Funkenerosionsimpulsgenerator und Verfahren zum Funkenerodieren von Werkstuecken

Spark erosion pulse generator comprising an energy storage chargeable from a direct current source, in particular a capacitor (CO) which is switchable to achieve discharges in the working gap of two electrodes (10, 11) of a spark erosion machine by means of an erosion high-current switch (E1, E2) and having a bridge circuit (12) powered by the capacitor (CO) and having the spark gap formed by the electrodes (10, 11) in their diagonals (17), in whose diagonals (17) the spark gap formed by the electrodes (10, 11) is arranged, having high-current switches (E1, E2) in half arms (13, 14) of their two bridge arms (12', 12''), situated at opposing ends of the bridge diagonal and switchable in series, and having current valves (D1, D2) in the other half arms (15, 16) of their two bridge arms (12', 12'') situated at opposing ends of the bridge diagonal, said current valves being switched in series across the spark gap at the same polarity. In order to perform faster and more efficient erosion, the spark erosion pulse generator is designed in such a way that one bridge arm (12'') has a parallel arm (23) in which a controllable switch (E<-R )and a buffer storage (CP) are switched in series, and a bridge point (19) located between the bridge points (20, 21) serving to switch the capacitor (CO) and the parallel arm point (24) located between the switch (E<-R ) and the buffer storage (CP) via a ...