考虑壁板单向压紧制孔瞬时回弹的压紧力优化

飞机大部件对接自动化制孔采用蒙皮侧单向压紧制孔技术，而由于在常见的自动化制孔系统中叠层材料被钻透的瞬间产生瞬时回弹，对制孔设备和加工质量等方面造成严重的影响，针对该问题进行机身蒙皮侧制孔压紧力优化分析。通过有限元分析方法进行制孔过程的模拟仿真，根据不同环境下的回弹现象，确定压紧力优化分析方案，综合考虑接触间隙、瞬时回弹和制孔刚性的影响，进行多目标优化分析，从而得到最优的压紧力工艺参数。计算结果表明，在飞机常见框间对接段自动化钻孔中，采用轴向力为150 N的麻花钻时压紧力的最优解为314.54 N，采用轴向力为100 N的自动化一体钻时压紧力的最优解为362.73 N。通过现场试验，压紧力最优解满足生产要求，实际最优压紧力低于最优解不超过20 N，因此考虑不同加工环境等因素构建合理的工艺参数选定范围。 

Optimization of pressing force considering instantaneous springback in skin-side pressed drilling

The automatic drilling for the docking of large parts of aircraft adopts the skin-side pressed drilling technology, and the instantaneous springback of the lamination material in the common automatic drilling system has serious influence on the drilling equipment and hole quality. The optimization analysis of the pressing force of the skin-side pressed drilling was carried out for this problem. The finite element simulation analysis method was used for the simulation of hole making process. According to the springback phenomenon in different environments, the optimal analysis scheme of pressing force was determined. Considering the influence of contact gap, instantaneous springback and drilling rigidity, multi-objective optimization analysis was carried out to obtain the optimal pressing force process parameters. The calculation results show that, in the automatic drilling of the docking area between the common frames of the aircraft, the optimal solution of the pressing force is 314.54 N when using twist drill with an axial force of 150 N, and 362.73 N when using automated integrated drill with an axial force of 100 N. Through on-site test, it was verified that the pressing force optimization analysis results meet the production requirements, and the actual optimal pressing force is less than 20 N lower than the pressing force optimization analysis results. Therefore, the different processing environments and other factors were considered to construct a reasonable range of process parameters.