JPH11156456A - How to control drooping in punching - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the generation of depression by achieving the swaging in advance in the vicinity of a part to be punched, and punching a part slightly close to a thicker part from a thinned part. SOLUTION: The outer circumferential part of a ring-shaped member A punched from a stock is swaged to obtain a swaged article B. An outer circumferential part of the swaged article B is swaged and thinned from the original thickness of t1 to the thickness t3. The range to be swaged is a part slightly larger than the final outside diameter D1, i.e., an outside part of D1+ΔD. The part to be finally punched is a part slightly closer to a thick part from the swaged and thinned part. The part to be swaged of the swaged article B is punched at the position of the diameter D1 to be a final article. It is preferable to provide an inclination so that the thickness is reduced toward the part to be punched, and the inclination side is the punching punch side during the punching.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for suppressing drooping in punching, and more particularly to a method suitable for manufacturing a backing plate for a clutch device or a brake device in an automatic transmission for a vehicle.

[0002]

2. Description of the Related Art FIG. 5 illustrates a conventional technique. First, a raw material, that is, a coil material or a fixed-size material is punched with a mold attached to a press machine to obtain a ring-shaped member. At this time, as shown in FIG. 6, the outer periphery of the ring-shaped member is drooped. This person is represented by X or Y in FIG.

[0003] The above-mentioned who depends on the hardness of the material and the clearance of the mold, that is, the clearance between the punch and the die. That is, the lower the hardness of the material and the greater the clearance of the mold, the greater the size.

[0004] Generally, in an automatic transmission for a vehicle, a clutch device and a brake device, which are wet-type multi-plate frictional engagement devices, are used to perform a gear shift.
One example of these devices is shown in cross section in FIG. The wet multi-plate friction engagement device 100 includes a hydraulic piston 101, a group of friction plates 102 pressed by the hydraulic piston 101, and a drum 104 that is a cylindrical member that houses the friction plates. The friction plate group 102 includes a plurality of first friction plates 102a that are spline-fitted to the hub 103, and a drum 1
04, the plurality of second friction plates 102 spline-fitted to each other
b, the first friction plate 102a and the second friction plate 102a
Are arranged alternately in the axial direction. Further, a hydraulic chamber 105 is formed between the hydraulic piston 101 and the drum 104, and the hydraulic piston 101 is urged rightward in the figure by a return spring 106. When pressure oil is supplied to the hydraulic chamber 105, the hydraulic piston 101 returns to the return spring 10
6 to the left against the urging force of the friction material group 10
Press 2. A backing plate 107 is provided on the opposite side of the friction plate group 102 from the hydraulic piston 101. The backing plate 10
Numeral 7 is accommodated in the drum 104 together with the friction plate group 102, and movement in the axial direction is restricted by a snap ring 108 locked to the drum 104, and receives the pressing force of the hydraulic piston 101. Therefore, the friction plate group 102 is pressed between the hydraulic piston 101 and the backing plate 107, and the hub 103
And the drum 104 are integrally engaged. As described above, since the backing plate 107 is a member to which pressure is applied, when any of the backing plates 107 is generated on the outer peripheral side of the backing plate 107 that forms the spline teeth SP, the backing plate 107 is mounted on the friction engagement device 100 when the backing plate 107 is assembled. If the assembling dimensions and the like vary, and if they occur on the inner peripheral side, the contact area of the backing plate 107 decreases and the durability decreases. Therefore, in any case, the function as the backing plate is reduced as a result. For this reason, when punching the backing plate, it is necessary to minimize the occurrence of dripping.

Here, in order to reduce who, it is conceivable to reduce the clearance of the mold. However, if the clearance of the mold is reduced, there is a problem that the life of the mold is shortened. So, conventionally,
As shown in FIG. 5c, the upper surface of the ring-shaped member was polished to eliminate any ones. Therefore, conventionally, polishing was required in addition to punching. Also, in recent years, the demands of the times have demanded reductions in the weight and fuel consumption of automobiles, and the automatic transmissions have also been required to be smaller and lighter. For this reason, the backing plate 107 is also arranged in a narrower space, and in order to prevent interference with other parts, as shown in FIGS. It is often formed in a so-called stepped shape having a thin portion T in which either one of the plate thicknesses is reduced (note that in FIG. 13, those indicated by the same numbers as those in FIG. This is a member that performs the same function as the member.) In such a stepped backing plate, the shape accuracy of the stepped portion is required because the stepped backing plate is arranged in a narrow space and needs to avoid interference with other components. In the past, the stepped portion (thin portion) was formed by cutting or the like, but in recent years, it has been formed by upsetting with a press machine in order to improve productivity and reduce costs. .

