JP2924573B2 - Tooth forming mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die used for press-forming a tooth profile of a clutch component constituting an automatic transmission, for example.

[0002]

2. Description of the Related Art Conventionally, in order to press-mold a clutch component 20 having a tooth-shaped projection 21 on a side face as shown in FIG. 4, a tooth-forming mold as shown in FIG. 5 has been used.

More specifically, a mold 100 shown in FIGS. 5A and 5B is fixed to a lower mold and has a gear-shaped punch 101 having a plurality of tooth-shaped projections 101a on a side surface. A pad 102 for holding a cylindrical panel P shown by an imaginary line on the punch 101;
No. 01 is formed in an internal gear shape having irregularities corresponding to the tooth-shaped projections 101a on the inner peripheral surface, and on the outer peripheral side of the punch 101 with a clearance substantially equal to the thickness of the panel P between the punch 101 and the punch 101. Dies 103 to be loosely fitted
And a ring 104 into which the die 103 is press-fitted on the inner peripheral side.
And a retainer 105 for holding the die 103 and the ring 104 on the upper die, and a die 103 and the ring 10
And a ring plate 106 for fixing the retainer 105 to the retainer 105. A cooling water groove 103a is formed in a spiral shape on the outer peripheral side of the die 103.
5 and the cooling water introduced from the cooling water introduction path 107 formed by penetrating the ring 104
After circulating around the periphery of the die 103, the die 103 is cooled by being discharged out of the mold 100 through a drainage passage 108 provided in the ring 104 and the retainer 105. In FIG. 5B, in order to simplify the drawing, the number of the tooth-shaped protrusions 101a of the punch 101 and the number of the internal gear-shaped irregularities of the die 103 are made smaller than actual, and the shape is shown larger than actual. ing.

In order to form the member 20 having the tooth-shaped projections 21 by using the mold 100 having such a structure, first, a panel P formed in advance into a cylindrical shape is placed on the gear-shaped punch 101. Place the panel P on the pad 1
After being pressed against the punch 101 by 02, the internal gear-shaped die 103 is lowered together with the upper die, whereby the tooth-shaped projection 21 is formed on the side surface of the panel P.

After the protrusion 21 is formed, the upper die is raised, and the panel P is discharged from the die 103 by the pad 102 by the pad 102, so that the panel P remains on the punch 101 and the side surface has a tooth shape. Panel P having projections 21 of
Can be obtained.

[0006]

However, in the conventional tooth forming mold 100 described above, the die 1
Since the die 103 is only cooled from the outer peripheral side by the cooling water groove 103a provided on the outer periphery of
The cooling efficiency is not sufficient, and the die 103 and the punch 101
In addition to the temperature rise, not only a dimensional error occurs between the molded product at the beginning of the molding process and the molded product after the molding is repeated, but also the life of the die 103 and the punch 101 is shortened. There has been a problem in a tooth forming mold for press-molding a member having the above-mentioned shape to solve such a problem.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in a conventional tooth forming die, and has excellent cooling efficiency of a die or a punch for forming a tooth-shaped projection and improvement of dimensional accuracy of a molded product. It is another object of the present invention to provide a tooth forming die capable of greatly improving the service life of a die or a punch constituting the die.

[0008]

According to the present invention, there is provided a tooth forming die having a predetermined clearance between a gear-shaped punch having a plurality of tooth-shaped protrusions on a side surface and a tooth-shaped protrusion of the punch on an outer peripheral side of the punch. And a plurality of die rings which are loosely fitted with each other and which are inserted at positions on the inner peripheral side of the die ring and opposed between the tooth-shaped projections of the punch and form a predetermined clearance between the punch and the punch. An internal gear-shaped die consisting of a toothed tip, a die ring and a toothed tip
Equipped with a retainer and a holding plate
The die, retainer, holding plate and teeth
A water passage for cooling the tooth- shaped tip and the die ring is provided between the tooth- shaped tip and the tooth- shaped tip. Means.

[0009]

In the tooth forming die according to the present invention, the teeth forming the projections of the internal gear-shaped die are formed as separate tooth tips, and a plurality of the tooth tips are inserted into the inner peripheral side of the die ring. As a result, a die for providing tooth-shaped projections on the molded product during press molding is formed, and the periphery of the tooth-shaped chip, that is, a die ring and a tooth chip are formed.
Retainer and holding press
A water passage for passing cooling water for cooling the tooth-shaped tip and the die ring is provided between the seat and the tooth-shaped tip . Therefore, the cooling efficiency is improved because the cooling water directly cools the tooth-shaped chip, and the temperature rise of the tooth-shaped chip, the die ring and the punch is suppressed at the time of press molding, and the dimensional accuracy of the molded product is improved. The service life of the dies and punches constituting the mold is extended.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of a tooth-forming mold according to the present invention. The tooth-forming mold 1 shown in FIGS. 1A and 1B is fixed to a lower mold. , A gear-shaped punch 2 having a plurality of tooth-shaped projections 2a on a side surface, and a cylindrical panel P shown by an imaginary line in FIG.
A die ring 4 which is loosely fitted between the pad 3 for holding the punch P on the punch 2 and a tooth-shaped projection 2a of the punch 2 with a clearance substantially equal to the thickness of the panel P;
The inner circumferential surface of the die ring 4 is inserted into fitting grooves 4a formed at positions facing valley portions formed between adjacent tooth-shaped projections 2a of the punch 2, and A plurality of tooth-shaped chips 5 are formed to form a clearance substantially equal to the thickness of the panel P between the punch 2 and the valley portion. A die 6 is formed by the die ring 4 and the tooth-shaped chips 5.

