JP2741827B2 - Collective blank members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collective blank member formed by welding plate materials having different thicknesses to each other and thereafter press-molding the plate material into a desired shape.

[0002]

2. Description of the Related Art For example, when molding a side panel or the like which is a component of an automobile body, a plurality of plate members having different plate thicknesses are butted together, and the butted edges are welded to obtain a flat plate material. This flat plate is press-formed in accordance with a desired component shape (Japanese Patent Publication No. Sho 4).
No. 4-24763).

By the way, in this type of press molding,
The edges of the welded portions of the sheet materials having different plate thicknesses are stretch-flange-formed, and cracks or the like may occur at the press-formed edges due to stress concentration at the edges of the welded portions. For this reason, as disclosed in Japanese Utility Model Application Laid-Open No. 3-24371, the joint end portion of each steel plate is formed into a projecting piece in advance, and after welding, the projecting piece is cut out to form a removed portion. It is known that the concentration of stress during press molding is reduced (hereinafter, referred to as a first conventional example).

Further, from the viewpoint of removing unnecessary portions at the time of trimming after press forming, notches are formed in unnecessary portions provided in advance corresponding to both sides of the edge portion of the welding portion, so that the welding portion end is formed. It is known that stress concentration is prevented from occurring at the edge (hereinafter, referred to as a second conventional example).

[0005]

However, in the first conventional example, it is pointed out that the work of cutting off the protruding pieces after welding is required, which increases the number of steps and lowers productivity.

Further, in the second conventional example, unnecessary portions are increased and the yield of the plate material is reduced, and it is difficult to set the position of the notch when welding plate materials having different thicknesses. The problem has arisen.

SUMMARY OF THE INVENTION The present invention solves this kind of problem, and is an assembly capable of joining plate materials having different thicknesses and reliably preventing stress concentration from occurring at the joint end. An object is to provide a blank member.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a collective blank member which is formed by welding sheet materials having different thicknesses to each other, and is subsequently formed by pressing. The first plate on the side of the sheet and the second plate on the side of the sheet are mutually
One surface of the stomach is welded by arranging on the same plane, before
Serial on the other surface of the first plate member, while being configured gradually thin plate toward the welded part edge of said second plate member,
An inclined portion for setting the edge of the welding portion of the first plate to the same thickness as the edge of the welding portion of the second plate is provided.

[0009]

In the collective blank member according to the present invention, after the first plate material and the second plate material having different plate thicknesses are butt-welded, the first plate material on the thick plate side is subjected to polishing or the like. Therefore, the first plate is provided with an inclined portion gradually formed in a thin plate shape toward the edge of the welding portion with the second plate on the thin plate side. Therefore, since the edge of the welded portion of the first plate and the edge of the welded portion of the second plate are set to the same thickness, the thickness of the plate between the first plate and the second plate is sharp. no change. As a result, it is possible to reliably prevent the stress from being partially concentrated when performing the press forming operation on the collective blank member.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a collective blank member according to the present invention.

In FIG. 1, reference numeral 10 indicates a collective blank member according to the present embodiment. The collective blank member 10 constitutes, for example, a side panel, which is a component of an automobile body, and has plate members having different plate thicknesses, that is, a front pillar portion (first plate member) 12 and a center pillar portion (first plate member) 12 on the thick plate side. The first plate 14) and the side sill portion (second plate) 16 on the thin plate side are butt-welded to each other. The front pillar portion 12 and the side sill portion 1
Welds 18 and 22 are provided at the butting edges of the center pillar 6 and the center pillar 14 and the side sill 16 respectively.

The collective blank member 10 is later formed into a shape corresponding to the side panel by press forming. At this time, the welded portion edge 20 of the front pillar portion 12 where stress concentration is likely to occur is formed. Center pillar part 1
4 is gradually formed in a thin plate shape toward the welding edge portions 24, 26, and the welding edge portions 20, 24, 26 are connected to the welding edge portions 20 of the side sill portion 16.
a, 24a, and 26a are provided with inclined portions 28, 30, and 32 having the same plate thickness.

