High-frequency Vibration Aging Mechanism And Experimental Research For Low-rigidity Small And Medium-sized Workpieces

At present,the research on VSR at home and abroad mainly focuses on the traditional lowfrequency VSR whose frequency is less than 200 Hz,while the research on high-frequency VSR technology is less.Low frequency vibration stress relief is mainly applied to large-scale equipment and workpieces.For some small and medium-sized complex thin-walled structures,its natural frequency is very high.When the first resonance frequency of components exceeds the frequency range of low frequency vibrators,effective vibration stress relief treatment of components can not be carried out,and there is no uniform standard for the selection of vibration stress relief process parameters.Aiming at small and medium-sized workpieces with high natural frequencies such as rotating frames,the mechanism and experimental study of high frequency vibration aging technology are carried out.Firstly,based on lattice dynamics,a multi-degree-of-freedom damped vibration system of material particles is established,and the mechanism of high frequency vibration aging is studied and analyzed.Secondly,based on the finite element software Abaqus,the numerical simulation analysis of high frequency vibration stress relief for rotating frame workpiece is carried out.The modal analysis technology and the harmonic response analysis technology are put forward.The important technological parameters such as excitation force,frequency and point are determined.The simulation results are analyzed and the advantages of high frequency vibration stress relief for small and medium-sized workpieces are verified.After that,the feasibility of Ultrasound Vibration Stress Relief(UVSR)is analyzed and discussed.According to half-wavelength theory and finite element simulation analysis,the UVSR system with 20 kHz resonant frequency is designed and manufactured.Finally,combined with the results of theoretical analysis and finite element simulation analysis,the experiments of high-frequency vibration aging and Thermal-Vibration compound aging of rotating frames and the experiment of ultrasonic vibration aging of half-wavelength samples were carried out,which effectively eliminated the residual stress in the workpiece material,and showed the effectiveness of high-frequency vibration stress relief technology in eliminating the residual stress of small and medium-sized workpieces.