Patent ID: 9079276
Filing Date: 2015-07-14
Classification: B23P

Abstract:
1. A method for making piston rings, comprising: preparing a packet of a plurality of piston ring bodies, each piston ring body presenting a peripheral surface extending axially between two edge regions, wherein each of the plurality of piston ring bodies of the packet are arranged such that at least one edge region is directly abutting an edge region of another piston ring body of the plurality of piston ring bodies; electro-plating a wear-resistant chrome layer of uniform thickness on to the cylindrical contour of the packet; and further profile grinding the electro-plated wear-resistant chrome layer on the packet of piston ring bodies together to provide a profiled running surface on each of the plurality of piston ring bodies, wherein the profiled running surface has a thickness, and the thickness decreases from a maximum thickness located at one of the edge regions to a minimum thickness located at the other edge region.