Patent ID: 6730872
Filing Date: 2004-05-04
Classification: B23H

Abstract:
A wire electric-discharge machining apparatus comprising:a control unit which determines a speed of relative movement between a wire electrode and a workpiece based on a voltage corresponding to an inter-pole voltage between the wire electrode and the workpiece; a machining unit which generates a discharge between the wire electrode and the workpiece and relatively moves the wire electrode and the workpiece at the speed of relative movement determined by said control unit to process the workpiece; and an inter-pole voltage correction unit which corrects the voltage corresponding to the inter-pole voltage according to a correction coefficient which increases depending on an increase in discharge stop time, wherein the corrected voltage corresponding to the inter-pole voltage output from said inter-pole voltage correction unit is given to said control unit to relatively move the wire electrode and the workpiece according to the corrected voltage corresponding to the inter-pole voltage.