The ball bearing ring and the rolling body are repeatedly subjected to high contact pressure, and the rolling contact is made along with the sliding. The holder is in sliding contact with both sides of the ferrule and the tumbling body, or one of them, and bears tensile and compressive forces. Therefore, the material, performance and main requirements for bearing rings, rolling bodies and cages are as follows.
的 Performance required for ferrule and tumbler materials:
High rolling fatigue strength High hardness High abrasion resistance
Good dimensional stability, large mechanical strength, and good workability. Depending on the application, it is also required to have good impact resistance, heat resistance and corrosion resistance.
Material of ferrule and rolling body:
Ferrules and rolling elements are usually made of high carbon chromium bearing steel. Most bearings use SUJ2 from JIS steel. Large bearings use SUJ3.
The chemical composition of 的 SUJ2 has been standardized as a bearing material in various countries around the world. For example: AISL52100 (USA), DIN100Cr6 (West Germany), BS535A99 (UK) are all the same steel.
In the case of further impact resistance, chromium steel, chromium molybdenum steel, nickel chromium molybdenum steel is used as the bearing material, and carburizing and quenching are used to make the steel have a hardened layer from the surface to an appropriate depth. Carburizing bearings with appropriate hardening depth, fine structure, suitable hardness surface and core hardness, have superior impact resistance than bearings using bearing steel, and the chemical composition of general carburizing bearing steel.
