Optimization Of High Efficiency Batch Processing Technology For Silicon Nitride Ceramic Spheres

Ceramic bearings have excellent mechanical properties,can meet the performance requirements of precision equipment,and are widely used in industrial production,but at present,we still can not mass-produce ceramic balls with high precision and high consistency,which limits the development of ceramic bearings.According to the ceramic ball processing method,based on the variable curvature groove grinding method,a variable diameter concentric multi-groove processing method is proposed.By increasing the number of grinding grooves,the batch output of the ball is increased,this thesis will study the processing method.The geometric motion model of a single sphere was established through theoretical analysis,and the key parts of the ball grinding machine were analyzed and designed,the processing parameters were optimized based on the response surface optimization method,and the optimal parameter combination of grinding was obtained.The main contents of this thesis include:(1)The production process of rough silicon blank ball and some relatively mature production technology in China are introduced.The processing technology of silicon hydrogenated ceramic ball is analyzed and studied,and the processing accuracy of silicon hydrogenated ceramic ball is improved from the preparation of blank ball.(2)Introduced the eccentric reducer concentric more groove processing,the basic principle of the velocity vector analysis method is used in establishing single star sphere under ideal state on the single spiral trajectory lime geometry motion model,through the Matlab simulation software of single ball trajectory simulation,the results show that the grinding trajectory of the machining method can cover any point on the surface of the sphere,and the uniform grinding of the sphere can be realized in a single cycle.(3)Through modern innovative design technology,analyze the structural characteristics of the pressure mechanism,design the pressure plate structure,optimize the pressure mechanism,the 3D model of the press plate was established by Solidworks3 D modeling software,import the Ansys Workbench module for static analysis and modal analysis of the pressure plate model,and optimize its key structural parameters.The optimized results show that when the eccentricity is 17 mm and the distance from the goal notch to the center of the pressure plate is 65 mm,the uniform pressure of the pressure plate can be better realized,and the processing quality of the ball grinding machine can be improved.(4)Based on eccentric reducer concentric groove processing equipment processing for hydrogenated silicon ceramic ball object,take material removal rate,surface roughness and spherical error as evaluation indexes,using the software Design-expert design experiment processing parameters were optimized by response surface method to implement the grinding pressure,grinding speed and grinding fluid concentration of the optimal set close.Experimental results show that the surface roughness of the machined sphere reaches 13 nm under the optimal parameters.The spherical error is 0.12μm,which is up to the standard of G5 sphere.It is proved that the method of concentric multi-groove machining with variable diameter is feasible and the process parameters are optimized by response surface optimization method,which has guiding significance for the machining and parameter optimization of ceramic ball.