JP3764535B2 - Manufacturing method of flange joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing the flange joint.
[0002]
[Prior art]
As shown in FIG. 12, the manufacturing method of the flange joint 101 which is fitted and fixed to the end of the flow pipe 100 and is connected to the mating part 107 is generally a joint material on a punching die 102 as shown in FIG. The plate material 103 is placed, and a pipe fitting insertion hole 106 is punched into the plate material 103 by a punching punch 105 having substantially the same diameter as the hole 104 of the punching die 102.
[0003]
[Problems to be solved by the invention]
By the way, in the flange joint as described above, it is ideal for reducing the fluid resistance that the inner diameter of the flow pipe 100 and the inner diameter of the communication passage 108 of the mating part 107 are equal as shown in FIG. Also, if both inner diameters are equal, the inner diameter surface 110 of the interposed seal 109 can be positioned on the same plane as both the inner diameter surfaces, so that the seal 109 can be securely clamped. .
[0004]
However, when the pipe fitting insertion hole 106 of the pipe joint is formed by punching with the punch 105 as described above, the following problems occur.
In general, punching of a plate material by a punch is performed through a plastic deformation period shown in FIG. 8 (a), a shearing period shown in (b), and a fracture period shown in (c). An R-shaped sag 111 is formed on the biting side periphery.
[0005]
Therefore, when the plate 103 formed by simply punching the insertion hole 106 as described above is used as the flange joint 101 with the sag 111 portion as the joining side, as shown in FIG. The hole diameter (A portion) at the surface) is larger than the hole diameter (inner diameter) of the fitting insertion hole 106, and the inner diameter of the seal 109 is also increased in accordance with the enlarged hole diameter (A portion) of the sag portion 111. Must. Therefore, when the inner diameter of the communication path 108 in the mating part 107 is matched with the inner diameter of the pipe 100 as shown by the chain line in FIG. 9, a difference in diameter occurs between the inner diameter of the seal 109 and the inner diameter of the mating part 107. Gets worse.
[0006]
On the other hand, with emphasis on sealing performance, if the hole diameter (A part) of the sag portion 111, the inner diameter of the seal 109, and the communication path 108 in the mating part 107 are formed as shown by the solid line in FIG. The hole diameter of 106 and the inner diameter of the pipe 100 must be made smaller than the communication path 108, leading to an increase in fluid resistance.
[0007]
That is, in the flange joint by punching as described above, there is a problem that the reduction of fluid resistance and the securing of sealing properties are contradictory.
To solve this problem, after punching as described above, as shown in FIG. 10, chamfered joining surface of the plate member 103 sags 111 minutes (D ₁ minute 10) in cutting, and to the inner diameter same diameter of the communication passage 108 in the inner diameter and the mating part 107 of the pipe 100, as shown in FIG. 11, the pipe insertion zone the thickness of the pipe 100 ₍₂ min D in FIG. 11) at the cutting Although it is conceivable to increase the diameter, it is impractical to frequently use such costly cutting.
[0008]
Accordingly, the object of the present invention is to provide a flange joint manufacturing method capable of manufacturing a flange joint that achieves both the reduction of fluid resistance and the securing of sealing properties by only plastic processing without cutting. is there.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the first invention described in claim 1 is that a punching hole (8a) is formed by punching (2) in a plate material (8) which is a material of a flange joint, and then the pulling direction thereof. The stepped punch (10) is press-fitted from the opposite direction, and the meat of the taper portion 8d generated at the time of punching is moved to the side of the sag portion (8b) generated at the time of punching to join the plate material (8). A small-diameter hole (19c) having a surface substantially orthogonal to the surface (19b) is formed on the surface (19b) side, and a pipe fitting insertion hole (19e) larger in diameter than the small-diameter hole (19c) on the opposite side to the joint surface (19b). ) Is formed coaxially with the small-diameter hole (19c).
[0010]
According to a second aspect of the present invention, the pipe that is inserted into the pipe insertion hole (19e) has a diameter of the pipe insertion hole (19e) according to the first aspect of the invention that is larger than the diameter of the small diameter hole (19c). This is a method for manufacturing a flange joint having a diameter approximately twice the wall thickness of (20).
[0011]
A third invention according to claim 3, die having a first punch (2), the previous SL diameter of the mold cavity than the outer diameter of the punch (2) (6a) having a predetermined outer diameter (6) In addition to the first press machine (1) consisting of the above, separately from the punch (2), a small diameter part (11a) substantially the same diameter, a large diameter part (11b) larger than the small diameter part (11a), and these From a second punch (11) having a stepped portion (11c) in between, and a lower die (17) having a mold hole (17a) through which the small diameter portion (11a) is inserted with the same diameter as the small diameter portion (11a). the second press (10) used comprised,
A punch hole (8a) is formed in the plate material (8) by the first punch (2) of the first press machine (1), the plate material (8) is turned upside down, and the second A method of manufacturing a flange joint, characterized in that a stepped hole is formed in the flange joint by press-fitting the second punch (11) of the press machine (10) into the punched hole (8a) of the plate member (8). is there.
