Abstract:

Based on the movement of both the cathode and the anode in the electrochemical machining of an integral impeller, the velocity of the cathode was analyzed, and the velocity components influencing the machining gap were revealed. Then, by analyzing the characteristics of electrochemical contour evolution machining （ECCEM）, the corresponding shaping law was investigated, and the equations to calculate the machining gap betweert the ca- thode and the anode were deduced. Moreover, some experiments were performed to verify the correctness of the proposed equations and to reveal the nonuniformity of machining allowance. Accordingly, a solution was presented to eliminate the error between the theoretical and the machining blades using the additional movements of kinematic axes. By the proposed solution, a workpiece meeting the technical requirements was finally machined through experiments.

Key words: electrochemical machining, spatial movement, shaping law, machining gap, NC programming