Patent ID: 7645958
Filing Date: 2010-01-12
Classification: B23H

Abstract:
1. An electric-discharge-machining power supply apparatus for applying electric-discharge-machining pulse voltage to a machining gap between a machining electrode and an object to be machined, comprising: an electric-discharge pulse generating unit, which generates and applies voltage to the object of positive and negative polarity with respect to the machining electrode; and a circuit comprising a parallel connection of a rectifying element and a resistive element coupled in series along a wiring path, to the electric-discharge pulse generating unit and the machining gap and in parallel with a charging capacitor, wherein machining pulse currents flow through the rectifying element, when the object is in the positive polarity with respect to the machining electrode, and through the resistive element when the object is in the negative polarity with respect to the machining electrode.