JPH05212481A - Forming device for cup like product with spline having snap ring groove - Google Patents

Abstract

PURPOSE:To release the product without forming the crest part of spline of the opening end side of the product to be narrow in width. CONSTITUTION:A die 3 formed with tooth grooves 3a corresponding to the spline shape on the circumferential surface and a spline forming punch 4 which advances inward in the radial direction toward the tooth grooves 3a linking with lowering of an upper die 2 are provided on a lower die 1. A punch 6 which projects in the tooth groove 3a and forms a snap ring groove Wb is provided freely movably back and forth in the radial direction on the die 3. At the time of elevating the upper die 2, the punch 6 is moved inward in the radial direction through a linking mechanism 7, the punch 6 is sunk into the groove bottom of the tooth groove 3a so that the spline crest part Wa of the opening end side positioned at the lower side of the snap ring groove is prevented from being caught with the punch 6 at the time of releasing the product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding device for a cup-shaped product with a spline having a snap ring groove for snap ring fitting, which is used for a clutch drum of a hydraulic clutch of an automatic transmission for a vehicle.

[0002]

2. Description of the Related Art Heretofore, this type of cup-shaped product has a snap ring groove in which a spline is formed on the peripheral wall of a sheet-metal cup-shaped material, and a portion of the crest of the spline protruding inward of the peripheral wall is recessed outward. It is manufactured by molding and. The snap ring groove is generally formed in a separate step after the spline is formed, but an apparatus for forming the spline and the snap ring groove at the same time is also known from Japanese Patent Laid-Open No. 62-14040. This molding apparatus includes a lower mold and an upper mold, and in the lower mold, a cup-shaped material can be set with the material facing downward, and a die having tooth grooves corresponding to a spline shape formed on the peripheral surface,
A spline forming punch that is moved forward and backward in the radial direction toward the tooth groove in association with the up-and-down movement of the upper die is provided, and a snap ring groove forming punch protruding into the tooth groove and a spline forming punch are provided on the die. It is provided with a relief part for the snap ring groove forming punch, and the spline forming punch is advanced inward in the radial direction by lowering the upper die, and the peripheral wall of the cup-shaped material is pushed into the tooth groove to form the crest portion of the spline. At the same time, the snap ring groove forming punch prevents the peripheral wall portion that coincides with the relief portion of the punch from being pushed into the tooth groove, and the groove forming punch bites into the mountain portion along with the formation of the spline mountain portion to snap the snap ring. The groove is formed. However, if the groove forming punch bites into the crest of the spline, the product cannot be removed from the die.Therefore, in this product, the groove width of the lower part of the groove forming punch of the tooth groove is narrowed to become the open end of the product. The gap between the crests of the spline on the lower end side is wide, and the groove forming punch is rotated about the die axis by half the pitch of the spline in conjunction with the rise of the upper die. The product is removed from the die by placing it within the wide space between the crests of the spline on the lower end side.

[0003]

In the above, the width of the crest portion on the opening end side of the product is narrowed, the pressure receiving area of the pressing force acting on the snap ring to the opening end side is reduced, and the snap ring is reduced. However, there is a problem that the supporting strength of is reduced. In view of the above points, the present invention provides a molding apparatus for simultaneously molding a spline and a snap ring groove, which allows a product to be extracted from a die without forming a narrow mountain portion on the opening end side of the product. The purpose is to do.

[0004]

[Means for Solving the Problems] In order to achieve the above object,
The present invention is a device for simultaneously forming a spline and a snap ring groove on a peripheral wall of a sheet-shaped cup-shaped material, which includes a lower die and an upper die, and the cup-shaped material can be set downward in the lower die. And a die having a tooth groove corresponding to a spline shape formed on the peripheral surface thereof, and a spline forming punch that is moved forward and backward in the radial direction toward the tooth groove in association with the up-and-down movement of the upper die, and the die is In the one in which a snap ring groove forming punch protruding into the tooth groove and a relief portion for the snap ring groove forming punch are provided in the spline forming punch, the snap ring groove forming punch is formed in the die so that the snap ring groove forming punch is projected and retracted in the tooth groove. It is characterized in that it is provided with an interlocking mechanism for supporting the snap ring groove forming punch in the radial direction in conjunction with the vertical movement of the upper die so as to be supported in the radial direction.

[0005]

When the upper die is machined, the spline molding punch advances radially inward toward the tooth groove, and the crest portion of the spline and the snap ring protruding into the tooth groove by the cooperation of the punch and the tooth groove. The snap ring groove is formed at the same time by the cooperation of the groove forming punch and the relief portion of the spline forming punch.
Although this point is not particularly different from the above-mentioned conventional apparatus, according to the present invention, the snap ring groove forming punch is moved radially inward via the interlocking mechanism when the upper die is lifted, and the snap ring groove forming punch is recessed into the groove bottom of the tooth groove. Thus, the product can be removed from the die without narrowing the peak of the spline on the open end side of the product.

[0006]

EXAMPLE In the illustrated example, as shown in FIG. 3, a crest portion Wa of a spline protruding inward on a peripheral wall and a part of the crest portion Wa for fitting a snap ring a are recessed outward. It is an apparatus for forming a cup-shaped product W composed of a clutch drum having a snap ring groove Wb formed in advance.

