CN-121988980-A - Press-molded part and method for manufacturing press-molded part

Abstract

The invention provides a press-formed part and a method for manufacturing the press-formed part, which can manufacture TWB plate materials comprising arc-shaped top plate parts while preventing cracking. The press-formed member according to the present invention is a press-formed member having a コ -shaped cross section using a butt-welded plate material in which one or both of metal plates having different plate thicknesses and strength are butt-joined or lap-joined, and includes a top plate portion extending in an arc shape, a flange portion, and a bent portion connecting the top plate portion and the flange portion, wherein the overlapping amount of the metal plates in the top plate portion is equal to the overlapping amount of the metal plates in the flange portion, and the joined portion of the metal plates in the top plate portion is welded from the front and rear surfaces.

Inventors

• EKAWA TETSUJI
• SAITO TAKAYOSHI
• Mizukami Toshi
• Xin Li Ying Tai

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260508

Application Date

20251030

Priority Date

20241107

Claims (2)

1. 1. A press-formed member having a コ -shaped cross section using a butt-welded plate material obtained by butt-welding or lap-welding metal plates having different plate thicknesses and/or different strength, the press-formed member comprising: A top plate portion extending in an arc shape; flange part A bending portion connecting the top plate portion and the flange portion, an overlapping amount of the metal plates in the top plate portion being equal to an overlapping amount of the metal plates in the flange portion, The joint portion of the metal plate of the top plate portion is welded from the front surface to the back surface.
2. 2. A method for manufacturing a press-formed member having a コ -shaped cross section, the press-formed member including a top plate portion and a flange portion extending in an arc shape, the method comprising the steps of: The 1 st metal plate and the 2 nd metal plate which is different from one or both of the plate thickness and the strength of the 1 st metal plate are arranged in such a manner that at least a part of a part corresponding to an inner flange part located further inward than a part corresponding to the top plate part is overlapped, and a part corresponding to an outer flange part located further outward than the part corresponding to the top plate part is not overlapped; Welding and jointing the 1 st metal plate and the 2 nd metal plate at a position corresponding to the top plate part; shaping the flange portion by bending, and And welding the flange part of the 1 st metal plate and the flange part of the 2 nd metal plate.

Description

Press-molded part and method for manufacturing press-molded part Technical Field The present invention relates to a press-formed member and a method for manufacturing a press-formed member. Background Patent document 1 describes a butt-welded (Tailor Welded Blank, hereinafter referred to as TWB) sheet material obtained by butt-welding metal sheets having different sheet thicknesses and/or different strengths. Since a part formed by press working a TWB plate material to form a flange is liable to break at a welded portion, it is difficult to realize a structure that expands and contracts in a direction orthogonal to an extending direction of the welded portion as shown in the drawing described in patent document 1. Patent document 1 Japanese patent laid-open No. 2006-306211 Patent document 2 Japanese patent laid-open No. 2007-075881 Disclosure of Invention A construction method capable of having curvature at least at a curved ridge line of a welded portion is desired. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a press-formed member and a method for manufacturing a press-formed member, which can manufacture a TWB plate material including a circular arc-shaped top plate portion while preventing breakage. The press-formed member according to one aspect of the present invention is a press-formed member having a コ -shaped cross section using a butt-welded plate material in which one or both of metal plates having different plate thicknesses and strengths are butt-joined or lap-joined, and includes a top plate portion extending in an arc shape, a flange portion, and a bending portion connecting the top plate portion and the flange portion, wherein an overlapping amount of the metal plates in the top plate portion is equal to an overlapping amount of the metal plates in the flange portion, and a joining portion of the metal plates in the top plate portion is welded from a front surface and a rear surface. A method for manufacturing a press-formed member according to an aspect of the present invention is a method for manufacturing a press-formed member having a top plate portion and a flange portion extending in an arc shape, the cross section of which is コ -shaped, and includes the steps of disposing a1 st metal plate and a2 nd metal plate different from one or both of the plate thickness and the strength of the 1 st metal plate, at least partially overlapping a portion corresponding to an inner flange portion located further inward than a portion corresponding to the top plate portion in an arc shape, non-overlapping a portion corresponding to an outer flange portion located further outward than the portion corresponding to the top plate portion in an arc shape, welding and joining the 1 st metal plate and the 2 nd metal plate at a portion corresponding to the top plate portion, forming the flange portion by bending, and welding the flange portion of the 1 st metal plate and the flange portion of the 2 nd metal plate. Effects of the invention The present invention can provide a press-formed member and a method for manufacturing a press-formed member, which can manufacture a TWB plate material including a circular arc-shaped top plate portion while preventing cracking. Drawings Fig. 1 (a) is a perspective view illustrating a press-formed member according to embodiment 1, fig. 1 (b) is a schematic view illustrating butt welding, and fig. 1 (c) is a schematic view illustrating lap welding. Fig. 2 (a) is a cross-sectional view illustrating a press-formed part according to embodiment 1, a cross-section taken along line II-II of fig. 1 (a), and fig. 2 (b) is a diagram illustrating a bending stress distribution. Fig. 3 (a) is a flowchart illustrating a method for manufacturing a press-formed member according to embodiment 1, and fig. 3 (b) is a perspective view illustrating a state in which the 1 st metal plate and the 2 nd metal plate are arranged in the method for manufacturing a press-formed member according to embodiment 1. Fig. 4 (a) is a perspective view illustrating a state in which the 1 st metal plate and the 2 nd metal plate are welded and joined in the method for manufacturing a press-molded member according to the comparative example, and fig. 4 (b) is a perspective view illustrating a press-molded member in the method for manufacturing a press-molded member according to the comparative example. Fig. 5 (a) and 5 (b) are diagrams illustrating an application example of the press-formed member according to embodiment 1. Fig. 6 is a diagram illustrating an application example of a method for manufacturing a press-formed member according to embodiment 1. Detailed Description The specific configuration of the present embodiment will be described below with reference to the drawings. The following description shows preferred embodiments of the present invention, but the scope of the present invention is not limited to the following