Research on the machinability when dry turning hardened steel with ceramic tool
Chunjuan Tu1, Xuhong Guo2
1Suzhou Institute of Industrial Technology,Suzhou- Jiangsu,China
2School of Mechanical and Electric Engineering, Soochow University, Suzhou- Jiangsu, China
The experiments of dry turning hardened steel with ceramic tool (CC6050) were carried out. The cutting forces of ceramic tool with different cutting parameters were measured by Kistler cutting force acquisition system, the prediction model of the surface roughness was built by Particle Swarm Optimization (PSO), the wear morphology of the tool and chip characteristics were observed by scanning electron microscope (SEM), analyzed the wear zone of the tool by the EDAXPV990(EDS).Results indicated that the cutting depth was the dominant factor affecting the cutting force, next was feed speed, the minimum was cutting speed. The feed speed was the dominant factor affecting the surface roughness, next was cutting depth, the minimum was cutting speed. The crater wear was shown on the rake face and the evenly distributed strip shaped wear was shown on the flank of the CC6050 tool, the main wear mechanism was abrasive wear, diffusion wear, adhesive wear and oxidation wear. The shape of chip was saw-tooth, the rough slice layers with periodic flowwere shown on the upside of the chip andthe streaks were evenly distributed on the underside of the chip. The cutting speed and feed speed were larger, the serrated level of the chip was higher and the angle of shear was larger.