JP5272499B2 - Pipe material cutting device, ring material manufacturing method, and synchronizer ring material manufacturing method - Google Patents

Description

  The present invention relates to a tube material cutting device, and in particular, a tube material that penetrates a tube to be cut supported from the inside by a mandrel so as to be bridged between a pair of blade bodies, and cuts the tube to be cut by sliding these blade bodies. It relates to a cutting device. The present invention also relates to a method of manufacturing a ring material, a synchronizer ring material, and the like by cutting the tube material with the above-described tube material cutting device.

  Conventionally, pipe materials (cutting pipes) made of long extruded pipes and welded pipes are cut into short pieces, and further intermediate materials to be post-processed, machine parts that are made into products in the cut state, etc. When manufacturing a ring-shaped ring material (ring-shaped material), a long tube material has been cut using a cutting blade or a grinding blade. For example, when manufacturing a ring-shaped synchronizer ring forging material (synchronizer ring material), which is a part of a transmission used for automobiles, by cutting a tube material consisting of a long extruded tube, a long tube The material was fixed on a lathe, rotated, and cut with a parting tool.

By the way, the above-mentioned tube cutting device that cuts a tube material with a cutting blade or a grinding blade has the disadvantages that material loss is generated by the thickness of the blade and that the processing time is long and the productivity is low. . As a tube material cutting device that solves these drawbacks, a tube material cutting device that has a fixed blade and a rotating blade, penetrates the tube material between the fixed blade and the rotating blade, and eccentrically rotates the rotating blade to cut the tube material is proposed. (See Patent Documents 1 to 5). In the tube cutting apparatus having the fixed blade and the rotary blade, when the tube material is penetrated between the fixed blade and the rotary blade and the rotary blade is eccentrically rotated, the pipe material is subjected to a shearing action at a contact portion of the fixed blade and the rotary blade. Since it receives and is cut | disconnected, it has the characteristics that there is no loss of the material accompanying a cutting | disconnection, and processing time can be shortened.
Further, when the pipe material is cut by the pipe material cutting device having the fixed blade and the rotary blade, a mandrel that supports the pipe material from the inside is used inside the pipe material (see Patent Document 3). By using this mandrel, the accuracy of the cut surface can be increased.
JP-A-53-24192 JP-A-7-16813 JP-A 63-52916 JP-A-8-90328 Japanese Patent Application Laid-Open No. 8-112716

  However, in the tube material cutting apparatus that cuts the tube material by passing between the fixed blade and the rotary blade with the mandrel interposed inside, the mandrel is in close contact with the inside of the tube material without any gap. Otherwise, the unevenness of the cut surface becomes large, which causes a reduction in quality. In particular, when there is a variation such as uneven thickness in the dimensions of the tube material, it is difficult to restrain the inner peripheral surface uniformly, and there is a limit to improving the accuracy of the cut surface.

  The present invention has been proposed in view of the above circumstances, and even if there is uneven thickness or the like in the tube to be cut, the mandrel can be uniformly adhered to the inner peripheral surface without a gap, and the cutting accuracy can be improved. It aims at providing the manufacturing method of a pipe material cutting device, a manufacturing method of a ring material, and a synchronizer ring material.

The pipe material cutting device of the present invention is inserted into a die hole of a set of blade bodies whose surfaces are slidably in contact with each other so that a tube to be cut with a mandrel interposed inside is bridged between both blade bodies, A tube material cutting device for cutting the tube to be cut by sliding both blade bodies, wherein the mandrel includes a cylindrical body having an outer diameter smaller than an inner diameter of the tube to be cut, and an axial direction in the cylindrical body. An elastic core member that can be elastically deformed in the radial direction by a plurality of split slits that open to the distal end surface and extend in the length direction at the distal end portion of the cylindrical body. A plurality of pieces are formed at intervals in the circumferential direction and integrated with each other, and the inner peripheral surfaces of these elastic pieces are formed as tapered surfaces that taper toward the tip of the inner diameter of the cylindrical body, and the core member , the tape that contacts the tapered surface of the elastic piece A diameter member which is advanced and retracted in the axial direction provided with a surface, and a pressing member for pressing the the enlarged diameter member from the rear, with respect to the axial direction diameter member between these enlarged diameter member and the pressing member And a spherical seat that is swingably supported.

