齿轮齿面超声挤压强化有限元模拟

Finite Element Simulation of Gear Tooth Surface by Ultrasonic Extrusion Strengthening

超声挤压强化可有效改善零件的表面质量,对齿轮进行超声强化可有效提高其传动的疲劳寿命和可靠性能。采用有限元分析法研究超声挤压强化过程中不同工艺参数对齿轮表面残余应力的影响规律。首先建立了齿轮超声挤压强化的三维有限元模型,然后基于该模型研究了静压力、进给速度、振幅对齿轮超声挤压后表面残余应力的影响规律。结果表明:超声强化后,齿轮表面残余应力约为360 MPa,静压力和工具头进给速度对强化后的残余应力分布影响较大,随着静压力增加,齿面最大残余应力和残余应力深度增大;随着工具头进给速度增加,表面最大残余应力和残余应力深度降低;而不同的振幅对齿面的残余应力影响差别不大。

Ultrasonic extrusion strengthening can effectively improve the surface quality of parts.The ultrasonic strengthening can effectively improve the fatigue life of the gear and reliability of its transmission. The influence of different process parameters on the residual stress of gear surface during ultrasonic extrusion strengthening process is studied by finite element analysis. First,the three-dimensional finite element model of gear is established. Then the influence of static pressure,feed speed and amplitude on the surface residual stress of gear after ultrasonic extrusion strengthening is studied based on the model. The results show that the residual stress of gear surface is about 360 MPa after ultrasonic strengthening,and the influence of static pressure and tool head speed on residual stress distribution after strengthening is relatively large. With the increase of static pressure, the maximμm residual stress and residual stress depth of tooth surface increase. With the increase of tool feed rate,the maximμm residual stress and depth of residual stress decrease. While the effect of different amplitude on the residual stress of the tooth surface is very small.