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What is the relationship between the material and function of the bearing?
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Rolling bearing ferrule and roll body; one side repeatedly subjected to high touch pressure; one side is accompanied by a sliding touch touch. The retainer; one side with the ferrule and the roll body; or one side of the sliding touch; one side is subjected to tension and shortening Therefore, the ferrule of the bearing; the material, function and important requirements of the roll and cage are as follows.
The functions demanded by the ferrule and the rolling material: tumbling fatigue strength, high hardness, high abrasion resistance, and high-resistance. The function of the cage material is good: the dimensional stability is good, the mechanical strength is large, and the processing property is good. It is not the same according to the use; It is pleaded for its impact resistance, heat resistance and corrosion resistance.
Ferrule and roll material: ferrule and roll body are generally made of high carbon chromium bearing steel. Most of the bearings; use JJ steel type SUJ2. Large bearings use SUJ3.
The chemical composition of SUJ2; in the world; as a bearing material has been standardized. For example: with AISL52100 (United States), DIN100Cr6 (West Germany), BS535A99 (UK) are the same kind of steel.
Further need to withstand impact; use chrome steel, chrome molybdenum steel, nickel chrome molybdenum steel as bearing material, adopt carburizing and quenching; make steel have a softening layer from the surface to the proper depth. With proper softening depth and fineness Arrangement, suitable for hardness surface and core hardness of the carburized bearing; better bearing impact than bearing steel bearing; a chemical component of another carburized bearing steel.
NSK has implemented vacuum degassing; therefore; the materials used have high purity, low oxygen content and good quality. The appropriate heat treatment is adopted; the rolling fatigue life of the bearing is significantly advanced.
In addition to the above steel grades; according to the unique use; also use high-speed steel with excellent heat resistance; stainless steel with good corrosion resistance.
Cage material: material for stamping cage; low carbon steel. Different depending on the application; also used brass plate, stainless steel plate. Material for cutting cage; using high-strength brass, carbon steel; Apply differentiation resin.
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