unit that locally cools a portion corresponding to a portion closer to the base end side than the distal end portion of the guide in the planned processing portion of the material. Upsetting machine.

[80] By filling the hollow portion of the planned processing part and the non-processed part of the cylindrical material with pressure fluid, the inner peripheral surface of the planned process part and the non-processed part is pressurized and restrained with fluid pressure,
By constraining the non-scheduled part of the material in a restraint hole provided in the restraint die so as to extend in the axial direction thereof, the outer peripheral surface of the non-scheduled part is restrained by the peripheral surface of the restraint hole,
And while arranging the processing planned part of the material in the molding recess provided in the axial direction end of the constraining die,
Place the planned processing part of the material in the insertion hole provided in the guide in the axial direction,
Next, while pressing the planned processing portion of the material in the axial direction with a punch, the guide is moved in the direction opposite to the moving direction of the punch so that the thickness of the processing planned portion of the material is increased in the molding recess. A method for upsetting a cylindrical material, characterized by bulging outward.

  [81] The tubular material upsetting method as recited in the aforementioned Item 80, wherein the guide is moved by the driving force of the guide driving device.

[82] The average moving speed from the start of punch movement is P,
G, the average moving speed from the start of guide movement
The buckling limit length in the cross-sectional area of the planned processing part of the material before upsetting is X ₀ ,
The initial clearance between the tip of the guide and the bottom of the molding recess is X (where 0 ≦ X ≦ X ₀ ),
The length of the material before upsetting necessary for the bulge is L ₀ ,
The stop position of the tip of the punch, which is obtained from the design volume of the bulge, with respect to the bottom of the molding recess is X _P ,
The stop position of the tip of the guide determined by design relative to the bottom of the molding recess is X _g ,
The time lag from the start of punch movement to the start of guide movement is t ₀ (where 0 ≦ t ₀ ),
Then G is
G = (X _g −X) P / (L ₀ −X _P −Pt ₀ )
84. A method for upsetting a cylindrical material as described in 80 or 81 above, which satisfies the formula:

  [83] The tubular material upsetting method as recited in the aforementioned Item 80, wherein the guide is moved by a push-back force acting on the guide by press-fitting the material into the molding recess of the material to be processed.

  [84] The upsetting method for a cylindrical material according to any one of [80] to [83], wherein a front end portion of the punch is formed in a cross-sectional shape corresponding to a cross-sectional shape of an axial end portion of the material.

  [85] The cylindrical material according to any one of 80 to 84, wherein the material processing scheduled portion is bulged in a state in which the portion corresponding to the distal end portion of the guide in the material processing scheduled portion is locally heated. Upsetting method.

  [86] The upsetting method for a tubular material as recited in the aforementioned Item 85, wherein a portion of the material to be processed corresponding to the guide tip is locally induction-heated by induction heating means.

  [87] The cylindrical shape according to item 85, wherein a portion corresponding to the tip end portion of the guide in the processing target portion of the material is locally heated by induction heating the axial end portion of the constraining die locally by induction heating means. Material upsetting method.

  [88] The upsetting method according to any one of the above items 85 to 87, wherein a portion corresponding to the tip portion of the guide in the processing portion of the material is locally heated to a semi-molten state.

[89] In the above item 85 to bulge the planned processing portion of the material in a state where the portion corresponding to the base end portion of the planned processing portion of the material is locally cooled by the cooling means.
88. The upsetting method according to any one of 88.

  [90] A cylindrical upsetting product obtained by the cylindrical material upsetting method according to any one of 80 to 89.

[91] Filling the hollow portion of the non-scheduled portion of the axially intermediate portion of the cylindrical material and the planed portions of both sides in the axial direction with the pressure fluid, thereby the inner periphery of the non-scheduled portion and both the scheduled portions While restraining the surface with fluid pressure,
By constraining the non-scheduled part of the material in a restraint hole provided in the restraint die so as to extend in the axial direction thereof, the outer peripheral surface of the non-scheduled part is restrained by the peripheral surface of the restraint hole,
And both the planned processing parts of the material are arranged in the molding recesses provided at both ends in the axial direction of the constraint die,
Each processing planned portion of the material is arranged in an insertion hole provided in the guide so as to extend in the axial direction,
Next, while simultaneously pressing each planned processing portion of the material in the axial direction with a punch, each guide is moved in a direction opposite to the corresponding moving direction of the punch, thereby corresponding to each processing planned portion of the material. A method for upsetting a cylindrical material, characterized by bulging outward so that the thickness increases in a molding recess.

  [92] The tubular material upsetting method as recited in the aforementioned Item 91, wherein each guide is moved by a driving force of a corresponding guide driving device.

[93] In at least one of the two guides and a punch corresponding to the guide,
The average moving speed from the start of punch movement is P,
G, the average moving speed from the start of guide movement
The buckling limit length in the cross-sectional area of the planned processing part of the material before upsetting is X ₀ ,
The initial clearance between the tip of the guide and the bottom of the molding recess is X (where 0 ≦ X ≦ X ₀ ),
The length of the material before upsetting necessary for the bulge is L ₀ ,
The stop position of the tip of the punch obtained from the design volume of the bulge with respect to the bottom of the molding recess is X _P
The stop position of the tip of the guide determined by design relative to the bottom of the molding recess is X _g ,
The time lag from the start of punch movement to the start of guide movement is t ₀ (where 0 ≦ t ₀ ),
Then G is
G = (X _g −X) P / (L ₀ −X _P −Pt ₀ )
93. A method for upsetting a cylindrical material according to the item 91 or 92, which satisfies the formula:

  [94] The tubular material upsetting method according to [91], wherein each guide is moved by a pushing-back force acting on the guide by press-fitting the material of the material to be processed corresponding to the material into the molding recess.

  [95] The upsetting method according to any one of the above items 91 to 94, wherein a front end portion of each punch is formed in a cross-sectional shape corresponding to a cross-sectional shape of a corresponding axial end portion of the material.

  [96] The cylindrical shape according to any one of items 91 to 95, wherein each of the planned processing portions of the material is expanded in a state where the portion corresponding to the distal end portion of the guide in each of the planned processing portions of the material is locally heated. Material upsetting method.

  [97] The upsetting method for a tubular material as recited in the aforementioned Item 96, wherein the portion corresponding to the tip end portion of the guide in each planned processing portion of the material is locally induction heated by induction heating means.

  [98] The cylinder according to item 96, wherein the axially opposite ends of the constraining die are locally heated by induction heating means to locally heat a portion corresponding to the tip of the guide in each processing target portion of the material. Method of upsetting the material.

  [99] The upsetting method for a tubular material according to any one of the above items 96 to 98, wherein a portion corresponding to the distal end portion of the guide in each processing scheduled portion of the material is locally heated to a semi-molten state.

  [100] The preceding paragraphs 96 to 96 in which each processing target portion of the material is expanded in a state where the portion corresponding to the base end portion of the processing target portion of the material is locally cooled by the cooling means. 99. The upsetting method according to any one of 99.

  [101] A cylindrical upsetting product obtained by the cylindrical material upsetting method according to any one of 91 to 100.

[102] A cylindrical material upsetting apparatus that bulges the processing portion of the cylindrical material outward so that the thickness increases.
A pressure fluid filling means for filling a pressure fluid into a hollow portion of a scheduled processing portion and a non-processing scheduled portion of the tubular material;
A constraining die having a constraining hole extending in the axial direction, and a non-processed portion of the material disposed in the constraining hole;
A molding recess provided at the axial end of the constraining die; and
A guide having an insertion hole extending in the axial direction, and a processing planned portion of the material being disposed in the insertion hole;
A punch that pressurizes the planned processing part of the material in the axial direction;
With
An upsetting apparatus for a cylindrical material, wherein the guide is movable in a direction opposite to the moving direction of the punch.

  [103] The tubular material upsetting apparatus according to [102], further including a guide driving device that moves the guide in a direction opposite to the moving direction of the punch.

  [104] The tubular material upsetting apparatus according to [102] or [103], wherein a tip end portion of the punch is formed in a cross-sectional shape corresponding to a cross-sectional shape of an axial end portion of the material.

  [105] The tubular material upsetting apparatus according to any one of the above-mentioned items 102 to 104, wherein a chamfering process is applied to an edge of the opening of the insertion hole at the tip of the guide.

  [106] The tubular material upsetting apparatus according to any one of [102] to [105], further including a heating unit that locally heats a portion of the material to be processed corresponding to the tip of the guide.

[107] The heating means is induction heating means,
107. The tubular material upsetting apparatus according to item 106, wherein a portion of the material to be processed corresponding to the tip of the guide is locally heated by induction heating means.

[108] The heating means is induction heating means,
106. The preceding paragraph 106 configured to locally heat a portion corresponding to the leading end portion of the guide in the material processing scheduled portion by locally inductively heating the axial end portion of the constraining die by induction heating means. Cylindrical material upsetting machine.

  [109] The cylindrical material according to any one of the above items 106 to 108, wherein the heating means is capable of locally heating a portion corresponding to the distal end portion of the guide in the planned processing portion of the material into a semi-molten state. Upsetting machine.

  [110] The upsetting process according to any one of the above items 106 to 109, further comprising a cooling means for locally cooling a portion corresponding to a portion closer to the base end side than the distal end portion of the guide in the planned processing portion of the material. apparatus.

[111] An upsetting apparatus for a cylindrical material that bulges the planned processing portions on both sides in the axial direction of the cylindrical material so as to increase the thickness,
A pressure fluid filling means for filling a pressure fluid into a hollow portion of a non-scheduled scheduled portion in the axial intermediate portion of the cylindrical material and a planned planned portion on both axial side portions;
A constraining die having a constraining hole extending in the axial direction, and a non-processed portion of the material disposed in the constraining hole;
Two molding recesses provided at both axial ends of the constraining die;
Two guides each having an insertion hole extending in the axial direction, each of which is planned to be processed in the insertion hole,
Two punches that pressurize each planned processing portion of the material in the axial direction,
With
An upsetting apparatus for a cylindrical material, wherein each guide is movable in a direction opposite to the direction of movement of the corresponding punch.

  [112] The upsetting apparatus for a cylindrical material as recited in the aforementioned Item 111, comprising two guide driving devices for moving each guide in a direction opposite to the direction of movement of the corresponding punch.

  [113] The tubular material upsetting apparatus according to 111 or 112, wherein the tip of each punch is formed in a cross-sectional shape corresponding to a cross-sectional shape of a corresponding axial end of the material.

  [114] The upsetting apparatus for a cylindrical material according to any one of the above items 111 to 113, wherein a chamfering process is performed on an edge of the opening of the insertion hole at the tip of each guide.

  [115] Upsetting of the cylindrical material according to any one of the above-mentioned items 111 to 114, comprising two heating means for locally heating a portion corresponding to the tip end portion of the guide in each planned processing portion of the material. Processing equipment.

[116] Each heating means is an induction heating means,
116. The upsetting apparatus for a cylindrical material according to the preceding item 115, which is configured to locally induction-heat a portion corresponding to the tip of the guide in each processing scheduled portion of the material by induction heating means.

[117] Each heating means is an induction heating means,
115. The above-described item 115 is configured to locally heat the portions corresponding to the distal end portion of the guide in each processing target portion of the material by locally inductively heating both axial ends of the constraining die by induction heating means. The tubular material upsetting apparatus described.

  [118] The cylindrical material according to any one of the above items 115 to 117, wherein each heating means is capable of locally heating a portion corresponding to the tip of the guide in the planned processing portion of the material into a semi-molten state. Upsetting machine.

  [119] Any one of the preceding paragraphs 115 to 118, comprising two cooling means for locally cooling a portion corresponding to a portion closer to the base end side than the distal end portion of the guide in each processing planned portion of the material. Cylindrical material upsetting machine.

  The present invention has the following effects.

  In the invention of [1], when pressurizing the material processing scheduled portion with a punch, the inner peripheral surfaces of the material processing scheduled portion and the non-processing scheduled portion are constrained by the peripheral surface of the mandrel, and the non-processing scheduled portion Since the outer peripheral surface of the material is constrained by the peripheral surface of the constraining hole of the constraining die, buckling to the inside and outside of the non-processed portion of the material is prevented, and buckling to the inside of the processing portion is prevented. ing. In addition, since the planned machining part of the material is arranged in the insertion hole of the guide, the outer peripheral surface of the planned machining part is constrained by the circumferential surface of the insertion hole, thereby preventing buckling of the planned machining part to the outside. Has been. In this state, the guide is moved in the direction opposite to the moving direction of the punch while pressing the planned processing portion of the material in the axial direction with the punch, so that it is exposed between the tip of the guide and the bottom of the molding recess. The planned processing portion of the material swells reliably and satisfactorily outwardly so that the thickness increases in the molding recess. As a result, a high-quality cylindrical upsetting product can be obtained.

  In the invention [2], the guide can be moved reliably.

  In the invention of [3], the planned processing portion of the material can be reliably formed in the designed shape.

  In the invention of [4], the guide can be moved without necessarily using the guide driving device, so that the upsetting apparatus can be simplified.

  In the invention of [5], it is possible to reliably press the planned processing portion of the material with a punch.

  In the invention of [6], the mandrel is arranged in the hollow part of the material planned processing part and the non-processed part, and the punch is used for pressurizing the material processing target part with the punch. It is possible to simultaneously perform the punch setting work arranged on the end portion in the axial direction, thereby improving the work efficiency of the upsetting process.

  Further, after the processing is finished, the mandrel is extracted from the hollow portion of the planned processing portion and the non-processing target portion of the material, and the mandrel is extracted, and the punch is removed from the position of the axial end of the material. The removal work can be performed at the same time, so that the work efficiency of upsetting can be further improved.

  In the invention of [7], it is possible to reliably prevent a problem that the position of the mandrel shifts with the movement of the punch or the bulge of the planned processing portion of the material.

  In the invention of [8], the deformation resistance is locally reduced only in a portion corresponding to the tip end portion of the guide among the material processing scheduled portions. Therefore, the molding pressure can be reduced.

  On the other hand, since the portion corresponding to the portion closer to the base end than the tip end portion of the guide among the planned processing portions of the material is not heated, the deformation resistance does not decrease. Therefore, it is possible to prevent an increase in molding pressure caused by the end portion of the material being crushed in the insertion hole of the guide by the pressure applied from the punch.

  In the invention of [9], it is possible to reliably and extremely efficiently heat the portion corresponding to the tip end portion of the guide in the material processing scheduled portion.

  In the invention of [10], the portion corresponding to the tip end portion of the guide in the material processing scheduled portion can be reliably and efficiently heated.

  In the invention of [11], the molding pressure can be greatly reduced.

  In the invention of [12], it is possible to reliably suppress the portion corresponding to the portion closer to the base end side than the distal end portion of the guide in the processing target portion of the material, and to thereby reduce the deformation resistance at the portion of the material. Can be reliably suppressed.

  In the invention of [13], it is possible to provide a high-quality cylindrical upsetting product in which a bulging portion bulging outward is formed so as to increase the thickness at a predetermined portion in the axial direction.

  In the invention of [14], it is possible to efficiently manufacture a cylindrical upsetting product in which a bulging portion bulging outward is formed so as to increase the thickness on both side portions in the axial direction.

  In the invention of [15], each guide can be moved reliably.

  In the invention of [16], the planned processing portion of the material can be reliably formed in the designed shape.

  In the invention of [17], each guide can be moved without necessarily using the guide driving device, and thus the upsetting apparatus can be simplified.

  In the invention of [18], each processing scheduled portion of the material can be reliably pressurized with a punch.

  [19] In the invention of [19], each mandrel half piece is disposed in the hollow portion of the material planned to be processed portion and the non-processed scheduled portion, and the mandrel half piece portion setting operation and each punch corresponding to the material to be processed It is possible to simultaneously perform the punch setting operation in which each punch is arranged on the axial end side of the material for pressurization, thereby improving the work efficiency of the upsetting process.

  Furthermore, after the processing is finished, each mandrel half piece is extracted from the hollow portion of the material planned processing portion and the non-processing planned portion, and the mandrel half piece extracting operation and each punch in the axial end portion of the material It is possible to simultaneously remove the punch and remove the punch, thereby further improving the efficiency of the upsetting process.

  Furthermore, since the length of the mandrel is divided into two at the axial middle portion, the length of the mandrel is shortened, so that the insertion time of the mandrel into the predetermined hollow portion can be shortened, and the upsetting work The efficiency can be further improved.

