| 摘要 |
PROBLEM TO BE SOLVED: To improve the bending accuracy of a work by eliminating the punch fitting error. SOLUTION: A punch P is divided into upper and lower portions, and a punch lower portion P1 is movable in the back and forth direction against a punch upper portion P2, the punch lower portion P1 is brought into contact with a stopper 3 positioned at a preset punch position B, the punch lower portion P1 in contact therewith is locked to the punch upper portion P2, the work W is abutted on the stopper 3 positioned at the position corresponding to a predetermined flange dimension, and the bending is implemented in cooperation with the locked punch lower portion P1 with a die D.
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