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The cause of high temperature of NSK bearing caused by oil pollution and its cleaning method

The cause of high temperature of NSK bearing caused by oil pollution and its cleaning method

2020-06-15

Because bearings are often used, oil stains will reduce the service life of bearings. How do we remove oil stains on NSK bearings?Here is an easy way to remove oil stains from NSK bearings.

Soft dry oil or rust cream hardened bearing, should be immersed in 100℃~200℃ hot oil, with pliers clamped the bearing, brush clean bearing oil.The soft dry oil or antirust paste is melted when heated to 100℃~200℃ and is easily flushed out from the cracks in the bearing.Sometimes as long as the bearing in the oil multiple times shake.Oil spills out of cracks and crevices.

When cleaning the NSK bearing's centriped-spherical bearings, the ball bearings, ball racks, and inner rings should be rotated laterally out of the outer ring and then immersed in hot oil. When cleaning the short cylindrical roller bearings, the ball bearings, ball racks, inner rings and outer rings should also be removed.

When cleaning the hot oil, the temperature of the oil should not exceed 20℃.

NSK bearing temperature, the general bearing outdoor temperature can be inferred, if the use of oil hole can directly measure the NSK inlet bearing outer ring temperature, it is more appropriate. 

Usually, the temperature of NSK bearing slowly rises with the bearing operation, and reaches a stable state 1-2 hours later.The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine.If the lubrication and installation part are appropriate, the bearing temperature will rise sharply and abnormal high temperature will occur. At this time, the operation must stop and necessary preventive measures must be taken. 

The use of heat sensors can monitor the operating temperature of NSK bearings at any time, and realize the automatic alarm or stop when the temperature exceeds the specified value to prevent shaft accidents. 

High temperature often indicates that NSK bearings have been in abnormal condition.High temperatures are also harmful to bearing lubricants.Sometimes bearing overheating can be attributed to the bearing lubricant.If NSK bearings in the temperature of more than 125℃ long-term continuous transfer to reduce the bearing life.Causes of high temperature NSK bearings include: insufficient or excessive lubrication, lubricants.Contains impurities, excessive load, bearing ring damage, insufficient clearance, and high friction caused by oil seal, etc. 

Therefore, continuous monitoring of NSK bearing temperature is necessary, whether the NSK bearings themselves or other important parts.If the operating conditions are unchanged, any change in temperature may indicate a failure. 

Regular measurements of NSK bearing temperature can be made using thermometers, such as digital thermometers, which measure the bearing temperature accurately and display it in units of ℃ or Fahrenheit.Bearing of importance, which means that when damaged, it will cause the shutdown of the equipment, so this type of bearing should be equipped with a temperature detector.Under normal circumstances, NSK bearings will have a natural temperature rise after just lubrication or re-lubrication and will last for one to two days.

Usually, the working temperature of more than 150° bearings is called high temperature bearings, because the chromium bearing steel in the use of temperature more than 150°, its hardness will drop sharply, dimension instability, so that the bearing can not work normally.Therefore, for NSK bearings with operating temperature from 150° to 350°, if the ring and rolling body are still made of ordinary high-carbon chromium bearing steel, special tempering treatment must be carried out for NSK bearing parts, which should be generally tempered above the operating temperature of 50°.After tempered according to the above requirements, the bearing steel can be used normally under the working temperature.However, due to the decrease in hardness after tempering, the service life of NSK bearings is reduced.


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