Ateliers Des Charmilles S.a.

Heinz Rhyner

Francois Balleys

Jean Pfau

Georges-Andre Marendaz

An arrangement for connecting the terminals of the pulse generator of an EDM apparatus across an electrode wire and an electrode workpiece for effecting a cut applied in the machining zone between the electrode wire and the electrode workpiece. The machining current pulses are fed across the machining zone through a pair of sliding contacts, a capacitor being connected across the sliding contacts. One of the sliding contacts is engaged with the electrode wire and the other is connected to the workpiece. The capacitor is alternatively charged by the pulse generator and discharged through a low inductance circuit, thus providing in the machining zone current pulses each of short duration and having a sharp and steep leading edge.

Electrode wire EDM apparatus

A process and apparatus for monitoring the efficiency of an EDM machine by providing an electrical magnitude or signal representing the current flow actually used for machining or, in the alternative, the actual material removal rate. Several circuits are disclosed permitting to provide the operator of an EDM machine with a visual display of the practical efficiency of the machine during a machining operation.

Process and apparatus for monitoring the electrical discharge efficiency

An electro-erosion process and apparatus for improving the rate of material removal from a workpiece and for decreasing the rate of wear of the electrode tool in an electrical discharge machining apparatus, by controlling the average value of the machining current across the machining gap between the electrode tool and the workpiece by providing cut-off time intervals between consecutive pulse trains at a frequency of at least 200 Hz, and by controllably varying at least one of the parameters of operation consisting of the number of the pulses included within a single pulse train, the duration of application of said pulses within a single pulse train, and at least the longest of the intervals of time comprised between two consecutive voltage pulses.

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Geneva, Switzerland

Heinz Rhyner