叶片型面精密振动电解加工工艺研究

Study on the Process of PECM Blade Surface

采用电解加工工艺对叶片型面进行加工,可以有效提高发动机叶片加工效率,降低生产成本。针对GH4169G合金叶片型面,开展了精密振动电解加工试验研究。结果表明:高频脉冲电流和阴极机械振动具有改善极间流场特性、降低阳极钝化和阴极的产物吸附的作用,可以大幅改善加工效果;采用参数组加工电压15V、阴极振动频率25Hz、开通角度Ra 150°~195°、脉冲频率3000Hz时,获得最优的型面加工质量,型面轮廓度为-0.012^+0.013mm,表面粗糙度值为0.51μm,证明精密振动电解加工工艺满足叶片型面的加工要求。

Blades can be shaped by precise electrochemical machining with short production cycle and low produc-tion costs. A series of experiments using this machining method is performed on GH4169G alloy blades. The results indi-cated that the characteristics of fow feld between electrode and cathode are signifcantly improved. Electrode passivation is reduced and high surface machining quality is obtained. The optimum parameters are voltage of 15V, electrode vibrating frequency of 25Hz, opening angle of 150°-195°, pulse frequency of 3000Hz. Blades produced with profle tolerance of -0.012 - ＋0.013mm and roughness of Ra 0.51μm meet the machining requirements.