JP3039199B2 - 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;
01 is formed in the shape of an internal gear provided with a tooth profile corresponding to the tooth profile projection 101a on the inner peripheral surface thereof, 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
4 is fixed to a retainer 105, and a cooling water groove 103 a is spirally formed on the outer peripheral side of the die 103.
And cooling water introduced from a cooling water introduction passage 107 formed by penetrating the ring 104
3 and the ring 104 and the retainer 1
The die 103 is cooled by being discharged to the outside of the mold 100 through the drainage passage 108 provided in the mold 05, and releases heat generated during molding.

In FIG. 5B, in order to simplify the drawing, a tooth-shaped projection 101a of a punch 101 is used.
The number of the internal gear-shaped irregularities of the die and the die 103 is made smaller than the actual number, and the shape is shown larger than the actual number.

In order to form the clutch component 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. After the panel P is pressed against the punch 101 by the pad 102,
The tooth-shaped projection 21 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 has been formed, the upper die is raised, and the panel P is ejected from the die 103 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 the projections 21 of the above, that is, the clutch component 20 can be obtained.

[0007]

However, in the conventional tooth forming mold 100 described above, the die 1
The die 103 is only cooled from the outer peripheral side by the cooling water groove 103a spirally provided on the outer periphery of the outer periphery 03, and the part where heat is generated cannot be directly cooled, so that the cooling efficiency is not sufficient, As the molding is repeated, the die 103 and the punch 1
Since the temperature of No. 01 rises, not only does a dimensional error occur between the molded article at the beginning of the molding process and the molded article after repeated molding, but also the life of the die 103 and the punch 101 is shortened. There is a point, and solving such a problem has been a problem in a tooth forming mold for press-molding a member having the above shape.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the conventional tooth forming mold, and has been made in consideration of the cooling efficiency of a die or a punch for forming a tooth-shaped projection and the gap between the die and a molded panel. It is an object of the present invention to provide a tooth forming die that has excellent lubricity, can improve the dimensional accuracy of a molded product, and can significantly improve the service life of a die or a punch that constitutes a die.

[0009]

SUMMARY OF THE INVENTION A tooth forming mold according to the present invention has a gear-shaped punch having a plurality of tooth-shaped protrusions on a side surface, and has a tooth shape corresponding to the tooth-shaped protrusions of the punch. An internal gear-shaped die that loosely fits and forms a predetermined clearance between the punch and the punch is provided, a lubricating liquid outlet that jets a lubricating liquid to an inner peripheral surface of the die, and a passage of the lubricating liquid during molding. Grooves and lubricating fluid through the grooves
It is characterized in that a discharge port for lubricating liquid communicating with the jet port is provided, and such a tooth-forming configuration is a means for solving the above-mentioned conventional problems.
Further, as an embodiment of the tooth forming type mold according to the present invention,
It is also desirable, if necessary, to provide an air supply passage communicating with the lubricating liquid ejection port of the die in the dice so that the lubricating liquid is ejected together with air.

[0010]

The tooth forming die according to the present invention is provided with a lubricating liquid jet port for jetting lubricating liquid on the inner peripheral surface of the internal gear-shaped die, and a groove serving as a passage for the lubricating liquid. Before the start of molding, the lubricating liquid ejected from the jet port flows on the inner peripheral surface of the die and cools the die.At the start of molding, the lubricating liquid is poured into the panel to be molded, and the lubricating liquid is sufficiently applied to the panel surface. Will be applied. Further, during the molding, the lubricating liquid passes through the grooves formed on the inner peripheral surface of the die to cool the panel and the die, and also reduces the friction between the two to reduce the generation of frictional heat. That is, in the tooth forming mold according to the present invention, the lubricating liquid directly cools the die and the panel to be molded, and the generation of frictional heat between the two is minimized, so that the cooling efficiency is improved and the press molding is performed. In this case, the temperature rise of the die and the punch is reduced, the dimensional accuracy of the molded product is improved, and the service life of the die and the punch constituting the mold is extended. Also, it communicates with the lubricating liquid jet through the groove.
Is configured to have a discharge port for lubricating fluid
During molding, the lubricating fluid sprayed on the panel and die
The lubricating fluid will be collected from the discharge port, and
Used. In addition, the lubricating liquid
Is the configuration provided with a communicating air supply path?
The lubricating fluid is cooled by air, further cooling efficiency
Is improved.

