Anti-rust performance
The grease used in the bearing must have an anti-rust effect, and the anti-rust agent should preferably be insoluble in water. The grease should have good adhesion to form an oil film on the surface of the steel, and it can be maintained even if the grease is filled with water.
Mechanical stability
Grease will soften during machining, causing leakage. When there is an application example of vibration, grease will be thrown into the bearing from the bearing seat. If the mechanical stability of the grease is not enough, the grease will continue to be thrown out of the bearing, which will cause the structure of the soap to mechanically disintegrate and the grease used will be destroyed.
Oil seal
The oil seal is necessary to protect the bearing and lubricant to prevent external contamination, no matter whether debris or moisture can penetrate into the bearing to prevent damage. Correct installation and maintenance is an important factor for the longest service life of the bearing. At the same time, attention must be paid to the cleanliness of the bearing, the correctness of the bearing selection and the selection of appropriate installation and maintenance tools. Bearings must be protected from contaminants and moisture, and must be installed and lubricated correctly. The design of the bearing arrangement, the condition of the oil seal, the type of lubricant and the lubrication cycle, and even specialized maintenance all play the same important role.
Mixed grease
Never mix incompatible oils and fats. If two incompatible oils and fats are mixed, the consistency will usually become soft, and it may be damaged due to the easy loss of oils. If you don't know what kind of grease the bearing originally used, you must first remove the old grease inside and outside the bearing before refilling the grease.
Classification of grease
According to temperature and working conditions: Grease can be classified according to their allowable working temperature. The consistency and lubricating ability of grease are affected by the working temperature. Bearings operating at a certain temperature must be selected to have the correct consistency and good quality at the same temperature. Grease with lubricating effect. Grease is manufactured in different operating temperature ranges, which can be divided into low temperature (LT), medium temperature (MT) and high temperature (HT) greases. At the same time, there is a type of grease called EP (extrusion resistant) or EM (extrusion resistant with addition of molybdenum disulfide), and additives are added to enhance the strength of the lubricating oil film.
Choose grease
If you choose the wrong grease, all measures to prevent bearing damage are in vain. It is important to choose a grease whose base oil viscosity can provide sufficient lubrication effect at working temperature. The viscosity is mainly affected by temperature, and it rises with temperature. And when it drops, it rises when the temperature drops. Therefore, it is necessary to know the viscosity of the base oil at operating temperature. Machine builders usually specify the use of a certain grease. Most standard greases can be used in a wide range.
The following are several important factors for choosing grease:
●Machinery type
●Working conditions, such as vibration and the direction of the main shaft is horizontal or vertical
●Bearing type and size
●Working temperature
●Cooling condition
●Work load situation
●Sealing effect
●Speed ​​range
● Peripheral environment
If the machinery and equipment are to perform to the best condition, the bearings must be properly aligned and avoid extremely high temperature, humidity and polluted environments.
Appropriate lubrication and protection plan, as well as bearing condition monitoring work is the focus of maximizing bearing life. When the bearing is damaged, it may cause unexpected equipment downtime. Even if it is a one-hour shutdown, the premature failure of the bearing may cause huge production losses. To ensure the healthy operation of the equipment, besides relying on high-quality bearings, it is also necessary to pay attention to the operating environment, correct installation and regular maintenance.