KR20150096980A

KR20150096980A - Punching method of soft metal plate

Info

Publication number: KR20150096980A
Application number: KR1020140017947A
Authority: KR
Inventors: 이찬영
Original assignee: 주식회사 동양전기
Priority date: 2014-02-17
Filing date: 2014-02-17
Publication date: 2015-08-26

Abstract

According to the present invention, a punching method for a soft metal plate to make holes on a soft metal plate using a punch wherein an uneven groove is formed on a lower bottom, and a ring-shaped blade protrudes downwards from the lower edge. As such, the punching method for soft metal plate prevents a periphery of the holes from being dented to eliminate a post process to prevent and remove the dents; thus reducing the number of processes, and reducing a processing time and costs.

Description

[0001] The present invention relates to a punching method of a soft metal plate,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching method of a metal plate, and more particularly, to a method of punching a metal plate for machining a hole in a metal plate of a soft material.

Generally, punching is a forging operation in which a hole is formed by punching a steel ingot or a steel strip. The punching method can be used for machining a hole in a copper plate of a soft material used as a medium or large-sized electric switch or a substrate. However, in the case of a copper plate made of a soft material, the punching process surface is not clean due to its ductility characteristics, and as the thickness of the copper plate is thicker, deformation occurs in which punching holes are depressed in the punching direction. When the periphery of the hole is depressed, electric resistance increases at a depressed portion and heat generation may occur. Further, the depressed portion is very difficult to be removed even in a subsequent process.

In order to solve this problem, a method of gradually increasing the size of the holes by performing punching several times is used, but the number of punches is increased, so that the cost is increased and the number of processes is increased to increase the processing time. Further, when a drilling method is used when machining holes in the copper plate, there is a disadvantage in that the machining time is long and the machining cost is high during drilling.

Korean Patent Publication No. 10-1049228

It is an object of the present invention to provide a punching method of a metal plate which is capable of minimizing the deformation around a hole when machining a hole in a metal plate made of a soft material, thereby reducing processing time and processing cost.

A method of punching a metal plate according to the present invention comprises the steps of: forming a cylindrical recess in a central portion of a lower end surface of the metal plate and a cylindrical punch protruding downward at a lower end edge thereof and having a ring- Wherein the thickness of the blade is set equal along the circumferential direction and the projecting length of the blade is in a range of about 0.65 to about 0.85 times the thickness of the rolled metal plate, And the thickness of the blade is set within a range of about 0.05 to 0.15 times the diameter of the punch and the diameter of the groove is set within a range of about 0.7 to 0.9 times the diameter of the punch.

A method of punching a soft metal plate according to the present invention comprises the steps of machining a hole in a metal plate made of a soft material by using a punch having a groove formed at the center of the lower end face and a ring- Since the depressing phenomenon is prevented around the hole, the subsequent process for preventing the depression or removing the depression is not required, so that the number of processes can be reduced and the processing time and the processing cost can be reduced.

Further, by making the protruding length of the blade of the punch to be in the range of about 0.55 to about 0.75 times the thickness of the rolled metal plate, it is possible to easily process the metal plate having a thick rolled material, There is an advantage to be minimized.

1 is a diagram schematically illustrating a punch according to an embodiment of the present invention.
Fig. 2 is a view of the punch shown in Fig. 1 viewed from direction A. Fig.
3 is a view showing a punching method of a loose metal plate using the punch shown in Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram schematically illustrating a punch according to an embodiment of the present invention. Fig. 2 is a view of the punch shown in Fig. 1 viewed from direction A. Fig.

1 and 2, the punch 10 has a cylindrical shape, a groove 12 is formed at the center of the lower end surface, and a ring-shaped blade 14 protruding downward is formed at the lower end edge .

The groove (12) is formed such that the side surface and the bottom surface are perpendicular to each other.

The blade 14 protrudes downward between the outer surface 10a of the punch 10 and the groove 12. The protruding length h2 of the blade 14 is set within a range of about 0.65 to 0.85 times the thickness h1 of the metal plate 2. The blade 14 may break if the protruding length h2 of the blade 14 is greater than 0.85 times the thickness h1 of the rolled metal plate 2. If the protruding length h2 of the blade 14 is shorter than 0.65 times the thickness h1 of the rolled metal plate 2, a depression may occur around the hole during perforation of the rolled metal plate 2. Preferably, the protruding length h2 of the blade 14 is within the range of 0.75 to 0.85 times the thickness h1 of the rolled metal plate 2, which is set to 0.8 times in the present embodiment. do.

