Vibratory stress relief equipment treatment components need to pass certain evaluation methods to characterize their aging effects, which specifically refer to the reduction and control of residual stress, the improvement of component deformation resistance and the improvement of dimensional accuracy. At this stage, the theoretical basis of vibratory stress relief equipment technology still needs to be further studied, its effect is difficult to accurately measure, and there is no unified standard. At present, the parameter curve observation method, accuracy stability detection method and residual stress measurement method have been used to evaluate the aging effect.
When the amplitude or distribution of the residual stress in the component changes, its own vibration state will change accordingly. Therefore, by measuring the change of the real-time amplitude-time curve and the amplitude-frequency curve before and after vibration during the vibratory stress relief equipment process The change of the vibratory stress relief equipment can qualitatively evaluate the effect of vibratory stress relief equipment. Vibratory stress relief equipment the possible changes in the vibration parameter curve are:
(a) The amplitude time (at) curve rises and then becomes flat or the curve rises and then falls and finally becomes flat;
(b) The amplitude frequency (af) peak value after the curve vibration rises;
(c) The peak point of the amplitude frequency (af) curve after vibration is shifted;
(d) The resonance bandwidth of the amplitude frequency (af) curve after vibration is narrowed.
When one of the four situations shown in the figure occurs, and the shape of the amplitude-frequency curve after vibratory stress relief equipment is simpler and smoother than before vibration, it can be qualitatively determined that the effect of vibratory stress relief equipment has been achieved.
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