Abstract: This study focuses on the analysis and optimization of technology parameters for the Nanofluid Minimum Quantity Lubricationmethod in the hard turning of 90CrSi steel. The effects of Al₂O₃ nanoparticle concentration (NC), air pressure (p) and air flow rate (Q) on the active cutting force (Fa), passive cutting force (Fp), and specific cutting force (Pc−c) were analyzed by an experimental study. The results showed that NC&p were the factors that greatly affected Fa and Pc−c. Fa and Pc−c reached small values at low concentrations and medium pressure levels (about 5.2 Bar). In contrast, Fp is strongly influenced by the interaction between factors and reached a minimum value at 4.0 Bar. Furthermorea multi-objective optimization method was used to find a compromise solution. The overall optimal parameters proposed were: NC≈0.79%, p≈4.97 Bar, and Q≈205.6 l/min. This result provides suitable technological parameters, while also improving cutting efficiency and machining accuracy in real-world manufacturing applications.

Keywords: NFMQL, hard turning, nanofluids, cutting force, lubricant, CBN, Al2O3, Optimization

Pages: 46-56