The Static And Dynamic Analysis Of The Key Components In Spindle System Of NC Milling Machine And Its Optimization

In the manufacturing industry continues to develop today,the precision machining requirements are increasingly high,as the "machine tool industry," the machining accuracy is also rising.With the gradual change of the machine tool to the numerical control and intelligence,the static and dynamic performance of the machine tool spindle has a direct impact on the machining accuracy,so it is very important to carry out the static and dynamic analysis and performance check of the key components of the machine tool.In this paper,a numerical control milling machine for the study of the object,through the development of finite element software based on the parametric modeling of key components of the spindle dynamic and static characteristics of the analysis and optimization design.The main research works are as follows:(1)Using the three-dimensional software UG,according to the relationship between the various components on the two-dimensional CAD drawing,the size of each component is obtained,and assembled according to the assembly relation,and the digital modeling based on UG is obtained.Machine tool three-dimensional model of the establishment of the overall grasp of the working principle of machine tools and basic performance for the future of the spindle components of dynamic and static analysis and optimization of design lay the foundation.(2)Using the finite element analysis method,the stiffness of the spindle bearing is analyzed.In the classical ANSYS 14.0,the three-dimensional model of the bearing is established.The contact element is selected by the contact analysis theory,and the cosine load is applied to the inner diameter of the bearing to simulate the real constraint.The bearing stiffness is calculated by the displacement diagram of the stress cloud.(3)To analyze the static stiffness of the spindle,the concrete steps are as follows:Firstly,the three-dimensional finite element model of the spindle is set up,the bearing constraint is simulated by the spring damping system(COMBIN14),the bearing quality is simulated by the mass element(MASS21),and the static system The displacement and the stress cloud of the spindle are obtained,and the static stiffness of the spindle is calculated.(4)Analysis of the dynamic characteristics of the spindle,the first modal analysis,the spindle is the first ten natural frequency,and to calculate the critical speed of the spindle.Then the harmonic response analysis was carried out to obtain the displacement-frequency curve of the key parts.After the static and dynamic analysis,from the analysis results to find deficiencies in order to get the spindle performance optimization goals,the use of ANSYS command flow(APDL)parametric design language,the choice of software comes with optimization tools to complete the optimization of the spindle,So that static and dynamic performance of the spindle.