High-end research and development present situation and the analysis of bearing

( 6) High precision bearing precision research is typical characteristics of high-end machine tool bearings. Bearing accuracy of relevant theoretical research include: rotary precision modeling method, parts manufacturing error and lubrication on precision analysis, the influence of the forming mechanism of bearing the repeatability accuracy, working condition of the precision of and so on. ( 7) Bearing damage and failure mechanism due to the working condition of structure is more complex and more strict, the mutual coupling effect of various factors, therefore, high-end bearing damage and failure mechanism is far more complicated than the conventional rolling bearing. In aircraft engine spindle bearing, for example, due to occur under high temperature, high speed surface interface damage and appear early failure, most of the actual service life of the spindle bearing less than based on rolling contact fatigue life prediction. Premature failure of the aircraft engine spindle bearings mainly includes the skid injury, wear and corrosion, cut pit, and maintaining the frame damage and fracture forms. These failures and the surface of the bearing under harsh conditions interface behavior are closely related. Organs of the general bearing failure is caused by the surface crack generation and propagation of fatigue to fall for the characteristics of the 1940 s, Swedish scientists Lundberg and Palmgren on the condition of rolling contact for development and application of Hertz contact theory considering the probability distribution of internal defects in material put forward the famous bearing rolling contact fatigue life prediction theory formula ( Also referred to as 'LP theory) , after decades of correction, formed the bearing fatigue life design of international standards, but for the microscopic contact damage is the result of rough surface peak, rigid particles in lubricating oil pressure into the surface damage caused by such surface fatigue wear and corrosion problems, but there was no life prediction model of widely recognized, and for aeroengine common light load high speed spindle bearing skid ceng injury such failure forms, L - P theory does not apply, and there is no predictable give injury occurs, give theory formula of injury degree. Therefore, theoretically analysis and forecasting these bearing surface interface failure issues that need to be in the existing rolling bearing fatigue mechanics theory framework development across the scale on the basis of theoretical model, further to the surface of the micro and nano material, structure, and the contact interface of lubrication and gelling behavior of the above research work although some progress has been made, but because of the complexity of the internal contact, lubrication bearing, theoretical model and calculation method on a lot of work to be deep, such as because of the uncertainty of the lubricating oil properties and rolling bearing of the complexity of the sports law rules, rolling bearing dynamics analysis results for the design and application of no significant guiding role: as a result of bearing heating, cooling and other mechanism research is not thorough, bearing temperature prediction and thermal coupling analysis of foreign famous bearing enterprises in the current slow progress on the basis of theory development, combined with years of experience in research and development of the enterprise, is committed to more accord with the actual operation situation bearing performance analysis tool development, such as development of SKF BEAST software without the raceway control hypothesis dynamics simulation, abandoned the traditional bearing NSK company BRAN software calculation 'pure' hypothesis, during the implementation of the bearing rotation dynamic multi-functional, comprehensive simulation analysis. Most domestic bearing enterprises design the main force in the structure and material, and to optimize the heat treatment is given priority to, the lack of basic theory, application, theoretical research and enterprise's product design in colleges and universities not form a good docking, theoretical achievements cannot be converted to effective productivity