JPH05245548A - Press die - Google Patents

Abstract

PURPOSE:To enable blanking and scrapping by one process. CONSTITUTION:A blanking blade 12 and scrapping blade 14 and 17 are alternatively and continuously provided on a lower die 11 and an upper die 15 respectively, a recessed part 20 is formed on the scrapping blade 14 on the lower side and a protruding part 21 is formed on the scrapping blade 17 on the upper side respectively, the protruding part 21 is engaged with a work W before the other parts and blanking and scrapping are carried out at the almost same time while deforming the work W in recessing/protruding shape alternatively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press die for punching.

[0002]

2. Description of the Related Art For example, a door panel of an automobile has a relatively large window 2 in an upper portion of a door body 1 as shown in FIG. 6, and when such a large window 2 is punched, If this is punched out integrally, the scrap to be scrapped becomes large and the processing becomes troublesome. Therefore, conventionally, as shown in FIG. 7, a pair of left and right first cutting blades 6 (one side is omitted) along the contours of both ends of the window 2 are provided in the lower mold 5 and arranged in the center of the lower mold 5. Windows 2 on support block 7
A pair of _second lines along the cutting lines L ₁ and L ₂ (Fig. 6) crossing the
Cutting blades 8 and 8 are provided, and cutting blades (not shown) corresponding to the first and second cutting blades 6 and 8 are provided on the upper die, and these upper and lower cutting blades are used to start the operation shown in FIG. The both ends and the portion of the window 2 shown in (1) are punched out, and then the process is moved to punch the central portion of the window 2 by a separately provided press die. In addition, W is a work as a door panel rough material obtained by drawing, and Wa is scrap generated by the punching.

[0003]

That is, according to the conventional processing method, it takes two steps to pull out one window, and it is inevitable that the installation space is enlarged, and the press type double investment is required. The increase in equipment cost due to
Moreover, there was a problem that productivity could not be increased as desired.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a press die capable of punching and scrap cutting in one step. It is in.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a lower die and an upper die with a punching cutting edge along the contour of a hole to be punched and a direction transverse to the hole. The scrap cutting blades that extend are connected to each other,
A recess is formed in at least a portion of the scrap cutting blade on the lower die side that is connected to the punching cutting blade, and scrap is cut in cooperation with the recess on the scrap cutting blade on the upper die side. It is characterized in that a convex portion is formed.

[0006]

In the press die configured as described above, since the scrap cutting blade on the lower die side is provided with the concave portion, the upper die punching blade is allowed to descend, and the upper and lower holes are allowed. Allows punching with the cutting blade. In addition, since the upper cutting scrap cutting blade is provided with a convex portion, the scrap part of the work deforms according to the uneven shape of the upper and lower scrap cutting cutting edges, and the upper and lower scrap cutting cutting blades are deformed. Enables scrap cutting with a blade. That is, punching and scrap cutting can be performed in one process, and the absolute width of the scrap portion is reduced by the deformation of the scrap portion, so that scrap can be easily dropped.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 4 show an embodiment of a press die according to the present invention. In this embodiment, the window 2 (FIG. 6) of the front door panel 1 is punched out, and in the figure, W indicates a work as a door panel rough material obtained by drawing. In these figures, 11 is a lower die, and the lower die 11 is provided with a ring-shaped punching blade 12 along the contour of the window (hole) 2 to be punched. Also lower mold 11
A pair of left and right support blocks 13 (one side is omitted) are arranged at the center of the support 2 extending in a direction traversing the window 2, and each support block 13 is provided with a scraping cutting blade 14. The scrap cutting blade 14 is arranged so that both ends of the scrap cutting blade 14 are inscribed in the punching cutting blade 12 (FIG. 1).
11 has a punching edge 12 and a pair of scrap cutting edges 14
The three punched areas are defined by.

Reference numeral 15 denotes an upper die which is disposed so as to face the lower die 11 and is supported by a press upper ram (not shown) and vertically moved integrally with the press upper ram. The upper die 15 is provided with a punching blade 16 along the contour of the hole 2 and a pair of scrap cutting blades 17 extending in a direction traversing the hole 2 so as to be connected to each other. These punching cutting blades 16,
Each of the scrap cutting cutting edges 17 is arranged in correspondence with the punch cutting edge 12 and the scrap cutting edge 14 of the lower die 11, so that the upper die also has three punching areas a, b, c.
(FIG. 4) is sectioned. In addition, each cutting edge of the upper mold 15
As shown in FIG. 4, 16 and 17 are formed by integrally combining a plurality of segments 18, and in particular, a connecting portion C between them (FIG. 4).
In the state where the scrap cutting edge 17 is interposed between the punching cutting edges 16, the tip edge of the scrap cutting edge 17 substitutes a part of the punching cutting edge (Fig. 3). Further, a pad 19 for pressing the work W against the punching cutting edge 12 of the lower die 11 is provided on the upper die 15 side.

