Tool Life Prediction and Cutting Parameter Optimization for Coated Carbide in Ti6Al4V Turning

Ti6Al4V is a difficult to machine alloy with low cutting efficiency and server tool wear. A series of orthogonal turning tests with coated carbide in higher speed scale was carried out on a CA6140 lathe. The experiential functions of tool life based on orthogonal experiment were developed. The tool wear morphologies were examined by scanning electron microscope (SEM) and energy disperse spectroscopy (EDS), adhesion, diffusion and micro-chipping were the major wear mechanisms of coated carbide tool. Finally, the cutting parameters of coated carbide tool in Ti6Al4V dry turning were optimized based on tool life-efficiency contour analysis, in same cutting efficiency, the lower cutting speed and larger depth of cut are the better selection in Ti6Al4V turning for coated carbide tool.