JPS6299100A - Method of punching clad steel plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for punching a clad steel plate consisting of a surface layer material and a base material, and in particular, a method for punching out a clad steel plate consisting of a surface layer material and a base material, and in particular, a method for punching a clad steel plate consisting of a surface layer material and a base material, and in particular, a method for punching a clad steel plate consisting of a surface layer material and a base material. The present invention relates to a method for punching out a clad steel plate as described above.

[Background of the invention]

First, a clad steel plate and a conventional punching method for punching holes therein will be explained using drawings.

FIG. 5 is a cross-sectional view of a clad steel plate, and FIG. 6 is a cross-sectional view of a clad steel plate punched by a conventional punching method.
FIG. 7 is a sectional view showing a clad steel plate punched by another conventional punching method.

In FIG. 5, 2 is a high-grade material (for example, Sv s s
oa) thin plate surface material, 3 is a low grade material (for example, 5P
The clad steel plate 1 is made up of the surface layer material 2 and the base material 3.

When a hole is punched into this clad steel plate 1 by a conventional punching method using an ordinary punch and die, the base material 6 is exposed at the punched end face 4, as the cross section is shown in FIG. The corrosion resistance of that part deteriorated, and the design quality was also poor.

Other conventional punching methods are known in order to prevent the base material from being exposed on the punched end face in this way (Press Technology Vol. 8, No. 7, p. 8, July 1972). This punching method uses a punching tool with a rounded cutting edge, and the clad steel plate punched by this method has a punched end surface 4 with the surface layer as shown in the cross section of FIG. Since it is covered with material 2, the base material 3 is no longer exposed. However, since the sag portion 5 is generated and the amount d of the sag is large, there is a problem that although the corrosion resistance is improved, the design is inferior.

[Object of the Invention] The present invention improves the problems of the prior art described above, and provides a method for punching a clad steel plate in which the punched end face of the base material is coated with a surface layer material and the amount of sagging is small. This is the purpose.

[Summary of the invention]

The configuration of the method for punching a clad steel plate according to the first invention is as follows:
In a clad steel plate punching method in which a clad steel plate consisting of a surface layer material and a base material is punched using a punch and a die, the clad steel plate is formed by forming an annular groove in the base material in advance with approximately the same diameter as the inner diameter of the die. The clad steel plate is placed on the die with the base material side facing down so that the annular groove and the die are concentric, and the plate is punched using a punch having rounded corners and the die. It is something.

The second aspect of the method for punching a clad steel plate according to the first invention is a method for punching a clad steel plate consisting of a surface layer material and a base material using a punch and a die. A die is formed with an annular protrusion on the inner diameter edge, and a clad steel plate is placed on the die with the base material side facing down, and pressurized from the surface material side with a plate holder to form an annular groove in the base material. Punching is performed using a punch with rounded corners and the die.

More specifically, in the method KTh of punching a clad steel plate consisting of a surface material and a base material, the thickness of the base material near the punched part of the clad steel plate is thinned in advance, so that the cutting edge at the corner is rounded. A method for punching a clad steel plate that reduces the amount of sagging even when using a punch with a sharp edge.

[Embodiments of the invention]

Hereinafter, the present invention will be explained by examples.

FIG. 1 is a cross-sectional view of a main part showing a state of punching by a method for punching a clad steel plate according to an embodiment of the first invention, FIG. 2 is a cross-sectional view of a main part of the clad steel plate in FIG.
FIG. 3 is a sectional view showing a comfortable part of a clad steel plate punched by the method of punching a clad steel plate according to FIG. 1.

In the figure, 9 is a die, 7 is a punch with a rounded corner 7α, 8 is a plate holder having a hole 8α through which the punch 7 passes, and the punch 7 is attached to the ram of the press. The punch holder (not shown) is fixed to the pressurizing plate.

1A is a clad steel plate consisting of a surface layer material 2 and a base material 3A, and an annular groove 6 having approximately the same diameter as the inner diameter of the die 9 is previously formed in the base material 3A of the clad steel plate 1A.

This annular groove 6 can be formed by, for example, coining by pressing,
It can be easily formed by cutting, laser processing, etc.

First, the clad steel plate 1A is placed on the die 9 with the base material 3A side facing down so that the annular groove 6 and the die 9 are concentric.

Here, when the press is turned ON, the punch 7 descends together with the ram, and the lower end of the punch 7 hits the clad steel plate 1A.
The clad steel plate 1 comes into contact with the surface material 2 of the
A is punched inside the annular groove 6. The plate holder 8 is pressurized by a compressive force generated by a disc spring (not shown) inserted between the punch holder and the plate holder 8, and this pressing force causes the punched clad steel plate 1A to be pressed into the die. 9
Pressed by The punch 7 rises together with the ram and separates from the clad steel plate 1A, and the plate holder 8 also separates, and as shown in FIG. A punched clad steel plate 1A having a small td is obtained.

The reason why the amount of droop d decreases in this way is that by forming the annular groove 6 in the clad steel plate 1A, the thickness of the punched portion decreases, and therefore the plastic deformation area during punching process decreases. It is.

A specific example will be shown.

