The choice of bearing material has certain influence on the bearing performance.
The ring and the rolling body of the rolling bearing repeatedly bear the high contact pressure on one hand, and on the other hand make rolling contact accompanied by sliding.Retainer, one side is in contact with both sides of the ring and rolling body, or one side of its slide, one side bears the tension and compression force.Therefore, the bearing ring, rolling body and cage material, performance, the main requirements are as follows.
Performance required by ring and rolling material:
High rolling fatigue strength, high hardness and high friction resistance
Performance required for cage material:
Good dimensional stability and large mechanical strength
In addition, also need good processing.According to the use of different, there are requirements for its impact resistance, heat resistance, corrosion resistance good.
Materials of the ring and rolling body:
High carbon chromium bearing steel is usually used for the ring and rolling body.Most bearings use SUJ2 of JIS steel.Large bearings use SUJ3.
The chemical composition of SUJ2, in all countries of the world, has been normalized as a bearing material.For example: with AISL52100 (USA), DIN100Cr6 (west Germany), BS535A99 (UK) are the same type of steel.
Further need to withstand the impact of the case, as a bearing material to use chromium steel, chromium molybdenum steel, nickel chromium molybdenum steel, carbon hardening, so that the steel from the surface to the appropriate depth of a hardening layer.The carbonized bearing with proper hardening depth, fine structure, suitable hardness of the surface and core hardness has better impact resistance than the bearing steel, and the general chemical composition of the steel used for the carbonized bearing.
NSK implemented the vacuum degassing treatment, so, the use of materials with high purity, less oxygen content, good quality.Furthermore, proper heat treatment is adopted to significantly increase the rolling fatigue life of the bearing.
In addition to the above steel types, according to the special purpose, but also use good heat resistance high speed steel, corrosion resistance good stainless steel.
Cage material:
Stamping cage material, using low carbon steel.According to use different, also use brass plate, stainless steel plate.Cut the material of the cage, use high strength brass, carbon steel, also use synthetic resin.