Inspection of the deterioration method of SK bearing grease

NSK bearings will encounter various problems during use. Today we will find out how to test the deterioration of NSK bearing grease.

Grease is very critical in the use of NSK bearings. If a deteriorated grease is used, it will not only function as it should, but it will also damage the NSK bearing.

1 Oil flow observation method

Take two measuring cups, one of which is filled with the lubricating oil to be inspected, the other is placed on the table, and the measuring cup filled with lubricating oil is lifted off the table 30-40 cm and tilted to allow the lubricating oil to slowly flow to the empty cup. In the middle, observe the flow, the quality of the lubricating oil flow should be slender, even, continuous, if the oil flow suddenly and slowly, and sometimes there is a large flow, then the lubricant has deteriorated.

2 manual method

The lubricant is rubbed repeatedly between the thumb and the index finger. The better lubricant feels lubricated, less wear debris, and no friction. If you feel a large friction between the fingers, it means lubricating oil. There are many impurities inside, can not be reused, should be replaced with new lubricants.

3 lighting method

On a clear day, use a screwdriver to pry the lubricant at a 45-degree angle to the horizontal. Observe the sunlight and observe the oil droplets. Under the light, it can be clearly seen that there is no wear debris in the lubricating oil, which can continue to work. If the grinding debris is too much, the lubricating oil should be replaced.

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How to properly maintain SKF bearings

1, cleaning

When the SKF bearing is removed and inspected, the appearance record is first recorded by photography. In addition, confirm the amount of lubricant remaining and sample the lubricant before cleaning the SKF bearing.

a. The cleaning of the SKF bearing is carried out by rough washing and fine washing, and a metal mesh frame can be placed on the bottom of the used container.

b. When rough washing, remove the grease or adhesive with a brush or the like in the oil. At this time, if the SKF bearing is rotated in the oil, be careful that the rolling surface will be damaged by foreign matter or the like.

c. When fine washing, slowly rotate the SKF bearing in the oil, and it must be carried out carefully.

The cleaning agent generally used is a neutral non-aqueous diesel oil or kerosene, and a warm alkali liquid or the like is sometimes used as needed. Regardless of which cleaning agent is used, it is often filtered and kept clean. Immediately after cleaning, apply anti-rust oil or anti-rust grease to SKF bearings.

2, inspection and judgment

In order to judge whether the removed SKF bearing can be reused, it is important to check its dimensional accuracy, rotation accuracy, internal clearance, mating surface, raceway surface, cage and seal.

Regarding the inspection results, it can be judged by the SKF bearing or the SKF bearing.

The criteria for judgment vary depending on mechanical properties and importance, inspection period, and the like. SKF bearings must not be reused if they are damaged and must be replaced.

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