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NTN bearing various failure causes and matters needing attention

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The appearance of the NTN bearing device and the parts it cooperates with; if there is a bump, rust layer, wear debris, sand, dust and soil; one bearing device is difficult; the device orientation is incorrect, and the two objects constitute the abrasive, Easy to wear the outer surface of the bearing; affect the quality of the device; therefore; the front of the device should be the appearance of the journal, the housing shell hole, the shoulder end face, and the joint parts such as bushings, washers, end caps, etc.; carefully check If there is a rust layer; it can be finely smashed; the fine sand cloth is used for light; together, the external appearance of the bearing device and the attachments on the connecting parts are also removed.
The application of NTN bearings is concerned with the fact that rolling bearings are fine parts; their application must be carried out in a stable manner. No matter how high-performance bearings are used, if they are not used properly, they will not achieve the expected high performance. The following matters are as follows:
(1). Adhere to the bearing and its surrounding sanitation. Even small dust that can't be seen by the eyes will affect the bearing. Therefore, it is necessary to adhere to the surrounding sanitation; so that the dust does not invade the bearing.
(2). Use it cautiously. In the application, it will give a strong impact on the bearing; it will cause scars and indentations; it will be the cause of the incident. Under severe conditions; it will crack and crack; so it is necessary to pay attention.
(3). Use the right things to do. Avoid replacing them with existing ones; it is necessary to use the right things, such as special sleeves, presses, etc.
(4). Pay attention to the corrosion of the bearing. When operating the bearing; the sweat on the hand will become the cause of rust. Pay attention to the operation with clean hands; best put gloves as much as possible.
(5). Do not disassemble the bearing packaging until the device preparation work is completed; avoid contamination.
1. Selection and control of shaft and NTN bearing chambers: NTN bearings should be converted to sensitive and unobstructed after being pressed into NTN bearings. If there is a significant change in insensitivity; the scale of the shaft is too large; If the NTN bearing is pressed into the shaft and the hand is changed by a significant "sand" feeling, it may be that the shaft is too large or the roundness of the shaft is not good. Therefore, when the shaft and the NTN bearing chamber are operated, Control the roundness; many domestic manufacturers only control the public service; there is no control on the roundness.
2, NTN bearing device method: because NTN bearing is a high-precision product; if the device is not appropriate, it is very simple to damage the NTN bearing channel; cause NTN bearing damage. NTN bearing should have a special mold in the device; can not be hit casually When pressing the shaft, only a small circle of force is applied; when the large circle is pressed, only a large circle of force is applied. When the device is required, the air pressure or hydraulic pressure is required; when pressing, the upper and lower touches are outside the horizontal condition; if there is a skew, the NTN will be incurred. The bearing channel is damaged by the force; the NTN bearing is caused to sound.
3. Avoidance of foreign objects in the device: When the NTN bearing is dynamically balanced on the rotor, the iron filings generated during dynamic balancing are easily entered into the NTN bearing; therefore, the best is to balance the NTN bearing before loading. Some manufacturers want to install Convenience; some oil or grease is applied to the NTN bearing chamber for smoothing; however, it is often difficult for the operator to control the amount; if oil or grease is accumulated in the NTN bearing chamber; it is very simple along the NTN bearing transition. The shaft enters the inside of the NTN bearing. The NTN bearing chamber is best not to be oiled or greased; if it is not painted, it must be handled in the NTN bearing chamber.
4, the prevention of paint rust: paint rust is characterized by multiple seals in the motor; the sound of the motor is very good when the device is installed; but after some time in the warehouse; the abnormal noise of the motor is very large; remove the NTN bearing There are severe rusting appearances. Many manufacturers have considered it to be a problem of NTN bearings; through our constant publicity; now the motor factory has realized that it is the primary problem of insulating varnish. The problem is mainly due to the evaporation of acidic substances from the insulating varnish. Corresponding temperature and humidity constitute a corrosive substance; the NTN bearing channel is corroded and incurs damage to the NTN bearing. This problem can only be achieved by selecting a good insulating varnish;
The lifespan of NTN bearings is closely related to the production, installation and operation; it is necessary to do well in every link; in order to make NTN bearings in the best working condition; then extend the service life of NTN bearings.

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