Analysis of the data function of the ferrule and the roll

Data Analysis of the Ferrule and Roll in Bearings

Source: China Bearing Network | Date: September 16, 2013
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Daily Reading: In rolling bearings, the ferrule and roll body are subjected to repeated high contact pressure on one side, while the other side experiences rolling contact with the raceway. The cage, on one side, interacts with the ferrule and roll body, or slides against one side while absorbing tensile and compressive forces. Therefore, the data, functions, and main requirements for the ferrules, rolls, and cages are as follows:

Key Functions Required for Ferrules and Rolls: - Rolling fatigue strength - High hardness - Excellent wear resistance - Long service life - For the cage: - Good dimensional stability - High mechanical strength - Good machinability - Depending on application, additional requirements may include impact resistance, heat resistance, and corrosion resistance Material Information for Ferrules and Rolls: Ferrules and rolls are typically made from high-carbon chromium bearing steel. Most bearings use SUJ2 (Japanese standard), which is widely recognized internationally. Its chemical composition is standardized globally, similar to AISI 52100 in the U.S., DIN 100Cr6 in Germany, and BS 535A99 in the UK. For applications requiring higher impact resistance, chrome steel, chrome-molybdenum steel, or nickel-chrome-molybdenum steel may be used. These materials are often carburized to create a hardened layer on the surface, improving impact resistance compared to standard bearing steels. The appropriate depth of hardening, fine microstructure, and suitable surface hardness ensure optimal performance. NSK employs vacuum degassing treatment, resulting in cleaner materials with lower oxygen content and superior quality. Proper heat treatment significantly enhances the lifespan of rolling elements in bearings. In addition to these standard grades, special applications may use high-speed steel for heat resistance or stainless steel for corrosion resistance. Material Information for Cages: Cage materials are usually low-carbon steel for stamping. Depending on the application, brass plates or stainless steel may also be used. For cutting processes, high-strength brass, carbon steel, or synthetic resins can be applied.
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