| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a ring-like blanked product with high flatness by previously warping a material metal plate M<SB>0</SB>before blanking in the L-warpage which cancels the warpage expected to be generated to the blanked product by inside blanking and outside blanking. SOLUTION: When the ring-liked blanked product M<SB>2</SB>is manufactured in such a manner that the material metal plate M<SB>0</SB>placed on a die 1 is restrained by a stripper plate 2, punches 3, 5 are relatively moved in the die direction, and inside blanking and outside blanking are executed, the material metal plate M<SB>0</SB>to which the L-warpage with the curvature that cancels recessed type warpage generated to the blanked product M<SB>2</SB>is previously imparted is used. It is preferable to regulate the curvature of the L-warpage to 1.39×10<SP>-4</SP>/mm or less. COPYRIGHT: (C)2003,JPO
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