4, mixed grease
Never mix incompatible greases. If two incompatible greases are mixed, the consistency will usually be soft. In the end, the sliding bearings may be damaged due to the easy loss of grease. If you don't know which grease is used in the INA bearing, you must completely remove the old grease inside and outside the bearing before adding new grease.
There are usually the following basic requirements for lubricants:
(1) It has sufficient lubricating effect, which can reduce the friction of the bearing and inhibit the harmful wear process in the bearing. The frictional resistance is small and the anti-wear ability is large.
(2) Preventing corrosion of the bearing, which itself does not cause corrosion, deterioration or deformation of components of the sliding bearing (such as copper cages, rubber seals, etc.).
(3) It is possible to maintain the necessary lubricating performance within the range of the upper and lower limits of the specified operating temperature, and the chemical composition is stable and the viscosity does not change much.
(4) A sufficiently thick oil film can be established within the range of the upper and lower limits of the specified working speed; it is clean, free of impurities, and has good defoaming properties.
(5) Physical properties and chemical properties are stable enough during the required working period or during the inventory period, so as not to affect the quality of the use.
(6) Maintenance and maintenance are simple and the attachments are as small as possible.
(7) Under the premise of meeting the above technical requirements, economically strive to save.
2. Additional requirements for lubricants
(1) has a good cooling effect.
(2) It has strong adhesion to the surface to be lubricated, and leakage, dripping or scattering is as small as possible; water separation is good.
(3) Mixing a small amount of impurities (such as moisture) does not affect its performance.
(4) It acts as a seal to prevent water or dirt from entering the bearing.
(5) It is not easy to transmit vibration or reduce noise.
(6) Centralized lubrication can be implemented.
3. Special requirements for lubricants
Under special conditions, the following special requirements must be imposed on the lubricant:
(1) Long life requirements Lubricants are required to have a particularly long service life.
(2) Low friction torque requirements The frictional resistance of the lubricant is required to be low.
(3) Requirements for high temperature resistance It is required to withstand high temperatures above 250 °C.
(4) Low temperature resistance requirements It is required to withstand low temperatures below -63 °C.
(5) High vacuum resistance requirements Under high vacuum conditions, it is not volatile, does not dissipate, and does not deteriorate, especially under high vacuum conditions under weightless conditions.
(6) Harmless requirements
Mainly 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 working temperature. Sliding bearings operating at a certain temperature must be selected at the same temperature. Grease with consistency and good lubrication. Grease is manufactured in different operating temperature ranges and can be roughly classified into low temperature, medium temperature and high temperature greases. At the same time, there is a type of grease called extrusion resistance or extrusion resistance and the addition of molybdenum disulfide, and at the same time, an additive is added thereto to strengthen the strength of the lubricant film.
If the grease is wrongly selected, all measures to prevent the bearing are futile. It is important to choose a grease whose base oil viscosity provides sufficient lubrication at the working temperature. The viscosity is mainly affected by temperature, and it varies with temperature. It rises and falls, and when the temperature drops, it rises. Therefore, it is necessary to know the viscosity of the base oil at the operating temperature. Mechanical manufacturers usually specify the use of certain greases, but most standard greases are available in a wide range of applications.
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