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Collection of common problems of imported bearings

by:JNSN     2021-10-24

Imported bearings are precision parts. We need to pay attention to many tiny details in daily use and maintenance, so as to better maintain and maintain the bearings.

Today, Junshengda Imported Bearing Co., Ltd. sorted out some frequently encountered problems in the use of imported bearings and gave answers, hoping to help everyone.

Q: Is the radial clearance of imported bearings as small as possible?

Answer: Not necessarily! Not all imported bearings require the smallest working clearance, you must select the appropriate clearance according to the conditions. For example, in the national standard 4604-93, the radial clearance of rolling bearings is divided into five groups-2, 0, 3, 4, and 5 groups. The clearance values u200bu200bare from small to large, and the 0 group is the standard clearance. The basic radial clearance group is suitable for general operating conditions, normal temperature and commonly used interference fit; bearings that work under special conditions such as high temperature, high speed, low noise, low friction, etc. should use large radial clearance; Bearings for precision spindles and machine tool spindles should have a smaller radial clearance; for roller bearings, a small amount of working clearance can be maintained. In addition, for separate bearings, there is no such thing as clearance; finally, the working clearance of the bearing after installation is smaller than the original clearance before installation, because the bearing has to bear a certain load rotation, and the imported bearing needs to be matched and generated by the load. The amount of elastic deformation. Therefore, the radial clearance of imported bearings is not necessarily as small as possible.

Question: How to check the faults and deal with them during the operation of imported bearings?

Answer: Please refer to the article 'Checking the malfunctions of imported bearings in operation and the treatment methods' in the imported bearing area of u200bu200bthis site.

Q: What is the bearing steel of imported bearings? What material is it made of? How to classify?

Answer: The material of the inner and outer rings and steel balls of imported bearings is bearing steel (vacuum heat treatment). Most of the imported bearings use SUJ2 in the JIS steel grade, which is the domestic chromium steel (GCr15). The chemical composition of SUJ2 has been standardized as a bearing material in various countries around the world. For example: AISL52100 (USA), DIN100Cr6 (West Germany), BS535A99 (UK), etc. are all of the same kind of steel. The use of this material effectively improves the torque performance of the bearing, reduces noise and prolongs its life. However, in humid or high temperature environments, martensitic stainless steel materials are required.

Question: Please introduce the function of imported bearing cage and its structural characteristics.

Answer: Please refer to the article 'The Role and Structural Features of Imported Bearing Cages' in the Imported Bearings section of this site.

Q: What is the reason for the regular sound of imported bearings?

Answer: The regular sound of imported bearings may be caused by the following two reasons:

1. Foreign matter causes channel rust, indentation and scars.

The solution is: clean the relevant parts and use clean grease

2. The channel peels off and fatigue wears.

The solution is: replace the bearing.

Q: What should I pay attention to in the use of imported bearings?

Answer: Please refer to the article 'Matters Needing Attention in the Use of Imported Bearings' in the Imported Bearings section of this site.

Q: Do imported bearings have to be cleaned before installation?

Answer: Yes. Because the surface of imported bearings is coated with anti-rust oil, not only need to be cleaned, but also must be carefully cleaned with clean gasoline or kerosene, and then coated with clean, high-quality or high-speed and high-temperature lubricating grease before installation and use. Cleanliness has a great influence on bearing life and vibration and noise.

But what we want to remind you in particular is: fully enclosed bearings do not need to be cleaned and refueled.

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