JPH0357517A - Press working device - Google Patents

Abstract

PURPOSE:To improve accuracy of shape of an emboss part by pressing down directly a pad with an upper holder by bringing the surfaces of stoppers into contact with each other at the position of the bottom dead center where the working of the emboss part and a pierced hole is ended. CONSTITUTION:A piercing punch 14 is elastically supported on the upper holder 3 with use of an elastic material 12 and the pierced hole H is worked in the emboss part E in cooperation with a lower die (punch) 1. The emboss part E is formed at a sectional punch part 7 preceding the piercing punch 14. At the position of the bottom dead center where the working of the emboss part E and the pierced hole H is ended, the pad 4 is directly pressed down with the upper holder 3 by bringing the stoppers 8,9 into contact with each other. By this way, even if the depth of the emboss part is deeper, the emboss part is reasonably formed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combined press processing apparatus that is capable of forming an embossed part on a workpiece and forming a pierced hole in the embossed part in one step.

Conventional technology As an example of this type of composite press processing equipment, for example,
There is one disclosed in No. 9 165725. As shown in Fig. 5, this press working device 1δ is designed to form a hole H in the center of the seat Q at the same time as forming an embossed seat Q. A piercing punch 51 is fixed to an upper mold body 52, and a punch portion 54 for forming the seat portion Q is integrally formed on the top 53 which is elastically supported by the upper mold body 52.

Therefore, as the upper die main body 52 descends relative to the lower die 55 on which the workpiece W is positioned, the pad 53, which descends before the piercing punch 5l, pressurizes and restrains the workpiece W. The seat portion Q is formed in cooperation with a button die 56 that constitutes a part of the lower die 55. When the upper mold main body 52 continues to descend, the pad 53 that has finished forming the seat portion Q compresses the elastic body 57 and lowers the upper mold main body 5.
2, a hole H is formed in the center of the seat part Q by shearing action based on the engagement between the piercing punch 51 and the button die 56.

Problems to be Solved by the Invention According to the conventional structure shown in FIG.
Even if the upper mold body 52 is lowered to the bottom dead center position, the upper mold body 52 cannot directly press the pad 53.The press forming force required to form the seat part Q is -1.1 mold body 52 and the pad 53.
It depends on the spring constant of the elastic body 57 interposed between. As a result, the molding of the seat Q is unstable, and there is a limit to the improvement of its shape accuracy, and when the depth of the seat Q becomes large, it becomes difficult to mold the seat Q. Furthermore, in order to ensure the stroke of the piercing punch 51, it is necessary to increase the stroke of the butt 53 with respect to the upper die body 52.

The present invention was made in view of the above problems.
The purpose is to provide a complex press processing device that can form an embossed part corresponding to the seat part and pierce the embossed part at the same time, while also forming the embossed part with high precision. It's about doing.

Means for Solving the Problems The present invention provides an embossed portion for a workpiece by cooperation of a mold consisting of an upper holder and a pad elastically supported by the upper holder so as to be movable downward in an L direction, and a lower mold. In a press processing device that forms the embossed part and pierces the embossed part, the holder is elastically supported by the upper holder so as to be movable downward, and a downward biasing force is applied by the elastic body. A piercing punch that works with the mold to form a piercing hole in the embossed part, and a sectional punch that is provided on a part of the panod that descends before the piercing punch and that shapes the embossed part by working with the lower mold. The piercing punch is attached to the upper die and the elastic means is attached until the upper die is just before the bottom dead center or until it reaches the bottom dead center position.
A pierce punch restraining means which restrains the Nippier punch in a raised and retracted position against the biasing force, and releases the restraint of the Nippier punch when the upper die is just before the bottom dead center or reaches the bottom dead center position, and causes the pierce punch to perform a processing operation. , stopper surfaces are provided on both the upper holder and the pad, and come into contact with each other when the upper mold reaches the bottom dead center position to restrict the ascending and descending position of the pad with respect to the upper holder.

As the above-mentioned piercing punch restraining means, in addition to a cam mechanism provided between the upper holder and the pad, a direct-acting actuator such as an air cylinder or a hydraulic cylinder is used.

