Patent ID: 6108890
Filing Date: 2000-08-29
Classification: B21J,Y10T

Abstract:
A method of removing a punch rivet (4, 14, 23), which is set into a workpiece (12, 13) and has a male die end (15) for driving the punch rivet (7, 14) and an opposite female die end (16) which penetrates into the workpiece (12, 13), characterized in that a pin (18) is placed with its front end (19) onto the male die end (15) so as substantially to cover the latter and, with a simultaneous supply of energy through the pin (18), heats the contact area between the pin (18) and male die (15) up to a fusion temperature in the contact area, cooling the contact area, applying pressure to the workpiece (12, 13) by an abutment (22) supported on the workpiece (12, 13), retracting the pin (18) and the punch rivet (4, 14, 23) fused therewith from the workpiece (12, 13) counter to the applying of pressure to the workpiece (12, 13), whereby the punch rivet (4, 14, 23) is withdrawn from the workpiece (12, 13).