The role of bearing is to play a supporting role, if the transmission parts (such as: shaft) directly with the hole, a transmission resistance, secondly, after the wear is large, the transmission parts are not easy to replace, and the bearing is dependent on the rolling contact between components to support the transmission parts.
So sliding resistance is small, less power consumption, easy to start and so on. The main function of bearing is to support the mechanical rotating body, reduce its friction coefficient in the process of motion, and ensure its rotation accuracy.
It can be understood that it is used to fix the axis, so that it can only achieve rotation, and control its axial and radial movement. If the shaft has no bearings it will not work at all.
Because the axis can move in any direction, it is required to rotate only. Bearings are widely used in automobiles: rear wheels, transmission, electrical components.
Electrical: general motors, household appliances. Instrumentation, internal combustion engine, construction machinery, railway rolling stock, loading and unloading machinery, various industrial machinery. Machine tool spindles, agricultural machinery, high frequency motors, steam turbines, centrifuges, small car front wheels, differential pinion shafts.
Oil pump, Roots blower, air compressor, all kinds of transmission, fuel injection pump, printing machinery, motor, generator, internal combustion engine, steam turbine, machine tool spindle, reducer, loading, unloading and handling machinery, all kinds of industrial machinery, etc. Almost as long as it is rotating rotating are used to bearings.
Bearing tasks, not only rolling friction, but also sliding friction between the ring, the rolling body and the maintenance frame, so that the bearing parts have been wearing.
In order to increase the wear of bearing parts, maintain the stability of bearing accuracy and extend the service life, bearing steel should have good wear resistance. Hardness hardness is one of the important qualities of bearing quality, which has an indirect impact on contact fatigue strength, wear resistance and elastic limit.
The hardness of bearing steel in use is up to HRC61~65, which enables the bearing to obtain higher contact fatigue strength and wear resistance. In order to avoid corrosion and rust of bearing parts and finished products in the process of processing, storage and use, the bearing steel should have good rust resistance.
Bearing parts in the course of consumption, to go through many cold and hot processing procedures, in order to meet the requirements of a small amount, high efficiency and high quality, bearing steel should have good processing performance.
For example, cold and hot forming performance, cutting performance, hardenability and so on. In addition to the above basic requirements, bearing steel should also reach the requirements of appropriate chemical composition, average external organization, less non-metallic dopants, external appearance defects fit the specification, and the appearance decarbonization layer does not exceed the rule concentration.
Post time: Apr-20-2022