Abstract
Finishing technology on the wire spark erosion has been investigated for improving the integrity on the machined surface. However, in relaxation type generator used in many factories, some DC leakage current under the de-ionized water causes electrolytic affection and may attack microstructure and/or decrease the hardness on its machined surface.For the improvement on these problems, this paper describes transformer coupling circuit as an adaptor for relaxation type generator.This circuit constructed with pulse transformer is installed between the capacitor and the working gap and converts the waveform to AC out put. Since the gap is isolated from DC source, such electrolytic affection is suppressed.In machining tool steels, no electrolytic corrosion is observed and it is also useful to finish the machined surface with excellent quality.Another advantage of this circuit installed on the rectangular pulse generator can deliver micro-power pulses to the working gap at high performance, and make it possible to keep the surface roughness less than 2μm R even in a dielectric water of high conductivity.
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