关键词: 高速切削；锯齿切屑；Johnson-Cook本构；有限元仿真

Abstract:

The flow stress behavior of aeronautical Ti6Al4V at the high temperature and high strain-rate was investigated by means of split Hopkinson pressure bar(SHPB) test system,and the Johnson-Cook model which is suitable for description of constitutive model in simulation of HSC was developed combined with quasi-static experimental data of Ti6Al4V alloy.Based on the finite element analysis, the forming process of serrated chip in high speed cutting of Ti6Al4V alloy was obtained and the variation of cutting
force,cutting temperature,equivalent plastic strain was analyzed,and the mechanism of serrated chip formation was also discussed.The calculated cutting forces and the temperatures are well agreed with the experimental data.

Key words: high speed cutting;serrated chip;Johnson-Cook constitutive, FEA