JPH0788571A - Method for working metal plate - Google Patents

Abstract

PURPOSE:To form a joining part (micro-joint part) of a metal plate material and a product part having strength strong enough to be carried and facility to be cut-off and for which finishing after cutting-off is not required. CONSTITUTION:On order easily cut-off plural product parts 2 from the metal plate material 1 in the final stage of working, the micro-joint part 3 is provided on a part of blanked part 4 of the outer circumferential edge of product parts 2 and the micro-joint part 3 is blanked by about half thickness of it and a half blanked part 5 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet metal working method which mainly uses a punch press machine to machine a plate material to be processed, and separates a product portion in the plate material to be processed at the final stage of the processing. .

[0002]

2. Description of the Related Art As a method of processing a sheet metal part, there is a method of forming a micro joint part and separating a product part at the final stage of the process. Conventionally, as shown in FIG. 3, a punching machine 16 is used to form a punched portion 16 in a slit shape along the outer peripheral edge of a product portion 14 in a plate material 13 to be processed of a sheet metal. The punched portion 16 between the product portion 14 and the plate material 13 to be processed is left with several thin connecting portions. This connecting portion is referred to as a micro joint portion 15. By providing the micro joint portion 15, a large number of product portions 14 are arranged in the plate material 13 to be processed, and after the punching work is completed, the individual product portions 14 are connected,
The plate material 13 to be processed can be transported for further processing. Therefore, there is a feature that the labor of the work can be saved because the product portions 14 do not come apart during the transportation or the processing until the final stage of separating the product portions 14.

A processing method of this kind is disclosed in Japanese Patent Publication No. 02-27049 and Japanese Patent Application Laid-Open No. 02-25 by the same applicant as the present application.
No. 1321 publication is known. However, if the size of the tip of the micro joint is large and the strength for holding the product portion 14 is too strong, a special cutting tool is required at the time of cutting the product portion, or even if it is cut as shown in FIG. Burrs 17 remain on the product, which may require finishing.

Particularly, in Japanese Patent Application Laid-Open No. 02-251321, by setting the tip shape of the micro joint portion to an angle of less than 90 degrees, when the punched product is cut off, the remaining portion of the irregular shape (burr or burrs It is described to prevent burrs). However, even in this case, it is difficult to completely remove burrs and burrs, and the amount of burrs and burrs has been reduced by making the micro joints as small as possible. As a result, conversely, the product part 14
Sometimes fell off and fell apart.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to ensure that the holding strength of the product portion of the micro joint portion is sufficient to withstand conveyance and that the product is It is an object of the present invention to provide a sheet metal working method which can easily separate parts without requiring a special cutting tool and does not require finishing work after the separation.

[0006]

In order to solve the above-mentioned problems, the sheet metal working method of the present invention, when punching and forming a plurality of product parts from a plate material to be processed, along the outer peripheral edge of the plurality of product parts. A punching step in which a micro joint part is left in a part of the slit-shaped punching part,
After this punching step, a step of further extruding a part of the micro joint portion by a dimension of approximately half the plate thickness is performed.

[0007]

The punching and punching of a normal press machine are performed by shearing, and the cut end is composed of a shear surface and a fracture surface as shown in FIG. According to the above-described sheet metal working method of the present invention, a part of the micro joint portion is punched out by about half the thickness of the plate, so that the product portion and the plate material to be processed are connected at a part of the fracture surface of the micro joint portion. Be placed in Since it is connected only by the connecting part of the fracture surface that does not fall off during transportation, at the final stage of separating the product part, the product part can be easily pushed from the plate material by pushing the product part with a slight force. It can be cut into pieces, leaving no burrs or burrs.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the plate material 1 to be processed is punched by a punch press machine to form a plurality of product parts 2 therein, and then the product part 2 is cut out. Punch the periphery. That is, the punching process of the punching part 4 is performed so as to leave the micro joint part 3. After that, the micro joint part 3 is about 1 / about the width of the punched part 4.
The half blank portion 5 is formed by the extrusion process with a length of 2 and an extrusion dimension of about half the plate thickness. After that, the plate material 1 to be processed is conveyed to the next processing step, the product portion 2 is further processed, and the product portion 2 is separated.

Extrusion processing of the micro joint portion 3 will be described in detail. As shown in FIG. 2, the die 9 of the press machine is provided with the recessed portion 12 corresponding to the extrusion amount of the product portion 2 (about half of the plate thickness), and the micro joint portion 3 is aligned with the recessed portion 12. The plate material 1 to be processed is placed and the punch 8 is lowered. As a result, the half blank portion 5 is formed. At the boundary between the half blank portion 5 and the product portion 2 and the micro joint portion 3, the shear surface 6 is completely separated, the fracture surface 7 is also cracked, and a very small portion of the fracture surface 7 is joined. Only. This connecting part 11
The half blank portion 5 and the product portion 2, and the micro joint portion 3, that is, the product portion 2 and the plate material 1 to be processed are connected to each other to hold the product portion 2.

Since the connecting portion 11 of the half blank portion 5 is connected with a very small size due to the occurrence of cracks, it can be easily separated by lightly pressing the product portion 2 by hand. In addition, the state of the fractured surface after separation does not require burrs or burrs and does not require finishing.

[0011]

As described above, according to the present invention, by providing the half blank portion in the micro joint portion,
The joint between the plate material to be processed and the product portion can be made very small. Therefore, the product portion can be easily separated from the plate material to be processed, the product portion is free from burrs and burrs, and the finishing process after the separation is unnecessary, so that the work efficiency is improved and the product quality is improved. Further, there is an effect that the product portion does not fall off during transportation or post-processing.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part formed by the method of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a formation state by the method of the present invention.

FIG. 3 is a diagram showing a micro joint portion.

FIG. 4 is a view showing a product separated by a conventional method.

[Explanation of symbols]

 1 Work plate material. 2 product parts. 3 Micro joint section. 4 Punching part. 5 Half blank part. 6 Shear surface. 7 Fracture surface. 8 punches. 9 dice. 10 Who are you? 11 Joint part. 12 Recessed part.

Claims (1)

[Claims] 1. A sheet metal working method for punching and forming a plurality of product parts (2) from a plate material (1) to be processed, which has a slit shape along an outer peripheral edge of the plurality of product parts (2). A punching step in which the microjoint portion (3) is left in a part of the punched portion (4) to form a punch, and after this punching step, a part of the microjoint portion (3) is cut by about half the plate thickness. A sheet metal working method comprising: an extrusion step of extruding to form a half blank portion (5).