JPH071063A - Die for forming teeth - Google Patents

Abstract

PURPOSE:To provide a die for teeth shape forming by which a cup shaped member having teeth shaped projection on its side surface is press formed, whose dies and punches for teeth forming are excellently cooled, the dimensional preciseness of formed goods is improved and whose life time is largely extended. CONSTITUTION:The internal gear shaped die 6 consists of a die ring 4 and plural teeth shaped tips 5 which are formed separated from the die ring 4 and inserted and engaged with the die ring 4 on its inside circumferential side. Water passages 4b, 7a and 8a are provided around the teeth shaped tips 5 to cool the die ring and teeth shaped tips.

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-molding a tooth profile of a clutch part constituting an automatic transmission.

[0002]

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

That is, the mold 100 shown in FIGS. 5 (a) and 5 (b) is fixed to a lower mold and has a gear-like punch 101 having a plurality of tooth-shaped projections 101a on its side surface. A pad 102 for pressing a cylindrical panel P indicated by an imaginary line into the punch 101, and the punch 1
No. 01 tooth-shaped projection 101a is formed on the inner peripheral surface of the inner gear, and the outer peripheral side of the punch 101 is spaced apart from the punch 101 by a clearance substantially equal to the thickness of the panel P. Die 103 loosely fitted
And a ring 104 in which the die 103 is press-fitted on the inner peripheral side.
A retainer 105 for holding the die 103 and the ring 104 in the upper mold, and the die 103 and the ring 10.
4 is fixed to the retainer 105, and the cooling water groove 103a is spirally formed on the outer peripheral side of the die 103.
5 and the cooling water introduced from the cooling water introduction passage 107 formed by penetrating the ring 104,
After being circulated around 03, the die 103 is cooled by being discharged to the outside of the mold 100 through the drainage channel 108 provided in the ring 104 and the retainer 105. In addition, in FIG. 5B, in order to simplify the drawing, the number of tooth-shaped projections 101a of the punch 101 and 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 mold the member 20 having the tooth-shaped protrusions 21 by using the mold 100 having such a structure, first, the panel P which has been formed in a cylindrical shape in advance 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 tooth 103 is formed on the side surface of the panel P by lowering the internal gear-shaped die 103 together with the upper die.

After the projection 21 is formed, the upper die is raised and the panel P is ejected from the die 103 by the pad 102 by the pad 102, so that the panel P remains on the punch 101 and has a tooth shape on the side surface. Panel P having the protrusion 21 of the member 20, that is, the member 20
Can be obtained.

[0006]

However, in the above-mentioned conventional tooth forming mold 100, the die 1 is used.
03, the die 103 is only cooled from the outer peripheral side by the cooling water groove 103a provided on the outer periphery,
The cooling efficiency is not sufficient, and during repeated molding, friction heat generated during molding causes die 103 or punch 101
Since the temperature of the die increases, not only a dimensional error occurs between the molded product at the beginning of the molding process and the molded product after repeated molding, but also the life of the die 103 and the punch 101 is shortened. However, the solution of such a problem has been a problem in the tooth forming mold for press-molding the member having the above-mentioned shape.

[0007]

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

[0008]

A tooth forming die according to the present invention has a predetermined clearance between a gear-shaped punch having a plurality of tooth-shaped projections on its side surface and a tooth-shaped projection of the punch on the outer peripheral side of the punch. And a plurality of die rings that are loosely fitted to each other and that are inserted at positions on the inner peripheral side of the die ring that face the tooth-shaped projections of the punch and that form a predetermined clearance with the punch. An internal gear-shaped die made of a tooth-shaped tip is provided, and it is characterized in that a water passage for cooling the tooth-shaped tip and the die ring is provided around the tooth-shaped tip. The configuration is a means for solving the above-mentioned conventional problems.

[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 profile tips, and a plurality of the tooth profile tips are inserted into the inner peripheral side of the die ring. By forming a die for imparting tooth-shaped projections to the molded product during press molding, a water passage for passing cooling water for cooling the tooth profile chip and the die ring around the tooth profile chip. Is provided. Therefore, since the cooling water directly cools the tooth profile tip, the cooling efficiency is improved, the temperature rise of the tooth profile tip, die ring and punch is suppressed during press molding, and the dimensional accuracy of the molded product is improved, and The service life of the dies and punches that make up the mold is extended.

[0010]

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

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 its side surface, and a cylindrical panel P shown by phantom lines in FIG.
A pad 3 for pressing the punch 2 onto the punch 2 and a die ring 4 loosely fitted between the tooth-shaped projection 2a of the punch 2 with a clearance approximately equal to the thickness of the panel P;
The die ring 4 is inserted into and fitted into fitting grooves 4a formed at inner peripheral surfaces of the punch 2 at positions facing the valley-shaped portions formed between the adjacent tooth-shaped projections 2a, 2a of the punch 2. A plurality of tooth-shaped chips 5 forming a clearance approximately equal to the wall thickness of the panel P is provided between the punch 2 and the valley-shaped portions, and the die ring 4 and the tooth-shaped chips 5 form a die 6.

