A comparative performance of the (Al2O3) cutting tools when dry turning two cast irons

Reference	Presenter	Authors (Institution)	Abstract
12-057	José Vitor Candido	Candido, J.V.(Universidade do Estado de São Paulo);	Gray cast iron or flake graphite iron (FGI) and Nodular Graphite Iron (NGI) has many industrial applications because of its excellent properties how to absorb vibrational energy. FGI exhibit the best machinability than the NGIs because of the present higher pearlite content yielded the shortest tool life. Ceramic materials for cutting tools and high wear resistance applications in demanding environments have seen significant commercial and scientific interest. Alumina is one of the most widely used engineering ceramic materials due to its good physical properties and chemical stability. In the present work, the phase composition and microstructure of two Al2O3 cutting inserts (named sample A and sample B) were characterized by XRD and SEM. The cutting performance and wear mechanism of the cutting inserts were investigated at different cutting speeds on dry turning of gray cast iron and nodular cast iron. Results revealed that the formation of the tribo-films was found to be highly-dependent on the cutting temperature and cutting speed control. The Al2O3-Y2O3 and Al2O3-MgO2 cutting tools inserts can present outperform in machining the selected cast iron workpiece at  certain cutting speeds and cutting temperature range. The flank wear observed in our experiment with FGI and NGI, are explained by the established abrasive wear model with the cutting temperature obtained.
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