Ateliers Des Charmilles S.a.

Georges-Andre Marendaz

Francois Balleys

Heinz Rhyner

Johann Janicke

A process and apparatus for monitoring machining conditions in a travelling wire EDM apparatus. The resistivity of the machining fluid in the machining zone is measured and is compared to a reference value. A signal is provided as soon as the measured resistivity increases beyond the reference value and the signal is used for decreasing or interrupting the machining current.

Apparatus and method for monitoring the machining conditions of an EDM

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

In an EDM process and apparatus, an arrangement for automatically correcting machining errors while effecting a cut in a workpiece by means of a wire electrode when the cutting path of the wire electrode relative to the workpiece is along a curve or an angle, for example, rather than along a straight line. The speed of relative displacement between the wire electrode and the workpiece electrode is automatically varied as a function of the shape of the cutting path, such that the distance between the longitudinal axis of the wire electrode and of one of the cut surfaces of the workpiece is maintained constant, irrespective of the curvature or angularity of the cutting path.

Electrical discharge machining by means of a wire electrode

A pulse generator for an electro-erosion machining apparatus wherein electrical discharges occur at a machining zone formed between an electrode workpiece and an electrode tool, the pulse generator comprising a capacitor charged from a source of direct current through an inductance and a switch for discharging the capacitor through the primary of a transformer, the electrode tool and the workpiece being connected across the secondary of the transformer, the capacitor being charged at a predetermined current rate and being discharged when the voltage across the capacitor reaches a preset level.

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Meyrin, Switzerland

Georges-Andre Marendaz