Experimental Research Of Sapphire ELID Grinding Process

With the development of science and technology,more and more high-strength and high hardness materials are used in various fields.Sapphire is famous for its high hardness and high brittleness.Sapphire has excellent optical,mechanical and physical properties,which can be maintained even when processed at high temperature.Because of these characteristics,sapphire is widely used in aerospace,optics,electronics and other industrial fields.Sapphire has high hardness,high brittleness and difficult processing.When machining ceramics,in order to provide high quality surface,precision grinding is preferable to traditional grinding.In addition,most of the grinding process is followed by the grinding process,and the elimination of grinding process can be completed by many technologies,one of which is the use of on-line electrolytic finishing technology(ELID).ELID grinding technology will reduce the processing time,and then reduce the processing cost.In the process of grinding,due to the electrolytic effect,a layer of flexible oxide film will be formed on the surface of the grinding wheel to improve the grinding effect.This paper mainly analyzes the influence of electrolytic conditions on oxide film forming factors in the pre sharpening process,analyzes and optimizes the processing parameters in the grinding process,and analyzes the grinding characteristics of sapphire A-plane and C-plane through ELID grinding experiments.The specific research work is as follows:1.Through the analysis of the electrolysis process,the mathematical model of film forming factors and time of oxide film is established,the factors influencing the performance of oxide film are derived,the orthogonal experiment of electrolysis factors is designed,and the optimal electrolysis parameters of the pre sharpening process are obtained by analyzing and considering the pre sharpening time,thickness of oxide film,adhesion and porosity.2.On the basis of the optimized results of the pre sharpening experiment,the sapphire ELID grinding experiment is carried out.Through the range analysis of the surface roughness,grinding force and surface crushing rate of each electrolytic grinding experimental group after grinding,the influence trend and the obvious effect are analyzed.Through the comparative analysis of the surface morphology and sub surface damage after grinding,the optimized The roughness value is Ra0.069 μm.3.In view of the special structure of sapphire,ELID grinding and common grinding are carried out on the A-side and C-side of sapphire respectively.The grinding force,surface roughness,surface crushing rate and sub surface damage of sapphire are detected.Thedifferences between ELID grinding and common grinding are compared,and the grinding characteristics of sapphire A-plane and C-plane are analyzed.