Plate thickness t consisting of surface material 2 (plate thickness 0.2 m) made of material 5US304 and base material 5A (plate thickness tafi) made of material 5 pcc
==0.2+1.8=2.0m clad steel plate 1A base material 3A, diameter 10m, depth 1. An OH annular groove 6 is formed, and the roundness of the corner 7α of the clad steel plate 1A is to
When punching was performed using a W (=t/2) punch 7, the ratio of the depression f#d of the depression portion 5A to the plate thickness t of the clad steel plate 1A was cl/l =: 14%.

On the other hand, the clad steel plate 1 without the annular groove 6 (
When a material (0 dimensions are the same as those of the above-mentioned example) was punched out in the same manner as in the above-mentioned example, the ratio of the amount of sag to the thickness of the clad steel plate 1 was d/l ==
It was 23%.

According to the embodiment described above, the surface layer material 2 is provided on the punched end face 4.
This has the effect that the amount of sagging d is significantly reduced compared to the conventional method, and the design is improved.

In this embodiment, the clad steel plate 1A is pressed by the plate holder 8, but the plate holder 8 may not be used.

Next, the second invention will be explained in detail.

FIG. 4 is a sectional view of a main part showing a state of punching by a method of punching a clad steel plate according to an embodiment of the second invention.

In FIG. 4, the same parts as in FIG. 1 are denoted by the same numbers. 9A is a die in which an annular projection 9b is formed on the inner diameter edge of the die upper surface 9α. Punch 7 is
As in the previous embodiment, it is fixed by a punch holder (not shown) to a pressure plate attached to the ram of the press. Further, the plate holder 8 is attached to this punch holder via a disc spring (not shown).

First, place the clad steel plate 1 into the die 9A with the base material 3 side down.
Place it on top.

Now, when the press is turned on, the ram descends,
First, the lower surface of the plate presser 8 comes into contact with the upper surface of the clad steel plate 1. When the ram further descends, the disc spring is compressed and a spring force is generated, which causes the clad steel plate to
is pressed, the annular projection 9h of the die 9A is pushed into the base material 3, and an annular groove is formed in the base material 3. Next is punch 7
The clad steel plate 1 comes into contact with the upper surface of the plate 1, and further descends to punch out the clad steel plate 1 inside the annular groove.

After that, the ram rises, the punch 7 rises and separates from the clad steel plate 1, and the plate presser 8 also separates, so that the punched end surface of the base material 3 is coated with the surface material 2 as shown in FIG.
Punched clad steel plate 1 with small droop amount d at the droop portion
is obtained.

A specific example will be shown.

A clad steel plate 1 made of the same material and having one dimension as in the specific example is pressed with a punch 7 of the same dimension and a die 9A (annular protrusion 9).
When punching was performed using the diameter IQw of b and the height 041), the ratio of the amount of sagging of the sagging portion d to the thickness tVc of the clad steel plate 1 was reduced to d/l = 15%.

This embodiment also has the effect that the surface material 2 is coated on the punched sea surface and the amount of sagging d is significantly reduced compared to the conventional method.

In each of the above embodiments, a case has been described in which a clad steel plate in which the surface layer material is 5US304 and the base material is 5 pcc is punched. It can also be applied to punching clad steel plates made of nickel and a base material of 5 pcc, and other clad plates, such as clad plates made of SU 5304 as the surface material and aluminum as the base material.

〔Effect of the invention〕

As described in detail above, according to the present invention, the punched end face of the base material is coated with the surface layer material.

It is possible to provide a method for punching a clad steel plate with a small amount of droop.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part showing a state of punching by a method for punching a clad steel plate according to an embodiment of the first invention, FIG. 2 is a cross-sectional view of a main part of the clad steel plate in FIG.
FIG. 3 is a sectional view showing the main part of a clad steel plate punched by the method for punching a clad steel plate according to FIG. 1, and FIG. 4 is a method for punching a clad steel plate according to an embodiment of the second invention. FIG. 5 is a cross-sectional view of a clad steel plate, FIG. 6 is a cross-sectional view of a clad steel plate punched by a conventional punching method, and FIG. 7 is a cross-sectional view of a clad steel plate punched by another conventional punching method. It is a sectional view showing a clad steel plate punched by a punching method. 1.1A...Clad steel plate

Claims (1)

[Scope of Claims] 1. In a clad steel plate punching method in which a clad steel plate consisting of a surface layer material and a base material is punched using a punch and a die, the clad steel plate is preliminarily stamped on the base material with a diameter that is approximately the same as the inner diameter of the die. A clad steel plate with an annular groove formed thereon is placed on the die with the base metal side down so that the annular groove and the die are concentric, and then the clad steel plate is pressed with a punch having rounded corners and the die. A method for punching a clad steel plate, characterized in that the punching is performed using a die. 2. In a clad steel plate punching method in which a clad steel plate consisting of a surface layer material and a base material is punched using a punch and a die, the die is a die with an annular projection formed on the inner diameter edge of the upper surface of the die, and the base metal side is facing down. The clad steel plate placed on the die was pressurized from the surface material side with a plate holder to form an annular groove in the base material, and then punched using a punch with rounded corners and the die. A method for punching a clad steel plate, characterized by: