| 摘要 |
PURPOSE:To prevent electrical discharge from centalizing, an electrical discharge machined surface from roughening and a wire electrode from breaking by a method wherein when the gap voltage of electrical discharge machining exceeds a desired level a switching element can be placed automatically into an OFF state. CONSTITUTION:When a machining gap voltage VG rises, a voltage VA also given to one input terminal of a voltage comparator COM rises. And when the voltage VA exceeds the standard voltage Vref, the comparator COM takes an output ''1'', the pulse generator PUL also takes an output ''1'' in that time, a gate circuit GAT does not give pulse signals from an oscillator OSC2 to a switching element Q2 to turn the element Q2 OFF automatically. |