As shown in FIG. 1, the molding apparatus comprises a lower mold 1 and an upper mold 2 which can be moved up and down, and a die 3 which can be set on the lower mold 1 with a cup-shaped material made of sheet metal facing downward. And a plurality of spline forming punches 4 which are located around the die 3 and can move back and forth in the radial direction as shown in FIG. The die 3 is formed in a cylindrical shape, and a plurality of tooth grooves 3a corresponding to the spline shape are formed on the outer peripheral surface of the die 3, and the punches are inserted through the driver cams 5 vertically installed on the die 3 when the upper die 2 descends. 4 is advanced radially inward toward each tooth groove 3a,
The peripheral wall of the material is made into a tooth groove 3 by the tooth crests 4a at the tip of each punch 4.
The peak portion Wa of the spline is formed by pressing the spline into a.

The die 3 is provided with a plurality of snap ring groove forming punches 6 projecting into the tooth grooves 3a corresponding to the tooth grooves 3a. The snap ring groove forming punch of the tooth crests 4a of the spline forming punch 4 is provided. 6 is formed with an escape portion 4b which is recessed outward, and when the spline forming punch 4 is advanced inward in the radial direction to form the crest portion Wa of the spline, the snap ring groove forming punch 6 and the escape portion are formed. The snap ring groove Wb is formed in cooperation with 4b.

The snap ring groove forming punch 6 is slidably inserted and supported in a radial guide hole 3b formed in the die 3, and the punch 6 is radiated through the interlocking mechanism 7 by the up-and-down movement of the upper die 2. I tried to move back and forth in the direction. The interlocking mechanism 7 has a bell crank-shaped lever 8 having one end engaged with a vertically elongated hole 6a formed in the snap ring groove forming punch 6 and the other end provided with a roller 8a facing the inner circumference of the die 3. , A cam pin 9 slidably inserted in the inner circumference of the die 3 and biased upward by a spring 9a. And
A pad 10 for sandwiching the bottom wall of the cup-shaped material with the die 3 is attached to the upper die 2 by urging it downward with a spring 10a, and the cam pin 9 is pushed down through the pad 10 when the upper die 2 descends. In this way, the portion of the cam pin 9 facing the roller 8a at the depressed position is formed as the small diameter portion 9b, and the portion of the cam pin 9 facing the radially inner end of the snap ring groove forming punch 6 is formed as the large diameter portion 9c.

Then, if the upper mold 2 is lowered, as shown in FIG.
As shown in (a), the snap ring groove forming punch 6 is pushed radially outward by the large diameter portion 9c and projects into the tooth groove 3a. In this state, the spline forming punch 4 advances radially inward and As described above, the peak portion Wa of the spline and the snap ring groove Wb are formed. After molding, if the upper die 2 is raised, the cam pin 9 is moved upward by the urging force of the spring 9a,
The large-diameter portion 9c is released above the inner end portion of the snap ring groove forming punch 6 to release the outward pressing of the punch 6, and then the large-diameter portion 9c contacts the roller 8a so that the lever 8 moves. With the pivot 8b as a fulcrum, it is rotated clockwise in the drawing.
As shown in (b), the snap ring groove forming punch 6 is moved inward in the radial direction and is recessed in the groove bottom of the tooth groove 3a. Thus, the punch 6 does not catch on the spline mountain portion Wa below the snap ring groove Wb, and the spline mountain portion w is formed.
The product W can be extracted from the die 3 even if a is formed in the same sectional shape over the entire length.

[0011]

As is apparent from the above description, according to the present invention, the product can be removed from the die without forming the crest portion of the spline on the opening end side of the product to be narrow. This has the effect of ensuring a large pressure receiving area for the pressing force acting on the snap ring toward the opening end side, and improving the support strength of the snap ring.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of an embodiment of the device of the present invention, (a)
Is a cross-sectional view during molding, and (b) is a cross-sectional view during mold opening.

FIG. 2 is an enlarged cutaway plan view taken along line II-II of FIG.

[Figure 3] Product perspective view

[Explanation of symbols]

 1 Lower mold 2 Upper mold 3 Die 3a Tooth groove 4 Spline forming punch 4b Relief part 6 Snap ring groove forming punch 7 Interlocking mechanism

Claims (1)

[Claims] 1. An apparatus for simultaneously forming a spline and a snap ring groove on a peripheral wall of a sheet metal cup-shaped material, comprising a lower mold and an upper mold, and setting the cup-shaped material downward in the lower mold. A die that is free and has a tooth groove corresponding to a spline shape on its peripheral surface, and a spline forming punch that is moved forward and backward in the radial direction toward the tooth groove in conjunction with the up-and-down movement of the upper die are provided. A snap ring groove forming punch projecting into the tooth groove and a relief portion for the snap ring groove forming punch are provided in the spline forming punch, and a die for inserting the snap ring groove forming punch into and out of the tooth groove. A snap mechanism characterized in that the snap ring groove forming punch is supported in a radial direction so that it can be moved back and forth in a radial direction and the snap ring groove forming punch is moved back and forth in a radial direction in conjunction with the vertical movement of the upper die. Molding device for cup-shaped products with splines having pulling grooves.