Precise electrolytic machining device and method for blade of closed blade grid structure

Abstract

The invention relates to a precise electrolytic machining device and method for a blade of a closed blade grid structure. The precise electrolytic machining device comprises machining electrodes and a machining water jacket, and the machining electrodes are arranged in pairs. Each machining electrode comprises a cathode plate, an inner root fillet cathode, an outer root fillet cathode, a connecting stud and a driving device, wherein the inner root fillet cathode and the outer root fillet cathode are oppositely arranged and are connected to the driving device in a sliding mode, the cathode plate is arranged at the position between the inner root fillet cathode and the outer root fillet cathode, one end of the cathode plate is connected with the driving device through the connecting stud, and the two sides of the cathode plate are in sliding connection with the inner root fillet cathode and the outer root fillet cathode correspondingly. Through the precise electrolytic machining device and method, the machining precision and efficiency of a whole rectifier are improved, the technological process is greatly simplified, and the technological implementation process is simpler.

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 blades with a closed cascade structure. Background technique [0002] In the design of fans and compressors of turbofan aeroengines for military and civilian use, 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 poor; the cascades are dense, the blades are bent and twisted thin, and the flow channels are inclined; the blade surface contour accuracy and position accuracy are high. These characteristics make traditional machining It becomes very difficult, manifested in severe machining deformation and difficult to control the amount of deformation, serious tool wear, resulting in extremely low processing efficiency, high cost, and poor surfac...

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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