JPH08243770A - Joining method for metal plate - Google Patents

Abstract

PURPOSE: To facilitate easy and quick joining without unnecessarily raising the dimensional accuracy of each metal plate in forming a part in a shape in which plural plates are successively joined and bound one another as a whole. CONSTITUTION: In the case of forming a part in a shape in which plural plates 1-5 are successively joined and bound one another as a whole, for example, a side member A of an automobile; first, with one plate 5 put aside, the other plates 1-4 are each butt-welded w. Then, the remaining one plate 4 is superposed on the end of the other laser-welded plates and is spot-welded x. The spot welding is performed on a part where a drawing quantity by press working is small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining plate materials when forming parts using waste materials such as thin plates, and more particularly to a shape in which a plurality of plate materials are sequentially joined and restrained as a whole, for example, an annular shape. Involved in forming parts.

[0002]

2. Description of the Related Art Recently, the use of waste materials for automobile panel materials has been studied and partially implemented. In this case, as a welding method for joining the plate materials, butt welding by laser welding that irradiates a laser beam is generally used. This is for the following reasons. In other words, in arc welding, the heat effect at the welding point is large and the welding range is wide, so sufficient ductility cannot be obtained when press working is performed after welding. Further, in spot welding, since welding points are intermittent, stress concentration is likely to occur when press working is performed after welding, and cracks or the like may occur. On the other hand, laser welding does not have such a problem and is suitable for press working after welding. Incidentally, Japanese Patent Laid-Open No. 91988/1988 discloses that
A method of joining parts by using spot welding and beam welding together is disclosed.

[0003]

However, in the case of butt welding by laser welding, the end faces of the plate materials must be welded in a state of being in contact with each other, and the distance between them is 0.05 mm.
If the above gap exists, welding will not be possible. Therefore, in particular, in the case of forming a shape in which a plurality of plate materials are sequentially joined and restrained as a whole, for example, when forming an annular component such as an automobile side member, it is necessary to increase the dimensional accuracy of each plate material,
The reality is that the implementation has not been achieved.

The present invention has been made in view of the above points, and an object of the present invention is to form a part having a shape in which a plurality of plate materials are sequentially joined to each other and are restrained as a whole.
Using butt welding with laser welding together with other welding,
An object of the present invention is to provide a joining method suitable for performing press working after joining without increasing dimensional accuracy of each plate material more than necessary.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 is a method for joining plate materials, in which a plurality of plate materials are sequentially joined to form a part having a shape of restraining each other as a whole. The other plate members are butt-welded by laser welding while leaving one plate member, and then the remaining one plate member is overlapped and welded on the end of the laser-welded plate member.

According to a second aspect of the present invention, in the method for joining plate members according to the first aspect, the parts having a shape to be restrained as a whole are formed by chaining a plurality of plate members in an annular shape. The component formed by linking in a ring shape is a side member of an automobile as in the invention according to claim 4, for example.

According to a third aspect of the present invention, in the method for joining plate materials according to the second aspect, a portion where the remaining one member and the end portion of the laser-welded plate material are overlap-welded and the drawing amount is small in press working The configuration will be performed in.

[0008]

With the above construction, in the invention according to claim 1, when one plate member is left and the other plate members are butt-welded by laser welding, they are still formed into parts having a shape that is restrained as a whole. Therefore, it suffices to simply weld the end faces of the plate members in a state where they are in contact with each other, and it is not necessary to increase the dimensional accuracy of each plate member more than necessary. After that, the remaining one plate member is overlapped with the end portion of the laser-welded plate member and welded to form a part having a shape of restraining each other as a whole.

According to the third aspect of the present invention, the lap welding of the remaining one member and the end of the laser-welded plate is performed.
Since the work is done in a place where the drawing amount is small in press processing,
The stress concentration at the spot welding point due to press working is small, and cracks etc. do not occur.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment in which the plate material joining method of the present invention is applied to the case of forming a side member A of an automobile (specifically, its material).

The side member A is a front pillar,
The inner parts of the roof side, the side sill, and the center pillar are formed integrally and annularly. In creating the side member A, first,
The five plate members 1 to 5 that form the side member A are prepared by cutting flat thin plate waste materials into predetermined shapes.
That is, a plate material (hereinafter, referred to as a hinge pillar plate material) 1 that constitutes a part corresponding to a lower portion (hinge pillar) of the front pillar, and a plate material (hereinafter, referred to as a front pillar plate material) 2 that constitutes a portion corresponding to an upper part of the front pillar, A plate member (hereinafter referred to as a roof side plate member) 3 that constitutes a portion corresponding to the roof side, and a member (hereinafter referred to as a side sill plate member) 4 that constitutes a portion corresponding to a side sill,
A plate material (hereinafter referred to as a center pillar plate material) 5 that constitutes a portion corresponding to the center pillar is prepared.

