Sheet metal punching apparatus and method thereof
OwnerMasatoshi Oishi, Teruo Aramizuinventors
Life of this patent
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Abstract
A sheet metal punching apparatus 1 includes an upper die holder 2 which is raised and lowered by a hydraulic ram and the like; a pressing plate 3 secured to the upper die holder 2; a pressing pad 5 suspended from the upper die holder 2 through a resilient member 4; a punch holder 7 secured to the pressing pad 5 by means of a bolt 6 and the like and constructed as a punch unit; a lower die 9 on which a sheet metal 8 to be subjected to punching is placed; and a die 11 embedded in the lower die 9 and having a though hole 10 of an oval shape conforming to the shape of a through hole to be punched in the sheet metal 8.
Claims4
A sheet metal punching apparatus comprising:
- a die having a through hole of a configuration conforming to a configuration of a through hole to be formed in a sheet metal;
- and a punch means including a punch body means having an outer configuration dissimilar to a configuration of an outer edge of the through hole of said die and adapted to form a through hole in the sheet metal in cooperation with said die and a pierced hole forming means which is integrally provided on one end face of said punch body means facing the through hole of said die and is adapted to form a pierced hole in the sheet metal, wherein the pierced hole is formed in the sheet metal by said pierced hole forming means, and in a state in which the movement of the sheet metal is restricted by said pierced hole forming means inserted in the pierced hole, said punch body means is inserted into the through hole of said die, whereby the sheet metal is subjected to tensile fracture at the outer edge of the through hole of said die through cooperation between said die and said punch body means, to thereby form the through hole in the sheet metal.
Dependencies are inferred from the claim text.