全自动铲稍机砂轮主轴动态特性测试与分析

成都学院硕士学位论文格式规范Abstract:MK9524 automatic scraper is a special machine tool for processing taps.Itsdynamic performance has an inseparable impact on the processing accuracy of taps.As one ofthe core parts of the automatic shovel machine,the vibration of the grinding wheel spindlesystem is also one of the main sources of machine vibration.If the spindle vibrates greatly inthe grinding process,it will cause severe wear and even rupture of the grinding wheel,seriously reduce the grinding accuracy and surface quality of the workpiece,and shorten thegrinding machine.It is necessary to test and analyze the dynamic characteristics of thegrinding wheel spindle system because it has good vibration resistance and can meet therequirements of stiffness,strength and machining accuracy.In this paper,the dynamic characteristics of grinding wheel spindle system are studied withthe aim of improving the performance of grinding wheel spindle system,combining the finiteelement simulation analysis,the establishment of spindle mathematical model and spindle test.The main research work is as follows:(1)According to the actual working conditions and structural parameters of the grindingwheel spindle of the shovel,the three-dimensional model of the grinding wheel spindle isestablished by using solidworks.The static characteristics of grinding wheel spindle areanalyzed by ANSYS Workbench software,and the static stiffness of grinding wheel spindle iscalculated by radial deformation of spindle tail end.(2)The three-dimensional solid model of the grinding wheel spindle is imported into ANSYSWorkbench software,and the modal analysis is carried out to obtain the natural frequenciesand corresponding vibration modes of the spindle,and the critical speed of the grinding wheelspindle corresponding to each order of frequency is obtained;the harmonic response analysisis carried out to take the maximum discovered cutting force of the grinding wheel spindle asthe grinding wheel.The exciting force of the spindle is solved by setting the solutionfrequency,and the displacement frequency response diagram of the front,middle and tail ofthe grinding wheel spindle is obtained.(3)The elastic dynamic model of the grinding wheel spindle of a scraper is established.According to the principle of mechanical vibration,the grinding wheel spindle model issimplified to a simply supported beam model.(4)The natural frequencies of the grinding wheel and the spindle system are tested by theexperimental modal testing system.The results are compared with the finite element analysisresults to verify the accuracy of the finite element simulation.It provides data andoptimization direction for structural parameters optimization design of grinding wheel spindlesystem.Key words:Grinding wheel spindle;Dynamic characteristics;Finite element analysis;Modalanalysis;Harmonic response analysis2