JP2000210727A - Punching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably conduct punching without complicating a working process while preventing generation of scrap floating by arranging a squeezing means for conducting squeezing at a punching part of a work. SOLUTION: A projecting part 1A for squeezing is arranged to an upper die 1. A material 3 to be worked is arranged on the upper face of a lower die 4, and by descending the upper die 1, squeezing is done to the material 3 by the projecting part 1A. Internal strain due to plastic deformation is generated around a squeezed part 3A. After working, the upper die 1 is ascended and the material 3 is moved, the squeezed part 3A is arranged at the position where a punch 2 and a cutting edge 4A are arranged. By descending the upper die 1, the material 3 is held between the upper die and lower die 4, and by descending the punch 2, the squeezed part 3A and its periphery and punched. A squeezing means 1A is preferably constituted so as to squeeze 30-60% of the thickness of the material and a size of 0.1-0.5 mm smaller a punching dimension and to work a dot like pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching apparatus, and more particularly to a punching apparatus for punching a workpiece placed on a die by moving a punch up and down.

[0002]

2. Description of the Related Art In a conventional punching apparatus, scum generated when a workpiece placed on a die is punched by a punch may be lifted up from the die surface, resulting in reduced productivity. . In order to prevent such scraps from rising, for example, a method of welding metal to the inner surface of the die to increase the frictional force with the scraps, or applying a small chamfer to the die cutting edge to cause the scraps to bite into the inner surface of the die There are known ways to increase the pressure.

[0003] According to such a method for preventing dregs rising,
There is a problem in that the configuration of the punching apparatus becomes complicated and periodic maintenance of the mold is required to maintain the processing accuracy.

[0004] As a punching apparatus for simplifying the structure of the punching apparatus and improving the quality of a processed product, for example,
There is one disclosed in Japanese Patent Publication No. 8-4846.

[0005] This punching apparatus is capable of processing a punched portion having an uneven portion for forming a stamp on a workpiece, a stamping portion for stamping a stamp forming region, and a punch for punching the workpiece after stamping. It is arranged in the material transfer direction.

In the above-described punching apparatus, a stamp corresponding to a punching shape is formed on a workpiece, and then a stamping portion is partially sheared while stamping a stamp forming region, thereby elastically deforming a waste portion. Let it. This workpiece is transferred to the upper surface of the die, and the non-sheared portion of the stamp forming area is punched by a punch, whereby the punched waste is elastically deformed and comes into close contact with the inner surface of the die. Through such processing steps, the manufacture and assembly of the mold can be simplified, the durability by repeated use of the mold can be improved, and the quality of the processed product can be improved.

[0007]

[Problems to be solved by the invention]
According to the punching apparatus disclosed in Japanese Patent No. 846,
Since many steps such as stamping, embossing, and punching are required, there is an eye for improving productivity. Further, when the friction between the scum and the inner surface of the die is obtained by the elastic deformation of the scum, the state of contact with the inner surface of the die becomes unstable due to the punched shape of the scum, and the scum may easily be raised. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a punching apparatus capable of avoiding complication of a processing step, preventing generation of waste, and enabling stable punching.

[0008]

According to the present invention, there is provided a punching apparatus for punching a workpiece mounted on a die by punching the workpiece.
A punching apparatus having a crushing means for crushing a punched portion of the workpiece is provided.

In the above-described punching apparatus, it is preferable that the crushing means performs a crushing process of 30 to 60% of the thickness of the workpiece and 0.1 to 0.5 mm smaller than the punching size. The punched portion may be crushed in a predetermined pattern such as a groove or a dot.

