3D numerical simulation on thermal-stress distribution of hardened steels workpiece assembled with different hardness

Abstract

Thermal-stress distribution in the transitional domain of assembled hardened steel die with different hardness was investigated. Finite element analysis method was applied for assembled die in milling process. The milling force, milling temperature fluctuation amplitude and stress field, temperature field distribution in assembled transitional domain was obtained respectively. Based on the elastic-plastic mechanics and high speed cutting technology, milling force, milling temperature fluctuations of assembled workpiece with different material hardness were studied. Considering the change of Johnson–Cook constitutive model parameters, singularity distribution regularity of stress field, temperature field in the transitional domain was analyzed. The results showed that: the milling force, milling temperature in the assembled transitional domain presented a step change characteristic, the distribution of the thermal-stress field in the transitional domain had a significant difference due to the distinct material hardness and the experimental results were well consistent with the numerical simulation results further validated the accuracy of simulation.