As we all know, imported bearings are precision parts. In order to extend their service life, we need to pay attention to many minute details in daily use and maintenance, and to better maintain and maintain the bearings.
Today, Tianjin Toks Bearing Co., Ltd. sorted out some problems often encountered in the use of imported bearings and gave answers, I hope to help everyone.
Q: How do the imported bearings check for faults during operation and troubleshoot them?
A: Please refer to the article “How to check faults and troubleshoot imported bearings during operation†in the imported bearing area of ​​this station (http://).
Question: What is the bearing steel of imported bearings? What material is it made of? How to classify?
Answer: The inner jacket ring and steel ball of imported bearings are bearing steel (vacuum heat treatment). Most of the imported bearings use SUJ2 in JIS steel, which is domestic chrome steel (GCr15). The chemical composition of SUJ2 has been standardized as a bearing material in various countries around the world. For example, it is the same kind of steel as AISL52100 (USA), DIN100Cr6 (West Germany), BS535A99 (UK). The use of this material effectively improves the torque performance of the bearing, reduces noise and extends life. However, in wet or high temperature environments, martensitic stainless steel is required.
Q: Please tell us about the role of the imported bearing cage and its structural features.
A: Please refer to the article "About the role of imported bearing cages and its structural characteristics" in the imported bearing area of ​​this station.
Question: What is the cause of the regular sound phenomenon in imported bearings?
A: The regular sound phenomenon of imported bearings may be caused by the following two reasons:
1. Foreign matter causes channel corrosion, indentation, and scars.
The solution is to clean the relevant parts and use clean grease
2, channel peeling, fatigue wear.
The solution is to replace the bearing.
Q: What should I notice about the use of imported bearings?
A: Please refer to the article “What should be noticed in the use of imported bearings†in the imported bearing area of ​​this station (http://).
Q: Is the radial clearance of the imported bearings as small as possible?
A: Not necessarily!
Not all imported bearings require a minimum working clearance, and you must choose the right clearance depending on the conditions. For example, in the national standard 4604-93, the radial clearance of rolling bearings is divided into five groups - 2 groups, 0 groups, 3 groups, 4 groups, 5 groups, and the clearance values ​​are from small to large, and 0 is the standard clearance. The basic radial clearance group is suitable for general operating conditions, conventional temperature and common interference fit; bearings with high temperature, high speed, low noise, low friction and other special conditions should use large radial clearance; Small radial clearance should be used for precision spindles and bearings for machine tool spindles; a small amount of working clearance can be maintained for roller bearings. In addition, there is no so-called clearance for the separate type of bearing; finally, the working clearance after the bearing is installed is smaller than the original clearance before installation, because the bearing has to bear a certain load rotation, and the bearing bearing fit and load are also required. The amount of elastic deformation.
Therefore, the radial clearance of the imported bearings is not necessarily as small as possible.
Please also refer to the article "About the problem of SKF bearing clearance too small" in the SKF bearing area of ​​this station.
Q: What is the effect of lubrication on imported bearings?
A: You can see the article "Importance of Imported Bearings for Lubrication" in the Bearing Bearing Zone of this station.
Q: Does the imported bearing have to be cleaned before installation?
A: Yes. Because the surface of the imported bearing is coated with anti-rust oil, it is not only necessary to clean, but also must be carefully cleaned with clean gasoline or kerosene, and then cleaned with high-quality or high-speed high-temperature grease. The effect of cleanliness on bearing life and vibration noise is very large.
But we must remind you that the fully enclosed bearings do not need to be cleaned and refueled.
The above is that we have sorted out some questions about imported bearings, I hope everyone can like them. If you have other questions to solve, please contact us.
Author: Stokes Bearing Co., Ltd. Tianjin starting time: 2007.09.13
Copyright, the author must indicate the author and the original source and this statement when reprinting.
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