Bearing

1. Paired bearings must be installed in pairs according to the paired products, and cannot be assembled in any way;

 2. Before installation, check the dimensional accuracy and shape position tolerance of the shaft and bearing seat matched with the bearing to meet the requirements of the machine tool drawings and clean these surfaces;

 3. Check if the distance between the sides of the bearing seat cover is less than the total width of the bearing set. If this is not the case, there will be axial play in the main shaft;

4. When the bearing is heated on the induction heater or the heating plate, the temperature is 20~30°C higher than the ambient temperature;

5. Ensure that the paired bearings are oriented correctly. This is a paired bearing. Be sure to check the mark on the outer diameter of the outer ring of the bearing.

6. Adjust the high point on the inner and outer rings of the bearing so that the marks on the high points of the inner and outer rings are in the same position, ensuring that the load is distributed optimally between the bearings;

7. Before the bearing is heated, the lubricating grease should be added to the bearing to meet the performance of the spindle bearing. Generally, it can be 1/3~2/3 of the bearing space. No need to add more, it will cause heat; use a reasonable method to add grease. , so that the grease can be evenly distributed around the rolling elements of the bearing;

8. The bearing is cleaned of the anti-rust oil on the bearing with clean utensils and kerosene before adding the grease, and the bearing is dried to ensure the lubrication effect;

9. Use a torque wrench or other tool to lock the bearing according to the value of the medium preload.
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Bearing noise problem

1. From the measured radial clearance paper of the bearing, the maximum value of the three sets of clearance is obtained. When the clearance of the bearing is large, the bearing may be in use and may cause some noise due to the large clearance. Compared with deep groove ball bearings of the same inner diameter, cylindrical roller bearings have larger radial clearance values ​​for the same group. Therefore, it is recommended to use CN group clearance for cylindrical roller bearings used in general.

2. In the process of installation, such bearings often occur in the process of the outer component entering the inner ring raceway surface. Due to insufficient guidance, etc., the inner ring raceway surface or the roller surface may be scratched or scratched. It can also cause noise in the bearing.

3, the bearing in the process of adding grease, it is possible to bring some soft materials into the bearing raceway, these soft materials will scratch the raceway or roller surface, causing bearing noise.

It is recommended to replace the CN group clearance product. The installation process should be clean and properly installed. It is forbidden to hammer the bearing, clean the bearing and add grease. Check the correct use of the pump, etc. The correct measurement of the radial clearance of the bearing requires the use of a radial clearance gauge, simple measurement on the platform and easy measurement with a feeler gauge. Measurement using a lead wire method is not recommended. Bearing.
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