JPS5886940A - Trimming press mold provided with scrap cutter - Google Patents

Abstract

PURPOSE:To decrease drawing depth, and to elevate yield of a material, by positioning a work by a positioning member of a rubber compound elastic body provided in the vicinity of a punch side scrap cutter. CONSTITUTION:A panel-like work W is placed on a punch 2, and the work W is positioned against the punch 2 by a positioning member 10 consisting of a rubber- based elastic body provided in a space S of each punch side scrap cutter 9. A punch holder descends, a die presses the work W, and by shearing action based on co-operation of a sectional die 7 and the punch 2, a flange part F containing a drawing wall part D is trimmed. Immediately after that, the punch 2 and the sectional die 7 are engaged with each other, and by its engaging amount l2, the positioning member 10 is bent. In this way, at the almost same time as the trimming working, the flange part F is divided finely by the scrap cutters 8, 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a press mold, and particularly to a press mold for performing shearing processing such as trimming.

2. Description of the Related Art Conventionally, there is a press die having a structure shown in FIG. 1, for example, as a press die equipped with a so-called scrap cutter for cutting scraps produced by press working. Fig. 1 shows an example of a press die for trimming, where 2 is a trimming punch mounted on the lower die holder 1, and 4 is a trimming die supported on the upper die holder 3 so as to face the punch 2. The die 4 is guided by a pad retainer 5 so as to move relative to the upper mold holder 3, and at the same time is urged downward by a spring 6. Furthermore, a sectional die 7 as a trimming cutting blade is attached to the lower end of the upper mold holder 3 so as to surround the entire circumference of the die 4.
A scrap cutter 8 on the upper side is appropriately provided on the upper side.

On the other hand, a lower scrap cutter 9 is appropriately provided at the outer station of the punch 2 so as to face the upper scrap cutter 8, and the upper and lower scrap cutters 8 and 9 cooperate with each other. Based on this, the scrap produced by the trimming process of the press die is cut into short pieces, as will be described later.

In the above configuration, first, when the panel-shaped workpiece W that has been patterned into a desired shape in the branching process is placed on the punch 2, the panel-shaped workpiece W is positioned with respect to the punch 2 at this time as shown in FIG. 7 of the workpiece periphery including the aperture wall
This is done by the wedge part 1 and the scrap cutter 9 on the lower side. Next, when the upper mold holder 3 is lowered, the die 4 first presses against the panel-shaped workpiece W and clamps the panel-shaped workpiece W between it and the punch 2. With the new function, the flange part F on the outer periphery of the workpiece is trimmed (C cut). In almost the same way that the sectional die 1 and the punch 2 work together, the scrap cutters 8.9 of both Achao and Roa also perform a new function. Due to the shearing action, the flange portion 1 is further divided into smaller parts, so that the flange portion r
In the end, it becomes a large number of short pieces of scrap.

In such a conventional press die, as described above, the positioning of the panel-shaped workpiece W with respect to the bonder 2 is performed in the second
As shown in the figure, since the drawing process is performed using the flange part 1 including the drawing wall part and the scrap cutter 9 on the lower side, if the drawing depth IIl in the previous drawing process p is made smaller,
There is a problem in that a person's life is lost due to a mistake. To explain, 11 in Fig. 2 is an essential dimension based on the amount of engagement between the punch 2 and the sectional die 1, and the sum of this amount of engagement 11 and the above-mentioned positioning measure is the aperture of the flange portion ν. Depth H
It is I. And if you take great advantage of the stability at the time of drying, the above-mentioned drawing depth H3 is at least 15 to 201 m11! Moreover, since the flange portion ν was turned into scrap, there was naturally a limit to improving the material yield.

