流动应力模型对刀具温度有限元分析的影响

The Influence of Workpiece Flow Stress Models on Finite Element Analysis Results of Tool Temperatures

正交切削有限元分析过程中,被加工工件的流动应力数据是影响结果的重要参数。通过对AISI-1045材料高速切削加工过程进行有限元建模与计算,比较三种典型流动应力模型即Johnson-Cook、Oxley和Zerilli-Armstrong模型对切削过程仿真以及切削区域尤其是刀具温度分析所产生的影响,发现三种模型所得到切屑成形过程不同,尽管温度分布和变化的基本规律一致,但相同加工条件下具体温度数值相差很大。

Work flow stress data are the important parameters impacting the results of finite element analysis in orthogonal cutting. By modeling and calculating of the processes of high-speed cutting for AISI-1045 using finite element method, three typical flow stress models, Johnson-Cook, Oxley and Zerilli-Armstrong, were used to simulate the cutting processes and analyze the temperatures in cutting zone, especially at tool. The results show that, with the three models, the processes of chip forming are different, and though the general trends of temperature distributions and changes obtained by the three models are consistent, temperatures are far from equals under the same conditions of machining.