Clean manufacturing of Ti-6Al-4V under CO2-snow and hybrid nanofluids

Abstract

During the machining of α+β intermetallic stable titanium alloy, their poor thermal conductivity and resistance at elevated temperature accumulates most of the shearing and friction heat. The resulting heat damage the cutting tool, causes in high power consumption, shorter tool life and poor surface quality. Therefore, it is important to choose a latest cooling technique with excellent capacity to remove heat, chips and frictional effects from the cutting zone. Therefore, Carbon dioxide snow (CO2-snow) and hybrid copper oxide (CuO)-multi-walled carbon nanotubes (MWCNTs) nanofluids based minimum quantity lubrication (MQL) are compared to achieve clean cooling/lubrication technique to machine biomedical/aerospace material Ti-6Al-4V. Taguchi L9 orthogonal array was applied to design the experiments. Critical machining parameters are cutting speed (m/min), feed (mm/rev), and cooling mode. The output responses are surface quality Ra (μm), cutting power Pc (W), cutting temperature T (oC), and tool life TL (min) were evaluated under CO2-snow and MQL-hybrid nanofluids. Findings have revealed less surface roughness and longer tool life under hybrid nanofluids. While CO2-snow has justified less temperature and power consumption at high cutting conditions.