  The tube material cutting device configured as described above inserts a tube to be cut so as to span the die holes of both blade bodies, inserts a mandrel inside the tube to be cut, and expands the diameter by a pressing member of the mandrel. When the member is pressed, the diameter-expanding member presses the tapered surface of the cylindrical member, pushes each elastic piece outward in the radial direction, and constrains the inner peripheral surface of the tube to be cut by these elastic pieces. In this constrained state, the tube to be cut is cut by sliding both blades. In this case, the tip of the cylindrical body of the mandrel is divided into a plurality of elastic pieces, and the diameter-expanding member that pushes the elastic pieces from the inside is supported by the spherical seat so that it can swing freely. Even when a partial thickness deviation or the like occurs in the tube, each of the elastic pieces can follow the thickness deviation or the like of the tube to be cut while the diameter-expanding member swings along the spherical seat. it can. On the other hand, after the end of cutting, each elastic piece can be reduced in diameter by releasing the pressing state by the diameter-expanding member, so that the mandrel can be easily pulled out from the tube to be cut.

Moreover, the manufacturing method of the ring material of this invention is characterized by manufacturing a ring-shaped ring material by cut | disconnecting a pipe | tube raw material in short length using the above-mentioned pipe material cutting device.
According to the method for manufacturing a ring material of the present invention, a tube material can be easily and accurately cut. For example, an intermediate material that is further processed after cutting, or a ring-shaped product such as a machine part that is a product in a cut state. The quality of the ring material is improved and the manufacturing cost is reduced.
In addition, the method for manufacturing a synchronizer ring material according to the present invention is characterized in that a ring-shaped synchronizer ring material is manufactured by cutting the tube material into a short length using the above-described tube material cutting device.
According to the method of manufacturing a synchronizer ring material of the present invention, a pipe material can be cut easily and accurately, and the quality of a ring-shaped synchronizer ring material, which is a part of a transmission used in, for example, an automobile, can be improved. Cost is reduced.

  In the pipe material cutting device according to the present invention, the ring material using the same, and the method for manufacturing the synchronizer ring material, the tip of the cylindrical body of the mandrel is divided into a plurality of elastic pieces, and the elastic pieces are spread from the inside. Since the diameter-expanding member is supported by the spherical seat so as to be swingable, the diameter-expanding member swings along the spherical seat even when a partial thickness deviation or the like occurs in the tube to be cut. However, each elastic piece can be made to follow the uneven thickness of the tube to be cut. Therefore, even if the tube to be cut is uneven, the elastic piece can be uniformly brought into contact with the inner surface of the tube so as to be surely constrained, thereby enabling high-precision cutting.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a pipe cutting device according to an embodiment of the present invention. The pipe cutting device includes a fixed blade 1 for applying a shearing force to a cut pipe P, and a rotary blade. The rotary blade body 20 housed in the holder 10 and the mandrel 30 for restraining the cutting pipe P to be cut between the two blade bodies 1 and 20 inside the fixed blade body 1 and the cutting pipe inside the rotary blade body 20. It is set as the structure provided with the restraint tool 50 which restrains the front-end | tip part of P. As shown in FIG.

  As shown in FIG. 3, the fixed blade body 1 is made of a steel block body. One surface 1 a of the fixed blade body 1 (in the example shown in FIG. 3, the front surface of the fixed blade body 1, (Corresponding) is formed on a flat surface having high slipperiness. In the illustrated example, one surface 1a of the fixed blade body 1 is formed in a vertically long rectangle. Then, a position slightly upper left from the center position of the one surface 1a (position indicated by “O” in FIG. 3), that is, a position in the second quadrant with respect to the center point O of the one surface 1a of the rectangle is defined as the center Os. A first die hole 2 formed of a circular hole perpendicular to the one surface 1a is opened. The first die hole 2 is configured such that the diameter of the circular hole is set smaller than the outer diameter of the tube to be cut P, and a binding force is generated by press-fitting the tube to be cut P. The inner peripheral edge of the open end on the one surface 1a is a cutting edge. Further, the opening end of the first die hole 2 opposite to the cutting edge is chamfered such as C chamfering or R chamfering, and this opening end is used as the insertion port 1b of the cut pipe P. ing.

