Method of machining oil ring assemblies

摘要

The shoulder portion 3 of a spacer expander 2 for a compound oil ring assembly is machined by bringing a machining tool, which is formed to have desired corrugations 118, into pressured contact with a surface of the shoulder portion 3 and transferring the corrugations of the machining tool to the surface of the shoulder portion. The machining tool may comprise machining rollers 111, 113.