Evaluation of Material Removal Rate of Novel Al-Zn5Mg Alloy Using TiN Covered and Uncovered Ceramic Insert by CNC Turning

Abstract

The main scope of the research about comparing the material removal rate (MRR) on Al-Zn5Mg alloy using TiN covered and uncovered tools through a CNC (Computer numerical controller) machining center. Al-Zn5Mg alloy of 200 mm length and 50 mm diameter was used for this study. The 20 Al-Zn-5Mg alloy samples are considered for novel CNC turning operation with TiN covered tool (experimental group). Another 20 Al-Zn5Mg alloy samples are machined the same way but the tool is changed to an uncovered ceramic tool (control group). The weight of each sample before and after the turning process is calculated via a digital weighing machine with ±0.001 gram accuracy. The system of MRR measuring follows the standard of ASTM with 80% G-power calculations. The evaluated results for this experimental study of MRR on Al-Zn5Mg alloy machined by TiN covered tool and uncovered ceramic tool found 1.598 mm 3 /min and 1.254 mm 3 /min respectively. The test results were statistically analyzed via the SPSS (Statistical Package for the Social Sciences) tool and gave a two-tailed significant value of 0.003 (p < 0.05). There is a significant difference between the two groups considered. The two-tailed significance value obtained is 0.003 (p < 0.05) which is statistically significant. Within the limitations of this present study, the Al-Zn5Mg alloy was turned by TiN covered and uncovered ceramic tools through a CNC (Computed numeric control) machining center. The higher MRR is found in the machining operation with TiN covered tool. The value of MRR is greater than the MRR of uncovered ceramic tools.