Patent ID: 6267684
Filing Date: 2001-07-31
Classification: B21K,Y10T

Abstract:
A method of producing a fluid sealing, solid metal rivet comprising:providing an extrusion die, said extrusion die havinga head portion defining a head cylindrical opening with a head diameter,a tapered portion defining a tapered opening extending from the head cylindrical opening, said tapered opening having a polished conical surface, anda shank portion defining a shank cylindrical opening extending from the tapered opening, said shank cylindrical opening having a polished shank cylindrical surface;providing a metal slug havinga slug cylindrical surface,a uniform slug diameter approximately equal to the head diameter, anda grain oriented substantially longitudinally along the axis of the metal slug;preprocessing the slug cylindrical surface to provide a surface that is substantially free of longitudinal surface defects;extruding the metal slug through the extrusion die from the head portion toward the shank portion to form a solid metal rivet having a head with the head diameter and a shank with a shank diameter connected by a tapered region;said solid metal rivet being characterized by the surfaces of the shank and the tapered region being suitable for making a fluid tight assembly.