JPH1085847A - Metallic panel press-forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a press formation with excellent accuracy by providing a rough surface on at least one of overlapped surfaces of each metallic plate thereby preventing the slip between the metallic plates at the time of the press formation in a metallic plate press-forming method by which plural metallic plates are overlapped and pressed altogether. SOLUTION: A rough surface 10 is formed through blasting on the overlapped surface 8a of an outer member 8 to be overlapped with an inner member 9 before press-forming the end plate of a tank. The rough surface 10 prevents the slip between the outer member 8 and an inner member 9 during the pressing. An air vent hole 11 is formed in the center of the inner member 9. The outer member 8 is overlapped with the inner member 9 and set on a die for pressing, and the pressing is performed. Since the coefficient of friction between the metallic members 8, 9 is increased by the effect of the rough surface 10 formed on the overlap surface 8a of the outer member 8, the metallic plates 8, 9 can be press-formed without slipping from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for press-forming a metal panel, and more particularly to a method for press-forming a metal panel in which a plurality of metal plates are overlapped and press-formed.

[0002]

2. Description of the Related Art FIG. 7 shows an example of a conventional tank 20. The tank 20 is configured by welding a dome-shaped end plate 22 to both sides of a cylindrical body 21. In such a tank 20, there is a tank 20 in which the body 21 and the end plate 22 are each formed by bonding two metal plate members together. For example, the outer member is formed of a thick steel plate to form a base material, and the inner member is formed of a thin stainless steel member to form a lining material.

[0003] The base material is also joined by spot welding or the like. On the other hand, the end plate 22 is formed by laminating a disc-shaped base material and a lining material, press-forming them, and then joining and finishing them.

[0004]

However, if the base material and the lining material are press-formed together in the state where the base material and the lining material are superimposed during the press-forming of the end plate 22, oil adhering to the superposed surface of each metal plate material, both metal There is a possibility that slippage may occur between the overlapping surfaces of the two metal plate members due to the action of air or the like remaining between the plate members. In addition, the surface of the metal plate material may be scratched by the slip, and in this case, a post-process for removing the scratch is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a metal panel press forming method capable of preventing a metal plate from slipping during press forming. is there.

[0006]

According to a first aspect of the present invention, there is provided a method for press forming a metal panel in which a plurality of metal plates are overlapped and press formed together. At least one superposed surface of the plate was provided with a rough surface for preventing slippage between the two metal plates during press forming.

According to a second aspect of the present invention, in the first aspect, the rough surface is formed by blasting. According to the first aspect of the present invention, when a plurality of metal plate members are superimposed and pressed together, a rough surface provided on at least one of the superposed surfaces of the respective metal plate members is provided between the two metal plate members. Slip is prevented. That is, by the action of oil adhering to the superposed surfaces of the metal plates, air remaining between the superposed metal plates, etc., the respective metal plates tend to slide between the superposed surfaces during press forming. Here, the rough surface provided on at least one of the superposed surfaces of the metal plate materials increases the friction coefficient between the two superposed metal plate materials. For this reason, slippage between the overlapping surfaces of both metal plate members is prevented.

According to the invention described in claim 2, according to claim 1
In addition to the effect of the invention described in the above, it is possible to easily form a rough surface having an appropriate and uniform surface roughness on the surface of the metal plate material by blasting, so that it is possible to effectively prevent slippage between the metal plate materials It is possible to easily form a rough surface that can be formed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 2 shows a cross section of the tank 1. The tank 1 is formed by welding dome-shaped end plates 3 to both sides of a cylindrical body 2 respectively.

The body 2 is formed by bonding an outer member 4 formed of a steel plate and an inner member 5 formed of a stainless steel by spot welding. here,
The outer member 4 constitutes a base material, and the inner member 5 constitutes a lining material.

As shown in FIGS. 2 and 3, the inner member 5
A plurality of annular ridges 6 formed so as to protrude toward the center axis side are provided at a predetermined distance. The outer member 4 and the inner member 5 are connected to each point 7 between the annular ridges 6.
a and spot welding at each point 7b at each end of the body 2. The annular protruding portion 6 absorbs a difference in the amount of expansion and contraction of the outer member 4 and the inner member 5 in the central axis direction due to a difference in the contraction rate between the steel material forming the outer member 4 and the stainless steel forming the inner member 5. It is for.

The head plate 3 as a tank panel is formed by press-forming an outer member 8 made of a steel plate and an inner member 9 made of a stainless steel material. Similarly to the trunk 2, the outer member 8 constitutes a base material, and the inner member 9 constitutes a lining material.

Next, a method of press-forming the end plate 3 will be described in detail. First, prior to press forming, as shown in FIGS. 1A and 1B, a rough surface 1a is blasted on the entire surface 8a of the outer member 8 to be overlapped with the inner member 9.
0 is formed. The rough surface 10 is for preventing the outer member 8 and the inner member 9 from slipping during press forming. A hole 11 for venting air is provided at the center of the inner member 9.
To form Then, as shown in FIG. 4, the outer member 8 and the inner member 9 are overlapped with each other, and
Set to 2 and 13 and press molded.

