Experimental comparison of MO40 steel surface grinding performance under different cooling techniques

Cutting fluids pollute the environment and harm human health. Cryogenic grinding with liquid nitrogen and carbon dioxide gas is a new method that is used to create a cleaner environment and maintain human health. In order to investigate the effect of the cooling method in the grinding process, surface roughness and hardness were compared in the presence of lubricating fluid and cryogenic cooling with three speeds and three grinding depths. The results of this study showed that except for high depths of cut and cutting velocities, the obtained surface quality with liquid nitrogen and carbon dioxide gas was better in comparing to lubricating fluid. In addition, in high depths of cut and cutting velocities, the obtained hardness from liquid nitrogen and carbon dioxide gas is higher in comparing to lubricating fluid. Then, by using ANOVA, that is concluded the depth of cut is the most effective parameter on surface roughness and hardness. Keywords: Grinding, Coolant, Cryogenic, Surface roughness, Hardness