  In the invention of [20], it is possible to reliably prevent a problem that the position of the half piece of the mandrel shifts with the movement of the punch or the bulging of the planned processing portion of the material.

  In the invention [21], the molding pressure can be reduced for the same reason as in the invention [8].

  In the invention of [22], the portion corresponding to the tip end portion of the guide in each planned processing portion of the material can be reliably and extremely efficiently heated.

  In the invention of [23], the portion corresponding to the tip end portion of the guide in each processing planned portion of the material can be reliably and efficiently heated.

  In the invention of [24], the molding pressure can be greatly reduced.

  In the invention of [25], it is possible to reliably suppress the heating of the portion corresponding to the portion on the base end side relative to the tip end portion of the guide in each processing planned portion of the material, and thus the deformation resistance in each portion of the material. Can be reliably suppressed.

  In the invention [26], it is possible to provide a high-quality cylindrical upsetting product in which bulging portions bulging outward are formed on both side portions in the axial direction so as to increase the thickness.

  In the invention of [27], when pressurizing the planned processing portion of the material with a punch, the inner peripheral surface of the non-processed portion of the material is constrained by the peripheral surface of the mandrel body, and the planned processing portion and the non-processed portion Since the outer peripheral surface of the part is restrained by the peripheral surface of the restraint hole of the restraining die, the buckling of the material to the inside and the outside of the non-working scheduled part is prevented, and the buckling to the outside of the working planned part is prevented. Is done. In addition, by arranging the guide in the hollow part of the planned processing part of the material, the inner peripheral surface of the planned processing part is restrained by the peripheral surface of the guide, and this prevents buckling of the planned processing part inside. Yes. In this state, the guide is moved in the direction opposite to the moving direction of the punch while pressing the planned processing portion of the material in the axial direction with the punch, so that it is exposed between the tip of the guide and the bottom of the molding recess. The planned processing portion of the material swells reliably and satisfactorily inward so that the thickness increases in the molding recess. As a result, a high-quality cylindrical upsetting product can be obtained.

  In the invention [28], the guide can be moved reliably.

  In the invention of [29], the planned processing portion of the material can be reliably formed in the designed shape.

  In the invention [30], the guide can be moved without necessarily using the guide driving device, and the upsetting apparatus can be simplified.

  In the invention of [31], it is possible to reliably pressurize the planned pressurizing portion of the material with a punch.

  In the invention of [32], the mandrel main body is arranged in the hollow part of the non-scheduled part of the material, and the small diameter part is arranged in the hollow part of the planed part of the material, and the guide is used for the part of the material to be worked. The guide setting operation arranged in the hollow portion can be performed at the same time, so that the work efficiency of upsetting can be improved.

  In the invention of [33], it is possible to reliably prevent a problem that the position of the mandrel shifts with the movement of the guide or the bulging of the planned processing portion of the material.

  In the invention [34], the molding pressure can be reduced for the same reason as in the invention [8].

  In the invention [35], the part corresponding to the tip end portion of the guide in the material processing scheduled portion can be reliably and extremely efficiently heated.

  In the invention of [36], the portion corresponding to the tip end portion of the guide in the material processing scheduled portion can be reliably and efficiently heated.

  In the invention of [37], the molding pressure can be greatly reduced.

  In the invention of [38], it is possible to surely suppress the portion corresponding to the portion closer to the base end side than the distal end portion of the guide in the processing target portion of the material, thereby reducing the deformation resistance at the portion of the material. Can be reliably suppressed.

  In the invention [39], it is possible to provide a high-quality cylindrical upsetting product in which a bulging portion bulging inward is formed so as to increase the thickness at a predetermined portion in the axial direction.

  In the inventions [40] to [52], a cylindrical material upsetting apparatus that can be suitably used in the cylindrical material upsetting method according to any one of the above [1] to [12]. Can be provided.

  In the inventions [53] to [65], a cylindrical material upsetting apparatus that can be suitably used in the cylindrical material upsetting method according to any one of the above [14] to [25]. Can be provided.

  In the inventions [66] to [79], a tubular material upsetting apparatus that can be suitably used in the tubular material upsetting method according to any one of the above [27] to [38]. Can be provided.

  In the invention of [80], when pressurizing the material processing scheduled portion with a punch, the inner peripheral surfaces of the material processing scheduled portion and the non-processing scheduled portion are pressurized and restrained by fluid pressure, and the non-processing scheduled portion Since the outer peripheral surface is constrained by the peripheral surface of the restraint hole of the restraint die, buckling of the material to the inside and outside of the non-processed scheduled part is prevented, and buckling to the inside of the planned process part is prevented. Yes. In addition, since the planned machining part of the material is arranged in the insertion hole of the guide, the outer peripheral surface of the planned machining part is constrained by the circumferential surface of the insertion hole, thereby preventing buckling of the planned machining part to the outside. Has been. In this state, the guide is moved in the direction opposite to the moving direction of the punch while pressing the planned processing portion of the material in the axial direction with the punch, so that it is exposed between the tip of the guide and the bottom of the molding recess. The planned processing portion of the material swells reliably and satisfactorily outwardly so that the thickness increases in the molding recess. As a result, a high-quality cylindrical upsetting product can be obtained.

  Furthermore, since the non-processed part of the material and the hollow part of the process-scheduled part are filled with the pressure fluid instead of the mandrel, the frictional force acting on the material-scheduled part during processing can be reduced. Therefore, the molding pressure can be greatly reduced. Furthermore, there is an advantage that it is not necessary to extract the mandrel from the hollow portion of the upsetting product after the processing is completed.

  In the invention [81], the guide can be moved reliably.

  In the invention of [82], the planned processing portion of the material can be reliably formed into the designed shape.

  [83] In the invention of [83], the guide can be moved without necessarily using the guide driving device, so that the upsetting apparatus can be simplified.

  In the invention of [84], the planned processing portion of the material can be reliably pressurized with a punch.

  In the invention of [85], the deformation resistance is locally reduced only in a portion corresponding to the distal end portion of the guide among the planned processing portion of the material. Therefore, the molding pressure can be further reduced.

  On the other hand, since the portion corresponding to the portion closer to the base end than the tip end portion of the guide among the planned processing portions of the material is not heated, the deformation resistance does not decrease. Therefore, it is possible to prevent a problem that the end portion of the material is crushed by the pressurizing force from the punch to cause a shape defect.

  In the invention of [86], it is possible to reliably and extremely efficiently heat the portion corresponding to the tip end portion of the guide in the material processing scheduled portion.

  In the invention of [87], it is possible to reliably and efficiently heat the portion corresponding to the tip end portion of the guide in the material processing scheduled portion.

  In the invention of [88], the molding pressure can be greatly reduced.

  In the invention of [89], it is possible to surely suppress the portion corresponding to the portion closer to the base end side than the distal end portion of the guide in the processing target portion of the material, thereby reducing the deformation resistance at the portion of the material. Can be reliably suppressed.

  According to the invention of [90], it is possible to provide a high-quality cylindrical upsetting product in which a bulging portion bulging outward is formed so as to increase the thickness at a predetermined portion in the axial direction.

  In the invention of [91], it is possible to efficiently manufacture a cylindrical upsetting product in which a bulging portion bulging outward is formed so as to increase the thickness on both side portions in the axial direction.

  In the invention [92], each guide can be moved reliably.

  In the invention of [93], the planned processing portion of the material can be surely formed into the designed shape.

  [94] In the invention of [94], each guide can be moved without necessarily using a guide driving device, and thus the upsetting apparatus can be simplified.

  In the invention of [95], each processing scheduled portion of the material can be reliably pressurized with a punch.

  In the invention of [96], the molding pressure can be further reduced for the same reason as in the invention of [85] above, and the problem that the end of the material is crushed by the pressurizing force from the punch to cause a defective shape is prevented. it can.

  In the invention of [97], the portion corresponding to the tip end portion of the guide in each processing portion of the material can be reliably and extremely efficiently heated.

  In the invention of [98], the portion corresponding to the tip end portion of the guide in each planned processing portion of the material can be reliably and efficiently heated.

  In the invention of [99], the molding pressure can be greatly reduced.

  In the invention of [100], it is possible to surely suppress the heating of the portion corresponding to the portion on the base end side relative to the tip end portion of the guide in each processing planned portion of the material, and thus the deformation resistance in each portion of the material. Can be reliably suppressed.

  In the invention of [101], it is possible to provide a high-quality cylindrical upsetting product in which bulged portions bulging outward are formed on both side portions in the axial direction so as to increase the thickness.

  In the inventions [102] to [110], there is provided a tubular material upsetting apparatus that can be suitably used in the tubular material upsetting method according to any one of the above [80] to [89]. Can be provided.

  In the inventions [111] to [119], a tubular material upsetting apparatus that can be suitably used in the tubular material upsetting method according to any one of the above [91] to [100]. Can be provided.

It is a schematic longitudinal cross-sectional perspective view of the principal part of the upsetting apparatus which concerns on 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the upsetting apparatus in the state in the middle of setting the mandrel and punch of the upsetting apparatus to a predetermined position. It is a longitudinal cross-sectional view of the upsetting apparatus in the state before processing the planned processing portion of the material by the upsetting apparatus. It is a longitudinal cross-sectional view of the upsetting apparatus in the state in the middle of processing the process planned part of a raw material with the upsetting apparatus. It is a longitudinal cross-sectional view of the upsetting apparatus in the state after processing the planned processing portion of the material by the upsetting apparatus. It is a perspective view of the upsetting product obtained by the upsetting apparatus. It is a schematic cross-sectional perspective view of the principal part of the upsetting apparatus which concerns on 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the upsetting apparatus in the state before processing the planned processing portion of the material by the upsetting apparatus. It is a longitudinal cross-sectional view of the upsetting apparatus in the state in the middle of processing the process planned part of a raw material with the upsetting apparatus. It is a longitudinal cross-sectional view of the upsetting apparatus in the state after processing the planned processing portion of the material by the upsetting apparatus. It is a perspective view of the upsetting product obtained by the upsetting apparatus. It is a longitudinal cross-sectional view of the upsetting apparatus in the state before processing the planned processing portion of the material by the upsetting apparatus according to the third embodiment of the present invention. It is a longitudinal cross-sectional view of the upsetting apparatus in the state in the middle of processing the process planned part of a raw material with the upsetting apparatus. It is a longitudinal cross-sectional view of the upsetting apparatus in the state after processing the planned processing portion of the material by the upsetting apparatus. It is a longitudinal cross-sectional view of the upsetting apparatus which shows the modification of the upsetting apparatus of the said 1st Embodiment. It is a longitudinal cross-sectional view of the upsetting apparatus which shows another modification of the upsetting apparatus of the said 3rd Embodiment. It is a longitudinal cross-sectional view of the upsetting apparatus in the state before processing the planned processing portion of the material by the upsetting apparatus according to the fourth embodiment of the present invention. It is a longitudinal cross-sectional view of the upsetting apparatus in the state in the middle of processing the process planned part of a raw material with the upsetting apparatus. It is a longitudinal cross-sectional view of the upsetting apparatus in the state after processing the planned processing portion of the material by the upsetting apparatus. It is a longitudinal cross-sectional view of the upsetting apparatus in the state before processing the planned processing portion of the material by the upsetting apparatus according to the fifth embodiment of the present invention. It is a longitudinal cross-sectional view of the upsetting apparatus in the state in the middle of processing the process planned part of a raw material with the upsetting apparatus. It is a longitudinal cross-sectional view of the upsetting apparatus in the state after processing the planned processing portion of the material by the upsetting apparatus. It is a longitudinal cross-sectional view of the upsetting apparatus in a state before processing the planned processing portion of the material by the upsetting apparatus according to the sixth embodiment of the present invention. It is a longitudinal cross-sectional view of the upsetting apparatus in the state in the middle of processing the process planned part of a raw material with the upsetting apparatus. It is a longitudinal cross-sectional view of the upsetting apparatus in the state after processing the planned processing portion of the material by the upsetting apparatus.

Explanation of symbols

1A, 1B, 1C ... Upsetting machine 1 ... Material 2 ... Planned part
2a ... Hollow part 3 ... Non-processed part
3a ... hollow part 4 ... bulging part 5 ... shaft part
6A, 6B, 6C ... Upset products
10 ... restraint die
11 ... Restraining hole
12 ... Molding recess
12a… Bottom
20 ... Guide
20a… tip
21 ... insertion hole
21a… Chamfered part
25 ... Guide moving direction
30 ... Punch
35 ... Punch movement direction
40 ...
40a… Half piece
41… Body body
42 ... Small diameter part
50 ... telescopic device
51… Hydraulic cylinder
52 ... Spring
60 ... Guide drive
70 ... Punch drive device
80 ... heating means
81 ... Induction heating means
81a… Induction heating coil
85 ... Cooling means
85a ... Coolant flow path
90 ... Pressure fluid filling means
91… Pressure fluid supply passage
92… Pressure fluid supply section
95 ... Pressure fluid

  Next, several embodiments of the present invention will be described below with reference to the drawings.

  FIGS. 1-6 is the schematic for demonstrating the upsetting method using the upsetting apparatus of the cylindrical raw material which concerns on 1st Embodiment of this invention.

  In FIG. 1, (1A) is an upsetting apparatus according to the first embodiment, and (1) is a cylindrical material. In FIG. 6, (6A) is a cylindrical upsetting product manufactured by the upsetting apparatus (1A). This upsetting product (6A) is a preform for producing a part of a cylindrical collar member to be mounted at the center of a bush (for example, an anti-vibration bush) for a vehicle such as an automobile or a railway vehicle. As a preform for manufacturing a part of a shaft member of a vehicle arm, or as a preform for manufacturing a member provided with a screw hole at an end of a cylindrical shaft portion. . (5) is the shaft portion of the upsetting product (6A) made of the non-processed portion (3) of the material (1), and (4) is the bulging portion formed at the end of the shaft portion (5). It is. The bulging portion (4) bulges so that the thickness increases outside the material (1) (that is, radially outward of the material (1)).

  As shown in FIGS. 1 and 2, the material (1) has a straight cylindrical shape, and more specifically, a straight round pipe shape, for example, aluminum (including its alloy, the same applies hereinafter). Become. The cross-sectional shape of the material (1) is annular, and the inner diameter, outer diameter, and thickness of the material (1) are all set to be constant in the axial direction. The material (1) is made of, for example, an extruded material.

  In the present invention, the material of the material (1) is not limited to aluminum, and may be, for example, a metal such as brass, copper, stainless steel, or plastic.

  The planned processing portion (2) of the material (1) is located on one side of both sides in the axial direction of the material (1), and more specifically, located on one axial end of the material (1). That is, one end portion in the axial direction of the material (1) corresponds to the planned processing portion (2). On the other hand, the non-processed portion (3) of the material (1) is located at the other axial end of the material (1), that is, the other end of the material (1) in the axial direction is the non-processed portion ( It corresponds to 3). Then, when the planned processing portion (2) of the material (1) is thickened to the design shape, as shown in FIG. 5, the thickness of the end portion of the material (1) (shaft portion (5)) is increased. A bulging portion (4) bulging outward is formed so as to increase.

  The upsetting apparatus (1A) is for bulging the planned processing part (2) of the material (1) outward so that the thickness increases. The upsetting apparatus (1A) includes a mandrel (40), a constraining die (10), a molding recess (12), a guide (20), a punch (30), and a guide driving device (60). And a punch driving device (70).

  The mandrel (40) is a straight rod having a circular cross section, and is formed in the hollow portion (2a) (3a) of the planned processing portion (2) of the material (1) and the non-processing planned portion (3). Inserted and arranged, the inner peripheral surfaces of the planned processing portion (2) and the non-processing planned portion (3) are restrained in a buckling-prevented state by the peripheral surface of the mandrel (40). The diameter of the mandrel (40) is set constant in the axial direction.

  The constraining die (10) has a constraining hole (11) having a circular cross section extending in the axial direction thereof. A non-scheduled portion (3) of the material (1) is inserted into the restraint hole (11), and the outer peripheral surface of the non-scheduled portion (3) is prevented from buckling by the peripheral surface of the restraint hole (11). It is supposed to be restrained.

  (15) is the bottom of the constraining die (10). This bottom (15) should be removed so that the unprocessed portion (3) of the material (1) placed in the restraining hole (11) does not unintentionally pull out from the opening at the bottom of the restraining hole (11). For closing, it is arranged at the bottom of the constraining die (10).