  The size of the one surface 1a of the fixed blade body 1 and the thickness of the fixed blade body 1 are determined so as to sufficiently withstand the force when shearing the tube P to be cut. Further, the fixed blade body 1 is fixed to a casing (not shown) of the pipe material cutting device. When the fixed blade 1 is fixed to the casing, a bolt, a clamp, or the like for fixing is provided on the rotary blade holder so that a rotary blade holder 10 to be described later can freely move vertically on one surface 1a of the fixed blade 1. It is arrange | positioned in the position which does not prevent 10 movement.

The rotary blade holder 20 is made of a steel block, and one surface 10a of the rotary blade holder 10 (the back surface of the rotary blade holder 10 in the example shown in FIG. 3) is formed on a flat surface having high slipperiness. Yes. In the illustrated example, the shape of the one surface 10 a of the rotary blade holder 10 is square, and the length of one side thereof is the same as the short side of the one surface 1 a made of a rectangle of the fixed blade body 1. Then, the center position of the one surface 10a, i.e., at a position passing through the center point of a square one side 10a (see "O _H" in FIG. 3), the rotary blade body comprising a circular hole around the center point O _H A storage hole 11 is opened at a right angle to the surface 10a. The diameter of the rotary blade housing hole 11 is set sufficiently larger than the diameter of the first die hole 2. Further, the thickness of the rotary blade holder 10 is determined so that it can sufficiently withstand the force when the cut pipe P is sheared. Furthermore, on one surface 10a side of the rotary blade holder 10, there is formed a pressure receiving surface 10b that expands the diameter of the rotary blade housing hole 11 and receives a flange 20b of the rotary blade body 20 described later in the axial direction.

  The rotary blade holder 10 has a guide frame (not shown) so that the one surface 10a of the rotary blade holder 10 contacts the one surface 1a of the fixed blade body 1 and can move only in the vertical direction of the fixed blade body 1. It is slidably attached to. That is, the rotary blade holder 10 is configured so that both sides thereof are supported by parallel guide frames in FIG. 3 and can move up and down between the guide frames. The rotary blade holder 10 is configured to be moved along the guide frame by a hydraulic cylinder or a mechanical press.

Further, the rotary blade body 20 is formed in a size that can be inserted into the rotary blade body accommodation hole 11 provided in the rotary blade holder 10 so as to be freely rotatable without a gap. That is, the rotary blade body 20 is formed in a stepped cylindrical shape having a diameter slightly smaller than the inner diameter of the rotary blade body housing hole 11 and a height (thickness) equal to the thickness of the rotary blade holder 10. The one surface 20a (in the example shown in FIG. 3, which is the back surface of the rotary blade 20 and corresponds to the surface of the present invention) is formed on a flat surface having high slipperiness, and on this one surface 20a side, the surface to be cut In order to receive the axial force generated when the tube is sheared with the pressure receiving surface 10b of the rotary blade holder 10, the flange 20b is formed integrally.
A circular second die hole 21 into which the tube to be cut P is inserted is formed in the rotary blade body 20. The diameter of the second die hole 21 is the same as that of the first die hole 2 provided in the fixed blade body 1 and is set smaller than the outer diameter of the tube to be cut P. When P is press-fitted, a binding force is generated, and the inner peripheral edge of the open end on the one surface 20a is a cutting edge.

