High-end machine tool bearings and high-end automotive bearings

High-end machine tool bearing a few days ago, China's machine tool industry is moving in the 'high-speed, composite, precise, intelligent, environmental protection' five directions, accordingly, machine bed bearing is developing towards the following aspects, 1) High speed: in order to improve the production efficiency, reduce production cost, increasing machine speed. Under the development of professional bearing factory, high speed bearing is increasingly popular. NSK new angular contact ball bearing ROBUST series such as dn value up to 3. 5 x10mm·r / min ( 2) High precision: with the development of high and new technology and customer improvement of performance and quality of high value-added products, machine tool enterprise user has higher requirement on the machining accuracy. The precision of the machine tool bearings from the highest precision of existing P2 level to the higher precision of P2 level development, the rotation error indicators from the previous beating to the current 'non repetitive beats' ( 3) High rigidity, high precision machine tool spindle system dynamic characteristic directly affects the machining precision of the machine tool, rough surface roughness and the work efficiency. The bearing stiffness is one of the key factors influencing the dynamic characteristics of the machine tool spindle system. Bearing materials, pre-load, lubrication and cooling technology and so on all affect the stiffness of the bearing. ( 4) Long life, the service life of the machine tool spindle bearings are usually not according to the fatigue life but according to the accuracy of life ( Or the wear life of life) To assess, this is due to the main shaft bearing rolling element and raceway contact stress is generally lower than the fatigue limit, and lubrication, tight sealing and other operating conditions are good, therefore, in the main shaft bearing design, first was based on the stiffness of the objective function. At present, the accuracy of angular contact ball bearing life can reach 10000 ~ - 30000 ( 5) Environmental protection: the nervous energy, the environment pollution has threaten human survival, energy conservation and environmental protection has been widespread heavy, therefore, saving energy and reducing consumption of high-end bearing appear constantly. In the future, all sorts of energy conservation and environmental protection will accelerate the development of machine tool, will also be more to occupy the market. 5. High-end auto bearing through the analysis of patent technology, it can be seen that the high-end technology development trend of automobile bearing mainly include: ( 1) Bearing structure and performance of micro precision design method and precision manufacturing technology, new material, new structure and new technology in the application of high-end car bearing; ( 2) Wheel hub bearing sealing performance of the strengthened: long life and high reliability of the bearing cavity sealing structure, used to prevent the external pollution into the bearing chamber, less loss of lubricating medium, so as to improve the reliability of wheel for bearing ( 3) Lubrication method and the development of lubricating materials ( 4) Auto-hub bearing bench test and evaluation technology, can simulate the different load test environment, working condition, ( 5) Multi field coupling simulation analysis technology: by establishing performance for different conditions ( Speed, temperature, stress, deformation, lubrication to assess the performance of the wheel hub bearing; Status, etc. ) The finite element model of car wheel, the simulation analysis of the performance of the wheel hub bearing, the design of the guide bearing and wheel