[0012]
According to a fourth aspect of the present invention, in the flange joint to be molded, the diameter of the die hole (6a) of the die (6) in the invention of the third aspect is set to be larger than the diameter of the first punch (2). This is a method for manufacturing a flange joint having a diameter approximately twice as large as the thickness of the pipe (20) to be inserted.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described based on the examples shown in FIGS.
FIG. 1 shows a first press machine that punches holes in a plate material that is a material of a flange joint.
[0014]
In the first pressing machine 1, reference numeral 2 denotes a first punch, which is fixed to the upper plate 4 via the punch holder 3 and is provided so as to be able to move up and down together with the upper plate 4. The upper plate 4 is fixed to the ram 5 of the press machine by a bolt B _1, and the first punch 2 is lowered together with the upper plate 4 by the lowering of the ram 5. The first punch 2 is formed in a desired cross-sectional shape such as a cylinder or an elliptic cylinder.
[0015]
6A is a die for punching. A die hole 6a having a diameter larger than that of the first punch 2 is formed so as to penetrate the die hole 6a in the vertical direction. The punch 2 is inserted. The inner diameter of the mold cavity 6a is formed to be larger than the first punch 2 by substantially the same thickness as the thickness of the pipe fitted into the formed flange joint. Further, a large-diameter hole 6b concentric with the mold hole 6a and having a diameter larger than that of the mold hole 6a is continuously formed through the tapered hole 6c. The die 6A is fixed to the press bed 6B by bolts B _3.
[0016]
Reference numeral 7 denotes a pressing plate, which is provided on a connecting bolt B ₂ that is suspended from the upper plate 4 so as to be movable up and down. Reference numeral 9 denotes an elastic body made of urethane rubber interposed between the upper plate 4 and the pressing plate 7 and constantly urges the pressing plate 7 downward. Other coil springs or the like may be used as the elastic body 9. A punch insertion hole 7 a having a diameter substantially the same as the diameter of the first punch 2 is formed in the pressing plate 7 so as to be concentric with the first punch 2.
[0017]
The punching process by the first press machine 1 will be described.
First, in a state where the ram 5 is located above the state of FIG. 1 and the holding plate 7 is also raised, a plate material 8 as a material is placed on the die 6 as shown in FIG. Is lowered. When the ram 5 is lowered, the presser plate 7 comes into contact with the plate member 8, and when the ram 5 is further lowered, the elastic body 9 is compressed, and the plate member 8 is held between the presser plate 7 and the die 6 </ b> A by the repulsive force. When the ram 5 is further lowered, the lower end of the first punch 2 comes into contact with the plate material 8 and punching is started. When the first punch 2 is further lowered, the punching is performed, and plastic deformation as shown in FIG. A punched hole 8a as shown in FIG. 2 is formed through a period, a shear period, and a fracture period.
[0018]
Therefore, as shown in FIG. 2, the longitudinal cross-sectional shape of the punched hole 8a is formed at the upper part on the punch insertion side to form an R-shaped sag part 8b, and the top part (small diameter part) 8c of the sag part 8b. 8d is formed in a hole shape in which a diameter is increased downward and a large diameter part 8e is formed at the lower end. The inner diameter and shape of the cross section of the small diameter portion 8c are formed in substantially the same manner as the first punch 2, and the inner diameter and shape of the cross section of the large diameter portion 8e are formed in substantially the same manner as the die hole 6a in the die 6. The
[0019]
FIG. 3 shows a second press machine for plastic working the punched hole 8a.
In the second press 10, reference numeral 11 denotes a second punch, which is located at the lower part and formed with a small diameter part 11 a having the same diameter and the same shape as the first punch 2 in FIG. A large-diameter portion 11b larger than the small-diameter portion 11a and a tapered stepped portion 11c formed therebetween are approximately concentric with each other by approximately twice the wall thickness of the pipe to be inserted into the formed furan joint. It is continuously formed. Note that the angle θ of the step portion 11c is set to be large so that a material volume necessary for removing the sag and forming the step portion, which will be described later, can be obtained. Further, a tapered introduction portion 11d is formed below the small diameter portion 11a. The second punch 11 is fixed to the upper plate 13 via the punch holder 12 and is provided so as to be able to move up and down together with the upper plate 13.
