Electrical discharge machining by means of a wire electrode
AssigneeAteliers des Charmilles S.A.
InventorsJohann Janicke, Georges-Andre Marendaz
Life of this patent
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Abstract
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.
Claims18
In a process for machining a workpiece electrode by means of intermittent electrical discharges applied between a wire electrode and said workpiece electrode, wherein said electrodes are relatively displaced along a programmed path of a predetermined shape and the machining gap between the electrodes is adjusted as a function of the machining conditions, the improvement comprising varying the speed of relative displacement of the electrodes as a function of the shape of said path such as to maintain constant the distance between the longitudinal axis of the wire electrode and one of the surfaces of the workpiece electrode.
In an apparatus for machining by means of intermittent electrical discharges applied between a wire electrode and a workpiece electrode wherein said electrodes are relatively displaced according to a programmed path of predetermined shape and the machining gap between said electrodes is adjusted as a function of the machining conditions, said apparatus comprising means for displacing said wire electrode and said workpiece electrode relative to one another, the improvement comprising means for developing at least one electrical signal varying as a function of the radius of curvature of said path, and means for varying said relative speed of displacement as a function of said electrical signal.
Dependencies are inferred from the claim text.