在高交变接触应力下长期使用的轴承零件,要求具有高的耐磨性,高的接触疲劳寿命等优良性能。轴承零件内部或表面,即使存在极微小的缺陷,也会在交变应力作用下发展、扩大。因而轴承零件的质量除了靠材料和一系列的冷、热加工过程保证外,无损检验是不可缺少的。目前应用磁力探伤方法检验轴承环的轴向裂纹它具有很高的灵敏度。应用超声表面波检验轴承环的纵、横向裂纹也较方便。但对于影响轴承寿命的内部缺陷,即使采用灵敏度调整到1%的X-射线探伤,仍然不能满足轴承零件的检测要求。对于球形零件内部缺陷的高效检测方法,更为少见。部分轴承环的内部缺陷,虽可应用一般的超声方法进行探测,但因大部分中型轴承环尺寸小,环壁薄,几何截面复杂,一次声程小,超声束在复杂的几何截面会引起复杂反射,非但细微缺陷的探测困难,而且 Long-term use of bearing components under high alternating contact stress requires high performance such as high wear resistance, high contact fatigue life, and the like. Bearing parts within or on the surface, even if there are very small defects, but also under the action of alternating stress to develop and expand. Therefore, in addition to bearing the quality of parts and materials by a series of cold and hot processing to ensure that non-destructive testing is indispensable. At present, the application of magnetic detection method to check the bearing ring axial crack it has a high sensitivity. Application of ultrasonic surface wave test bearing ring longitudinal and transverse cracks more convenient. But for the internal defects that affect the bearing life, even with the sensitivity adjusted to 1% X-ray inspection, still can not meet the testing requirements of bearing parts. For the spherical parts of the internal defects of efficient detection methods, even more rare. Some bearing rings of internal defects, although the ultrasonic method can be used to detect the general, but most of the medium-sized bearing ring small size, thin ring wall, geometric cross-section complex, a small acoustic path, ultrasound beam in complex geometric cross-section will cause complex Reflection, not only the detection of minor defects difficult, but also