US Patent No. 9,364,911

WORKING FLUID SUPPLY DEVICE OF ELECTRIC DISCHARGE MACHINE


Patent No. 9,364,911
Issue Date June 14, 2016
Title Working Fluid Supply Device Of Electric Discharge Machine
Inventorship Daisuke Yoshizaki, Yamanashi (JP)
Yoshinori Makino, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 9,364,911

1. A working fluid supply device of an electric discharge machine, wherein the electric discharge machine is configured to
machine a workpiece immersed in a working fluid in a working tank the working fluid supply device configured to supply the
working fluid to the working tank and comprising:
a cleaned-fluid tank;
an ion-exchange resin;
a refrigerator;
a pump configured to draw up a cleaned fluid from the cleaned-fluid tank;
a first fluid circuit configured to supply the cleaned fluid drawn up by the pump to the working tank;
a second fluid circuit configured to supply the cleaned fluid drawn up by the pump to the ion-exchange resin and the refrigerator;
a first valve provided in the first fluid circuit;
a second valve provided in the second fluid circuit; and
a controller configured to open and close each of the first and second valves so that the cleaned fluid drawn up by the pump
is alternatively supplied to the first fluid circuit and the second fluid circuit.