In this experimental study, the cutting performance of solid carbide twist drill with wet and cryogenic cooling (LN2) was analysed for super duplex stainless steel 2507 (SDSS 2507). The drilling test was conducted at three different levels of cutting velocity (40, 50 and 60 m/min), feed rate (0.03, 0.05, 0.07 mm/rev) and constant drilling depth of 20 mm. The output response of cutting forces, torque, surface roughness, temperature, microhardness and tool wear was observed on both the condition while drilling super duplex stainless steel (2507). The experimental result reveals that the cryogenic coolant (LN2) reduces the cutting temperature for about 27.66–55.74% than wet cooling condition. With increased feed rate the thrust force and torque increases and related to increase in the cutting velocity the thrust force and torque reduced for both wet and cryogenic (LN2) conditions. The surface finish of the drilled hole was enhanced in cryogenic condition against wet condition. The minimum amount of flank wear was observed in the cryogenic condition through a scanning electron microscope (SEM).

No abstract

Recently Cryogenic cooling has witnessed a significant role in improving efficiency, increasing the quality of machined parts, and developing a techno-economic and eco-friendly acceptable methodology in the machining of components. This study deals with the effect of hardened AISI 4340 steel at 48 HRC against uncoated WC cutting tool analyzed through use of dry, cryogenic liquid nitrogen (Cryo-LN2) and cryogenic liquid carbon dioxide (Cryo-LCO2) cooling environments. The input parameters for this hard turning condition include cutting velocity, feed rate, and depth of cut. A study of the machining performance of cutting temperature, surface roughness, material side flow, flank wear, microhardness, and chips morphology has also been made. The experiment results revealed the effective lowering of the cutting temperature, better surface roughness and reduces flank wear for LCO2 and LN2 coolant by cryogenic cooling against dry cutting condition. Compared to dry and cryogenic LCO2 cutting environments, the machined zone of a cryogenic LN2 exhibited the highest microhardness value. The main reason for this was the decrease in the thermal softening effect. Overall, the performance of the cryogenic LN2 environment condition was effective and efficient in the turning process compared to dry and cryogenic LCO2.

No abstract