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What are the tips for choosing bearing grease?

release time:2018-05-26
The choice of bearing grease is directly related to the stable operation of the equipment. In order to better play the best condition of the bearing, the choice of bearing grease must be considered from the following aspects:
A: anti-rust performance
The grease used in the bearing must have a rust preventive effect, and the rust inhibitor should preferably be insoluble in water. Grease should have good adhesion and can form a film of oil on the surface of the steel.
Two: mechanical stability
Greases soften during machining and cause leakage. During normal operation, grease will be thrown from the bearing housing into the bearing. If the mechanical stability of the oil is not sufficient, during the operation, the soap structure of the oil will mechanically disintegrate, causing the oil to be destroyed and thus lose its lubricating effect.
Three: oil seal
The oil seal is necessary to protect the bearing and the lubricant from the foreign pollution barrier. During the operation of the bearing, no impurity or moisture can penetrate into the bearing to prevent its destruction.
Proper installation and maintenance are important factors for the longest service life of the bearing. At the same time, attention must be paid to the cleanliness of bearings, the correctness of bearing selection and the selection of appropriate installation and maintenance tools. In addition, the bearings must be protected from contamination and moisture, and they must be properly installed and lubricated. Therefore, the design of the bearing arrangement, the condition of the oil seal, the type of lubricant, the lubrication cycle, and even the special maintenance all play the same and important roles.
Four: mixed oil
Never mix incompatible oils. If two incompatible oils are used, the consistency of the two oils will usually become soft. Finally, the bearing may be damaged due to the loss of grease. If you do not know which type of grease was originally used in the bearing, you must first remove the old grease inside and outside the bearing before adding new grease.
Five: Classification of fats and oils
Mainly based on temperature and working conditions are distinguished: grease can be classified according to their permissible operating temperature, grease consistency and lubrication capacity is affected by the working temperature, bearings operating at a certain temperature must choose the correct consistency at the same temperature And grease with good lubrication effect. Greases are manufactured in different operating temperature ranges and can be roughly classified into greases for low, medium and high temperatures. At the same time, there is a type of oil called extrusion-resistant or crush-resistant and added with molybdenum disulfide, and at the same time, additives are added to enhance the strength of the lubricant film.
Six: The important factor in choosing oil
If the wrong choice of grease is all measures to prevent bearing is also futile, choose a grease, its base oil viscosity at the operating temperature is sufficient to provide sufficient lubrication effect is important, the viscosity is mainly affected by temperature, it with the temperature It goes up and falls, and when it goes down, it goes up. Therefore, it is necessary to know the base oil viscosity at the operating temperature. Machinery manufacturers usually specify the use of a certain grease, however most standard greases are suitable for a wide range of applications.
Seven: Several Important Factors in Selecting Grease
Type of machinery; type and size of bearing; operating temperature; work load condition; speed range; work conditions such as vibration and spindle direction is horizontal or vertical; cooling conditions; sealing effect; peripheral environment.