Tool wear and hole quality evaluation in cryogenic Drilling of Inconel 718 superalloy

In this paper, the research effforts have been made to discover the potential of cryogenic machining as a sustainable manufacturing process for drilling of Inconel 718 superalloy. The drilling performance is investigated in terms of thrust force, torque, tool wear, chip morphology and hole quality (circularity -CIR, cylindricity -CYL, and surface roughness - R-a values). The experimental result shows temperature-dependent tool wear drastically reduced under cryogenic drilling as compared to dry drilling, and this leads to a reduction in torque values up to 30%. Furthermore, the cryogenic drilling improves tool life up to 87.50% and produce better quality holes due to a decrease in CIR deviations (up to 51%), CYL deviations (up to 77%), and R-a values (up to 48%).