Research On The Microstructure Performances Of High-Speed Micro Milling Machining And Superhydrophobicity Of Aluminum Alloy Surface

The regular of the precision high-speed micro-milling machining parameters on surface quality was analyzed in this paper. The precision high-speed micro-milling technology was adopted to machine the microstructure array in aluminum alloy surface with the hydrophobic or superhydrophobic properties without chemical modification. The main contents are as follows:1. Using the rational design of orthogonal experimental trials, the influence laws of surface roughness with feed rate, spindle speed, axial depth of cut, tool overhang and other factors were analyzed. Among them, the effect of spindle speed on the surface roughness was the most significant. With increasing spindle speed, the surface roughness was increased first and then decreased. Based on surface morphology analysis, the best milling parameters for subsequent machining were determined:the tool overhang L=16mm, spindle speed n=45OOOr.min-1, feed rate vf=40mm/min, axial depth of cut ap=10μm.2. The micro-pillar array structure was constructed in aluminum alloy surface by high-speed micro-milling technology, which realized the transition of surface wettability from hydrophilic to hydrophobic. The study found that the changes of surface roughness led to the transformation between noncomposite and composite wetting state.3. A method combined high-speed micro-milling with quantitative grinding process was proposed to process micro-grooves in aluminum alloy surface. The transition of surface wettability from hydrophilic to superhydrophobic was achieved. Results showed that the CAs of multi-level composite micro-groove structures came to appear the anisotropy. The superhydrophobic model was constructed in line with the kind of micro-groove structure.