Patent ID: 6505091
Filing Date: 2003-01-07
Classification: B23H

Abstract:
An electric discharge machining control method in which an electrode and a workpiece have a specific distance between them in a machining liquid, a voltage is applied between the electrode and the workpiece, and the workpiece is machined with a generated electric discharge, said method comprising:detecting a machining state; filtering a detected value, indicating the machining state, with a notch filter having a notching frequency corresponding to one of a rotational frequency of an electrode and a mechanical resonance of a driving system for moving and rotating the electrode; computing an error signal from an output value obtained by the filtering and a set value of a machining state; computing a control variable, for controlling movement of the electrode, from the error signal and a set movement value of the electrode; and moving the electrode in a specific direction and, at the same time, rotating the electrode about an axis perpendicular an opposite surface of the workpiece, according to the control variable.