| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric discharge machining device provided with both high machining accuracy and speed particularly suitable for fine machining. SOLUTION: In the electric discharge machining device, a work piece is machined by applying voltage from a power source for machining to an interval formed by an electrode and the work piece, generating electric discharge and relatively moving the electrode and the work piece. It is characterized by that it is provided with a current detecting means of detecting a current fed from the power source for machining and converting it into an analog voltage, a comparator means of comparing a voltage proportional to the detected current with a reference voltage and outputting a logic signal, a pulse width stretching means of storing a logic value for a certain time by using either one of rising or falling of the logic signal as a trigger, an OR means of determining a logical sum of an input and output of the pulse width stretching means, and a discharge state detecting means comprising a smoothing means of smoothing a logic signal output of the OR means and converting it into an analog voltage. COPYRIGHT: (C)2003,JPO
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