Abstract
Soluble oils are the largest class of oils used in metal cutting industry. Flood cooling involves problems related to its treatment and disposal. Minimum quantity lubrication in the form of mist application can be used to replace flood cooling. But as less amount of cutting fluid is used in minimum quantity lubrication, its capacity to carry away heat and providing adequate lubrication is limited. Hence, the heat-carrying and lubricating ability of soluble oil has to be enhanced. Graphite has better lubricating and cooling properties and hence inclusion of graphite nanoparticles in cutting fluid may help in formulating a better coolant in machining operation. This article compares the performance of mist application of nanographite-soluble oil with dry lubrication, flood lubrication and mist application of soluble oil without nanographite in turning AISI 1040 steel. Performance is evaluated based on experimental measurement of average chip–tool interface temperature, tool wear and cutting forces. The results showed that use of nanographite-soluble oil in mist application has greatly improved the cutting conditions by lowering the temperature generated, reducing the tool wear and reducing the cutting forces.
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