Several different applications in the field of China

In wind turbines, shield construction machine such as the use of very large N process can protect 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 shield with large wind power bearing, main bearing. In terms of bearing material, heat treatment, the service life and reliability of the rolling bearing in addition to with bearing steel material quality, also with material has close relation with the heat treatment, such as WZ6 aircraft launch main bearing the original life have only process after reinforcement, the life of more than doubled. The MRC SKF bearing company by changing the heat in the arts, making M50NiL fracture toughness values of bearing steel increased from 350 mpa m. to nearly 700 mpa, research, development, and new type of heat treatment process of bearing steel material, to improve the quality of bearing steel material and stability, and the design of the bearing is space, improve the service performance of precision bearing has great significance usually bearing steel heat treatment technology has the following several kinds: conventional martensitic hardening, bainite method, such as horse might fire, surface quenching method, induction through heating the surface might fire, etc. Existing various bearing heat treatment research main 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 control, and optimization and to improve the performance of the bearing material submitted to the general, the host ChongXingHua, quick running, motors, bearing the use of the environment more and more diversified, can also come to the 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, surface coating technology and laser surface treatment technology of high-energy east wood, etc. Foreign production, has been used in domestic is still in research stage in recent years, the university of Colorado mines Sper as in might fire steel stable within a certain amount of residual austenite, put forward the distribution of carbon ( uenching分区,QP) Technology, can ensure that the fire at the beginning of high strength steel plastic and sex, on the basis of technology, zu-yao xu academician in 2007 suggested that using the new technology of heat treatment: carbon might fire allocation tempering ( QPmI 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 stiffness and stiffness. Bearing stiffness calculation is based on the bearing dynamic model is complete, and the theoretical analysis about the bearing damping to the slow progress so far. In addition, the bearing stiffness and damping of the 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. The life of the rolling bearing is caused by internal friction bearing, roller bearing friction mainly includes: between roller and bearing inner and outer ring spin, embellish dhi viscosity friction and bearing load caused by friction. At present, the calculation method of bearing heat generating global main draw method two kinds. There are two main types of rolling bearing heat transfer analysis: thermal network and finite element method.