Common damage causes of powder metallurgy bearings

Common damage causes of powder metallurgy bearings

The powder metallurgy bearing is made of metal powder and other antifriction materials powder, sintering, shaping and oil immersion. It has a porous structure. After being moistened by hot oil, the holes are filled with smooth oil. When working, the journal rotates to attract and collide with heat. The metal and oil expand with heat, extruding the oil from the hole, and then collide with each other. The powder metallurgy bearing is an important basic component of various mechanical equipment, its accuracy, function Life and reliability play a decisive role in the accuracy, function, life and reliability of the host. However, it is likely to be damaged during use. So what are the common causes of damage to powder metallurgy bearings? The following is introduced by the manufacturer:

Temperature: the influence of temperature on the bearing. High temperature indicates that the bearing is abnormal. High temperature is also harmful to the lubricant of bearings. Bearing overheating may be the lubricant of bearing. If the temperature of powder metallurgy bearing exceeds 125 ℃ for a long time, the bearing life will be reduced. The reasons for high temperature bearings are insufficient or excessive smoothness, the lubricant contains impurities, the load is too large, the bearing is worn, the gap is insufficient, and the high conflict caused by oil seals.

Therefore, it is necessary to continuously monitor the temperature of powder metallurgy bearings, whether measuring the bearing itself or other important parts. If the operating conditions remain unchanged, any temperature change indicates a fault.

In general, one third of the damage of powder metallurgy bearings is caused by fatigue, the other one third is caused by poor smoothness, and the other three are caused by pollutants entering the bearings or improper installation.

There are many reasons for the damage of powder metallurgy bearings, such as the load exceeding the original estimate, the useless seal, the too small bearing clearance caused by the tight fit, and so on. Any of these elements has special damage models, leaving special damage marks.