Experimental Evaluation of the Lubrication Performance of Milling Al7075 with Different Nano-fluids MQL

Abstract The addition of nano-fluids with different nano-particles into the biodegradable vegetable oil base has an effect on the wetting contact angle of Al7075, the cutting force and the lubrication performance, and the surface morphology of the workpiece and chip. In Milling Al7075, the lubrication performance of six different nano-fluids was evaluated. In this paper, the contact angle, cutting force and SEM morphology of aircraft Al7075 were evaluated under the lubrication conditions of Al2O3, MoS2, SiO2, CNTs, SiC and Graphite. The experimental results show that the cutting force in x direction of milling under so 2 nano-fluid lubrication is obviously smaller than that under so 2 nano-fluid lubrication. The cutting force in x direction under Al2O3 nano-fluid lubrication is 109.6% larger than that under so 2 nano-fluid lubrication, the cutting force of other nano-fluids in x direction is 2%-5% higher than that of Al2O3 nano-fluids in x direction. The rolling of SO2 spherical micro-particles can reduce the wear and the cutting force, improve the surface quality. The results show that the SO2 nano-fluid has good lubrication and wear-reducing performance.