Troubleshooting of Rolling Bearings (2)
1. Brinelling and Chattering
Brinellmarking or chatter is caused by impact that occurs when the bearings are installed. Some possible causes of brinelling include improper installation, electric shock, and high frequency vibration. The result is an indentation or scuffing of the rolling elements, raceways, and/or cages. Such markings are permanent and will lead to increased vibration, noise, and reduced bearing life. To avoid brinelling, you should use correct installation tools, lubricate properly, and properly tighten the components when installing the bearing.
2. Bearing Operating Temperature
Excessively high bearing temperatures are usually caused by unsuitable lubricants or incorrect levels of lubricant. This leads to accelerated sliding or fatigue failure of bearings due to excessive friction, which can cause the bearing to overheat. If this is left unchecked, it can lead to an increase in noise and vibration, and to failure of the bearing. When the temperature exceeds 260°C (500°F), the bearing should be replaced. If the bearing continues to operate under high temperature conditions, its life may be reduced. Bearings should be lubricated regularly and to the proper levels to ensure proper operation.
3. Rust and Corrosion
The formation of rust and corrosion on rolling bearings is often caused by a lack of sufficient lubrication or an inadequate protective coating on the bearing. Rust formation can lead to premature bearing failure, resulting in noise and vibration. To prevent the formation of rust or corrosion, the bearings should be kept clean, properly lubricated, and protected with a suitable seal or protective coating.
4. Worn Out Bearings
Worn out bearings are a common cause of bearing failure. This is usually caused by improper maintenance or incorrect levels of lubrication. Worn out bearings can lead to increased noise and vibration levels, causing premature bearing failure. To prevent this from occurring, bearings should be inspected for wear and damage at regular intervals and replaced as needed. Proper maintenance and lubrication are also important.
5. Misalignment
Misaligned bearings are a common cause of bearing failure. This can be caused by improper installation or by excessive load on the bearing. Misalignment can cause increased vibrations and noise, and can lead to premature bearing failure. To prevent misalignment, bearings should be carefully installed and supported by rigid shafts in order to minimize deflection under load.
In conclusion, rolling bearings are essential components in many machinery and cause many of their problems. The key to a successful operation of all machinery is in its proper maintenance and, in the case of rolling bearings, proper installation and correct lubrication. Operating temperatures should be kept within the recommended limits for each bearing. In addition, all bearing components should be checked for wear and damage at regular intervals and replaced as needed. To prevent excess noise, vibration, and premature bearing failure, all of the above-mentioned causes of bearing failure must be eliminated or reduced.
