铍材切削加工温度场和应力场的数值模拟

Numerical Simulation of Temperature and Stress Fields in Beryllium Cutting Process

摘要:

采用MSC.Marc软件对铍材切削加工温度场和应力场进行热力耦合有限元分析，铍材本构关系采用Johnson-Cook模型，编写子程序模拟铍材切削断裂分离现象。结果表明：铍材切削加工过程温升不明显，最高温度约45 ℃，切削后工件表面平行和垂直于走刀方向残余应力分量均为拉应力；采用工艺获得铍材切削稳定状态下切削力和进给力分别为280和–250 N/mm。此研究有助于加深铍材切削应力形成规律认识以及切削工艺参数优化

Abstract:

Using the MSC.Marc software, the temperature and stress fields in beryllium during cutting process are studied by employing a thermo-mechanically coupled finite element method (FEM). The constitutive equation of beryllium is fitted with the Johnson-Cook plasticity model, and an user subroutine is written for modeling the chip separation after fracturing. The results show that the temperature in beryllium increases only a little and the highest temperature is about 45 ℃. Both of the residual stress components for parallel and vertical to the cutting direction are tensile on the surface of beryllium after cutting. The cutting force and thrust force are 280 and –250 N/mm, respectively, during the cutting steady state if the cutting process is adopted in this paper. This study is helpful to enhance the understanding for stress formation and the optimizing for the beryllium cutting process.