Abstract
Al 7075 metal matrix composite (MMC) augmented with 15 wt% SiC particles (SiCp) of mean particle size (MPS) 8 µm was fabricated through vortex stir cast method, followed by T6 thermal treatment. The thermal treated MMC ingot was dry turned using multiple titanium nitride coated tungsten carbide (WC) tools to investigate the tool flank wear (Fw) and cutting force components (tangential component-Pz, thrust component-Py and feed component-Px). Turning parameters were optimized and regression model was generated for Fw. Also parametric significance on Fw was determined through Analysis of Variance (ANOVA) at the confidence level of 95%. Results revealed that Fw increased on enhancing speed of cutting (Vc), feed (s) and cutting depth (t); however, optimal parametric combination for Fw was 40 m/min (Vc), 0.05 mm/rev (s) and 0.2 mm (t). Vc was the most significant for Fw, taken after by s; but t was insignificant. Pz was of highest magnitude among all the three force components during turning the MMC. Consistent rise of all the force components was observed either on increasing t at different levels of s or on increasing s at different levels of t, while turning the MMC at constant Vc of 45 m/min.
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