燃气弯管弧面结构电解铣削加工特性研究

Study on Electrochemical Milling Characteristics of Arc Surface Structure on Gas Elbow Pipe

液氧煤油火箭发动机燃气弯管具有尺寸较大、形状特殊的三维空间弧面结构,利用传统拷贝式电解加工技术难以获得理想的加工形貌。针对弧面结构燃气弯管的加工难点,研究采用电解铣削技术进行加工,基于新一代液氧煤油火箭发动机燃气弯管的尺寸等比缩小样件,试验了具有弧面结构的316L不锈钢在NaCl溶液中不同工艺参数下的电解铣削加工特性。结果表明:在电压40 V、加工间隙0.3 mm、电极扫描速度20 mm/min的加工参数下可得到表面形貌良好的90°圆弧面工件,初步验证了电解铣削技术进行宏观尺度弧面结构的加工可行性。

The gas elbow pipe of liquid-oxygen kerosene rocket engine has a three-dimensional arc structure with large size and special shape,and it is difficult to obtain an ideal machining appearance by using traditional electrochemical machining technology.Aiming at the processing difficulties of the arc structure on gas elbow pipe,the research adopted electrochemical milling technology for processing.Based on the size of the new generation liquid-oxygen kerosene rocket engine gas elbow pipe,the size of the sample was scaling down,and the 316L stainless steel with the arc structure was tested using electrochemical milling technology in NaCl solution under different parameters.The results showed that under the processing parameters of 40 V voltage,0.3 mm machining gap and 20 mm/min electrode scanning speed,an arc surface workpiece with improved surface morphology could be obtained,which preliminarily verifies that the electrochemical machining technology has a feasibility for macro-scale arc structure processing.