  Further, the constraining die (10) is vertically divided into a plurality of pieces (for example, two pieces), that is, a split die.

  As shown in FIG. 2, the molding recess (12) is provided continuously to the restraining hole (11) at one axial end of the restraining die (10). That is, this shaping | molding recessed part (12) is formed by providing an annular recess in the surrounding surface of the axial direction one end part of the restraint hole (11) of restraint die (10).

  The guide (20) has an insertion hole (21) having a circular cross section extending in the axial direction thereof. In the insertion hole (21), the planned processing portion (2) of the material (1) is inserted and disposed, and the planned processing portion (2) is movable in the axial direction in the insertion hole (21) and is prevented from buckling. It is supposed to hold on. The insertion hole (21) is provided through the guide (20) in the axial direction.

  The guide (20) is movable in the direction (25) opposite to the punch moving direction (35) (see FIG. 4).

  Further, the edge of the insertion hole (21) at the tip (20a) of the guide (20) is chamfered, so that the cross-sectional shape of the edge is rounded. (21a) is a chamfered portion formed on the edge.

  The punch (30) is for pressing the planned processing portion (2) of the material (1) in the axial direction. The tip of the punch (30) has a cross-sectional shape corresponding to the cross-sectional shape of the axial end of the material (1) (that is, the planned processing portion (2)), that is, the tip of the punch (30). The cross-sectional shape is an annular shape.

  Further, a hollow portion extending in the axial direction is formed inside the punch (30), and an expansion / contraction device (50) capable of expanding and contracting in the axial direction is disposed in the hollow portion. As shown in FIG. 2, the mandrel (40) is connected to the punch (30) via the telescopic device (50) so as to extend in the axial direction of the punch (30).

  In this embodiment, the telescopic device (50) includes a fluid pressure cylinder (51) that operates with fluid pressure such as oil pressure or gas pressure. A mandrel (40) is fixed to the tip of the telescopic rod (51a) of the fluid pressure cylinder (51).

  The punch driving device (70) moves the punch (30) in the axial direction of the material (1), and applies a pressing force to the punch (30) to press the planned processing portion (2) of the material (1). Is to do. The punch driving device (70) is connected to the punch (30), and applies a driving force to the punch (30) by fluid pressure (hydraulic pressure, gas pressure) or the like. In addition, since this punch drive device (70) can keep the punch speed constant once the target shape (design shape) is determined, no device for controlling the speed is required. By providing a control device for controlling the speed, it is possible to arbitrarily change the upset shape (the shape of the bulging portion).

  The guide driving device (60) moves the guide (20) in the direction (25) opposite to the punch moving direction (35) (that is, the pressing direction to the material processing scheduled portion (2) by the punch (30)). (See FIG. 4). The guide driving device (60) is connected to the guide (20), and applies a driving force to the guide (20) by fluid pressure (hydraulic pressure, gas pressure), an electric motor, a spring or the like. In addition, since the guide drive device (60) can make the movement of the guide constant when the target shape (design shape) is determined, a device for controlling the speed is not necessary. It is also possible to arbitrarily change the upset shape (the shape of the bulging portion) by providing a control device to be controlled.

  Next, an upsetting method using the upsetting apparatus (1A) of the first embodiment will be described below.

  First, as shown in FIG. 2, the non-processed portion (3) of the material (1) is inserted and disposed in the restraining hole (11) of the restraining die (10). Thereby, the process planned part (2) of the raw material (1) is arranged in the molding recessed part (12) of the constraining die (10). In this state, the outer peripheral surface of the non-processed portion (3) of the material (1) is constrained by the peripheral surface of the constraining hole (11).

  Next, the mandrel (40) is to be processed into the material (1) while the mandrel (40) is connected to the punch (30) via the fluid pressure cylinder (51) as the expansion device (50). Inserting and placing in the hollow portions (2a) and (3a) of the portion (2) and the non-processed portion (3) [set operation of the mandrel (40)]. By this operation, as shown in FIGS. 1 and 3, the punch (30) is arranged at the initial position on the axial end side of the material (1) [setting operation of the punch (30)]. In this state, the inner peripheral surfaces of the planned processing portion (2) and the non-processing planned portion (3) of the material (1) are constrained by the peripheral surface of the mandrel (40).

  Further, the processing planned portion (2) of the material (1) is inserted and arranged in the insertion hole (21) of the guide (20). Thereby, the outer peripheral surface of the processing scheduled part (2) of the material (1) is restrained by the peripheral surface of the insertion hole (21) of the guide (20).

Further, as shown in FIG. 3, an initial clearance X is provided between the tip (20a) of the guide (20) and the bottom (12a) of the molding recess (12). The interval of the initial clearance X is such that the tip (20a) of the guide (20) is in a state before the movement of the punch (30) (that is, pressurization of the punch (30) to the material processing scheduled portion (2)) is started. ) And the bottom part (12a) of the molding recess (12), the buckling limit length (X ₀ ) or less (preferably in the cross-sectional area of the exposed part (2) of the material (1) to be processed) (preferably The buckling limit length (less than X ₀ ) is set. In the present invention, the buckling limit length refers to the buckling limit length in the punch pressing force.

  Next, as shown in FIG. 4, the punch drive device (70) is operated to move the punch (30), and the processing target portion (2) of the material (1) is pressed in the axial direction by the punch (30). However, by operating the guide driving device (60), the guide (20) is moved in the direction (25) opposite to the moving direction (35) of the punch. As a result, the processing target portion (2) of the material (1) exposed between the tip portion (20a) of the guide (20) and the bottom portion (12a) of the molding recess (12) is formed in the molding recess (12). It bulges outward to increase the thickness. Further, as the punch (30) moves, the rod (51a) of the fluid pressure cylinder (51) is shortened to prevent the axial displacement of the mandrel (40).

Here, it is desirable to provide a time lag t ₀ between the start of movement of the punch (30) and the start of movement of the guide (20). That is, when starting pressurization of the planned processing portion (2) of the material (1) by the punch (30), the position of the guide (20) is first fixed to the initial position, and then the punch (30) Is moved, and the planned processing portion (2) of the material (1) is pressurized in the axial direction by the punch (30). After the lapse of time lag t ₀ , the guide (20) is moved in the direction opposite to the punch moving direction (35) while the punch (30) is continuously pressed against the planned processing portion (2) of the material (1) ( Move to 25). At this time, the moving speed of the guide (20) is such that the material (1) to be processed (2) exposed between the tip (20a) of the guide (20) and the bottom (12a) of the molding recess (12). It is controlled by the control device of the guide drive device (60) so as to be equal to or less than the buckling limit length in the cross-sectional area of the exposed portion. In addition, when the machining conditions are determined, it is possible to use a cylinder or a mechanical cam that can obtain a constant speed of the design amount.

  Along with the movement of the punch (30) and the guide (20), the planned processing part (2) of the material (1) gradually bulges outward so that the thickness increases in the molding concave part (12), and the processing is scheduled. The material of the portion (2) is press-fitted into the molding recess (12) and is filled.

And as shown in FIG. 5, the front-end | tip part of a punch (30) is a stop position with respect to the shaping | molding recessed part (12) bottom part (12a) of the front-end | tip part of the punch (30) calculated | required from the design volume of a bulging part (4). When _XP is reached, the movement of the punch (30) is stopped, and the tip (20a) of the guide (20) is formed in the molding recess (12a) of the tip (20a) of the guide (20) determined by the design. upon reaching the stop position X _g for bottom (12a), to stop the movement of the guide (20). At this time, the material of the planned processing portion (2) of the raw material (1) is completely filled in the molding recessed portion (12), and the processing planned portion (2) is bulged into the design shape.

  With the above procedure, the process of increasing the thickness of the planned processing portion (2) of the material (1) is completed.

  Next, the punch (30) is pulled out from the hollow portion (2a) (3a) of the planned processing portion (2) of the material (1) and the non-processing planned portion (3) of the core (40). The material (1) is moved outward in the axial direction from the position of the axial end of 1). As a result, the punch (30) is removed from the position of the axial end of the material (1) and the mandrel (40) is withdrawn [the mandrel (40) is removed and the punch (30) is removed. work]. Then, the upsetting product (6A) is extracted from the restraining hole (11) of the restraining die (10).

In the first embodiment, the molding recess (12) of the tip portion of the punch (30) and the stop position X _P for the bottom (12a), the guide forming the recess (12) the bottom of the distal end portion of (20) (20a) (12a ) With the stop position _Xg . In the present invention, it may not coincide with the X _P and X _g.

  Thus, in the upsetting method of the first embodiment, when pressing the planned processing portion (2) of the material (1) with the punch (30), the planned processing portion (2) of the material (1). The inner peripheral surface of the non-scheduled part (3) is restrained by the peripheral surface of the mandrel (40), and the outer peripheral surface of the non-scheduled part (3) is the periphery of the restraint hole (11) of the restraining die (10). Since it is constrained by the surface, buckling to the inside and outside of the non-processed portion (3) of the material (1) is prevented, and buckling to the inside of the processing portion (2) is prevented. . Furthermore, the processing target portion (2) of the material (1) is disposed in the insertion hole (21) of the guide (20), so that the outer peripheral surface of the processing target portion (2) is the peripheral surface of the insertion hole (21). Thus, buckling to the outside of the planned processing portion (2) is prevented. In this state, the guide (20) is moved in a direction (25) opposite to the punch moving direction (35) while the punch (30) is pressed in the axial direction on the planned processing portion (2) of the material (1). As a result, the processing target portion (2) of the material (1) exposed between the tip portion (20a) of the guide (20) and the bottom portion (12a) of the molding recess (12) is formed in the molding recess (12). As the thickness increases, it will bulge out reliably and well to the outside. As a result, a high-quality cylindrical upsetting product (6A) can be obtained.

  As described above, this upsetting product (6A) is, for example, a preform for producing a part of a collar member for a bush or a preform for producing a part of a shaft member of a vehicle arm. Or as a preform for manufacturing a member provided with a screw hole at an end of a cylindrical shaft portion. Furthermore, this upsetting product (6A) is used as a member in which another member is joined and integrated to the end of the cylindrical shaft portion by friction stir welding, that is, a member to be joined for friction stir welding. Specifically, it is used as a preform for producing the above-described vehicle arm shaft member.

  Here, such a cylindrical upsetting product (6A) is obtained that has a bulging portion (4) that bulges outward so as to increase the thickness at a predetermined site. For this reason, conventionally, processing is mainly performed by a hydroform method or a hot bulge method, and expensive and large-scale equipment is required. The hydroforming method and the hot bulge method are mainly used as processing methods for obtaining large products. Conventionally, machining such as cutting has been used as processing for obtaining small products. It was done. However, according to the upsetting method of the above embodiment, since a large molding pressure is not required for processing, the processing apparatus can be simplified. In addition, the punch (30) and guide (20) are combined with a high-speed hydraulic cylinder and a mechanical cam to form a die set, which is installed in a mechanical press to dramatically improve the tact time compared to the conventional method. It becomes possible. Furthermore, a significant improvement in yield can be achieved as compared with machining, and a significant cost reduction effect can be obtained.

  Furthermore, in this embodiment, since the guide (20) is moved by the driving force of the guide drive device (60), the guide (20) can be moved reliably.

  Furthermore, since the tip of the punch (30) is formed in a cross-sectional shape corresponding to the cross-sectional shape of the axial end of the material (1), the processing target portion (2) of the material (1) is removed from the punch (30). Can be reliably pressurized.

  Further, since the mandrel (40) is connected to the punch (30) so as to extend in the axial direction of the punch (30), the mandrel (40) is connected to the processing scheduled portion (2) of the material (1) and Place the mandrel (40) in the hollow part (2a) (3a) of the non-scheduled part (3) and pressurize the planned part (2) of the material (1) with the punch (30). Therefore, the punch (30) can be set at the same time as the punch (30), and the work efficiency of the upsetting process can be improved.

  Furthermore, after the processing is finished, the mandrel (40) is extracted from the inside of the hollow portion (2a) (3a) of the planned processing portion (2) of the material (1) and the non-processing planned portion (3) ( 40), the punch (30) can be removed from the position of the axial end of the material (1), and the punch (30) can be removed at the same time. Further improvement can be achieved.

  Further, the mandrel (40) is connected to the punch (30) via an expansion / contraction device (50) that can extend and contract in the axial direction, and the expansion / contraction device (50) is shortened as the punch (30) moves. Therefore, it is possible to reliably prevent a problem that the position of the mandrel (40) is shifted due to the movement of the punch (30) and the swell of the processing target portion (2) of the material (1).

  Furthermore, since the fluid pressure cylinder (51) is used as the telescopic device (50), it is possible to reliably prevent such a problem.

  Furthermore, since the chamfering process (the chamfered part (21a)) is applied to the edge of the insertion hole (21) of the tip part (20a) of the guide (20), the tip part of the guide (20) during processing The back pressure of the material of the planned processing portion (2) of the material (1) effectively acts on (20a). As a result, the driving force of the guide drive device (60) required to move the guide (20) can be reduced, and the guide drive device (60) can be downsized.

  Next, preferable processing conditions in the upsetting method of the present embodiment will be described below.

P is the average moving speed from the start of punch (30) movement.
G, the average movement speed from the start of movement of the guide (20)
The buckling limit length at the cross-sectional area of the planned processing part (2) of the material (1) before upsetting is X ₀ ,
The initial clearance between the tip (20a) of the guide (20) and the bottom (12a) of the molding recess (12) is X (where 0 ≦ X ≦ X ₀ ),
The length of the material (1) before upsetting necessary for the bulging portion (4) is L ₀ ,
The stop position of the tip portion of the punch (30) obtained from the design volume of the bulge portion (4) with respect to the molding recess (12) bottom portion (12a) is expressed as _XP ,
The stop position of the tip (20a) of the guide (20) determined by the design with respect to the molding recess (12) bottom (12a) is X _g ,
The time lag from the start of movement of the punch (30) to the start of movement of the guide (20) is t ₀ (where 0 ≦ t ₀ ),
And

  In this upsetting method, it is desirable that G satisfies the following formula (i).

G = (X _g −X) P / (L ₀ −X _P −Pt ₀ ) (i)

  When G satisfies the above formula (i), the planned processing portion (2) of the material (1) can be reliably formed into a designed shape.

  The reason why the above formula (i) is set for G will be described below.

When the time from the start of the movement of the punch (30) to the end of the upsetting process (that is, the upsetting process time) is t, the tip of the punch (30) and the bottom of the molding recess (12) at the end of the upsetting process t. the distance between (12a), i.e., the position X _P for forming the recess (12) the bottom of the tip portion of the punch (30) (12a) is given by the following formula (ia).

L ₀ −Pt = X _P (ia)
∴t = (L ₀ −X _P ) / P (ib)

Further, the distance between the tip (20a) of the guide (20) and the bottom (12a) of the molding recess (12) at the end of the upsetting t, that is, molding of the tip (20a) of the guide (20). position X _P for the recess (12) bottom (12a) is given by the following equation (ics).

X + G (t−t ₀ ) = X _g (ic)

  The above formula (i) is derived by substituting the above formula (i-b) into (i-c) and rearranging with respect to G.

  Here, in the first embodiment, at the time of upsetting, the guide (20) is moved by the driving force of the guide driving device (60). However, in the present invention, the guide (20) is not necessarily driven as such. It does not need to be moved by force. That is, in the present invention, the guide (20) may be moved by a push-back force that acts on the guide (20) by press-fitting the material (1) into the molding recess (12) of the material (1). good. In this case, the guide (20) can be moved without necessarily using the guide driving device (60), so that the upsetting apparatus (1A) can be simplified.

  7 to 11 are schematic views for explaining an upsetting method using the upsetting apparatus for a cylindrical material according to the second embodiment of the present invention.

  In FIG. 7, (1B) is an upsetting apparatus according to the second embodiment, and (1) is a cylindrical material. Further, in FIG. 11, (6B) is a cylindrical upsetting product manufactured by the upsetting apparatus (1B). This upsetting product (1B) is, for example, a preform for producing a cylindrical collar member to be mounted at the center of a vehicle bush or a preform for producing a shaft member of a vehicle arm. Or as a preform for manufacturing a member provided with screw holes at both ends of a cylindrical shaft portion. Alternatively, it is used as a member in which another member is joined and integrated to the end portion of the cylindrical shaft portion by friction stir welding, that is, a cylindrical member to be joined for friction stir welding. In other words, the upsetting apparatus (1B) is, for example, a bush color member preform manufacturing apparatus, a vehicle arm shaft member preform manufacturing apparatus, or a friction stir welding bonded member manufacturing apparatus. It can be said that. (5) is the shaft portion of the upsetting product (6B) made of the non-processed portion (3) of the material (1), and (4) is the bulge formed at both ends of the shaft portion (5). Part. Each bulging portion (4) bulges so that the thickness increases outside the material (1).

