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Jinan Tianshan Seiko Bearing Co., Ltd. introduces the bearing repair and cleaning knowledge. When disassembling the bearing for repair, first record the bearing appearance, confirm the residual amount of lubricant, and after sampling the lubricant for inspection, wash the bearing. As a cleaning agent, gasoline and kerosene are used in general. Fine washing is performed by carefully rotating the bearing while rotating it in the cleaning oil. In addition, the cleaning oil should always be kept clean.
1, the 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 then wash the bearing after sampling the lubricant for inspection. As a cleaning agent, gasoline and kerosene are commonly used.
The cleaning of the removed bearing is divided into coarse cleaning and fine fine washing. In the container, the metal mesh bottom is placed first, so that the bearing does not directly contact the container. When 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 clean the bearing while rotating it in the cleaning oil. In addition, the cleaning oil should always be kept clean.
2. Inspection and judgment of bearings
In order to judge whether the removed bearing can be reused, check the bearing after cleaning, carefully 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 whether there is dimensional accuracy. Falling damage, abnormality. For non-separable ball bearings, use one hand to support the inner ring and rotate the outer ring to check if it is smooth.
Separate bearings such as tapered roller bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring.
Because large bearings cannot be rotated by hand, pay attention to the appearance of rolling elements, raceways, cages, ribs, etc. The higher the importance of bearings, the more careful inspection is required.
The judgment of whether or not to reuse is determined in consideration of the degree of bearing damage, mechanical properties, importance, operating conditions, and the period until the next inspection. However, if there are the following defects, they can no longer be used, and new bearings must be replaced.
1. There are cracks or gaps in any one of the inner ring, the outer ring, the rolling elements and the cage;
2. There is a break on any one of the ferrule and the rolling element;
3. There are significant card injuries on the raceway surface, the ribs and the rolling elements;
4. The cage is worn significantly or the rivet is significantly slack;
5. There are rust and injuries on the raceway surface and rolling elements;
6. There are serious indentations and marks on the raceway surface and rolling elements;
7. There is obvious creep in the inner diameter surface of the inner ring or the outer diameter surface of the outer ring;
8. The discoloration caused by heat is obvious;
9. The bearing sealed with grease, the seal ring or the dust cover is obviously damaged.
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