Hard Turning Performance Investigation of AISI D2 Steel under a Dual Nozzle MQL Environment

In recent years, hard turning has emerged as a burgeoning cutting technology for producing high-quality finishing of cylindrical-shaped hardened steel variety industrial applications. Hard under dry was not accepted because the generation higher temperatures which accelerated tool wear and produced an inferior surface finish. Nowadays, minimum quantity lubrication (MQL) is widely in to reduce problems encountered cutting. This research aimed augment MQL performance process AISI D2 by applying novel concept, namely, dual jet nozzle system that supplies fluid into zone from two different directions. The performances are discussed using machinability indicator parameters, such roughness, wear, temperature, power consumption, noise emission, chip morphology. greatly reduced friction between contact surfaces provided improved quality (Ra = 0.448 1.265 µm). Furthermore, flank found be lower, range 0.041 0.112 mm, with abrasion adhesion being observed main mode mechanisms. consumption influenced depth cut (46.69%), followed speed (40.76%) feed (9.70%). shapes were helical, ribbon, spiral c type, while colors metallic, light blue, deep golden.