Abstract: Based on AdvantEdge FEM software,the finite element numerical simulation model of 45 steel drilling process was established. A set of simulation data of torque,drilling force,drilling temperature and chip morphology when drilling 45 steel workpiece with standard twist drill was obtained through single factor simulation experiment. The effects of five parameters of 45 steel J-C constitutive model (yield strength,hardening modulus,strain rate sensitivity,thermal sensitivity and strain-hardening exponent) on the numerical simulation results of drilling process were studied. The results show that the influence of five parameters of J-C constitutive model on the numerical simulation results of drilling process of 45 steel has obvious regularity.The torque,drilling force and drilling temperature are greatly affected by yield strength,hardening modulus and thermal sensitivity. The variation of chip crimp radius is mainly affected by yield strength,thermal sensitivity and strain-hardening exponent,and has little relationship with parameters hardening modulus and strain rate sensitivity. The results have a certain reference value for adjusting and optimizing the parameters of workpiece material J-C constitutive model used for finite element numerical simulation of drilling process and obtaining accurate numerical simulation results of drilling process.

Key words: drilling process, finite element numerical simulation, J-C constitutive model parameters, simulation results, 45 steel