Abstract
The cutting performance of CBN tools-CBN-rich type and ordinary one-for high-speed end milling of hardened steel is investigated. The availability of TiAlN-coated carbide tools in low-speed hardmilling is also examined. In dry cutting of hardened carbon steel with the ordinary CBN tool, the cutting tool temperature θ_α rises rapidly with the increase of cutting speed v, and θ_α reaches approximately 850℃ at v=600m/min. In the case of the CBN-rich tool, the cutting temperature decreases by 50℃ or more because of high thermal conductivity. The hardness of workpiece has great influence on the cutting temperature. The TiAlN-coated carbide tool is sufficiently applicable to low-speed hardmilling.
