Research And Device Design Of Special Grinding Fluid For Silicon Nitride Ceramic Ball

Compared with common metal materials,engineering ceramics have the characteristics of high strength,high hardness,high brittleness,wear resistance and corrosion resistance,heat insulation,low density,low expansion coefficient and good chemical stability,and are widely used in the fields of automobiles,aerospace,chemical industry,textile,metallurgy,mining,machinery,energy and military.Silicon nitride ceramics are hard and brittle materials,which are not easy to process and have high processing cost.Silicon nitride ceramic balls are removed by grinding,so the selection of grinding fluid directly affects the processing quality and processing cost of ceramic balls.In order to produce high quality silicon nitride ceramic balls with high efficiency,this paper studies them from two aspects.1 Research on grinding fluid to reveal the influence of grinding fluid on grinding of silicon nitride ceramic balls.2 The grinding method is studied to reveal the influence of different processing methods on the processing efficiency of silicon nitride ceramic balls.Through the combination of theoretical analysis and experimental research,the material characteristics and material removal mechanism of silicon nitride are analyzed,and finally the experimental verification is carried out.The main tasks to be carried out include:1.Theoretical analysis of the composition and function of grinding fluid.The removal mechanism of materials in the grinding process is studied,and the action mechanism of grinding fluid in the grinding process of silicon nitride ceramic balls is analyzed,which lays a theoretical foundation for how to select special grinding fluid for silicon nitride ceramic balls.2.Various additives in grinding fluid were analyzed,including suspending agent,antirust agent,lubricant and dispersant.The anti-rust performance was tested.The anti-rust agent selected sodium molybdate,hexamethylenetetramine,triethanolamine and benzotriazole to make 15 kinds of solutions for the experiment.The combination of triethanolamine and sodium molybdate was finally determined to be the best.3.Then,the grinding mechanism and grinding method are analyzed,showing the influence of grinding method on the processing efficiency of ceramic balls.The grinding method of the double-rotation grinding disc with the best grinding effect issimulated,which proves that the grinding method can change the self-rotation angle of ceramic balls,thus accelerating the grinding efficiency and grinding quality.4.Design the ball grinding equipment,including calculating the main parameters such as spindle torque,selecting stepping motor that meets the working requirements,designing the spindle,carrying out stress and strain analysis on the spindle,selecting the number of springs in the spring group,and carrying out deformation and stress and strain analysis on the flange plate.5.Grinding silicon nitride ceramic balls with different proportions of silicon nitride special grinding fluid through orthogonal experiments to determine the optimal composition of the silicon nitride special grinding fluid,and carrying out experimental verification on the prepared grinding fluid,and comparing and analyzing the obtained grinding fluid with the existing grinding fluid.