Novel Uses of Al2O3/Mos2 Hybrid Nanofluid in MQCL Hard Milling of Hardox 500 Steel

Abstract

In recent years, the application of environmentally friendly cutting fluids in the metal cutting industry has been a growing concern in all over the world. In this study, the minimum quantity cooling lubrication (MQCL) technique, which uses very small amount of cutting oil, is motivated to apply to the hard milling process of Hardox 500 steel. Further, rice bran oil, a natural biodegradable oil, is used as the base fluid of Al2O3/MoS2 hybrid nanofluid. ANOVA analysis is used to study the influences of nanoparticle concentration, cutting speed, and feed rate on surface roughness. The obtained results indicate that good surface quality is achieved and the cutting speed is significantly increased to 140 m/min (about 2.55–2.80 times higher than the recommended values) due to the better cooling and lubricating effects from MQCL system and Al2O3/MoS2 hybrid nanofluid. Moreover, the microstructure of the machined surface proves the formation of MoS2 tribo film by using Al2O3/MoS2 hybrid nanofluid, indicating that the effectiveness of each type of nanoparticle in hybrid nanofluid has been promoted. Furthermore, the important technical guides for machining Hardox 500 steel are provided.

Investigation of the Effects of Nanoparticle Concentration and Cutting Parameters on Surface Roughness in MQL Hard Turning Using MoS2 Nanofluid

“…In addition, the nanoparticles easily adhere to the top of the cutting edge, causing scratches on the machined surface. This phenomenon is formed and lost continuously, thus deteriorating surface quality [34]. For high cutting speeds, the workpiece shear strength decreases because the cutting heat is high enough to reduce the required cutting forces and positively affect the machined surface finish.…”

A review of advances in tribology in 2020–2021

“…Duc et al [246] studied the effects of nanoparticles used as additive in nanofluid on cutting performance and surface roughness in the minimum quantity cooling lubrication (MQCL) technique. They found the outstanding lubrication and cooling effects of Al 2 O 3 /MoS 2 hybrid nanofluid with the evaluation of different nanoparticle concentrations, cutting speeds, and feed rates.…”

Lubrication Mechanisms of a Nanocutting Fluid with Carbon Nanotubes and Sulfurized Isobutylene (CNTs@T321) Composites as Additives

“…The study showed that the increase in the concentration of SiO 2 nanoparticles promoted the growth of the tool-chip interface protective film, and the film that formed on the machined surface improved the surface quality of the workpiece and reduced the cutting temperature and cutting force [11]. Long T M et al used MoS 2 nanosheet nanofluid and Al 2 O 3 /MoS 2 hybrid nanofluid in minimum quantity cooling lubrication (MQCL) hard milling, and the obtained results indicated that better cooling/better effects and good surface quality were achieved [12,13].…”