EFFECTS OF Al2O3 NANOCONCENTRATION AND CUTTING CONDITION ON SURFACE ROUGHNESS IN MQCL HARD MILLING OF HARDOX 500

Abstract

This study presents the work on effects of MQCL using Al₂O₃ rice oil-based nanofluid on hard milling of Hardox 500 steel. The hard milling performance of Hardox 500 steel, one of the difficult-to-cut materials, is improved. The Box-Behnken experimental design is applied to point out that nanoconcentration, cutting speed and feed rate have strong influences on surface roughness R_a. The obtained results indicate that the optimized value of surface roughness is 0.0822 µm at Al₂O₃ nanoconcentration of 0.7626 %, cutting speed of 80 m/min and feed rate of 0.08 mm/tooth. Moreover, Al₂O₃ rice oil-based nanofluid is successfully applied for hard milling of Hardox 500 steel  that is a step toward environmentally friendly machining.