In the process of using the bearing, especially when lubricating the bearing, pay attention to the amount of grease used. How to use lubricating grease accurately requires everyone to understand the movement of lubricating grease in the bearing 6316-2RS to ensure the stability of lubricating grease. The movement of the grease filled in the rolling bearing can be roughly divided into two stages as the bearing changes.
Different lubricating greases form different profiles in the bearings, and the traffic is different. It must form a relatively rough draft, and the running time is short. During long-term operation, the temperature of the self-aligning roller bearing is low and stable. This is a kind of It is an ideal lubricating grease, so it is very important for the channeling of the lubricating grease.
Under normal circumstances, the amount of grease filling in the bearing always exceeds the actual demand for direct lubrication, on the cage and in the cavity of the bearing cover, and forms a contour around the rolling elements. During this process, the bearing temperature rises rapidly due to the resistance of excess grease. Although most of the excess grease is squeezed out at the beginning of operation, and the grease squeezed in the raceway accessories may still be transferred and brought between the raceways by the rolling elements.
In the initial stage of the bearing operation, most of the grease is quickly (less than a minute) squeezed out of the raceway, and the grease accumulated in the bearing rotates with the rotation of the spherical roller bearing. was discharged. At this time, the temperature of the bearing continues to rise until the excess grease is discharged, which can be called the run-in phase of the grease. According to the quality of the grease in the bearing structure, the filling amount and other factors, this period may last for more than ten minutes. , and even several hours.
When lubricating anti-friction bearings, it may not be necessary to use a high pressure theory unless it is used very carefully. High pressure can damage bearings, waste grease, excessive grease can cause dangerous high temperatures and create an invisible environment around the bearing. In most applications, ball or roller bearings can be fully lubricated if the grease level is one-third to one-half of the bearing capacity. The excess will normally be wasted by being drained by the enclosure.
1. Are there any requirements for the installation surface and installation site?
If iron filings, burrs, dust and other foreign matter enter the self-aligning roller bearing, it will cause noise and vibration during the operation of the bearing, and even damage the raceway and rolling elements. Therefore, before installing the bearing, you must ensure that the installation surface and the installation environment are clean.
2. Must the bearing be cleaned before installation?
The surface of the bearing is coated with anti-rust oil, you must clean it carefully with clean gasoline or kerosene, and then apply clean high-quality or high-speed and high-temperature lubricating grease before installation and use.
The impact of cleanliness on bearing life and vibration noise is very large.
But we would like to remind you that fully enclosed bearings do not need to be cleaned and refueled.
3. How to choose grease?
Lubrication has an extremely important impact on the operation and life of imported bearings.
Here is a brief introduction to the general principles of selecting grease. Lubricating grease is made of base oil, thickener and additives. The performance of different types and different grades of the same type of grease varies greatly, and the allowable rotation limit is different. Be sure to pay attention when choosing.
The performance of grease is mainly determined by the base oil.
Generally, low-viscosity base oil is suitable for low temperature and high speed; high-viscosity base oil is suitable for high temperature and high load.
The thickener is also related to the lubricating performance, and the water resistance of the thickener determines the water resistance of the grease.
In principle, greases of different brands cannot be mixed, and even greases with the same thickener will have a bad influence on each other due to different additives.
4. When lubricating the bearing, the more grease the better?
It is a common misconception that more grease is better when lubricating bearings.
Excessive grease in spherical roller bearings and bearing chambers will cause excessive agitation of the grease, which will generate extremely high temperatures.
5. How to install and remove?
Do not directly hammer the end face and non-stressed surface of the spherical roller bearing during installation, and use a pressing block, sleeve or other installation tools to make the bearing evenly stressed.
If the installation surface is coated with lubricating oil, it will make the installation smoother.
If the fit interference is large, put the bearing in mineral oil and heat it to 90~100°C and install it immediately. When you encounter difficulties in disassembly, it is recommended that you use a disassembly tool to pull outwards and carefully spray hot oil on the inner ring. The heat will expand the inner ring of the bearing and make it easier to fall off.