When the bearing is working, especially at high speeds, the cage is subjected to large centrifugal forces, impact and vibration, large sliding friction, and generates a large amount of heat. Therefore, the material is required to have good thermal conductivity, good wear resistance, small friction coefficient, small specific gravity, a certain strength, a coefficient of expansion close to the rolling element, and good processing performance. Special purpose bearing cages also have special requirements, such as high temperature resistance. Currently commonly used cage materials are high quality low carbon steel (08, 10, 08F, 10F), brass, stainless steel, spring steel, alloy steel, phenolic tape, plastic and so on.
The heat treatment of the cage is mainly used for stamping cages, mostly for heat treatment between processes, so that the material can be restored to plasticity, which will cause severe work hardening and internal stress during the processing of the cage. Such heat treatments include: recrystallization annealing of high-quality carbon sheet steel cold stamping cage (heating to about 600 ° C, heat preservation for 2 to 3 h, furnace cooling); recrystallization annealing of brass strip cold stamping cage (heating to 600-650 ° C, Insulation for 30 min, air or water cooling); stainless steel with cold stamping softening treatment.
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