In this case, the axis Oc of the second die hole 21 is slightly offset from the center point O _H toward the second quadrant of the rotary blade body accommodating hole 11 of the rotary blade holder 10 (or the outer shape of the rotary blade body 20) The eccentric distance L is set to be the same as the eccentric distance L between the center point O of the fixed blade 1 and the axis Os of the first die hole 2. Therefore, when the rotary blade 20 is stored in the rotary blade storage hole 11 of the rotary blade holder 10, the axis Oc of the second die hole 21 in the rotary blade 20 and the first in the fixed blade 1. This is a configuration in which the axial center Os of the die hole 2 can be made the same axial center. Then, by aligning the axial centers Oc, Os of the die holes 2, 21 of the both blade bodies 1, 20, it is possible to insert the tube P to be cut between the die holes 2, 21. It has become.

4A and 4B are explanatory views showing a return mechanism for automatically returning the rotary blade body 20 in the rotary blade holder 10 to the initial position. In the illustrated example, the tension spring 12 and the stopper are shown. 13 and the pin 22 constitute a return mechanism 30.
As will be described in detail later, the rotary blade body 20 is a timepiece when the rotary blade holder 10 is moved downward from the state shown in FIG. 4A to the state shown in FIG. It is rotated by a predetermined angle passively in the direction. After the cut tube body is discharged, the rotary blade body 20 is returned by the tension spring 12 until the pin 22 contacts the stopper 13, and the fixed blade body 1 and the rotary blade body 20 shown in FIG. In this state, the axial centers Os and Oc of the two die holes 2 and 21 coincide with each other, that is, return to the initial position for positioning.
As the return mechanism, a mechanism using a cam, a spring, hydraulic pressure, or the like may be used.

On the other hand, the mandrel 30 is provided in the first die hole 2 of the fixed blade body 1, and an enlarged view thereof is shown in FIG.
The mandrel 30 includes a cylindrical body 31 and a core member 45 for expanding the diameter provided in the cylindrical body 31 so as to be movable in the axial direction. The cylindrical body 31 is formed so that the outer diameter is slightly smaller than the inner diameter of the cut pipe P and has a length larger than the thickness of the fixed blade body 1. In the cylindrical body 31, a plurality of vertically divided slits 32 are provided at a tip portion disposed in the first die hole 2 opened in the fixed blade body 1.
These longitudinal slits 32 extend in the length direction of the cylindrical body 31 and are provided so as to divide the circumference of the cylindrical body 31 at equal intervals. A piece 33 is formed. Further, the inner surface of these elastic pieces 33, in other words, the inner peripheral surface of the tip portion of the cylindrical body 31 formed by these elastic pieces 33, is a tapered surface 33a that tapers toward the tip (left side in the illustrated example). Is formed.

  A diameter-expanding member 34 is provided inside the tapered surface 33a so as to be movable in the axial direction of the cylindrical body 31 so as to close the hollow portion surrounded by the tapered surface 33a with a stopper. The diameter-expanding member 34 is formed on a tapered surface 34 a whose tip end surface is tapered in accordance with the tapered surface 33 a of the cylindrical body 31. Therefore, when the diameter-expanding member 34 is moved in the direction of the tip of the cylindrical body 31, the elastic pieces 33 of the cylindrical body 31 are expanded from the inside and bent outward from the radius, whereby the diameter of the entire cylindrical body 31 is increased. Can be expanded.

  A pressing member 36 is connected to the rear end of the diameter expanding member 34 via a joint mechanism 35. The joint mechanism 35 has a configuration in which a spherical ball 37 is sandwiched between a pair of ball pressers 38 and 39, and the contact surface of each ball presser 38 and 39 with the ball 37 is engaged with the outer surface of the ball 37. Spherical seats 38 a and 39 a are formed, and the ball pressers 38 and 39 are spaced apart from each other by a small distance on the outside of the ball 37, so that the ball can swing freely around the ball 37. .

