Dynamic Characteristics Analysis And Optimization Design Of Key Parts Of MKS1320 CNC Cylindrical Grinder

As an important finishing process,high-speed grinding has attracted attention due to its advantages of high processing quality and high processing efficiency.Grinding machines continue to develop in the direction of high speed,high automation and high precision,and increasingly high requirements are placed on the static characteristics and dynamic performance of the grinding machines.The bed and the grinding wheel spindle are the two most critical parts of the grinding machine,and its dynamic characteristics have an important influence on the dynamic performance of the entire grinding machine.This paper takes the bed and grinding wheel spindle of MKS1320 high-speed CNC cylindrical grinding machine as the research object,and aims to improve the static and dynamic characteristics of the bed,the spindle and the machining performance of the grinder.The method of finite element software ANSYS simulation analysis and experimental verification was used to perform static dynamic analysis and structural parameter optimization design of the external grinder bed and spindle.This article mainly completes the following work:1)According to the actual structure size of the MKS 1320 CNC cylindrical grinding machine to establish a 3D solid model of bed and spindle,make appropriate simplification,and determine the constraints and external loads,to generate an accurate finite element model in ANSYS Workbench.2)ANSYS Workbench was used to analyze the statics of the bed,and the deformation and stress cloud diagram of the bed were obtained.The modal analysis of the bed is performed to obtain the first six natural frequencies and the corresponding mode shapes.Then,the critical rotational speed of the bed is obtained,and the displacement frequency curve of the bed system is obtained from the harmonic response analysis.3)The LMS vibration test system was built to perform experimental modal analysis on the bed,and the response of the measurement points was obtained by the LMS multi-channel data acquisition system.The modal analysis software LMS Test.Lab14A was used to identify the modal parameters,The results of experimental modal and finite element analysis are compared to verify the rationality of bed finite element modeling and analysis and provide theoretical basis for optimization design of bed.4)Based on the research results of the dynamic characteristics of the bed,the optimized design module of the Workbench was used to optimize the design of the structural parameters of the bed,and the static and dynamic performance of the bed was improved to a certain degree on the basis of light weight.5)The equivalent method of bearing stiffness is studied.The static analysis of the grinding wheel spindle is performed to obtain the deformation of the the spindle under the external load.The stiffness value is calculated and the influence of the change of bearing stiffness on the stiffness of the spindle is investigated.The six-order natural frequency and mode shape of the spindle are obtained through dynamic analysis.Conduct a harmonic response analysis to explore the resonance range of the spindle and verify the rationality of the spindle design.6)Based on the spindle parameterized model,with the spindle's front overhang amount,front taper size,bearing span,and mid-spindle's middle diameter as four design variables,Optimize the size of the spindle,The static stiffness and low-order natural frequency of the main shaft have been significantly improved after optimization,so that the static and dynamic performance of the main shaft is improved.