JP3385079B2 - Manufacturing method of welded products - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a welded product which comprises press-molding a material obtained by joining a clad material and an ordinary plate material by welding.

[0002]

2. Description of the Related Art Conventionally, in press working, when a single plate is worked, an unnecessary portion to be cut off becomes large, resulting in poor yield and high cost. Therefore, in order to improve the yield in the forming by pressing, by combining a plurality of thin steel plates with a simple polygonal shape into the developed shape of the product to be obtained and joining each thin steel plate by welding, A manufacturing method of a pressed product in which a material is formed and this pressing material is pressed is known (see, for example, JP-A-59-220229), and is used for manufacturing a side frame outer or the like in an automobile body. ing.

[0003]

However, when the side frame outer of the vehicle body is manufactured by the conventional method for manufacturing a pressed product, it is necessary to dispose the reinforcement in the side sill. That is, FIG.
As shown in, press-molded side frame outer
The side sill outer 10A is formed at the lower end of 10, the side sill inner 12 is joined through the reinforcement 11 to form a closed cross section, and the end of the floor panel 13 is joined at the lower end. Reinforcement
11 is indispensable, and the side sill inner 12 and the reinforcement 11 and the side sill outer are located above the side sill.
It is necessary to join 2 places between 10A and 3 places between the floor panel 13, the side sill inner 12, and the reinforcement 11 and the side sill outer 10A in the lower part, and there are many welding points and the work is complicated. was there. Also, in order to reduce the weight of the vehicle body, the side frame outer is often made of aluminum material, but the floor panel is made of steel plate, which may cause electrolytic corrosion. Since the press formability is small, there is a problem that a portion having a large forming depth (for example, a lower end corner of the door opening) may be cracked.

An object of the present invention is to provide a method for producing a welded product which can improve the formability of a material having a low press workability, improve the weldability and increase the strength of the welded product. It is to be.

[0005]

In order to achieve the above object, the method of manufacturing a welded article according to the present invention is such that the clad material made of two kinds of materials having different press formability has the other press formability and strength. A panel material on the smaller side of the panel material and a panel material made of the same kind of material as the one material are welded in a flat plate state to form a forming material, and this forming material is deep-drawn with a clad material. Along with this, press molding is performed.
Further, in the method for manufacturing a welded product, the weldability of the other material of the clad material is made better than that of the one material,
It is possible to form a rigid portion by welding a panel material made of the same material as the other material to the other material side after press molding to form a closed cross section between the panel material and the other material. .

[0006]

[Function] The clad material is welded in a flat plate state with one material whose press formability and strength are smaller than those of the other material, and a panel material made of the same kind of material as the one material to form a molding material. By press forming the material with deeper drawing of the clad material, it is possible to prevent the panel material made of a material having a small press formability from breaking during the press forming and improve the press formability. In addition, a panel material made of the same material as the other material is welded to the other material side after press molding to form a closed section between the panel material and the other material to form a rigid portion. As a result, it is possible to reliably weld two panels made of two kinds of materials having different weldability, and improve the rigidity of the closed cross section without using reinforcement.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment in which the present invention is applied to manufacture of a side frame outer of a car body will be described with reference to the drawings. In FIG. 2, the clad material 1 is formed of one material 1a and the other material 1b made of two different materials, and the one material 1a has a smaller press formability, strength and weldability than the other material 1b. Has been adopted. For example, in this embodiment, one material 1a is a 5000 series aluminum material and the other material 1a.
Steel plate is used for b. One side 1a of the clad material 1
Of the same kind of material as the one-sided material 1a (in this embodiment, 5000
The end surface of the first panel member 2 made of a system aluminum material is joined by butt welding to form the forming material 3.

As shown in FIG. 3, the molding material 3 is combined with the developed shape of the side frame outer, which is the product to be obtained, and the openings 31, 32 which become the door openings after the press molding are formed.
However, it is opened across the clad material 1 and the first panel member 2. The molding material 3 is pressed (for example, 5
(Step) to form the side frame outer 30 as shown in FIG. In the side frame outer 30, the openings 31, 32 are enlarged and formed as shown by an arrow F to form door openings 310, 320, and a wheel house portion 330 is formed.