  The configuration of the upsetting apparatus (1B) of the second embodiment will be described below with a focus on the difference from that of the first embodiment (1A).

  As shown in FIGS. 7 and 8, the material (1) is a straight cylindrical shape like the material of the first embodiment, and more specifically a straight round pipe shape.

  In this material (1), the intermediate portion in the axial direction of the material (1) corresponds to the non-scheduled portion (3), and both sides in the axial direction of the material (1), more specifically, the axial direction of the material (1). Both end portions correspond to the planned processing portions (2) and (2), respectively. And each thickness increase processing is carried out to the both ends of raw material (1) (shaft part (5)) by each thickness increasing process of each process part (2) (2) of raw material (1) to a design shape, respectively. Thus, the bulging portions (4) and (4) bulging outward are formed.

  The upsetting apparatus (1B) is for bulging out the planned processing parts (2) and (2) on both sides in the axial direction of the material (1) so that the thickness increases. The upsetting apparatus (1B) includes a mandrel (40), a constraining die (10), two molding recesses (12) (12), two guides (20) (20), 2 One punch (30) (30), two guide driving devices (60) (60), and two punch driving devices (70) (70) are provided.

  The mandrel (40) is a straight rod having a circular cross section, and the hollow portions (2a) (2a) of both the planned processing portions (2) (2) and the non-processing planned portion (3) of the material (1). ) Inserted and placed in (3a) to constrain the inner peripheral surfaces of both planned processing parts (2), (2) and non-processed planned parts (3) in a buckling-prevented state with the peripheral surface of the mandrel (40) It is. The diameter of the mandrel (40) is set constant in the axial direction.

  Further, the mandrel (40) is equally divided into two at its axially intermediate portion, that is, composed of two mandrel halves (40a) (40a). The lengths of the two mandrel half pieces (40a) and (40a) are set to the same length.

  The restraining die (10) has a restraining hole (11) extending in the axial direction thereof. The non-processed portion (3) of the material (1) is inserted and disposed in the restraint hole (11), and the outer peripheral surface of the non-processed portion (3) is prevented from buckling by the peripheral surface of the restraint hole (11). It is supposed to be bound to the state. The restraint hole (11) is provided through the restraint die (11) in the axial direction.

  Each shaping | molding recessed part (12) is continuously provided by the restraint hole (11) in the axial direction both sides (detailed both ends) of the restraint die | dye (10), respectively.

  Each guide (20) has an insertion hole (21) extending in its axial direction. In each of the insertion holes (21), a corresponding planned processing portion (2) of the material (1) is inserted and arranged, and the corresponding planned processing portion (2) in the insertion hole (21) is moved in the axial direction. It is configured to be freely held in a buckling prevention state. Each insertion hole (21) is provided through the guide (20) in the axial direction.

  Each guide (20) is movable in a direction (25) opposite to the corresponding punch movement direction (35).

  Moreover, the chamfering process is given to the opening hole (21) opening edge part of the front-end | tip part (20a) of each guide (20), Therefore The cross-sectional shape of this edge part is formed roundly. (21a) is a chamfered portion formed on the edge.

  Each punch (30) is for pressurizing the corresponding planned processing portion (2) of the material (1) in the axial direction.

  Further, a hollow portion extending in the axial direction is formed inside each punch (30), and an expansion / contraction device (50) capable of expanding and contracting in the axial direction is disposed in the hollow portion. The corresponding mandrel half piece (40a) is connected to each punch (30) via the telescopic device (50) so as to extend in the axial direction of the punch (30).

  The telescopic device (50) includes a fluid pressure cylinder (51). And the mandrel half piece part (40a) corresponding to the front-end | tip part of the expansion-contraction rod (51a) of each fluid pressure cylinder (51) is adhering.

  Each punch driving device (70) moves each punch (30) in the axial direction of the material (1), and presses the corresponding processing scheduled portion (2) of the material (1) to the punch (30). This pressure is applied. Each punch driving device (70) is connected to a corresponding punch (30).

  Each guide drive device (60) is for moving each guide (20) in the direction (25) opposite to the corresponding punch movement direction (35). Each guide driving device (60) is connected to a corresponding guide (20).

  Next, an upsetting method using the upsetting apparatus (1B) of the second embodiment will be described below.

  First, as shown in FIG.7 and FIG.8, the non-processed part (3) of a raw material (1) is inserted and arranged in the restraint hole (11) of a restraint die (10). Thereby, each process part (2) of a raw material (1) is arrange | positioned in the shaping | molding recessed part (12) to which a restraint die (10) respond | corresponds, respectively. In this state, the outer peripheral surface of the non-processed portion (3) of the material (1) is constrained by the peripheral surface of the constraining hole (11).

  Next, an opening at one end in the axial direction of the material (1) is left in a state in which the mandrel half piece (40a) is connected to each punch (30) via a fluid pressure cylinder (51) as an expansion device (50). To insert one of the metal half halves (40a) into the hollow portion (2a) (3a) of one of the planned processing portion (2) and non-processing planned portion (3) of the material (1) 1) From the opening at the other end in the axial direction, the other half of the mandrel (40a) is formed into the hollow portion (2a) (2a) (3a) of the planned processing portion (2) of the material (1) and the non-processing planned portion (3). ) Insert and place in [Set work of mandrel (40)]. By this operation, each punch (30) is arranged at the initial position on the corresponding axial end side of the material (1) [setting operation of the punch (30)], and at the same time, the double metal half halves (40a) The tip portions of (40a) abut each other in the hollow portion (3a) of the non-processed portion (3) of the material (1). In this state, the inner peripheral surfaces of both the planned processing portions (2) and (2) and the non-processing planned portion (3) of the material (1) are constrained by the peripheral surfaces of the double core metal half portions (40a) and (40a). Yes.

  Furthermore, the processing planned portion (2) of the corresponding material (1) is inserted and arranged in the insertion hole (21) of each guide (20). Thereby, the outer peripheral surface of each process part (2) of a raw material (1) is restrained by the peripheral surface of the insertion hole (21) of a corresponding guide (20), respectively.

Further, as shown in FIG. 8, an initial clearance X is provided between the tip (20a) of each guide (20) and the bottom (12a) of the corresponding molding recess (12). The intervals between the initial clearances X are the same as in the first embodiment described above, and the molding recesses (12) corresponding to the tips (20a) of the guides (20) in a state before the movement of the punches (30) is started. The buckling limit length (X ₀ ) in the cross-sectional area of the exposed part of the material (1) to be processed (2) exposed between the bottom part (12a) of the material and the bottom part (12a) is set.

  Next, as shown in FIG. 9, both punch driving devices (60) and (60) are simultaneously operated to move both punches (30) and (30) at the same time. By simultaneously operating both guide driving devices (70) and (70) while simultaneously pressing in the axial direction with the corresponding punches (30), each guide (20) is moved to the corresponding punch movement direction (35). Move simultaneously in opposite directions (25). As a result, the processing planned portion (2) of the material (1) exposed between the tip (20a) of each guide (20) and the bottom (12a) of the corresponding molding recess (12) becomes the corresponding molding recess. (12) It bulges outward so that the wall thickness increases. Further, the rod (51a) of the fluid pressure cylinder (51) is shortened with the movement of each punch (30), and the axial displacement of the mandrel half piece (40a) is prevented.

Here, a time lag t ₀ is provided between the start of movement of each punch (30) and the start of movement of the guide (20). That is, when starting pressurization of the planned processing portion (2) of the material (1) by each punch (30), the position of each guide (20) is first fixed to the initial position, and then each punch (30) is moved, and each processing scheduled portion (2) of the material (1) is pressurized in the axial direction by the corresponding punch (30). Then, after the lapse of the time lag t ₀ , the respective punches (30) continuously pressurize the corresponding processing scheduled portion (2) of the material (1), and each guide (20) is moved in the corresponding punch moving direction (35). ) In the opposite direction (25). At this time, the moving speed of each guide (20) is such that the material (1) to be processed (2) exposed between the tip (20a) of the guide (20) and the bottom (12a) of the molding recess (12). ) Is controlled by the control device of the guide drive device (60) so as to be less than the buckling limit length in the cross-sectional area of the exposed portion. In addition, when the processing conditions are determined, it is possible to use a cylinder or a mechanical cam that can obtain a constant speed of the design amount.

  As each punch (30) and each guide (20) move, each processing scheduled portion (2) of the material (1) gradually increases outward so that the thickness increases in the corresponding molding recess (12). Swelling occurs, and the material of the planned processing portion (2) is filled in the molding recess (12).

And as shown in FIG. 10, the front-end | tip part of each punch (30) is a shaping | molding recessed part (12) bottom part (12a) of the front-end | tip part of the punch (30) calculated | required from the design volume of a corresponding bulging part (4). When the stop position _XP is reached, the movement of each punch (30) is stopped, and the tip (20a) of each guide (20) is fixed to the tip (20a) of the guide (20) determined by design. When the stop position _Xg is reached with respect to the bottom (12a) of the molding recess (12), the movement of each guide (20) is stopped. At this time, the material of each processing planned portion (2) of the raw material (1) is completely filled in the corresponding molding recess (12), and each processing planned portion (2) is bulged into the design shape. Yes.

  With the above procedure, the process of increasing the thickness of both the scheduled processing parts (2) and (2) of the material (1) is completed.

  Next, each half of the mandrel (40a) is extracted from the hollow parts (2a), (2a) and (3a) of both the parts to be processed (2) (2) and the non-processed parts (3) of the material (1). Therefore, each punch (30) is moved from the position of the axial end of the material (1) to the outside in the axial direction of the material (1). As a result, each punch (30) is removed from the position of the axial end of the material (1), and at the same time, each half half of the core (40a) is extracted [extraction operation and punch of the core (40) (30) Removal work]. Next, the upsetting product (6B) is extracted from the restraint hole (11) of the restraint die (10).

In the second embodiment, the stop position X _P shaped recess (12) the bottom of the tip relative to (12a) of each punch (30), forming recesses (12) the bottom of the distal end portion of each guide (20) (20a) The stop position _Xg with respect to (12a) coincides. In the present invention, it may not coincide with the X _P and X _g.

  In addition, it is desirable that the average moving speed G from the start of movement of each guide (20) satisfies the above-described formula (i).

  Thus, in the upsetting method of the second embodiment, each guide (20) while simultaneously pressing each scheduled portion (2) of the material (1) in the axial direction with the corresponding punch (30). Are moved in the opposite direction (25) to the corresponding punch movement direction (35), so that both the planned processing portions (2) and (2) of the material (1) are bulged outwardly simultaneously. It is possible to efficiently manufacture the upsetting product (6B) in which the bulging portions (4) and (4) that bulge outward are formed on both side portions of each.

  Further, each of the mandrel half pieces (40a) is disposed in the hollow portion (2a) (3a) of the planned processing portion (2) of the material (1) and the non-working planned portion (3) (40a). ) And the respective punches (30) are arranged on the end side in the axial direction of the material (1) in order to press the corresponding processing scheduled portion (2) of the material (1) with each punch (30). The setting work of the punch (30) can be performed at the same time, so that the work efficiency of upsetting can be improved.

  Further, after the processing is finished, each mandrel half piece (40a) is extracted from the processing portion (2) of the material (1) and the hollow portion (2a) (3a) of the non-processing portion (3). The mandrel half piece (40a) can be removed and the punch (30) can be removed at the same time by removing each punch (30) from the position of the axial end of the material (1). The work efficiency of the machining can be further improved.

  Furthermore, since the length of the mandrel (40) is shortened by dividing the mandrel (40) into two at its axially intermediate portion, the insertion time of the mandrel (40) into the predetermined hollow portion (2a) (3b) Thus, the work efficiency of upsetting can be further improved.

  Here, in the second embodiment, at the time of upsetting, each guide (20) is moved by the driving force of the guide driving device (60). However, in the present invention, each guide (20) is not necessarily so. It does not need to be moved by a strong driving force. That is, in the present invention, each guide (20) is moved by a push-back force that acts on the guide (20) by press-fitting the material of each planned processing portion (2) of the material (1) into the molding recess (12). May be. In this case, each guide (20) can be moved without necessarily using each guide drive device (60), and thus the upsetting apparatus (1B) can be simplified.

  12-14 is the schematic for demonstrating the upsetting method using the upsetting apparatus of the cylindrical raw material which concerns on 3rd Embodiment of this invention.

  In FIG. 12, (1C) is an upsetting apparatus according to the third embodiment, and (1) is a cylindrical material. Moreover, in FIG. 14, (6C) is a cylindrical upsetting product manufactured by the upsetting apparatus (1C). This upsetting product (6C) is, for example, a preform for manufacturing a shaft member of a vehicle arm or a process for manufacturing a member provided with screw holes at both ends of a cylindrical shaft portion. It is used as a renovation. Alternatively, it is used as a member in which another member is joined and integrated to the end portion of the cylindrical shaft portion by friction stir welding, that is, a cylindrical member to be joined for friction stir welding. (5) is the shaft portion of the upsetting product (6C) made of the non-processed portion (3) of the material (1), and (4) is the bulge formed at one end of the shaft portion (5). Part. The bulging portion (4) bulges so that the thickness increases inside the material (1) (that is, radially inward of the material (1)).

  The configuration of the upsetting apparatus (1C) of the third embodiment will be described below with a focus on differences from the first embodiment diameter (1A).

  As shown in FIG. 12, the material (1) has a straight cylindrical shape, like the material of the first embodiment, and more specifically, a straight round pipe shape.

  The planned processing portion (2) of the material (1) is located on one side of both sides in the axial direction of the material (1), and more specifically, located on one axial end of the material (1). That is, one end portion in the axial direction of the material (1) corresponds to the planned processing portion (2). On the other hand, the non-processed portion (3) of the material (1) is located at the other axial end of the material (1), that is, the other end of the material (1) in the axial direction is the non-processed portion ( It corresponds to 3). Then, when the planned processing portion (2) of the material (1) is thickened to the design shape, as shown in FIG. 14, the thickness of the end portion of the material (1) (shaft portion (5)) is increased. A bulging portion (4) bulging inward so as to increase is formed.

  The upsetting apparatus (1C) is for bulging the planned processing part (2) of the material (1) inward so that the wall thickness increases. This upsetting device (1C) includes a mandrel (40), a constraining die (10), a molding recess (12), a guide (20), a punch (30), a guide driving device (60), And a punch driving device (70).

  The mandrel (40) has a mandrel body (41) and a small diameter part (42) which is integrally provided at one end in the axial direction of the mandrel body (41) and has a smaller diameter than the mandrel body (41). Yes. In this mandrel (40), the mandrel body (41) is inserted and arranged in the hollow part (3a) of the non-processed scheduled part (3) of the material (1), and the inner peripheral surface of the non-processed planned part (3) Is restrained in a buckling-preventing state on the peripheral surface of the mandrel body (41). The small diameter portion (42) of the mandrel (40) is disposed in the hollow portion (2a) of the planned processing portion (2) of the material (1), and the inner peripheral surface and the small diameter portion (42) of the planned processing portion (2). ) To form a concave portion (12).

  The restraining die (10) has a restraining hole (11) extending in the axial direction thereof. In the constraining hole (11), a planned processing portion (2) and a non-processed planned portion (3) of the material (1) are arranged, and outer peripheral surfaces of the planned processing portion (2) and the non-processed planned portion (3). Is restrained in a buckling-prevented state on the peripheral surface of the restraining hole (11).

  Further, the constraining die (10) is vertically divided into a plurality of pieces, that is, a split die.

  The punch (30) is for pressing the planned processing portion (2) of the material (1) in the axial direction. The tip of the punch (30) has a cross-sectional shape corresponding to the cross-sectional shape of the axial end of the material (1) (that is, the planned processing portion (2)), that is, the tip of the punch (30). The cross-sectional shape is an annular shape.

  Further, a hollow portion (31) extending in the axial direction is formed inside the punch (30). The hollow portion (31) is provided through the punch (30) in the axial direction.

  The guide (20) is disposed in the hollow portion (2a) of the planned processing portion (2) of the material (1), and the inner peripheral surface of the planned processing portion (2) is constrained by the peripheral surface of the guide (20). Is.