According to the above-described punching apparatus, internal strain is generated by crushing a workpiece. When a predetermined range including the crushed portion is punched, the punched portion (scrap) elongates due to internal stress based on internal strain, and the friction between the die inner surface and the scrap increases.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a punching apparatus according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a punching apparatus according to an embodiment of the present invention, in which an upper die 1 having a convex portion 1A for crushing, a punch 2 provided on the upper die 1 so as to be able to move up and down, and a punch 2 are shown. An insertion portion 1B to be inserted into the upper die, a lower die 4 disposed on the upper surface so as to transfer the workpiece 3, and a lower die 4 provided on the lower die 4 to shear the workpiece 3 based on the lifting and lowering operation of the punch 2. It has a cutting edge 4A and a cutting edge 2A formed at the tip of the punch 2 and punching out a crushed portion 3A of the workpiece 3, and the punch 2 moves a predetermined distance from the convex portion 1A in the transfer direction of the workpiece 3. It is arranged at a distance. The workpiece 3 is transported in the direction of the arrow by a transport mechanism (not shown).

FIG. 2 shows the convex portion 1A. The convex portion 1A has a height h of 30 to 60% of the thickness of the workpiece and a length 1 of 0.1 to 0.5 mm smaller than the punched size. It is formed as follows.

The operation of the punching apparatus according to the present invention will be described below.

When the workpiece 3 is placed on the upper surface of the lower mold 4 and the upper mold 1 is lowered, the workpiece 3 is crushed by the projections 1A. Internal distortion due to plastic deformation occurs around the crushed portion 3A. After the working, the upper die 1 is lifted to move the workpiece 3, so that the crushed portion is arranged at a position where the punch 2 and the cutting blade 4A are provided.

FIG. 3 shows punching of the workpiece 3. When the punch 2 is lowered while the upper die 1 is lowered and the workpiece 3 is held between the upper die 1 and the lower die 4, a crushed portion and The surrounding area is punched.

FIG. 4 shows the workpiece 3 in which a crushed portion 3A having been subjected to a crushing process of length 1 and width w, and a punch 2
An opening 3B is formed by punching (not shown). After the formation of the crushed portion 3A, the workpiece 3 is transferred in the direction of the arrow, and the punch 2 (not shown) crushes the processed portion 3A by a length 0.1 to 0.5 mm larger than the length 1 and the width w of the crushed portion 3A. By forming the opening 3B by punching with l ′ and width w ′, the length and width direction elongation based on the internal strain of the punched scum is maximized. As a result, friction between the scum and the inner surface of the lower mold 4 is increased, and the scum is prevented from rising.

According to the above-described punching apparatus, a crushing process is performed on a portion of the workpiece 3 that will become the waste 3B, and then the punch 3 is used to punch out the waste 3B.
Since the elongation based on the internal strain is generated, the increase in the number of processing steps can be minimized, and the friction between the waste 3B and the lower mold 4 can be increased. Further, since the crushed portion 3A is removed as the scum 3B, the quality of the product after punching is not reduced.

In the present embodiment, the rectangular crushed portion 3A is formed by crushing. However, for example, a plurality of grooves may be formed by crushing. In this case, the amount of internal distortion can be adjusted by forming the groove in a rectangular or V-shaped cross section. The same effect can be obtained even if a plurality of dot patterns are formed by crushing.

[0020]

As described above, according to the punching apparatus of the present invention, since the crushing means for crushing the punched portion of the workpiece is provided, it is possible to avoid complication of the processing step and to increase the dregs. Can be prevented and stable punching can be performed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a punching apparatus according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of a punching apparatus according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram showing an operation of the punching apparatus according to the embodiment of the present invention.

FIG. 4 is a plan view showing a workpiece according to the embodiment of the present invention.

[Explanation of symbols]

 1, upper die 1A, convex part 1B, insertion part 2, punch 2A, cutting blade 3, workpiece 3A, crushed part 3B, opening 4, lower die 4A, cutting blade

Claims (3)

[Claims] 1. A punching apparatus for punching a workpiece placed on a die by punching the workpiece, comprising a crushing means for crushing a punched portion of the workpiece. Punching equipment. 2. The crushing means has a thickness of 30 to 60% of a thickness of the workpiece, and 0.1 to 0.5 m from a punching size.
2. The punching apparatus according to claim 1, wherein the punching apparatus is configured to perform crushing processing of a size smaller by m. 3. The punching apparatus according to claim 1, wherein said crushing means is configured to crush the punched portion in a predetermined pattern such as a groove or a dot.