As shown in FIG. 2 and FIG.
0 is provided on the inner surface side of the center pillar portion 14, and is formed in a relatively wide area along the end curved portion 34 of the center pillar portion 14. In addition, the inclined parts 28 and 32
The configuration is the same as that of the above-described inclined portion 30, and a detailed description thereof is omitted.

Next, an operation of manufacturing the collective blank member 10 configured as described above will be described.

First, a front pillar portion 12 and a center pillar portion 14 on the thick plate side, a side sill portion 16 on the thin plate side and the like are prepared, and ends of the front pillar portion 12 and the center pillar portion 14 and the side sill portion 16 are provided. Are butted against each other. The front pillar portion 12 and the center pillar portion 14 are operated under the action of a welding machine (not shown).
Are welded to the edge of the end of the side sill portion 16 to provide welding portions 18 and 22.

Next, the inner surfaces of the front pillar portion 12 and the center pillar portion 14 are polished so as to be gradually thinned toward the respective welding portion edges 20, 24 and 26, and the welding portions are formed. The edge portions 20, 24 and 26 are welded to the side sill portion 16 at the welding portion edge portion 20a,
Inclined part 2 set to the same thickness as 24a and 26a
8, 30, and 32 are formed.

Therefore, the collective blank member 10 configured as described above is formed into a shape corresponding to a desired side panel by a press forming machine (not shown). in this case,
The collective blank member 10 includes the front pillar 1 on the thick plate side.
Since the second and center pillar portions 14 and the side sill portions 16 on the thin plate side are butt-welded, stress concentrations are generated at the welded edge portions 20, 24, and 26, and cracks are likely to occur.

However, in the present embodiment, the front pillar portion 12 and the center pillar portion 14 are formed in a thin plate shape gradually toward the welding portion edge portions 20, 24 and 26, and the welding portion edge portions 20, 24 and 26 are welded to the edges 20a, 24a and 2
Inclined portions 28, 30 and 32 having the same plate thickness as 6a are formed. Therefore, a sharp change in the sheet thickness is not caused at the welded portions 18 and 22 as shown by the two-dot chain line in FIG. 3, and the stress is particularly applied to the welded edge portions 20, 24 and 26 which are curved. It is possible to reliably prevent concentration from occurring. Thereby, there is obtained an effect that a crack and the like are not generated at the time of press forming, and a highly accurate and efficient press forming operation is performed.

[0019]

According to the collective blank member of the present invention, the following effects and advantages can be obtained.

After the first plate material and the second plate material having different plate thicknesses are welded to each other, the first plate material on the thick plate side is polished or the like, and the second plate material on the thin plate side is added to the first plate material. And the edge of the welded portion of the first plate is set to the same thickness as the edge of the welded portion of the second plate. An inclined portion is provided. Therefore, in this collective blank member,
There is no sharp change in the plate thickness at the edge of the welding portion, and it is possible to reliably prevent stress concentration from occurring during press forming.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a collective blank member according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the collective blank member.

FIG. 3 is a sectional view taken along line III-III in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Collective blank member 12 ... Front pillar part 14 ... Center pillar part 16 ... Side sill part 18 ... Welded part 20, 20a ... Welded part edge 22 ... Welded part 24, 24a, 26, 26a ... Welded part edge 28 , 30, 32 ... inclined part 34 ... end curved part

Claims (1)

(57) [Claims] 1. A collective blank member which is formed by welding plate materials having different plate thicknesses to each other and which is subsequently pressed and formed, wherein a first plate material on a thick plate side and a second plate material on a thin plate side are mutually bonded. on the other hand
The surface is welded by arranging on the same plane, wherein the other surface of the first plate member, while being configured gradually thin plate toward the welded part edge of said second plate member And an inclined portion for setting the edge of the welding portion of the first plate to the same thickness as the edge of the welding portion of the second plate.