Precautions for preventing premature failure of TIMKEN deep groove ball bearings

TIMKEN bearing contact fatigue failure is the failure of the working surface of the bearing due to the alternating stress, and deep spalling is the intrinsic cause of contact fatigue failure.
We know that contact fatigue spalling occurs on the working surface of deep groove ball bearings, often accompanied by fatigue cracks, first generated from the maximum alternating shear stress below the contact surface, and then extended to the surface to form different spalling shapes, such as dots. Peeling or pitting, peeling off into small pieces called shallow peeling. Due to the gradual enlargement of the exfoliation surface, it tends to expand deeper and form deep exfoliation.
Wear failure refers to the failure of the relative sliding friction between the surfaces resulting in the continuous wear of the metal on the working surface.
Continued wear and tear will cause gradual damage to the bearing components and ultimately lead to loss of bearing dimensional accuracy and other related problems. Wear may affect the shape change. The increase of the clearance and the change of the surface of the working surface may affect the lubricant or cause the pollution to a certain extent, resulting in complete loss of the lubrication function, thus causing the bearing to lose the rotation accuracy or even the normal operation. Wear failure is one of the common failure modes of various types of bearings. It is usually classified into the most common abrasive wear and adhesive wear according to the form of wear.
The main cause of TIMKEN bearing fracture failure is the defect of TIMKEN bearing itself and the overload during use.
When the applied load exceeds the material strength limit and the part is broken, it is called overload fracture. The main reason for the overload is the sudden failure of the host or improper installation. Defects such as microcracks, shrinkage cavities, air bubbles, large foreign objects, overheated tissue and localized burns of the bearing parts also cause breakage at the defects during impact overload or severe vibration, called defect fracture. It should be pointed out that in the manufacturing process, in the process of re-inspection of raw materials, quality control of forging and heat treatment, and process control, the above defects can be correctly analyzed by instruments, and control must be strengthened in the future. However, in general, most of the deep groove ball bearing fracture failures are overload failure.
1) Keep the bearings and their surroundings clean
2) Careful and careful when using
If it is used carelessly to give the bearing a strong impact, the bearing will be injured, indented, broken and injured.
3) Use the right tools
4) Pay attention to the rust prevention of the bearing
Avoid using it in wet areas, and wear gloves if you don't get sweat on it.
5) Users should be familiar with bearings
6) Formulate the operating specifications for the use of deep groove ball bearings
a, the preservation of bearings
b, cleaning of bearings and their surroundings
c. Inspection of the size and processing quality of the installation site
d, installation work
e, post-installation check
f, disassembly work
g, maintenance (regular inspection)
h, lubricant supplement

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Thrust ball bearing installation stability maintenance problem solution

When inspecting the thrust ball bearings that have been removed during the regular inspection and operation of TIMKEN bearing equipment and the replacement of peripheral parts, it is necessary to determine in turn whether the secondary bearing parts can be reused and the usage is better. Also carefully investigate and record the removed bearings and appearance. In order to clarify and investigate the remaining amount of lubricant, the bearings should be cleaned well after sampling.
Next, check the raceway surface of the bearing, the condition of the rolling surface and the mating surface, and the wear state of the cage, etc., for damage and abnormality, especially to observe the running track of the raceway surface. To determine whether the bearing can be used again, it is necessary to consider the degree of damage to the thrust ball bearing, machine performance, importance, operating conditions, inspection cycle, etc.
If the bearing is found to be damaged or abnormal, please find out the cause according to the phenomenon of bearing damage and formulate countermeasures. In addition, the inspection results, if there are the following defects, TIMKEN bearings can no longer be used, need to replace the new bearings.
    When grease is added to anti-friction bearings, high pressure theory may not be required unless it is used with great care. High pressure can damage bearings and waste grease. Excessive grease can cause high temperatures and create an invisible environment around the bearings. In most applications, ball or roller bearings are fully lubricated if the grease level is between one-third and one-half of the bearing capacity. The excess will usually be wasted by the sealed casing.
1. Are all requirements for the installation surface and installation site?
If there is foreign matter such as iron filings, burrs, dust, etc. in the thrust ball bearing, the bearing will generate noise and vibration during operation, and even damage the raceway and rolling elements. Therefore, before installing the bearings, you must ensure that the mounting surface and the installation environment are clean.
2. Must the bearings be cleaned before installation?
The surface of the bearing is coated with anti-rust oil. You must clean it with clean gasoline or kerosene, and then apply it with clean high-quality or high-speed high-temperature grease.
The effect of cleanliness on TIMKEN bearing life and vibration noise is very large.
But we must remind you that the fully enclosed bearings do not need to be cleaned and refueled.
3. How to choose grease?
Lubrication has a very important influence on the operation and life of the bearing.
Here is a brief overview of the general principles for selecting grease. Grease is made of base oil, thickener and additives. The grease performance of different types and different grades varies greatly. The allowable rotation limit is different. Be careful when selecting.
The performance of the grease is primarily determined by the base oil.
Generally low viscosity base oil is suitable for low temperature and high speed; high viscosity is suitable for high temperature and high load.
The thickener is also related to the lubricating properties, and the water resistance of the thickener determines the water resistance of the grease.
In principle, the different greases of the brand cannot be mixed, and even the grease of the same thickener may have a bad influence on each other due to the different additives.
4. When lubricating the bearing, the more grease is applied, the better?
When lubricating a bearing, the more grease is applied, the better. This is a common misconception.
Excessive grease in the thrust ball bearing and bearing housing will cause excessive agitation of the grease, resulting in extremely high temperatures.
5. How to install and disassemble?
Do not directly hammer the end surface of the thrust ball bearing and the non-stress surface during installation. The bearing should be evenly stressed by the clamp, sleeve or other installation tools.
If the mounting surface is coated with oil, it will make the installation smoother.
If the interference is large, the bearing should be placed in mineral oil and heated to 90~100 °C and installed immediately. When disassembling is difficult, it is recommended that you use the disassembly tool to pull outward while carefully pouring hot oil onto the inner ring. The heat will cause the inner ring of the TIMKEN bearing to expand, making it easier to fall off.

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