Types of cutting fluids PDF

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This cutting fluid serves two basic purposes – cooling and lubrication. For cooling, the cutting fluid removes generated cutting heat from the machining zone, and thereby protects the tool and job from over-heating. So the cooling action is based on generated heat. For lubrication, the cutting fluid acts as a lubricant and reduces the dynamic co-efficient of friction between rake surface and chip, and thereby minimizes the rate of heat generation. Thus lubrication action starts before heat generation occurs rather than after heat generation as in case of coolant. Apart from cooling and lubrication, the cutting fluid also flushes away chips and debris from the cutting zone. Various similarities and differences between coolant and lubricant pertinent to machining are given below in table format.

Difference between coolant and lubricantautomotive

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Soluble Oilcoolant

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Enginecoolant

Types ofcoolantused in machining

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Engine oil

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During conventional machining or metal cutting, excess material is gradually removed from the workpiece in the form of chips using a wedge shaped cutting tool. Primarily due to continuous rubbing between moving chips and rake surface of cutting tool, intense heat is generated at the cutting zone. In continuous machining, this cutting heat leads to increase in temperature at the cutting zone. Excessive cutting temperature has several detrimental effects on both cutting tool and job. Such effects include, but are not limited to, burning of machined surface, chatter marks, high wear rate of cutting tool, poor surface quality and poor machinability. To maintain the cutting temperature within limit, suitable cutting fluid (also called metal working fluid) can be applied in the cutting zone.

water-basedcoolantfor machining

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