轴承套圈周向裂纹漏磁信号一致性提升方法

Method for Improving Consistency of Magnetic Flux Leakage Signals of Circumferential Cracks of Bearing Rings

针对轴承套圈滚道面不同曲率半径处周向裂纹漏磁信号存在不一致,影响套圈漏磁检测结果判别的问题,采用有限元仿真分析套圈滚道面曲率半径对套圈内部磁场分布和周向裂纹漏磁信号的影响规律,结果表明漏磁信号随曲率半径的不断增大而增大,基线信号也存在偏移。为降低曲率半径对磁化效果的影响,提出局部磁化方式,优化磁化器结构参数,并提出一种基于表面曲率半径特征参数的信号补偿方法,将套圈裂纹漏磁信号幅值的相对改变量从93.37%降低至9.8%,显著提高了轴承套圈裂纹漏磁信号的一致性。

Aimed at the problem that the magnetic flux leakage signals of circumferential cracks at different curvature radii of bearing ring raceway surfaces are inconsistent,which affects the judgment of magnetic flux leakage detection results of rings,the influence law of curvature radii of ring raceway surfaces on magnetic field distribution inside rings and magnetic flux leakage signals of circumferential cracks is analyzed by finite element simulation.The results show that the magnetic flux leakage signals increase with the continuous increase of curvature radii,and the baseline signals also have a deviation.In order to reduce the influence of curvature radii on magnetization effect,a local magnetization method is proposed to optimize the structural parameters of magnetizer,and a signal compensation method is proposed based on characteristic parameters of surface curvature radii,which reduces the relative change of amplitudes of magnetic flux leakage signals of ring cracks from 93.37%to 9.8%,significantly improving the consistency of magnetic flux leakage signals of ring cracks.