Let's first understand the basic structure of needle roller bearings. It mainly includes several parts such as ferrule, rolling body, cage, etc. Because the function of each part and the effect force it bears are different, so when selecting materials To be especially cautious, the performance requirements of the various components of the needle roller bearing must be satisfied.
Rings and rolling bodies of needle roller bearings When the needle roller bearing is in operation, one side of the ring and rolling body repeatedly bears high touch pressure, while the other side performs rolling touch with sliding. From this point of view, needle roller bearing rings and rolling bodies require materials with good dimensional stability, high fatigue strength, high hardness, and good wear resistance, and are usually made of high-carbon chromium bearing steel. At the same time, it is also necessary to consider the performance of materials in terms of impact resistance, heat resistance, and corrosion resistance according to different uses.
If the actual requirements require better impact resistance, chromium steel, chromium molybdenum steel, nickel chromium molybdenum steel, etc. can be selected as bearing materials, and after carburizing and quenching treatment, the steel has a hardened layer from the surface to the appropriate depth. Then further improve its impact resistance. Some needle roller bearings are also treated with vacuum degassing when they are manufactured, so that the rolling fatigue life of the bearing is significantly improved, which helps to extend the life of the entire needle roller bearing.
For needle roller bearings, one side of the cage touches both sides of the ferrule and the rolling body, or one side thereof; there is also the effect of bearing tension and compression on the other side. However, the selection of materials must also be combined with actual uses. If it is used for stamping, use low-carbon steel as its material, and if it is used for cutting cages, high-strength brass, carbon steel and synthetic resin Both are good choices.