[0011]

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

FIGS. 1 to 3 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.
And a pad 3 for holding the panel P on the punch 2 and an internal gear shape provided on the inner peripheral surface with a tooth profile corresponding to the tooth-shaped projection 2a of the punch 2. The thickness of the panel P is set between the pad 3 and the punch 2. A die 4 is loosely fitted on the outer peripheral side of the punch 2 with a clearance substantially equal to that of the punch 2, a retainer 5 for holding the die 4 on an upper die, and a ring plate 6 for fixing the die 4 to the retainer 5. ing.

A lubricating liquid outlet 7 is formed at substantially the center of the tooth-shaped projection 4a of the die 4 and communicates with an air supply passage 8 and a lubricating liquid supply passage 9 inside the die 4. The air supply passage 8 and the lubricant supply passage 9 are connected to the air connection passage 5 formed in the retainer 5.
a and the lubricating liquid connecting passage 5b are connected to the outside of the molding die 1 so that the lubricating liquid supplied from the outside of the molding die 1 is ejected from the ejection port 7 together with air.

The adjacent tooth-shaped projections 4 of the die 4
A discharge port 10 for the lubricating liquid is provided at an intermediate portion between the lubricating liquid injection port 10 and the groove 11 formed on the inner peripheral surface of the die 4 as shown in FIG. Exit 7
The lubricating liquid jet smoothly flows toward the discharge port 10 even when the lubricating liquid jet port 7 is closed by the panel P during molding.

The discharge port 10 communicates with the outside of the molding die 1 through a discharge path 12 provided in the die 4 and a discharge connection path 5c provided in the retainer 5. The lubricating liquid supplied from the lubricating liquid supply path 9 is ejected from the lubricating liquid ejection port 7 together with the air blown from the air connection path 5a and the air supply path 8 and then passes through the groove 11 to be discharged from the discharge port 10 to the discharge path. It is configured to be discharged to the outside of the molding die 1 through the discharge connection 12 and the discharge connection path 5c. In addition, the lubricating liquid is spouted from the lubricating liquid jet port 7,
The lubricating liquid recovered from the inner peripheral side of the die 4 or through the discharge path 11 and the discharge connection path 5c is circulated and used by a lubricating liquid circulating device (not shown).

In this embodiment, as shown in FIG. 3, a dimensional difference D is provided above and below the tooth-shaped projection 4a of the die 4 with the groove 11 interposed therebetween, and the inner diameter of the tooth-shaped portion is set in two stages. Thereby, the ironing rate at the time of molding is reduced, and the occurrence of molding defects such as wrinkles and the generation of heat are reduced.

Further, on the inner peripheral surface of the retainer 5, three connecting grooves 13 connected to the air supply path 8, the lubricating liquid supply path 9 and the discharge path 12 of the die 4 are respectively provided along the circumferential direction. The die 4 is also cooled from the outer peripheral side by passing the lubricating liquid through the connection groove 13.

In FIGS. 1 and 2, the number of the tooth-shaped projections 2a of the punch 2 and the number of the tooth-shaped projections 4a of the die 4 are smaller than the actual number, as in FIG. In addition, 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 the panel P is
After pressing so as not to shift, the die 4 is lowered together with the upper die, thereby forming a tooth-shaped projection on the side surface of the panel P.

