Multi-WEDM Process For Microarray Structure And Wettability Study

Many animal and plant surfaces in nature have excellent superhydrophobic properties.In addition to great potential for development in application,such as antifreeze and ice resistance,self-cleaning etc.,with the rapid arrival of the high-tech era,diversified process methods have made remarkable achievements in the preparation of superhydrophobic surfaces.However,some process methods have high preparation costs.The problem of inefficiency.Theoretical modeling is conducive to guiding the preparation of superhydrophobic surfaces.As a process method with wide range of Machinable parts and no mechanical stress,WEDM shows unique advantages in the structure of metal surface cutting microarrays.The MultiWEDM process shows better capability than WEDM in terms of processing efficiency.It is very promising to apply this process to the preparation of superhydrophobic surfaces.In this paper,the analysis and characterization of wettability of superhydrophobic surface and the improvement of preparation efficiency of superhydrophobic surface were studied.Firstly,a superhydrophobic surface with inclined microarray structure is studied in this paper.Based on the theoretical modeling,the mechanical method is used to analyze the droplet state on the metal surface.The influence of structural parameters on the apparent contact angle is obtained by solving simultaneous equations.On this basis,the droplet rolling state is analyzed,The relationship between contact angle hysteresis and apparent contact angle is obtained.Secondly,the inclined microarray structure was cut on the surface of aluminum alloy by WEDM,and the superhydrophobic surface was prepared and characterized by chemical treatment.The influence of structural parameters and electrical parameters on the apparent contact angle was investigated.The reason for the difference between the experimental results and the theoretical prediction model was analyzed,and the dynamic wettability of superhydrophobic surface was studied,The rolling anisotropy of the metal surface and the relationship between the structure parameters and the contact angle hysteresis were found.Finally,aiming at the problem of low efficiency of WEDM,starting from the electrode wire vibration model,the factors affecting the electrode wire jitter are obtained,and the separated wire pressing device is designed to improve the MultiWEDM device.Through experiments,it is found that the Triple-WEDM has good consistency,The machining efficiency is 2.703 times higher than that of WEDM.The apparent contact angle of superhydrophobic surface with inclined microarray structure is 152.3 °,The contact angle lag is 19.8 °.