基于ANSYS/LS-DYNA钻削过程的数值仿真

Finite Element Simulation for Thin-panel Drilling Process With ANSYS/LS-DYNA

制孔工序是飞机结构装配中一个非常重要的环节。根据飞机薄壁结构零件钻孔工序,建立麻花钻钻削加工过程有限元仿真模型,采用通用显式动力分析程序LS-DYNA对钻削加工过程进行三维数值仿真研究。仿真动态模拟了钻削加工时钻屑和毛刺的生成过程,获得了螺旋钻屑;提取并分析了钻削轴向钻削力特征;采用直接热力耦合有限元方法分析了加工过程中刀具和工件间摩擦热的产生及钻削温度的瞬态分布。仿真结果表明,钻削毛刺在钻入和钻出都有可能产生,且钻出毛刺大于钻入毛刺。仿真得到的轴向钻削力与理论相符。

Drilling is an important process and widely used in the aircraft assembly.According to the practical application of drilling process in the aircraft,a three-dimensional drilling dynamic simulation model is established for the drilling of thin-wall structural parts to simulate the drilling process using the commercial explicit dynamic analysis program LS-DYNA.The formation of cutting chip and burr is simulated and the drilling force is predicted by the model.The generation of frictional heating and the transient temperature field during drilling were analyzed by the direct thermo mechanical coupling field finite element method.The screw drilling cutting can be found from simulation.The result shows that drilling burr is generated both in the process of drilling in and out and the burr at drilling-out is found to be bigger than that at drilling-in.The axial drilling force of result shows that the analysis agrees well with the theory.