| 摘要 |
PROBLEM TO BE SOLVED: To make the increase of the force of constraint possible by beads without accompanying the increase of peeling of the surface plating. SOLUTION: In the holding state where a sheet blank W is held with wrinkle suppressing surfaces 11A-12B arranged on the surroundings of product forming surfaces of an upper die 11 and a lower die 12 and the sheet blank W is alternately bent and deformed by bringing a plurality of projecting corner parts 2-5 of beads 1 formed on the wrinkle suppressing surfaces 11A-12B into contact with the sheet blank W from the vertical directions, the sheet blank W is press-formed by the product forming surfaces of the upper die 11 and the lower die 12. That is, the plurality of the projecting corner parts 2-5 are provided with four projecting corner parts 2-5 from the outside of the wrinkle suppressing parts toward the inside, the first and the third projecting corner parts 2, 4 are arranged on the upper die 11 and the second and the forth projecting corner parts 3, 5 are arranged on the lower die 12. COPYRIGHT: (C)2007,JPO&INPIT
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