Discharge state refers to the spark gap when edm within each pulse discharge of the basic state when.
Generally divided into five kinds of discharge status: open, spark discharge, short circuit, arc discharge, excessive arc discharge. Various discharge status in practice of processing, alternately probabilistic to appear (and processing rules allowed and feed, clearance pollution and so on about), even in a single pulse discharge process, also may appear alternately over two kinds of discharge status.
(1) open (no-load pulse) the spark gap no breakdown, the gap has more than 50 V voltage, current through the gap but not have inside, in order to no-load condition.
(2) spark discharge (work pulse, or say effective pulse) in good insulation performance gap, working liquid medium breakdown can effectively thrown out, after removal in metal.
(3) short circuit (short circuit pulse) the spark gap connect directly short circuit, this is because the servo drive system into too much or discharge to instantaneous gaps in electrical erosion products have lap be caused by. Clearance short circuit current is bigger, but the gap on both ends of the voltage is small, not removal in processing function.
(4) arc discharge (stable arc discharge) scraps discharge due to bad, discharge points centered in some local and not scattered, local heat accumulation, temperature, vicious circle, this time the spark discharge will become arc discharge, because discharge fixed at a particular point or a local, so called stable arc, often use the electrode surface carbon, burns.
(5) excessive arc discharge (not stable arc discharge, or called unstable spark discharge) excessive arc discharge of precursor. Early detection out excessive arc discharge, to prevent arc burns has great significance.
