Research on high-precision and high-speed filtration methods for synthetic cutting fluid

Abstract During the mechanical processing of large aluminum alloy parts, deterioration of synthetic cutting fluid accelerated by foreign impurities can easily lead to the surface corrosion phenomenon of aluminum alloy parts, affecting the surface quality of the parts. This work analyzed the improvement of synthetic cutting fluid performance under high-precision filtration by using a silicon carbide filter with 100 nm precision. After high-precision filtration, the residual rate of solid impurities in the synthetic cutting fluid was 0.09%, the residual rate of oil impurities was 4%, and the residual rate of microbial impurities was less than 1%. Besides, the main ingredients of synthetic cutting fluid were retained, and the corrosion inhibition performance of synthetic cutting fluid was restored from level D to level B, which satisfied the mechanical processing requirements of large aluminum alloy parts. Based on this, a filtration system that simultaneously achieved high precision and high speed was designed, with a filtration precision of 100 nm and a filtration speed of 5 t/h. This work provides theoretical support and design guidance for high-precision and high-speed purification methods and the reuse of fully synthetic cutting fluid.