Enhancing tribological performance of lead free brass in high speed micro turning via hybrid cryogenic cooling technique

Abstract

This study presents an approach to enhance the tribological performance of lead free brass in high-speed micro turning incorporating hybrid cryogenic cooling. A simultaneous flow of liquid nitrogen and vegetable oil-based MQL has been supplied to the machining interface. The performance has been compared with cutting oil-based MQL, and cryogenic cooling. Three different levels of cutting speed have been incorporated at constant feed rate and depth of cut in the machining experiments. The surface topography, microhardness, burr formation, chip formation, and tool wear have been investigated. The hybrid cooling strategy has shown steady state performance as the surface quality, burr formation, and tool wear behavior have been improved significantly. Moreover, the technique was economically and environmentally sustainable as well.