At this time, the overlapping surface 8a of the outer member 8
Since the coefficient of friction between the two metal plates 8 and 9 is increased by the action of the rough surface 10 formed on the metal plate, the two metal plates 8 and 9 are press-formed without slipping each other as shown in FIG.
At the time of press forming, the air between the two metal plates 8 and 9 is exhausted from the air vent holes 11 provided in the inner member 9. Therefore, the movement of the outer member 8 or the inner member 9 with respect to the dies 12 and 13 is also suppressed.

After the press-formed members 8 and 9 are joined by spot welding or the like, the peripheral end is finished by cutting or the like as shown in FIG. still,
The air vent hole 11 is closed.

According to the press molding method for a tank panel described in detail above, the following effects can be obtained. (A) A rough surface 10 for preventing slippage with the inner member 9 is provided in advance on a superposed surface 8a of the outer member 8 which is press-formed in a state of being superposed on the inner member 9. Therefore,
At the time of press molding, the two members 8 and 9 do not slide between the overlapping surfaces, and the members 8 and 9 do not move with respect to the dies 12 and 13. As a result, press molding can be performed with high accuracy, and the surface of the end plate 3 can be prevented from being damaged.

(B) Since the annular member 6 for absorbing the difference in the coefficient of thermal expansion between the outer member 4 and the inner member 5 is provided on the inner member 5, the center axis direction of the outer member 4 and the inner member 5 is provided. Is absorbed as deformation of each annular ridge portion 6.
Therefore, since there is no displacement between the outer member 4 and the inner member 5 at each end of the body 2, the welded portions between the members 4, 5 and the end plate 3 are maintained in a good state. As a result, the confidentiality of the tank 1 can be stably maintained for a long time.

(C) Since the air vent hole 11 is provided in the inner member 9, the air between the two members 8, 9 is exhausted during press molding. Therefore, both members 8, 9 after press molding
Can be prevented more reliably.

The present invention is not limited to the above embodiment, but may be configured as follows. (1) Rough surface 10 only on superposed surface 8a of outer member 8
Is provided, but the overlapping surface 9a of the inner member 9 (FIG. 1)
(Illustrated in (b)) or may be provided on the respective superimposed surfaces 8a and 9a of the members 8 and 9. Also in this case, it is possible to prevent slippage between the overlapping surfaces of the two members 8 and 9 during the press forming.

(2) The entire surface of the superposed surface 8a of the outer member 8 is the rough surface 10, but the limited range may be the rough surface 10 as long as the sliding of both members 8, 9 can be prevented. .

(3) Although the rough surface 10 is formed by blasting, it may be formed by a grinder or the like. (4) Although the description has been made on the end plate 3 which is press-formed into a dome shape which is a rotating body shape, it may be carried out on a tank panel formed into another non-rotating body shape.

(5) Although the present invention is applied to the end plate 3 formed by superimposing two metal plates and press-forming, it may be applied to a panel formed by superposing three or more metal plates and press-forming.

The technical ideas other than the claims which can be grasped from the embodiment will be described below together with their effects. (1) The method for press-forming a metal panel according to claim 1 or 2 is a method for press-forming a head plate for a tank. According to this configuration, it is possible to prevent the tank head plate 2 formed by press-forming a plurality of metal plates from being damaged during press-forming.

[0024]

As described above in detail, according to the first aspect of the present invention, it is possible to prevent slippage between metal plates during press forming, and to perform press forming with high accuracy. The metal plate material can be prevented from being damaged.

According to the second aspect of the present invention, the first aspect is provided.
In addition to the effects of the invention described in (1), scratches during press molding can be prevented with a simple operation.

[Brief description of the drawings]

1A is a front view of an inner member, and FIG. 1B is a side cross-sectional view of both members superposed.

FIG. 2 is a front sectional view of a tank.

FIG. 3 is a side sectional view of a tank.

FIG. 4 is a cross-sectional view of a head plate during press molding.

FIG. 5 is a sectional view of the head plate.

FIG. 6 is a sectional view of the head plate.

FIG. 7 is a perspective view of a conventional tank.

[Explanation of symbols]

2 ... End plate as tank panel, 8 ... Outer member as metal plate material, 8a ... Overlapping surface, 9 ... Inner member as metal plate material, 10 ... Rough surface.

Claims (2)

[Claims] 1. A press forming method for a metal panel in which a plurality of metal plates (8, 9) are superimposed and press-formed, wherein at least one of the superposed surfaces (8a) of the metal plates (8, 9) is provided. And a method for press-forming a metal panel provided with a rough surface (10) for preventing slippage between the two metal plates (8, 9) during press-forming. 2. The method according to claim 2, wherein the rough surface is formed by blasting.