Date: 2013-08-20

Bearing failure analysis

Determine the damage of bearings in use can take a listen, touch, three observation method to determine the second.
1, observation: If the bearings are well lubricated and no debris and moisture to enter, that bearing oil seal not worn, if after the original housing is opened, Visual inspection and periodical checking of bearing oil seal. Check near the bearing oil seal condition to ensure that they are adequate to prevent hot liquids, corrosive liquids and gases infiltration along the axis of the bearing, oil seal if damaged should be replaced as soon as possible. Check automatic lubrication system to ensure that the combination of oil or grease into the bearing, and ensure the accurate amount of added at the same time check that the lubricant is discolored or black, if there is such a situation typically lubricants contain impurities, which is harmful to bearing.
2, listening: auditory recognition is not a very commonly used method when the rules of operation. Such as using a screwdriver or electronic stethoscopes to detect irregular noise was a streamlined has some experience of the operator and maintenance staff often used approach. Bearing if is good running condition can make a low Purring sound, such as bearing message is sharp sharp sibilant sound, squeaking sound, as well as other irregular sounds, it may be that bearing was already in poor running condition.
3, touch: high temperature bearings are already in unusual circumstances, high-temperature bearing lubricant is harmful, but when high temperature bearings some time caused by lubricant in the bearing, bearing temperatures of more than 120 ℃ long-term operation will reduce the service life of the bearing. Cause of bearing high temperature lubricants contain insufficient or excessive lubrication, lubricant contamination, excessive load, bearing damage, inadequate clearance and friction of the oil seal. In normal circumstances, in the lubrication of the bearing or lubrication after natural temperature and will last for one to two days.

 

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