JPH0441022A - Die for trimming press - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is useful for trimming a non-product area attached to the peripheral edge of a drawn workpiece, for example, and simultaneously dividing the non-product area into a plurality of scrap pieces. This invention relates to a trimming press mold that is divided into parts.

Conventional technology For example, when drawing an automobile body panel, etc., there is a frame-shaped non-product on the peripheral edge of the workpiece W, which is a panel after drawing, as a blank hold part (wrinkle holding trace), as shown in Fig. 5. A region Q (the hatched region in FIG. 5) will be attached.

Therefore, in order to trim the above-mentioned non-product area Q in a later process, scrap cutters are provided in the upper and lower dies of the trimming press mold, as shown in Japanese Patent Publication No. 61-50058, At the same time, the non-product area Q is cut along a plurality of cut lines Lc by the shearing action between the upper and lower scrap cutters. Dividing into short scrap pieces S is performed.

As shown in FIGS. 6 and 7, the scrap cutter 21 on the lower mold side is installed at a position lower than the cutting edge 23 of the outer periphery of the punch 22, which serves as the lower mold, while the upper surface is used for non-products. It has a shape corresponding to the cross-sectional shape of the partial region Q, and also has the function of positioning the workpiece W placed on the punch 22.

Problems to be Solved by the Invention In the conventional trimming press mold, in order to reduce the area of the non-product region Q as much as possible and improve the material yield, the engagement length between the workpiece W and the scrap cutter 21, That is, it is desirable to reduce the engagement length B from the trim line Lt in FIG. 7.

However, reducing the dimension 83 means that the thickness of the vertical wall portion 24 of the scrap cutter 21 is 1. As a result, the strength of the vertical wall portion 24 is insufficient, and, for example, the cutting edge portion 25 of the scrap cutter 21 is damaged, resulting in an extremely shortened service life of the scrap cutter 21 and an increase in maintenance man-hours. increases.

Therefore, there is naturally a limit to reducing the above-mentioned 80 dimension, and it has been extremely difficult to simultaneously improve the material yield and extend the life of the scrap cutter.

The present invention was made in view of the above problems.
The purpose is to provide a structure that can both improve material yield and extend the life of the scrap cutter.

Means for Solving the Problems As described above, the present invention trims the non-product area attached to the peripheral edge of a workpiece formed into a predetermined shape by the shearing action of the upper and lower dies, and at the same time In the trimming press mold, the non-product region is divided into a plurality of short scrap pieces by a scrap cutter provided in the lower mold, a receiving groove for receiving the scrap cutter is formed on the outer periphery of the lower mold, and the receiving groove is It is characterized by fitting the vertical wall of the scrap cutter on the lower die side.

According to this structure, even if the above-mentioned engagement length B is reduced by making a part of the scrap cutter substantially bite into the lower die side, the thickness of the vertical wall of the scrap cutter is immediately reduced. does not become smaller and can maintain the specified strength required for the scrap cutter.

Embodiment FIGS. 1 and 2 are diagrams showing an embodiment of the present invention.
2 is a punch serving as a lower mold, and 2 is a scrap cutter on the lower mold side. As shown in FIG. 5, the scrap cutters 2 are individually arranged along the outer circumference of the punch 1 at positions corresponding to the cut lines Lc. A receiving groove 4 is formed in the punch 1 by cutting out a part of the cutting edge 3.
The vertical wall portion 5 of the scrap cutter 2 is connected to the receiving groove portion 4.
are mated.

As shown in FIG. 5, the scrap cutter 2 has a cutting blade part 6 for dividing the non-product area Q into a plurality of short scrap pieces S, and also has a cutting blade part 6 aligned with the cutting blade 3 on the punch l side. An auxiliary cutting edge portion 7 forming a part of this cutting edge 3 is formed.

According to this structure, in order to reduce the non-product area Q as much as possible and improve the material yield, the engagement length B from the trim line Lt is made smaller than the conventional dimension B (Fig. 7). Even if the thickness is significantly reduced, the thickness t2 of the vertical wall portion 5 of the scrap cutter 2 is still the same as the conventional 1. It is possible to secure dimensions that are equal to or greater than the dimensions.

Therefore, as mentioned above, it is possible to make the dimension B significantly smaller than the conventional one, and at the same time, to make the vertical wall portion 5 of the scrubber/brush cutter 2 have a strength equal to or greater than that of the conventional one. This makes it possible to prevent the cutting edge portion 6 from falling off or the like.

3 and 4 show another embodiment of the invention, in which the punch 1 is formed with a receiving groove 9 having an inclined surface 8 at its upper end and ending just below the cutting edge 3. , the scrap cutter 10 is formed with an inclined surface 11 corresponding to the inclined surface 8 on the punch 1 side, and the vertical wall portion 12 of the scrap cutter 10 is aligned with the receiving groove portion 9 so that these inclined surfaces 8 and 11 coincide with each other. They are fitted together.

In the case of this embodiment as well, the engagement length B from the trim line Lt is small (even if it is, the thickness dimension t3 of the vertical wall portion 12 other than the upper end portion is a necessary and sufficient dimension for the function of the blank holder 10). Since it is possible to ensure this, the same effects as in the first embodiment can be obtained.

Effects of the Invention As described above, according to the present invention, a receiving groove for receiving a scrap cutter is formed in the outer periphery of the lower mold, and the vertical wall of the scrap cutter on the lower mold side is fitted into this receiving groove. Therefore, even if the engagement length between the scrap cutter and the workpiece is reduced in order to improve the material yield, the vertical wall of the scrap cutter can have an extra thickness equal to the depth of engagement with the punch. The thickness dimension does not become smaller in accordance with the above-mentioned engagement length.

Therefore, it is possible to provide sufficient strength as a scrap cutter, and it is possible to improve the material yield and extend the life of the scrap cutter without causing the chipping of the blade or the increase in maintenance man-hours associated with the conventional method. .

[Brief explanation of drawings]

FIG. 1 is a perspective view of main parts showing the first embodiment of the present invention, and FIG.
The figure is a vertical sectional view of FIG. 1, FIG. 3 is a perspective view of the main part showing the second embodiment of the present invention, FIG. 4 is a vertical sectional view of FIG. 3, and FIG. 5 is a perspective view of the main part of the workpiece. 6 is a perspective view of a main part showing an example of a conventional trimming press type, and FIG. 7 is a vertical sectional view of FIG. 6. DESCRIPTION OF SYMBOLS 1... Punch (lower die), 2.10... Scrap cutter, 4, 9... Receiving groove part, 5, 12... Vertical wall part,
Lt...trim line, Q...non-product area, S...
...Scrap piece, W...work. Figure 1 1: Poshiboshi 2' Swara 1 Tsua sword 1 Rita 4, receiving groove 5: Burial Sugaya Figure 5 S Niskra Oni Rippu Figure 6

Claims (1)

[Claims] (1) At the same time, the non-product area attached to the peripheral edge of the workpiece formed into a predetermined shape is trimmed by the shearing action of the upper and lower dies, and at the same time, a plurality of non-product areas are trimmed using the scrap cutter provided on the upper and lower dies. In a trimming press mold designed to divide scrap into short pieces, a receiving groove for receiving a scrap cutter is formed on the outer periphery of the lower mold, and a vertical wall of the scrap cutter on the lower mold side is fitted into this receiving groove. A trimming press type characterized by the combination of