バイポーラ接続方式による電解ターニング

Abstract

Peripheral and face turning processes with a segmental cathode were studied under conditions of constant cell voltage and feed rate. Relationships between the machining gap width and process variables, such as feed rate, duty factor, rotation rate, etc., were described theoretically. Experiments were performed to verify the model. Type 304 stainless steel and a nickel-base superalloy, Hastelloy X, were machined in a 3 mol/dm3 NaNO3 electrolyte at 30°C. Results show that equilibrium conditions were established in peripheral turning with a tapered cathode and in face turning, although the process becomes intermittent by using a segmental cathode. In peripheral turning with a parallel cathode, the process has no equilibrium condition because of no relative feed of the cathode to the workpiece. The rotation rate has no effect on the machining gap width, except for the rates less than about 5 rpm. The final workpiece diameter during peripheral turning is determined primarily by the inclination angle and length of the cathode, while other variables have only a secondary importance on it. For face turning, a simple equation between the equilibrium gap width and process variables was derived by using an effective feed rate defined as a feed rate divided by a duty factor.