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What should be paid attention to when installing oil-free bearings

Author:admin   Date:2022-07-07
Oil-free bearings have the characteristics of high bearing capacity, impact resistance, high temperature resistance, and strong self-lubricating ability. Erosion and scour. Oil-free bearings are used in metallurgical continuous casting machines, steel rolling equipment, mining machinery, ships, steam turbines, water turbines, injection molding machines and equipment production lines. So, how to install oil-free bearings? Let's take a look!

1. It should be determined whether there are bumps, protrusions, etc. on the mating surface of the oil-free bearing shaft and shaft shell.

2. Check whether the oil-free bearing has dust or mold sand attached to the surface of the bearing shell.

3. If the oil-free bearing has minor bumps, protrusions, etc., it should be removed with oil grindstone or fine sandpaper.

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Load capacity

140N/mm²

Friction Coef

0.03~0.18

Temperature

-195℃~280℃

PV limit(dry)

4.3N/mm²·m/s

Speed limit

10m/s

PV limit(oil)

60N/mm²·m/s




4. In order to avoid bumps during installation, a small amount of lubricating oil should be applied to the surface of the shaft and the shaft housing. When installing the oil-free bearing on the shaft, force must be applied to the inner ring, and when installing the bearing on the bearing shell, force must be applied to the outer ring. When applying force to the bearing, be careful to make the force go down vertically and evenly, otherwise the bearing will be injured. For this reason, try to avoid partial hits as much as possible.

5. The retainer of the oil-free bearing and the sealing plate must not be forced. The installation method of using a hammer and a casing is a commonly used method, because it will damage the bearing, so do not hit it directly. Hit the sleeve with the sleeve in between. The hammer should strike lightly. In the mechanical structure, when the inner and outer rings are tightly fitted, a backing plate should be used, so that the force can be applied to the inner and outer rings at the same time. If only the inner ring is press-fitted, the force will be forced into the outer ring through the balls, thus causing scratches on the raceway surface. When installing a bearing with a large margin on the shaft, the method of heating the bearing to 80 to 90 degrees in clean oil to expand the inner diameter is widely used.

6. The hardness of oil-free bearings may be reduced due to overheating. Therefore, it must not exceed 100 degrees. At this time, the bearing must be suspended by steel wire, or placed on the wire guide, on the support plate, not on the bottom of the groove. When the bearing reaches the desired temperature (below 100 degrees), it should be taken out of the groove immediately and put into the shaft quickly. The bearing will shrink as the temperature drops, and sometimes there will be a gap between the shoulder and the end face of the bearing. Therefore, A tool is required to compress the bearing in the axial direction. Be sure to pay attention to these details when installing oil-free bearings.

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