Extend the maintenance and maintenance of INA combined bearing life cycle

     After the INA combination bearing has been installed, if it is not carefully aligned, alignment may result in additional loads, friction and vibration of the INA combination bearing. These can accelerate fatigue and reduce bearing life and can damage the life of other machine parts. In addition, increased vibration and friction can greatly increase energy consumption and risk of premature failure.
    In order to fully utilize the bearings and maintain their proper performance for a long time, regular maintenance (regular inspection) must be performed. Through proper periodic inspections, early detection of failures and prevention of accidents are important to improve productivity and economy.
1, cleaning
When the INA combination bearing is removed and inspected, the appearance record is first recorded by photography. Also, verify the amount of lubricant remaining and sample the lubricant before cleaning the bearings.
a. The cleaning of the bearing is carried out by rough washing and fine washing, and a metal mesh frame can be placed on the bottom of the used container.
b. When rough washing, remove the grease or adhesive with a brush or the like in the oil. At this time, if the INA combination bearing is rotated in the oil, be careful that the rolling surface will be damaged by foreign matter or the like.
c. When washing finely, slowly rotate the bearing in the oil and carry out it carefully.
The cleaning agent generally used is a neutral non-aqueous diesel oil or kerosene, and a warm alkali liquid or the like is sometimes used as needed. Regardless of which cleaning agent is used, it is often filtered and kept clean.
2, inspection and judgment
In order to judge whether the removed INA combination bearing can be reused, it is necessary to check its dimensional accuracy, rotation accuracy, internal clearance, mating surface, raceway surface, cage and seal ring.
3. Basic condition monitoring
During use, the basic external conditions of the US INA combined bearing operation are often monitored, such as temperature, vibration and noise measurements. These regular inspections will identify potential problems early and will prevent unexpected machine stops, enabling production plans, increased plant productivity and efficiency.
4, relubrication
During operation, the bearing is required to have the correct relubrication to perfect its performance. The method of bearing lubrication is divided into grease lubrication and oil lubrication. In order to make the bearing function well, first, choose a lubrication method that suits the conditions of use and the purpose of use. Lubricity of oil lubrication predominates if only lubrication is considered. However, grease lubrication has the advantage of simplifying the structure around the bearing.
5, remove
When the bearing will reach its end of life, it should be replaced. Although the bearing can no longer be used, correctly removing the original INA combined bearing and replacing the new bearing in time can promote the service life of the new INA combined bearing. First, the use of a suitable removal tool will help prevent damage to other machine components. Second, improperly removed technology can be hazardous to the operator.

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Analysis of maintenance technology of IKO needle roller bearing with lubrication

    The function of the IKO bearing fit is to make the stationary and rotating rings of the needle bearing and the stationary part (usually the bearing seat) and the rotating part (usually the shaft) of the mounting part, respectively, to achieve the transfer of the load under rotation. And the basic task of defining the position of the motion system relative to the stationary system.
Needle bearings are required to be fixed in three directions, radial, axial and tangential, on the shaft and in the housing. The radial and tangential positioning is achieved by the tight fit of the bearing ring. The axial positioning is only used in a few cases. The axial position is generally limited by axial limit parts such as end caps and retaining rings. Within the clearance range.
When choosing a fit, you should pay attention to the following four points:
 (1) The circumferential surface of the bearing ring should have good support and uniform force to reduce deformation, and fully exert the bearing capacity of IKO bearing.
 (2) The ferrule cannot slide in the tangential direction in its mating surface, otherwise the mating surface will be damaged.
 (3) The free end bearing must be compatible with the length change of the shaft and the housing bore, that is, it must have the ability to accommodate the axial position to swim within a certain range.
 (4) It must be noted that the needle roller bearing is easy to install and disassemble, saving labor, time and money.
For heavy loads, the grease with a small penetration should be selected for high pressure, and the oil film strength and extreme pressure performance should be high. When selecting grease according to environmental conditions, calcium-based grease is not easily soluble in water and is suitable for drying and low moisture environments. Commonly used greases for IKO bearings include calcium-based greases, sodium-based greases, calcium-based greases, lithium-based greases, aluminum-based greases, and molybdenum disulfide greases. The amount of grease filled in the needle bearing is suitable for filling 1/2-1/3 of the inner space of the bearing. At high speeds, reducing the grease to 1/3 will increase the temperature rise.
The temperature of the bearing, generally the temperature outside the bearing can be inferred. If the oil hole can directly measure the outer ring temperature of the thin-walled bearing, it is more suitable. Usually, the temperature of the bearing rises slowly as the bearing starts to run, and reaches a steady state after 1-2 hours. The normal temperature of the needle bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are suitable, the IKO bearing temperature will rise sharply and abnormal temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions.
The bearing is a kind of precision mechanical support component. The bearing user deeply hopes that the bearing mounted on the main machine will not damage and maintain its dynamic performance within the predetermined service period, but the objective facts are sometimes not satisfactory, sudden bearing failure accident. Will cause significant losses to users. Through a large number of bearing failure analysis studies, the short-life or premature loss of precision of needle roller bearings is due to material defects or improper manufacturing, but to a considerable extent, it is not installed and maintained in strict accordance with the requirements of bearing use. Or improper bearing damage or actual load exceeding the rated load of the thin-walled bearing itself causes abnormal damage to the IKO bearing.
Cracking and spalling of the bearing is caused by the cyclic load of the bearing, and the contact surface is prone to fatigue damage. Therefore, in order to improve the service life of the needle bearing, the bearing steel must have high contact fatigue strength.
Hardness is one of the important qualities of IKO bearing quality, and has a direct impact on contact fatigue strength, wear resistance and elastic limit. The hardness of the thin-walled bearing steel in the state of use generally reaches HRC61~65, so that the needle bearing can obtain high contact fatigue strength and wear resistance.

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