-4 Action According to this structure, the sectional punch part of the pad descends before the piercing punch, and the embossed part is shaped in advance until the upper die is just before the bottom dead center or descends to the bottom dead center position. In this case, the piercing punch restraining means restrains the piercing punch in the raised and retracted position so that the piercing punch does not come into contact with the workpiece.

When the upper die descends to just before the bottom dead center or to the bottom dead center position, the pierce punch restraint means releases the pierce punch, and the pierce punch moves downward due to the biasing force of the elastic means, thereby preventing cooperation with the lower die. Processing the repair hole.

Then, when the J: mold reaches the bottom dead center, the pad bottoms out against the upper holder due to the contact between the stoppers, so the upper holder directly pushes the pad completely, and this causes the embossed part to Forming accuracy is guaranteed.

Embodiment FIG. 1 is a diagram showing a first embodiment of the present invention, in which 1 is a punch as a lower die, 3 is an upper holder that constitutes an upper die 2 together with a panno 4, and the punch 1 is equipped with a punch for piercing holes. A pot die 5 is provided.

The bath 4 is elastically supported by the upper holder 3 through a urethane rubber 6 so as to be movable downward, and a sectional punch portion 7 for forming the embossed portion E is integrally formed in a portion thereof. Both the one holder 3 and the pad 4 are formed with mutually opposing strut bar surfaces 8 and 9, and the abutment of these strut bar surfaces 8 and 9 causes the panod 4 to rise with respect to the upper holder 3. The limit position is regulated.

On the other hand, the soil holder 3 is provided with a holder block 11 that is guided by a guide pin 10 and is movable downward. A downward force is always applied.

A dog l3 is integrally formed at the lower end of the holder block 11, and a piercing punch I4 for piercing holes facing the pot die 5 is fixed via a punch retainer 15.

7 Further, a drive cam 16 adjacent to the holder block 11 is integrally provided on the upper holder 3, and on the other hand, a slide cam 17 facing the drive cam 16 is provided on the upper surface of the vanod 4. The drive cam 16 and the slide cam 17 are each formed with an inclined cam surface 18 or 19, and furthermore, the slide cam 17 has a protruding portion 20 facing the dog 13 at its end.

The slide cam 20 is capable of horizontally sliding the pad 4'' and is biased in the direction of arrow A in FIG. 1 by a return spring (not shown).

Here, the drive cam 16 and slide cam 17 described in ``2''
and the shoulder portion 20 constitute a piercing punch restraining means 21, which resists the biasing force of the coil spring 12 until the upper die 2 reaches the bottom dead center immediately before or at the bottom dead center position, as described later. This serves to restrain the piercing bolt 14 in the raised and retracted position.

In the press processing apparatus constructed in this way, as shown in FIG. lower it.

When the upper die 2 descends, the vane 4, which descends before the piercing punch 14, pressurizes and restrains the workpiece W made of punch 1 soil, and the base 4 bends the urethane rubber 6 while moving it relative to the upper holder 3. By moving upward, the sectional punch portion 7 and the punch 1 work together to draw and form the embossed portion E (see FIG. 3).

At this time, the dog 13 and the shoulder part 20 move upward relative to the upper holder 3 as shown in "2".
3, and the holder block 11 is pushed against the force of the coil spring 12. As a result, the piercing punch 14 is restrained in the raised and retracted position so that the piercing punch 14 does not come into contact with the workpiece W.

When the upper die 2 continues to descend and reaches just before the bottom dead center as shown in FIG. moves backward in the direction opposite to the direction of arrow A. When the slide cam 17 retreats, the donogger 13 and the shoulder part 2
The restraint due to contact with 0 is released, and the piercing punch 14
is moved downward together with the holder block 11 by the force of the coil spring 12. As a result, the piercing punch 14 engages with the button die 5 as shown in FIG.
A piercing hole H is formed in the center of the hole.

When the pierced hole H is completely formed, the upper mold 2 has reached the bottom dead center position, and as shown in FIG. 3, the situation is so-called bottoming out. That is, the upper holder 3 directly presses the vane 4 at the bottom dead center position, thereby serving to improve the shape accuracy of the embossed portion E.

