Research On Numerical Control Electrochemical Machining Technology Of The Integral Impeller With Big-twisted Blades

Because the technology of Numerical Controlled Electrochemical Contour Evolution Machining(NC-ECCEM) not only has the advantage of traditional ECM, but also has the advantages of Numerical Controlled Machining(NCM), and ideally suited to the machining of complex shaped components made from high strength and heat resistant alloys. Through many year's research and a lot of experiments, some important progresses on machining integral impeller's blade profile have been acquired. Based on the former research, notch machining of the integral turbine with big-twisted blades is systematically and deeply studied in this thesis.Firstly, the feature and the application situation of NC-ECCEM and the integral impeller are introduced in this thesis, then the modern machining methods of integral impeller are introduced in classification, through comparing these methods with each other, the status of NC-ECCM is affirmed in machining the integral impeller with big-twisted blades.Aiming at this kind of integral impeller, the geometry structure must be studied deeply before a suit of reasonable technical scheme bring forward. In this thesis, the entity modeling of this kind of integral impeller is completed by UG software which has strong function in surface modeling, based on this, the feature of geometry structure and some hard to resolve problems are analyzed.In order to resolve these problems, a technological scheme is designed, and essential academic calculating is completed. The main research work includes: (1) Key process problems such as the designing method of tool-cathode and flow field are studied. (2) The overcut of blade back and the short circuit in gas exit are discussed. (3) The effective means are presented to avoid overcut in the triangle field of blade root.Finally, machining experiments are carried out and the results are deeply analyzed. Test results show that the improved technological scheme not only can solve the technological problems, but also can be convenient for application and shorting cost.