Patent ID: 6725756
Filing Date: 2004-04-27
Classification: B21D,B23H,B23P,B26F,Y10T

Abstract:
A punch for use with metal material, said punch comprising;a carbide punch body; a unitary member for holding said punch body, said member including an aperture in which said punch body is located, said aperture including a central aperture axis oriented in the direction of the movement of said punch during a punching operation, said aperture including a bottom surface defining a supporting surface for supporting said punch body, said aperture including a peripheral surface, said peripheral surface having an innermost portion and an outermost portion further from said central aperture axis than said innermost portion, wherein said punch body forms a close fit with only said outermost portion of said peripheral surface at least one through-hole in said member, said through-hole smaller in cross sectional area than said aperture and having a longitudinal axis which is coaxial with said central aperture axis, said punch body secured in said member by a securing material selected from the group consisting of braising material, silver solder, adhesive epoxy, and welding material, said securing material contacting said innermost portion said peripheral surface and not contacting said outermost portion.