Disc Type Special Machine Bearing engineer repair and maintenance of bearing notes! In order to determine whether the removed bearing can be used, it is necessary to check after the bearing is washed. Check the state of the rolling track surface, rolling surface and mating surface, the wear of the cage, the increase of bearing clearance and the damage and abnormality unrelated to the decrease of dimensional accuracy.

Bearing inspection and judgment

Tapered roller bearings and other separated bearings can be checked separately on the raceway surface of the rolling body and the outer ring.

Bearing cleaning

When disassembling the bearing for maintenance, first record the appearance of the bearing, confirm the residual stock of lubricant, sample the lubricant for inspection, and wash the bearing.

Cleaning agents generally use ordinary gasoline, kerosene.

The cleaning of the removed bearings is divided into rough cleaning and fine cleaning, respectively, and placed in the container, first placed on the bottom of the metal mesh, so that the bearing does not directly contact the dirt of the container.

During rough cleaning, if the bearing rotates with dirt, the rolling surface of the bearing will be damaged, and it should be paid attention to. In the crude cleaning oil, use a brush to remove grease and adhesion, roughly clean, transfer to fine washing.

Fine washing is to rotate the bearing in the cleaning oil while carefully cleaning it. In addition, the cleaning oil should be kept clean frequently.

Bearings with the following defects can no longer be used

① There are cracks or notches on any one of the inner ring, outer ring, rolling element or cage;

(2) There is a fracture on either the ring or the rolling element;

(3) Raceway surface, guard edge and rolling body have significant stuck injuries;

(4) Cage wear is significant, or the nail is significantly relaxed;

⑤ Rust and injury on the raceway surface and rolling body;

⑥ Raceway surface and rolling body have serious indentation and marking;

⑦ There is obvious creep in the inner meridian of the inner ring and the outer meridian of the outer ring;

⑧ Obvious discoloration due to heat;

⑨ The bearing sealed with grease, the damage of the sealing ring or dust cover is obvious.

Bearing use precautions

Rolling bearings are precision components, no matter how high performance bearings are used, if they are used improperly, they will not get the expected high performance. The use of bearings should be noted as follows:

1. Keep bearings and their surrounding environment clean

Even if the tiny dust that is invisible to the naked eye enters the bearing, it will increase the wear, vibration and noise of the bearing. Bearings and their surrounding accessories should be kept clean, especially dust and dirt, tools and the environment must also be kept clean.

Ii. Precautions when using and installing

It is not allowed to force stamping, it is not allowed to hit the bearing directly with the hammer, and it is not allowed to transfer pressure through the rolling element.

3. Use appropriate and accurate installation tools

Try to use special tools and avoid things like cloth and staple fibers.

4. Prevent corrosion of bearings

When holding the bearing directly by hand, it is necessary to fully wash the sweat on the hand and apply high-quality mineral oil before operation, especially in the rainy season and summer. However, under some special operating conditions, the bearing can obtain a longer life than the traditional calculation, especially in the case of light load. These special operating conditions are when the rolling surface is effectively separated by a lubricating film and limits the surface damage that can result from contaminants. In fact, under ideal conditions, the so-called permanent bearing life is possible.

Common problems and countermeasures in bearing use

1. Abnormal load: Select the appropriate assembly clearance and preload force.

2. Poor assembly: Improve the processing accuracy of the shaft and improve the installation method.

3. Insufficient lubricant: Supplement or use appropriate lubricant.

The rotating vibration of the shaft is large

1. Peeling: fatigue peeling, replace the bearing.

2. Poor assembly: Improve the processing accuracy of the shaft and improve the installation method.

3. Foreign body intrusion: clean the relevant parts and use clean grease.

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