| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus and a method for punching sheet metal, by which apparatus and method through holes having special shapes except circles can be formed without using a punch having the outside shape symmetrical to that of the through hole, and can reduce a punching cost. SOLUTION: The apparatus 1 for punching the sheet metal is provided with an upper die holder 2 to be moved upward and downward by means of a hydraulic ram, etc., a pushing plate 3 fixed to the upper die holder 2, a pushing pad 5 hanged from the upper die holder 2 via an elastic member 4, a punch holder 7 which is fixed to the pushing pad 5 via bolts 6, etc. and is configured as a punch unit, a lower die 9 on which the sheet metal 8 to be punched is put, and a die 11 which is buried in the lower die 9 and has a through-hole 10 having an elongated circular hole shape cross section corresponding to the shape of the through-hole to be formed on the sheet metal 8. COPYRIGHT: (C)2009,JPO&INPIT
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