基于精密电解工艺的叶片进排气边形状控制方法

Leading and Trailing Edges Shape Control Method of Blade Based on PECM

针对高温合金复杂曲面叶片进排气边尺寸和形状的高精度要求,开展了精密电解加工试验研究。结果表明,利用振动进给电解机床与优化电极设计方法可以有效提高电解加工叶片进排气边尺寸形状精度。使用电导率85~90m S/cm,温度25℃的Na NO3电解液,叶盆和叶背电极振幅0.4mm,振频40Hz可加工出中心型面进气边形状满足设计要求,排气边接近设计要求的试件。在此基础上,探索采用振动光饰工艺作为精密电解加工技术的辅助手段解决叶片进排气边形状控制难题的方法。

Aiming at the size and shape accuracy of edges of superalloy complex curved blades,an experimental study on precision electrolytic machining(PECM)was conducted.The results show that the use of vibration feed ECM machine tools and optimization of cathode design methods can improve the size of the leading and trailing edges accuracy by PECM processing.Using conductivity of 85-90mS/cm and 25℃electrolyte of NaNO3,amplitude of 0.4mm and vibration frequency of 40Hz process the shape of leading edges of the center profile meet the design requirements,and trailing edges is close to the design requirements.On this basis,as a supplementary means of PECM,exploring to solve the problems of the shape control of blade edges by combining with vibration lighting process.