[0006]

As described above, in the conventional method, a polishing process is required after the punching process, and the life of the mold is shortened when drooping during the punching process is reduced. However, there were problems such as a decrease in performance and an increase in cost. SUMMARY OF THE INVENTION Accordingly, a first object of the present invention is to provide a method capable of suppressing the occurrence of drooling during punching of a plate material, and particularly to forming a backing plate used in a friction engagement device of an automatic transmission for a vehicle. A second object is to provide a processing method that is suitable and can improve the function of the backing plate.
Further, when the thin portion of the stepped backing plate is formed by upsetting, as shown in FIG. 11, the material of the stepped portion is thinned, and the required shape accuracy of the stepped portion (ideal stepped portion) is obtained. (Indicated by a broken line in FIG. 11) is difficult to secure. Therefore, a third object of the present invention is to provide a method of processing a stepped backing plate having good shape accuracy of a stepped portion by upsetting.

[0007]

According to the present invention, there is provided the following:
In order to achieve the object of (1), prior to the punching, upsetting is performed in advance in the vicinity of the portion to be punched, and a portion slightly shifted from the thinned portion up to the thick portion by the upsetting is punched. Accordingly, the material is work-hardened, and the stress at the time of the punching process is set so as not to reach the portion where the drooping is predicted to occur, and the dripping is suppressed. In addition, at least a part of the die of the die to be subjected to the upsetting, which is related to the upsetting, is provided with an inclination so as to become thinner toward the part to be punched, and the inclined side is punched at the time of punching. Side, so that the thickness of the upset processed product increases toward the part where
It is configured to cancel wholly in the punching process. Further, in order to achieve the second object, a spline-shaped contour is formed by upsetting, and a spline tooth is formed by punching out a portion slightly closer to a thick portion from the spline-shaped contour. A configuration is provided to suppress the occurrence of drooping at a portion, and variations in dimensions and the like when a backing plate is incorporated in a friction engagement device of an automatic transmission are reduced. In addition, an upsetting process is performed on the inner peripheral side of the ring-shaped member, and a portion that slightly shifts from the thinned portion up to the thick portion by the upsetting process is punched to suppress the occurrence of drooping on the inner peripheral side. The structure and the contact area are secured. And, in order to achieve the third object, prior to the punching, upsetting is performed simultaneously on the vicinity of the portion to be punched and the portion to be thinned, and the upsetting of the portion to be punched is performed. By punching out a portion slightly closer to the thicker portion from the thinner portion, the material is prevented from being thinned in the stepped portion, and the shape accuracy of the stepped portion is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, A is a ring-shaped member obtained by stamping a material. B in the figure is obtained by upsetting the outer peripheral portion of the above A. B
Has been reduced from the original thickness t1 to the thickness t3. The upsetting range is the final outer diameter D
A portion slightly larger than 1, that is, a portion outside D1 + ΔD. In other words, the part that is finally punched is
It is a place where it is slightly shifted from the part that has been installed and becomes thinner to the part that is thicker.

Subsequently, the swaged portion of the swaged product B in FIG. 1 is stamped at the position of the diameter D1 to become a final worked product.

FIG. 2 shows a mold used for the upsetting process of FIG. An upper mold plate 1 is provided so as to face the lower die 3, and various members are incorporated in the upper mold plate 1 as described below to form an upper mold.

An upsetting punch 2 is fixed to an upper die plate 1, and a counter punch 4 is incorporated so as to be able to move up and down. The counter punch 4 is urged by a pin 5. The upper die plate 1 is fixed to a slide of a press machine, the lower die is fixed to a bolster, and the upper die moves up and down as the slide moves up and down.

In a state where the ring-shaped material A is supplied onto the die 3, the upper mold descends as the upper mold descends. The counter punch 4 is urged by the pins 5 to hold the ring-shaped material A.

Subsequently, the upsetting punch 2 descends, and the outer peripheral portion of the ring-shaped material A is upset. When the slide is raised, the upper die is also raised, and the upsetting is completed.

