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AssigneeCharmilles Technologies S.A.
InventorsFabrice Jaques, Sebastian Dorthe, Maurizio Tognolini, Guy Demule, Ernesto Buhler
Estimating the term…
The electrical discharge machining device comprises a first voltage/current source (U1) 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 (U2) that can be disconnected by way of two switches (SW1, SW2). Capacitive elements (C1, C5) are mounted in series in the lines (10, 11) 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.
1-12. (canceled)
An electrical discharge machining device comprising a tool electrode (F) and a workpiece electrode (P) forming the poles of a machining gap (G), at least one voltage/current source (U1) connected by an electrical circuit (E) to the tool electrode (F) and to the workpiece electrode (P) and configured for generating electrical pulses and for establishing the initiation of electrical discharges between the tool electrode (F) and the workpiece electrode (P), at least one capacitive element (C1) close to or within contacts (W1, W2) located between said electrical circuit (E) and the tool electrode (F), the capacitive element (C1) is connected in series between the source (U1) and one of the poles of the machining gap (G) wherein it prevents DC components of electrical pulses coming from the source (U1) from being applied across the machining gap (G) and to allow variable current components coming from the source (U1) to flow, wherein the total capacitance (Ceq) of said electrical circuit (E) is reduced with respect to the machining gap (G).
The machining device as claimed in claim 16, further comprising at least one switch (SW3, SW4) installed across the terminals of the capacitive elements (C1, C5) and designed to short-circuit or to render active the capacitive elements across whose terminals it is installed.
Dependencies are inferred from the claim text.