When the piercing hole processing is completed and the upper mold 2 starts to rise again,
The slide cam I7 gradually advances in the eight directions of the arrow, and the shoulder part 20 comes into contact with the dowel part 13, until it reaches a predetermined height. When the first mold 2 rises and the coil spring 12 expands and contracts, the holder block 11 moves forward. It is raised integrally with the upper holder 3.

Waiting for the holder bracket 11 to rise, the slide cam 17 returns to its initial position as shown in FIG.

FIG. 4 shows a second embodiment of the present invention, which differs from the first embodiment in that an air cylinder 3l is used as the piercing punch restraining means.

As shown in FIG.
An air cylinder 31 having a pin 32 that can be brought into contact with is provided, and the piercing punch 14 is restrained in the raised and retracted position by the contact between the dog 13 and the bottle 32 until the upper die 2 reaches the bottom dead center position. With the upper die 2 stationary at the bottom dead center position, the pin 32 is moved backward by the air cylinder 31, and the piercing punch 14 is operated for machining.

According to this embodiment, the pierced hole H can be machined when the upper mold 2 reaches the bottom dead center position and the shape of the embossed portion E is determined, and the shape accuracy of the pierced hole I4 itself can be improved.

Effects of the Invention As described above, according to the present invention, the upper holder directly presses the pad due to the abutment of the stone bar surfaces at the bottom dead center position where the embossed part and the pierced hole have been processed. Compared to conventional structures that rely only on elastic bodies for forming force, the shape accuracy of the embossed part can be greatly improved, and even if the depth of the embossed part becomes large, it can be formed without difficulty.

Further, since the piercing punch can move up and down with respect to the upper holder, there is no need to increase the stroke of the pad with respect to the upper holder in order to ensure the machining stroke of the piercing punch unlike in the conventional structure.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the first embodiment of the present invention, and is an explanatory diagram of the structure showing the bottom dead center position of the upper mold, and FIG. 2 is a construction explanatory diagram showing the top dead center position of the upper mold. , FIG. 3 is a configuration explanatory diagram showing a state in which the upper mold is located just before the bottom dead center, FIG. 4 is a configuration explanatory diagram showing the second embodiment of the present invention, and FIG. 5 is a conventional press working diagram. FIG. 2 is a configuration explanatory diagram showing an example of a device. I...Punch as a lower die, 2...Upper die, 3...
Upper holder, 4...pad, 6...urethane rubber, 7
...Sectional punch portion, 8.9... Strike collar surface, 11... Holder block, 12... Koinore spring as elastic means, 14... Piercing punch, 1
6... Drive cam, 17... Slide cam, 18
．． 19... Inclined cam surface, 20... Part of shoulder, 2
l...Earring punch restraining means, 31...Air cylinder as piercing punch restraining means, 32...Bin, E
...Embossed part, H...piercing hole, W...work.

Claims (1)

[Claims] (1) An upper mold consisting of an upper holder and a pad that is elastically supported by the upper holder so as to be able to move up and down, and a lower mold form an embossed part on the workpiece and make a piercing hole in this embossed part. In a press processing device that performs processing, the pierce is elastically supported by the upper holder so that it can move up and down, and a downward biasing force is applied by the elastic body, which works with the lower mold to form a pierced hole in the embossed part. a punch; a sectional punch section that is provided on a part of the pad that descends before the piercing punch and forms the embossed part in cooperation with the lower die; and a sectional punch section that is provided on the upper die when the upper die is just before the bottom dead center. Alternatively, the piercing punch is restrained in the raised and retracted position against the biasing force of the elastic means until it reaches the bottom dead center position, while the piercing punch is held just before the bottom dead center or when the upper die reaches the bottom dead center position. A piercing punch restraining means is provided on both the upper holder and the pad, and when the upper mold reaches the bottom dead center position, the pad against the upper holder comes into contact with each other. A press working device comprising: a stopper surface for regulating the ascending and descending position of the press machine.