Abstract
Hard turning process is widely used in manufacturing industries. The main problem associated with hard turning is the high frictional heat generation. Traditionally cutting fluids are used to control the heat generation. However, the major drawback related with the use of cutting fluids is the environmental pollutions. The use of solid lubricants during machining is another alternative technique to control the heat generation. It is environmental as well operator friendly. Therefore, in this research work, an experimental study has been conducted to investigate the performance of solid lubricants assisted hard turning. The hexagonal boron nitride (h-BN) and zinc sulfide (ZnS) were taken as a solid lubricating medium. The cutting speed, feed rate, workpiece hardness and tool nose radius were selected as process parameters. The cutting force and chip tool interface temperature were taken as performance indicators. The experiments were performed by using central composite design. The significance of process parameters was analyzed by performing analysis of variance (ANOVA). The second order mathematical models of cutting force and chip tool interface temperature were formulated. The optimal value of the process parameters which provides minimum cutting force and chip tool interface temperature was suggested. The experimental results were compared with dry and wet conditions of machining. The results indicate that solid lubricants have shown better machining performance when compared to dry and wet conditions.
Published Version
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