The pressing member 36 is in contact with the rear end of the rear ball retainer 39. The pressing member 36 is formed in a rod shape, and is connected to an advancing / retreating mechanism 42 such as a hydraulic cylinder through a cap member 41 provided at a rear end portion of the cylindrical body 31.
That is, when the ball presser 39 is pressed from the rear via the pressing member 36, the diameter expanding member 34 is pressed forward from the ball press 39 via the ball 37, the front ball press 38, and the compression spring 40, When the tapered surface 34a of the diameter-expanding member 34 enters the wedge shape in the distal direction of the cylindrical body 31, the tapered surface 33a of each elastic piece 33 of the cylindrical body 31 is pressed from the inside, and each elastic piece 33 is radiused. The diameter expanding member 34, the compression spring 40, the ball pressers 38 and 39, the ball 37, the pressing member 36, and the advance / retreat mechanism 42 constitute the diameter increasing core member 45. In this case, the diameter-expanding member 34 is always kept in a state of pressing the elastic piece 33 outward with a predetermined biasing force.

  A small-diameter portion 38b is formed at the front end portion of the front ball retainer 38. The small-diameter portion 38b is slidably inserted into a guide hole 34b formed in the rear end portion of the diameter-expanding member 34, and the guide hole 34b The compression spring 40 is housed inside. The compression spring 40 prevents the joint mechanism 35 from rattling. Also, a guide hole 39b is formed in the rear end portion of the rear ball retainer 39, and the tip end portion of the pressing member 36 is slidably inserted into the guide hole 39b.

On the other hand, the restraining tool 50 is provided in the second die hole 21 of the rotary blade body 20 so as to restrain the distal end portion of the tube P to be cut supported by the mandrel 30. Similar to the mandrel 30, the restraint 50 has a cylindrical body 53 in which a plurality of elastic pieces 52 are formed by vertical slits 51 at the tip. A large-diameter portion 54 is formed at the distal end of the cylindrical body 53 on which the elastic piece 52 is formed, and the distal end portion of the tube P to be cut is constrained by the outer peripheral surface of the large-diameter portion 54. Further, the inner surfaces of these elastic pieces 52 are formed on a tapered surface 52 a that gradually increases in diameter toward the tip of the cylindrical body 53.
A diameter-expanding member 55 is provided on the inner side of the cylindrical body 53 so as to be movable in the axial direction of the cylindrical body 53, and the diameter-expanding member 55 corresponds to the tapered surface 52 a of the cylindrical body 53. A tapered surface 55a is formed and pulled from the rear by an advancing / retreating mechanism 56 such as a hydraulic cylinder, whereby each elastic piece 52 of the cylindrical body 53 can be pushed radially outward from the inside.

Next, an operation for cutting the pipe P to be cut by the pipe cutting apparatus according to the present embodiment and a method for manufacturing the ring material and the synchronizer ring material by the operation will be described.
First, a position where the axial centers Os and Oc of the die holes 2 and 21 of the fixed blade body 1 and the rotary blade body 20 coincide (position shown in FIGS. 1 and 4A) is set as an initial position. In FIG. 6, the tube P to be cut is inserted so as to be bridged over both the die holes 2 and 21 as shown in FIG. At this time, in the portion inserted into the fixed blade body 1, the mandrel 30 is disposed inside the tube to be cut P, and a restraining tool is placed inside the tip portion of the tube to be cut inserted into the rotary blade body 21. 50 is arranged. Then, the elastic pieces 33 and 52 of the cylindrical bodies 31 and 53 in the mandrel 30 and the restraining tool 50 are spread outward in the radial direction, and the cut pipe P is fixed to the both blade bodies 1 and 20.

When the rotary blade holder 10 is moved downward from the initial position, the rotary blade body 20 accommodated in the rotary blade holder 10 is moved linearly downward and rotated in the accommodation hole 11 described above. And the combined movement occurs.
5 shows the axis Os of the first die hole 2 of the fixed blade body 1 and the axis O of the storage hole 11 of the rotary blade holder 10 (that is, the rotary blade body 20 stored in the storage hole 11). _H and the movement of the axis Oc of the second die hole 21 of the rotary blade body 20 are indicated by arrows, respectively.

