Machining Simulation And Experimental Study Of Functional Materials Based On Cavitation Effect

With the continuous development of the core industries such as optoelectronics technology,functional materials are the basic materials of these industries,and their surface quality requirements are getting higher and higher.However,the traditional surface processing methods are likely to cause sub-surface damages and surface defects,and difficult to obtain higher surface quality.Therefore,domestic and foreign experts and scholars have sought new processing principles and methods.Based on the cavitation effect,this paper explores an exploratory research on the processing of functional materials,so as to develop a high-quality,green and environmentally friendly processing method to achieve higher surface quality requirements.The specific work is as follows:(1)Theoretical study: Based on the characteristics of the cavitation chamber and the flow characteristics of the cavitation flow field,it is proposed that the cavitation chamber of the self-vibration type and the venturi tube type are connected in series.The cavitation dynamics equation,the jet structure and the numerical model are analyzed,so as to establish the theoretical basis for the numerical research and analysis.(2)Numerical study: Mixture multiphase flow model,k-? turbulence model and Singhl cavitation model are used to optimize the fluid domain model of various tandem cavitation chambers.The volume fraction contour image,pressure distribution contour image and velocity distribution contour image and so on are analyzed.The results show: the geometrical parameters of tandem cavitation chamber are obtained,that is,? is 20°,d' is 2.0mm,n is 10.5mm,? is 60°,m is 5.0mm,and d is 8.0mm.(3)Experimental platform design: Based on the theoretical study of the cavitation flow field and the numerical study of the tandem cavitation chamber,a set of experimental and full-cycle experimental processing platform is designed and built,including the structure of various nozzles design,pipeline stability and safety design and so on.(4)Experimental study:Firstly,the influence of the machining distance on the machining is discussed.At the same time,the numerical study of the cavitation chamber is verified.The relatively good tandem cavitation chamber is obtained,and its optimum spray distance for functional materials is about 8mm.Then,the effect of processing solution on the processing effect is discussed.The relatively good tandem cavitation chamber is used to explore the functional materials under the optimum distance.Characteristics of surface morphology after processing are obtained.The abrasive grains are added into the base solution.And the results show: the abrasive grains can promote the removal rate of the functional materials based on the cavitation effect to a certain extent.Removal rate increased by 59%.The abrasive grains can be used to improve the surface roughness of the functional materials,especially the local regional processing achieved good results.The study of functional materials based on cavitation effect still belongs to a new field of research.It is proposed to apply the cavitation phenomenon to the field of surface processing.The structure of the tandem cavitation chamber is designed and optimized for the subsequent cavitation chamber,so as to provide a theoretical basis for the design of the model;the water as a single processing base liquid is explored in order to find efficient high-quality,and green surface treatment of new methods,so the cavitation chamber structural design requirements are relatively high.The feasibility of surface processing of functional materials based on cavitation effect is verified by theoretical analysis,numerical research and experimental study.It is suitable for the surface removal of various difficult materials,and its application has broad prospects for development.