ELECTRIC DISCHARGE MACHINING METHOD AND APPARATUS
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United States of America Patent
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Dec 26, 2012
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Dec 30, 2011
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Abstract
A method of controlling an electric discharge machining apparatus having at least a tool electrode and a workpiece comprising positioning the tool electrode relative to the workpiece; generating at least one first type discharge impulse and at least one second type discharge impulse, wherein the at least one first type discharge impulse has a longer impulse duration than the impulse duration of the at least one second type discharge impulse, wherein the first type discharge impulse causes formation of a protective film against wear on the tool electrode and the second type discharge impulse causes erosion at least on the tool electrode; and applying the first and second type discharge impulses to a gap between the tool electrode and workpiece for material removal from the workpiece, wherein a ratio between the first and second type discharge impulses applied to the tool electrode causes predefined wear of the tool electrode.
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