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Working Principle Of Water Lubricated Bearing And Water Lubricated Bearing

Water Lubricated Bearing

Working principle of water lubricated bearing and water lubricated bearing

Water lubricated bearing is a kind of hardware accessories. I believe many people still have some understanding of the bearing. What is water lubricated bearing? What is the working principle of water lubricated bearing?

What is water lubricated bearing?

Water lubricated bearings are divided into phenol bearings, rubber bearings, ceramic bearings, graphite bearings, PTFE and other polymer bearings. The bearing is used directly in water without any sealing device. The bearing is lubricated by water and does not need lubricating oil or grease, eliminating the harm of water pollution.

Bearings are often used in flowing water, which can effectively control the bearing temperature rise, so as to have long service life, safety and reliability. Structurally, it is suitable for horizontal axis, vertical axis and inclined axis.

It is mainly used for large industrial water pumps, power plants, nuclear power plants, ships, water turbines, wind power generation, petrochemical industry, light chemical and food machinery, sewage treatment, waterworks, water conservancy pump stations, mining machinery and engineering machinery, valves, mixers and other fluid machinery.

Working principle of water lubricated bearing:

Working Principle Of Water Lubricated Bearing And Water Lubricated Bearing

Finishing steps after NSK precision bearing

Under certain load, the number of revolutions or hours before pitting corrosion of NSK precision bearing is called bearing life.

Due to different manufacturing accuracy and material uniformity, even if the same batch of bearings with the same material and size are used under the same working conditions, their service life is also different. When the statistical life is 1 unit, the relative life of drunk length is 4 units, the drunk short is 0.1-0.2 units, and the ratio of drunk length to drunk short life is 20-40 times.

In order to determine the life standard of NSK precision bearing, the bearing life and reliability are linked.

The same batch of bearings of the same specification (model, material and process) are used under the same working conditions. 90% of the bearings do not produce pitting corrosion. The number of revolutions or hours experienced is called the rated life of the bearing.

In order to compare the bearing capacity against pitting corrosion, the large load that the bearing can bear when the rated life is 1 million RPM (106) is the basic dynamic load, expressed in C.

In other words, the reliability of bearing without pitting failure is 90% at NSK precision bearing rated dynamic load C and 1 million RPM (106). The greater the value of C, the higher the bearing capacity.

When the grindstone surface is in contact with the rough raceway surface

due to the small contact area and large stress per unit area, the “reverse cutting” effect of the bearing workpiece will be affected under a certain pressure, and some abrasive particles on the grindstone surface will fall off, resulting in new wear and debris. At the same time, the bumps on the surface of bearing workpiece are quickly cut, and the bumps and grinding metamorphic layer are removed by cutting and reverse cutting.

This stage is called the cutting stage, in which most of the remaining metal is removed.
With the continuous processing, the surface of NSK precision bearing workpiece is gradually ground. At this time, the contact area between the grindstone and the workpiece surface increases, the pressure per unit area decreases, the cutting degree decreases and the cutting capacity decreases.

At the same time, the pores on the surface of the grindstone are blocked and in a semi cutting state. This stage is called the half cutting stage of bearing finishing. In the half cutting stage, the cutting marks on the surface of the bearing workpiece become shallow and appear dark luster.

This is a drunk step in the Superfinishing of NSK precision bearings. With the gradual leveling of the workpiece surface, the contact area between the grindstone and the workpiece surface further increases. The grindstone surface and the bearing workpiece surface are gradually separated by the lubricating oil film. The pressure per unit area is very small and the cutting effect is reduced.

When drunk, the cutting will stop automatically. This stage is called the end stage. In the finishing stage, there is no cutting trace on the workpiece surface, and the bearing presents a bright finished luster.