| 摘要 |
PROBLEM TO BE SOLVED: To reduce a camber or undulation in bending for a metal member. SOLUTION: A work W is placed on a pair of dies 1 and a knock out die 3, and a punch 2 is caused to descend, whereby the work W is subjected to bending into a box-shape. In order to reduce a camber generated by an internal stress after the bending on a surface of the knock out die 3, widths of friction-reduced regions at side portions thereof in a direction parallel to a bending ridge line are made to be larger than a width of the friction-reduced region at a center portion thereof, with the result that a distribution of friction at the respective portions of the knock out die during processing is improved. COPYRIGHT: (C)2010,JPO&INPIT
|
