| 摘要 |
PROBLEM TO BE SOLVED: To effectively suppress the plate expansion easily occurring in a vicinity of a round portion during the drawing without adversely affecting the product function. SOLUTION: A stepped portion 10 to be swollen in the pressing direction is formed on a scrap portion of a bottom wall 6 to be connected to a vertical wall 3b via a round portion 5, and the stepped portion 10 is preferably arranged close to the round portion 5 easy to cause the plate expansion and in an inclined manner toward the round portion 5. When a product to be drawn of this shape is drawn, a material in the stepped portion 10 is volume-shifted to the periphery during the drawing, and as a result, the plate expansion on the round portion 5 side is suppressed. The portion having the stepped portion 10 is later punched along a punching line L2 to be scrap while a non-punching portion 6a is remained as a flange. COPYRIGHT: (C)2006,JPO&NCIPI
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