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US 2011/0094358 A1Published application
Punch for punching sheet metal, sheet metal punching apparatus having the punch, and method therefor
OwnerTeruo Aramizu, Masatoshi Oishiinventors
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; a lower die 9 on which sheet metal 8 to be subjected to punching is placed; and a die 10 embedded in the lower die 9.
Claims8
A punch for punching sheet metal comprising:
- a punch body formed in the shape of a cylinder and a projection provided integrally on one end face of said body, wherein said projection includes a cylindrical portion provided integrally on the one end face of said punch body and having a bottom plane and a top plane, and a conical or pyramidal portion provided integrally on the top plane of said cylindrical portion, and said punch body includes a cylindrical surface extending in parallel to an axis, an annular surface surrounding the bottom plane of said cylindrical portion and extending perpendicularly to the axis, and a curved surface extending from an annular outer edge of the annular surface to an annular edge of the cylindrical surface.
A punch for punching sheet metal comprising:
- a punch body formed in the shape of a circular cylinder and a projection provided integrally on one circular end face of said punch body, wherein said projection includes a circularly cylindrical portion provided integrally on the one circular end face of said punch body and having a circular bottom plane and a circular top plane concentrically with that circular end face, and a conical portion provided integrally on the circular top plane of said circularly cylindrical portion, and said punch body includes a circularly cylindrical surface extending in parallel to an axis, a circularly annular surface surrounding the circular bottom plane of said circularly cylindrical portion and extending perpendicularly to the axis, and a curved surface extending from a circularly annular outer edge of the circularly annular surface to a circularly annular edge of the circularly cylindrical surface.
Dependencies are inferred from the claim text.