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How to clean the bearings correctly?

wallpapers Tech 2020-10-27
Many friends know that most of the newly bought bearings are coated with grease, but these greases are mainly used to prevent the bearing from rusting, and do not have a lubricating effect. The bearings are particularly easy to trap dirt, which is generally difficult. Wash thoroughly. Even if you buy unlubricated bearings, they will absorb dust due to magnetism and airflow over time. It is mixed with sweat and water vapor to form a "dirt cluster" in the bearing, between the balls, and at the gap, which is "fatal" to the rotation of the bearing.
If the bearing is used for a long time, it will come into contact with dust, oil or water in the air, causing the bearing to become dry, rusty, and affect operation. At this time, bearing cleaning is very important.
1. How to clean the bearing correctly
When disassembling the bearing for maintenance, first record the appearance of the bearing, confirm the remaining amount of lubricant, take a sample of the lubricant for inspection, and then wash the bearing.
The selected cleaning agent, generally speaking, the anti-rust oil sealed on the bearing can be cleaned with a solvent-based cleaning agent. If there is a thicker anti-rust oil on the bearing, you can first use a solvent-based oil cleaner for metal parts, such as WY-Y155 of our company's Wuyang Hydrocarbon, and properly heat it to dissolve and clean. After the surface anti-rust grease is dissolved, take it out, and then Just wipe it.
When cleaning, you should first pinch the inner ring of the bearing with one hand and slowly rotate the outer ring with the other hand until the oil on the rolling elements, raceways and cage of the bearing is completely washed off, and then clean the surface of the outer ring of the bearing.
At the beginning of cleaning, it should be rotated slowly, swayed back and forth, and rotated too hard, otherwise the raceways and rolling elements of the bearing will be easily attached to dirt. When the number of bearing cleaning is large, it can be divided into two steps: coarse and fine cleaning. During rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing, so care should be taken. In the rough cleaning oil, use a brush to remove grease and adhesions. After it is roughly clean, switch to fine cleaning. Fine washing is to carefully clean the bearing while rotating it in the cleaning oil.
For bearings that are inconvenient to disassemble, wash them with a cleaning agent for parts to melt the old oil, and then use an iron hook or a small spoon to rinse off the remaining oil in the bearing. Be careful not to have an open flame when cleaning.
2. How to confirm that the bearing is cleaned
After the bearing is cleaned, carefully observe that there will always be some remaining oil in the inner and outer ring raceways, on the rolling elements and in the gaps of the cage. During the inspection, scrape out the remaining oil with a clean feeler gauge, apply it to the thumb, and slowly rub back and forth with your index finger. If there is a rustle between your fingers, it means that the bearing has not been cleaned and should be washed again.
Finally, hold the bearing in your hand, pinch the inner ring, turn the outer ring to rotate horizontally (large bearings can be placed on the assembly table, the inner ring is cushioned, the outer ring is suspended, the inner ring is compressed, and the outer ring is rotated) to rotate Flexible, non-blocking, and no beating are qualified.
After adding lubricant to the cleaned bearings, they should be placed on the assembly table, with a clean cloth or paper pad underneath, and a plastic cloth on the top for assembly. They are not allowed to be placed on the ground or boxes.
When moving the bearing, it should not be held by hand. Use canvas gloves or wrap the bearing with a clean cloth before taking it, otherwise the bearing surface may produce fingerprints and rust.
Bearings with dust caps or sealing rings on both sides and bearings coated with anti-rust and lubricating grease are already filled with grease during manufacture, so do not clean them before installation.
3. Precautions for bearing use
Bearings are precision parts, and their use must be handled accordingly. No matter how high-performance bearings are used, if they are used improperly, the expected high performance will not be obtained. Precautions for the use of bearings are as follows:
1. Keep the bearing and its surrounding environment clean
Even if tiny dust invisible to the naked eye enters the bearing, it will increase bearing wear, vibration and noise. Bearings and their surrounding accessories should be kept clean, especially dust and dirt, tools and the environment must also be kept clean.
2. Precautions when using and installing
It is not allowed to press hard, directly hit the bearing with a hammer, and not to transmit pressure through the rolling elements.
3. Use appropriate and accurate installation tools
Try to use special tools and try to avoid using things like cloth and short fibers.
Fourth, prevent the corrosion of the bearing
When holding the bearing directly by hand, wash away the sweat from your hands and apply high-quality mineral oil before operating. Pay special attention to rust prevention during the rainy season and summer. However, under certain special operating conditions, the bearing can obtain a longer life than traditional calculations, especially under light load conditions. These special operating conditions are the surface damage that may be caused when the rolling surface is effectively divided by a lubricating oil film and limit contaminants. In fact, under ideal conditions, the so-called permanent bearing life is possible.

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