A kind of precision electrolytic machining device and machining method of closed cascade structure blade

Abstract

The invention relates to a precision electrolytic machining device and a machining method for a closed blade cascade structure blade. The precision electrolytic machining device includes a machining electrode and a machining water jacket. The machining electrodes are arranged in pairs. The machining electrodes include a cathode plate, an inner root rounded cathode, an outer root rounded cathode, a connecting stud and a driving device. The inner root rounded cathode and the outer The root rounded cathodes are arranged oppositely and are slidably connected to the driving device; the cathode plate is arranged between the inner root rounded cathode and the outer root rounded cathode, and one end of the cathode plate is connected to the other through the connecting stud. The driving device is connected, and the two sides of the cathode plate are respectively slidably connected with the inner root rounded cathode and the outer root rounded cathode. The invention improves the machining accuracy and efficiency of the overall rectifier, greatly simplifies the technological process, and simplifies the technological implementation process.

Description

technical field [0001] The invention relates to the technical field of electrolytic machining, in particular to a precision electrolytic machining device and a machining method for a blade with a closed cascade structure. Background technique [0002] In the design of fans and compressors of military and civilian turbofan aero-engines, a large number of components such as integral blisks and closed rectifiers are used. The materials of such components are mostly high-temperature alloys, titanium alloys, etc., and the cutting performance is very poor; the cascades are dense, the blades are light and twisted, and the flow channels are inclined; the blade profile and position accuracy are high, these characteristics make the traditional machining. It becomes very difficult, which is manifested in serious deformation and difficult control of deformation, serious tool wear, resulting in extremely low processing efficiency, high cost and poor surface quality. [0003] Electrolyti...

AI Technical Summary

Problems solved by technology

[0005] Currently, integral rectifiers (such as attached figure 1 ) blade surface processing mainly refers to the method of precise electrolytic machining of the blade surface of the overall blade disc, that is, the double-sided (blade pot, blade back) machining cathode is used to move towards each other synchronously, and the precision of the blade pot and blade back profile is carried out. shape, and then insulate and protect the leaf pot and leaf back profile, and then process the inner and outer flow channels and their root fillets respectively (as shown in the attached figure 2 ), since the leaf pot, leaf back, internal and external flow channels and their root fillets are formed separately, the manufacturing and assembly accuracy of tooling and cathodes is high, and the blade pot and leaf back surface that are first precision electrolytically formed need to be insulated In order to prevent stray corrosion on the surface during the processing of the inner and outer root fillets; in addition, after the completion of the precision electrolytic machining of the inner and outer root fillets, the processed leaf pot, leaf back profile and inner and outer The cutting area of ​​the root fillet is subjected to multiple iterations of trimming (trimming, testing, trimming...) (as attached image 3 ), the process is complicated, and the process implementation is very difficult

[0006] Based on the difficulty in preparing the cathode of the tooling caused by the step-by-step processing method in the actual situation, the complicated insulation protection process of the processed area, and the difficulty in trimming and handling the knife-connected area, how to improve the processing accuracy and efficiency of the overall rectifier can greatly simplify the process and improve the process. Easier implementation process is a technical problem that those skilled in the art need to solve urgently

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