FIG. 3 shows a die used for punching an upsetting product B which has been upset. The punch 8 is fixed to the lower mold plate 11, and these members constitute a lower mold.

An upper die is provided to face the lower die. A punching die 7 is fixed to the upper die plate 6, and a counter punch 9 is incorporated so as to be able to move up and down. The counter punch 9 is configured to be urged by a pin 10.
These members constitute an upper die.

The upper die is fixed to a slide of a press machine, and the lower die is fixed to a bolster. The upper die moves up and down with the vertical movement of the slide, and the upsetting product B is punched by the upper and lower dies in the following procedure.

The upsetting product B is supplied onto the punch 8 and the upper die is lowered with the slide down, and the counter punch 9 is urged by the pin 10 to hold the upsetting product B.

Subsequently, the punching die 7 is lowered, the upsetting product B is punched, the slide is raised, and the punching process is completed. In this punching process,
Due to the fact that the material at the punching position is work-hardened by the upsetting process in the previous process, and the aforementioned ΔD is small, shearing of the material occurs early, suppressing the occurrence of drooping and performing the punching process. Surface becomes smooth.

FIG. 4 shows a main part of FIG. 2, that is, a main part of a mold used for upsetting. The upper surface of the die 3
It is inclined so that it becomes lower toward the outside. The lower surfaces of the counter punch 4 and the upsetting punch 2 are horizontal, and the material flow also occurs inside, so that the thickness of the upsetting product B increases outward. Then, by performing the upsetting, the upset product B is plastically deformed, and the lower surface becomes flat, so that the change in the thickness cancels out drooping of the upset product.

The actual main dimensions in the above embodiment are shown below. D1 ≒ 150 mm, D2 ≒ 155, ΔD =
0.6-1.0 mm, t1 = 3.5 mm, t3 = 2.2
5 mm, α = 0.5 to 3 °.

The above-mentioned dimensions are merely examples, and the present invention is not limited to these dimensions. Although the above embodiment is directed to a ring member, the present invention can be applied to a simple disk. In the above embodiment, the outer peripheral portion is upset and punched, but the inner peripheral portion may be upset and punched. In that case, the upsetting punch 2 and the punching die 7 are provided on the inner peripheral portion. further,
Although the above embodiment is directed to a circular member, the present invention can be similarly applied to a backing plate having spline teeth formed on an outer peripheral portion or an inner peripheral portion, or a member having a more complicated shape.

FIG. 7 is a process explanatory view of a stepped backing plate having spline teeth formed on the outer peripheral portion. In FIG. 7, A 'is a ring-shaped material obtained by punching the material. The ring-shaped material A ′ is set up by simultaneously upsetting a portion slightly closer to the outer diameter side than the contour of the final product shape on the outer circumference side and a thinner portion on the inner circumference side. An embedded product B 'is obtained. At this time, a spline-shaped contour S is formed on the outer peripheral side of the upsetting product B ′ by the upsetting process. In addition, by simultaneously upsetting the inner and outer circumferences, the thinning at the stepped portion is suppressed, and the shape accuracy of the stepped portion becomes extremely good. next,
The final processed product in which the spline teeth SP are formed on the outer peripheral portion and the thin portion T is formed on the inner peripheral side by punching the inner peripheral side and the outer peripheral side of the upset processed product B ′, that is, a stepped backing A plate BK is obtained. At the time of the outer peripheral side punching processing, the outer peripheral side is punched at a position slightly closer to the inner diameter side than the spline-shaped contour S, so that a spline tooth SP without any droop can be obtained.

FIG. 8 shows a mold used for the upsetting of FIG. In FIG. 8, members common to those in FIG. 2 are denoted by the same reference numerals. An upper mold plate 1 is provided so as to face the die 3 as a lower mold, and various members are incorporated into the upper mold plate 1 as described below to constitute an upper mold.

Outer peripheral upsetting punch 2 ′ on upper die plate 1
The inner upset punch 12 is fixed concentrically, and the counter punch 4 is incorporated concentrically and vertically movable between the outer upset punch 2 ′ and the inner upset punch 12. Above the counter punch 4, a pin 5 incorporated in the upper die plate 1 is provided, and the counter punch 4 is structured to be urged downward by the pin 5. The upper die plate 1 is fixed to a slide (not shown) of a press machine, and the die 3 as a lower die is fixed to a bolster (not shown). The upper die moves up and down with the vertical movement of the slide, and the upper die and the lower die perform upsetting in the following procedure.

