Lubricating grease is widely used in the lubrication and maintenance of mechanical equipment and plays a very important role in the maintenance of equipment. Once the grease fails, if it cannot be found in time, it will cause great damage to the equipment, so when using grease It is necessary to constantly observe the use status, understand the causes of grease failure, and timely prevent and prevent the loss caused by grease failure. This article mainly analyzes the reasons for grease failure?

1. Failure caused by physical factors

The grease will be subjected to mechanical shear and centrifugal force at the same time during use. The grease will be thrown out of the friction interface to separate the oil, resulting in reduced oil content, reduced cone penetration and hardening. After a certain degree of grease It will completely fail; under mechanical shearing, the structure of the grease loves to break down (such as soap fibers), causing it to soften, decrease in consistency, and increase the amount of oil, etc., which eventually leads to failure. Normally, if the transmission speed of grease is increased by 2000r/min, its service life will be reduced by about half. Under high shear stress, the speed is doubled, and the service life is only 1/10 of the original life.

2. Failure caused by chemical factors

Lubricating grease chemically reacts with oxygen in the air to produce acidic substances. It first consumes antioxidant additives in the fat, but to a certain extent, the generated organic acids will corrode the metal components and destroy the structure of the fat, making it drop point Decreased, increased base oil viscosity and poor fluidity. A large number of tests have shown that the higher the temperature, the more obvious the decrease in grease life. For example, when the temperature is between 90 and 100 degrees, the life of the fat is reduced by about half every time the temperature is increased by 19 degrees, and when the temperature is increased by 15 degrees when the temperature is between 10 and 150 degrees, the life of the fat is also reduced by half. In addition, moisture, dust, and harmful gases in the environment in which the grease is used are also important factors for its deterioration. For example, grease, copper, iron, lead and bronze are mixed with wear particles, which will catalyze the oxidation of ground grease. In short, there are many reasons for the failure of grease, and sometimes it may be caused by a certain reason, but more is the result of multiple factors acting together, or taking one cause as a breakthrough, and then other factors acting together.