Abstract:

In order to improve the machining precision of vane surface of integral impeller and the efficiency of cathode movement planning during the electrochemical contour evolution machining, by taking a ruled-surface impeller for example, the effect of twist angle of vane surface on the machining is analyzed, and a movement planning method of contour evolution is proposed. In this method, normal offset curves are obtained from the fitting curve of vane data points, the feature points generated from the offset curves are used to design the movement trajectory of contour evolution, and the results of process experiments are employed to determine the cathode movement parameters. Thus, the negative effect of twist angle on the machining precision is effectively eliminated. It is shown that the proposed movement planning method makes rapid and efficient designs and improves the machining precision for the vane surface of integral impeller.

Key words: electrochemical contour evolution machining, integral impeller, vane surface, twist angle, movement planning