| 摘要 |
An apparatus and method for improving the surface finish of a workpiece machined by an EDM apparatus having an electrode tool mounted in a tool holder insulated from the rest of the apparatus structure, the EDM apparatus comprising a pulse generator applying electrical discharges across the electrode tool and the workpiece, and wherein a parasitical capacitor is formed by the tool holder insulated from the rest of the apparatus. The parasitical capacitor, connected across the pulse generator output, is charged and discharged during operation of the pulse generator, and the discharge energy of the parasitical capacitor is added to the energy of the electrical discharge supplied by the pulse generator. For the purpose of obtaining a smooth surface finish on the workpiece with decreased energy of the machining electrical pulses, a compensating inductance is placed in series in the discharge circuit. The compensating inductance preferably takes the form of a high permeability magnetic circuit disposed around a portion of the discharge circuit, for example around a portion of the electrode tool shank mounting the electrode tool in the tool holder.
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