表面滚压强化工艺的数值仿真

FE Simulation of Surface Rolling

针对圆棒工件表面进行多圈连续进给滚压强化工艺,提出了Marc有限元的三维数值仿真模型。通过边界条件施加、滚动的实现、接触设置等有限元建模的建立和修正,取得了与实际十分吻合的滚压成形的仿真结果;在分析残余应力形成过程的基础上,提出了改进的滚压过程模型;比较了不同进给量、网格划分及边界条件对残余应力分布的影响规律。结果表明,与以往的单圈或者不足一圈的滚压、滑动滚压,或者轧辊不转动的静止压入等简化条件下的仿真模型相比,仿真模型更接近实际的滚压过程,因而也获得了比较理想的变形和残余应力的仿真效果。

This investigation carried out 3D FE simulation of surface rolling process of the round bar workpiece under circulatory rolling and continuous rolling feed by Mare. The plastically formed result which agrees well with experimental result was obtained by establishing and modifying the boundary conditions, realization of rolling and setting of contact. A modified model of surface rolling progress was brought forward on the basis of analyzing the forming progress of residual stress. The influences of different feed rate, meshing and boundary conditions in the distribution rules of residual stress were discussed by comparison. The result indicates that this simulation model is more similar to the actual roiling progress compared with the simplified models in which single circle or less than one circle rolling or sliding rolling is adopted or rollers press without rolling, so it obtained a more ideal simulation effect of plastically formed result and residual stress.