The upper plate 13 is fixed to the ram 14 of the second press machine 10 by bolts B _4, and the second punch 11 is lowered together with the upper plate 13 by the lowering of the ram 14.
[0020]
Reference numeral 15 denotes a pressing plate, which is provided on a connection bolt B ₅ that is suspended from the upper plate 13 so as to be movable up and down. Reference numeral 16 denotes an elastic body made of urethane rubber interposed between the upper plate 13 and the pressing plate 15 and constantly urges the pressing plate 15 downward. As the elastic body 16, other coil springs or the like may be used. A hole 15a is formed in the pressing plate 15 so as to be concentric with the second punch 11 and is substantially the same diameter as the large diameter portion 11b of the second punch 11 and through which the large diameter portion 11b is inserted. Yes.
[0021]
A lower die 17A is located on the same core as the second punch 11 and is formed by penetrating in the vertical direction a die hole 17a having substantially the same diameter and the same cross-sectional shape as the small diameter portion 11a of the second punch 11. The small diameter portion 11a of the second punch 11 is inserted into the mold hole 17a. Lower die 17A is secured to the press bed 7B by bolts B _6.
[0022]
The hole machining by the second press machine 10 will be described.
First, in the state where the ram 14 is positioned above the state of FIG. 3 and the presser plate 15 is also raised, the plate material 8 in which the punching holes 8a are formed by the first press 1 as shown in FIG. The front and back are reversed, that is, as shown in FIG. 3, the sag portion 8b is placed on the lower side, and the punched hole 8a is placed on the lower mold 17 so as to be concentric with the mold cavity 17a.
[0023]
Next, when the ram 14 is lowered, the elastic body 16 is compressed, and the plate material 8 is held between the pressing plate 15 and the lower mold 17A by the repulsive force. When the ram 14 is further lowered to lower the second punch 11, first, the small diameter portion 11a of the second punch 11 passes through the punch hole 8a of the plate material 8, and the outer peripheral surface of the small diameter portion 11a is the top portion 8c of the punch hole 8a. Of the lower mold 17 and the inner peripheral surface of the mold hole 17a.
[0024]
When the second punch 11 is further lowered, the stepped portion 11c passes through the hole 15a of the holding plate 15 and comes into contact with the upper end portion of the tapered portion 8d in the punched hole 8a of the plate material 8, and the stepped portion 11c from this contact point. Pushes and moves the meat of the tapered portion 8d downward (sagging portion 8b side). The pushed meat material flows into the gap between the sag portion 8b and the lower mold 17, and the gap is gradually filled, and at the same time, the outer peripheral surface of the small diameter portion 11a of the second punch 11, the step portion 11c and the large diameter portion. The flow toward the hole center side of the meat material is constrained by the outer peripheral surface of 11b and is gradually shaped.
[0025]
When the descending amount reaches a predetermined amount, the sag portion 8b disappears, and at the same time, a communication hole 19a shaped by the outer peripheral surface of the second punch 11 is formed as shown in FIG.
[0026]
That is, it is orthogonal to the one surface 19b that becomes the joint surface with the mating part, and is orthogonal to the small-diameter hole 19c that has the same diameter as the small-diameter portion 11a of the second punch 11 and the other surface 19d that becomes the pipe connection side surface and the second. A pipe fitting insertion hole 19e formed of a large diameter hole having the same diameter as the large diameter portion 11b of the punch 11, and a tapered portion 19f (stepped portion) having the same shape as the stepped portion 11c of the second punch 11 between the holes 19c and 19e. A flange joint 19 is formed in which a communication hole 19a is formed.
[0027]
The step D ₂ of the small-diameter hole 19c and the pipe insertion hole 19e is substantially equal to the wall thickness of the pipe to be fitted to the flange joint 19.
Then, as shown in FIG. 5, the end 20a of the pipe 20 is inserted into the pipe insertion hole 19e of the flange joint 19 formed as described above. In this fitting state, the small diameter portion 19c has a diameter smaller than the pipe fitting insertion hole 19e by the thickness of the pipe 20, so the circumferential surface 20b of the pipe 20 and the circumferential surface of the small diameter portion 19c in the flange joint 19 are Located on the same plane (same diameter) in the axial direction.
[0028]
Then, after inserting the pipe 20 as described above, the pipe 20 and the flange joint 19 are fixed by welding 21.