First, with the ring-shaped material A 'supplied onto the die 3, the upper die descends as the slide descends. At this time, the counter punch 4 is urged downward by the pin 5 to press the ring-shaped material A '.

When the slide further descends, the inner peripheral upsetting punch 12 and the outer peripheral upsetting punch 2 'descend following the counter punch 4, and the ring-shaped material A' is formed as a thin portion T on the inner peripheral portion. And the vicinity of the portion to be punched out of the outer peripheral portion is simultaneously upset, so that an upset product B ′ is obtained. At this time, by simultaneously upsetting the inner peripheral portion and the outer peripheral portion, the thinning of the material at the stepped portion is prevented, and the stepped portion is formed with high shape accuracy. After that, the upper die rises with the rise of the slide,
The upsetting process ends.

FIG. 9 shows a die used for punching the upset product B '. In FIG. 9, members common to those in FIG. 3 are denoted by the same reference numerals. Lower plate 1
A punch 8 is fixed to 1 and a lower mold is constituted by these members. On the other hand, an outer peripheral die 7 ′ and an inner peripheral die 13 are concentrically fixed to the upper die plate 6. Further, a counter punch is provided between the outer peripheral die 7 ′ and the inner peripheral die 13. 9 is incorporated concentrically and vertically. The counter punch 9
A pin 10 incorporated in the upper die plate 6 is disposed above the counter punch 9.
It is configured to be urged downward by 0.
An upper die is formed by these members, and the upper die is provided to face the lower die. The upper die plate 1 is fixed to a slide (not shown) of a press machine, and the lower die is fixed to a bolster (not shown). Then, the upper die moves up and down with the vertical movement of the slide, and the upset product B ′ is punched by the upper die and the lower die in the following procedure.

First, an upset product B ′ on the punch 8
Is supplied, and the upper die descends as the slide descends.
At this time, the counter punch 9 is urged downward by the pin 10 to hold the upset product B ′.
When the slide further descends, the inner peripheral punching die 13 and the outer peripheral punching die 7 'descend following the counter punch 9, and the upset product B' is punched at the inner peripheral portion and the outer peripheral portion. Thereafter, the upper die rises with the rise of the slide, and the punching process ends.

FIG. 10 shows a main part of the mold shown in FIG. As shown in the figure, the upper surface of the die 3 is inclined so as to become lower toward the outer peripheral side, and at least the lower surfaces of the outer peripheral punch 2 ′ and the counter punch 4 are horizontal. The operation and effect of such a mold structure are the same as those shown in FIG. 4, and a description thereof will be omitted to avoid redundancy.

In the above, the method of processing the stepped backing plate has been described by taking, as an example, a method in which a thin portion is provided on the inner peripheral side and spline teeth are formed on the outer peripheral side. The present invention can be applied to the processing of various stepped backing plates, such as those having spline teeth and those having spline teeth on the inner peripheral side.

[0031]

According to the first aspect of the present invention, prior to punching, upsetting is carried out in advance in the vicinity of the portion to be punched, and the portion which has been thinned by the upsetting is thickened. The material is work hardened by punching a part slightly closer to the surface, and the stress at the time of punching has been reduced to the part where it is predicted that droop will occur, suppressing the occurrence of drooping in punching You can do it. According to the configuration of claim 2, the die of the die for upsetting, at least a portion related to the upsetting of a portion remaining as a product, is provided with a slope that becomes thinner toward the portion to be punched, Further, by setting the inclined side to the punching side at the time of punching, the thickness of the upsetting product is increased toward the portion where the drooping occurs, so that drooping in the punching process can be canceled. According to the third aspect of the present invention, a spline-shaped contour is formed by upsetting, and a spline tooth is formed by punching out a portion slightly closer to a thick portion from the spline-shaped contour. In addition, when the frictional engagement device of the automatic transmission is used for the backing plate of the frictional engagement device of the automatic transmission, variations in dimensions and the like at the time of assembling the backing plate can be reduced. Reliability can be improved. Also,
According to the configuration of claim 4, the ring-shaped member is subjected to an upsetting process on the inner peripheral side, and a portion slightly shifted from a thinned portion to a thick portion by the upsetting is punched. In addition, the occurrence of drooping on the inner peripheral side is suppressed, and when used for a backing plate of a friction engagement device of an automatic transmission, a contact area of the backing plate can be secured, and the durability of the backing plate can be improved. it can. According to the configuration of claim 5, prior to the punching process, the upsetting process is performed simultaneously on the vicinity of the portion to be punched and the thin portion, and the upsetting process is performed on the portion to be punched. By punching out the part that is slightly closer to the thick part from the thinned part, the material in the stepped part is prevented from being thinned,
The shape accuracy of the stepped portion can be improved, and the function and quality of the stepped backing plate can be improved.

