Patent ID: 6533927
Filing Date: 2003-03-18
Classification: B23H

Abstract:
A dielectric fluid system for an electric discharge machining apparatus for supplying electric discharge machining fluid to a work tank, comprising:a dielectric fluid reservoir for storing electric discharge machining fluid collected from the work tank; an auxiliary tank, the bottom of which is positioned at least as high as a fluid level in the work tank and above the dielectric fluid reservoir; a filter arranged between the dielectric fluid reservoir and the auxiliary tank; a main supply pipe line connecting the dielectric fluid reservoir to the auxiliary tank, and including in series a first pump having an intake side and an outlet side, the filter, and a second pump having an intake side and an outlet side; a circulating pipe line connecting the work tank to the main supply pipe line upstream of the intake side of the first pump and branching from the main supply pipe line at the outlet side of the second pump, and connecting to the work tank; a rapid feed pipe line connecting to the auxiliary tank and the work tank and having a first drain valve; a drain pipe line, connecting the work tank to the dielectric fluid reservoir and having a second drain valve; first and second control valves, positioned at the intake side of the first pump, for selectively opening and closing the main supply pipe line and the circulating pipe line; and third and fourth control valves, positioned at the outlet side of the first pump, for selectively opening and closing the main supply pipe line and the circulating pipe line.