When disassembling the SKF bearing for maintenance, first record the appearance of the SKF bearing, confirm the remaining amount of lubricant, and after sampling the lubricant for inspection, wash the bearing. As a cleaning agent, gasoline and kerosene are commonly used.
The cleaning of the removed imported bearings is divided into rough cleaning and fine and fine cleaning, respectively, in the container, first put a metal mesh bottom, so that SKF bearings do not directly contact the dirt of the container. During rough cleaning, if the SKF bearing is rotated with dirt, it will damage the rolling surface of the bearing, so care should be taken. In the rough cleaning oil, use a brush to remove grease and adhesions. After it is roughly clean, switch to fine cleaning.
Fine washing is to clean the SKF bearing carefully while rotating it in the cleaning oil. In addition, the cleaning oil should always be kept clean.
In order to judge whether the disassembled SKF bearing can be used again, it is necessary to check after the bearing is cleaned. The state of the raceway surface, rolling surface, mating surface, the wear of the cage, the increase of SKF bearing clearance and whether there is any Damage or abnormality due to reduced dimensional accuracy. For non-separable small ball bearings, use one hand to support the inner ring horizontally, and rotate the outer ring to confirm whether it is smooth.
Separate SKF bearings such as tapered roller bearings can separately inspect the rolling elements and raceway surfaces of the outer ring. Because large imported bearings cannot be rotated by hand, pay attention to checking the appearance of rolling elements, raceways, cages, and ribs. The higher the importance of SKF bearings, the more careful inspection is required.
Once the final value of the required rated load is determined, you must consider the external dimensions required for SKF bearing installation, including the installation and fixing of SKF bearings considered here. And the size of the shaft that matches the bearing with the required load rating. These factors help determine the bearing structure and size, and can also exclude certain imported bearing types. In some cases, due to space constraints, the choice is eliminated even before the rated load is determined.
For example, if SKF bearings are very narrow, ball bearings are the only type that can work here. Or, if you must use a bearing housing with a very small diameter, you need to install two or more roller bearings on the same shaft to achieve sufficient load ratings.
When the size of the shaft is very different from the required SKF bearing load rating, another common contradiction arises. If the shaft is large but the load is light, even if the required rated load is small, an expensive, high-rated large SKF bearing must be proposed. In this case, it is best to contact the bearing manufacturer in order to propose the most economical and effective solution.
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Basic working conditions. Assuming that the SKF bearing is applied to the reducer, the imported bearing must support one end of a shaft with a diameter of about 25mm, and a spur gear is installed on the shaft.
Working cycle and load of SKF imported bearings. The analysis of the gear force and the working cycle of the transmission show that the radial load of the bearing in about 3/4 of the time is 1780N, and the speed is 11000r/min. In 1/4 of the running time, the SKF bearing bears The radial load is 890N, and the speed is 3500r/min. Good positive meshing produces almost no axial force, and there is no oblique meshing or other effective axial component forces. It is estimated that the maximum axial force in both directions is 89N, and the maximum vibration force is 89N.
Size limit. Due to the limitation of the internal design of the reducer, the maximum outer diameter of the SKF bearing is allowed to be 70mm, the maximum calculated disturbance is 6, and the maximum position is 0, 0015. Spherical bearings are not required.
Surroundings. The lubrication of SKF bearings is the same as meshing lubrication: oil is sprayed from a large oil tank, and the maximum expected temperature is 140F.
Reliability. SKF bearings must have a good reliability for continuous operation, and a reliable failure rate of 8% is adopted.