组合式凸轮轴径向滚花装配机理及连接强度研究

基于耦合的欧拉-拉格朗日网格及Johnson-Cook材料模型,建立了涉及局部大变形的组合式凸轮轴径向滚花、压装及扭转子模型.各子模型间通过传递轴管的残余应力应变场实现相互串联,保证物理场的连续性,系统地模拟径向滚花装配全流程.预测并分析了压装力、静扭强度及凸轮型线的变化特征,揭示了滚花刀参数及进给量对压装力及静扭强度...

Research on Joint Strength and Radial Knurling Connection Mechanism of Assembled Camshafts

 A finite element predictive approach involving severe plastic deformation of the materials and including three subsequent models（knurling， press-fit and torsion strength） were established  based on the coupled Euler-Lagrangian mesh and Johnson-Cook material model. The sub models were connected in series by transferring the residual stress and strain fields of the shaft tubes to ensure the continuity of the physical fields. The whole process of radial knurling assembly was systematically simulated by connecting each working step model in series； the press-fit force， static torsional strength and the variation characteristics of the cam profiles were predicted and analyzed. The influence law of knurling tool parameters and feed rate on the press-fit force and static torsional strength was revealed. It is shown that numerical results of morphological characteristics of shaft tubes in knurling and assembly area as well as temperature field are in good agreement with the experimental work. The torque strength of the joint is 90% higher than that of a typical passenger vehicle requirement. The torque strength is significantly positive correlated to the press-fit loads. The max displacement of outline of cam is not less than 0.0425 mm. The predicted press-fit and joining strength using the subsequent modeling are validated by the experimental measurement with maximum errors less than 11%. The subsequent models may partly take a place of knurling assembly tests， which is instrumental in shorten development cycles.