Further, the tooth forming die 1 has a die ring 4
The retainer 7 holds the die 6 having the tooth-shaped tip 5 inserted thereinto in the upper die, and the ring plate 8 that fixes the die 6 including the die ring 4 and the tooth-shaped tip 5 to the retainer 7.

A vertical water passage 4b is formed in the corner of the fitting groove 4a of the die ring 4 so as to pass therethrough in the vertical direction. The vertical water passage 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 toothed tip 4.

As shown in FIG. 2, which is a longitudinal sectional view taken along line II-II of FIG. 1B, the retainer 7 and the die ring 4 form the vertical water passage 4 and the water passages 7a and 8a. Is communicated with the outside of the tooth forming mold 1 through a cooling water introducing passage 9 provided in the cooling water introducing passage 9 and a draining furnace 10 provided on the opposite side of the cooling water introducing passage 9, As shown in FIG. 3, the water flows through the water passage 7 on the retainer 7 side.
a, divided into right and left, passing through the vertical water channel 4b of the die ring 4 and the water flow groove 8a of the ring plate 8,
b, passing around the toothed tip 5 through the water passage 7a,
While cooling the toothed tip 5 and the die ring 4, the toothed tip 5 and the die ring 4 are discharged to the outside of the tooth forming die 1 through a drainage channel 11.

Incidentally, in FIG. 1B, 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 set to be more than the actual number in order to simplify the drawing, as in FIG. 5B. These shapes are shown to be larger than they actually are, with few illustrations.

In the tooth forming die 1 having such a structure, first, the panel P which is preformed into 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 pressed. A tooth-shaped projection is formed on the side surface of the panel P by lowering the die 6 made of the same as the upper die. 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 as shown in FIG. 4 having the tooth-shaped protrusions 21 on the side surface is obtained.

At this time, the cooling water is supplied from the cooling water introducing passage 9 to the water passage formed by the die ring 4, the retainer 7 and the ring plate 8 and the water passages 7a, 8a. Although the ring 4 and the tooth profile tip 5 are cooled, since the tooth profile tip 5 can be directly cooled, the frictional heat generated during the molding of the panel P is instantly absorbed, and therefore even if the continuous molding is performed. The temperature rise of the die 6 and the punch 2 composed of the die ring 4 and the toothed 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 is dramatically improved, and at the time of molding. The consumption of the lubricating oil used can also be halved.

Further, since the tooth 6 is inserted into the die ring 4 in the die 6, it is not necessary to replace the entire die even if a part thereof is damaged.
Since it is only necessary to replace the broken tooth-shaped tip, it is possible to significantly reduce the cost as compared with the integrated die.

[0019]

As described above, the tooth forming die according to the present invention has the above-described 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. In addition to being used, a water passage for cooling the tooth profile tip and the die ring is provided around the tooth profile tip, so that the cooling efficiency of the die is dramatically improved, the dimensional accuracy of the molded product is improved, and the die life is improved. Extended, reducing the amount of lubricating oil used, further reducing die cost, etc.
It is extremely effective.

[Brief description of drawings]

FIG. 1A is a longitudinal sectional view showing an embodiment of a tooth forming mold according to the present invention. (B) It is a horizontal cross-sectional view in the AA line position of the tooth forming mold shown in FIG.

FIG. 2 is a vertical cross-sectional view taken along line II-II of the tooth forming mold shown in FIG. 1 (b).

3 is a view showing the flow of 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 profile tip.

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

FIG. 5A is a vertical sectional view showing a conventional tooth forming die. (B) FIG. 6 is a horizontal cross-sectional view of the tooth forming die shown in FIG.

[Explanation of symbols]

 1 Tooth forming type 2 Punch 2a Tooth shape protrusion 4 Die ring 4b Vertical water channel (water channel) 5 Tooth profile tip 6 Die 7a Water channel (water channel) 8a Water channel (water channel)

Claims (1)

[Claims] 1. A gear ring punch having a plurality of tooth-shaped protrusions on its side surface, and a die ring loosely fitted to the outer peripheral side of the punch with a predetermined clearance between the tooth-shaped protrusion of the punch and the die ring. An inner gear-shaped die made of a plurality of tooth-shaped chips that are inserted into positions facing the tooth-shaped projections of the punch and that form a predetermined clearance with the punch, A tooth forming die characterized in that a water passage for cooling the tooth tip and the die ring is provided around the tooth tip.