US Patent No. 9,186,606

MACHINE TOOL WITH CUTTING FLUID FILTRATION DEVICE


Patent No. 9,186,606
Issue Date November 17, 2015
Title Machine Tool With Cutting Fluid Filtration Device
Inventorship Mitsuyoshi Ishihara, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 9,186,606

1. A machine tool with a cutting fluid filtration device, the cutting fluid filtration device comprising:
a contaminated fluid tank which stores a cutting fluid that has been used in machining a workpiece;
a pump which supplies the cutting fluid in the contaminated fluid tank to a filter configured to filter impurities contained
in the cutting fluid;

a clean fluid tank which stores the cutting fluid filtered by the filter;
a lower-limit-position liquid level detector configured to detect a liquid level which requires supply of the cutting fluid
from the contaminated fluid tank to the clean fluid tank;

a pump control unit configured to drive the pump when the lower-limit-position liquid level detector detects that the liquid
level of the cutting fluid is lowered below a preset lower-limit position;

a time integration unit configured to integrate the time during which the liquid level of the cutting fluid is below the lower-limit
position; and

a clogging determination unit configured to determine that the filter is clogged when a preset reference time is exceeded
by the time integrated by the time integration unit.