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What are the effects of ineffective lubrication of bearings

2023-04-11

Rolling bearing is a kind of mechanical element that is widely used in mechanical transmission. The movement condition is mainly rolling and sliding friction. Because friction will cause local thermal deformation, accelerate the wear of part surface, resulting in increased operating error, and even make the spindle scrapped. The causes of bearing failure are often multifactorial, and all factors affecting the design and manufacturing process are related to bearing failure. Analysis of the causes of bearing damage shows that about 40% of bearing damage is related to poor lubrication.

Four major drawbacks of ineffective lubrication of bearings

(1) Discoloration

The contact between metal and metal can cause the bearing temperature to be too high, leading to discoloration of the raceway and rollers. In mild cases, this discoloration is due to lubricant contamination of the bearing surface, while in severe cases, the metal discolors due to high temperatures. In all cases, early detection can avoid expensive repairs.

(2) Scratches and peeling

Check the bearings for signs of metal penetration or metal peeling - these situations require immediate attention. Scratches and peeling are prone to occur in high load low speed applications or continuous high temperatures, while thin or insufficient lubricating oil film can accelerate the occurrence of problems. Insufficient lubrication, incorrect selection of lubricating grease, or sudden changes in working conditions may cause peeling of bearing materials or scratches on the bearing edges.

(3) Roller overheating

Rupture of the lubricating film can cause direct contact between components, resulting in local scratches. In tapered roller bearings, this may manifest as scratches on the large end of the roller and the guide edge. Thermal damage caused by metal to metal contact on tapered rollers

(4) The bearing is completely locked

Local heating will generate metal flow in the bearing, changing the original material and geometric structure of the bearing. This may cause excessive tilting of the rollers, damage to the cage, and complete locking of the bearings. If catastrophic damage does occur, it is recommended to consult a professional to determine the root cause of the problem, as it may be due to factors other than lubrication.

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