Method for electric discharge machining of a workpiece and corresponding apparatus
AssigneeAgie SA
InventorsStefano Angelella, Rino D'Amario
Life of this patent
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Abstract
A method and apparatus for wire cutting electric discharge machining to achieve precise surfaces with Ra<0.1 microns. An intermittent operation is used with erosion pulses for primarily machining and erosion pulses for measuring any excursion of the wire electrode from the rest position. An evaluation unit is used to determine any excursions of the wire electrode from the rest position that might have been present during the preceding machining time, and a controller controls the machining process so that the wire electrode is practically straight during electroerosion.
Claims17
Method for electrical discharge machining of a workpiece by means of a wire electrode in the most precise possible machining process, characterized by the fact that:
- machining occurs intermittently, in which erosion pulses are applied during machining times on the work gap and erosion pulses with a low repetition frequency are applied during measurement times lying in between, so that
- the wire electrode seeks its rest position because of the restoring force of wire tension during measurement time, and that
- any excursions of the wire electrode from the rest position that might have been present during the preceding machining time are determined in the micrometer range, and
- the machining process is controlled based on this, so that the wire electrode is practically straight during erosion.
Apparatus for electrical discharge machining of a workpiece by means of a wire electrode in the most precise possible machining process, characterized by:
- a control of a pulse generator, which is set up so that machining occurs intermittently, during which the erosion pulses are applied during machining times on the work gap, and erosion pulses are applied during the measurement times lying in between with low repetition frequency, so that the wire electrode seeks its rest position by the restoring effect of wire tension during measurement time,
- an evaluation unit, which determines any excursion of the wire electrode from the rest position that might have been present during the preceding machining time in the micrometer range, and
- a controller which controls the machining process based on this, so that the wire electrode is practically straight during erosion.
Dependencies are inferred from the claim text.