In view of the above-mentioned points, this invention was made with the aim of improving the material yield by reducing the drawing depth H as much as possible. The scrap cutter has only the original function of cutting scrap, and the positioning of the workpiece is performed by a positioning member made of a rubber-based elastic body provided adjacent to the scrap cutter. be.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 3 shows the configuration of only the essential parts as an embodiment of the press mold according to the present invention, in which 2 is a trimming punch mounted on the lower mold holder 1 as the lower mold, and 1 is indicated by 1Ill. This is a sectional die attached to an upper die holder 3 serving as an upper die, and the outer circumferences of these punches 2 and sectional die 1 are arranged so that the punch side scrap cutters 9 face each other as described above.
Attach the die-side scrap cutter 8 to each piece.

Of these two scrap cutters 8.9, the punch-side scrap cutter 9 was fixed to the placket portion 2a formed on the outer circumference of the punch as shown in FIG. The upper end surface is lower than that of punch 2, and the amount of engagement with sectional die 1 between them! , is set.

As shown in FIG. 5, a rubber-based elastic material such as urethane, that is, a positioning member 10, is placed between the adjacent scrap cutters 9°9, as shown in FIG. It is located in.

This positioning member 1o has a support 10a, which is fixed to the placket part 2a by bolts or other fixing means (not shown), and whose upper end surface is the same as the upper end surface of the punch 2 on the free cotton. It is set so that it forms a plane.

In the above configuration, when the panel-shaped workpiece W, which has been previously drawn into a desired shape in the previous step, is placed on the punch 2, the panel-shaped workpiece W is positioned with respect to the punch 2 by the positioning member 1° as shown in FIG. done by. At this time, the scrap cutter 9 does not function as a positioning means.

Then, when the above-mentioned upper mold holder J descends.

First, the die 4 presses the panel-shaped workpiece W, and the flange part r including the drawing contact part is trimmed by the shearing action based on the cooperation of the sectional die 7 and the punch 2.
Next, due to the shearing action of both scrap cutters 8.9, the flange portion ν' is further divided into many short pieces of scrap. In other words, immediately after the flange portion ν is trimmed, the punch 2 and the sectional die 1 are engaged with each other, so the amount of engagement is 1.
The positioning member 10 is bent by an angle of 8°, which causes the scrap cutter to be moved to the 8° 9
The flange portion 1 is divided into smaller parts.

Here, as shown in FIG. 4 and FIG.
G is the amount of engagement between sectional die 1 and sectional die 1.

If the positioning amount by the positioning member 10 is Ll, and the aperture search of the 7-rank portion 1 of the panel-shaped workpiece W is H, then L,
mu, and also, is 1. Because it includes
The drawing depth Hl of the flange portion 1 is the conventional drawing depth H3.
This means that it can be made more comfortable and smaller than the previous model.

As is clear from the above description, according to the present invention, a positioning member made of a plurality of rubber-based elastic bodies is appropriately provided around the outer periphery of the punch, and the workpiece is positioned with respect to the punch by this positioning member, so that the drawing process is performed. Scrap can be reduced by reducing the drawing depth of the workpiece to the necessary minimum, thereby improving material yield.

[Brief explanation of drawings]

Fig. 1 is an explanatory cross-sectional view showing an example of a conventional press glue for trimming processing, Fig. 2 is an enlarged view of the main part showing details of the scrap cutter in Fig. IIEI, and Fig. 3 is an embodiment of the press mold of the present invention. As an example, a perspective view showing details of a punch including a scrap cutter and a double die;
11114 is a sectional view taken along the line ■--■ in FIG. 3, and FIG. 5 is a sectional view taken along the line 1--1 in FIG. 3. 2... Punch, 1... Sectional die, 8...
Dyke. Figure 1, 3 Figure 2 Figure 3 Bow

Claims (1)

[Claims] A trimming punch provided on a lower die, a lower scrap cutter attached to a detail of the punch, and a trimming die provided on an upper die. An upper scrap cutter is provided on the side of the die, and the panel positioned on the punch is trimmed by cooperation between the punch and the die, and the scrap portion generated by this trimming is removed by the upper and lower scrap cutters. I! In a press made for a tori construction machine which is designed to be cut by a spade, a support WJt for the edge of one panel is provided on the side of the punch, and a panel positioning member made of a shim-based elastic body is provided. Special 11 Trimming press type equipped with a scrap cutter.