Cleaning, inspection and damage judgment of SKF deep groove ball bearings

1, the cleaning of the bearing
When disassembling the SKF deep groove ball 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 SKF deep groove ball 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 SKF deep groove ball bearing while rotating 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 disassembled SKF deep groove ball bearing can be reused, it is necessary to check after the bearing is cleaned, carefully check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, and the SKF deep groove ball bearing clearance. The increase and the presence or absence of damage and abnormality regarding the decrease in dimensional accuracy. 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 SKF deep groove ball 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 the following defects are not available, the new SKF deep groove ball bearings must be replaced:
(a) cracks or notches on any of the inner ring, the outer ring, the rolling elements, and the cage;
(b) rupture on any of the ferrules and rolling elements;
(c) Significant jams on the raceway surface, ribs and rolling elements;
(d) the cage is worn significantly or the rivet is significantly slack;
(e) There is rust and injury on the raceway surface and the rolling elements;
(f) There are severe indentations and marks on the raceway surface and rolling elements;
(g) The inner diameter of the inner ring or the outer diameter of the outer ring has obvious creep;
(h) discoloration due to heat;
(i) Bearings sealed with grease, the seal or dust cover is damaged.

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Importance of lubrication for IKO bearings

1. The oil bath of the bearing is smooth
Smooth oil bath is a common smooth way in imported bearings, suitable for the smoothness of low and medium speed bearings. The IKO bearing is partially immersed in the groove, the smooth oil is brought up by the rotating bearing parts, and then flows back to the oil groove. The oil level should be slightly lower than the center of the lowest rolling element.
2. The oil drop of the bearing is smooth
The drip smoothness is suitable for the bearing parts that need to be quantitatively supplied with smooth oil. The amount of oil dripping is preferably every 3-8 seconds, and excessive oil quantity will cause the bearing temperature to increase.
3. The circulating oil of the bearing is smooth
The oil is pumped to the bearing components by an oil pump, and then filtered and cooled by the smooth oil after the IKO bearing. Because the circulating oil can take away a certain amount of heat and cool the bearing, this method is used for bearing parts with higher rotational speed.
4. The spray of the bearing is smooth
The use of boring shrinking air is mixed with smooth oil through a sprayer to create an oil mist. In the radial bearing, the air flow can effectively cool the bearing and prevent the intrusion of impurities. This method is suitable for the smoothness of high speed and low temperature bearing components.
5. Smooth emission of the bearing
The low pressure oil is injected into the bearing through the nozzle by the oil pump, and the oil injected into the bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at high speed, the rolling element and the cage also cause airflow around the surrounding air at a relatively high rotational speed. It is difficult to send the smooth oil to the bearing in a smooth manner. In this case, it is necessary to spray the smooth oil with low-pressure radiation. In the bearing, the position of the nozzle should be placed between the inner ring and the center of the cage.
Different IKO bearing greases are not the same in the contours of the bearings. It is necessary to form a contour that is relatively straightforward. The running time is short. In the long-term operation, the bearing temperature is low and stable. This is an ideal one. Grease, so it is especially important for the grease.
Some so-called eddy-flow greases are not easy to form contours, and even if they are contoured, they are easy to collapse. At this time, the excess grease repeatedly returned to the raceway is in a state of being strongly stirred for a long time, and the bearing torque is large and the temperature is high. Unbalanced, noise may also be generated, and grease is also prone to deterioration and loss.
Treatment of elevated bearing temperature

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