Among the four major components of precision ball bearings, except for the cage, the inner and outer rings and rolling elements (steel balls, roller bearings or needle rollers) are all made of bearing steel, and bearing steel has the 'king of steel' This title is a steel grade with stricter requirements in steel production. There are also many types of bearing steel, depending on the conditions of use, the composition is also different, among which high-carbon steel chromium bearing steel accounts for a large proportion, is the steel grade widely used in the production of rolling bearings and bearing parts. The quality of bearing steel depends entirely on the following four elements: one is the content, shape, distribution and size of inclusions in the steel; the second is the content, shape, distribution and size of carbides in the steel; the third is the center of the steel Porosity, shrinkage and center segregation; Fourth, the consistency of product characteristics of bearing steel. These four elements can be summarized as purity and uniformity indicators. Among them, the purity stipulates that the inclusions in the material should be avoided as much as possible, and the quality of the purity is directly related to the fatigue life of precision ball bearings; while the uniformity requires that the inclusions and carbide particles in the material are fine and diffuse, which will cause For precision ball bearing manufacturing, deformation after heat treatment process, uniformity of mechanism, etc. (The uniform fine carbides in the high-grade bearing steel and the fine carbides evenly distributed after the heat treatment process) To improve the purity of the bearing steel, the oxygen content in the steel must be controlled first, and ppm (parts per million) is used in ironmaking 1) In terms of oxygen content, generally speaking, steel with 8 ppm is a good steel, while high-end bearings require top steel with 5 ppm. In addition, if harmful elements such as titanium are left in the steel, it is easy to produce multi-angle inclusions, which will also cause local stress and cause fatigue cracks, which should be dealt with with all our strength. At present, with the improvement of the steel high-purity smelting plant platform system, the purity of bearing steel has been greatly improved, and the level of inclusions has been effectively managed. The oxygen content in steel in overseas developed countries has been kept below 5ppm. The content, distribution, and size of carbides have gradually become important factors that restrict the quality of bearing steel nowadays. Only when the torque is accurate can the rotation be stable! This article is from Co., Ltd., manufacturing precision ball bearings for 37 years, please indicate the source and link for reprinting (http:// )
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