Design And Research Of Special Center-less Grinder Spindle For Drying Grinding Of MOX Pellet

This topic based on Hunan University cooperated with China Nuclear Power Engineering Co.,LTD design a production line to test,select and reprocessing unqualified product about 0.01mm processing accuracy of rod pellets.processing equipment use the center-less grinding machine.on account of the special properties of this material,Liquid cooling fluid is limited and grinding waste dust cannot be leaked out.So in order to assure the regular process under special conditions,we need improve the shaft system of the original scheme in such aspects as cooling scheme of grinding,grinding sealing and so on.In terms of processing accuracy,the precision of MOX pellet size largely depends on that of center-less grinding machine.In center-less grinder shaft system,static stiffness,dynamic vibration etc is one of the most important factors to affect the machining accuracy of machine tools.This topic from the shaft dynamic and static performance analysis to optimize the shaft structure design.This topic optimize the center-less shaft structure on the respect of shaft dynamic and static performance analysis.The main idea of the topic is to combine analytic method and finite element method to research the dynamic and static characteristics of center-less grinder shaft.From comparing two different results and analyzing the reason of error,this topic puts forward an improved calculation modeling method,combined with the adaptive single target function to optimize grinding machine shaft design,mainly including:1.Based on engineering mechanics integral method to calculate the stepped shaft end deflection as the shaft static stiffness index,compared with the result get from ANSYS finite element method,this topic analyze two main source of error and puts forward a simplified method of main shaft bearing model,at the same time the shaft end deflection is regarded as boundary condition in optimizing the structure of the shaft.2.Based on vibration analysis method,when the main shaft under the condition of satisfy the machining accuracy,grinding wheel system should satisfy the unbalance to provide the basis for the selection of grinding wheel,the acceptance and repair.At the same time,according to relationship between the amount of unbalance and the ratio of main shaft frequency to inherent frequency,this topic get the reasonable scope about shaft inherent frequency and take it as shaft structure optimization of boundary conditions.3.According to Hertz theory and related literature,the relationship between the stiffness and the supporting force of the shaft contact bearing in the spindle is obtained,and the bearing is equivalent to the spring according to the relevant literature,then the finite element analysis model of the spindle is established.4.Using ANSYS and ANSYS DE design optimization module.According to the static and dynamic characteristics of the shaft,the single target adaptive function is used to optimize the spindle so that the shaft can reduce the spindle volume while satisfying the static and dynamic performance.