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Selection of lubricants

  The main indicator of lubricants is viscosity, commonly used quality characteristics and evaluation indicators are as follows:

Quality characteristics

Evaluation index

fluidity

Viscosity, Viscosity Index, Pour Point (Freezing Point)

Corrosion resistance

Rust-proof, copper corrosion

Life expectancy

Antioxidant stability

Anti-wear

Abrasion resistance (gear test, pumping test), extreme pressure (four-ball test, Tymken test), oily (friction coefficient), (Bowden test).

Degree of refinement, additive thermal stability

Chroma, neutralization (acid value, base value), residual carbon, ash content, trace element content, thermal stability, flash point

  (1) Work load.The working load of the sports crew is directly related to the fluidity and abrasion resistance of the lubricating oil used. Sportsmen suffered heavy load, the use of larger viscosity lubricant, oil and extreme pressure should be good. The load is small, the viscosity of the lubricant used is smaller, and the requirements for oiliness and extreme pressure are lower.

  (2) speed of movement.Usually high speed vice, you need to use a lower viscosity lubricant to reduce frictional resistance, reduce the power consumption and heat. Low speed, available high viscosity oil.

  (3) Operating temperature.Operating temperature, the impact of changes in the viscosity of the oil used and oxidation rate. The working temperature increases, the viscosity of the lubricating oil becomes lower, and vice versa, and the oxidation rate of the lubricating oil accelerates and deteriorates under high temperature, shortening the service life. Therefore, at high temperature lubrication points should use viscosity, high viscosity index, high flash point and oxidation stability of lubricating oil. The general flash point of lubricating oil should be higher than the maximum temperature of 20 ~ 30 ℃. Mineral oil maximum operating temperature of 120 ~ 150 ℃, ester synthetic oil maximum operating temperature of 200 ~ 250 ℃, silicone oil is 200 ~ 250 ℃. Long-term work at low temperatures Especially in winter in the alpine open-air operations equipment and vehicles, due to low viscosity at high temperatures pumping difficult and difficult to start, it should be used at low temperature lubrication of good lubricating grease, grease, usually Lubricating oil used in the freezing point (or pour point) should be lower than the ambient temperature 8 ~ 10 ℃. Some types of lubricants also winter oil, summer oil and summer and winter universal oil varieties, different temperatures for different seasons lubrication points to use.

  (4) Environmental conditions In addition to the above operating temperature, should also consider the wet environment and media environment where the sports associate lives. Lubricating points for equipment operating under wet conditions such as "rainy season", salt spray, water vapor, coolant or emulsion are generally lubricants, greasy perishable, emulsified or lost by water rinsing Should be used in the anti-emulsification, anti-rust and anti-corrosion and good adhesion of lubricants, and should take appropriate sealing measures to prevent the invasion of moisture and moisture, salt spray and so on. Medium environment such as chemical environment, corrosive media (strong acids, alkalis, salts, etc.) are prone to lead to increased corrosiveness of lubricants and greases. Lubricants with good chemical stability should be used.

  In addition, lubricants operating under ultra-vacuum (1.33 * 10E-6Pa) conditions should have a low degree of evaporation. For the oil working under the conditions of radiation, should have strong anti-radiation. The system used in high temperature and flammable conditions should be used in the system of flame retardant medium.

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