Charmilles Technologies S.a.

Sebastian Dorthe

Maurizio Tognolini

Roland Martin

Fabrice Jaques

Ernesto Bühler

Guy Demule

The electrical discharge machining device comprises a first voltage/current source (U) for discharge initiation connected to the tool electrode (F) and a workpiece electrode (P) forming the poles of a machining gap (G) and a second voltage/current source (U) that can be disconnected by way of two switches (SW, SW). Capacitive elements (C, C) are mounted in series in the lines () connecting the first source to the poles of the machining gap (G). In addition, these poles can be connected by a self-induction coil (Lm) mounted in series with an adjustable DC source (Sm). Thanks to these features, the energy of the eroding discharges can be significantly reduced in order to obtain a superfine surface finishing process of high quality, while at the same time precisely controlling the mean voltage across the terminals of the machining gap.

Device for machining by electroerosion

The device for machining by electroerosion comprises an electrode-tool (EO) and an electrode-workpiece (EP) constituting the opposite poles of a working gap (GA) and an electrical circuit with a double voltage source (UD) connected to a supply network (A) arranged so as to produce erosive discharges between the electrode-tool (EO) and the electrode-workpiece (EP). This double voltage source (UD) comprises a first (U) and a second (U) voltage source connected galvanically to each other by their poles. This double source (UD) is connected to the working gap by at least four separate branches (Bto B) of which at least one comprises a self-induction element (LL, LL). Switching elements (SW, SW) permit producing by selective connection of the branches at least two increasing current slopes and at least two decreasing current slopes.

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St. Ursen, Switzerland

Sebastian Dorthe