| 摘要 |
PROBLEM TO BE SOLVED: To form a member which hardly generates a warp in a side wall part formed in a moving direction of a forming die and excellent in impact absorbing characteristic in draw-bending a metal plate. SOLUTION: A die comprises a lower die 1 having a recessed forming surface 2 and a plate holding surface 3 continuous thereto, an upper die 4 having a projecting forming surface 5 to form a metal plate W in cooperation with the recessed forming surface 2 by being lowered to the lower die 1 side, and a plate holding member 6 to press the metal plate W against the plate holding surface 3. The radius R of curvature of a shoulder part 7 from the recessed forming surface 2 to the plate holding surface 3 is R=1.5t to 3.5t, where (t) is the thickness of the metal plate W. In forming the metal plate W, the metal plate W is restricted by the plate holding member 6 and the plate holding surface 3 when S is between 0.98×ST to 0.99×ST where S is the forming stroke that the upper die 4 is lowered, and ST is the total forming stroke, and a remaining part of ST is formed in this condition.
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