Abstract:

In order to solve the problems existing in the machining of the aeroengine＇s integral impeller, an improved electrochemical machining process, namely, the fractional-step method, is presented based on the one-step method. In the investigation, first, a fractional-step machining process of the blade is proposed. Then, the machining data of the blade are extracted via the section-cutting method. Moreover, with the help of a specific software for the electrochemical machining of the integral impeller, the processing region of different procedures are reasonably divided and the machining path is planned. Thus, the motion path of tool cathode and the displacements of the axes can be calculated, and the corresponding NC machining program can be generated. Finally, some machining tests are conducted to verify the feasibility of the proposed method. The results show that the proposed method effectively solves the key problems existing in the blade machining of the integral impeller and that it improves the sha- ping accuracy and shortens the preparation time.

Key words: integral impeller, electrochemical machining, path planning, region division