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Machinability of LM6/SiCp metal matrix composites with tungsten carbide cutting tool inserts

Keywords: metal matrix composites , SiCp , machinability , surface roughness , cutting forces.

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Abstract:

This paper explains the influence of machining parameters such as cutting forces and surface roughness on the machinability of LM6/ SiCp metal matrix composites at different weight fraction of SiCp. Machining tests were carried out at different cutting speed (i.e., 30, 68 and103 m/min) and different depth of cuts (i.e., 0.5, 1.0 and 1.5mm) at constant feed rate i.e., 0.05 mm/rev to study the machinability of as cast composites. It was observed that the depth of cut and the cutting speed at constant feed rate affects the surface roughness and the cutting forces during dry turning operation of cast MMCs. It was also observed that higher weight percentage of SiCp reinforcement imparts a higher surface roughness and needs high cutting forces. This experimental analysis and test results on the machinability of Al/SiC-MMC will provide essential guidelines to the manufacturers.

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