| 摘要 |
PROBLEM TO BE SOLVED: To control working fluid filtering timing on the basis of the led-in numerical value objectively reflecting the degraded degree of a machining fluid in powder-mixed electric discharge machining. SOLUTION: In performing electric discharge machining of a workpiece 10 by applying pulse voltage while interposing a working fluid mixed with powder material, in a machining clearance formed between an electrode 12 and the workpiece 10, machining time is measured every machining condition, and the product of an average machining current, the measured machining time and a coefficient reflecting the degradation speed of the working fluid under the machining condition is computed every machining condition. The degraded degree of the working fluid is judged with the accumulated total value of the respective products of every machining condition as the degraded degree of the working fluid.
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