Patent ID: 6152005
Filing Date: 2000-11-28
Classification: B21D,Y10T

Abstract:
A punch assembly, comprising:a punch guide to be vertically removably supported in a punch holder, the punch guide being formed with a fitting hole at a lower end of the punch guide;a punch body being vertically movably supported in the punch guide, the punch body including a punching portion at a lower end of the punch body; anda blank holder further including:a cylindrical projecting portion to be inserted into the fitting hole of the punch guide in such a manner that an outer peripheral portion of the cylindrical projecting portion directly contacts with an inner peripheral portion of the fitting hole;a bottom portion located at a lower end of the blank holder; anda flange located at an outer peripheral portion of the bottom portion so as to surround the bottom portion,wherein the bottom portion of the blank holder has a thickness thinner than that of the flange;wherein the bottom portion of the blank holder is punch out by the punching portion of the punch body after the blank holder is mounted in the punch guide so that the cylindrical projecting portion is inserted into the fitting hole of the punch guide;wherein the bottom portion of the blank holder is located below a bottom end surface of the punch guide; andwherein the punch guide is partially formed with an inclined plane at an outer peripheral face on the lower end of the punch guide.