The technical parameters of REXROTH bearing materials are divided into several sections
REXROTH bearings are fixed shafts that allow them to only rotate, while controlling their axial and radial movements. If the motor does not have bearings, it cannot work at all. Because the shaft can move in any direction, and the motor requires the shaft to only rotate during operation. In theory, it is impossible to achieve the function of transmission. Moreover, bearings can also affect transmission. In order to reduce this effect, good lubrication must be achieved on the bearings of high-speed shafts. Some bearings already have lubrication, called pre lubricated bearings, while most bearings must have lubricating oil, which is responsible for not only increasing energy consumption due to friction during high-speed operation, but also easily damaging the bearings. The notion of converting sliding friction into rolling friction is one-sided, as there is something called sliding bearings.
REXROTH bearing lubrication
The lubrication purpose of REXROTH bearings is to reduce internal friction and wear, and prevent burning and sticking; Extend its service life; Eliminate frictional heat and cooling, prevent bearing overheating, and prevent lubricating oil from aging on its own; It also has the effect of preventing foreign objects from entering the interior of the bearing, or preventing rust and corrosion.
REXROTH bearing lubrication method
The lubrication methods for REXROTH bearings are divided into grease lubrication and oil lubrication. In order to make the bearing function well, first, it is necessary to choose a lubrication method that is suitable for the usage conditions and purposes. If only lubrication is considered, the lubricity of oil lubrication dominates. However, grease lubrication has the advantage of simplifying the structure around the bearing. Compare the advantages and disadvantages of grease lubrication and oil lubrication. Special attention should be paid to the amount of lubrication, whether it is oil lubrication or grease lubrication. Insufficient lubrication with too little amount will affect the bearing life, while too much amount will generate large resistance and affect the speed.
REXROTH bearing seal
The sealing of REXROTH bearings can be divided into two types: self sealing and external sealing. The so-called bearing with built-in sealing refers to manufacturing the bearing itself into a device with sealing performance. Such as bearings with dust covers, sealing rings, etc. This type of seal takes up very little space, is easy to install and disassemble, and has a relatively low cost. The so-called bearing external sealing performance device refers to a sealing device with various properties manufactured inside the installation end cover and other components. The external sealing of bearings is divided into two types: non-contact sealing and contact sealing. Non contact sealing is suitable for high-speed and high-temperature applications, with different structural forms such as gap type, labyrinth type, and gasket type. Contact seals are suitable for medium and low-speed working conditions, and commonly used structural forms include felt seals, cup seals, etc.
1、 The contact fatigue strength of REXROTH bearings is affected by cyclic loads, and the contact surface is prone to fatigue damage, such as cracking and peeling, which is an important failure of bearings. Therefore, in order to improve the service life of bearings, bearing steel must have high contact fatigue strength.
2、 Wear resistance performance
During the REXROTH bearing task, not only rolling friction but also sliding friction occurs between the ring, rolling elements, and support frame, resulting in continuous wear of the bearing components. In order to increase the wear of bearing components, maintain the stability of bearing accuracy, and extend the service life, bearing steel should have good wear resistance.
3、 Hardness
The hardness of REXROTH bearings is one of the important qualities of bearing quality, which indirectly affects the contact fatigue strength, wear resistance, and elastic limit. The hardness of bearing steel under certain operating conditions should reach HRC61~65, which enables the bearing to achieve high contact fatigue strength and wear resistance.
4、 Rust prevention performance
In order to prevent corrosion and rust of bearing parts and finished products during processing, storage, and use, REXROTH bearings require bearing steel to have good rust prevention performance.
5、 Processing performance
During the consumption process of REXROTH bearing parts, they undergo many cold and hot processing steps. In order to meet the requirements of small quantity, force, and high quality, bearing steel should have good processing performance. For example, cold and hot forming performance, cutting performance, hardenability, etc.
In addition to the basic requirements mentioned above, REXROTH bearing steel should also meet the requirements of appropriate chemical composition, average external structure, minimal non-metallic impurities, compliance with specifications for external surface defects, and irregular concentration of decarburization layer on the surface.