A dynamic stress adaptive vibration aging system and method

Abstract

The invention relates to the technical field of vibration ageing, in particular to a dynamic stress self-adaptive vibration ageing system and a dynamic stress self-adaptive vibration ageing method. The system consists of a processor, a signal generator, a driver, a vibration exciter, a strain gauge and a dynamic strain meter, wherein a workpiece is fixedly connected to the vibration exciter; the workpiece is supported by a supporting device; the processor controls the signal generator to output excitation frequency; the driver drives the vibration exciter after amplifying a vibration excitation signal to carry out fixed-frequency vibration ageing processing on the workpiece; the processor reads strain waveforms acquired by the dynamic strain meter by virtue of a computer interface and obtains a peak value of the strain waveforms, then, calculates additional stress sigma d acted on the workpiece; the processor calculates attenuation amount delta sigma r of residual stress every delta t; the processor substitutes sigma d+delta sigma r to calculate output voltage U delta t of the driver; and the processor automatically controls the driver in a programmed mode to set input voltage of the vibration exciter to be U delta t, so that self-adaptive regulation on additional dynamic stress acted to the workpiece is realized.

Description

technical field [0001] The invention relates to the technical field of vibration aging, in particular to a dynamic stress adaptive vibration aging system and method. Background technique [0002] Vibration aging technology is a widely used residual stress elimination method in the field of mechanical engineering, that is, when a mechanical vibration load is applied to the workpiece, when the sum of the residual stress and the additional dynamic stress inside the workpiece exceeds the yield limit of the material, plasticity will occur inside the material Deformation, so that the residual stress inside the material can be released. [0003] When the vibration aging treatment is performed on the workpiece, the internal residual stress is constantly relaxing, that is, the residual stress inside the workpiece is continuously reduced with the vibration aging treatment; the existing vibration aging process, for the The additional dynamic stress is constant, that is, the additional...

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Problems solved by technology

[0003] When the vibration aging treatment is performed on the workpiece, the internal residual stress is constantly relaxing, that is, the residual stress inside the workpiece is continuously reduced with the vibration aging treatment; the existing vibration aging process, for the The additional dynamic stress is constant, that is, the additional dynamic stress acting on the workpiece at the initial moment of vibration aging treatment, which will inevitably lead to the continuous reduction of the sum of the internal residual stress and the additional dynamic stress of the workpiece. When the sum of the two is less than the yield of the material At the limit, the residual stress inside the material will no longer relax. Therefore, in order to improve the effect of vibration aging to eliminate residual stress, it is necessary to dynamically adjust the additional dynamic stress acting on the workpiece during vibration aging treatment.

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