Experimental investigation on the efficiency of the wrap around nozzle as coolant delivering system for ultra high speed grinding

In recent years, attention has been given to develop efficient and optimised cooling systems for grinding to reduce the process cost and to limit the health hazards of operators. In ultra-high speed grinding this issue is particularly complex because the thick air barrier rotating with the grinding wheel prevents the fluid from reaching the grinding zone. In this paper, results of experiments conducted to characterise the application of the wrap around nozzle (WRN) to the ultra high speed plunge surface grinding are presented. Experiments were conducted in a peripheral wheel speed ranging from 50 to 380 m/s and the effects of the nozzle position. This efficiency was compared to a cooling system composed of double air scrapper and a conventional jet type system. Experiments showed that the WRN has higher and much stable cooling efficiency in the ultra-high-speed range of the grinding wheel.