航空结构件典型特征的虚拟高性能加工研究

Virtual High Performance Machining of Typical Features of Aerospace Structures

航空整体结构件由不同的典型特征构成,对整体结构件加工性能的研究,可以通过分别对典型结构特征的加工性能进行研究,然后再组合特征进行特征关联研究的方法实现。虚拟加工是研究切削加工过程的重要仿真方法。在虚拟环境下构建由典型特征组合而成的被加工零件,然后分别应用大进给铣削和大切深铣削两种高性能加工策略进行加工仿真试验。试验结果显示:大进给铣削策略下的主切削力、切削功率和材料去除率明显小于大切深铣削策略下的,并且大进给铣削策略下的比能耗在转角特征处出现明显的突变点。分析发现,由于在转角特征处频繁升降进给速度,使得大进给铣削策略下的材料去除率与理论值出现较大偏差。

Aerospace monolithic component was composed of different typical characteristics, the research on the machining properties of the monolithic component can be implemented by studying the machining properties of typical structure characteristics, respectively, and then combining characteristics to study the correlation of characteristics. Virtual machining is an important simulation method to study the machining process. In this paper, the machined part, which was made up of typi- cal features, was constructed in virtual environment. The two high performance machining strategies of high feed milling and high cutting depth milling were applied to machining simulation experiments, respectively. The experimental results show that the main cutting force, cutting power and material removal rate under high feed milling strategy are obviously less than that of high cutting depth milling strategy, and the specific energy consumption of high feed milling strategy has obvious mutation point at the comer characteristic. It is found that the material removal rate of high feed milling strategy has a large deviation from the theoretical value due to the frequently up and down of the feed speed at the comer characteristics.