  The guide (20) is movable in the direction (25) opposite to the punch moving direction (35). The guide (20) is inserted and disposed in the cavity (31) of the punch (30), and is disposed so as to be movable in the axial direction within the cavity (31).

  Further, the peripheral edge of the tip (20a) of the guide (20) is chamfered, so that the cross-sectional shape of the peripheral is rounded. (21a) is a chamfered portion formed on the peripheral edge.

  Furthermore, a hollow portion extending in the axial direction is formed inside the guide (20), and a fluid pressure cylinder (51) is disposed in the hollow portion as an expansion / contraction device (50) that can expand and contract in the axial direction. Yes. The mandrel (40) is connected to the guide (20) through the fluid pressure cylinder (51) so as to extend in the axial direction of the guide (20). A small diameter portion (42) of the mandrel (40) is separably fixed to the tip of the telescopic rod (51a) of the fluid pressure cylinder (51).

  The punch driving device (70) moves the punch (30) in the axial direction of the material (1), and applies a pressing force to the punch (30) to press the planned processing portion (2) of the material (1). Is to do. The punch driving device (70) is connected to the punch (30).

  The guide driving device (60) moves the guide (20) in the direction (25) opposite to the punch moving direction (35). The guide driving device (60) is connected to the guide (20).

  Next, an upsetting method using the upsetting apparatus (1C) of the third embodiment will be described below.

  First, as shown in FIG. 12, the processing scheduled portion (2) and the non-processing scheduled portion (3) of the material (1) are inserted and arranged in the constraint hole (11) of the constraint die (10). Thereby, the outer peripheral surfaces of the planned processing portion (2) and the non-processing planned portion (3) of the material (1) are restrained by the peripheral surface of the restraining hole (11).

  Next, with the mandrel (40) connected to the guide (20) via the fluid pressure cylinder (51), the mandrel body (41) is placed on the non-processed portion (3) of the material (1). Insert and place in the hollow part (3a) and insert and place the small diameter part (42) of the mandrel (40) in the hollow part (2a) of the part to be processed (2) [Set operation of the mandrel (40) ]. By this operation, the guide (20) is arranged in the hollow portion (2a) of the planned processing portion (2) of the material (1) [setting operation of the guide (20)]. In this state, the inner peripheral surface of the planned processing portion (2) of the material (1) is constrained by the peripheral surface of the guide (20).

  Further, the guide (20) is inserted and disposed in the hollow portion (31) of the punch (30), and the punch (30) is disposed at the initial position on the axial end side of the material (1).

Furthermore, an initial clearance X is provided between the tip (20a) of the guide (20) and the bottom (12a) of the molding recess (12). The interval between the initial clearances X is a material exposed between the tip (20a) of the guide (20) and the bottom (12a) of the molding recess (12) before the punch (30) starts to move ( The buckling limit length (X ₀ ) in the cross-sectional area of the exposed portion of the planned processing portion (2) in 1) is set to be equal to or less.

  Next, as shown in FIG. 13, the punch drive device (70) is operated to move the punch (30), and the punch (30) is used to add the planned processing portion (2) of the material (1) in the axial direction. While pressing, the guide drive device (60) is operated to move the guide (20) in the direction (25) opposite to the punch moving direction (35). As a result, the processing target portion (2) of the material (1) exposed between the tip portion (20a) of the guide (20) and the bottom portion (12a) of the molding recess (12) is formed in the molding recess (12). It bulges inward so that the thickness increases. Further, the rod (51a) of the fluid pressure cylinder (51) is extended with the movement of the punch (30) to prevent the axial displacement of the mandrel (41).

Here, it is desirable to provide a time lag t ₀ between the start of movement of the punch (30) and the start of movement of the guide (20). That is, when starting pressurization of the planned processing portion (2) of the material (1) by the punch (30), the position of the guide (20) is first fixed to the initial position, and then the punch (30) Is moved, and the planned processing portion (2) of the material (1) is pressurized in the axial direction by the punch (30). After the lapse of time lag t ₀ , the guide (20) is moved in the direction opposite to the punch moving direction (35) while the punch (30) is continuously pressed against the planned processing portion (2) of the material (1) ( Move to 25).

  As the punch (30) and guide (20) move, the planned processing part (2) of the material (1) gradually bulges inward so that the thickness increases in the molding concave part (12), and the processing is scheduled. The material of the part (2) is filled in the molding recess (12).

And as shown in FIG. 14, the stop position of the front-end | tip part of a punch (30) with respect to the shaping | molding recessed part (12) bottom part (12a) of the front-end | tip part of a punch (30) calculated | required from the design volume of a bulging part (4) When _XP is reached, the movement of the punch (30) is stopped, and the tip (20a) of the guide (20) is formed in the recess (12) of the tip (20a) of the guide (20) as determined by the design. upon reaching the stop position X _g for bottom (12a), to stop the movement of the guide (20). At this time, the material of the planned processing portion (2) of the raw material (1) is completely filled in the molding recessed portion (12), and the processing planned portion (2) is bulged into the design shape.

  With the above procedure, the process of increasing the thickness of the planned processing portion (2) of the material (1) is completed.

  Next, the fluid pressure cylinder (51) and the mandrel (40) are separated and the bottom (15) of the constraining die (10) is removed, and then the mandrel (40) is removed from the material (1) to be processed. Pull out from the hollow part (3a) of (3), and remove the guide (20) and punch (30).

In the third embodiment, the molding recess (12) the bottom of the molding recess (12) the bottom of the tip and the stop position X _P for (12a), the distal end portion of the guide (20) (20a) of the punch (30) (12a ) With the stop position _Xg . In the present invention, it may not coincide with the X _P and X _g.

  Further, it is desirable that the average moving speed G from the start of the movement of the guide (20) satisfies the above formula (i).

  Thus, in the upsetting method according to the third embodiment, when the processing target portion (2) of the material (1) is pressed with the punch (30), the non-processing portion (3) of the material (1) is selected. ) Is constrained by the peripheral surface of the mandrel body (41), and the outer peripheral surfaces of the processing scheduled portion (2) and the non-processing scheduled portion (3) are the restraining holes (11) of the constraining die (10). Since it is restrained by the peripheral surface, buckling of the material (1) to the inside and outside of the non-processed portion (3) is prevented, and buckling of the material (1) to the outside is prevented. Yes. Further, the guide (20) is disposed in the hollow portion (2a) of the planned processing portion (2) of the material (1), so that the inner peripheral surface of the planned processing portion (2) is the peripheral surface of the guide (20). Thus, buckling to the inside of the processing scheduled portion (2) is prevented. In this state, the guide (20) is moved in a direction (25) opposite to the punch moving direction (35) while the punch (30) is pressed in the axial direction on the planned processing portion (2) of the material (1). As a result, the processing target portion (2) of the material (1) exposed between the tip portion (20a) of the guide (20) and the bottom portion (12a) of the molding recess (12) is formed in the molding recess (12). As the thickness increases, it swells reliably and well inside. As a result, a high-quality cylindrical upsetting product (6C) can be obtained.

  Furthermore, since the guide (20) is moved by the driving force of the guide drive device (60), the guide (20) can be moved reliably.

  Furthermore, since the tip of the punch (30) is formed in a cross-sectional shape corresponding to the cross-sectional shape of the axial end of the material (1), the processing target portion (2) of the material (1) is removed from the punch (30). Can be reliably pressurized.

  Further, since the mandrel (40) is connected to the guide (20) so as to extend in the axial direction of the guide (20), the mandrel body (41) is attached to the non-processed portion (3) of the material (1). ) In the hollow portion (3a), the small diameter portion (42) is placed in the hollow portion (2a) of the planned processing portion (2), and the mandrel (40) is set and the guide (20) is made of the material ( The setting operation of the guide (20) arranged in the hollow portion (2a) of the planned processing portion (2) of 1) can be performed at the same time, so that the work efficiency of upsetting can be improved.

  Further, since the fluid pressure cylinder (51) is extended with the movement of the guide (20), the mandrel (2) is moved along with the movement of the guide (20) and the swelled portion (2) of the material (1). 40) It is possible to surely prevent a problem that the position is shifted.

  Furthermore, since the fluid pressure cylinder (51) is used as the telescopic device (50), it is possible to reliably prevent such a problem.

  Further, since the peripheral edge of the tip (20a) of the guide (20) is chamfered (the chamfered part (21a)), the material ( The back pressure of the material of the planned processing part (2) of 1) is effectively applied. As a result, the driving force of the guide drive device (60) required to move the guide (20) can be reduced, and the guide drive device (60) can be downsized.

  Here, in the third embodiment, at the time of upsetting, the guide (20) is moved by the driving force of the guide driving device (60). However, in the present invention, the guide (20) is not necessarily driven as such. It does not need to be moved by force. That is, in the present invention, the guide (20) may be moved by a push-back force that acts on the guide (20) by press-fitting the material (1) into the molding recess (12) of the material (1). good. In this case, the guide (20) can be moved without necessarily using the guide driving device (60), so that the upsetting apparatus (1C) can be simplified.

  FIG. 15 is a schematic view showing a modification of the upsetting apparatus (1A) of the first embodiment.

  In this modification, a compression coil spring (52) is used as the expansion device (50). The spring (52) is configured to be shortened as the punch (30) moves during processing.

  In addition, this spring (52) is applicable also as each expansion-contraction apparatus (50) in the upsetting apparatus (1B) of the said 2nd Embodiment.

  FIG. 16 is a schematic view showing another modification of the upsetting apparatus (1C) of the third embodiment.

  In this modification, a coil spring (52) is used as the telescopic device (50). The spring (52) is configured to be extended with the movement of the guide (20) during processing.

  17 to 19 are schematic views for explaining an upsetting method using an upsetting apparatus for a cylindrical material according to a fourth embodiment of the present invention.

  In FIG. 17, (1D) is a cylindrical material upsetting apparatus according to the fourth embodiment. 17 to 19, the same reference numerals are given to the same components as those of the upsetting apparatus (1 </ b> B) of the second embodiment illustrated in FIGS. 7 to 10. Hereinafter, the configuration of the upsetting apparatus (1D) of the fourth embodiment will be described focusing on the difference from the configuration of the upsetting apparatus (1B) of the second embodiment.

  The cylindrical upsetting product manufactured by the upsetting apparatus (1D) of the fourth embodiment is the same as the cylindrical upsetting product (6B) shown in FIG.

  As shown in FIG. 17, this upsetting apparatus (1D) includes all the configurations of the upsetting apparatus (1B) of the second embodiment, two heating means (80) (80), and Two cooling means (85) and (85) are provided.

  The two heating means (80) (80) have the same configuration. Each heating means (80) locally heats a portion (2x) corresponding to the tip (20a) of the guide (20) in each processing scheduled portion (2) of the material (1). The heating means (80) is an induction heating means (81) having an induction heating coil (81a) and a power supply unit (81b) for supplying an alternating current (or an alternating voltage) to the coil (81a).

  The surface of the induction heating coil (81a) is covered with an insulating layer (not shown) made of an insulating tape or the like. Further, the coil (81a) is embedded in the axially opposite ends of the constraining die (10) so as to surround the corresponding molding recess (12).

  The constraining die (10) is made of a hard conductive material having heat resistance (eg, heat resistant metal material) such as steel.

  In this induction heating means (81), when a current (voltage) of a predetermined frequency (eg, high frequency or low frequency) is supplied to the coil (81a) by the power supply unit (81b), the coil (81a) of the induction heating means (81) is supplied. ), The axial end of the constraining die (10) is locally induction-heated, whereby the portion corresponding to the tip (20a) of the guide (20) in each planned processing portion (2) of the material (1) (2x) is configured to be locally heated by the heat at the axial end of the constraining die (10). That is, the portion (2x) of the material (1) is locally heated by conduction of heat at the axial end portion of the constraining die (10) to the portion (2x) of the material (1). Furthermore, in this induction heating means (81), the heating temperature of the part (2x) of the material (1) is increased by increasing the amount of current supplied to the coil (81a) and the part (2x). It is configured to be locally heated to a semi-molten state.

  The two cooling means (85) and (85) have the same configuration. Each cooling means (85) locally cools a portion (2y) corresponding to a portion closer to the base end side than the tip end portion (20a) of the guide (20) in each processing scheduled portion (2) of the material (1). To do. The cooling means (85) has a coolant flow path (85a). The coolant flow path (85a) is provided inside the base end portion of the guide (20) as the inside of the portion on the base end side with respect to the tip end portion (20a) of the guide (20). The cooling means (85) is configured to locally cool the portion (2y) of the material (1) by circulating a coolant such as cooling water in the coolant flow passage (85a). Has been.

  Reference numerals (88) and (88) are two coolant flow passages provided inside the axially intermediate portion of the constraining die (10). In each of the coolant flow passages (88), the heat generated by the coil (81a) of the induction heating means (81) is conducted to other parts of the constraining die (10) by allowing the coolant to flow therethrough. It is what suppresses.

  The other configuration of the upsetting apparatus (1D) of the fourth embodiment is the same as that of the upsetting apparatus (1B) of the second embodiment.

  Next, an upsetting method using the upsetting apparatus (1D) of the fourth embodiment will be described below.

  First, as shown in FIG. 17, the non-processed scheduled part (3) of the material (1) is inserted and arranged in the restraining hole (11) of the restraining die (10). Thereby, each process part (2) of a raw material (1) is arrange | positioned in the shaping | molding recessed part (12) to which a restraint die (10) respond | corresponds, respectively. In this state, the outer peripheral surface of the non-processed portion (3) of the material (1) is constrained by the peripheral surface of the constraining hole (11).

  Next, the setting operation of the mandrel (40) and the setting operation of the punch (30) described in the second embodiment are performed. As a result, the inner peripheral surfaces of both the planned processing portions (2), (2) and the non-processing planned portion (3) of the material (1) are converted into the mandrel (40) (more specifically, the two mandrel half pieces (40a) ( 40a)).

  Furthermore, the processing planned portion (2) of the corresponding material (1) is inserted and arranged in the insertion hole (21) of each guide (20). Thereby, the outer peripheral surface of each process part (2) of a raw material (1) is restrained by the peripheral surface of an insertion hole (21).

  Furthermore, it is desirable to provide an initial clearance X (see FIG. 8) between the tip (20a) of each guide (20) and the bottom (12a) of the corresponding molding recess (12) as necessary. .

  Further, by supplying a current of a predetermined frequency to the coil (81a) of each induction heating means (81) by the power supply unit (81b), the constraining die (10) by the coil (81a) of each induction heating means (81) Both end portions in the axial direction are induction-heated locally. As a result, the portion (2x) corresponding to the tip (20a) of the guide (20) in each planned processing portion (2) of the material (1) is localized by the heat at the axial end of the constraining die (10). To be heated. As a result, the deformation resistance at the part (2x) of the material (1) is locally reduced.

  The heating temperature may be any temperature that reduces the deformation resistance of the part (2x) of the material (1), and is not limited, but specific examples of suitable heating temperatures are as follows: It is as follows.

  For example, when the material of the material (1) is aluminum or an aluminum alloy, 200 to 580 ° C. (particularly preferably 350 to 540 ° C.) may be mentioned as a suitable heating temperature range. Furthermore, when heating the said part (2x) of a raw material (1) to a semi-molten state, 580-625 degreeC (especially preferably 600-615 degreeC) etc. are mentioned as a range of suitable heating temperature. However, the present invention is not limited to the heating temperature within the above range.

  Furthermore, the coolant (85a) of each cooling means (85) is circulated through the coolant flow passage (85a), so that the guide (20) in each processing scheduled portion (2) of the material (1) is circulated. The part (2y) corresponding to the part on the proximal end side with respect to the distal end part (20a) is locally cooled. Thereby, the fall of the deformation resistance in the said site | part (2y) of a raw material (1) can be suppressed.

  Suitable cooling temperatures in this case include 30 to 80 ° C. (particularly preferably 40 to 60 ° C.). However, the present invention is not limited to the cooling temperature within the above range.

  In addition, a normal temperature coolant is circulated in each coolant flow passage (88) provided in the constraining die (10). This suppresses the heat generated by the coil (81a) of each induction heating means (81) from being conducted to other parts of the constraining die (10).

  Next, while maintaining such a state, by the same procedure as the upsetting method shown in the second embodiment, as shown in FIGS. ) And (2) are simultaneously bulged outwardly so as to increase the thickness in the molding recesses (12) and (12).

