METHOD FOR PRODUCTION OF RIVETS Russian patent published in 1994 - IPC

FIELD: high quality rivet joints. SUBSTANCE: billet of measured length is fixed at one end in the stamping tooling. The rivet set head is formed by axial plastic compression of the free end of the billet. The rivet produced is placed in the stamping tooling, with the set head located over the counter die hole. The axial rivet head projection is formed by applying axial force to the rod butt and extruding the rivet material into the counter die hole. Then the rivet is placed in tooling, having two-stepped hole, from the side of the larger step. The rod in placed in the smaller step. Then the axial force is applied to the rod butt. The rivet material is extruded into the free volume of the larger step forming the stepped rod. EFFECT: improved quality of the rivet joints. 10 dwg