Further, the tooth forming mold 1 is provided with a die ring 4.
A retainer 7 for holding a die 6 having a tooth-shaped tip 5 inserted thereinto, and a ring plate for fixing the die 6 comprising the die ring 4 and the tooth-shaped tip 5 to the retainer 7
(Holding plate) 8.

A vertical channel 4b is formed in the corner of the fitting groove 4a of the die ring 4 so as to penetrate in the vertical direction, and the vertical channel 4b is provided on the lower surface of the retainer 7. The water passage 7a and the water passage 8a provided on the upper surface of the ring plate 8 are connected to form a water passage for passing cooling water for cooling the die ring 4 and the tooth-shaped chip 4.

The water passage composed of the vertical water passage 4 and the water passage grooves 7a and 8a is provided with a retainer 7 and a die ring 4 as shown in FIG. Is connected to the outside of the tooth forming die 1 through a cooling water introduction passage 9 provided in the cooling water introduction passage 9 and a drainage furnace 10 provided on the opposite side of the cooling water introduction passage 9. As shown in FIG. 3, the water flows through the water passage groove 7 on the retainer 7 side.
a through the vertical channel 4b of the die ring 4 and the water channel 8a of the ring plate 8;
b, around the tooth-shaped tip 5 through the water passage groove 7a,
While being cooled, the tooth-shaped tip 5 and the die ring 4 are discharged to the outside of the tooth forming die 1 through the drainage channel 11.

In FIG. 1B, in order to make the drawing simpler, similarly to FIG. 5B, the number of the tooth-shaped protrusions 2a of the punch 2 and the number of the tooth-shaped chips 5 of the die 6 are larger than the actual number. These shapes are shown smaller and these shapes are shown larger than they actually are.

In the tooth forming die 1 having such a structure, first, a panel P preformed in a cylindrical shape is placed on the punch 1 and pressed by the pad 3, and then the die ring 4 and the tooth tip 5 are formed. By lowering the die 6 formed with the upper die together with the upper die, a tooth-shaped projection is formed on the side surface of the panel P. Next, when the upper mold is raised, the panel P is discharged from the die 6 by the pad 3, and the clutch component 20 having the tooth-shaped protrusion 21 on the side surface as shown in FIG. 4 is obtained.

At this time, cooling water is supplied from the cooling water introduction passage 9 to the die ring 4, the vertical water passage 4 formed in the retainer 7 and the ring plate 8, and the water passage formed by the water passage grooves 7a and 8a. Although the ring 4 and the tooth-shaped tip 5 are cooled, since the tooth-shaped tip 5 can be directly cooled, the frictional heat generated at the time of forming the panel P is instantaneously absorbed. The temperature rise of the die 6 and the punch 2 composed of the die ring 4 and the tooth-shaped tip 5 can be suppressed, a molded product with high dimensional accuracy can be obtained, and the life of the die 6 and the punch 2 can be greatly improved. The consumption of the lubricating oil used can be halved.

Further, since the die 6 is formed by inserting the tooth-shaped chip 5 into the die ring 4, even if a part of the die 6 is damaged, it is not necessary to replace the entire die.
Since it is only necessary to replace a damaged tooth tip, a large cost reduction can be achieved as compared with an integrated die.

[0019]

As described above, the tooth forming die according to the present invention has the above-mentioned structure, that is, a die in which a tooth-shaped chip formed separately from the die ring is inserted into the inner peripheral surface of the die ring. Use and around the tooth tip,
Die, retainer and retainer
A water passage for cooling the tooth-shaped chip and die ring is provided between the plate and the plate, so that the cooling efficiency of the die is dramatically improved, the dimensional accuracy of the molded product is improved, the life of the die is extended, and lubrication is performed. It is extremely effective in reducing oil consumption and dice cost.

[Brief description of the drawings]

FIG. 1 (a) is a longitudinal sectional view showing one embodiment of a tooth forming type mold according to the present invention. (B) It is a horizontal sectional view in the AA line position of the tooth formation type mold shown in Drawing 1 (a).

FIG. 2 is a longitudinal sectional view of the tooth formation type mold shown in FIG. 1 (b) taken along the line II-II.

FIG. 3 is a view showing the flow of the cooling water in the tooth forming die shown in FIG. 1 as viewed from the direction of the die center of the die ring and the tooth-shaped tip.

FIG. 4 is a perspective view showing a shape of a member press-formed by the tooth forming die shown in FIG. 1;

FIG. 5 (a) is a longitudinal sectional view showing a conventional tooth forming mold. (B) It is a horizontal sectional view in the BB line position of the tooth formation type mold shown in Drawing 5 (a).

[Explanation of symbols]

Reference Signs List 1 tooth forming mold 2 punch 2a tooth-shaped protrusion 4 die ring 4b vertical water passage (water passage) 5 tooth-shaped chip 6 die 7 retainer 7a water passage groove (water passage) 8 ring plate (holding plate) 8a water passage groove (water passage)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21D 53/28 B21D 22/30

Claims (1)

(57) [Claims] 1. A gear-shaped punch having a plurality of tooth-shaped protrusions on a side surface, a die ring loosely fitted on an outer peripheral side of the punch with a predetermined clearance between the tooth-shaped protrusions of the punch, and the die ring. an inner gear-shaped die comprising a plurality of teeth chips forming a predetermined clearance between a inner peripheral side of the punch while being inserted at a position facing between tooth projections of the punch, die ring That clamps a die consisting of
A die, a retainer, a holding plate and a toothed ring.
A water passage for cooling the tooth-shaped tip and the die ring is provided between the tooth-forming die and the die.