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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。
The hole making process is a very important part of the aircraft structure assembly. According to the drilling process of aircraft thin-walled structural parts, the finite element simulation model of the twist drill drilling process is established. The 3D explicit numerical simulation of the drilling process is carried out by the general explicit dynamic analysis program LS-DYNA. The simulation dynamically simulates the formation process of drilling cuttings and burrs during drilling, obtains the auger drill cuttings, extracts and analyzes the characteristics of the drilling axial drilling force, and analyzes the characteristics of the cutting tools and workpieces during the machining by using the direct thermal coupling finite element method Interfacial friction heat generation and transient distribution of drilling temperature. Simulation results show that burr burr may be generated during drilling and drilling, and burr burr is larger than burr burr. The simulated axial drilling force is consistent with the theory.