Role of Additives in P/M Machining

摘要

Many P/M parts are machined before final assembly. The increasing use of dedicated lines, or cells, in which many sequential operations are conducted on an assembly means that the time required to machine a P/M component will need to be reduced if it is the bottleneck in the assembly process. This paper examines the effects of three free-machining additives: boron nitride, manganese sulfide and pre-alloyed, or resulfurized, sulfur, upon the machining response of an FC-0205 P/M steel in a turning operation. The effects of the additives on tool wear, cutting forces, chip form and surface finish are compared.