[Brief description of the drawings]

[FIG. 1] Process explanatory drawing

FIG. 2 is a vertical sectional view of a mold for upsetting.

FIG. 3 is a longitudinal sectional view of a stamping die.

FIG. 4 is an explanatory view of a main part of FIG. 2;

FIG. 5 is a conventional process diagram.

FIG. 6 is an explanatory diagram of who

FIG. 7 is an explanatory view of a step of a stepped backing plate.

FIG. 8 is a longitudinal sectional view of a mold for upsetting a stepped backing plate.

FIG. 9 is a longitudinal sectional view of a die for punching a stepped backing plate.

10 is an explanatory view of a main part of FIG. 8;

FIG. 11 is a partial cross-sectional view for explaining the closing of the stepped portion of the stepped backing plate.

FIG. 12 is a longitudinal sectional view showing an example of a friction engagement device.

FIG. 13 is a longitudinal sectional view showing another example of the friction engagement device.

[Explanation of symbols]

1 is an upper die plate, 2 is an upsetting punch, 2 'is an outer peripheral upsetting punch, 3 is a die, 4 is a counter punch, 5
Is a pin, 6 is an upper die plate, 7 is a punching die, 7 'is an outer punching die, 8 is a punch, 9 is a counter punch, 10 is a pin, 11 is a lower die plate, 12 is an inner peripheral upsetting punch, 13 is Inner circumference die, 100, 10
0 'is a friction engagement device, 101 and 101' are hydraulic pistons, 102 and 102 'are friction plate groups, 102a and 102
a 'is a first friction plate, 102b and 102b' are second friction plates, 103 and 103 'are hubs, 104 and 104' are drums, 105 and 105 'are hydraulic chambers, 106 is a return spring, 107 and 107. 'Is the backing plate, 1
08 and 108 'are snap rings, A and A' are ring-shaped materials, B and B 'are upset products, C is a final product, B
K is a stepped backing plate, S is a splined contour,
SP is a spline tooth, and T is a thin portion.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naoji Hosokawa 10 Takane, Fujii-machi, Anjo, Aichi Prefecture Inside Aisin AW Co., Ltd. AW Industrial Co., Ltd.

Claims (5)

[Claims] 1. Prior to punching, upsetting is performed in advance in the vicinity of a portion to be punched, and a portion slightly shifted from a thinned portion to a thick portion by the upsetting is punched out. A method for suppressing drooping in punching, characterized by obtaining a final processed product. 2. A die according to claim 1, wherein at least a portion of the die of the die for performing the upsetting, which is related to the upsetting of a portion remaining as a product, is provided with an inclination so as to become thinner toward a portion to be punched. And a method for suppressing drooping in a punching process, wherein the inclined side is used as a punching side at the time of punching. 3. The finished product is a backing plate used in a friction engagement device of an automatic transmission, wherein the upsetting process forms a spline-like profile, and the punching process forms spline teeth. The method for suppressing drooping in punching according to claim 1 or 2, characterized in that: 4. The finished product is a backing plate used in a friction engagement device of an automatic transmission, wherein the ring-shaped member has spline teeth formed on an outer peripheral side and the punching process is performed on an inner peripheral side. 4. The method according to claim 1, wherein the sagging is suppressed in the punching process. 5. 5. Prior to the punching process, an upsetting process is performed simultaneously on the vicinity of the portion to be punched and on a portion to be a thin portion, and from the upsetting and thinned portion of the punching portion. A dripping control method in punching, characterized by punching a part slightly approaching a thick part.