Energy supply control to an electric discharge machine

摘要

The method for machining a workpiece by supplying electric energy in the form of current pulses into machining gap between an electrode and the workpiece in a dielectric medium is characterised by the following steps: (a) operation of switching devices to control a current setting signal corresponding to a pulse to be supplied to the machining gap; (b) superposition of a current component to compensate the drone current produced by the switching operation, with this component combined with the pulse being supplied to produce a resultant current; and (c) the resultant current is fed into the machining gap.The appts. includes two switching systems corresponding to the first and second (superimposed) currents delivered into the machining gap, as well as current detection, signal processing/issuing and other auxiliary devices.