JPS6257721A - Punching method for clad sheet - Google Patents

Abstract

PURPOSE:To form the good coated end face with less drop by using the clad sheet on which annular groove is provided at the punch side in case of punching the clad sheet composed of a surface layer material and base metal by using the punch having roundness at the corner part. CONSTITUTION:The clad material1 composed of a surface layer material 2 and base metal 3 is placed on a die 8 and punched with pressure by the punch 7 having roundness on the corner part. In this case the drop part 5 is remarkably reduced with the use of the clad material 1 providing annular groove 6 in advance. It is deformed on the way of working, but the rupture is progressed along the broken line A connecting the bottom of the annular groove 6 and die corner thereafter. The good work of the clad material is therefore realized with less drop and thicker thickness of the coating on the punched end face 4 due to the rupture without causing a big constriction.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to a method for punching out a clad plate consisting of a surface material and a base material, and particularly to a method for punching out a clad plate in which the punched end surface of the base material is coated with the surface material. This relates to a punching method.

[Background of the invention]

FIG. 5 is a sectional view showing a clad plate made of one surface layer material and a base material.

In FIG. 5, 2 is the surface material of a thin plate made of high-grade material (for example, 5US304), 3 is the base material of a thick plate (for example, 5 pcc), which is a low-grade material, and 1 is the surface material of the thin plate made of high-grade material 2 and the base material. This is a clad plate consisting of 3 parts.

FIG. 6 is a cross-sectional view showing the clad plate 1 when it is punched using an ordinary punch and die.

In FIG. 6, reference numeral 4 indicates a punched end face, and the base material 3 is exposed at this portion, which poses a problem in terms of corrosion resistance and design.

To avoid this, there is a known method of rounding the cutting edge of the tool, for example, as shown in "Press Technology" Volume 8, No. 7, Page 8 (published in July 1972). ing.

FIG. 7 is a cross-sectional view showing the state when the clad plate 1 is punched by this method.

According to this method, the punched end face 4 is covered with the surface material 2 and the base material 3 is not exposed, so that the corrosion resistance is greatly improved, but a new problem of drooping 5 occurs.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above, and to provide a method for punching a clad plate in which the punched end face of a base material is coated with a surface material and there is less droop.

[Summary of the invention]

In order to achieve the above objects, 1 the present invention is a method for punching out a clad plate consisting of a surface material and a base material, in which an annular groove is provided in advance on the surface material side near the punching of the clad plate, and a punch with a rounded cutting edge is used to punch out the clad plate. The present invention is characterized by realizing punching of a clad steel plate with less weeping and a thick end face coating by punching the plate.

[Embodiments of the invention]

An example of the present invention will be described below using SUS 5040 surface material (
A specific example will be explained in which a clad plate made of a base material (thickness 90% of the total plate thickness) with a thickness of 10% of the total plate thickness and a base material of 5 pcc is punched.

Figure 2 shows a clad plate with an annular groove in advance, and Figure 1 shows the clad plate shown in Figure 2 being punched out using a punch with rounded corners. It is a sectional view showing the state (a state on the verge of breakage), and FIG. 3 is a sectional view showing the state when the punching process is completed.

In these figures, 6 is a groove provided on the punch side of the clad plate 1, 7 is a punch with rounded corners, and 8 is a groove provided on the punch side of the clad plate 1.
is die.

When a clad plate is punched using a punch with an angular radius of 1/2 of the total plate thickness, the amount of droop d/l reaches 23 inches (where t indicates the amount of metal plate).

By using a cladding plate pre-provided with an annular groove, as shown in FIG. 2, the sag is greatly reduced. That is, during the punching process, the die is deformed as shown in FIG. 1, but after that, breakage occurs along the broken line A connecting the bottom of the annular groove 6 and the die angle. The conventional processing method without the annular groove 6 is shown by the broken line B.

A break occurs connecting the center of the rounded arc of the punch and the corner of the die, but in this case, due to the ductility of the crush plate, a large constriction occurs near the break, and then the break occurs, so no one can It becomes larger and the thickness of the coating becomes thinner. On the other hand, when there is an annular groove 6, the breakage occurs without causing a large constriction, so the sag is small and the coating thickness is thicker. A coating is obtained.

The annular groove can be easily formed by coining with a press, cutting, laser processing, or the like.

FIG. 4 shows another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a state in which a clad plate is punched using a punch having an annular protrusion and rounded corners. Here, 9 is a punch having an annular projection 10 and rounded corners, 11 is a back pressure punch, and 12
is a back pressure spring.

The punching method shown in FIG. 4 allows coining and punching to be performed in the same mold.

It works like this:

First, the cladding plate 1 is placed on a backpressure punch 11 built into the die 8, and pressurized by the punch 9 having an annular protrusion 10 and rounded corners. As a result, an annular groove is formed in the cladding plate 1. In addition,
The back pressure spring 12 must have the necessary rigidity to form this groove. When the punch 9 further descends, the back pressure punch 11 also descends, and punching is performed. In this way, the annular groove is formed in the clad steel plate 1 by the annular projection 10, as described above. As in the case of using a clad steel plate with an annular groove provided in advance, droop can be significantly reduced.

Although the above embodiments have been described with respect to a clad plate made of SUS 304 and 5 pcc, the same method can be applied to a combination of other materials or a clad plate having surface layer materials on both sides.

〔Effect of the invention〕

As described in detail above, according to the present invention, the amount of time needed to coat the punched end face with the surface layer material is reduced to a mere 100%, thereby greatly improving the design of the product.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the method for punching a clad plate according to the present invention, FIG. 2 is a sectional view showing a clad plate having an annular groove, and FIG. 3 is a sectional view showing a clad plate punching method according to the present invention. 4 is a sectional view showing another embodiment of the clad plate punching method according to the present invention; FIG. 5 is a sectional view for explaining the clad plate; FIGS. 6 and 7 are cross-sectional views showing a clad plate punched according to the prior art. −. ------- Clad plate 2---------Surface material

Claims (1)

[Claims] 1. A cladding characterized in that, in punching a cladding plate made of a surface material and a base material with a punch having rounded corners, a cladding plate having an annular groove provided on the punch side is used. How to punch out a board. 2. The method for punching out a clad plate according to claim 1, wherein an annular groove is formed in the clad plate using a punch having an annular projection.