Iranian Nanotechnology Society International Journal of Nanoscience and Nanotechnology 1735-7004 20 4 2024 12 15 Influences of Al2O3 Nanofluid MQL Technological Parameters on Thrust Cutting Force in Hard Turning Using CBN Inserts 275 284 729085 10.22034/ijnn.2025.2040600.2564 EN Vu Lai Hoang Department of Materials Engineering, Faculty of Mechanical Engineering, Thai Nguyen University of Technology, Thai Nguyen 250000, Vietnam Tran Bao Ngoc Department of Fluids Mechanic, Faculty of Automotive and Power Machinery Engineering, Thai Nguyen University of Technology, Thai Nguyen 250000, Vietnam Tran Minh Duc Department of Manufacturing Engineering, Faculty of Mechanical Engineering, Thai Nguyen University of Technology, Thai Nguyen 250000, Vietnam 0000-0002-9188-7553 Ngo Minh Tuan Department of Manufacturing Engineering, Faculty of Mechanical Engineering, Thai Nguyen University of Technology, Thai Nguyen 250000, Vietnam 0000-0002-5117-7741 Tran The Long Department of Manufacturing Engineering, Faculty of Mechanical Engineering, Thai Nguyen University of Technology, Thai Nguyen 250000, Vietnam 0000-0002-5333-8705 Journal Article 2024 09 08 High cutting forces generated from contact faces in hard turning process are still the huge challenge, which limits the productivity, lowers machined surface quality, and shortens tool life. Among them, the thrust cutting force strongly affects the hard cutting efficiency. This study aims to analyze the thrust force in turning process of hardened 90CrSi steel under Al2O3 Nanofluid Minimum Quantity Lubrication (NF MQL) technology using uncoated cubic boron nitride (CBN) inserts. Regression analysis was made to establish the dependence of the thrust force on NF MQL parameters. The results indicate that air pressure has the most significant influence on the thrust forces. The interactions between nanoparticle concentration and air flow rate (NC*Q) and between air pressure and air flow rate (p*Q) also showed the significant effects. The minimal value of thrust cutting force (Fy) could be achieved at Al2O3 nanoparticle concentration of 0.8%, air pressure of 4 bar, and air flow rate of 250 l/min. Moreover, the analysis results could be used to determine the reasonable set of NF MQL parameters for smaller Fy values in hard turning process. https://www.ijnnonline.net/article_729085_5ff1e6fafafe850aeec2afd714c417e2.pdf