The development of China's high-end bearing ( 2)

In wind turbines, shield construction machine such as the use of very large bearing material, a secret, because of foreign materials research technology of precision machining part wind high-end bearing material still rely on import, bearing steel for the development of new steel grade can not adapt to have a heavy load, high reliability and large wind shield bearings, bearings. In terms of bearing material, heat treatment, the service life and reliability of the rolling bearing, except with the quality of bearing steel material and material has close relation with the heat treatment, such as air WZ6 launch main bearing the original life only 300 h, after processing to strengthen, the life of more than doubled, the MRC SKF bearing company by changing the heat treatment technique and making M50NiL bearing steel cut fracture sexual values increased from 350 mpam2 to nearly 700 mpa ・ m, so the development and research the new heat treatment process of bearing steel material, to improve the quality of bearing steel material and stability, and improve the precision bearing design space, improve the service performance of precision bearing is of great significance. Usually bearing steel heat treatment technology has the following several kinds: conventional martensite method, bainite chamber method, isothermal martensite as Ning method, surface chamber method, induction through the heating surface of a fire, etc. Existing various bearing heat treatment research mainly focuses on hypereutectoid carbide morphology control, austenite grain refinement belongs to the group control of mesoscopic scales, such as has not been seen in sub-micron and nanometer scale for bearing steel material organization regulation, further optimize and improve the performance of the bearing material on host ChongXingHua, quick running, motors, bearing the use of the environment is more and more diversified, can also more to more demanding on the bearing performance, at present our country's existing bearing steel can not meet or can not fully meet the requirements of the host of bearing. Based on this, the bearing parts production at home and abroad to introduce a batch of strengthening technology, mainly include: ion implantation technology, coating technology and laser surface such as high energy beam surface treatment technology, etc. Foreign production, has been used in domestic is still in research stage. In recent years, the school of Colorado mines Speer, etc in hardened steel stable within a certain amount of residual austenite, put forward the fire distribution of carbon ( 淬火- partitining QP) Process, the guarantee of plasticity and high strength steel fire cut. On the basis of QP process, zu-yao xu academician in 2007 suggested using the new technology of heat treatment: fire carbon allocation tempering ( QPT) Art, through the QPT processing to achieve the optimum combination of each phase in the microstructure of, can improve the comprehensive mechanical properties of QPT steel, new QPT heat treatment process, can effectively control the martensite, bainite and retained austenite and carbide morphology and volume fraction, and can effectively eliminate the internal stress of steel material, is a microscopic scale, Nanometer scale) The microstructures and properties of steel in regulation of innovation. If QPT can be applied in bearing steel composition adjustment and new art development, for the new varieties of bearing steel material research and development, to improve the precision bearing design space, improve the service performance of precision bearing, meet the needs of the major equipment technology in China is of great significance. ( 3) Research direction according to the load bearing stiffness and damping, the bearing stiffness of radial, axial and Angle stiffness; According to the running condition, bearing stiffness is divided into static state degree and rigidity. Bearing stiffness calculation is based on the bearing dynamic model is complete, and theoretical analysis about the bearing damping is slow until recently. In addition, the bearing stiffness and damping of measuring method has also been a research hot spot, 4) Heat production and heat transfer analysis of high-speed rolling bearing condition of machine tool bearing heating is the main factor influence to further improve its speed. Hot rolling bearing life caused by internal friction bearing, roller bearing friction mainly includes: between roller and bearing inner and outer spin, sea slip agent viscosity friction and bearing load caused by friction. At present, the calculation method of bearing heat generating mainly has two global method and local method, the method of rolling bearing heat transfer analysis there are two main types: thermal network and finite element method