Bearing maintenance is a necessary condition for the operation of ina combined needle roller bearing. The common maintenance is for the lubrication of bearing. After reading how to select the lubrication mode of bearing and understanding the lubrication mode of bearing, it is also necessary to understand the maintenance of bearing system.
Let’s see how to carry out bearing lubrication and maintenance.Maintenance Technology for Clearance Change and Failure of ina Combined Needle Roller Bearing
1、 The use and installation shall be careful, and strong stamping is not allowed. The solution to the bad phenomenon of ina combined needle roller bearing is not allowed to directly knock the bearing with a hammer, and the pressure is not allowed to be transmitted through the rolling body.Maintenance Technology for Clearance Change and Failure of ina Combined Needle Roller Bearing
2、 Use proper and accurate installation tools, try to use special tools, and try to avoid using cloth and short fiber.
3、 Keep ina combined needle roller bearing and its surrounding environment as clean as possible. Sodium base grease is generally used for motor bearing. Even if the invisible smile dust enters the bearing, it will increase the wear, vibration and noise of the bearing.Maintenance Technology for Clearance Change and Failure of ina Combined Needle Roller Bearing
4、 To prevent the corrosion of ina combined needle roller bearing, when taking the bearing directly by hand, fully wash the sweat from your hands and apply high-quality mineral oil before operation. Pay special attention to rust prevention in rainy season and summer. Under some special operating conditions, ina combined needle roller bearing can obtain a longer life than the traditional calculation, especially under light load. The damage mechanism of the labyrinth bearing and the seal surface of the rolling bearing may be limited by these factors.
Lubricants are important not only for bearings, but also for all bearings. However, please note that ina combined needle roller bearing should not add too much grease. Then it’s time to change the lubricant of the bearing. After draining the old engine oil, if possible, the bearings lubricated with engine oil should be filled with fresh engine oil and let the machine rotate at low speed for a few minutes.
Make the oil collect residual pollutants as much as possible, and then drain the oil. When replacing the grease of the bearing lubricated with grease, the Joe remover used shall avoid the contact of cotton with any part of the bearing. Because these residual fibers may wedge between rolling parts and cause damage, especially in bearing applications.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