SKF bearing grease selection considerations

In order to better play the best condition of the bearing, the choice of SKF bearing grease is directly related to the stable operation of the equipment. The choice of bearing grease must be considered from the following aspects:

1. Anti-rust performance

The rust inhibitor is preferably insoluble in water. Grease should have good adhesion, and the grease used in the bearing must have anti-rust effect. And can form a layer of oil film on the steel surface.

2. Mechanical stability

Causes a leak. In normal operation, the grease will become soft during machining. Grease will be trapped inside the bearing by the bearing housing. If the mechanical stability of the grease is insufficient, during the operation, the structure of the soap of the grease will mechanically disintegrate, causing the grease to be destroyed, thereby losing the lubricating effect.

3. Oil seal

Oil seals are a necessary barrier to maintain bearings and lubricants from external contamination during SKF bearing operation. No matter whether debris or moisture can penetrate into the bearing to prevent damage. Proper device maintenance is an important factor in maximizing the service life of bearings. At the same time, it is necessary to pay attention to the cleanliness of the bearing, the correctness of the bearing selection and the selection of appropriate equipment and maintenance tools. In addition, the bearings must be protected from contaminants and moisture and ensure proper installation and lubrication. Therefore, the design of the bearing arrangement, the condition of the oil seal, the type of lubricant and the lubrication cycle, and even the special support play the same and important role.

4. Mixed grease

If two incompatible greases are mixed, never mix incompatible greases. Usually, the consistency will become soft, and in the end, the bearing may be damaged due to the easy loss of grease. If you don't know which grease the bearing originally used, you must completely remove the old grease inside and outside the bearing before adding new grease.

5. Classification of oils and fats

SKF bearings that operate at a certain temperature affected by the operating temperature must be selected to have the correct consistency and good lubrication at the same temperature. Grease is manufactured in a wide range of operating temperatures and can be broadly classified into low temperature, medium temperature and high temperature greases. At the same time, it is mainly distinguished according to temperature and working conditions: grease can be classified according to its allowable operating temperature. One type of grease is called extrusion-resistant or extrusion-resistant and adds molybdenum disulfide, and an additive is added to enhance the strength of the lubricant film.

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Regular inspection of plastic IKO plastic bearing maintenance methods

IKO bearings can be removed from the oil seal package immediately before they are delivered for routine inspection, and immersed in washing gasoline or acid-free kerosene containing 3% oil, turning the outer ring and carefully rinsing the junction of the cage, rolling elements and raceways It is required to thoroughly clean the original traces of any hidden parts. After cleaning the plastic bearings, the attached cleaning oil should be drenched, dried on a workbench lined with clean neutral liner, or slowly dried in a far-infrared oven. After the cleaning oil has been drenched and dried or dried, the bearing rings, cages or any rolling elements must not be rotated during the entire process.

Bearings that have been dried or dried shall be dripped into the lubricating oil according to the regulations and immediately delivered for inspection. At this time, the outer surface of the plastic bearing is not protected by oil film. It shall not be in direct contact with the skin of the human hand during the whole inspection process. The operator shall wear clean gloves. Or apply rust inhibitor on the hand, but you must avoid the rust inhibitor on your hand to mix into the rolling surface of IKO bearing, otherwise the measurement results will be biased.

After the inspection, the IKO bearing should be delivered or used for anti-rust inventory processing. The whole inspection process should also be completed to avoid rust caused by too long. Note that cleaning with pure gasoline without oil can cause corrosion.

The bearings must be placed on a metal plate in the inspection site together with the gauge blocks, standard parts and measuring instruments used for inspection before the inspection, so that the temperature of these objects can be homogenized and room temperature faster.

Obviously, only by strictly doing the above preparations can the inspection result be accurate, and the plastic bearings will not rust during the whole inspection process.

1, cleaning:

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

a. The cleaning of the bearing is carried out by rough washing and fine washing. The plastic bearing can be placed on the bottom of the container used.

b. When rough washing, remove the grease or adhesive with a brush or the like in the oil. At this time, if the IKO 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 plastic bearing in the oil, and it must be done 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 the bearing.

2. Inspection and judgment:

In order to judge whether the removed IKO bearing can be reused, the plastic bearing should focus on checking its dimensional accuracy, rotation accuracy, internal clearance, and mating surfaces, raceways, cages and seals.

Regarding the inspection result, it can be judged by a person who is using a conventional bearing or a proficient bearing.

The criteria for judging plastic bearings vary depending on mechanical properties and importance as well as inspection period. IKO bearings must not be reused if they are damaged and must be replaced.

a bearing parts of the fracture and defects.

b Peeling of the rolling surface of the raceway surface.

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