Patent ID: 6189361
Filing Date: 2001-02-20
Classification: B21C,B21D,B21J

Abstract:
A protrusion forming tool device, comprising: a protrusion forming tool for cutting and protruding a portion of a surface of a workpiece so as to form a protrusion by means of cooperation of a punch and a die, wherein the punch includes:a cylindrical punch guide which is supported to a punch holder in a punch press movably up and down;a punch driver provided to an upper portion of the punch guide, wherein the punch driver having a punch head at its upper end is movable up and down and is pushed upwardly;an up/down slider, wherein an inclined surface is provided on a lower surface of the up/down slider and wherein the up/down slider is provided in a position below the punch driver in the punch guide movably up and down;an elastic member, wherein the elastic member is provided between the up/down slider and the punch driver;a workpiece retainer, wherein the workpiece retainer is provided at a lower portion of the punch guide; anda punch body, wherein the punch body is provided in a position below the up/down slider in the punch guide so as to be movable up and down and movable in a radial direction of the punch guide and wherein a lower portion of the punch body can be protruded to a downward direction from the workpiece retainer,wherein the punch body is provided with a cutting and protruding blade at a lower end of the punch body for cutting and protruding the protrusion on the surface of the workpiece; andwherein the punch body is provided with an inclined surface on an upper surface of the punch body, and the inclined surface comes into surface-contact with the inclined surface formed on the lower surface of the up/down slider.