Experimental Evaluation of the Workpiece Surface Quality of MoS2/CNT Nanofluid for Minimal Quantity Lubrication in Grinding

Abstract

An experimental research on effect of MoS2/CNTs hybrid nanofluid minimum quantity lubrication (MQL) grinding on workpiece surface quality of difficult-to-cut materials is carried out based on research status of nanofluids MQL. Surface roughness Ra, autocorrelation analysis of contour curve and surface topography (SEM) are studied in research. Experimental results show that nanofluid MQL avoid burn phenomenon due to nanoparticles can significantly improve heat transfer of nanofluids. The MoS2/CNT hybrid nanoparticles achieve lower surface roughness Ra value and grinding peak temperature than single nanoparticles because of "physical synergistic effect". Influenced by viscosity of nanofluids, surface roughness (Ra) increases gradually with the increase of mass fraction of nanofluid. Friction coefficient and grinding peak temperature, influenced by "agglomeration", decreases firstly and then increases with the increase of mass fraction of nanofluid, reaching the valley at 6%. According to the autocorrelation analysis, nanoparticle improves the grinding accuracy due to the "lubrication effect" and "micro-machining". It conclude that 6%, "agglomeration" phenomenon occurred concentration, MoS2/CNTs is the optimum concentration for nanofluid MQL in the experiment.