Experimental studies on the effect of LN2 cooling on the machining of tool steel

Abstract

Cryogenic coolants as cutting fluids are gaining significance as they are eco-friendly, recyclable and moreover they do no longer produce any dangerous effect on the operators. Cryogenic liquid nitrogen at −196 °C has commonly used coolant in cryogenic machining industries. This experimental work was performed by milling action of AISI D2 tool steel tool wherein the lubrication effect caused due to cryogenic coolant (LN2) sprayed as a cutting fluid in comparison to the less moist (Dry) and moist (wet) metal removing operations based on tear and wear of tool and roughness of the surface on the machined component. Experiments have accomplished the usage of TiN coated tungsten carbide tool which has different speed combinations and feed rate combinations. The workpiece roughness of the surface was minimized up to 15–28% for dry metal removing as well as 26–38% over moist metal removing. This is because of LN2 machining offers higher lubrication and cooling effect was the minimization in the temperature behind cutting.