JPS6145946Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a forging die device with front and back extrusion.

Conventionally, when forging product a such as a shaft member, as shown in Figure 1, material b is formed into the shape shown in parentheses in a forward and backward extrusion process, then reversed and formed into product a in an upsetting process. was. As described above, several steps are required, and each step requires annealing, lubrication, and a mold for molding, making production time-consuming.

The present invention was devised in view of the above circumstances, and its purpose is to provide a forging die device that can perform front and back extrusion forming in one step instead of requiring several steps as in the past, thereby increasing productivity. The aim is to improve the

Hereinafter, the present invention will be explained with reference to FIG. 2 and subsequent figures.

In the drawing, reference numeral 1 denotes a slide, and an upper die set 2 is fixed to the slide 1. A shrink ring 4 is provided to the upper die set 2 via a holder 3, and a punch 5 is attached to the shrink ring 4. Retained.

The punch 5 has a small diameter hole 6 and a large diameter hole 7 formed concentrically, and the tip surface of the punch 5 is tapered at an angle θ of about 5 degrees so as to apply a compressive load to the inside. An upper mandrel 19 is slidably inserted into the punch 5.

8 in the drawing is a bolster, a lower die set 9 is fixed to the bolster 8, and a die holder 11 is provided to the lower die set 9 via a die holder 10. In the die holder 11, the gap between the punch 5 and the die member 12 at the part A where the punch 5 enters the die member 12 is made as small as possible, so that when internal pressure is applied to the punch 5, the die member 12 acts as a shrink ring. to reinforce punch 5.

The die member 12 has an insertion hole 13 into which the punch 5 is inserted, and a small diameter hole 1 having a smaller diameter than the insertion hole 13.
4 is formed. A lower mandrel 15 and a knockout tube member 17 are inserted into the small diameter hole 14.
is attached to a plate 16 fixed to the lower diamond set 9, and the knockout tube member 17 abuts at its lower end a block 18 which is slidable relative to the lower mandrel 15.

In the drawing, reference numeral 20 denotes an upper knockout pin, and this upper knockout pin 20 is in contact with the upper end surface of the upper mandrel 19.

In addition, 21 in the drawing is a lower knockout pin, and the lower knockout pin 21 is connected to the block 1.
It is in contact with the lower surface of 8.

Then, insert the material 23 shown in FIG.
3 is forged by front and back extrusion, the slide 1 is raised, and the upper and lower knockout pins 20, 21 are actuated to remove the molded product from the mold apparatus, yielding a product 23' shown in FIG.

During the forward and backward extrusion process of the material 23, since the tip of the punch 5 has a tapered part, the punch 5 receives a compressive load from the material 23, and the punch 5 and the die member 12 in the part A of the punch 5 that enters the die member 12. Since the gap between the punch 5 and the material 23 is small, when internal pressure is applied to the punch 5 by the material 23, the die member 12 acts as a re-linking ring and reinforces the punch 5. Not damaged.

The present invention has been detailed above, and slide 1
A punch 5 attached through a shrink ring 4 to an upper die set 2 provided at , the upper mandrel 19 slidable by the upper knockout pin 20 is inserted into the punch 5, and the insertion hole 13 into which the punch 5 is inserted into the die member 12 attached to the lower die set 9 provided on the bolster 8 and this Insertion hole 1
A lower mandrel 15 supported by the lower die set 9 and a lower mandrel 15 which is slidably fitted into the lower mandrel 15 and supported by a lower knockout pin 21 are formed in the small diameter part 14. Since the tube member 17 for knockout is inserted, it is possible to perform front and rear extrusion molding in one process using such a mold device, and the production cost is lower than the conventional method that requires several processes, and the delivery time is shortened. Productivity can be improved by shortening the time.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the forming process from material to product using a conventional forging die, Fig. 2 is a longitudinal cross-sectional view of an embodiment of the present invention, and Fig. 3 is an explanatory diagram of the forming process using the mold device according to the present invention. It is an explanatory diagram. 1 is a slide, 2 is an upper die set, 5 is a punch, 8 is a bolster, 9 is a lower die set, 12 is a die member, 15 is a lower mandrel, and 19 is an upper mandrel.

Claims (1)

[Scope of utility model registration request] A punch 5 attached to an upper die set 2 provided on the slide 1 via a shrink ring 4 is provided with a small diameter hole portion 6 and a large diameter hole portion 7, and the end face of the punch 5 is formed into an outwardly inclined taper portion. The upper mandrel 19 slidable by the upper knockout pin 20 is inserted into the punch 5, and the insertion hole 13 into which the punch 5 is inserted into the die member 12 attached to the lower die set 9 provided on the bolster 8. A small diameter part 14 smaller in diameter than this insertion hole part 13 is formed, and a lower mandrel 15 supported by the lower die set 9 and this lower mandrel 1 are formed in this small diameter part 14.
5 and a knock-out tube member 17 slidably fitted on the knock-out pin 21 and supported by a lower knock-out pin 21.