  And if both the process scheduled parts (2) (2) of a raw material (1) swell to a design shape, after that, the extraction operation | work of the mandrel (40) demonstrated in the said 2nd Embodiment, and punch (30) Perform removal work. Next, by removing the material (1) from the restraining hole (11) of the restraining die (10), the cylindrical upsetting product (6B) shown in FIG. 11 is obtained.

  In this upsetting method, it is desirable that the average moving speed G from the start of movement of each guide (20) satisfies the above formula (i).

  Thus, the upsetting method of the fourth embodiment has the same advantages as the upsetting method of the second embodiment, and further has the following advantages.

  That is, each processing scheduled portion of the material (1) in a state where the portion (2x) corresponding to the tip (20a) of the guide (20) in each processing planned portion (2) of the material (1) is locally heated. Since (2) is bulged, the deformation resistance is locally reduced only in the part (2x) corresponding to the tip (20a) of the guide (20) among the planned processing parts (2) of the material (1). To do. Therefore, the molding pressure can be reduced. On the other hand, among the planned processing parts (2) of the material (1), the part (2y) corresponding to the part on the base end side from the tip part (20a) of the guide (20) is not heated, so deformation resistance Will not drop. Therefore, it is possible to prevent an increase in molding pressure that occurs when each end portion of the material (1) is crushed in the insertion hole (21) of the guide (20) by the pressing force from the punch (30).

  Furthermore, the both ends of the constraining die (10) in the axial direction are locally induction-heated by the induction heating means (81), whereby the tip end portion of the guide (20) in each processing scheduled portion (2) of the material (1) ( Since the part (2x) corresponding to 20a) is locally heated by the heat at the axial end of the constraining die (10), the part (2x) of the material (1) can be reliably and efficiently heated.

  Moreover, in this 4th Embodiment, you may heat the said part (2x) of a raw material (1) locally to a semi-molten state by raising heating temperature. In this case, the molding pressure can be greatly reduced. In this case, the upsetting process falls within the category of thixo molding.

  Further, the part (2y) corresponding to the base end side part of the guide (20) in each planned processing part (2) of the material (1) is locally cooled by the cooling means (85). In this state, since each processing scheduled portion (2) of the material (1) is bulged, it is possible to reliably prevent the part (2y) of the material (1) from being heated. A decrease in deformation resistance at the part (2y) can be reliably suppressed.

  Therefore, according to the upsetting method of the fourth embodiment, the high-quality cylindrical upsetting in which the bulging portions (4) bulging outward are formed on both sides in the axial direction so as to increase the thickness. Processed product (6B) can be manufactured.

  In the fourth embodiment, the both ends of the constraining die (10) in the axial direction are locally induction-heated by the induction heating means (81), so that the guides in the planned processing portions (2) of the material (1) are provided. The part (2x) corresponding to the tip part (20a) of (20) is locally heated by the heat of the axial end part of the constraining die (10). However, in the present invention, in addition, the part (2x) of the material (1) may be locally induction heated by the induction heating means (81). In this case, the part (2x) of the material (1) can be reliably and extremely efficiently heated. In this case, the constraining die (10) may be made of a hard conductive material having heat resistance (eg, a heat-resistant metal material) such as a steel material, or a ceramic or the like. Further, it may be made of a hard nonconductive material having heat resistance.

  Moreover, in the said 4th Embodiment, although the number of the process plan parts (2) of the raw material (1) is two, in the present invention, the number of the process plan parts (2) is one in addition. Also good.

  Here, in the fourth embodiment, at the time of upsetting, each guide (20) is moved by the driving force of the guide driving device (60). However, in the present invention, each guide (20) is not necessarily so. It does not need to be moved by a strong driving force. That is, in the present invention, each guide (20) is moved by a push-back force that acts on the guide (20) by press-fitting the material of each planned processing portion (2) of the material (1) into the molding recess (12). May be. In this case, each guide (20) can be moved without necessarily using each guide driving device (60), and thus the upsetting device (1D) can be simplified.

  20 to 22 are schematic views for explaining an upsetting method using an upsetting apparatus for a cylindrical material according to a fifth embodiment of the present invention.

  In FIG. 20, (1E) is a tubular material upsetting apparatus according to the fifth embodiment. 20 to 22, the same components as those of the upsetting apparatus (1C) of the third embodiment illustrated in FIGS. 12 to 14 are denoted by the same reference numerals. Hereinafter, with respect to the configuration of the upsetting apparatus (1E) of the fifth embodiment, the upsetting apparatus (1C) of the third embodiment and the configuration of the upsetting apparatus (1D) of the fourth embodiment will be described. The difference will be mainly described.

  As shown in FIG. 22, the cylindrical upsetting product manufactured by the upsetting apparatus (1E) of the fifth embodiment bulges inwardly so that the wall thickness increases at one end in the axial direction. The part (4) is formed, that is, the same as the cylindrical upsetting product (6C) manufactured by the upsetting apparatus (1C) of the third embodiment.

  As shown in FIG. 20, the upsetting apparatus (1E) includes all the configurations of the upsetting apparatus (1C) of the third embodiment, a heating means (80), and a cooling means (85). And.

  The heating means (80) locally heats a portion (2x) corresponding to the tip (20a) of the guide (20) in the planned processing portion (2) of the material (1). The heating means (80) is an induction heating means (81) having an induction heating coil (81a) and a power supply unit (81b) for supplying an alternating current (or an alternating voltage) to the coil (81a).

  The surface of the induction heating coil (81a) is covered with an insulating layer (not shown) made of an insulating tape or the like. Further, the coil (81a) is embedded in the axial end portion of the constraining die (10) so as to surround the molding recess (12).

  The constraining die (10) is made of a heat-resistant hard conductive material (eg, heat-resistant metal material) such as steel, or a heat-resistant hard non-conductive material such as ceramic. Consists of.

  In this induction heating means (81), when a current (voltage) of a predetermined frequency (eg, high frequency or low frequency) is supplied to the coil (81a) by the power supply unit (81b), the coil (81a) of the induction heating means (81) is supplied. ), The part (2x) corresponding to the tip (20a) of the guide (20) in the planned processing part (2) of the material (1) is locally induction heated. Further, the induction heating means (81) increases the induction heating temperature of the part (2x) of the material (1) by increasing the amount of current supplied to the coil (81a) and the like (2x). Is locally heated in a semi-molten state.

  The cooling means (85) locally cools the portion (2y) corresponding to the portion on the base end side of the tip (20a) of the guide (20) in the planned processing portion (2) of the material (1). It is. The cooling means (85) has a coolant flow path (85a) provided inside the base end of the guide (20). The cooling means (85) is configured to locally cool the portion (2y) of the material (1) by circulating a coolant such as cooling water in the coolant flow passage (85a). Has been.

  Reference numeral (88) denotes a coolant flow passage provided inside the constraining die (10). The coolant flow passage (88) allows the heat generated by the coil (81a) of the induction heating means (81) to be conducted to other parts of the constraining die (10) by allowing the coolant to flow therethrough. It suppresses.

  The other configuration of the upsetting apparatus (1E) of the fifth embodiment is the same as that of the upsetting apparatus (1C) of the third embodiment.

  Next, an upsetting method using the upsetting apparatus (1E) of the fifth embodiment will be described below.

First, as shown in FIG. 20, the processing planned portion (2) and the non-processing planned portion (3) of the material (1) are inserted and arranged in the constraining hole (11) of the constraining die (10). Thereby, the outer peripheral surfaces of the processing scheduled portion (2) and the non-processing scheduled portion (3) of the material (1) are restrained in a buckling-prevented state by the peripheral surface of the restraining hole (11).
Next, with the mandrel (40) connected to the guide (20) via the fluid pressure cylinder (51), the mandrel body (41) is placed on the non-processed portion (3) of the material (1). Insert and place in the hollow part (3a) and insert and place the small diameter part (42) of the mandrel (40) in the hollow part (2a) of the part to be processed (2) [Set operation of the mandrel (40) ]. By this operation, at least the tip end portion (20a) of the guide (20) is disposed in the hollow portion (2a) of the planned processing portion (2) of the material (1) [setting operation of the guide (20)]. In this state, the inner peripheral surface of the planned processing portion (2) of the material (1) is restrained in a buckling-prevented state by the peripheral surface of the guide (20).

  Furthermore, it is desirable to provide an initial clearance X (see FIG. 12) between the tip (20a) of each guide (20) and the bottom (12a) of the corresponding molding recess (12) as necessary. .

  Furthermore, the material (1) is scheduled to be processed by the coil (81a) of the induction heating means (81) by supplying a current of a predetermined frequency to the coil (81a) of the induction heating means (81) by the power supply unit (81b). The part (2x) corresponding to the tip (20a) of the guide (20) in the part (2) is locally induction-heated. Thereby, the deformation resistance in the said part (2x) of a raw material (1) falls locally.

  In this case, the preferable range of the heating temperature is the same as the preferable range of the heating temperature described in the fourth embodiment.

  Further, the tip of the guide (20) in the planned processing portion (2) of the material (1) is circulated through the coolant flow passage (85a) of the cooling means (85) by circulating coolant such as cooling water at room temperature. The part (2y) corresponding to the part closer to the base end than (20a) is locally cooled. Thereby, the fall of the deformation resistance in the said site | part (2y) of a raw material (1) can be suppressed.

  The preferable range of the cooling temperature in this case is the same as the preferable range of the cooling temperature described in the fourth embodiment.

  In addition, a cooling liquid such as normal temperature cooling water is circulated in a cooling liquid flow passage (88) provided in the constraining die (10). This suppresses the heat generated by the coil (81a) of the induction heating means (81) from being conducted to other parts of the constraining die (10).

  Next, while maintaining such a state, as shown in FIG. 21 and FIG. 22, the planned processing portion (2) of the material (1) by the same procedure as the upsetting method shown in the third embodiment. Is swelled inward so as to increase the thickness in the molding recess (12).

  When the planned processing portion (2) of the material (1) swells to the design shape, the fluid pressure cylinder (51) and the mandrel (40) are then separated and the bottom (15 ) Is removed. Then, the mandrel (40) is extracted from the hollow portion (3a) of the non-processed portion (3) of the material (1), and the guide (20) and the punch (30) are removed. Thereby, the desired cylindrical upsetting product (6C) is obtained.

  In this upsetting method, it is desirable that the average moving speed G from the start of the movement of the guide (20) satisfies the above formula (i).

  Thus, the upsetting method of the fifth embodiment has the same advantages as the upsetting methods of the third and fourth embodiments, and further has the following advantages.

  That is, in the state where the portion (2x) corresponding to the tip (20a) of the guide (20) in the planned processing portion (2) of the material (1) is locally heated, the planned processing portion (2 ) Bulges, the deformation resistance is locally reduced only in the portion (2x) corresponding to the tip (20a) of the guide (20) in the planned processing portion (2) of the material (1). Therefore, the molding pressure can be reduced. On the other hand, since the portion (2y) corresponding to the base end side portion of the guide (20) in the planned processing portion (2) of the material (1) is not heated, the deformation resistance is It does not decline. Therefore, it is possible to prevent an increase in molding pressure caused by the end portion of the material (1) being crushed by the pressing force from the punch (30).

  Furthermore, since the site | part (2x) corresponding to the front-end | tip part (20a) of the guide (20) in the process part (2) of a raw material (1) is induction-heated locally by an induction heating means (81), material (1 ) Can be heated reliably and extremely efficiently.

  Moreover, in this 5th Embodiment, you may carry out induction heating of the said part (2x) of a raw material (1) locally to a semi-molten state by raising induction heating temperature. In this case, the molding pressure can be greatly reduced. In this case, the upsetting process falls within the category of thixo molding.

  Furthermore, the part (2y) corresponding to the part on the base end side of the tip part (20a) of the guide (20) in the planned processing part (2) of the material (1) was locally cooled by the cooling means (85). In this state, since the planned processing part (2) of the material (1) is bulged, the part (2y) of the material (1) can be reliably prevented from being heated, and thus the part of the material (1) A decrease in deformation resistance in (2y) can be reliably suppressed.

  Therefore, according to the upsetting method of the fifth embodiment, as shown in FIG. 22, the bulging portion (4) bulging inward is formed at one axial end portion so as to increase the thickness. High quality cylindrical upsetting products (6C) can be manufactured.

  In the fifth embodiment, the part (2x) corresponding to the tip (20a) of the guide (20) in the planned processing part (2) of the material (1) is locally guided by the induction heating means (81). It is for heating. However, in the present invention, in addition, one axial end portion of the constraining die (10) is locally induction-heated by the induction heating means (81), whereby the portion (2x) of the material (1) is You may heat locally with the heat of the axial direction one end of (10). In this case, the part (2x) of the material (1) can be reliably and efficiently heated. In this case, the constraining die (10) is preferably made of a hard conductive material having heat resistance (eg, heat resistant metal material) such as steel.

  Here, in the fifth embodiment, at the time of upsetting, the guide (20) is moved by the driving force of the guide driving device (60). However, in the present invention, the guide (20) is not necessarily driven as such. It does not need to be moved by force. That is, in the present invention, the guide (20) may be moved by a push-back force that acts on the guide (20) by press-fitting the material (1) into the molding recess (12) of the material (1). good. In this case, the guide (20) can be moved without necessarily using the guide driving device (60), and thus the upsetting device (1E) can be simplified.

  23 to 25 are schematic diagrams for explaining an upsetting method using an upsetting apparatus for a cylindrical material according to a sixth embodiment of the present invention.

  In FIG. 23, (1F) is a tubular material upsetting apparatus according to the sixth embodiment. 23 to 25, the same reference numerals are assigned to the same components as those of the upsetting apparatus (1B) of the second embodiment shown in FIGS. Hereinafter, regarding the configuration of the upsetting apparatus (1F) of the sixth embodiment, the upsetting apparatus (1B) of the second embodiment and the configuration of the upsetting apparatus (1D) of the fourth embodiment will be described. The difference will be mainly described.

  The cylindrical upsetting product manufactured by the upsetting apparatus (1F) of the sixth embodiment is the same as the cylindrical upsetting product (6B) shown in FIG.

  Unlike the upsetting apparatus (1D) of the fourth embodiment, the upsetting apparatus (1F) does not include a mandrel and a telescopic device, as shown in FIG. The upsetting apparatus (1F) includes two heating means (80) and (80), two cooling means (85) and (85), and a pressure fluid filling means (90). .

  The two heating means (80) (80) have the same configuration. Each heating means (80) has the same configuration as the heating means (80) of the upsetting apparatus (1D) of the fourth embodiment, that is, has an induction heating coil (81a) and a power supply unit (81b). Induction heating means (81).

  The two cooling means (85) and (85) have the same configuration. Each cooling means (85) has the same configuration as the cooling means (85) of the upsetting apparatus (1D) of the fourth embodiment, that is, has a coolant flow passage (85a).

  The pressure fluid filling means (90) includes a non-scheduled scheduled portion (3) at the axially intermediate portion of the cylindrical material (1) and a hollow portion (3a) of the planned scheduled portions (2) and (2) at both axial side portions. 2a) (2a) is filled with a pressurized fluid (pressure medium) (95), so that the inner peripheral surface of the non-processed portion (3) and both of the processed portions (2) (2) of the material (1) Is constrained to be in a buckling-prevented state by fluid pressure (that is, pressure of pressure fluid).

  The pressure fluid filling means (90) includes a pressure fluid supply path (91) provided in an axial direction inside one of the punches (30) (30), and the supply A pressure fluid supply section (92) for supplying and filling the pressure fluid (95) into the hollow sections (3a), (2a) and (2a) of the material (1) through the passage (91); The supply port (9a) of the pressure fluid supply path (92) is provided on the front end surface of the punch (30) so as to face the hollow portion (2a). The pressure fluid supply section (92) has a pressure tank (not shown) filled with a pressure fluid inside as a pressure fluid supply source.

  As the pressure fluid (95), for example, a gas such as argon or air is used. However, in the present invention, the pressure fluid (95) is not limited to being a gas, but may be a liquid such as water or oil, for example.

  A fitting convex portion (32) that is fitted into the opening at the axial end portion of the material (1) is integrally provided at the tip portion of each punch (30). This fitting convex part (32) supports the axial direction edge part of a raw material (1) from the inner side, and prevents the deformation | transformation of the said edge part.

  Next, an upsetting method using the upsetting apparatus (1F) of the sixth embodiment will be described below.

