| Dynamic Vibration Absorber(DVA)is one of the most commonly used and effective vibration reduction methods in the field of vibration control.Especially in the field of mechanical processing,when the machine is running at high speed,various vibration problems will always be caused by external excitation,uneven surface of the workpiece,aging and loosening of various parts of the machine.Therefore,the design and experimental research of dynamic vibration absorber have important theoretical and application value to improve the vibration problem in machining process.The high precision,high speed,high efficiency and low cost of wheel hub processing machine,as well as the quality requirements of the processed wheel hub,is the most important thing in the machining process.The existing wheel hub processing machine has the problem of uneven surface and low machining precision caused by excessive spindle vibration during machining.This dissertation on the basis of kinetics by modeling,simulation and calculation,material and structure design,processing,measurement and experimental method,design a vibration absorber to improve the spindle vibration problem,and set up corresponding experiment platform,used to test the vibration of dynamic vibration absorber which is used to design the effect.This dissertation first according to the hub machining machine spindle structure,size and speed of the actual characteristics,and then further combined with the vibration test results to know the machine spindle mode and vibration frequency,to clarify the design of the dynamic vibration absorber modal characteristics.On this basis,the material and structure composition of the dynamic vibration absorber were investigated,analyzed and optimized.Finally,ANSYS Workbench software was used to mesh the physical model of the dynamic vibration absorber and solve its first six modes and natural frequencies.After continuous optimization,the final size parameters and mass size were determined.The experimental device platform is designed on the basis of the completed dynamic vibration absorber,and finite element simulation and numerical calculation are carried out for its modal characteristics and response under the action of simple harmonic excitation,so as to analyze the rationality and stability of the experimental device design.The experimental device platform is to test the vibration reduction effect of the designed vibration absorber by simulating the vibration condition of the spindle of the hub machining machine tool when it is working.After collecting,processing,analyzing and comparing the vibration acceleration signals before and after the installation of the dynamic vibration absorber,the conclusion is drawn.The experimental results show that the vibration acceleration of the experimental device with the absorber within the designed frequency range is more than 60% lower than that before,which verifies the effectiveness of the experimental study in this dissertation.Through the accumulation of work in the research stage of the dissertation,the corresponding dynamic vibration absorber and experimental device platform are designed,and the theoretical model and measured data within the design frequency range are verified,and the effect is significant.It is of great significance to the vibration suppression of machine tools and the application and development of dynamic vibration absorber in practical engineering cases. |
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