Therefore, two recesses 20 are formed on the upper surface of the scrap cutting blade 14 provided on the lower die 13 on the inscribed side of the punching cutting blade 12 and on the inside thereof. On the other hand, a scrap cutting edge provided on the upper mold 15
Two convex portions 21 are formed on the lower surface of 17 corresponding to the concave portions 20. The general portions 14a and 17a of the concave portion 20 and the convex portion 21
The protruding heights h ₁ and h ₂ (Fig. 3) are almost the same, and as an example, when the thickness of the work W is 1 mm, it is 2 mm.
It is considered as a degree.

In the press die constructed as described above, as the upper die 15 descends, first, the convex portion 21 of the scrap cutting blade 17 on the upper die side engages with the work W, and the tip end side thereof is Edge 21a of convex portion 21 (FIG. 1) and cutting edge 12 for punching lower die 11
The work W is partially separated by. Then, when the upper die 15 is further lowered, the scrap portion of the work W is locally pulled and unevenly deformed by the convex portion 21 of the scrap cutting edge 17, and finally the scrap cutting edge 14 of the lower die is cut. It is pressed onto the recess 20 and then the whole work W is punched by the upper and lower punching cutting blades 16 and 12, and the scrap portion is cut (separated by the upper and lower scrap cutting blades 17 and 14). ) And so on progress almost at the same time, and scraps 23, 23 divided into three corresponding to the punching areas a, b, c ...
Drops into the lower mold 11 (Fig. 2). At this time, as described above, the scrap portion of the work W is deformed unevenly, so that the scrap portion Wa after the uneven deformation is deformed as shown in FIG.
Compared to the initial scrap portion W, ′ shrinks by δ on the end side, so that the finally separated scrap 23 can be easily dropped. This shrinkage allowance δ is for a work W having two concave / convex portions 20 and 21 as in the present embodiment and having a height of about 2 mm and a plate thickness of 1 mm. If it is, it will be about 1.5 to 2.0 mm.

In the above embodiment, the lower mold 11 and the upper mold
15 scraping cutting edges 14 and 17 with 2 concave and convex parts 20,
Although 21 is formed, the number of the concave / convex portions is arbitrary as long as at least one concave / convex portion is formed on the connecting portion side (end portion side) with the corresponding punching cutting edges 12 and 16. There may be only one or three or more. Further, in the above embodiment, the convex portion 21 is formed only on the scrap cutting edge 17, but the present invention, in addition to the convex portion 21, the cutting blade 16 for punching, scrap cutting on the lower die side. You may make it form a convex part also in the part which opposes the cutting edge 14 for use. In this case, since the work is cut off even at the portion above the scrap cutting blade 14 on the lower die side by the convex portion, the uneven deformation of the scrap portion becomes easier. However, in this case, the height of the convex portion needs to be lower than the height of the convex portion 21 of the scrap cutting blade 17 by the plate thickness of the work. Further, according to the present invention, the upper die 15 is provided with an elastic body made of polyurethane or the like, and at the same time as punching is completed, the elastic body is used for scraping.
It is also possible to press and urge the scrap 23, and in this case, the scrap 23 is more reliably dropped.

[0013]

As described in detail above, according to the press die according to the present invention, the punching and the scrap cutting can be performed in one process, so that the installation space can be reduced.
It has the effect of greatly contributing to the reduction of investment costs and the improvement of productivity. Further, since the scrap portion is deformed into an uneven shape, the scrap portion can be easily dropped and a stable punching process can be established.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a press die according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a front view taken along the line BB of FIG.

FIG. 4 is a schematic diagram showing the shape of an upper die cutting edge which constitutes the present press die.

FIG. 5 is a schematic view showing a shape of scrap punched out by the present press die.

FIG. 6 is a schematic view showing the shape of a door panel, which is one of the processing targets of this press die.

FIG. 7 is a cross-sectional view showing a structure of a conventional press die.

[Explanation of symbols]

 11 Lower die 12 Hole cutting edge 14 Scrap cutting edge 15 Upper die 16 Hole cutting edge 17 Scrap cutting edge 20 Recess 21 Convex 23 Scrap

Claims (1)

[Claims] 1. A lower die and an upper die each are provided with a punching blade along the contour of a hole to be punched and a scrap cutting blade extending in a direction traversing the hole so as to be connected to each other. A recess is formed in at least a portion of the scrap cutting blade on the lower die side that is connected to the punching cutting blade, and scrap is cut in cooperation with the recess on the scrap cutting blade on the upper die side. A press die having a convex portion formed.