航空整体结构件铣削加工变形预测研究

为了揭示航空框类整体结构零件铣削加工的变形行为，提出了一种基于接力计算模型的航空整体框结构零件铣削加工全过程物理仿真方法，阐述了接力计算的基本原理，设计了接力计算系统的完整框架.基于以上接力计算系统，通过将零件加工工艺信息转化为有限元仿真计算信息，采用有限元模型对整体框结构零件进行了铣削加工全过程数值模拟.模拟综合考虑了材料毛坯内初始残余应力、切削载荷、加工顺序和走刀路径等因素.通过铣削加工实验验证了建立的有限元模型的正确性.研究结果表明，基于接力计算的数值模拟方法是研究航空整体结构零件铣削加工变形的有效方法，可正确预测零件加工变形.

Distortion prediction for milling process of aerospace monolithic components

A physics-based material processing simulation was approached to aerospace monolithic components due to milling process. A basic principle of reveal the distortion law of restart analysis was expatia ted, and its completed system frame was designed. The milling process information was converted to finite element simulation information, and milling process procedure of a part was simulated based on the restart analysis system. Key factors influencing distortion such as initial residual stress, cutting loads, cutting sequence and path were synthetically considered. The finite element model was verified based on the machining experiment. The result showed that the milling process simulation based on the restarting analysis is an effective method predicting the machining distortion law correctly.