As the core component of mechanical equipment, the outer ring full roller bearing supports the mechanical torsion body, reduces its friction coefficient, and ensures its reverse rotation accuracy. Regardless of aircraft, automobiles, high-speed rail, or high-precision machine tools, instrumentation, any part that can be rotated requires this part of the component - bearing. The small full-roller bearing without an outer ring may seem inconspicuous, but it is an important standard for measuring a country's technological and industrial strength, and is also regarded as the 'heart of mechanical equipment'. In our lives, low-end bearings are almost everywhere, but high-end bearings are very valuable. The difference between low-end bearings and high-end bearings is the vibration amplitude and wear condition. If a bearing has a small range of motion, low wear rate, and low fever, there is no problem, it is a high-end bearing. Although bearings can be seen everywhere in China, my country does not have the conditions to manufacture high-end bearings. High-end bearings are another neck-locking technology that cannot currently be replaced by domestic products. At present, the import environment trend of China's high-end bearings is mainly concentrated in Germany, Japan and other prosperous countries. In actual use, the same type of high-end bearing products, the life of the bearings manufactured in the country is 30 times that of Chinese bearings! Where is the gap between domestic bearings and developed country bearings? 1. In terms of bearing accuracy, although the dimensional error and torsional accuracy of domestic bearings are very close to those of imported bearings, there is still a certain gap in separation. In addition, foreign countries have already begun to study and use such precise torque accuracy indicators as 'non-repeatable beating', but China's research in this area is almost vacant. 2. In terms of bearing vibration, noise and abnormal sound, Japan has introduced silent and ultra-quiet bearings, while the vibration extreme level of Chinese bearings is generally more than 10dB different from that of Japanese bearings. 3. In terms of bearing life and reliability, taking deep groove ball bearings as an example, the life of imported bearing products is generally more than 8 times the calculated life (up to 30 times or more), and the reliability is more than 98% (or the pursuit of the main engine, etc.). life), while the life of domestic bearings is generally only 3 to 5 times the calculated life, and the reliability is only about 96%. 4. In terms of high-speed performance of bearings, the DmN value of imported bearing products can reach 4 million r/min/mm, while domestic bearings are far behind in this regard. my country is a big bearing country, but not a bearing power! China is the undisputed super country of bearing. As early as 2014, China's bearing output reached 19.6 billion sets, ranking third in the world. Our bearing output can support the decompression toy like fidget spinner, which accounts for one-fifth of the world's output. The small bearings made in China have a diameter of 0.6 mm, and the large ones are 11 meters in diameter. However, my country's bearing manufacturing is mainly based on low-end products, and high-end bearings are in short supply, always relying on imports. High-end bearings, with high operation, high load capacity, long life, high reliability, low touch noise and low friction performance, are suitable for large aircraft, high-end automobiles, high-speed rail, heavy-duty weapons, elevators, high-end CNC machine tools, wind power and other The key component of the mechanical equipment, the main function is to support the mechanical torsion body, reduce the conflict coefficient and ensure the inversion accuracy. In layman's terms, the smaller the conflict between the bearing and the shaft, the less oscillation and the less fever, the better the bearing will be. The performance of high-end bearings mainly depends on the material properties and processing technology. As the world's largest steel country, although we have crushed the world in most steel products, we are still significantly behind Taixi and Japan in the smelting of high-strength, high-wear-resistant bearing steel. In addition to bearing steel that cannot meet the needs of industrial manufacturing, domestic high-end bearing manufacturing requires high-precision, high-stability, and high-reliability machine tool equipment, especially grinders. The equipment for such processing requirements is mainly used in small batches of countries such as the United States, Japan, and Germany. control. At present, more than 70% of the high-end bearing environmental trend is occupied by the top ten multinational bearing group companies, of which the United States accounts for 23%, the European Union accounts for 21%, and Japan accounts for 19%. The foundation of the world's bearing environmental trend is dominated by five major companies such as Japan's NSK, Sweden's SKF, Germany's FAG and other two companies, and the United States' Timken and other companies.
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