The problems existing in the domestic high-end bearing

In high-end manufacturing equipment fields, bearing the face of the numerous factors to choose. With the improvement of working condition parameter, the bearing during operation have been many to explore new phenomenon, and urgently need to develop a new design theory. At the high end of the work of the machine tool rotary table, in order to improve the machining accuracy, the workbench rotation speed further improved, and the workbench of the accuracy requirement also rises into a step. For the large machine tool rotary table, high-speed stability problem is an important factor affected the accuracy of machine tool, because you need to study large hydrostatic thrust bearing performance calculation, design, processing and assembly, and other problems. Working surface in high precision small type on the turntable, needs to develop gas floating and maglev technology and multi-axis turntable bearings. Unit at the same time, with the development in the direction of large-scale, high speed, high efficiency, high speed bearing dynamics problems, also become important thermodynamic problems. Under the working condition of high speed or overloading, bearing the distortion is inevitable. , shaft structure of the large bearing inner heat will cause the uneven temperature field in the deformation of the bearing and shaft neck namely thermal elastic deformation, makes the size and model of the lubricating oil change, a direct impact on the bearing temperature field distribution and the oil film pressure field distribution, makes the classical lubrication theory study of adiabatic and isothermal assumption is no longer comfortable to use, also can't simply press the 'effective viscosity' approach to deal with thermal effect problem, must consider tribology problem systematically. Under the working condition of heavy load or thin film thermal dissipation is the main problem. Such circumstances, the need to be considered in the design flow, more solid, thermal physical field coupling problem, development is suitable for the strong interaction coupling analysis model of the bearing surface microstructure and the ultra smooth surface technology: high speed, the energy consumption of fluid lubrication bearing could reach 50%, selected with the bearing friction energy dissipation as high as one hundred billion yuan a year, micro machining, the friction surface microstructure morphology factors already becomes the key to improve lip slippery character. Micro-nano structure and ultra smooth surface can reduce the coefficient of friction to achieve orders of magnitude, thus get the shaft bearing structure of the innovation. In addition, with the aid of micro-nano sensors and brake, bearing can develop intelligence, according to the condition changes, automatically adjust to the optimal working condition, will greatly improve the performance of the bearing. 2. Sliding bearing in accordance with the requirements of the high-end bearing manufacturing technology, the size of the machining accuracy and shape accuracy is heading for submicron level, for the requirement of the ultra-precision machining equipment is put forward, the requirement for the surface integrity of cutting, grinding process to do in-depth research. Sliding bearing production worker art mainly have heat treatment, machining and casting. ( 1) Heat treatment of sliding bearing directly related to the subsequent heat treatment processing quality, so that affect parts using performance and life. As the host of the high speed, ChongZaiHua, bearing more harsh working conditions, the performance requirements of bearing more and more high. To reduce the volume, weight, increase the bearing capacity and prolonging service life, improve the product reliability become the main direction of product optimization design at present, domestic bearing life and reliability problems of growing, it has a lot to do with the quality of the heat treatment process. Therefore the development of new heat treatment technology, improve the quality of heat treatment has been bearing enterprises both at home and abroad on topics of mutual interest. ( 2) Machining after heat treatment of the blank in the process of sliding bearing production need for roughing and semi-finishing and finish machining processing equipment and testing equipment precision directly determines the accuracy of the product. Therefore, improve the performance of sliding bearing for high-end high-performance equipment for the shaft bearing manufacturing ( Such as lathe, milling machine, bed, a bed, etc. ) And advanced testing equipment has cut demand. The degree of automation, digitization, is an important development of enhance the level of domestic bearing manufacturers quadrangle and perfect, improve equipment current domestic production enterprises of sliding bearing on these devices is relatively backward, accelerate the improvement of the equipment