First, the position indicated by the axis Oc (Os) is the initial position. From this initial position, if only the downward moving component of the rotary blade holder 10 is captured, the rotary blade holder 10 moves downward. The axis Oc of the second die hole 21 also moves downward as indicated by an arrow (A). On the other hand, the axis O _H rotary blade holder 10 and the axis Oc of the second die hole 21 have eccentric, it is in the second die hole 21 put on the first die hole 2 of the fixed cutter blade 1 since the cutting tube P to be passed is in the inserted state, to said second die hole 21, clockwise as shown by an arrow (b) about the axis O _H rotary blade holder 10 Force to rotate is applied. Since the rotary blade body 20 having the second die hole 21 is rotatably stored in the storage hole 11 of the rotary blade holder 10, it is rotated in the direction indicated by the arrow (b) by the clockwise force. It is done.

Rotational movement indicated by the arrow (b), the mobile will be made until completion from the start of the movement of the downward rotary blade holder 10, the axis of the rotary blade holder 10 from the O _H to O _{H '} In the meantime, the axial center of the rotary blade 20 also moves in both directions indicated by the arrows (A) and (B) from Oc, and eventually moves to the position of Oc ′.

  As a result of this series of movements, the cut pipe P that has been inserted so as to be bridged over the two die holes 2, 21 has two portions inserted into the second die hole 21 of the rotary blade 20. It is moved as indicated by the chain line, and sheared by the cutting edges at the open ends of both die holes 2 and 21 (see FIG. 7). At this time, since the cutting tube P is sheared while the rotary blade 20 rotates, the shearing portion is cut while being gradually shifted in the circumferential direction of the cutting tube P, and cutting is performed with a relatively small force. As shown in FIG. 5, it becomes possible to cut the tube P to be cut by rotating θ = several degrees.

  FIG. 8 shows a state where the rotary blade 20 is returned to the initial position again after the cut pipe P is cut and the pipe P ′ is generated. FIG. 9 shows a state in which the cut tube P ′ is discharged from the rotary blade 20 using the restraining tool 50. When discharging the tubular body P ′, the rotary blade holder 10 and the rotary blade body 20 move rearwardly away from the fixed blade body 1 to open the front surface of the rotary blade body 20. At that time, the distal end portion of the restraining tool 50 is protruded from the second die hole 21 of the rotary blade body 20 so that the outer side of the tube body P ′ fitted to the rotary blade body 20 is opened and restrained. When the elastic member 52 is restored by moving the diameter expanding member 55 of the tool 50, the restrained state inside the tube P 'is also released and can be discharged as shown in the figure. After the tube P ′ is discharged, the rotary blade holder 10 and the rotary blade body 20 are brought into contact with the fixed blade body 1 and returned to the initial position.

As described above, in the method for manufacturing the pipe material cutting device and the ring material and the synchronizer ring material according to the present embodiment, each mandrel 30 supporting the inside of the pipe to be cut P is divided by the vertical slits 32. Since the tube to be cut P is restrained while pressing the elastic piece 33 against the inner peripheral surface of the tube to be cut P, each of the elastic pieces is copied so as to follow even if uneven thickness or the like occurs in the tube to be cut P. 33 can be brought into close contact with the tube P to be cut.
Further, the mandrel 30 has a configuration in which a ball 37 is interposed between the diameter-expanding member 34 at the tip and the rear pressing member 36 and is supported by the spherical seats 38a and 39a of the ball pressers 38 and 39. The diameter-expanding member 34 can be swung along the spherical seats 38a and 39a, and the elastic piece 33 can be more reliably brought into contact with the tube P to be finished to have a highly accurate cut surface.

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change. For example, although the spherical seat of the mandrel is formed on both the diameter-expanding member side and the pressing member side, it may be formed on either one. In that case, instead of using a single ball, a hemispherical portion may be integrally formed on the diameter expanding member side or the pressing member side, and a spherical seat may be integrally formed on the other side. In the above-described example, the rotary blade body 20 is passively rotated by linear movement. However, a configuration in which a mechanism for rotating the rotary blade body 20 is separately provided is not excluded.