Then, as shown in FIG. 6, the flange joint 19 to which the pipe 20 is fixed as described above is provided with a seal 23 interposed in a mating part 22 in which a flow passage 22a having the same diameter as the small diameter portion 19c of the flange joint 19 is formed. Link. At this time, the boundary portion between the joint surface (seal surface) 19b of the flange joint 19 and the inner peripheral surface of the small-diameter portion 19c is formed at a substantially right angle without sagging, and the flow passage 22a on the counterpart component 22 side is also formed. Since the boundary between the inner peripheral surface and the joint surface (seal surface) is naturally formed at a substantially right angle, as shown in FIG. 6, the inner peripheral surface of the small-diameter portion 19c and the flow having the same diameter as this. The seal 23 can be interposed up to the position of the inner peripheral surface of the path 22a. Therefore, good sealing properties can be secured.
[0029]
Moreover, since the inner peripheral surface 20b of the pipe 20, the inner peripheral surface of the small diameter portion 19c of the flange joint 19 and the inner peripheral surface of the flow passage 22a in the mating part 22 are located on substantially the same surface (same diameter) in the axial direction, The flow resistance of the fluid in the joint is reduced.
[0030]
The flange joint manufactured according to the present invention is used as a joint of an intake manifold or an exhaust manifold of an internal combustion engine, or as a joint of a pipe through which a fluid flows.
[0031]
【The invention's effect】
As described above, according to the present invention, the peripheral surface of the end portion on the joint surface side in the hole into which the pipe is inserted is substantially orthogonal to the joint surface, and the inner peripheral surface of the pipe to be inserted and the communication path in the mating part Flange joints that can ensure the sealing performance and reduce the fluid resistance by making the inner peripheral surface of the pipe approximately the same diameter can be formed only by plastic working with a press machine, and easily formed at a lower cost than those that are cut. it can.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first press machine according to the present invention.
FIG. 2 is a longitudinal sectional view of a material showing a punched hole punched by a first press.
FIG. 3 is a sectional view showing a second press machine according to the present invention.
FIG. 4 is a cross-sectional view showing a flange joint plastically processed by a second press machine.
5 is a cross-sectional view in which a pipe is fitted and fixed to the flange joint of FIG. 4;
6 is a cross-sectional view of a flange joint in which the pipe of FIG. 5 is inserted and fixed to be connected to a counterpart component.
FIG. 7 is a view for explaining punching with a conventional punch.
FIGS. 8A, 8B, and 8C are diagrams illustrating a process of punching with a punch.
FIG. 9 is a cross-sectional view showing a connection state of a flange joint only by a conventional punch hole.
FIG. 10 is a cross-sectional view showing a cutting state after forming a conventional punched hole.
11 is a cross-sectional view showing a state in which a hole has been further drilled by cutting in FIG. 10;
FIG. 12 is a diagram illustrating an ideal connection state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... 1st press machine 2 ... 1st punch 6 ... Die 6a ... Mold hole 8 ... Plate material 8a ... Punching hole 10 ... 2nd press machine 11 ... 2nd punch 11a ... Small diameter part 11b ... Large diameter part 11c ... Level difference Part 17 ... Lower mold 17a ... Mold hole 19b ... Joint surface 19c ... Small diameter part 19e ... Pipe fitting insertion hole

Claims (4)

After punching a punch hole in the plate material that is the material of the flange joint, a stepped punch was press-fitted from the direction opposite to the punching direction, and the taper material generated during the punching was generated during the punching. Push and move to the sag portion side to form a small-diameter hole having a surface substantially perpendicular to the joint surface side of the plate material and a pipe fitting insertion hole larger in diameter than the small-diameter hole on the opposite side to the joint surface A method for manufacturing a flange joint, wherein the flange joint is formed coaxially with the flange joint.  2. The method for manufacturing a flange joint according to claim 1, wherein the diameter of the pipe insertion hole is set to be larger than the diameter of the small diameter hole by approximately twice the wall thickness of the pipe inserted into the pipe insertion hole. A first punch having a predetermined outer diameter, a first pressing machine comprising a die having a large diameter of the mold cavity than the outer diameter before Symbol punch, separately, the punch and the small diameter portion of substantially the same diameter as the A second press machine comprising a second die having a large diameter portion larger than the small diameter portion, a second punch having a step portion therebetween, and a mold hole having substantially the same diameter as the small diameter portion and through which the small diameter portion is inserted. Use
A punch hole is formed in the plate material by the first punch of the first press machine, and the plate material is reversed and the second punch of the second press machine is press-fitted into the punch hole of the plate material. flange joint manufacturing method characterized by forming a stepped hole in the flange joints by. 4. The method for manufacturing a flange joint according to claim 3, wherein the diameter of the die hole of the die is larger than the diameter of the first punch by about twice the wall thickness of the pipe inserted into the flange joint to be molded.

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