At this time, the lubricating liquid is jetted out together with air from the lubricating liquid jet port 7 provided on each tooth-shaped projection 4a on the inner peripheral surface of the die 4, and the punch 2 and the panel P are inserted into the die hole before the start of molding. Before being inserted, the jetted lubricating liquid cools the inner peripheral surface of the die 4, and when the molding is started and the die 4 starts to descend, the lubricating liquid is uniformly jetted onto the panel P just before the molding. As a result, a lubricant layer is formed on the surface of the panel P, so that friction during molding is reduced.

During molding, the lubricating liquid jet port 7 of the die 4 is
Is closed by the panel P, the air outlet 7
Since the lubricating liquid ejected from the nozzle flows through the groove 11 to the discharge port 10, the lubricating liquid is supplied between the die 4 and the panel P to reduce friction, and the panel P and the die 4 are directly cooled. This prevents the temperature of the die 4 and the punch 2 from rising due to friction during molding.

Next, when the upper mold is raised, the panel P is discharged from the die 4 by the pad 3, and the clutch component 20 having the tooth-shaped projection 21 on the side surface as shown in FIG.
Can be obtained. Then, even during the rising of the upper mold after the completion of the molding, the lubricating liquid is sprayed onto the inner peripheral surface of the panel P and the die 4 after the molding, and the die 4 and the punch 2 are cooled. The temperature of the die 4 and the punch 2 hardly rises even if the above is repeated, and the dimensional accuracy of the molded product and the life of the molding die can be improved.

[0023]

As described above, the tooth forming mold according to the present invention has the above-mentioned structure, that is, the inner peripheral surface of the die has
Since the structure is provided with a spout for ejecting the lubricating liquid and a groove serving as a passage of the lubricating liquid at the time of molding, the lubricating liquid directly penetrates the panel and the die during molding as well as before and after the start of molding. Cooling and reducing friction between the two can effectively suppress the rise in the temperature of the die and punch, exhibiting extremely excellent effects such as improving the dimensional accuracy of the molded product and extending the life of the mold. Is what you do. Ma
In addition, drainage of the lubricating liquid communicating with the lubricating liquid ejection port through the groove is provided.
Since the outlet is provided, the panel
Lubricating fluid sprayed on
Collected from the outlet and recycled. Yo
As a result, the lubricating fluid flows,
Avoidable and more efficient die and punch temperature rise
Can be suppressed. Furthermore, it is connected to the lubricating liquid ejection port of the die.
The air supply path through which the air flows
Spraying the lubricating liquid with air
The liquid can be cooled, and the cooled lubricating liquid is
Panel and polish by spraying
Temperature rise can be suppressed even more efficiently.
You.

[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 partial perspective view of the inner peripheral surface of the die showing positions and shapes of a lubricating liquid ejection port, a discharge port, and a groove of the die shown in FIG.

FIG. 3 is an enlarged sectional view showing a tooth profile of the die shown in FIG. 1;

FIG. 4 is a perspective view showing the appearance of a member press-formed by the tooth forming mold shown in FIG.

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 4 (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tooth forming type 2 Punch 4 Dice 4a Toothed projection 7 Lubricant ejection port 8 Air supply path 10 Outlet 11 Groove

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21D 37/18 B21D 37/16 B21D 53/28 B21D 37/02 B21D 24/00

Claims (2)

(57) [Claims] 1. A gear-shaped punch having a plurality of tooth-shaped protrusions on a side surface, and a predetermined clearance between the punch and a tooth-shaped punch having a tooth shape corresponding to the tooth-shaped protrusions of the punch. comprising a toothed die inner forming a via a lubricating liquid ejection port for ejecting the lubricant to the inner circumferential surface of the die, a groove for passage of the lubricating liquid at the time of molding, the grooves
And a lubricating liquid discharge port communicating with the lubricating liquid ejection port . 2. The tooth forming die according to claim 1, wherein the die is provided with an air supply passage communicating with a lubricating liquid ejection port of the die.