Treatment method of heating phenomenon during operation of roller bearing

If there are bumps, rust layers, wear debris, sand, dust, and soil on the assembly surface of the bearing and its mating parts, the bearing device is difficult to form and the assembly position is incorrect; the other is that these attachments constitute abrasive and easy The working appearance of the abrasion roller bearing affects the assembly quality. Therefore, the appearance of the journal, the housing hole of the bearing housing, the end face of the shoulder, and the matching appearance of the connecting parts such as bushings, washers, end caps, etc. should be carefully inspected before the installation. If there is a rust layer, it can be filed off with a fine file and polished with a fine emery cloth. At the same time, the surface of the bearing assembly and the attachments on the connecting parts should be cleaned.

Precautions for the use of bearings: INA bearings are delicate parts, and their use must be carefully stopped accordingly. No matter how high-performance bearings are used, if they are used improperly, the expected high performance will not be obtained. Precautions for the use of bearings are as follows:

⑴. Keep the bearing and its surroundings clean. Even small dust invisible to the eyes will affect the roller bearing. Therefore, it is necessary to keep the surrounding area clean to prevent dust from invading the bearing.

⑵. Use it carefully and carefully. In use, a strong impact on the bearing will cause scars and indentations, which will be the cause of the accident. In severe cases, cracks and breaks may occur, so be careful.

⑶. Use appropriate operating tools. To prevent substitution with existing tools, appropriate tools must be used. Such as special sleeves, presses, etc.

⑷. Pay attention to the corrosion of the bearing. When handling INA bearings, sweat on your hands can become a cause of rust. Pay attention to the operation with clean hands, it is best to wear gloves as much as possible.

⑸. Before the preparation of the device is completed, do not unpack the bearing to avoid contamination.

The life of the roller bearing is more sensitive to the load than to the speed. Therefore, for the multi-stage drive shaft, if possible, the larger deceleration should be placed in the later stage; for the main shaft bearing, if possible, the external load point of action should be properly distributed. The space between the bearing fulcrum and the bearing fulcrum is trying to reduce the load of the spindle bearing, and the load transmitted to the spindle bearing is stable, to prevent shock and vibration, which requires the shape and position of the bearing device to be accurate enough, and the bearing clearance The matching and selection are correct, and the accuracy of the bearing device is good.

The shaft parts of the machine tool, especially the main shaft, are generally assembled with bearings or sliding bearings and rotate at a high speed, sometimes generating high heat. If this phenomenon is not cleaned up in time, it will cause the bearing to overheat and increase the temperature of the corresponding parts of the machine tool to produce thermal deformation. In severe cases, the main shaft and the tailstock will not be equal in height. This will not only affect the accuracy and processing accuracy of the machine itself, but also Burn out the bearing. The reason for the heating of the roller bearing and its cleaning method are shown in Table 1.

　　The cause of bearing heating and its cleaning method

　　1. Reason: low bearing accuracy. Method: select bearings with regular accuracy grades

　　2. Reason: the spindle is bent or the box hole is not concentric. Method: repair the spindle or box

　　 3. Reason: The belt is too tight. Method: Adjust the belt to make it tight.

　　4. Reason: poor smoothness method: choose smooth materials of regular grades and clean them properly

　　 5. Reason: Low assembly quality Method: Improve assembly quality

　　6. Reason: Bearing inner and outer shell running circle method: Changing the bearing and related wear parts

　　7. The axial force is too large. Method: cleaning and adjusting the gap of the sealing ring should be between 0.2～0.3mm, correct the diameter of the impeller equalization hole and check the static equalization