It possesses the punch null brim section of the press gold model which does the drill of the large-sized part

摘要

PROBLEM TO BE SOLVED: To provide a punch for a press die capable of forming a large number of holes despite narrow spacing between adjacent holes in single punching, and forming a large number of holes in various arrangements other than a straight arrangement.;SOLUTION: In a punch 1 for a press die having, on a head portion, a flange part 4 with an upper face formed in a substantially circular shape, two or more cut faces 5 are formed by cutting part of the outer circumferential surface of the flange part 4, wherein the cut faces 5 are formed so that the adjacent cut faces 5 and 5 have a predetermined angle.;COPYRIGHT: (C)2005,JPO&NCIPI