| 摘要 |
PROBLEM TO BE SOLVED: To provide a punching apparatus and a punching method for punching a material excellent in fatigue characteristics. SOLUTION: The punching apparatus 100 comprises a cylindrical punch 2, a pad 3 and a die 1 each having through-hole formed larger in diameter than the outer diameter of the punch 2, and a setting table 17 having a recessed part 51 for engaging and fixing the die 1 therein formed on the surface thereof. A metal plate 4 is held between the pad 3 and the die 1 and punched with the punch 2. The hole edge 9 of the die 1 is 0.05 to 0.30 mm higher per a die radius of 10 mm than the die peripheral end part 16, and the die 1 peripheral end part 16 is higher than the surface 15 of the setting table 17. COPYRIGHT: (C)2009,JPO&INPIT
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