Bearing grease selection and application: to solve the problems of high temperature, burning, volatile, carbonization and oil film rupture
In industrial production, bearing as a key transmission component, its operating status directly affects the overall performance and life of the equipment. However, when the bearing runs under harsh conditions such as high temperature and heavy load, the temperature of the grease is too high, burning, volatile, carbonization, and the oil film on the contact surface is easy to break frequently, which not only aggravate the wear of the bearing, but also may cause equipment failure, and even lead to the production line. Therefore, how to solve these problems through reasonable selection and application of bearing grease has become an urgent problem to be solved in industrial production.
First, the selection of grease for high temperature problems
In view of the problem that bearing grease is volatile and burning under high temperature environment, grease with excellent thermal stability and oxidation resistance should be selected. For example, polyalpha-olefin (PAO), silicone oil or ester based grease, these greases are able to maintain stable lubrication properties at high temperatures, reducing volatilization and burning of grease. At the same time, the drop point of the grease should be at least 20-30 ° C higher than the actual working temperature to ensure that the structure can remain stable at high temperatures and not be lost.
2. Grease optimization for carbonization problems
When the bearing is running at high temperature, the grease is prone to carbonization, forming a hard carbide, which aggravates the bearing wear. To solve this problem, a grease with an extreme pressure additive (Ep Additive) can be selected. These greases can increase the strength of the oil film, reduce metal contact and wear, and inhibit the formation of carbides. In addition, check and replace the grease regularly to avoid excessive carbonization of the grease leading to bearing failure.
Third, grease application of oil film rupture problem
Under high speed and heavy load conditions, the oil film of the bearing contact surface is easy to break, leading to direct metal contact and aggravating wear. In order to solve this problem, advanced lubrication methods such as circulating oil lubrication or spray lubrication can be used. Circulating oil lubrication The filtered oil is transported to the bearing parts through the oil pump, and then recycled after filtering and cooling. This way can continue to provide fresh lubricating oil to the bearing, maintaining the integrity and stability of the oil film. Spray lubrication is to mix dry compressed air with lubricating oil to form an oil mist and spray it into the bearing, which can quickly form a uniform oil film and effectively prevent the oil film from breaking.
Fourth, comprehensive solutions
In practical applications, it is also necessary to develop comprehensive lubrication solutions in combination with the working conditions and requirements of the equipment. For example, under high temperature and heavy load conditions, high temperature and oxidation resistant grease can be selected, combined with advanced lubrication methods such as circulating oil lubrication or spray lubrication, to ensure that the bearing can maintain a stable lubrication state at high temperatures. At the same time, strengthen the maintenance and maintenance of the lubrication system, regularly check the status of the grease and the replacement cycle to ensure the normal operation of the lubrication system.
