| 摘要 |
PURPOSE:To make it possible to make a processing fluid supply device small-sized and enhance its cooling effect by supplying dirtied fluid of a high temperature via a direct type cooling device to a dirty fluid tank and supplying clean fluid after being filtered from a 1st clean tank to a 2nd clean tank equipped with a cooling device. CONSTITUTION:Dirtied fluid in a dirty fluid tank 3 is filtered by a filter 7 by means of a pump P1 and supplied to a 1st clean tank 5-1. The clean fluid in the clean fluid tank 5-1 flows over a dam 15 into a 2nd clean tank 5-2 and is circulated and cooled between a cooling device 9 by a pump P2. The clean fluid cooled to an appropriate temperature in the 2nd clean tank 5-2 is then supplied by a pump P3 to both upper and lower nozzle portions of a machine to remove machining chips as well as to cool a machined portion and flows down from a machining tank 13 to a dirty fluid tank 3. Here, a arranging a direct type cooling device 17 at an upper portion of the dirty tank 3, the hot dirty fluid is cooled by being dropped like rain drops through holes to perform cooling by direct heat exchange with air A and by latent heat of evaporation. Thus, dielectric fluid of an appropriate temperature can be supplied by means of a small-sized cooling device.
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