Research On Software And Technology Of Laser Precision Texturing

The natural-inspired bionic texture surface has become the focus of attention in the global academic community for its functions such as anti-friction,anti-adhesion,super-hydrophobic and anti-fog,which can adjust the electromagnetic,biological and mechanical properties of the material surface.Traditional chemical and mechanical processing technologies are limited by efficiency,precision and process complexity.Ultrafast laser processing technology has become a research hotspot of precision texture processing technology due to its advantages of extremely short laser pulse action time and minimal heat-affected area.In this paper,laser precision texture modeling control software,metal surface high-precision texture processing control method,and the metal surface wettability changing rules of different texture morphologies were studied.The main contents are as follows:(1)The mechanism of the interaction between ultrafast laser and metal materials,the principle of laser precision molding technology and the mechanism of laser surface modeling wetting were studied.The temperature field model in the laser interaction with materials,the principle of laser three-dimensional precision texture modeling,and the model principle of different wettability of material surface were analyzed,which established the theoretical basis for subsequent control algorithm and process experiment research.(2)A laser precision texture modeling software based on high speed galvanometer scanning was designed.The software includes motion control module,laser and two-dimensional galvanometer control module,graphic drawing module and laser milling module.The basic algorithm of layered scanning and layer-by-layer milling were designed and implemented to meet the needs of high efficiency machining.In order to improve the quality of machining surface,the method of peak shifting was added.A variety of basic structures such as grid,square column,column and their array structures were provided,which laid a foundation for the technological research of laser precision texture modeling.(3)The precision control technology of 355nm picosecond laser milling 2024aluminum alloy was studied.The effects of laser processing parameters such as laser power,filling interval,scanning speed and scanning times on the milling morphology were studied in detail through experiments.With Z-axis moving layered processing mode,three optimal processing parameters were obtained under the condition of power P=4.83W/11.9W/21.6W,with the unit volume ratio ranging from 710J/mm~3 to 6000J/mm~3.For the milling experiment with a target depth of 100?m,the aluminum alloy sample was milled with an average power of 11.9W,a scanning speed of 840mm/s,and a filling interval of 20?m to achieve an optimum depth control result with an absolute error of 0.5?m.In the target depth range of 100?m,the surface roughness can be reduced by 35.9%on average with the same processing parameters by using the method of peak shifting,which effectively improved the surface quality of the milling.(4)The isotropic super-hydrophobic surface of groove structure and the highly adherent anisotropic super-hydrophobic surfaces of grid structure were prepared on 2024 aluminum alloy by 1064nm picosecond laser.Through the scanning electron microscope,contact angle measuring instrument and other equipment systems,the effects of different texture periods,gap width,depth,structure types and experimental conditions on the contact angle and rolling angle of the milling surface were systematically studied and analyzed.The influence law of the size of characteristic morphology on surface wetting properties lays a foundation for the application of controllable bionic texture preparation technology.