To manufacture a metal-made member having a closed cross section without providing a flange part and also to form a bead part integrally with the metal-made member having the closed cross section.
A planar workpiece W1 made of metal is press-formed into a projected shape and also a projecting part W2a which is projected in an opposite direction is formed on a projecting top surface part W2, and by press-forming, with the use of a core die 65, the projecting part W2a in a direction in which the planar workpiece W1 is projected into a projected shape, the projecting part W2a is collapsed and a press-formed surface is formed and also the projecting side face parts W3, W4 are made into a closed cross section by displacing them to the inward sides, so that the member having the closed cross section is manufactured from the planar workpiece W1, At that time, the bead part is formed on the member having the closed cross section by press-forming the projecting part W2a using the core die 65.
ISHIDA YASUAKI
SAITO NAOKO
MURASE KENJI
NISHIGUCHI KATSUYA
Mitsuo Tanaka
Fukuoka Masaaki
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