JPH0415378Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a press mold for performing precision punching.

(Prior art) In a conventional press die, as shown in FIG. By holding the upper die stripper 6, holding the punch 8 and lower die stripper 9 in the lower die holder 7, attaching the upper die holder 4 and the lower die holder 7 to a press (not shown), and driving the press to move it up and down. It is common to punch out the outer peripheral shape 3 of the product 2.

(Problem to be solved by the invention) However, in the precision punching press mold shown in FIG. Since it is necessary to punch out while restraining, the dimensional accuracy of the punched product is good, but there is a problem in that it is difficult to take out the product.

The present invention was developed in order to solve the above problems, and its purpose is to provide a press mold that improves the dimensional accuracy of punched products and also makes it easier to take out the products. do.

[Structure of the invention] (Means for solving the problem) The press mold of the invention has a cam plate consisting of a vertical part and an inclined part whose tip spreads outward in the upper mold holder, and the lower mold The holder is provided with an insert having a cam hole that engages with the cam plate so as to be slidable horizontally on the upper surface of the lower stripper, and a gap is provided between the lower stripper and the lower cutter. It has the following characteristics.

(Function) According to the press die of the present invention, when the upper die holder is lowered, the lower die cutter and the insert of the lower die stripper come into close contact, and the hoop material of the punched material is held between the upper and lower strippers. During punching and when the upper die holder is raised, the lower die cutter and the insert of the lower die stripper are separated to form a space so that the punching chips can fall out.

(Example) First example of the press mold of the present invention
This will be explained with reference to FIGS. 4 to 4. An upper die holder 15 holds a die 16 having an outer circumferential shape 3 of the product 2 on its inner circumference, and an upper die stripper 18 is held on the inner circumference of the die 16 via a compressed compression coil spring 17. . On the other hand, the lower die holder 19 holds a punch 22 having a punch cutting surface 20 and a punch side surface 21 that are compatible with the die 16. A lower die stripper 23 is held on the outer periphery of the punch 22 via a compressed compression coil spring 24. At the top of the lower stripper 23, there is a insert 2 held by the lower stripper 23 in a movable state parallel to the cutting surface 20 of the punch.
5 is installed. A slanted cam hole 26 is provided in the insert 25, and a cam plate 27 whose tip end is slanted is engaged with this cam hole 26. A gap 28 is provided between the lower die stripper 23 and the punch 22, and the insert 2
Scrap 29 when 5 is farthest from punch 22
A dropout hole 30 is formed through which the material can fall. Nesting child 2
Hoop materials 1 made of thin iron plates are sequentially fed onto the upper surface of the hoop 5.

Now, in FIG. 1, the upper mold holder 15 is lowered by a press (not shown), and thereby the die 16, upper mold stripper 18, and cam plate 27 held by the upper mold holder 15 are also lowered. As the cam plate 27 descends, the insert 25 that engages with the slanted end of the cam plate 27 and the cam hole 26 is rotated by the slanted part of the cam plate 27 into the side surface of the punch in a direction parallel to the cutting surface 20 of the punch. The insert 25 receives a force in the direction approaching 21.
When approaching the punch 22 and touching the side surface 21 of the punch, the cam hole 26 engages with the vertical portion of the cam plate 27. At this time, the cam plate 27 no longer applies force to the insert 25, and the insert 25 is fixed at this position. As the hoop material 1 further descends, as shown in FIG.
be bound by. When the hoop material 1 is further lowered, the die 16 and the punch 22 engage with each other as shown in FIG. 3, and the hoop material 1 is punched out in a restrained state. Next, the upper die holder 15 begins to rise by a press (not shown), and together with the die 16, the upper die stripper 18, and the cam plate 27, the lower die stripper 18 begins to rise.
and the insert 25 held by the lower mold stripper 23
moves away from the hoop material 1 and releases the restraint. When the cam plate 27 rises further and engages with the cam hole 26 at the inclined part of the cam plate 27, the insert 25 is inserted into the punch 22 in a direction parallel to the cutting surface 20 of the punch 22.
The insert 25 receives a force in the direction of moving away from the punch 2.
As shown in FIG. 4, the punch 22
A dropout hole 30 is formed between the insert 25 and the lower mold stripper 23, and the punched scrap 29 falls through the dropout hole 30. On the other hand, the punched product 2 remains on the upper surface of the punch 22, and is pushed out of the press die by feeding the next hoop material 1, resulting in the state shown in FIG. 1. This cycle is repeated and the hoop material 1 is restrained and punched every cycle of the vertical movement of the press, thereby obtaining a press mold from which only the product can be taken out of the mold.

[Effects of the invention] This invention performs punching while the hoop material is restrained by the nesting action of the upper die stripper and the lower die stripper, so the product does not warp and the punched surface (sheared surface) Since it can also be machined at right angles, the dimensional accuracy of the punched product is significantly improved. Further, since the punched scrap insert is moved horizontally by the cam plate to form a dropout hole, it can be easily dropped and the product can also be easily taken out of the mold.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the press mold of the present invention. Figure 1 is a sectional view when the upper mold holder is raised, and Figure 2 is a cross-sectional view when the hoop material is restrained. 3 is a sectional view when punching is completed, FIG. 4 is a sectional view when the scrap is falling, and FIG. 5 is a sectional view showing a conventional mold. 1...Blanking, 15...Upper mold holder, 16...
Upper type cutter, 18... Upper type stripper, 19...
Lower die holder, 22...Lower die cutter, 23...Lower die stripper, 25...Insert, 26...Cam hole,
27...Cam plate, 30...Dropout hole.

Claims (1)

[Scope of utility model registration request] An upper die holder, an upper cutter fixed to the upper die holder, an upper die stripper adjacent to the upper cutter and tensioned by a spring, a lower cutter that engages with the upper cutter, and a lower cutter attached to the upper die. In a press mold consisting of a lower die stopper adjacent to a die cutter and tensioned by a spring, and a lower die holder to which these lower die cutters and lower die stripper are attached, the upper die holder has a vertical portion and its tip. A cam plate consisting of an outwardly expanding sloping part is implanted, a nest having a cam hole that engages with the cam plate is provided so as to be horizontally slidable on the upper surface of the lower mold stripper, and the lower mold stripper A gap is provided between the lower die cutter and the lower die stripper so that when the upper die holder is lowered, the lower die cutter and the insert of the lower die stripper come into close contact, and when the upper die holder is raised, they are separated to form a space. A press mold featuring: