The selection of bearing grease must be considered from the following aspects

Date of release:2018-12-31 Author: Click:


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




1, rust resistance


The grease used in the bearing must have anti-rust effect, and the anti-rust agent is insoluble in water. The grease shall have good adhesion and form an oil film on the steel surface.




2. Mechanical stability


Grease softens during machining, leading to leakage. During normal operation, grease will be thrown from the housing into the bearing. If the mechanical stability of the grease is not enough, during the operation, the structure of the soap of the grease will be mechanically disintegrated, causing the grease to be damaged, thus losing the lubrication effect.




3, oil seal,


The oil seal is an essential barrier to protect the bearing and lubricant from external pollution. During the operation of the bearing, no matter debris or moisture can penetrate into the bearing to prevent damage to it.


Proper installation and maintenance is an important factor for bearing life. At the same time, attention must be paid to the cleanliness of the bearing, the accuracy of bearing selection and the selection of appropriate installation and maintenance tools. In addition, bearings must be protected from contamination by contaminants 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 the special maintenance all play the same and important roles.




4. Mix oil and grease


Never mix incompatible fats and oils. If two incompatible fats and oils are used together, the consistency will usually soften, and the grease may easily run away and cause bearing damage. If you do not know the type of grease used in the bearing, you must thoroughly remove the old grease inside and outside the bearing before adding new grease.




5. Classification of oils and fats


Mainly according to the temperature and operating conditions: grease can be classified according to their allowable operating temperature, the consistency and lubrication ability of grease is affected by the operating temperature, bearing operation at a certain temperature must choose the correct consistency and good lubrication effect at the same temperature grease. Fats and oils are manufactured in different operating temperature ranges, which can be roughly divided into low temperature, medium temperature and high temperature fats and oils. At the same time, there is a class of oils called extrusion resistant or extrusion resistant and molybdenum disulfide is added, and an additive is added to strengthen the lubricating oil film.




6. Important factors in selecting fats and oils


It is important to choose a grease whose base oil viscosity provides adequate lubrication at the operating temperature. The viscosity is mainly affected by the temperature. It decreases as the temperature increases, and it increases when the temperature decreases. Therefore, it is important to know the base oil viscosity at operating temperature. Machinery manufacturers usually specify a particular type of grease, but most standard greases are used in a wide range of applications.




The above are important factors in choosing grease: type of machine; Bearing type and size; Operating temperature; Workload; Speed range; Working conditions, such as vibration and spindle direction is horizontal or vertical; Cooling condition; Sealing effect; Peripheral environment.


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