Die-sinking EDM progresses by repeatedly generating pulsed discharge between the electrode and the workpiece. In the process, the machining speed is slow because all the removed parts are discharged for debris. In the past, a scooping EDM method using a frame electrode has been proposed. The machining speed is fast because the removed part is not processed as debris, but is removed as a mass. However, it is applied only to zinc alloys because the frame electrode disappears due to electrode wear. In this study, we propose bottom cutting EDM using a thin plate electrode that can theoretically ignore electrode wear. In order to bend the thin plate electrodes in the horizontal direction, highly rigid stainless steel and phosphor bronze were selected as the electrodes. However, it was difficult to use both electrodes because of large electrode wear or an unstable discharge state. Therefore, we devised a hybrid electrode in which a copper thin plate was attached to the tip of both thin plate electrodes. Using the hybrid electrode, the characteristics of horizontal cutting EDM were investigated.
TAKEZAWA et al. (Wed,) studied this question.