With the above-described structure, since the clad material 1 and the first panel member 2 are joined by welding and then pressed, the formability is improved. That is, since the clad material having the formability larger than that of the first panel member 2 is arranged in the portion where the forming depth is large, the lower corners 4 of the door openings 310 and 320 where the forming depth is large during press working. , 5 and 6,
In No. 7, there is no risk of cracking. The upper corners 8 and 9 of the door openings 310 and 320 have a molding depth smaller than that of the lower corners 4, 5 and 6, 7 and can be molded without cracking even the first panel member 2 having a low moldability.

As shown in FIG. 1, the side frame outer
A side sill outer 301 is press-formed at the lower end of 30, and in the side sill outer 301, one material 1a and the first panel member 2 are arranged on the outside of the vehicle body, and the other material 1b is arranged on the inside of the vehicle body. 1b, the upper flange 331 and the lower flange 332 of the side sill inner 33 formed of the same kind of material (steel plate in this embodiment) are joined to the other material 1b by welding to form a side sill closed cross section, and the side sill inner 33
The end flange 341 of the floor panel 34, which is also formed of the same material as the other material 1b (a steel plate in this embodiment), is joined to the lower flange 332 on the side opposite to the other material 1b.

According to this structure, the side sill outer 301
Is formed of a clad material, the one material 1a and the other material 1b are in close contact with each other, and the other material 1b functions as a reinforcement, so that the rigidity is improved and a separate reinforcement is provided. There is no need. Further, since the other material 1b is arranged outside the center of the side sill closed cross section, the rigidity of the side sill closed cross section is improved, and different materials are used for the side frame outer side, the floor panel and the side sill inner. In this case, the weldability is improved, power consumption is reduced particularly in the case of spot welding, and electrode wear is reduced.

[0012]

Since the present invention is constructed as described above, it has the following effects. A clad material is welded in a flat plate state with one material whose press formability and strength are smaller than those of the other material, and a panel material made of the same material as the other material to form a molding material, and the clad material is clad. By press forming with deep drawing of the material,
A panel material made of a material having low press moldability is prevented from breaking during press molding, and press moldability is improved. In addition, a panel material made of the same material as the other material is welded to the other material side after press molding to form a closed section between the panel material and the other material to form a rigid portion. As a result, it is possible to reliably weld two panels made of two kinds of materials having different weldability, and improve the rigidity of the closed cross section without using reinforcement.

[Brief description of drawings]

1 is a sectional view taken along the line AA in FIG. 4 showing an embodiment of the present invention.

FIG. 2 is a side view of a molding material that is an embodiment of the present invention.

FIG. 3 is a front view of a molding material that is an embodiment of the present invention.

FIG. 4 is a front view of a side frame outer which is an embodiment of the present invention.

FIG. 5 is a cross-sectional view of a conventional side sill structure.

[Explanation of symbols]

1 clad material, 1a one side material (5000 series aluminum material) 1b other side material (steel plate), 2 first panel member, 3 molding material 30 side frame outer, 33 side sill inner, 34
Floor panel 301 Side sill outer

Front page continuation (72) Inventor Katsuya Nishiguchi 3-1, Shinchi Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (72) Inventor Kohei Amano 3-1-1 Shinchu, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (56) References JP-A-2-182335 (JP, A) JP-A-5-220521 (JP, A) JP-A-5-154571 (JP, A) JP-A-59-223572 (JP, A) Kai 53-30972 (JP, A) JP 51-139566 (JP, A) JP 59-220229 (JP, A) Actual Kaihei 4-5182 (JP, U) (58) Fields investigated (58) Int.Cl. ⁷ , DB name) B21D 22/02 B21D 22/20 B21D 22/26-22/28 B21D 53/86-53/88

Claims (2)

(57) [Claims] 1. A panel material side one material in which the press formability and strength of a clad material made of two kinds of materials having different press formability are smaller than that of the other material, and a panel material made of the same kind of material as the one material. Weld in the flat plate state to form the forming material,
A method for producing a welded product, characterized in that the forming material is press-formed with deeper drawing of the clad material. 2. The method for manufacturing a welded article according to claim 1, wherein the weldability of the other material of the clad material is better than that of the one material, and the other material is provided on the other material side after press molding. And a panel material made of the same material as described above is welded to form a closed cross section between the panel material and the other material to form a rigid portion.