Abstract
The tool life in turning of sintered steel is shorter than that of carbon steel. In order to determine an effective coating film for cutting sintered steel with a coated cemented carbide tool, the tool wear was experimentally investigated. Sintered steel was turned with physical vapor deposition (PVD) coated cemented carbide tools. The coating films used were (Ti, Al)N coating film and titanium-tungsten based coating films, namely (Ti, W)N, (Ti, W)C and (Ti, W)(C, N) coating film. (Ti, W)N, (Ti, W)C or (Ti, W)(C, N) is a new type of coating film. The following results were obtained: (1) The critical load of titanium-tungsten based coating films was higher than that of the (Ti, Al)N coating film. (2) The hardness of the (Ti, W)C coating film was similar to that of the (Ti, Al)N coating film. (3) In cutting sintered steel, the wear progress of the (Ti, W)N coated tool was similar to that of the (Ti, Al)N coated tool. (4) In cutting sintered stainless steel, the wear progress of the (Ti, W)N coated tool was slightly faster that of the (Ti, Al)N coated tool.
