Extend the life cycle of TIMKEN angular contact ball bearings from maintenance

The main task of angular contact ball bearing failure analysis is to find out the main factors causing bearing failure based on a large number of background materials, analysis data and failure modes, so as to propose improvement measures in a targeted manner, extend the service life of bearings, and avoid TIMKEN bearings. A sudden early failure occurred.

    First of all, the structural design is reasonable and advanced, so that there will be a long angular contact ball bearing life. Bearings are generally manufactured through multiple processes such as forging, heat treatment, turning, grinding and assembly. The rationality, advancement and stability of each processing technology will also affect the life of the bearing. The heat treatment and grinding processes that affect the quality of the finished TIMKEN bearing often have a more direct relationship with the failure of the bearing. In recent years, research on the metamorphic layer of bearing working surface shows that the grinding process is closely related to the bearing surface quality.

1, pay attention to the installation of the bearing

Whether the bearing is installed correctly affects accuracy, life and performance. Therefore, the design and assembly department should fully study the installation of bearing products. I hope to install according to the operating standards. The items of the job standard are usually as follows:

(1) cleaning the bearing and bearing related components;

(2) Check the size and finishing of the connected components;

(3) installation;

(4) Inspection after installing the bearing;

(5) Supply lubricant. Carefully do the five steps of bearing installation

2, alignment, straightening

     After the TIMKEN bearing is installed, alignment may result in additional loads, friction and vibration of the bearing if not carefully aligned. These can accelerate fatigue and reduce the service life of bearing products 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.

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Analysis of the Influence of TIMKEN Micro-bearing Lubrication Method on Performance

When testing the advantages of chrome steel and stainless steel as TIMKEN bearing materials, they were found to not only have rust preventive effects. Chrome steel is the most common miniature bearing material. It is harder than stainless steel, so it lasts longer. However, at higher temperatures, its performance is not good.

At a high temperature of 120C, it undergoes tremendous deformation and the load is reduced. It can withstand a high temperature of 150C, but an instantaneous temperature of 150C or higher will reduce the life of the imported bearings. The heat treatment can subject the bearing to an elevated temperature of 170C.

The purpose of lubrication of TIMKEN bearings is to reduce internal friction and wear of the bearings, to prevent sticking, and the lubricating effect is as follows.

(1). Reduce friction and wear.

In the mutual contact portion of the ferrule, the rolling element and the retainer constituting the micro bearing, metal contact is prevented, and friction and wear are reduced.

(2). Extend fatigue life.

The rolling fatigue life of the bearing is prolonged when the rolling contact surface is well lubricated during rotation. Conversely, if the oil viscosity is low and the thickness of the lubricating oil film is not good, it is shortened.

(3). Discharge friction heat, cooling

The circulation oil supply method or the like can be used to discharge heat generated by friction or heat from the outside to cool. Prevent the bearing from overheating and prevent the lubricant from aging itself.

(4). Other

There is also the effect of preventing foreign matter from entering the inside of the bearing or preventing rust and corrosion.

Lubrication method:

The lubrication method of TIMKEN bearings is divided into grease lubrication and oil lubrication. In order to make the miniature bearing function well, first of all, it is necessary to select a lubrication method suitable for the conditions of use and 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 and comparing the advantages and disadvantages of grease lubrication and oil lubrication.

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Reasons and maintenance methods affecting the service life of IKO self-aligning ball bearings

First of all, the bearing size is limited.

Self-aligning ball bearings usually have limited installation space. In most cases, it is based on mechanical design or other design limitations. The type and size of the IKO bearing is therefore based on the decision to choose the bearing diameter. Therefore, the main dimension tables of standard self-aligning ball bearings are sized according to international standards.

In many forms of standard bearing sizes, it is best to use standard self-aligning ball bearings in mechanical equipment design, size, and direction are constantly changing. Normally, the basic load rating is shown in the size of the table. However, axial load and radial load can also be an important factor in selecting an appropriate self-aligning ball bearing. IKO bearings usually have a high load capacity and are subject to large vibration and shock loads when the size is quite long.

Second, the speed of the bearing.

The allowable speed is determined based on factors such as the type, size, accuracy, cage, load, lubrication, and cooling method of the self-aligning ball bearing. The IKO bearing table lists the speeds allowed for the standard accuracy of lubricating oil bearings and grease. In general, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are suitable for high speed applications.

Third, self-aligning ball bearing tolerances.

Self-aligning ball bearings are dimensionally accurate and rotationally accurate based on the International Organization for Standardization (ISO) and JIS standards. High precision, high speed machinery, recommended for five years or more accurate self-aligning ball bearings, deep groove ball bearings, angular contact ball bearings or cylindrical roller bearings for high machine running accuracy. Rigid, elastically deformed when the contact pressure of the ball and roller races is adjusted. Some machines require less elastic deformation. There is a small elastic deformation than a ball bearing roller bearing.

Maintenance of IKO bearings must also master the following:

1. Regularly check the use status, pay attention to whether there is abnormal sound and partial sharp temperature rise in the observation part;

2. Regularly or quantitatively add lubricating oil or grease as required;

3, according to the use of the vehicle, at least once every six months to completely replace the lubricant, and carefully check;

4. Inspection method under maintenance condition: clean the kerosene or gasoline under disassembly, carefully observe whether there is sliding or creeping phenomenon on the inner and outer cylindrical surfaces, whether there are flaking or pitting on the inner and outer raceway surfaces, whether the rolling elements and cages are Wear and deformation, etc., based on the comprehensive situation of IKO bearing inspection, to determine whether it can continue to use.

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Key requirements for grease filling during lubrication of FAG thin-walled bearings

For sealed thin-walled bearings, the production has been filled in with the appropriate grease and the seal is placed on the main unit to prevent grease leakage. Note that too little fat is likely to cause a lack of fat or dry friction, affecting life. Grease can cause excessive temperature rise. A large amount of grease leaks, not only pollutes the environment, but also wastes. Therefore, better FAG bearings are required to enter the thin-wall bearing grease amount to ensure adequate lubrication.

Lubrication friction: A resistance to mechanical friction that forms part of the surface of the film. Cooling temperature: Take away heat through oil circulation to prevent sintering. Clean: Clean the friction surfaces of the work surface and other materials produced by the metal by flowing oil. Sealed against leaks: reduces gas leakage and external contaminants. Corrosion: Adsorbs on the surface to prevent water, air, acids, harmful gases and contact areas. Buffer: A sharp rise, engine cylinder pressure, sudden increase in the piston, piston pin, connecting rod and crankshaft oil load can withstand the impact load buffer.

Grease lubrication refers to the direct application of grease between the moving surfaces of thin-walled bearings. However, the following five principles must be observed when entering grease into the raceway and sliding work surface of FAG bearings:

(1) Grease must penetrate the working surface of the thin-walled bearing and the internal clearance of the bearing, so that the grease can fully lubricate.

(2) A certain amount of grease should be retained on the working surface of the FAG bearing for a certain period of time, but it is necessary to prevent excessive loss of grease.

(3) The flow direction of the input and discharge of grease should be consistent with the sealing requirements, which is conducive to the discharge of invading dirt.

(4) Under the premise of ensuring good lubrication, minimize the amount of grease.

(5) Open the outlet hole at the end of the grease flow so that the newly added grease can squeeze out the old grease and ensure good lubrication. Special reminder, when lubricating grease for FAG bearings, pay attention to the operating temperature range of thin-wall bearing grease. If it is not in the proper temperature range, the effect will be counterproductive.

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