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Disassembly method and maintenance of rolling bearings

by:JNSN     2021-12-26
Regular inspection or replacement of parts requires disassembly of bearings. Generally, shafts and bearing boxes are almost always used, and bearings are often used. Therefore, in the structural design of the machine, consideration should be given to not damaging the bearing, shaft, bearing box and other parts when disassembling the bearing. At the same time, appropriate disassembly tools should be prepared. When disassembling the ferrule with interference fit, only the pulling force can be applied to the ferrule, and the ferrule shall not be pulled by the rolling element. The disassembly tool for bearing model query is the most suitable tool press for disassembling bearings. Use a press to disassemble the bearing. Carefully check whether the lifting part of the press and the axis of the disassembled 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 mating surface (usually the mating surface of the outer ring and the housing aperture), and then use a press to press the bearing out of the tightly-fitting surface. If the bearing will be used again after being removed, it is never allowed to transmit the disassembly force through the rolling elements, otherwise the rolling elements and the raceway of the ferrule will be crushed. When cleaning and dismantling the bearing for inspection, first use photography and other methods to make a record of the appearance. In addition, confirm the amount of remaining lubricant and sample the lubricant before cleaning the bearing. The cleaning of the bearing can be divided into rough cleaning and fine cleaning, and a metal mesh rack can be placed at the bottom of the used container. ·For rough washing, use a brush to remove grease or adhesions in oil. If the bearing is rotated in oil at this time, be careful that the rolling surface may be damaged by foreign matter. ·Slowly rotate the bearing in oil during fine washing, and must be carried out carefully. Commonly used cleaning agents are neutral non-water-containing diesel or kerosene, and sometimes warm lye etc. are used as needed. No matter what kind of cleaning agent is used, it must be filtered frequently to keep it clean. After cleaning, immediately apply anti-rust oil or anti-rust grease on the bearing. The maintenance of the bearing enables the bearing to give full play to and maintain its due performance for a long time. Regular maintenance (regular inspection) must be done in earnest. Through appropriate regular inspections, it is very important to improve productivity and economic efficiency to detect faults early and prevent accidents before they occur. Inspection and Judgment In order to judge whether the removed bearing can be reused, it is necessary to check its dimensional accuracy, rotation accuracy, internal clearance and matching surface, raceway surface, cage and seal ring. Regarding the inspection results, it can be judged by those who use inertial bearings or those who are proficient in bearings. The criteria for judging are different according to the mechanical performance and importance, and the inspection period. If the following damage occurs, the bearing must not be reused and must be replaced. Fracture of bearing components and peeling of defective raceway surface or rolling surface. Bearing fault identification method can identify or predict whether the bearing is malfunctioning without disassembling inspection, which is very important to improve productivity and economy. The main recognition methods are as follows: Recognition by voice recognition by voice requires a wealth of experience. It must be fully trained to be able to distinguish between bearing sounds and non-bearing sounds. For this reason, the work should be done by professionals as much as possible. You can clearly hear the sound of the bearing with a listening device or a listening stick attached to the shell. Recognition by working temperature This method is a comparative recognition method and is limited to occasions where the operating state is not very changed. For this reason, the temperature must be continuously recorded. When a fault occurs, the temperature will not only increase, but also irregular changes. It is appropriate to use this method together with the voice recognition method. Recognition by the state of the lubricant. The lubricant is sampled and analyzed, and judged by the degree of contamination and whether foreign matter or metal powder has been mixed in. Recognition by vibrometer is used to judge the use of bearings by vibrometer. This method is generally used in the paper industry. Some experience should be accumulated in actual work. This method is particularly effective for bearings that cannot be observed close or large bearings.
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