超声振动切削对残余应力影响的数值分析

Numerical Analysis of Effect of Ultrasonic Vibration Cutting on Residual Stress

利用AdvantEdge FEM软件对YG6X刀具加工Ti6Al4V合金进行一维和二维超声振动切削仿真,分析超声振动参数对残余应力的影响。模拟仿真表明:一维X向振动时,振动频率和振动幅度对残余应力影响不明显,最大压应力和压应力区深度增大不明显;一维Y向振动时,振动频率越小,残余压应力和压应力区深度越大,振动幅度越大,残余压应力越大,压应力区深度越大;二维振动通过极差分析确定A_(1)B_(1)C_(3)为最佳组合,振动参数对残余应力的影响由大到小依次为A_(y)>(F_(x),F_(y))>A_(x)。结果证明,超声振动切削可以增大工件表层残余应力,改善工件的耐磨性和疲劳强度。

One-dimensional and two-dimensional ultrasonic vibration cutting simulation of Ti6Al4V are carried out by the AdvantEdge FEM software and YG6X tool,and the effect of ultrasonic vibration parameters on residual stress is analyzed.The simulation results show that the influence of vibration frequency and amplitude on the residual stress is not obvious,and the maximum compressive stress and the depth of the compressive stress zone are not obvious.In one-dimensional Y-direction vibration,the smaller the vibration frequency is,the greater the residual compressive stress and the depth of the compressive stress zone is,the greater the vibration amplitude is and the residual compressive stress is,and the greater the depth of the compressive stress zone is.A_(1)B_(1)C_(3) is the best combination of two-dimensional vibration through range analysis.The influence of vibration parameters on residual stress is A_(y)>(F_(x),F_(y))>A_(x).The conclusion is that ultrasonic vibration cutting can increase the residual stress on the surface of the workpiece and improve the wear resistance and fatigue strength of the workpiece.