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(一)前言 轴承零件的裂纹是质量标准中所不允许的,就其影响来说,微小的裂纹也会引起轴承过早损坏,严重者将导致事故的发生,因此对于裂纹的检查,是一项非常重要的工作。 裂纹的种类很多,常见的有材料裂纹、锻造裂纹、冲压裂纹、淬火裂纹与研磨裂纹等。通常,对于裂纹的检查除了用内眼或借助于放大镜检查可见裂纹外,有磁力探伤、超声波探伤、油浸喷砂探伤、萤光探伤、射线探伤几种。对于表面裂纹而一般多采用磁力探伤法,它可以用来发现肉眼或借助放大镜都不易看到的细小裂纹,以及甚至埋藏在离表面1.5～2毫米处的缺陷。
(A) Preface Bearing parts of the crack is not allowed in the quality standards, its impact, the tiny cracks can cause premature bearing damage, in serious cases will lead to the accident, so check for cracks is a Very important job. Many types of cracks, common material cracks, forging cracks, stamping cracks, quenching cracks and grinding cracks. In general, there are magnetic flaw detection, ultrasonic flaw detection, oil immersion sandblasting flaw detection, fluorescent flaw detection and radiographic flaw detection in addition to the inspection of cracks by means of the inner or the magnifying glass. For surface cracks and the general use of magnetic detection method, it can be used to find the naked eye or with a magnifying glass are not easy to see the small cracks, and even buried 1.5 to 2 mm away from the surface defects.