In order to prolong the service life of industrial bearings, attention should be paid to the maintenance and repair of industrial bearings. The contents include monitoring the operating status, replenishing or replacing lubricants, and regular disassembly inspections. The maintenance items during operation include the rotation noise, vibration, temperature, and the state of the lubricant of the bearing. 1. Bearing cleaning When disassembling the bearing for maintenance, first record the appearance of the bearing, confirm the residual amount of lubricant, and wash the bearing after sampling the lubricant for inspection. As the cleaning agent, gasoline and kerosene are generally used. The cleaning of the dismantled bearing is divided into coarse cleaning and fine cleaning, which are placed in the container respectively, and the bottom of the metal mesh is placed first, so that the bearing does not directly contact the dirt of the container. During rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing, so be careful. In the rough cleaning oil, use a brush to remove grease and adhesions. After it is roughly clean, transfer to the fine cleaning. Fine cleaning is to carefully clean the bearing while rotating in the cleaning oil. In addition, the cleaning oil should always be kept clean. 2. Bearing maintenance and judgment In order to judge whether the disassembled bearing can be used, it should be checked after the bearing is cleaned. Check the condition of the raceway surface, rolling surface and mating surface, the wear of the cage, the increase of bearing clearance, and the damage and abnormality irrelevant to the decrease of dimensional accuracy. For non-separable small ball bearings, hold the inner ring horizontally with one hand, and rotate the outer ring to check for smoothness. For separable bearings such as tapered roller bearings, the rolling elements and the raceway surface of the outer ring can be inspected separately. Because large bearings cannot be rotated by hand, pay attention to checking the appearance of rolling elements, raceway surfaces, cages, rib surfaces, etc. The higher the importance of the bearing, the more careful inspection is required. 3. Bearing lubrication The purpose of lubricating rolling bearings is to reduce the internal friction and wear of the bearing and prevent burning and sticking. The lubrication effect is as follows. (1) Reduce friction and wear. In the mutual contact parts of the rings, rolling elements and cages that constitute the bearing, metal contact is prevented, and friction and wear are reduced. (2) Extend the fatigue life. The rolling fatigue life of the bearing is extended when the rolling contact surface is well lubricated during rotation. Conversely, if the oil viscosity is low and the lubricating oil film thickness is not good, it will be shortened. (3) Discharge frictional heat and cooling. The oil circulation method, etc., can use oil to discharge heat generated by friction or heat from the outside, and cool it. Prevent the bearing from overheating and prevent the aging of the lubricating oil itself. (4) Others: It also has the effect of preventing foreign objects from invading the inside of the bearing, or preventing rust and corrosion. Lubrication method: The lubrication method of bearings is divided into grease lubrication and oil lubrication. In order to make the bearing function well, first of all, it is necessary to select a lubrication method suitable for the conditions of use and the purpose of use. If only lubrication is considered, the lubricity of oil lubrication is dominant. However, grease lubrication has the advantage of simplifying the structure around the bearing. Compare the advantages and disadvantages of grease lubrication and oil lubrication. 4. Bearing installation Whether the bearing is installed correctly affects the accuracy, life and performance. Therefore, the design and assembly department should fully study the bearing installation. It is hoped that the installation will be carried out according to the working standard. The items of the work standard are usually as follows: (1) Cleaning the bearings and bearing-related parts; (2) Checking the dimensions and finishing conditions of the related parts; (3) Installation; (4) Inspection after the bearings are installed; (5) Supplying lubrication agent. 5. It is hoped that the bearing packaging will be opened just before installation. General grease lubrication, no cleaning, direct filling with grease. Lubricating oil does not need to be cleaned in general. However, bearings for instruments or high-speed use should be cleaned with clean oil to remove the rust inhibitor coated on the bearings. Bearings with rust inhibitor removed are easy to rust, so they cannot be left unattended. Furthermore, bearings that have been sealed with grease can be used directly without cleaning. 6. The installation method of the bearing varies depending on the bearing structure, fit and conditions. Generally, since most of the shaft rotates, the inner ring needs an interference fit. Cylindrical bore bearings are usually pressed in by a press, or by a shrink-fit method. In the case of a tapered hole, install it directly on the tapered shaft, or install it with a sleeve. 7. When installing to the shell, there is generally a lot of clearance fit, and the outer ring has an interference amount, which is usually pressed in by a press, or there is a shrink fit method for installation after cooling. When dry ice is used as a coolant and shrink fit is used for installation, moisture in the air will condense on the surface of the bearing. Therefore, appropriate anti-rust measures are required. For more bearing technology, please pay attention to our company's official website: high temperature bearing http://
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