China's high-end bearing test technique

2. Bearing test technique, bearing test methods at home and abroad mainly has four kinds: friction and wear test, test bench test, laboratory ( Proving ground simulation experiment, the actual working conditions. The archduke with foreign technology center of the above four kinds of test methods are used, but should use purpose is different, for example, to develop a new product, must first do friction and wear test, and then do platform, simulation or actual operation test. Now, China's bearing industry experiment and detection device's chasing behind, usually only fatigue life experiment was carried out, its his test request for this aspect only in supporting the host enterprises bearing production enterprises to. In addition, with the machine tool bearings to develop in the direction of high speed, high precision, long life, domestic general lack of aiming at these characteristics of experiment and test equipment. 3. Dynamic bearing lubrication technology in sports and failure due to resistance make the bearing wear, grease, Oil) And the different methods of lubrication, to reduce the bearing friction and wear effect is different. Therefore lubrication technology has become an important part of bearing technology research. Many people within the industry has taken the grease ( Oil) The fifth part is referred to as 'bearing' ( Other for inner ring and outer ring, rolling element and cage) The latest bearing design thought, the practical application of general won't because of the fatigue failure of bearing, the fatigue life of traditional design theory is no longer suitable for high speed and high precision bearings, on the contrary, the grease lubricated bearing, its life depends on the life of the grease instead, so can long life, high efficiency of grease and lubrication technology become the focus of foreign companies in recent years are very concerned about. NSK will of tribology and lubrication technology as the four core technology, the development of grease, under the condition of DmN value reached 1. 8 million, life of up to 20000 h; SKF has a strong lubrication research team, established a grease life ( Or add lubricating) The empirical model, developed for different bearing special grease products. NSK and SKF has perfect bearing lubrication and accessory equipment, such as SKF new oil and gas lubrication, trace oil supply system structure and the bearing rotating speed increased by 10% ~ 20%, and domestic bearing enterprises for the study of the grease stay in selection stage, not for specific objects to carry out the corresponding design, bearing lubrication oil in our country is the main research unit of the compound in lanzhou, open lubrication technology research unit mainly include xi 'an jiaotong university, southeast university, Beijing institute of technology, etc. 4. Active control technology state, the high-speed bearing adopts variable pre-load can improve and ensure the effective dynamic stiffness of the bearing. Control of the pre-tightening force calculation of prestressing force technology is mainly manifested in the best, active control, preloaded pretightening force test, etc. Such as SKF of R. T Gilman company on its high-end electric spindle dynamic preload control technology, according to the materials, using the hydraulic pre-tightening mechanism to adjust bearing pre-tightening force, realize the processing quality improvement; Fischer, GMN company also started using controllable pre-tightening technology improve the spindle performance. Domestic research mainly concentrated in colleges and universities, such as in the central south university, xi 'an jiaotong university, China university of science and technology, etc