Then, of the above five plate members 1 to 5, the other four plate members 1 to 4 except the center pillar plate member 5 are butt-welded by laser welding by contacting the end faces of adjacent plate members. . That is, the upper end surface of the hinge pillar plate material 1 and the lower end surface of the front pillar plate material 2, the upper rear end surface of the front pillar plate material 2 and the front end surface of the roof side plate material 3, the lower end surface of the hinge pillar plate material 1 and the front of the side sill plate material 4. Butt weld the upper end of each part. At that time, since the four plate members 1 to 4 are not yet formed into a shape in which they are chained in an annular shape and restrain each other as a whole, in the butt welding w of these plate members 1 to 4, the end faces of the plate members are simply It suffices to weld the plates in contact with each other, and it is not necessary to make the dimensional accuracy of each plate material higher than necessary.

Subsequently, the upper end of the center pillar plate material 5 which is the remaining one plate material is superposed on the lower edge portion of the roof side plate material 3 which is laser welded, and the lower end thereof is superposed on the upper edge portion of the side sill plate material 4 which is also laser welded. Spot welding x is performed to form a side member A formed by connecting five plate members 1 to 5 in an annular shape. In this lap welding, the dimensional accuracy at the welding point does not need to be higher than in the case of the butt welding w, and even if there is some dimensional error, the joining of the plate materials can be facilitated, and the predetermined joining is possible. The strength can be secured.

Thereafter, the side member A is subjected to press working, a predetermined drawing is performed, and a hole or the like is provided, whereby a product A'as shown in FIGS. 2 to 7 is completed. Here, the butt welding w has a large reduction amount in the press work (see FIGS. 3 to 5), whereas the lap welding has performed (that is, the upper and lower end joints of the center pillar plate member 5). In, the reduction amount of press working is small (see FIGS. 6 and 7).

As described above, in the joining method of the above-described embodiment, the plate members 1 to 5 constituting the side member A are joined to each other in order without increasing the dimensional accuracy of the plate members 1 to 5 more than necessary. The member A can be easily and surely formed, and the efficiency of the joining work can be improved. Moreover, since the amount of reduction in press working is small at the spot where lap welding is performed, it is possible to minimize the stress concentration at the spot welding x spot associated with this press working, and prevent the occurrence of cracks and the like. can do.

The present invention is not limited to the above embodiment, but includes various other modifications.
For example, in the above-described embodiment, spot welding x is used when performing lap welding on the lower edge portion of the roof side plate material 3 and the upper edge portion of the side sill plate material 4, which are laser welded upper and lower ends of the center pillar plate material 5, respectively. However, in the present invention, seam welding may be used instead of the spot welding x.

Further, although the present invention is applied to the case where the side member A of the automobile is formed in the above embodiment, the present invention is not limited to this side member A, and a plurality of plate members such as a roof panel and a back door of an automobile having a sunroof. It can be widely applied to the case where the parts are sequentially joined to form a part having a shape in which the parts are restrained as a whole.

[0019]

As described above, according to the plate material joining method of the present invention, when a plurality of plate materials are sequentially joined to form a part having a shape in which they are restrained as a whole, one plate material is left and the other is left. After butt-welding each plate material by laser welding, the remaining one plate material is overlapped and welded to the end of the laser-welded plate material, so that it is not necessary to increase the dimensional accuracy of each plate material more than necessary, The joining work can be performed easily and quickly, and the work efficiency can be improved.

In particular, according to the third aspect of the present invention, the lap welding of the remaining one member and the end of the laser-welded plate material is carried out at a place where the drawing amount is small in the press working, thereby performing the press working. Therefore, the stress concentration at the spot welding point due to the above can be reduced as much as possible, and it is possible to prevent the occurrence of cracks.

[Brief description of drawings]

FIG. 1 is a plan view of a side member before pressing, which is formed using a joining method of the present invention.

FIG. 2 is a plan view of the side member similarly after press working.

FIG. 3 is an enlarged cross-sectional view taken along the line BB of FIG.

FIG. 4 is an enlarged cross-sectional view taken along the line CC of FIG.

5 is an enlarged cross-sectional view taken along the line DD of FIG.

FIG. 6 is an enlarged cross-sectional view taken along the line EE of FIG.

FIG. 7 is an enlarged cross-sectional view taken along the line FF of FIG.

[Explanation of symbols]

 A Side member (part) 1 to 5 Plate material w Butt welding x Spot welding

Claims (4)

[Claims] 1. A method for joining plate materials, wherein a plurality of plate materials are sequentially joined to form a part having a shape in which they are restrained as a whole. First, one plate material is left and the other plate materials are butt-welded by laser welding. Then, the remaining one plate member is superposed on the end portion of the laser-welded plate member and welded, and the plate member joining method. 2. The plate material joining method according to claim 1, wherein the parts having a shape to be restrained as a whole are formed by connecting a plurality of plate materials in an annular shape. 3. The method for joining plate members according to claim 2, wherein the lap welding of the remaining one member and the end of the laser-welded plate member is performed at a portion where the reduction amount in the press working is small. 4. The method for joining plate members according to claim 2, wherein the component formed by linking a plurality of plate members in an annular shape is a side member of an automobile.