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Date:2011-11-05 11:30:02
The world no matter which kind of import bearing code with letters and Numbers according to certain rules to arrange a combination, used to show the structure of bearing type, size, material, technical requirements and feature, the code role see it is a kind of identification markings are manufacturers and users of the common language communication. So code should be simple, clear, and should be systematic, standardization. Import bearing code and not to begin with, it is a country with the development of industry, the demand of the bearing and developed gradually. Import bearing relative complex machine for, although structure is simple, but it is the basic mechanical components, application is quite widespread, the application situation and working conditions of different, decided to bearing the structure of grain varieties of diversification. Factory to meet the needs of the various users, continue to improve, the unceasing development, in the process of development, manufacturers in order to make these bearing said with the original bearing is different, and added some new symbols. It supplemented unceasingly, the development of the company gradually formed code system. The company established after the existing code and often used in the development of production add further, so as to form and the differences between the similar company different code system. National standards in every company code is on the basis of design of seek more common grounds while reserving differences. The industrial development of the early from Europe, America, Japan, Sue earlier made bearing code standards, due to the development of the situation is different, between countries different code, or even a country in each companys code is not completely the same.
Import bearing the different international code to the trade and technical exchange bearing a major inconvenience.
International organization for standardization 1 SO/TC4 rolling bearing technology committee, in the early 1950 s of the uniform code bearing efforts, and established the code drafting group. 1963 ISO/put forward R300/1 the rolling bearing ISO code method ". This standard speaking is also a more complete and scientific, systematic strong generation, a standard method. But the standard is out of all countries did not get the approval. This is because the code in a country, a company (factory) formation system, it is broad, not only to the factory itself products, design drawing, bearing process files, product samples, packing, etc have influence, but also related to other departments product drawings or design manual revision. Bearing industry developed countries (company) its bearing products in the international a reputation, has certain market, its bearing code already for as is known to all, they most avoid code changes, code a change might affect their the sale of the products, be in usually is not easily, with the consent of the proposed scheme of ISO also wont be interested. ISO/R300/1 finally had to oneself cancel. So, bearing code so far, there is no international standard.
Since the bearing is extensive use, import bearings manufacturers in the world very much, bearing industry development first and developed countries have Sweden, Japan, the United States, Germany, etc, the international well-known imported bearing company has SKF NSK, NTN, KOYO, FAG, INA, TIMKEN, each company has its characteristic each, some are various types are production, such as SKF NSK, NTN, FAG has a complete set of code system; Some are professional in the production of such as TIMKEN taper roller bearings for representative; INA in production of needle bearing represented. The company has a long history, the specification is complete, the code system is reasonable, in the world have certain representativeness.