| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of shrinkage to thereby reduce man-hours for finishing work performed in a succeeding stage by positioning with high accuracy when performing press forming. SOLUTION: A plurality of projection parts 30a-30d which are in close proximity to joined parts 22, 24, 26, 28 between a 1st to a 3rd meta plates 12, 14, 16 and have a locking side 32 approximately parallel to a joined line are provided on an assembled blank material 10. After performing positioning by abutting each projection part 30a-30d on a 9th to 12th positioning members 50a-50d provided on a lower die 40, the press forming is performed to the assembled blank material 10.
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