金属二次切削残余应力的有限元分析

残余应力是影响构件表面完整性的重要因素,合理分析和研究连续切削状态下构件表面的残余应力,对现实生产有很大的指导意义。本文通过建立二次切削有限元模型,将一次切削完成以后的应力、应变场作为初始边界条件加载到二次切削过程中,运用可靠的材料模型及切屑分离手段,合理施加位移和速度边界条件,对金属二次切削过程进行数值模拟,得出了不同切削次序、切削深度和刀尖圆角半径对工件表面残余应力的影响规律。这对进一步研究连续切削过程及机械加工的表面完整性具有较高的参考价值。

Finite Element Analyses of Residual Stress on Secondary Metal Cutting

Residual stress is an important factor to affect the surface integrity.As a result,correct analysis and study on the surface residual stress of sequential cut are of great significance.In this study,an elastic-plastic finite element model is exploited to simulate the second metal cutting process.The stresses and strains after completion of the first cut are used as the initial boundary conditions for the second cut process.And reliable material model,cuttings separation principles,reasonable displacement and velocity boundary conditions are also used in this model.Then,the simulation results have shown the effect of cutting sequence,cutting depth and radius of the tool nose on residual stress of the workpiece surface.This study has great reference value for the further research of sequential cut process and surface integrity.