Abstract
This paper investigates the machinability characteristics of a high-leaded Brass alloy (CuZn39Pb3) by considering the effect of rotational speed; feed rate and depth of cut on main cutting force Fc, arithmetic surface roughness Ra and maximum height of profile Rt during its longitudinally turning. An L18 mixed-level Taguchi Orthogonal Array experimental design was established so as to systematically examine the effect of machining conditions on the aforementioned responses. Full quadratic regression models were developed for correlating the experimental and fitted data after the statistical analysis for studying the significance of the cutting conditions to main cutting force Fc, arithmetic surface roughness Ra and maximum height of profile Rt. Experimental results have shown that depth of cut holds dominant effect of cutting force whilst its contribution equals to 73.61%. Rotational speed and feed rate have just as important effect on arithmetic surface roughness average with 38.85% and 32.15% contributions respectively. For the maximum height of the profile, rotational speed has a significant contribution equal to 42.38% of the overall significance. The models created can explain the investigated parameters’ variation to the percentages of 99.44%, 97.29% and 96.76% for main cutting force Fc, arithmetic surface roughness Ra and maximum height of profile Rt respectively.
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