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Bearing and bearing steel skill requirements and production levels
Source: China Bearing Network Time: 2014-01-12
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China's bearing profession has been carried out until now; it has appropriate production planning and high skill and quality level. There are more than 1,500 bearing companies with certain planning; the number of employees has grown to nearly 800,000; the annual output of bearings has been from 1949. The 138,000 sets have been added to the current 2 billion sets; the number of bearing types has been increased from more than 100 to more than 7,000; the standard is more than 28,000. For the past 10 years, foreign famous bearings (such as SKF, FAG, NSK, NBM, KOYO, TIMKEN, TORRINGTON, etc.) successively invested and set up factories in China; the progress of bearing skill level in China; the standard of production technology and production management, the modernization of production level, the quality of products and the improvement of application function It has a great push effect.
But on the other hand; China's bearing production companies also face fierce competition and competition from well-known foreign bearing companies; their achievements will accelerate the adjustment of the industrial structure and product structure of China's bearing industry; it can be said that the opportunity and the coexistence of the battle, production and Carry out the same. How to seize the opportunity; improve the company's livelihood ability; how to continue to live together in the livelihood, rapid development is a problem that can not escape in the face of China's bearing profession, can not escape.
At present, China's bearing output has reached more than 2 billion sets; the output has exceeded 20 billion yuan; the annual export volume has exceeded 770 million sets; the foreign exchange earned by exports is about 700 million US dollars; the international ranking is 4th; and 70% of the domestic demand products are satisfied. Above; satisfied with the required quantity of more than 90%; export volume is also increased by a higher share.
In China, we have entered the ranks of international bearing production countries; we also need to see the bearing industry low, scattered, and poor problems; general micro, small, medium and small deep groove ball bearings are still producing at many low levels; causing severe oversupply Because the market competition is fierce; the price war is getting more and more intense. If this situation continues for a long time; it is necessary to affect the entire bearing professional skills transformation and skill advancement; affecting the international reputation of bearing products in China; severely restricting the bearing industry in China Healthy development.
Bearings with strict quality requirements and high skill added value still require a lot of imports. For example, car bearings, high-speed, quasi-high-speed railway bearings; various imported equipment repair bearings; some high precision, high added value and use under special working conditions The special bearing supply gap is large; the bearing products produced in China have a large distance from foreign famous companies in terms of function and price ratio, high precision, low noise, long life and high reliability.
Rolling bearing parts should be under the stress state and high stress value such as stretching, shrinking, tortuosity, shearing, alternating, etc.; work at high speed and for a long time. Therefore; the requirements for rolling bearings are:
1) High resistance to plastic deformation;
2) High anti-collision and wear function;
3) High rotation accuracy and scale accuracy;
4) good dimensional stability;
5) Long service life and high reliability.
In order to satisfy the above requirements for the functions required for rolling bearings; the following basic functional requirements are proposed for bearing steel data:
1) high touch fatigue strength;
2) After heat treatment, it should have high hardness or hardness that can satisfy the functional requirements of the bearing;
3) high wear resistance and low conflict coefficient;
4) high elastic limit;
5) outstanding impact toughness and fracture toughness;
6) Outstanding dimensional stability;
7) Outstanding rust prevention function;
8) Outstanding cold and hot processing functions.
The quality bump of the bearing steel data plays a vital role in the processing quality, service life and reliability of the bearing products. Currently; following the rapid development of China's bearing industry; the number of bearing products matching the domestic host manufacturers Or the number of external exports; each year is increased at a relatively large growth rate; the demand for bearing steel is the same as a larger share. According to incomplete statistics; the annual demand for bearing steel in China has reached 1.5 million in recent years. About tons (including high carbon chromium bearing steel, carburized bearing steel, stainless bearing steel and special bearing steel).
At present; the oxygen content of bearing steel produced by special steel mills in most domestic countries can be satisfied with the requirements of the new national standard; the oxygen content of die-cast bearing steel produced by special steel mills with good quality bearing steel can be controlled in the range of 9-20ppm. The oxygen content in the continuous casting bearing steel can be controlled within the range of 6-10ppm. It can be seen that the oxygen content in the bearing steel produced by the special steel producers in China is close to the level of the advanced countries producing bearing steel.
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