1905, the young Swedish textile technician Wingqvist invented the self-aligning double-row ball bearing, which brought the bearing technology into a new era. SKF was founded in 1907. Only five years after its establishment, it set up its first office in China. SKF has a long history in China, as well as SKF China Co., Ltd. and its 14 office in China. SKF is actively exploring various possibilities of developing its business in China, so as to further establish a production base and expand the China market.
SKF Group is the world's leading supplier of rolling bearings and seals. Its business scope includes bearing manufacturing and seal production and the promotion of bearing related tools, providing customers with various solutions and services. SKF's business is divided into five major departments: industrial department, automobile department, electromechanical department, service department, aerospace and steel department. Each business unit provides services to the global market, focusing on customers and industries related to its own business. SKF attached great importance to product quality, technical research and market development from the beginning. In the Netherlands, we have our own SKF professional research institute, and the group has invested great efforts in technical research and product development. SKF invests 65,438+07% of its annual sales in research and development, and constantly obtains various inventions. On average, 2-3 new inventions and patents are produced every day, setting new standards in the field of bearing technology and introducing new products to the bearing market. The main advantages of SKF Group include technical support, equipment maintenance service, equipment condition monitoring and technical training. SKF is a global multinational enterprise with more than 65,438,000 manufacturing plants around the world. SKF has more than 40,000 employees and 8,000 offices around the world, and its own distribution agencies in more than 65,438+030 countries, supported by more than 65,438+05,000 dealers and agents around the world. With high-quality products, perfect global logistics system and good after-sales service system, SKF, a multinational company, has become a brand in the world bearing field.
SKF entered China as early as 19 12, and greatly expanded its sales and trade business in China. SKF is committed to cooperating with well-known domestic bearing enterprises. SKF Automobile Bearing Co., Ltd. was established in 1994, Beijing Nankou SKF Railway Bearing Co., Ltd. was established in 1996, Dalian SKF bearing co., Ltd. was established in 1998, and SKF (Shanghai) bearing Co., Ltd. was established in 200 1.
Of course, if you buy SKF bearings, you must learn to accept them: here are some ways to accept them.
1, various mechanical scars, such as abrasions, scratches, rolling, bumps, etc. , it will cause poor bearing installation, eccentric load and stress concentration, and reduce the rotation accuracy and service life.
2, rust, black skin and pockmarks, the latter two are defects that are easy to store moisture and dirt, and are most likely to develop into rust. Corrosion is the pollution source that leads to poor installation, early wear and fatigue, and serious corrosion will make bearings scrapped.
3. Cracks in raw materials, forging cracks, heat treatment cracks, grinding cracks and other cracks will become stress concentration sources, and will spread rapidly in the future operation of bearings, leading to bearing fracture, which will have a great impact on bearing life and work safety. In fact, for bearings with important uses, the bearing factory has carried out 100% magnetic or radiographic inspection of its components.
4, peeling and folding, these two defects are not firmly combined with the base metal, and there are often different degrees of decarbonization or carbon deficiency around them, and the material is easy to collapse, sag or wear, which is very unfavorable to the life and accuracy of the bearing.
5. The riveting or welding quality of the cage mainly depends on whether the rivet head is offset, skewed, slack, short of meat or "double eyelids", whether the welding position is correct, whether the welding spot is too large or too small, and whether the rolling body is stuck due to poor welding or excessive welding.
The above items are the key inspection parts for our inspection of SKF imported bearings. Except for the above-mentioned parts, if the typing quality is poor, such as illegible handwriting or broken handwriting, it should be considered as defective, and serious cases can not be accepted.
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