Abstract
The tool life in turning of sintered steels becomes shorter than that in turning of melted steels such as carbon steels. In order to clarify an effective tool material for the cutting of hardened sintered steel, the tool wear, the surface roughness and the cutting forces were experimentally investigated. The hardened sintered steel was turned with three kinds of PVD coated cemented carbide tools and four kinds of CBN tools. The main results obtained are as follows: (1) In the PVD coated cemented carbide tools, the wear progress of Ti(C, N) coated cemented carbide tool was slowest. (2) In the cutting of hardened sintered steel with the Ti(C, N) coated cemented carbide tool, both the surface roughness and the cutting forces were almost constant under the cutting speed 0.14m/s to 1.67m/s. (3) In the CBN tools, the wear progress of CBN tool which has Co based binder was slowest. (4) The mirror finish was clarified to be possible in the low speed cutting of hardened sintered steel with the CBN tool which has Co based binder.
