The bearing we use the degree of precision machine tools

0 spindle, processing it. 1 to 0. 15 mm holes, the efficiency of up to 400 times/min, the West wind company adopts throttling bearing, double row holes working speed can be up to 25 x 10 r/fmin, carrying capacity of 50 n, ABT the company adopts hemisphere structure bearing, the speed above 6000 m carrying capacity in 500 n, the radial stiffness of 67 n/PM, axial stiffness and NVP accuracy is 0. 05 = m, Toshiba, achieve gopm axial and radial stiffness, rotary accuracy of 0. 05 PM, Moore, companies in the United States production of five-axis linkage ultra precision machine tools, air bearing spindle speed 20 ~ 2000 r/min, the spindle rotation error is 0. Development of 025 m, the British Pretech company used in the air of the motorized spindle nanoscale machine, rotary accuracy is 0. 5 PM, the highest velocity 16 x10r/min. Moore, companies in the United States, the precision of the spindle radial and axial movement 12. Less than 5 mm, the axial and radial stiffness reached 20 n/PM and 140 NPM, the company's high precision micro grinding machine grinding spindle radial and axial motion precision within 50 nm. British Cranfield university to develop the advanced grinding machine, the spindle static stiffness of the axial and radial 400 NPM and 100 n/am respectively, the maximum speed of 600 / min. Machine tool developed by the British Loadpnit company, axial and radial motion error is less than zero,. 5 PM, 1 s series electric spindle speed 18000 / min, the axial and radial motion accuracy is within 20 nm; SP series, the speed is not high, the movement precision reached 15 m radial bearing capacity reached 1000 axial and radial motion accuracy in 50 nm to 175 m and n/PM, spindle head of less than, HD series of motorized spindle, the axial and radial stiffness of up to 350 n respectively by using demand traction abroad high-end gas bearing theory research and practical application of progressive development, and domestic demand for gas bearing in recent years, with the upgrading of products to increase, and technical reserve is insufficient, therefore has a lot to the development of space development with independent intellectual property rights of gas bearing, can't just be measured imitation of foreign existing products. Need to increase investment in mature product development, on the basis of digesting and absorbing foreign technology characteristics, active efforts to develop the gas bearing with independent intellectual property rights. To develop miniature gas turbine foil air bearing as an example, to copy the same products abroad, the main domestic development of technical route, after nearly 10 years of development, more difficult, yet get breakthrough, greatly influenced the application of this technology in our country. For gas bearing technology research and development, therefore, should give priority to go independent research and development, draw lessons from foreign experience which is the main route of in short, China's high-end sliding bearing in application technology, on the whole, still far behind, in such aspects as material, the craft is quite different with foreign. Many high-end technology is still at the laboratory level, technology application and industrialization process is facing difficulties, industry level is not enough. In many areas of the national economy at present, most high-end sliding bearing market to foreign suppliers into a large number of sliding bearing are imported or technology transfer in accordance with the machine. One and stop supply abroad, China's national economy will face a huge crisis. In the field of national defense, China's high-end sliding bearing manufacture degree is higher, but the basic focus on research and development and application of forces and the colleges and universities and research institutes. Enterprise level, the development of high-end sliding bearing basic forms a traction model, designed industry of sliding bearing company strength enough: surface and domestic high-end bearing product promotion is difficult, particularly difficult in terms of user recognition and acceptance; Companies are professional and technical personnel, technical communication stopper, when bearing problems often can only rely on foreign supplier technical support. Despite the difficulties, but the good news is that at present our country large overloading of the generator shaft bearing, rolling mill bearing, ship stern shaft bearing, the respect such as aircraft engine sliding bearing has made a breakthrough, industry scale expands gradually, and customized are also speed up the pace. China's high-end bearing application technology development and industrialization road is still heavy.