Improvisation of Machining Parameters for Better Surface Finish of MMC Material using Taguchi Method

Abstract

Metal matrix composite is used in engineering applications due to its superior mechanical properties. MMC’s are reinforced with particle fiber, whisker, and particulate. The size of particulates used is classified as micro, nano, and macro. The particulate reinforced MMC’s have excellent form-ability compared to fiber and whisker composite. Metal matrix composite has outstanding wear, heat resistance, and excellent mechanical properties. Many authors have been stated the property as its ability of workpiece material to be machined or it refers to workpiece response to machining or it is normally applied to the machining properties of work material or it indicates how easily and fast a material can be machined. MMC materials are difficult to machine with a superior surface finish. In this study Al6061 with Silicon Carbide and Graphite are fabricated with 5 weight % using squeeze casting route. Tensile strength and hardness are tested according to ASTM standards and as a result, there was an increase in tensile strength and hardness of MMC. Machining process parameters plays a vital role in defining surface roughness. This machining parameters are to be optimized to get the better surface finish results. Taguchi techniques is used. To optimized the machining parameters affecting machining of MMC for surface roughness are identified. Orthogonal array L9 was selected based on three parameters with three levels. There is a vital role played by the feed rate in increasing the surface roughness of the material. Relevant process parameters considered for a better roughness of the surface are, cutting speed 300RPM, the rate of feed 0.13 mm/rev, and the depth of cut 0.4mm.