Over the past 15 years, the development of Chinese bearing industry

In the past 15 years, 1999 - 2013). , the sliding bearing is supported by the national natural science foundation of total related items ( Content see the CD in the appendix) , the total financing amount to 28. 71 million yuan. More than 60 days studies cover a wide range of content, sliding theory, brush performance, new type bearing structure, bearing rotor system dynamics, etc. , for the hair of sliding bearing technology in our country the first a lot of knowledge, from the perspective of the project quantity and amount of financing, overall presents increasing trend year by year, it is two years later, the basic research project number, grants are also improved. In addition, as many high-end equipment development, bearing research in many large occupy the important component of the basic research project. Such as 973 plan 'nuclear main like scientific problems' project, main pump water lubricated bearing for solution hidden motor, key components manufacturing difficulty, carried out a large of these studies is a deep understanding of sliding bearing working mechanism, grasp the high-end sliding bearing design and manufacture of kimono branch wood provides an important basis for ( 1) Sliding bearing friction and wear mechanism of the main bearing friction and wear mechanism of the bearing parts of the relative motion of the surface of the interactions between the chemical, metallurgy and mechanical action, and then study the bearing mechanism of friction and wear between the surface of materials in the process of friction bearing table surface physical and chemical properties change, in order to better control and predict bearing wear process. As the change of working conditions and product properties, sliding bearing working surface between friction state show different characteristics, can be roughly divided into: the whole film sliding, the lubrication, boundary friction and dry friction condition. The damage forms have scratches, abrasive wear, adhesive wear and fatigue from the left, a variety of forms such as corrosion wear and fretting wear. At present, the research is still in the mechanism of friction and wear mechanism of research has also made great advances. Bearing industry rapid development in recent years, a range of material bearing is becoming more and more big, because the surface friction and wear mechanism of bearing material research more deeply. In terms of sliding friction mechanism, practice has proved that the classical sliding friction theory and formula has great limitation, when the normal load is bigger, makes the actual contact area near the apparent contact area, hard or soft materials friction play palm force composed of no longer meet the proportional relationship between size and the method to the load. For sliding friction elastic or viscoelastic material, the friction force is closely related to the apparent contact area. At the same time, many materials friction coefficient change with size of the sliding speed and load. Outside, the study also found that the length of the static contact time affect the static friction coefficient; Dry friction movement is not a smooth continuous dynamic surface is the movement of discontinuous phenomenon. To describe the phenomena of sliding friction, has formed a number of different friction theory, large Numbers can be summarized as mechanical theory, three kinds of molecular theory and mechanical friction theory. Among them, from the viewpoint of mechanical molecules combined with spring, people are more fully developed the theory of solid friction, in Britain and the Soviet union, have established the time-sharing centered on the theory and is characterized by friction binomial theory school. Gelling theory put forward by Bowden in 1945 that in plastic contact condition, the friction surface sliding friction process is the movement of gelling and sliding occur alternately, and the ShengLi is the effect and the sum of resistance type groove effect. Soviet scholars believe that sliding friction is to overcome the rough surface of machine and the process of the molecular attraction, and combined with mechanical and molecular resistance calculating friction, develop the second law, the experiment proved that binomial law of friction of boundary lubrication, can also be applied to some of the dry friction condition, especially the real department contact friction problem larger area in recent years in the relationship between friction pair morphology and friction, energy dissipation and thermal wedge effect, friction interface behavior of wear resistant coating damage law research aspects, such as a series of achievements, some results have been applied in the bearing, domestic related research, in also made some progress, but the lack of system research and the original results