An Experimental Study of the Effect of Machining Parameters on TiB2 /Graphite/Magnesium Reinforced Aluminum 7075 Fabricated Composite by Stir Casting on CNC Lathe for Surface Roughness and Cutting Force by using Taguchi Design

Rajender Singh, Anil Kumar Sharma, Dilip Gahlot

In this experimental study, three TiB₂,Graphite and Magnesium reinforced aluminum 7075 matrix composite with 20 µm in mean size were fabricated by using bottom pouring stir casting technique. Experimental test was conducted to find the machining parameter influencing surface roughness (R_a) and Cutting Force (F_Z) on machining the TiB₂,Graphite and Magnesium reinforced aluminum 7075 composite material. The orthogonal array, the signal-to-noise ratio and analysis of variance were employed to study the performance characteristic in turning on CNC machine of 0, 4, 8 and 12 wt% of TiB₂ and Graphite and 1 wt% of Magnesium particles reinforced aluminum 7075 metal matrix composite. Taguchi technique was used to find the optimal cutting factors for surface roughness (R_a) and cutting force (F_Z).The factors considered were wt% of reinforcement, spindle speed, feed rate and depth of cut. The experimental plan and analysis was based on the Taguchi L₁₆ orthogonal array with four factors. The optimal parametric combination for surface roughness and cutting force was found to be wt% reinforcement, spindle speed, feed rate and depth of cut. The analysis of variance (ANOVA) results show that the feed is the most significant factor for surface roughness followed by depth of cut/reinforcement. From cutting force data also, it is clear that the spindle speed is most significant factor followed by depth of cut.