Abstract
The present article investigates the effect of graphite particles in the drilling of hybrid aluminium matrix composites (AMCs) using TiN coated carbide drills. Materials used for the present investigation are Al6063-aluminum alloy reinforced with alumina of size 20 microns and graphite of an average size 75 microns, which are produced through stir casting method. Experiments are conducted based on Taguchi’s method L27 orthogonal array on a vertical machining centre. A model is developed to correlate the drilling parameters with burr height and surface roughness using regression analysis. The results indicate that the developed model is suitable for prediction of burr height and surface roughness in drilling of hybrid AMCs.The influence of different parameters on Surface roughness and burr height of Al6063/Al2O3p/Grp composites has been analyzed through ANOVA table and contour graphs.DOI: http://dx.doi.org/10.5755/j01.ms.22.3.9724
Highlights
The present article investigates the effect of graphite particles in the drilling of hybrid aluminium matrix composites (AMCs) using TiN coated carbide drills
It was concluded that incorporation of graphite in Al2219/15SiCp composite produced discontinuous chips leading to easy machining and graphite particles creates deep valleys and pits on the machined surface which increases the surface roughness values
The lower surface roughness and minimum burr height is the indication of better performance
Summary
The present article investigates the effect of graphite particles in the drilling of hybrid aluminium matrix composites (AMCs) using TiN coated carbide drills. A model is developed to correlate the drilling parameters with burr height and surface roughness using regression analysis. Composites with HSS drill and concluded that tool life gets increased while machining graphite reinforced aluminium matrix composites compared to the base alloy. Since graphite acts as a solid lubricant, it reduces the friction at tool–work interface Due to this action a small amount of energy is required for drilling the composite compared to the base alloy. Taguchi method L27 orthogonal array used to find the optimum drilling parameters and with the help of analysis of variance (ANOVA) investigated the influence of parameters on the burr height of composites.
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