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The Effect of Bearing Residual Magnetism on Service Life
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| Time：2016.11.10 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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Residual magnetic generation is mainly bearing parts in the processing process, by a variety of electrical equipment and fixture clamping and positioning of the impact, inevitably be magnetized and have a strong magnetic. Due to the presence of such magnetic, bearing parts in the processing process (grinding, lapping) produced by the fine metal powder is adsorbed on the bearing channel and the rolling body, easy to clean off. Bearing in use, residual in the bearing channel or raceway in the fine metal powder on the bearing noise, vibration, rotation accuracy and service life of a greater impact, leading to bearing high temperature, early damage.
Work surface burns mainly in the grinding of the bearing, the outer ring raceway and raceway, the feed is too large, not enough cooling or grinding wheel is not timely grinding in the processing surface are likely to produce high temperature, so that local annealing Resulting in burns. Bearing the work surface burns have a direct impact on the service life of bearings, bearings in the work on the one hand to guide the rotation, while under a greater load, the bearing parts of the work surface burns, hardness decreases, resulting in channel or raceway surface fatigue early spalling, Greatly reducing the bearing life.
The basic dynamic load rating C is used to calculate the bearing under dynamic stress, that is, the bearing that rotates under load. The expression of the ISO 281: 1990 to achieve the basic rated life of 1000000 rpm bearing load. The magnitude and direction of the load are assumed to be constant. For radial bearings, the load is a pure radial load, for thrust bearings, is acting on the axial load bearing center.
Rolling bearing life is defined as the number of revolutions a bearing can achieve before the first occurrence of signs of metal fatigue (peeling or breaking) on one of the bearing rings or rolling elements.
Practice has proved that the surface of the same bearing in the same working conditions, will still reach a different life. Therefore, in the calculation of bearing size, the term "life" must be more clearly defined. The general information provided on the basic dynamic load rating is based on a sufficiently large number of surfaces bearing exactly the same bearing, with 90% being able to exceed the service life as a basis.
There are several different definitions of bearing life. One of these is "working life", which indicates the actual life of the bearing under actual operating conditions before the failure. It must be noted that the life of individual bearings can only be predicted by statistical methods. Life calculation is only about 90% of the bearing group and the reliability of certain procedures. In actual use the fault is usually not caused by fatigue, the more the situation is pollution, wear, misalignment, corrosion caused by, or cage, lubricant or seal caused by failure.
Another "life" is the "agreed life", by the official department or the development of industry-standard institutions designated by the agency, and based on a load and speed for the assumption of working conditions. This is basically the basic rating of the bearing life, generally based on the experience of similar applications may be.
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