Damage, assembly, maintenance and repair of NTN imported bearings

Not all damaged bearings can be repaired, but for each damaged bearing, the cause and extent of damage must be evaluated to avoid or reduce re-damage before considering repairing or replacing a new NTN imported bearing. There are many causes of bearing damage, such as improper installation, dirt intrusion or moisture intrusion, which are common causes of early damage in many bearings. Analysis of common causes of damage to NTN imported bearings and corresponding preventive measures to extend the life of NTN imported bearings.

A. Improper operation:

Improper installation, operation or disassembly may cause deformation or defect of the cage

Precautions: Use appropriate handling, installation and removal tools

B. Insufficient lubrication:

Insufficient or improper lubrication may result in component scratches or severe NTN bearing deformation

Precautions: Improve the lubrication system and properly replenish or replace the lubricant at regular intervals

C. Rusty and corrosion:

Contact with water may cause NTN imported bearing components to erode and rust. NTN imported bearings after rust damage may cause spalling during work

Precautionary measures: Regularly check the seal to ensure a good sealing effect and properly store the NTN imported bearings.

D. Current:

Powering up the NTN's imported bearings may cause grooves or nicks. Improper electrical grounding of NTN imported bearings can cause minor burns

Precautions: Reduce or avoid current flow through NTN inlet bearings by properly grounding connections prior to soldering of components other than NTN bearings.

E. External materials:

Wear particle contamination and debris intrusion may cause wear, abrasion and dents on the NTN bearing bearing face

Precautions: Remove invading particles and debris, replace lubricant, check sealing system

F. eccentric:

Eccentricity, tilting, or excessive loading can cause geometric stress concentrations or surface spalling

Precautions: Precision machining of NTN housings and shoulders

When the NTN imported bearing equipment is regularly inspected and operated, and the bearings that have been removed during the replacement of the peripheral parts are stopped, it is necessary to determine whether the secondary bearing parts can be reused and the operation status is better or worse.

Secondly, check the raceway surface of the NTN imported bearings, the condition of the rolling surface and the joint surface, and the damage and abnormal conditions of the truss wear. It is necessary to check the running track of the raceway surface. To determine whether the bearing can be used again, it is necessary to consider the level of bearing damage, mechanical function, primacy, operational premise, and inspection cycle.

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INA outer spherical bearing lubricants to solve the problem

INA bearing will change its bearing capacity, rotation precision and wear resistance due to its own quality and external conditions during use. When the performance index of the outer spherical bearing is lower than the use requirements and cannot work normally, the bearing will occur. If the fault occurs or even fails, the machine and equipment will stop and there will be various abnormal phenomena such as loss of function in case of failure of the bearing, etc. Therefore, it is necessary to find out the cause in a short period of time and take corresponding measures.

In order to maintain the bearing under good conditions, it should maintain its proper performance and long-term use. Bearings must be inspected and maintained. Inspection and maintenance are important to prevent malfunctions. During operation, it is important to check the rolling noise, vibration, temperature and lubricant of the bearings.

Under the conditions of high speed and high temperature, the adjustment scheme of the combined position and clearance of the outer spherical bearing can be oil lubricated when the grease lubrication is not suitable. A large amount of heat can be taken away by the circulation of the lubricating oil. Viscosity is an important characteristic of lubricating oil. The viscosity directly affects the fluidity of lubricating oil and the thickness of oil film formed between friction surfaces. The viscosity of lubricating oil at INA bearing working temperature is generally 12-15cst. The higher the speed, the lower the viscosity, and the heavier the load, the higher the viscosity. Commonly used lubricating oils include mechanical oil, high-speed mechanical oil, turbine oil, compressor oil, transformer oil, cylinder oil, and the like.

Oil lubrication methods include:

a. Oil bath lubrication

Oil bath lubrication is the most common lubrication method. It is suitable for the lubrication of low and medium speed bearings. Part of the bearing is immersed in the groove. The lubricating oil is brought up by the rotating bearing parts and then flows back to the oil groove. The oil level should be slightly lower than the minimum. The center of the rolling element.

b. drip lubrication

Drip lubrication is suitable for the outer spherical bearing parts that need to be quantitatively supplied with lubricating oil. Considering the structural design of the bearing supporting parts during thermal expansion, the amount of dripping is generally one drop every 3-8 seconds, and excessive oil quantity will cause the bearing temperature to increase.

c. Circulating oil lubrication

The filtered oil is delivered to the bearing components by an oil pump, filtered through the lubricating oil after the bearings, and then cooled and used. Since the circulating oil can take away a certain amount of heat and cool the bearing, this method is suitable for INA bearing parts with high speed.

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