| 摘要 |
PROBLEM TO BE SOLVED: To dissolve the trouble in cutting work due to the increase of the amount of cutting dusts in a working fluid and contrive to keep a working accuracy and to effectively use the working fluid by a method wherein the specific gravity value of the working fluid in use during its cutting work and one or more of its physical values such as its viscosity value or the like are measured so as to judge the arrival of the use limit of the working fluid when the measured values exceed the thresholds of criterions for judging in order to resupply a new working fluid. SOLUTION: A working fluid 54 is supplied by a pump 56 from a storage tank 58 through a mass flowmeter 71 to nozzles 50 so as to display the results of a mass and a specific gravity measured with the flowmeter 71 through an arithmetic unit on a display. The working fluid 54 fed to a wire train 24 is put together with working cutting dust through a working fluid recovery tray 51 into a recovery tank 95. When the arithmetic unit judges the disposal of a cutting dust-containing working fluid, the fluid sent through the flowmeter 71 to a waste fluid storage tank 79. In order to resupply a new fluid 75, the new fluid 75 is sent from a storage tank 76 through a valve 57 to the working fluid storage tank 52 and its mass is measured with the flowmeter 71 so as to send the measured result to the arithmetic unit. Thus, the poor working due to the increase of the amount of the cutting dusts in the working fluid is dissolved, resulting in realizing the effective use of the working fluid under the condition the working accuracy is kept unchanged.
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