Anti-rust performance
The grease used in the bearing must have an anti-rust effect, and the anti-rust agent is preferably insoluble in water. The grease shall have a good adhesion to form an oil film on the steel surface, which can be maintained even if the grease is full of water.
Mechanical stability
Grease will soften during machining, causing leakage. When there is a vibration application example, the grease will be thrown from the bearing housing into the bearing. 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 use of grease is destroyed.
Oil seal
Oil seal is necessary to protect the bearing and lubricant to prevent external pollution, regardless of debris or moisture can not penetrate into the bearing, to prevent damage. Correct installation and maintenance is an important factor in the longest service life of bearings. At the same time, we must pay attention 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 properly installed and lubricated. The design of the bearing arrangement, the condition of the oil seal, the type of lubricant and the lubrication cycle, and even the special maintenance all play the same important role.
Mixed Grease
Never mix incompatible greases, if two incompatible greases are mixed, the consistency will usually become soft and may eventually be damaged by the easy loss of grease. If you do not know that the original use of a bearing grease, you must first remove the bearing inside and outside the old grease, can add grease.
Classification of grease
According to the 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 choose grease with correct consistency and good lubricating effect at the same temperature. Greases are manufactured in different operating temperature ranges and can be divided into low temperature (LT), medium temperature (MT) and high temperature (HT) greases. At the same time, there is a class of grease called EP (resistant to extrusion) or EM (resistant to extrusion and adding molybdenum disulfide), with additives to enhance the strength of the lubricating oil film.
Select grease
If the wrong choice of grease, all measures to prevent bearing damage are in vain. It is very important to choose a grease whose base oil viscosity can provide sufficient lubrication effect at operating temperature. Viscosity is mainly affected by temperature. It rises with temperature. Decline, when the temperature drops, it rises. Therefore, it is necessary to know the viscosity of the base oil at the working temperature. Machinery manufacturers usually specify the use of some kind of grease, and most of the standard grease can be used in a wide range.
Here are a few important factors in choosing a grease:
● Type of machinery
● Working conditions, such as vibration and the direction of the spindle is horizontal or vertical
● Bearing type and size
● Working temperature
● Cooling
● Workload situation
● Sealing effect
● Speed range
● Peripheral environment
If the machine equipment is to play to the best condition, the bearing must be correctly centered and avoid extremely high temperature, humidity and polluted environment.
Proper lubrication and protection plans, as well as bearing condition monitoring work is the focus of the maximum bearing life. When the bearing is damaged, it may cause unexpected equipment downtime. Even a one-hour shutdown can result in significant production losses due to premature bearing failure. To ensure the healthy operation of the equipment, in addition to relying on high-quality bearings, but also pay attention to the operating environment, correct installation and regular maintenance.