  Moreover, the to-be-cut pipe P demonstrated by this embodiment is a pipe raw material which consists of a long extruded pipe, a welded pipe, etc., for example, and pipe body P 'cut | disconnects the said pipe | tube raw material shortly and further post-processes. It may be a ring-shaped ring material (ring-shaped material) such as an intermediate material to be applied or a machine part that is cut into a product. Alternatively, the tube P to be cut is a tube material made of a long extruded tube, and the pipe body P ′ is manufactured by cutting the tube material into a short length and is a ring-shaped part of a transmission used for an automobile or the like. It may be a material for forging of a synchronizer ring (synchronizer ring material). Moreover, these ring materials and synchronizer ring materials are not limited to the above-mentioned applications, and can be manufactured and used according to various demands and applications.

It is a longitudinal section of a pipe material cutting device concerning one embodiment of the present invention. It is the enlarged view which showed the upper half of the mandrel in FIG. 1 in the cross section. It is a disassembled perspective view of a fixed blade body, a rotary blade holder, and a rotary blade body among the pipe material cutting devices of this embodiment. In the pipe material cutting device of this embodiment, it is a front view showing movement of a rotary blade in a rotary blade holder in order of (a) and (b). It is a schematic diagram which shows the motion of each axial center of the both die hole shown in FIG. 4, and the accommodation hole of a rotary blade holder. It is a longitudinal cross-sectional view which shows the state which inserted the to-be-cut tube in the pipe material cutting device shown in FIG. It is a longitudinal cross-sectional view which shows the state which cut | disconnected the to-be-cut tube from the state shown in FIG. It is a longitudinal cross-sectional view which shows the state returned to the initial position from the state shown in FIG. It is a longitudinal cross-sectional view which shows the state which spaced apart both blade bodies from the state shown in FIG. 8, and is discharging | emitting the cut tube from a rotary blade body.

Explanation of symbols

1 Fixed blade 1a One side (surface)
DESCRIPTION OF SYMBOLS 1b Insertion slot 2 1st die hole 10 Rotary blade holder 10a One surface 11 Rotary blade body accommodation hole 20 Rotary blade body 20a One surface (surface)
21 Second die hole 25 Return mechanism 30 Mandrel 31 Cylindrical body 32 Vertical slit 33 Elastic piece 33a Tapered surface 34 Diameter increasing member 34a Diameter increasing member 35 Joint member 36 Pressing member 37 Ball 38, 39 Ball presser 38a, 39a Spherical seat 40 Compression spring 45 Core member for diameter expansion 50 Restraint P Pipe to be cut (tube material)
P 'tube (ring material, synchronizer ring material)
The axis of the axis O _H rotary blade body accommodating hole of the Os first die hole axis Oc second die hole (or rotary blade body)

Claims (3)

By inserting a tube to be cut with a mandrel inside on a die hole of a set of blades whose surfaces are slidably in contact with each other, and sliding both blades A pipe material cutting device for cutting the pipe to be cut,
The mandrel includes a cylindrical body having an outer diameter smaller than the inner diameter of the tube to be cut, and a diameter expanding core member provided in the cylindrical body so as to be movable in the axial direction.
The distal end portion of the cylindrical body, together with an elastically deformable elastic piece in the radial direction are formed in plurality at intervals in the circumferential direction by a plurality of vertical divisions extending slits opening to the length direction of the distal end surface are integrated, the inner peripheral surfaces of the elastic pieces is formed on the tapered surface tapered toward the distal end of the inner diameter of the cylindrical body,
Wherein the core member comprises a radially enlarged member which is advanced and retracted in the axial direction provided with a tapered surface abutting the tapered surface of the elastic piece, and a pressing member for pressing the the enlarged diameter member from the rear,
A tubular material cutting device characterized in that a spherical seat is formed between the diameter-expanding member and the pressing member to support the diameter-expanding member so as to be swingable with respect to the axial direction.   A method for producing a ring material, comprising: using the pipe material cutting device according to claim 1 to produce a ring-shaped ring material by cutting a tube material into short pieces.   A method for producing a synchronizer ring material, comprising: producing a ring-shaped synchronizer ring material by cutting the tube material into short pieces using the pipe material cutting device according to claim 1.

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