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How to reduce the gap between China's bearing industry and imported bearings

What are the differences between domestic and imported bearings?

1.Bearing accuracy

Although the dimensional deviation and rotation accuracy of domestic bearings are very close to imported bearings. However, there is still a certain gap in dispersion with imported bearings from Germany. Foreign countries have already begun to study and apply fine rotation accuracy indicators such as "irrepeatable beating," but China's research in this area is still blank.

2. In terms of vibration, noise and abnormal sound

Japan has launched silent and ultra-quiet bearings, while the extreme level of vibration of Chinese bearings is generally more than 10dB different from Japanese bearings.

3. In terms of life and reliability

Taking deep groove ball bearings as an example, the life of foreign products is generally more than 8 times the calculated life (up to 30 times higher), and the reliability is more than 98% (or pursue the same life as the host), while the life of Chinese bearings is generally For 3 to 5 times the calculated life, the reliability is about 96%.

4. In terms of high-speed performance

The DmN value of foreign products is 4 times 106 mm r / min, while the Chinese bearings are only 2 times 106 mm r / min.

Status of China Bearing Development

At present, China's bearing industry ranks third in the world in terms of industrial economy, but it still has a considerable gap with the world's advanced level in terms of product accuracy and technical level. Mainly manifested in:

1. Low concentration of production in China's bearing industry

In the world's bearing sales of about 40 billion US dollars, the world's 8 largest multinational companies account for 75% to 80%. Germany's two major companies account for 90% of its national total, Japan's five companies account for 90% of its national total, and the US one accounts for 56% of its national total. In China, 7 bearing companies with annual sales of more than 1 billion yuan, such as axles, account for only 28.3% of the entire industry.

2. China's bearing industry has low R & D and innovation capabilities

As most enterprises are still at a low level in the construction and operation of innovation systems, capital investment in R & D and innovation, and talent development, coupled with the industrialization of service-oriented research institutes, the country has no research on common technologies in the industry. Investment, thereby weakening the function of industry-oriented research and development. As a result, the industry's "two weaknesses and two minorities" are outstanding, that is, weak basic theoretical research, weak participation in the formulation of international standards, fewer original technologies, and fewer patented products.

3. The manufacturing technology level of China's bearing industry is low

The development of China's bearing industry manufacturing technology and process equipment technology is slow, the numerical control rate of lathe machining is low, and the level of grinding and machining automation is low. Most of the enterprises' main production is still traditional equipment. Advanced heat treatment processes and equipment that are important to bearing life and reliability, such as controlled atmosphere protection heating, double refinement, and bainite quenching, have low coverage, and many technical problems have not been solved. The research and development of new bearing steel grades, the improvement of steel quality, the research and development of related technologies such as lubrication, cooling, cleaning and abrasive tools can not meet the requirements of improving the level and quality of bearing products.

How do we respond and how can we catch up with imported bearings?

Improving bearing research education is imminent

The Japanese bearing giant NSK has 1800 R & D personnel at its headquarters, which is something that Chinese bearing counterparts dare not imagine. In the eyes of many laymen, a bearing is a simple component. Is it necessary to have so many R & D personnel? In fact, the bearings you see in daily life are low-end bearings with low technical content, and the complexity of bearing technology is incomparable with low-end bearings.

Lu Bingheng, member of the Chinese Academy of Engineering, believes that bearing research and development involves a series of technical difficulties such as materials, grease and lubrication, manufacturing, design, bearing manufacturing equipment, testing and testing, and also involves contact mechanics, lubrication theory, tribology, fatigue and failure, heat treatment and materials Organization and other basic research and interdisciplinary.

Academician Lu's remarks showed the complexity of the bearing technology and its difficulty. This also shows that it is necessary to set up an engineering specialty for the bearing. An undergraduate who majored in mechanical engineering with a comprehensive and wide caliber, although he has also learned dozens of hours of bearing lessons, has only learned such a deep knowledge of bearing such a short period of time. The industry is almost equivalent to learning from scratch, it is too time consuming, the working time is too long, and the employer must also carry out a lot of time-consuming and labor-intensive training in bearing professional knowledge.

As mentioned above, the short plates of bearings do not only exist in the field of aero engines. In the fields of high-precision machine tools, high-speed railways, and instrumentation, these short plates still exist, and only we have increased our research and development of high-end bearings. Only by investing in human, financial and material resources can China realize the fundamental transformation from a bearing power to a bearing power.


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