Research On Development And Processing Technology Of Magnetic Fluid Polishing Grinding Machine

In the field of high and new technology,the technology and process of ultra-precision machining are very high,and the requirements for surface quality and machining damage of components are becoming higher and higher.With the progress of national science and technology and the improvement of precision machining level,the application of optical elements(such as plane lens)is increasing day by day,which has a lot of applications in optical system,aerospace,laser fusion,large aperture telescope and so on.However,due to the high precision of precision optical components,there is still a lot of room for improvement in the ultra-precision grinding and polishing technology and its equipment.Precision polishing technology is the final process of precision machining on the surface of precision and ultra-precision components,which affects the quality of the final workpiece,the surface accuracy and the machining period of the whole workpiece.Due to machining needs,ion beam polishing,magnetorheological,CNC small grinding head,and other polishing technology has also been developed rapidly in recent years.In order to explore the polishing precision is not lower than the traditional grinding machine,but the processing object is wider and the cost is lower.Based on the traditional grinding machine,the corresponding magnetic fluid ring polishing machine is developed with magnetic fluid polishing technology,and the processing technology is studied.The main research contents are as follows:(1)The purpose and significance of this study are introduced.Several polishing techniques such as airbag polishing are summarized,and the polishing principle,advantages and disadvantages of various techniques are explained.The three techniques of magnetic field assisted polishing are compared and analyzed from the composition and processing characteristics of polishing body.Finally,the general situation and technical characteristics of grinding technology and grinding machine tool are expounded.(2)The basic conditions of this paper are introduced,including the design of magnetic fluid grinding machine tool and the selection of key components,the design of polishing head,the principle of magnetic fluid polishing,the composition and preparation of magnetic polishing body.It lays a good equipment foundation and processing foundation for subsequent experiments and theoretical research.(3)The kinematics model of polishing process is mainly established according to the magnetic fluid ring polishing machine,and the relative velocity of any point in the polishing area is solved based on the model.A NBIT force sensor is used to measure the polishing pressure,and the relationship between polishing pressure and machining speed,polishing pressure and machining gap is studied.Based on the relative motion velocity model and the radial polishing pressure distribution,the material removal at any point in the polishing area is calculated and the theoretical removal function model is established.(4)The kinematics modeling of magnetorheological ring polishing machine is carried out,the relative velocity equation of abrasive particle is solved,and the distribution of abrasive particle on grinding is simulated,and the experiment of single and triple grinding is carried out.It lays an experimental foundation and theoretical guidance for the subsequent grinding experiments.(5)The orthogonal experiment of grinding is mainly carried out,which is of guiding significance to the setting of the parameters of subsequent grinding.The influence of machining speed,processing time and processing pressure on the results of machining experiments is studied.