基于热-力耦合磨削表层残余应力的仿真分析

Simulation Analysis of Ground Surface Residual Stress with Thermal-Mechanical Coupling Principle

为研究磨削后工件表面残余应力的分布特征需要先进行磨削区温度场的分析.通过建立磨削区温度场的数学模型和传热模型,应用ANSYS分析不同磨削参数对磨削区温度场的影响,仿真结果表明磨削深度对最高温度的影响最大.结合磨削过程中产生的磨削力,用APDL程序对磨削区的热-力耦合场进行ANSYS分析,获得工件在恢复室温时磨削残余应力大小及分布状态,揭示热-力耦合情况下对磨削表面残余应力形成的影响机制.通过残余应力试验对比试验结果和仿真结果,验证了仿真方法的有效性.

In order to research the distribution characteristics of workpiece grinding surface residual stress, grinding temperature field should be analyzed firstly. The influence of different grinding parameters on grinding zone temperature field was analyzed by using ANSYS through the established mathematical model of temperature field and heat transfer. The simulation results show that the influence of the cutting depth on the highest temperature is the largest. Using APDL program combined with the grinding force produced in grinding process, the thermal-mechanical coupling field of the grinding surface was simulated and analyzed. The size and distribution state of the residual stress were obtained and the thermal-mechanical＇s influence on the residual stress was discussed and uncovered. Finally, the correctness of the simulation result was verified through the comparison of residual stress test results and simulation results.