| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of hold wrinkles. SOLUTION: Edge parts of portions corresponding to regions where the generation of the hold wrinkles is predicted are bent preliminarily partially (the formation of bent regions Wa) with the die 11 of the upper die and blank holders 13. After this, the end parts of the blank metal sheet W are held so as not to hold the bent regions Wa with the holding parts 11a of the die 11 of the upper die and the holding parts 13a of the blank holder 13. After that, the blank metal sheet W is press-formed with the die 11 of the upper die and the punch 12 of the lower die. COPYRIGHT: (C)2010,JPO&INPIT
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