In order to maintain the original performance of the bearing in a good condition for as long as possible, it is necessary to maintain, repair, and prevent accidents, ensure the reliability of operation, and improve productivity and economy. The operating standards for the maintenance of the corresponding mechanical operating conditions are carried out on a regular basis. The content includes monitoring of operating conditions, replenishment or replacement of lubricants, and periodic disassembly inspections. As a maintenance item during operation, there are angular rotation of the ball bearing, vibration, temperature, state of the lubricant, and the like.
Cleaning of the bearing: When disassembling the lower bearing for inspection, first record the appearance of the bearing, confirm the residual amount of the lubricant, and wash the bearing after sampling the lubricant for inspection. As a cleaning agent, gasoline and kerosene are commonly used. The cleaning of the removed bearings is divided into coarse cleaning and fine cleaning. They are placed in the container respectively, and the metal mesh bottom is placed first so that the bearing does not directly contact the container. In rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash. Fine washing is to carefully rotate the bearing while rotating it in the cleaning oil. In addition, the cleaning oil should always be kept clean.
Bearing inspection and judgment: In order to judge whether the removed bearing can be used, it should be checked after the angular contact ball bearing is cleaned. Check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of the bearing clearance, and the damage and abnormality that are irrelevant in dimensional accuracy. For non-separable miniature ball bearings, use the inner hand to support the inner ring and rotate the outer ring to check if it is smooth.
Separate bearings such as angular contact ball bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring. Large bearings cannot be rotated by hand. Pay attention to the appearance of rolling elements, raceways, cages, and ribs. The higher the importance of bearings, the more careful inspection is required. The reason for the overheating of the bearing may be that the installation is not correct. The installation of the skew may cause the ball to not roll in the correct position of the bearing raceway, or even cause the axial force of the larger ball surface and the inner race of the bearing seat and the outer race stop, resulting in The bearing is overheated. There is another possibility that the shaft diameter and the bearing housing hole are not measured or the mating surface roughness is not up to the standard requirement, resulting in an excessive interference fit, causing the bearing race to be greatly squeezed, resulting in the diameter of the bearing itself. The reduction of the clearance makes the angular contact ball bearing difficult to rotate, generates heat, and the wear is intensified or stuck. In severe cases, the inner and outer races of the bearing are installed.
The anti-friction bearings in all bearings basically contain two hardened steel rings, a plurality of hardened balls or rollers, and a separate carrier or cage for separating the rollers or rollers. These types are divided into many categories in use. Some types, such as needle-like column bearings, may have no inner ring and the rollers move directly on the hardened shaft.
In practice, it is necessary to use more than a certain amount of grease. When the required torque is low, only a very small amount of grease is required to complete the lubrication of the bearing. When the speed is very low and the HRB bearing is exposed to dust or moisture, the bearing may almost fill up. Angular contact ball bearings typically require more frequent lubrication under high speed and high temperature conditions than would normally be the case.
