Skills of selecting bearing grease


The selection of bearing grease is directly related to the stable operation of equipment. In order to give full play to the best condition of bearings, the selection of bearing grease must be considered from the following aspects:

1. antirust performance

The grease used in bearings must have antirust effect, and the antirust agent should be insoluble in water. Grease should have good adhesion and can form an oil film on the surface of steel.


2. Mechanical stability

Grease will soften during machining, leading to leakage. During normal operation, grease will be thrown into the bearing from the bearing seat. If the mechanical stability of grease is not enough, the structure of grease soap will disintegrate mechanically during operation, resulting in the destruction of grease and loss of lubrication.


3. Oil seal

Oil seal is a necessary barrier to protect bearings and lubricants from external pollution. During the operation of bearings, no matter sundries or moisture can penetrate into the bearings, {TodayHot} to prevent damage to them.


Correct installation and maintenance is an important factor to maximize the service life of bearings. At the same time, we must pay attention to the cleanliness of bearings, the correctness of bearing selection and the selection of appropriate installation and maintenance tools. In addition, the bearing must be protected from contamination by pollutants and moisture, and be properly installed and lubricated. Therefore, the design of bearing arrangement, the condition of oil seal, the type and lubrication cycle of lubricant, and even special maintenance all play the same and important role.


4. Mixed grease

Never mix incompatible oils and fats. If two incompatible oils and fats are mixed, their consistency will usually soften, and finally the bearing may be damaged due to the easy loss of oils and fats. If you don't know what kind of grease was originally used in the bearing, you must thoroughly remove the old grease inside and outside the bearing before adding new grease.


5. the classification of oil

Mainly according to temperature and working conditions: grease can be classified according to their allowable working temperature, and the consistency and lubricating ability of grease are affected by working temperature. Bearings operating at a certain temperature must choose grease with correct consistency and good lubricating effect at the same temperature. Oils and fats are manufactured in different working temperature ranges, which can be roughly divided into low temperature oils, medium temperature oils and high temperature oils. {HotTag} At the same time, there is a kind of grease called extrusion resistance or extrusion resistance, and molybdenum disulfide is added. At the same time, additives are added to it to strengthen the strength of lubricating oil film.


6. an important factor in choosing oil.

If you choose the wrong grease, all measures to prevent bearings will be futile. It is very important to choose a grease whose base oil viscosity can provide sufficient lubrication effect at working temperature. The viscosity is mainly affected by temperature, which decreases with the increase of temperature, and increases when the temperature decreases. Therefore, it is necessary to know the viscosity of base oil at working temperature. Machinery manufacturers usually specify the use of a certain grease, but most of the standard greases have a wide range of applications.


The following are several important factors in choosing lubricating grease: mechanical type; Bearing type and size; Working temperature; Workload situation; Speed range; Working conditions, such as vibration and whether the direction of the spindle is horizontal or vertical; Cooling situation; Sealing effect; External environment.

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