Maintenance Technology for Clearance Change and Failure of INA Combined Needle Roller Bearing

Now let’s analyze what is the cause of NTN bearing failure. There has been rolling mill bearing failure in recent years. Engineers are also looking for the cause, but they have not found it. And properly block sundries and moisture, indicating that the oil seal should not be worn However, when opening the bearing housing, check the bearing and regularly check the oil seal Check the condition of the oil seals near the high temperature bearing to ensure that they are sufficient to prevent hot or corrosive liquid or gas from penetrating the bearing along the axis.

• Generally, the temperature of NTN bearing starts to rise slowly with the operation of the bearing and reaches a stable state after 1-2 hours. The normal temperature of rolling mill bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are appropriate, the bearing temperature will rise sharply and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures must be taken.Maintenance Technology for Clearance Change and Failure of ina Combined Needle Roller Bearing
• The thermal sensor can monitor the working temperature of the bearing at any time, and automatically alarm or stop when the temperature exceeds the specified value to prevent the occurrence of combustion shaft accident.
• High temperature often indicates that NTN bearing is in abnormal condition. High temperature is also harmful to the lubricant of rolling mill bearings. Sometimes bearing overheating can be attributed to the lubricant of the bearing. 
• If the temperature of the bearing exceeds 125 ℃ for a long time, the service life of the bearing will be reduced. The causes of high temperature bearings include insufficient or excessive lubrication and lubricant. It contains impurities, excessive load, bearing ring damage, insufficient clearance, high friction caused by oil seal, etc.Maintenance Technology for Clearance Change and Failure of ina Combined Needle Roller Bearing
• Therefore, it is necessary to continuously monitor NTN bearing temperature, whether it is measuring the rolling mill bearing itself or other important parts. If the operating conditions remain unchanged, any temperature change can indicate that a fault has occurred.

Maintenance Technology for Clearance Change and Failure of ina Combined Needle Roller Bearing

• In fact, the bearing faults we analyzed before are not so possible. High temperature is also harmful to the lubricant in the bearing. Sometimes the overheating of the bearing can be attributed to the lubricant of NTN bearing. If the bearing operates for a long time at a temperature of more than 125 ℃, the service life of high-temperature bearing will be reduced. 
• The reasons for high-temperature bearing include insufficient or excessive lubrication, magazine contained in the lubricant, excessive load, damage of rolling mill bearing and insufficient clearance, And high temperature friction caused by oil seal, etc. Well, let’s summarize these. If you are incomplete, we can only say so much about the failure of NTN bearing.Maintenance Technology for Clearance Change and Failure of ina Combined Needle Roller Bearing