Lubrication plays an important role in the normal operation of mechanical equipment.

(1) Reduce friction coefficient

Adding lubricant between two relatively friction surfaces to form a friction-reducing layer of lubricating oil film can reduce the friction coefficient, increase friction resistance, and reduce power consumption. For example, under good liquid friction conditions, its friction coefficient can be reduced to as low as 0.001. The friction resistance at this time is mainly the low shear resistance of mutual sliding between molecules inside the liquid lubricating film.

(2) Reduce wear and tear

The lubricant between the friction surfaces can support the wear caused by hard particle wear, surface corrosion, welding and tearing between metal surfaces, etc. Therefore, supplying enough lubricant between the friction surfaces can form good lubrication conditions, avoid damage to the oil film, maintain the fitting accuracy of parts, and thus greatly support wear.

(3) Reduce temperature

Lubricants can reduce the friction coefficient and support the generation of friction heat. We know that the work done by a running machine in overcoming friction is converted into heat, part of which diffuses outward from the body, and part of which continuously increases the temperature of the machine. The centralized circulation lubrication system using liquid lubricant can take away the heat generated by friction, achieve accurate cooling, and control the machinery to operate within the required temperature range.

(4) Prevent corrosion and protect metal surfaces

The mechanical surface has no way to avoid contact with the surrounding media (such as air, moisture, water vapor, corrosive gases and liquids, etc.), which will cause the metal surface of the machinery to rust, corrode and be damaged. Corrosion and wear are serious in high-temperature workshops of metallurgical plants and chemical plants.

(5) Cleaning and flushing effect

Wear particles or foreign media generated during the movement of the friction pair will accelerate the friction surface and wear. The fluidity of liquid lubricant can be used to take away the abrasive particles between the friction surfaces, thereby reducing abrasive wear. In pressure circulation systems, flushing function. Used in cold rolling, hot rolling, cutting, grinding, drawing and other processing processesProcess lubricationIn addition to the cooling effect, the agent also has a good flushing effect, preventing the surface from being scratched by solid impurities, so that the surface of the processed finished product (steel) has better quality and surface roughness. For example, adding suspending and dispersing additives to the lubricating oil used in internal combustion engine cylinders can wash the gel and carbon deposits generated in the oil from the cylinder wall and disperse them into small particles suspended in the oil, along with the circulating oil filter. Filter to keep the oil clean, reduce cylinder wear and increase oil change intervals.

(6) Sealing effect

For the cylinders and pistons of steam engines, compressors, internal combustion engines, etc., lubricating oil can lubricate and reduce friction, and also has the effect of increasing sealing, making them airtight during operation, and increasing work efficiency.

Grease plays a role in forming a seal and can prevent water or other dust and impurities from infiltrating into the friction pair. For example, the use of oil-immersed packing coated with grease not only has a good lubrication effect on the seal of the water pump shaft head, but also prevents leakage and dust and impurities from infiltrating into the pump body and plays a good sealing effect.

In addition, lubricants can reduce vibration and noise.