航空发动机叶片前后缘自由式砂带抛光技术

由于叶片前后缘(LTE)的轮廓形状和表面质量将对航空发动机的气动性能和叶片的疲劳性能产生直接影响,因此为提高前后缘的轮廓度和表面质量,通过对目前航空发动机叶片前后缘抛光所存在的问题进行分析,结合叶片前后缘抛光工艺要求,并基于自由式砂带抛光的工艺特点,提出了叶片前后缘自由式砂带抛光工艺方法;针对该抛光工艺方法,建立其砂带张紧力控制系统,确定了抛光加工中的砂带走刀步长计算公式及抛光轨迹规划方法;最后以某型号叶片的前后缘作为加工对象进行抛光实验研究。检测结果显示:叶片前后缘轮廓度误差小于0.01mm,其表面粗糙度小于0.4μm,证实了该抛光工艺方法对提高叶片前后缘的轮廓度和表面质量的有效性。

Freestyle belt polishing technology for leading and trailing edges of aero-engine blade

As the key part of the blade,the leading and the trailing edges (LTE) play a very important role in aero-engine.The profile of the LTE can directly affect the aerodynamic performance of aero-engine,and its surface quality can largely determine the fatigue life of the blade.To reduce the profile error and improve the surface quality,the problems existing in LTE polishing process are analyzed.Based on the polishing requirements of LTE and the process features of abrasive belt polishing,the method of freestyle belt polishing process with tension force control system for LTE is proposed.The calculation formula for feeding step length and polishing path planning method are obtained.The polishing experiments of a blade are carried out.The test results show that the profile accuracy and surface quality of LTE are improved significantly,with the profile error being less than 0.01 mm and roughness less than 0.4 μm.