Experimental comparison of carbon-dioxide and liquid nitrogen cryogenic coolants in turning of AISI 1045 steel

摘要

This experimental work is carried out to investigate the performance and influence of cryogenic coolants such as CO_2 (carbon dioxide) and LN_2 (liquid nitrogen) on cutting temperature, cutting force, tool wear, surface finish and chip morphology in machining of AISI 1045 steel compared to wet machining. The results proved that the application of cryogenic coolants reduced the cutting temperature drastically which resulted in appreciable improvement in surface finish of the product and reduced tool wear. The use of cryogenic LN_2 reduced the cutting temperature about 3-17% when compared to CO_2 coolant. Application of CO_2 reduced the cutting forces and improved the surface finish of the machined part to an extent about 2-12% and 2-14% respectively when compared to the use of cryogenic LN_2 coolant. Tool wear was found to be less on the application of CO_2 compared to the wet and LN_2 machining conditions.