提高航空发动机叶片反拷法电解加工精度的实验研究

Experimental Study on Anti-copy ECM of Aero-engine Blades for Higher Machining Accuracy

反拷法电解加工涉及不可逆的二次电解加工过程,加工精度很难控制,无法满足航空发动机叶片的制造需求。在分析反拷法电解加工误差产生原因的基础上,以提升加工精度为目的,提出了小加工间隙反拷法电解加工方法。以加工典型的航空发动机叶片为例,开展不同加工间隙条件下的反拷法电解加工对比实验,结果表明:加工间隙由拷贝工具0.49 mm/反拷工件0.53 mm减小至拷贝工具0.23 mm/反拷工件0.23 mm,叶片型面轮廓精度由0.14 mm提升至0.05 mm,该结果验证了提出方法的有效性。

Anti-copy electrochemical machining（ECM） is difficult to control machining accuracy because it involves two irreversible ECM processes. So it can′ t meet the precision requirements of aero-engine blades. The study aims to increase the accuracy of anti-copy ECM and find the factors which influence the machining accuracy. The anti-copy ECM experiments under different machining gaps were launched. The results show that when the machining gap changes from 0.49 mm（copying tool）/0.53 mm（anti-copying workpiece） to 0.23 mm（copying tool）/0.23 mm（anti-copying workpiece）,the accuracy of blade profile changes from 0.14 mm to 0.05 mm,the results verify the validity of the proposed method.