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Vibratory stress relief(VSR) is carried out by using mechanical eccentric vibration aging machine. It is the common method to remove the residual stress of the metal component, with energy saving, environmental protection, highly efficiency, low cost and other advantages. However, due to the limitation of the speed of the vibration aging machine, it can't handle the natural frequency of a high stiffness metal member with an inherent frequency of 100 HZ. Based on the analysis of the natural frequency,added mass vibration aging method is put forward for the high rigidity metal component. By attaching the mass, structural dynamic parameters of the high rigidity metal members are adjusted, and the natural frequency of them is reduced to 100 HZ. Taking a highly rigidity welding metal drum as the research object, by attaching the mass, the low order natural frequency is adjusted from 351.39HZ to 48.69HZ. The blind hole method is adopted to test before and after the vibration aging residual stress condition. The results show that after vibration ,the maximum principal stress peak value of the metal cylinder with high rigidity is decreased by 34.66% ,and its mean reduce to 69.84%. Added mass vibration aging method can effectively reduce the residual stress of the metal component with high natural frequency. |
