The lubricant analysis method uses ferrography analysis technology, which is a method particularly suitable for identifying and predicting rolling fatigue.
A part of the lubricating oil of the rolling bearing is extracted as an oil sample, and a high gradient magnetic field is used to deposit the solid foreign matter contained in the oil sample flowing through the magnetic field on a glass sheet in proportion to its size, so that the shape, size, color, and material of the foreign matter particles can be observed. , so that the type of wear can be clearly identified, the operating status of the machine can be predicted, and hidden dangers can be discovered in time. In principle, ferrography technology is mainly aimed at identifying strong magnets such as steel, but it also has excellent identification capabilities for non-ferrous metals such as copper, sand, organic matter, seal debris and other foreign matter.
When steel-like spherical particles with a diameter of 1 to 5 μm appear in the oil sample, it is certain that the bearing has begun to develop fatigue micro-cracks. When fatigue spalling particles with a length to thickness ratio of 10:1 appear in the oil sample, and the length is greater than 10 μm, abnormal fatigue wear in the bearing has begun. When the length is greater than 100 μm, the bearing has failed.
Fatigue debris is a fatigue flake with a length-to-thickness ratio of 30:1, with a length of 20 to 50 μm, and the flakes often contain cavities. At the onset of fatigue, the number of such flakes will increase significantly, which together with spherical particles can be a sign of the onset of fatigue.