| 摘要 |
PURPOSE:To make such an electric-discharge machining power source as being inexpensive and for practical use securable, by constituting the power source so as to use a pulse power source, having small internal impedance, only when a pole gap state is in normal, in case of the electric-discharge machining power source using a conductive machining solution. CONSTITUTION:An electric-discharge machining power source includes each of DC power sources 17 and 22 of first and second pulse power sources. Next, a select control circuit 27 is preset to turn on the DC power source 22 in time of a machining start, and thereby a voltage waveform and a power waveform both are produced in a pole gap. And, when the gap voltage is higher than a short circuit voltage detecting level and the gap power source is lower than a current detecting level, it is regarded as normal between pole gaps whereby no signal is transmitted to the circuit 27 from a short circuit detecting device, and the pulse power source 17 is turned on after the elapse of a set time so that such voltage capable of starting the discharge is generated, producing an electric current there. After this machining current is made to run, a quiescent time as specified is provided for machining. Thus, an inexpensive and practical power source is securable. |
