Method and generator for electrical discharge machining

摘要

The invention relates to a method and a generator for generating a time sequence of discharge pulses for EDM machining wherein a pulse capacitor ( 22 ) for generating the discharge pulse is charged with a charging voltage (U_chrg) and then discharged into the spark gap. The pulse capacitor ( 22 ) after being discharged is recharged with a charging voltage (U_chrg) having the same polarity as that of the residual voltage (U_end) remaining at the pulse capacitor ( 22 ) after its discharge. Thereafter, the pulse capacitor ( 22 ) is discharged with a discharge pulse into the spark gap, wherein the polarity of the discharge pulse is independent of the polarity of the charging voltage (U_chrg) at the pulse capacitor ( 22 ) after its recharge.