A Novel Influence of Coated and Uncoated Carbon Boron Nitride on Material Removal Rate for Al-Si12Cu Alloy Using CNC Turning

Abstract

The prime aim of this experimental study is to find the material removal rate (MRR) of CBN (Carbon boron nitride) coated and uncoated insert on Al-Si12Cu alloy via a novel computer numeric controlled (CNC) turning center. Al-Si12Cu alloy of 50 mm diameter and 200 mm length was utilized for this study. The samples (N = 20) are turned by CBN coated insert (experimental group) and the uncoated insert is considered as the control group to machining another 20 samples (N = 20). The weight of Al-Si12Cu alloy on both group samples was measured before and after the turning process via a digital weighing machine followed by MRR was calculated as per ASTM standard with 80% G-power calculation. Based on the experimental test results of MRR for the turned Al-Si12Cu alloy by CBN coated insert showed 2.762 mm 3 /min and 1.781 mm 3 /min were found gives a significant value of 0.001 (p < 0.05). There is a significant difference between the two groups considered. The two-tailed significance value obtained is 0.001 (p < 0.05) which is statistically significant compared to the uncoated insert showing the adequacy of the design matrix and there is a significant difference have been between the two groups. Within the limitations of this experimental study, the Al-Si12Cu alloys were turned via CBN coated insert has played a prominent role in the enhancement of MRR rather than the samples turned by the uncoated insert.