Angular contact ball bearings in fracture failure to determine reliability

Angular contact ball bearing of the working reliability and life expectancy, even in good working condition, there are certain dispersion. For important equipment, especially the work in the harsh conditions of equipment, it is equipped with angular contact ball bearing of reliable or not, how long can also continue to run, sketching become particularly concerns, use department at the same time it often and obvious economic benefit or loss is directly related to the serious accident, so the diagnosis technology of natural be use department pays attention to technology development. About TIMKEN bearing diagnosis and maintenance on the international theories and research, mainly by the large bearing companies under the auspices of the finished, its purpose is to market and product development. And our country in the past mainly by reference to the Soviet union's management mode, and rolling bearing in our country is the emperor's daughter don't want to marry 'popular commodity, therefore, less bearing manufacturing and research department focus on the path and direction, so that rarely to provide customers with the use of rich and colorful, practical technology, and the corresponding service dedicated to scanning electron microscopy at high magnification observation of fracture site, find its characteristics are the following: (1) magnification observation, micro area appears many fan pattern morphology. (2) the crack front there is a fatigue curve and a large number of corrosion pit. (3) fan pattern shape is different, different point of view observes the fan pattern is formed different plane crack connection. Observed under high crack extension area, found that the typical fatigue crack; Low-power scan of crack source, can be found that the beach pattern around the crack source, the source of crack area distribution, there is a lot of corrosion pit some corrosion pits connection into line, mud shaped pattern morphology. (4) to accept the highest stress, for water jacket with contact point of the cylinder liner hot muscle. A and B stress is small. TIMKEN bearing water work stress, assembling stress and thermal stress mainly accept bums three types of stress. Water set of hoop stress for the maximum stress, its value is about 128 mpa belong to oily angular contact ball lighter is a kind of random anomaly, abnormal flames burn artifact defects often seriously affect the appearance quality of workpiece and product performance, even cause unqualified failure scrapped, especially on appearance quality requirements of high precision workpiece or important workpiece surface. (5) in the production of observation found that induction heating, artifacts and light sensor happen often isn't a point contact, angular contact ball bearing is very sensitive to noise. So, in order to adhere to the smooth working of the angular contact ball bearing, generally USES the high reliability of sintered bronze oil TIMKEN bearings, but also to take some measures, such as proper control of sintering conditions, make the organization of the alloy is single phase, and can be used anticorrosion technology measures; Another way is to make the compressive stress in the appearance of components, to offset the water jacket in service under tensile stress.