清洁切削高温合金涂层刀具切削性能及加工表面完整性

In the high-speed dry cutting processes of superalloy, there were some prominent problems, such as serious tool wear, poor machining surface quality and so on. The experiments of high-speed milling of superalloy GH2132 were carried out with cemented carbide coated tools based on clean cutting technology. The effect laws of dry cutting and various injection temperatures of liquid nitrogen on the cutting performance of the coated tools and the integrity of the machined surface were studied, and the feasibility of using clean cutting superalloy to improve the life of the coated tools and the machined surface quality was investigated. The research shows that the cutting forces by liquid nitrogen cryogenic cutting GH2132 increase with the decrease of the injection temperature. The cutting temperature of the cutting zone completely reaches a low temperature condition when the injection temperature is as -150～-190 ℃. With the decrease of liquid nitrogen injection temperature, the peeling areas of the coating are obviously reduced, and the adhesive wear and oxidative wear are reduced. A longer tool life may be obtained under the injection condition of -150 ℃. The lower machined surface roughness Sa may be obtained under the injection condition of -30~-150 ℃. With the decrease of injection temperature, the work hardening and residual tensile stress are increased and decreased, respectively. Compared with the dry cutting, liquid nitrogen cutting injection temperature at -150～-190 ℃ may significantly improve the coated tool life and machined surface quality.