The lower end surface 14a of the blade 14 is formed to be inclined upwards at a predetermined angle? In the direction toward the groove 12. Preferably, the angle of inclination of the blade is about 15 degrees.

The diameter d1 of the groove 12 is set within a range of about 0.7 to 0.9 times the diameter D of the punch 10 and the thickness d2 of the blade 14 is set to be within a range Is set within a range of about 0.05 to 0.15 times the diameter (D). If the thickness d2 of the blade 14 is thicker than 0.15 times the diameter D of the punch 10, it is possible to achieve a clean cutting effect, such as a recess in the periphery of the hole when drilling the metal plate 2 I can not see. In addition, if the thickness d2 of the blade 14 is less than 0.05 times the diameter D of the punch 10, the blade 14 can easily break. In this embodiment, the diameter d1 of the groove 12 is about 0.8 times the diameter D of the punch 10 and the thickness d2 of the blade 14 is less than the diameter D of the punch 10 For example, about 0.1 times as much as that of the first embodiment.

SKD-11, SHS-51 to SHS-55 materials are used for the punch 10.

The rolled metal plate 2 is a plate made of an annular material having a small hardness and a small hardness, and is a plate made of copper (Cu) in this embodiment.

3 is a view showing a punching method of a loose metal plate using the punch shown in Fig.

Referring to FIG. 3, the punching method of the soft metal plate 2 is as follows.

3A and 3B, after the punch 10 is moved downward from the upper side of the rolled metal plate 2, the punch 10 is moved to the hole processing position of the rolled metal plate 2, And the hole 4 is machined. At this time, since the loose metal plate 2 is punctured by the ring-shaped blade 14, no depression phenomenon appears around the hole 4. Accordingly, since the subsequent process for preventing the depression or removing the depression is not necessary, the number of processes can be reduced and the processing time and the processing cost can be reduced.

3C, when the punch 10 is lifted after the hole 4 is machined, the metal plate 2 rises upward in the vicinity of the hole 4 due to the soft material characteristic of the metal plate 2, The right surplus portion 4a can be formed.

As shown in Fig. 3D, when the periphery of the hole 4 above the loose metal plate 2 is pressed by the pressing member 20, the excess portion 4a can be flattened. Since the step of planarizing the excess portion 4a is much simpler than the steps of preventing or eliminating the depression, processing time and processing cost can be minimized.

When the thickness h1 of the rolled metal plate 2 is increased, the protruding length h2 of the blade 14 of the punch 10 is adjusted according to the thickness h1 of the rolled metal plate 2 , The hole 4 can be machined. Therefore, if the thickness of the metal plate is too thick, there is no depression around the hole due to the nature of the soft material, so that the productivity can be increased and the processing time and processing cost can be reduced. Therefore, there is an advantage that hole processing can be easily performed on a metal plate made of a soft material.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

2: loose metal plate 4: hole
10: punch 12: groove
14: blade 20: pressing member

Claims

A hole is formed in a predetermined position of the metal plate by using a cylindrical punch having a cylindrical groove formed at the center of the lower end face and a ring shaped blade which is protruded downward at the lower end edge and upwardly inclined in the direction toward the groove &Lt; / RTI >
Wherein the thickness of the blade is set to be the same along the circumferential direction and the protruding length of the blade is set within a range of about 0.65 to about 0.85 times the thickness of the rolled metal plate and the thickness of the blade is about the diameter of the punch 0.05 to 0.15 times,
Wherein a diameter of the groove is set within a range of about 0.7 to 0.9 times the diameter of the punch.

The method according to claim 1,
Wherein the step of machining the hole comprises:
Moving the punch downward toward the loose metal plate;
Passing the punch through a predetermined position of the loose metal plate to process the hole;
And removing the punch and pressing the periphery of the hole by using a pressing member on the upper side of the loose metal plate to planarize the flattened metal plate.

The method according to claim 1,
Wherein the rolled metal plate comprises a copper plate.