低浓度电解液管电极电解加工冷却孔实验研究

Experimental study on electrochemical machining of cooling hole by tube electrode in low concentration electrolyte

以航空发动机常用材料Inconel718镍基高温合金为基材进行电解加工,得到气膜冷却孔。通过几组对比实验,分析了低浓度电解液电解加工中电极进给速率和加工电压对加工精度、加工效率和加工稳定性的影响,得到低浓度电解液电解加工冷却孔的最优工艺条件为:NaNO_3质量分数4%,柠檬酸钠质量分数2%,电极进给速率6μm/s,加工电压8 V,在该工艺条件下,精度控制好,加工效率高,加工过程稳定。

Film cooling holes were obtained by electrochemical machining using Inconel718 nickel - based superal- loy commonly used for aero -engine as the substrate. The effects of electrode feed rate and machining voltage of electrochemical machining in low concentration electrolyte on precision, efficiency and stabili- ty of the machining process were analyzed through several groups of comparative experiments. The opti- mal process parameters of electrochemical machining in low concentration electrolyte were obtained as follows ： NaNO3 4wt%, sodium citrate 2wt%, feed rate of electrode 6 ixm/s and machining voltage 8 V. The process features good precision, high efficiency and good stability under the given conditions.