  First, as shown in FIG. 23, the non-processed portion (3) of the material (1) is inserted and arranged in the restraining hole (11) of the restraining die (10). Thereby, each process part (2) of a raw material (1) is arrange | positioned in the shaping | molding recessed part (12) to which a restraint die (10) respond | corresponds, respectively. In this state, the outer peripheral surface of the non-processed portion (3) of the material (1) is constrained by the peripheral surface of the constraining hole (11).

  Next, the processing scheduled portion (2) of the corresponding material (1) is inserted and arranged in the insertion hole (21) of each guide (20). Thereby, the outer peripheral surface of each process part (2) of a raw material (1) is restrained by the buckling prevention state by the peripheral surface of an insertion hole (21).

  Furthermore, the corresponding punch (30) is inserted and arranged in the insertion hole (21) of each guide (20). Thereby, each punch (30) is disposed at the initial position on the axial end portion side of the material (1), and the fitting convex portion (32) at the tip of each punch (30) is further moved to the material (1). ) Is fitted into the opening in the axial direction end portion, and the end portion is supported in a deformation-prevented state from the inside by the fitting convex portion (32). Further, the fitting protrusions (32) are fitted in this way, thereby closing the openings at both ends in the axial direction of the material (1).

  Next, the non-processed scheduled part (3) of the material (1) and the hollow parts (3a) (2a) (2a) of both scheduled process parts (2) (2) are pressurized fluid filled by the pressure fluid filling means (90). The pressure fluid (95) is supplied and filled from the supply section (92) through the inside of the pressure fluid supply passage (91). At the time of this filling, it is possible to leave a gap between the opening at one of the axial ends of the material (1) and the tip of the punch (30). 95) is desirable in that the hollow portion (3a) (2a) (2a) of the material (1) can be easily filled in a full state. The filling pressure of the pressure fluid (95) is desirably set within the range of 5 to 50 MPa (particularly preferably 15 to 30 MPa). However, in the present invention, the filling pressure is not limited to the above range, that is, the non-scheduled scheduled part (3) and the both planned scheduled parts (2) (2) of the material (1) are processed during processing. Any filling pressure that does not buckle inward is acceptable.

  Furthermore, it is desirable to provide an initial clearance X (see FIG. 8) between the tip (20a) of each guide (20) and the bottom (12a) of the corresponding molding recess (12) as necessary. .

  Further, by supplying a current of a predetermined frequency to the coil (81a) of each induction heating means (81) by the power supply unit (81b), the constraining die (10) by the coil (81a) of each induction heating means (81) Both end portions in the axial direction are induction-heated locally. As a result, the portion (2x) corresponding to the tip (20a) of the guide (20) in each planned processing portion (2) of the material (1) is localized by the heat at the axial end of the constraining die (10). To be heated. As a result, the deformation resistance at the part (2x) of the material (1) is locally reduced.

  In this case, the preferable range of the heating temperature is the same as the preferable range of the heating temperature described in the fourth embodiment.

  Furthermore, the coolant (85a) of each cooling means (85) is circulated through the coolant flow passage (85a), so that the guide (20) in each processing scheduled portion (2) of the material (1) is circulated. The part (2y) corresponding to the part on the proximal end side with respect to the distal end part (20a) is locally cooled. Thereby, the fall of the deformation resistance in the said site | part (2y) of a raw material (1) can be suppressed.

  The preferable range of the cooling temperature in this case is the same as the preferable range of the cooling temperature described in the fourth embodiment.

  In addition, a cooling liquid such as normal temperature cooling water is circulated in each cooling liquid flow passage (88) provided in the constraining die (10). This suppresses the heat generated by the coil (81a) of each induction heating means (81) from being conducted to other parts of the constraining die (10).

  Next, while maintaining such a state, by the same procedure as the upsetting method shown in the second embodiment, as shown in FIG. 24 and FIG. ) And (2) are simultaneously bulged outwardly so as to increase the thickness in the molding recesses (12) and (12). Note that the fluid pressure in the hollow portions (3a), (2a), and (2a) of the material (1) is kept constant while the both processing planned portions (2) and (2) of the material (1) are expanded. It is desirable to adjust the fluid pressure.

  Then, when both the planned processing parts (2) and (2) of the material (1) bulge into the design shape, the material (1) is then taken out from the restraining hole (11) of the restraining die (10), A cylindrical upsetting product (6B) shown in FIG. 11 is obtained.

  In this upsetting method, it is desirable that the average moving speed G from the start of movement of each guide (20) satisfies the above formula (i).

  Thus, the upsetting method according to the sixth embodiment has the following advantages.

  That is, when pressurizing each processing scheduled portion (2) of the material (1) with the punch (30), the non-processing scheduled portion (3) and the both processing scheduled portions (2) (2) of the material (1). The inner peripheral surface is constrained by fluid pressure, and the outer peripheral surface of the non-processed portion (3) is constrained by the peripheral surface of the constraining hole (11) of the constraining die (10). Therefore, the buckling to the inner side and the outer side of the non-processed portion (3) of the material (1) is prevented, and the buckling to the inner side of each planned processing portion (2) is prevented. Moreover, each process scheduled part (2) of a raw material (1) is arrange | positioned in the insertion hole (21) of a guide (20), and the outer peripheral surface of each process scheduled part (2) is the insertion hole (21). Restrained by the peripheral surface, this prevents buckling to the outside of the planned processing portion (2). In this state, by performing upsetting, each processing scheduled portion (2) of the raw material (1) is reliably and well bulged outward so that the thickness increases in the molding recess (21). As a result, a high-quality cylindrical upsetting product (6B) can be obtained.

  Furthermore, the non-machined part (3) of the material (1) and the hollow parts (3a) (2a) (2a) of the two machined parts (2) (2) are not pressured with a pressure fluid (95 ) Is filled, it is possible to reduce the frictional force acting on each processing scheduled portion (2) of the material (1) during processing. Therefore, the molding pressure can be greatly reduced. Furthermore, there is an advantage that it is not necessary to extract the mandrel from the hollow portion of the upsetting product (6B) after the processing is completed.

  Furthermore, each processing scheduled portion of the material (1) is heated in a state where the portion (2x) corresponding to the tip (20a) of the guide (20) in each processing planned portion (2) of the material (1) is locally heated. Since (2) is bulged, the deformation resistance is locally reduced only in the part (2x) corresponding to the tip (20a) of the guide (20) among the planned processing parts (2) of the material (1). To do. Therefore, the molding pressure can be reduced. On the other hand, among the planned processing parts (2) of the material (1), the part (2y) corresponding to the part on the base end side from the tip part (20a) of the guide (20) is not heated, so deformation resistance Will not drop. Therefore, it can prevent that each edge part of a raw material (1) is crushed and deform | transformed by the applied pressure from a punch (30).

  Furthermore, the both ends of the constraining die (10) in the axial direction are locally induction-heated by the induction heating means (81), whereby the tip end portion of the guide (20) in each processing scheduled portion (2) of the material (1) ( Since the part (2x) corresponding to 20a) is locally heated by the heat at the axial end of the constraining die (10), the part (2x) of the material (1) can be reliably and efficiently heated.

  In the sixth embodiment, the part (2x) of the material (1) may be locally heated to a semi-molten state by increasing the heating temperature. In this case, the molding pressure can be greatly reduced. In this case, the upsetting process falls within the category of thixo molding.

  Further, the part (2y) corresponding to the base end side part of the guide (20) in each planned processing part (2) of the material (1) is locally cooled by the cooling means (85). In this state, since each processing scheduled portion (2) of the material (1) is bulged, it is possible to reliably prevent the part (2y) of the material (1) from being heated. A decrease in deformation resistance at the part (2y) can be reliably suppressed.

  Therefore, according to the upsetting method of the sixth embodiment, a high-quality cylindrical upsetting in which the bulging portions (4) bulging outward are formed on both sides in the axial direction so as to increase the thickness. Processed product (6B) can be manufactured.

  In the sixth embodiment, both ends in the axial direction of the constraining die (10) are induction-heated locally by the induction heating means (81), so that the guides in the planned processing portions (2) of the material (1) The part (2x) corresponding to the tip part (20a) of (20) is heated. However, in the present invention, in addition, the part (2x) of the material (1) may be locally induction heated by the induction heating means (81). In this case, the part (2x) of the material (1) can be reliably and extremely efficiently heated. In this case, the constraining die (10) may be made of a hard conductive material having heat resistance (eg, a heat-resistant metal material) such as a steel material, or a ceramic or the like. Further, it may be made of a hard nonconductive material having heat resistance.

  Moreover, in the said 6th Embodiment, although the number of the process plan parts (2) of the raw material (1) is two, in the present invention, the number of the process plan parts (2) is one in addition. Also good.

  Here, in the sixth embodiment, at the time of upsetting, each guide (20) is moved by the driving force of the guide driving device (60). However, in the present invention, each guide (20) is not necessarily so. It does not need to be moved by a strong driving force. That is, in the present invention, each guide (20) is moved by a push-back force that acts on the guide (20) by press-fitting the material of each planned processing portion (2) of the material (1) into the molding recess (12). May be. In this case, each guide (20) can be moved without necessarily using each guide drive device (60), and thus the upsetting apparatus (1F) can be simplified.

  As mentioned above, although several embodiment of this invention was described, this invention is not limited to what was shown to the said embodiment, A setting change is variously possible.

  For example, the upsetting apparatus according to the present invention is used for manufacturing a preform for a collar member of a bush, a preform for a shaft member of a vehicle arm, or a cylindrical joined member for friction stir welding. It is not limited, and is used to manufacture various product preforms.

  Further, in the present invention, the planned processing portion of the material is located in the intermediate portion in the axial direction of the material. By projecting, the bulging portion may be formed in the intermediate portion in the axial direction of the material.

  In the present invention, the planned processing portion of the material may be processed while the material is heated to a predetermined temperature, or the planned processing portion of the material may be processed without heating the material. That is, the upsetting method according to the present invention may be a hot upsetting method or a cold upsetting method.

  In the present invention, the constraining die and the guide may be divided into a plurality of pieces. Note that the number of divisions and the division positions of the constraining die and the guide are variously set according to the shape of the material and the upsetting product.

  In the present invention, the material may be cylindrical as shown in the above embodiment, or may be, for example, a rectangular tube.

  Further, the present invention is not limited to the heating means (80) being the induction heating means (81), and may be other heating means.

  Next, specific examples of the present invention will be described below. However, the present invention is not limited to that shown in this embodiment.

  A cylindrical material (1) made of an extruded material was prepared. The inner diameter of the material (1) is 30 mm, the outer diameter is 40 mm, and the wall thickness is 5 mm. The length of each processing scheduled portion (2) of the material (1) is 120 mm. The material of the material (1) is an aluminum alloy having an alloy number A6061 in accordance with JIS (Japanese Industrial Standard).

  In Example 1, the material (1) was upset using the upsetting apparatus (1F) of the sixth embodiment by the same method as the upsetting method shown in the sixth embodiment. And the molding pressure required in that case was investigated. The results are shown in Table 1.

  In Example 2, the material (1) was upset using the upsetting apparatus (1D) of the fourth embodiment by the same method as the upsetting method shown in the fourth embodiment. And the molding pressure required in that case was investigated. The results are shown in Table 1.

  In Example 3, the material (1) was upset using the upsetting apparatus (1D) of the fourth embodiment. However, in the present Example 3, the whole raw material (1) was heated and upsetting was performed. And the molding pressure required in that case was investigated. The results are shown in Table 1.

  Here, in Table 1, “restraint means” is means for restraining the inner peripheral surfaces of the non-scheduled scheduled portion (3) and the both planned scheduled portions (2) and (2) of the material (1). In Example 1, a pressure fluid (95) made of argon gas was used as the restraining means. In Examples 2 and 3, the mandrel (40) was used as the restraining means.

  In the “heating mode” column, “local heating” refers to a portion (2x) corresponding to the tip (20a) of the guide (20) in each processing scheduled portion (2) of the material (1) locally. This is when heated. “Whole heating” means that the whole material (1) is heated by a heating furnace, and then the heated material (1) is quickly set in the upsetting apparatus (1D) for upsetting. Is the case.

  In the “cooling” column, “present” means that the cooling means (85) is closer to the proximal end than the distal end portion (20a) of the guide (20) in each processing scheduled portion (2) of the material (1). This is a case where the part (2y) corresponding to the part is locally cooled. “None” means a case where cooling was not performed.

  As shown in Table 1, when the pressure fluid (95) is used as the restraining means (Example 1), the molding pressure is reduced compared to the case where the mandrel (40) is used (Examples 2 and 3). did it.

  In addition, when local heating was performed (Examples 1 and 2), the molding pressure could be reduced as compared with the case where general heating was performed (Example 3).

  This application claims priority from Japanese Patent Application No. 2005-24164 filed on January 31, 2005 and US Provisional Application No. 60 / 649,552 filed on February 4, 2005. Accordingly, the disclosed contents constitute part of the present application as it is.

  The terms and expressions used herein are for illustrative purposes and are not to be construed as limiting, but represent any equivalent of the features shown and described herein. It should be recognized that various modifications within the claimed scope of the present invention are permissible.

INDUSTRIAL APPLICABILITY The present invention can be used for a cylindrical material upsetting method and a cylindrical material upsetting apparatus that can swell the planned processing portion of the cylindrical material inward or outward so that the thickness increases. It is.

Claims (76)

