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Disassembly method and maintenance of rolling bearing

by:JNSN     2022-03-13
Regular inspection or replacement of parts requires disassembly of the bearing. Usually the shaft and the bearing housing will continue to be used almost, and the bearing will often continue to be used. Therefore, when disassembling the bearing, it should be considered in the structural design of the machine, so as not to damage the bearing, shaft, bearing box and other parts, and at the same time prepare appropriate disassembly tools. When removing a ferrule with an interference fit, only the pulling force can be applied to the ferrule, and the ferrule cannot be pulled through the rolling elements. SKF Bearing Model Inquiry Dismantling Tool The most suitable tool press for bearing dismantling. Use a press to remove the bearing. Carefully check whether the lifting part of the press and the axis of the removed bearing are perpendicular to each other. In addition, there are some simple manual bearing removal tools, such as pullers, which are also very convenient to use. The disassembly method of cylindrical bore bearings For non-separable bearings, first remove the bearing from the loose fitting surface (usually the fitting surface between the outer ring and the housing bore), and then use a press to press the bearing out from the tight fitting surface. If the bearing will be used again after dismantling, the dismounting force must not be transmitted through the rolling elements, otherwise the rolling elements and the raceway of the ring will be crushed. When cleaning and removing the bearing for inspection, first use photography and other methods to make a record of the appearance. Also, confirm the amount of remaining lubricant and sample the lubricant before cleaning the bearing. The cleaning of the bearing is divided into coarse cleaning and fine cleaning, and a metal mesh frame can be placed at the bottom of the container used. For rough washing, remove grease or build-up with a brush, etc. in oil. At this time, if the bearing is rotated in oil, be careful that the rolling surface may be damaged by foreign matter or the like. When fine cleaning, slowly rotate the bearing in oil, which must be done carefully. The commonly used cleaning agent is neutral non-water diesel oil or kerosene, and sometimes warm lye is also used as needed. Whatever cleaning agent is used, it should be filtered frequently to keep it clean. After cleaning, apply anti-rust oil or anti-rust grease to the bearing immediately. The maintenance of bearings enables NSK bearings to give full play to and maintain their proper performance for a long time. Regular maintenance (regular inspection) must be done effectively. Early detection of failures and prevention of accidents through appropriate periodic inspections are important for improving productivity and economy. Inspection and Judgment In order to judge whether the removed bearing can be reused, it is necessary to focus on checking its dimensional accuracy, rotation accuracy, internal clearance and mating surface, raceway surface, cage and sealing ring. The inspection results can be judged by those who use inertia bearings or those who are proficient in bearings. Judgment criteria vary depending on mechanical properties and importance, inspection cycles, and the like. In case of the following damage, the bearing shall not be reused and must be replaced. Fractures of bearing parts and peeling of defective raceways or rolling surfaces Bearing fault identification methods can identify or predict whether the bearing in operation is faulty without disassembly inspection, which is very important to improve productivity and economy. The main recognition methods are as follows: Recognition by sound Recognition by sound requires extensive experience. Sufficient training is required to recognize bearing versus non-bearing sounds. For this reason, it should be done by professionals as much as possible. The sound of the bearing can be clearly heard by attaching a listening device or a listening stick to the housing. Identifying by working temperature This method is a comparative identification method, and is only used in occasions where the operating state does not change much. For this, continuous recording of the temperature is necessary. In the event of a failure, the temperature not only increases, but also varies irregularly. It is advisable to use this method together with the voice recognition method. Identification by the state of the lubricant The lubricant is sampled and analyzed, and the degree of contamination and the presence of foreign matter or metal powder are judged. Identification by vibrometer The use of the bearing is judged by the vibrometer, which is generally used in the paper industry. Some experience should be accumulated in practical work. This method is especially effective for bearings or large bearings that cannot be viewed closely.
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