AEROSOL CHARACTERISTICS AND TURNING PERFORMANCE OF MAGNETIC MINIMUM QUANTITY LUBRICATION

Magnetic minimum quantity lubrication (mMQL) technology could improve the wettability, penetration and deposition performances of magnetic nanofluid droplets in the machining region, enhance the lubrication and cooling capacity of the oil mist, and reduce the oil mist concentration in the machining environment. Based on the construction of mMQL machining system, the effects of different magnetic field intensity on the viscosity, droplet size and penetrability of Fe3O4 magnetic nanofluid were analyzed. The steady-state heat transfer capacity, oil mist concentration and cutting performance of mMQL were studied. The results showed that under the influence of magnetic field produced by mMQL, the viscosity, particle size and penetrability of the magnetized droplets was enhanced. Compared with traditional oil-based MQL, the cutting temperature, oil mist concentration, tool flank wear and roughness value of mMQL were reduced by 17%, 36%, 19% and 18%, respectively. During the process of mMQL, the magnetized droplets with improved viscosity and penetrability were easy to be adsorbed, infiltrated and spread on the tool-workpiece interface, which was conducive to the lubrication and heat transfer of the cutting interface, and thus presented better turning performance.