Ultrasonic non-destructive testing method for residual stress of inner and outer roller paths of roller bearing

Abstract

The invention relates to an ultrasonic non-destructive testing method for circumferential and axial residual stresses of inner and outer roller paths of a roller bearing. Ultrasonic longitudinal waves form critical refraction longitudinal waves in the inner and outer roller paths of the roller bearing through primary waveform conversion; time spent on that the critical refraction longitudinal waves propagate in the inner and outer roller paths of the roller bearing is measured; the mean circumferential and axial residual stresses of the inner and outer roller paths of the corresponding roller bearing can be calculated according to an acoustic elasticity theory. Furthermore, the distribution of the circumferential and axial residual stresses of the inner and outer roller paths of the roller bearing under different depths further can be measured by changing the frequency of the ultrasonic longitudinal waves. With the adoption of the ultrasonic non-destructive testing method provided by the invention, the problem of rapidly, conveniently and accurately detecting the distribution of the residual stresses of the inner roller and outer roller of the roller bearing can be effectively solved. The ultrasonic non-destructive testing method is widely applied to bearing production, repairing and maintenance sites, is a novel method of detecting the distribution of the residual stresses of a curve component within a narrow space, and has a very wide application range.

Description

1. Technical field [0001] The invention relates to an ultrasonic non-destructive detection method for residual stress of inner and outer raceways of a roller bearing. The method utilizes ultrasonic critical refraction longitudinal waves to detect axial and circumferential residual stress and its distribution at a certain depth in the inner and outer ring raceways of the roller bearing. 2. Background technology [0002] During the processing or surface treatment of the bearing, due to the uneven stress field, temperature field and structural changes, the inner and outer pipes of the roller bearing retain a certain residual stress. This residual stress has a great impact on the reliability of the bearing. It has a great influence on the service life, especially on the corrosion resistance and fatigue life of the bearing. Residual stress will also lead to stress concentration and form early cracks on the bearing, which will affect the service life and safety of the bearing. , ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an ultrasonic non-destructive testing method for the circumferential and axial residual stress of the inner and outer raceways of a roller bearing, which solves the problem of rapid non-destructive batch detection of the circumferential and axial residual stress distribution of the inner and outer raceways of a roller bearing, And the method is reproducible

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