铸造机匣管接头、凸台特征铣削加工余量优化方法

Optimization Method of Feature Milling Machining Allowance for Pipe Joints and Bosses of the Casting Aero Engine Case

近年来,随着航空领域技术的发展,航空发动机的性能及设计结构在不断地改进和提高,同时也大大增加了航空发动机关键零部件的制造难度,其中较为典型的有铸造机匣。机匣铸造过程中的热变形等原因,导致机匣表面的管接头和凸台等特征的几何误差较大,从而进一步导致后续铣削加工过程中出现余量分配不均匀等问题。针对铸造机匣铣削加工过程中出现的这类问题,提出了一种基于特征位置匹配的余量优化方法,以在机测量结果作为数据输入,根据测量结果计算待加工特征的最佳拟合位置,并将计算得到的位置经刚体变换作用到加工坐标系上,以实现零件加工余量的均匀化。经加工试验验证表明,加工过程中未出现过欠切,降低了刀具磨损,零件经检测质量合格。

In recent years,with the development of technology in the aviation field,the performance and design structure of aero engines have been continuously improved and increased,at the same time,it also greatly increased the difficulty of manufacturing key components of aero engines.Among of them,one of the most typical parts was the casting aero engine case.Due to the thermal deformation during the casting process of the casing,the shape and position errors of the pipe joints and bosses on the surface of the casing were relatively large,which further caused problems such as uneven distribution of allowance during subsequent milling processes.Aimed at such problems that occurred during the milling process of the casting box,a margin optimization method based on feature position matching was proposed.This method took in-machine measurement results as data input,calculated the best fit position of the feature to be processed according to the measurement results,and applied the calculated position rigid body transformation to the processing coordinate system to achieve the uniformity of the machining allowance of the part.The test verification showed that there was no over-cutting and under-cutting during the machining process,which reduced tool wear,and the quality of the parts was qualified.