铣削三维物理仿真材料本构方程参数获取方法

Method to obtain material model parameters used in three dimensional-simulating milling process

针对目前金属切削过程的三维物理仿真精度低的问题,以Power Law模型为材料本构方程,提出一种将准静态压缩实验、霍普金森压杆实验和正交切削实验相结合,获取材料本构方程参数的方法.该方法利用正交切削实验消除压杆实验与实际切削过程的差异,使得所获取的材料本构方程参数能够准确地反映切削过程中的金属材料变形行为.应用该方法提取合金结构钢SCM440H的Power Law本构方程参数,将所获取的材料本构方程参数应用到该材料的端面铣削过程的三维有限元仿真,最后将铣削实验与仿真结果进行对比,表明了该本构方程的准确性,证明了所提出的材料本构方程参数获取方法的有效性.

The objective of this paper is to improve the accuracy of the material models for 3D simula- ting metal cutting process. A method for extracting the parameters in Power Law constitutive model was proposed. In this method, quasi-static pressure bar test, Hopkinson pressure bar test and orthog- onal cutting test were used. The orthogonal cutting test was to revise the difference between the con- ditions of the pressure bar test and cutting process, and the deformation behavior of the material in cutting process was described more precisely. As an example of the proposed method, the Power Law constitutive model of alloy steel SCM440H was obtained. Three dimensional finite element simulation of face milling process was performed and the simulation results are in good accordance with the ex- perimental data, which prove the method effective in obtained the material constitutive model for cut- ting process simulation.