By arranging the mandrel in the hollow part of the processing planned part and the non-processing planned part of the tubular material, the inner peripheral surface of the processing planned part and the non-processing planned part is restrained by the peripheral surface of the mandrel,
By constraining the non-scheduled part of the material in a restraint hole provided in the restraint die so as to extend in the axial direction thereof, the outer peripheral surface of the non-scheduled part is restrained by the peripheral surface of the restraint hole,
And while arranging the processing planned part of the material in the molding recess provided in the axial direction end of the constraining die,
Place the planned processing part of the material in the insertion hole provided in the guide in the axial direction,
Next, while pressing the planned processing portion of the material in the axial direction with a punch, the guide is moved in the direction opposite to the moving direction of the punch so that the thickness of the processing planned portion of the material is increased in the molding recess. A method for upsetting a cylindrical material, characterized by bulging outward.   The tubular material upsetting method according to claim 1, wherein the guide is moved by a driving force of a guide driving device. The average moving speed from the start of punch movement is P,
G, the average moving speed from the start of guide movement
The buckling limit length in the cross-sectional area of the planned processing part of the material before upsetting is X ₀ ,
The initial clearance between the tip of the guide and the bottom of the molding recess is X (where 0 ≦ X ≦ X ₀ ),
The length of the material before upsetting necessary for the bulge is L ₀ ,
A stop position relative to the molded recess bottom portion of the front end portion of the punch is determined from the design volume of the expanded portion X _P,
The stop position of the tip of the guide determined by design relative to the bottom of the molding recess is X _g ,
The time lag from the start of punch movement to the start of guide movement is t ₀ (where 0 ≦ t ₀ ),
Then G is
G = (X _g −X) P / (L ₀ −X _P −Pt ₀ )
The tubular material upsetting method according to claim 1, wherein the following formula is satisfied.   The tubular material upsetting method according to claim 1, wherein the guide is moved by a push-back force acting on the guide by press-fitting the material into the molding recess of the material to be processed. The upsetting method of the cylindrical raw material according to any one of claims 1 to 4, wherein a tip end portion of the punch is formed in a cross-sectional shape corresponding to a cross-sectional shape of an axial end portion of the raw material. 6. The upsetting method for a cylindrical material according to claim 1, wherein a mandrel is connected to the punch in a state of extending in the axial direction of the punch. The mandrel is connected to the punch via an expansion / contraction device that can expand and contract in the axial direction,
The tubular material upsetting method according to claim 6, wherein the telescopic device is shortened as the punch moves. The upsetting of the cylindrical material according to any one of claims 1 to 7, wherein the planned processing portion of the material is bulged in a state where the portion corresponding to the tip portion of the guide in the planned processing portion of the material is locally heated. Processing method.   9. The method for upsetting a cylindrical material according to claim 8, wherein a part of the material to be processed corresponding to the tip of the guide is locally induction-heated by induction heating means.   9. The tubular material according to claim 8, wherein a portion corresponding to the tip end portion of the guide in the material processing scheduled portion is locally heated by locally induction-heating the axial end portion of the constraining die by induction heating means. Upsetting method. The upsetting method according to any one of claims 8 to 10, wherein a part of the material to be processed corresponding to the tip of the guide is locally heated to a semi-molten state. The material processing scheduled portion is bulged in a state in which the portion corresponding to the base end side portion of the guide in the material processing scheduled portion is locally cooled by the cooling means . The upsetting method according to item 1 . By arranging a mandrel in the hollow part of the non-scheduled part of the axial intermediate part of the cylindrical material and the planned part of machining on both sides in the axial direction, the inner peripheral surfaces of the non-scheduled part and both of the planned parts are centered. While restraining with the gold surface,
By constraining the non-scheduled part of the material in a restraint hole provided in the restraint die so as to extend in the axial direction thereof, the outer peripheral surface of the non-scheduled part is restrained by the peripheral surface of the restraint hole,
And both the planned processing parts of the material are arranged in the molding recesses provided at both ends in the axial direction of the constraint die,
Each processing planned portion of the material is arranged in an insertion hole provided in the guide so as to extend in the axial direction,
Next, while simultaneously pressing each planned processing portion of the material in the axial direction with a punch, each guide is moved in a direction opposite to the corresponding moving direction of the punch, thereby corresponding to each processing planned portion of the material. A method for upsetting a cylindrical material, characterized by bulging outward so that the thickness increases in a molding recess. The tubular material upsetting method according to claim 13, wherein each guide is moved by a driving force of a corresponding guide driving device. In at least one of the two guides and the punch corresponding to the guide,
The average moving speed from the start of punch movement is P,
G, the average moving speed from the start of guide movement
The buckling limit length in the cross-sectional area of the planned processing part of the material before upsetting is X ₀ ,
The initial clearance between the tip of the guide and the bottom of the molding recess is X (where 0 ≦ X ≦ X ₀ ),
The length of the material before upsetting necessary for the bulge is L ₀ ,
A stop position relative to the molded recess bottom portion of the front end portion of the punch is determined from the design volume of the expanded portion X _P,
The stop position of the tip of the guide determined by design relative to the bottom of the molding recess is X _g ,
The time lag from the start of punch movement to the start of guide movement is t ₀ (where 0 ≦ t ₀ ),
Then G is
G = (X _g −X) P / (L ₀ −X _P −Pt ₀ )
The method for upsetting a cylindrical material according to claim 13 or 14 , wherein the following formula is satisfied. 14. The method for upsetting a cylindrical material according to claim 13 , wherein each guide is moved by a push-back force acting on the guide by press-fitting the material of the material to be processed corresponding to the material into the molding recess. The upsetting method according to any one of claims 13 to 16, wherein a tip portion of each punch is formed in a cross-sectional shape corresponding to a cross-sectional shape of a corresponding axial end portion of the material. The mandrel is divided into two at its axial middle,
The tubular material upsetting method according to any one of claims 13 to 17, wherein each of the punches is connected to each punch in a state in which a corresponding half of the mandrel extends in the axial direction of the punch. The corresponding mandrel half pieces are connected to each punch via an expansion / contraction device that can expand and contract in the axial direction,
The tubular material upsetting method according to claim 18 , wherein the telescopic device is shortened as each punch moves. The tubular material according to any one of claims 13 to 19, wherein each of the planned processing portions of the material is expanded in a state where the portion corresponding to the tip portion of the guide in each of the planned processing portions of the material is locally heated. Upsetting method. 21. The upsetting method for a tubular material according to claim 20, wherein a portion corresponding to the leading end portion of the guide in each planned processing portion of the material is locally induction heated by induction heating means. 21. The tubular material according to claim 20 , wherein the axially opposite ends of the constraining die are locally heated by induction heating means to locally heat the portion corresponding to the tip of the guide in each processing target portion of the material. Upsetting method. 23. The upsetting method for a cylindrical material according to any one of claims 20 to 22, wherein a part corresponding to the tip of the guide in each planned processing part of the material is locally heated to a semi-molten state. 24. Each of the planned processing portions of the material is swelled in a state where the portion corresponding to the base end side portion of each of the planned processing portions of the material is locally cooled by the cooling means . The upsetting method according to any one of the preceding claims. Preparing a mandrel having a mandrel body and a small diameter portion provided at an axial end of the mandrel body and having a smaller diameter than the mandrel body;
By disposing the mandrel main body in the hollow part of the non-scheduled part of the cylindrical material and the small-diameter part of the mandrel in the hollow part of the planed part, the inner peripheral surface of the non-scheduled part is the peripheral surface of the mandrel body. And forming a molding recess between the inner peripheral surface of the processing scheduled portion and the small diameter portion,
Further, by arranging the planned processing portion and the non-processing planned portion of the material in the constraining hole provided in the restraint die so as to extend in the axial direction, the outer peripheral surfaces of the processing planned portion and the non-processing planned portion of the constraining hole are arranged. While restraining on the circumference,
By placing a guide in the hollow part of the planned processing part of the material, the inner peripheral surface of the planned processing part is constrained by the peripheral surface of the guide,
Next, while pressing the planned processing portion of the material in the axial direction with a punch, the guide is moved in the direction opposite to the moving direction of the punch so that the thickness of the processing planned portion of the material is increased in the molding recess. A method for upsetting a cylindrical material, characterized by bulging inward. The tubular material upsetting method according to claim 25 , wherein the guide is moved by the driving force of the guide driving device. The average moving speed from the start of punch movement is P,
G, the average moving speed from the start of guide movement
The buckling limit length in the cross-sectional area of the planned processing part of the material before upsetting is X ₀ ,
The initial clearance between the tip of the guide and the bottom of the molding recess is X (where 0 ≦ X ≦ X ₀ ),
The length of the material before upsetting necessary for the bulge is L ₀ ,
A stop position relative to the molded recess bottom portion of the front end portion of the punch is determined from the design volume of the expanded portion X _P,
The stop position of the tip of the guide determined by design relative to the bottom of the molding recess is X _g ,
The time lag from the start of punch movement to the start of guide movement is t ₀ (where 0 ≦ t ₀ ),
Then G is
G = (X _g −X) P / (L ₀ −X _P −Pt ₀ )
27. The upsetting method for a cylindrical material according to claim 25 or 26 , wherein the following formula is satisfied. 26. The method for upsetting a cylindrical material according to claim 25, wherein the guide is moved by a push-back force acting on the guide by press-fitting the material into the molding recess of the material to be processed. The upsetting method according to any one of claims 25 to 28, wherein a front end portion of the punch is formed in a cross-sectional shape corresponding to a cross-sectional shape of an axial end portion of the material. The tubular material upsetting method according to any one of claims 25 to 29, wherein the mandrel is connected to the guide in a state of extending in the axial direction of the guide. The mandrel is connected to the guide via an expansion / contraction device that can expand and contract in the axial direction,
The tubular material upsetting method according to claim 30 , wherein the expansion and contraction device is extended as the guide moves. 32. The upsetting of the cylindrical material according to any one of claims 25 to 31, wherein the planned processing portion of the material is bulged in a state in which a portion corresponding to the tip portion of the guide in the planned processing portion of the material is locally heated. Processing method. The method for upsetting a cylindrical material according to claim 32, wherein a portion of the material to be processed corresponding to the tip of the guide is locally induction-heated by induction heating means. 33. The tubular material according to claim 32 , wherein a portion corresponding to the tip end portion of the guide in the material processing scheduled portion is locally heated by locally induction-heating the axial end portion of the constraining die by induction heating means. Upsetting method. The method for upsetting a cylindrical material according to any one of claims 32 to 34, wherein a part of the material to be processed corresponding to the tip of the guide is locally heated to a semi-molten state. 36. The material processing scheduled portion is swelled in a state where the portion corresponding to the portion on the base end side relative to the distal end portion of the guide in the material processing scheduled portion is locally cooled by the cooling means . The upsetting method of the cylindrical raw material of 1 description. A tubular material upsetting apparatus that bulges the processing portion of the cylindrical material outward so that the wall thickness increases,
A mandrel disposed in the hollow portion of the planned processing portion and the non-processing planned portion of the tubular material;
A constraining die having a constraining hole extending in the axial direction, and a non-processed portion of the material disposed in the constraining hole;
A molding recess provided at the axial end of the constraining die; and
A guide having an insertion hole extending in the axial direction, and a processing planned portion of the material being disposed in the insertion hole;
A punch that pressurizes the planned processing part of the material in the axial direction;
With
An upsetting apparatus for a cylindrical material, wherein the guide is movable in a direction opposite to the moving direction of the punch. 38. The tubular material upsetting apparatus according to claim 37, further comprising a guide driving device that moves the guide in a direction opposite to a moving direction of the punch. 39. The tubular material upsetting apparatus according to claim 37 or 38, wherein a front end portion of the punch is formed in a cross-sectional shape corresponding to a cross-sectional shape of an axial end portion of the raw material. The cylindrical material upsetting apparatus according to any one of claims 37 to 39, wherein a mandrel is connected to the punch so as to extend in an axial direction of the punch. 41. The upsetting apparatus for a cylindrical material according to claim 40 , wherein a mandrel is connected to the punch via an expansion / contraction device capable of expanding and contracting in the axial direction. The tubular material upsetting apparatus according to claim 41 , wherein an expansion / contraction device is disposed inside the punch. The tubular material upsetting apparatus according to claim 41 or 42 , wherein the expansion / contraction apparatus includes a fluid pressure cylinder or an axially expandable spring. 44. The upsetting apparatus for a cylindrical material according to any one of claims 37 to 43 , wherein a chamfering process is applied to an edge of the opening of the insertion hole at the tip of the guide. 45. The upsetting apparatus for a cylindrical material according to any one of claims 37 to 44, further comprising a heating means for locally heating a portion of the material to be processed corresponding to the tip of the guide. The heating means is induction heating means,
46. The tubular material upsetting apparatus according to claim 45, wherein a portion of the material to be processed corresponding to the tip of the guide is locally heated by induction heating means. The heating means is induction heating means,
By heating locally induced by the induction heating means in the axial direction end portion of the restraining die, according to claim 45 which is configured to locally heat the portion corresponding to the guide tips in the processing scheduled portion of the raw material The tubular material upsetting apparatus described. 48. The upsetting of the cylindrical material according to any one of claims 45 to 47, wherein the heating means is capable of locally heating a portion corresponding to the leading end portion of the guide in the planned processing portion of the material into a semi-molten state. Processing equipment. 49. The upsetting apparatus according to any one of claims 45 to 48, further comprising a cooling unit that locally cools a portion corresponding to a portion closer to the base end side than the distal end portion of the guide in the planned processing portion of the material. A tubular material upsetting apparatus that bulges the processing planned portions on both sides in the axial direction of the cylindrical material so that the thickness increases.
A mandrel disposed in a hollow portion of a non-scheduled portion of the axially intermediate portion of the cylindrical material and a planed portion of both side portions in the axial direction;
A constraining die having a constraining hole extending in the axial direction, and a non-processed portion of the material disposed in the constraining hole;
Two molding recesses provided at both axial ends of the constraining die;
Two guides each having an insertion hole extending in the axial direction, each of which is planned to be processed in the insertion hole,
Two punches that pressurize each planned processing portion of the material in the axial direction,
With
An upsetting apparatus for a cylindrical material, wherein each guide is movable in a direction opposite to the direction of movement of the corresponding punch. 51. The upsetting apparatus for a cylindrical material according to claim 50, comprising two guide driving devices for moving each guide in a direction opposite to a moving direction of the corresponding punch. 52. The tubular material upsetting apparatus according to claim 50 or 51, wherein a tip portion of each punch is formed in a cross-sectional shape corresponding to a cross-sectional shape of a corresponding axial end portion of the material. The mandrel is divided into two at its axial middle,
53. The upsetting apparatus for a tubular material according to any one of claims 50 to 52, wherein each of the mandrel halves corresponding to each punch is connected in a state extending in the axial direction of the punch. 54. The upsetting apparatus for a cylindrical material according to claim 53 , wherein each of the corresponding half-barrel portions of the mandrel is connected to each punch via an expansion / contraction device capable of expanding and contracting in the axial direction. 55. The tubular material upsetting apparatus according to claim 54, wherein a corresponding expansion and contraction device is arranged inside each punch. 56. The tubular material upsetting apparatus according to claim 54 or 55 , wherein the expansion and contraction device includes a fluid pressure cylinder or an axially expandable spring. The cylindrical material upsetting apparatus according to any one of claims 50 to 56 , wherein a chamfering process is performed on an edge of the opening of the insertion hole at the tip of each guide. 58. The upsetting apparatus for a cylindrical material according to any one of claims 50 to 57, further comprising two heating means for locally heating a portion corresponding to a tip portion of the guide in each planned processing portion of the material. . Each heating means is an induction heating means,
59. The tubular material upsetting apparatus according to claim 58, wherein a portion corresponding to the tip end portion of the guide in each processing scheduled portion of the material is locally induction-heated by induction heating means. Each heating means is an induction heating means,
Claims are configured so as to locally heat a portion corresponding to a tip portion of a guide in each planned processing portion of a material by locally induction heating both axial end portions of the constraining die by induction heating means. 58. The tubular material upsetting apparatus according to 58 . 61. The installation of the tubular material according to any one of claims 58 to 60, wherein each heating means is capable of locally heating a portion corresponding to the leading end portion of the guide in the planned processing portion of the material in a semi-molten state. Machining equipment. 62. The cylinder according to any one of claims 58 to 61, further comprising two cooling means for locally cooling a portion corresponding to a portion closer to the base end side than the distal end portion of the guide in each planned processing portion of the material. Upright processing equipment for shaped materials. A tubular material upsetting apparatus that bulges the processing portion of the cylindrical material inward so that the wall thickness increases.
The mandrel body and the mandrel body are provided at the axial end of the mandrel body and have a smaller diameter portion smaller than the mandrel body. A small diameter part is disposed in each part, and a mandrel that forms a molding recess between the inner peripheral surface of the non-processed scheduled part and the small diameter part,
A constraining die having a constraining hole extending in the axial direction and in which the planned processing part and the non-processing target part of the material are disposed;
A guide arranged in a hollow portion of a planned processing portion of the material,
A punch that pressurizes the planned processing part of the material in the axial direction;
With
An upsetting apparatus for a cylindrical material, wherein the guide is movable in a direction opposite to the moving direction of the punch. 64. The tubular material upsetting apparatus according to claim 63, further comprising a guide driving device that moves the guide in a direction opposite to a moving direction of the punch. The tubular material upsetting apparatus according to claim 63 or 64 , wherein a tip end portion of the punch is formed in a cross-sectional shape corresponding to a cross-sectional shape of an axial end portion of the raw material. 66. Upsetting processing of a cylindrical material according to any one of claims 63 to 65 , wherein a guide is disposed so as to be movable in the axial direction of the punch in a hollow portion that extends in the axial direction inside the punch. apparatus. The cylindrical material upsetting apparatus according to any one of claims 63 to 66, wherein the mandrel is connected to the guide in a state of extending in the axial direction of the guide. 68. The upsetting apparatus for a cylindrical material according to claim 67 , wherein a mandrel is connected to the guide via an expansion / contraction device capable of expanding and contracting in the axial direction. 69. The upsetting apparatus for a cylindrical material according to claim 68 , wherein an expansion / contraction device is disposed inside the guide. 70. The upsetting apparatus for a cylindrical material according to claim 68 or 69 , wherein the expansion and contraction device has a fluid pressure cylinder or a spring that can expand and contract in the axial direction. The cylindrical material upsetting apparatus according to any one of claims 63 to 70 , wherein a chamfering process is performed on a peripheral edge portion of a distal end portion of the guide. 72. The upsetting apparatus for a cylindrical material according to any one of claims 63 to 71, further comprising a heating means for locally heating a portion of the material to be processed corresponding to the tip of the guide. The heating means is induction heating means,
75. The tubular material upsetting apparatus according to claim 72, wherein a portion of the material to be processed corresponding to the tip of the guide is locally heated by induction heating means. The heating means is induction heating means,
72. A portion corresponding to a tip end portion of a guide in a material processing scheduled portion is locally heated by induction heating the axial end portion of the constraining die locally by induction heating means. The tubular material upsetting apparatus described. 75. The upsetting of the cylindrical material according to any one of claims 72 to 74, wherein the heating means is capable of locally heating a portion corresponding to the leading end portion of the guide in the planned processing portion of the material into a semi-molten state. Processing equipment. 76. The installation of a tubular material according to any one of claims 72 to 75, further comprising a cooling means for locally cooling a portion corresponding to a portion closer to the base end side than the distal end portion of the guide in the material processing scheduled portion. Machining equipment.

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