Grease is used a lot in the lubrication and maintenance of machinery and equipment, and it 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. Therefore, when using grease It is necessary to observe the use state frequently, understand the reasons for the failure of the grease, and timely prevent and prevent the loss caused by the failure of the grease. This article mainly analyzes what are the reasons for the failure of the grease?

1. Failure caused by physical factors

In use, the grease will be subjected to mechanical shearing and centrifugal force at the same time. Under the action of mechanical shearing and centrifugal force, the grease will be thrown out of the friction interface to separate oil, resulting in the reduction of grease oil content and the reduction of cone penetration and hardening. It will fail completely; under the action of mechanical shearing, the grease structure will be destroyed (such as soap fibers), causing its softening, decrease in consistency and increase in oil separation, etc., which will eventually lead to failure. Under normal circumstances, if the transmission speed of grease is increased by 2000r/min, its 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

The grease reacts chemically with oxygen in the air to produce acidic substances. It first consumes the antioxidant additives in the grease, but after a certain level, the generated organic acid will corrode the metal components and destroy the structure of the grease, making it drop point. decrease, base oil viscosity increases, and fluidity deteriorates. A large number of tests have shown that the higher the temperature, the more obvious the decline in the life of the grease. For example, when the temperature is between 90 and 100 degrees, for every 19 degrees increase in temperature, the life of the grease will be reduced by about half, and at 10 to 150 degrees, every 15 degrees of temperature increase, the life of the grease will also be 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, the abrasive particles such as copper, iron, lead and bronze are mixed into the grease, which will catalyze the oxidation of the grease. In short, there are many reasons for the failure of lubricating grease, which may sometimes be caused by a certain reason, but it is more the result of the simultaneous action of multiple factors, or one reason is the breakthrough, and then other reasons work together.