Experimental evaluation on tribological properties of nano-particle jet MQL grinding

Tribological properties of nano-particle jet minimum quantity lubrication (MQL) grinding were mainly evaluated in K-P36 NC surface grinder. Under dry grinding, flood grinding, MQL grinding and nano-particle jet MQL grinding working conditions, the tribological properties were evaluated from the perspectives of grinding force, frictional coefficient, G-ratio, grinding temperature and surface roughness. The results showed that nano-particle jet MQL grinding improved the heat exchange capability; the temperature reduced by nearly 150 degrees C compared with that in dry grinding. Compared with dry grinding, frictional coefficient in MQL grinding, nano-particle jet MQL grinding and flood grinding was decreased successively and respectively by 11.22%, 29.21% and 32.18%. The surface roughness Ra of workpiece prepared by dry grinding was 1.2 mu m, and the Ra value of nano-particle jet MQL grinding was 0.58 mu m. The G ratio of nano-particle jet MQL grinding was 33, the highest of all four conditions. The G-ratio of dry grinding was only 12, which was about twice the value in other conditions.