INA roller bearing maintenance is the most critical basic knowledge

Unexpected equipment can be stopped when the bearing is damaged. Even with hourly downtime, large losses in production can result from premature damage to the INA bearings, especially in capital-intensive production.
Why is the roller bearing damaged?
Bearings are precision parts, so they require a very cautious attitude when using them. That is, they use high-performance bearings. If they are used improperly, they can not achieve the expected performance and easily damage the INA bearings. Therefore, the following matters should be noted when using bearings:
    Contact fatigue failure
    Contact fatigue failure is one of the most common failure modes of various roller bearings, and it is the failure of the roller bearing surface caused by the repeated action of cyclic contact stress. Contact fatigue spalling on the surface of INA bearing parts is a process of fatigue cracking from initiation to propagation. The initial contact fatigue crack is first generated from the maximum orthogonal shear stress below the contact surface and then spreads to the surface to form pitting or flaking, the former being called pitting or pitting peeling; the latter being called shallow The layer peeled off. If the initial crack is generated at the junction between the hardened layer and the core, causing early peeling of the hardened layer, it is called hardening layer spalling.
    2. Adhesion and abrasive wear failure
    It is one of the most common failure modes for all types of bearing surfaces. The relative sliding friction between the INA bearing parts causes the continuous loss of surface metal to be called sliding wear. Continued wear will cause the size and shape of the part to change, the bearing fit clearance will increase, the working surface topography will deteriorate, and the rotation accuracy will be lost, so that the roller bearing will not work properly. The sliding wear form can be divided into abrasive wear, adhesive wear, corrosion wear, fretting wear, etc., the most common of which are abrasive wear and adhesive wear.
The life of a rolling bearing is defined by the number of revolutions (or the number of hours of operation at a certain speed). Bearings within this life are subject to initial fatigue damage (flaking or missing) on ​​any of the INA bearing rings or rolling elements. However, whether in the laboratory test or in actual use, it can be clearly seen that under the same working conditions, the appearance of the same roller bearing, the actual life is very different. In addition, there are several different definitions of the bearing "life", one of which is the so-called "working life", which means that the actual life that a bearing can reach before it is damaged is caused by wear and damage, usually not caused by fatigue, but Caused by wear, corrosion, seal damage, etc.

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Extending the service life of INA miniature bearings

    INA bearing surface is coated with anti-rust oil, you must carefully clean it with clean gasoline or kerosene, and then apply clean high-quality or high-speed high-temperature grease to install. The effect of cleanliness on micro bearing life and vibration and noise is very large. But we must remind you that the fully enclosed bearings do not need to be cleaned and refueled. 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. Different types of greases of different grades have different performances. The allowable rotation limits are different. Be careful when selecting.
    The performance of the grease is primarily determined by the base oil. Generally low viscosity base oils are 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, different brands of grease cannot be mixed, and even greases of the same thickener can have a bad influence on each other due to the different additives. When lubricating INA bearings, the more grease is applied, the better. When lubricating miniature bearings, the more grease is applied, the better. This is a common misconception.
1, 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 INA bearings. I hope to install according to the operating standards. The items of the job standard are usually as follows:
(1) Cleaning bearings and bearing related parts
(2) Check the size and finishing of the connected parts
(3) Installation
(4) Inspection after mounting the bearing
(5) Supply lubricant
2. Basic condition monitoring of bearings
During use, the basic external conditions of the INA 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.
3. Relubrication of the bearing
During operation, INA bearings require proper relubrication to perfect its performance. The method of micro-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.
4, the unloading of the bearing
When the bearing will reach its end of life, it should be replaced.
Although the INA bearing can no longer be used, correctly removing the original bearing and replacing the new bearing in time can promote the service life of the new bearing.
Excessive grease in the bearing and bearing chambers will cause excessive agitation of the grease, resulting in extremely high temperatures. How to install and remove Do not hammer the bearing end face and the non-stress face directly during installation. The micro 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 INA bearing to expand, making it easier to fall off.

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