Bearing crack microstress stress
Vibration is a major cause of bearing life. Of course, this statement is more ambiguous, and the vibration mentioned here is actually a general term for a variety of variable load forms, including dynamic loads. According to fatigue, a carrier, when subjected to continuous variable load, will form micro-cracks at the boundary of its internal tissue under the action of stress concentration, and micro-cracks will accumulate and grow, and when the length and number of cracks reach a cumulative amount, macroscopic fractures will occur.
Early people realized that the above fatigue fracture occurred when it was above a certain load. With the development of materials science, the theory of crack tip should be mechanical, and the early understanding was broken, and people entered the research stage of the energy of the fracture zone. However, the basic fracture process is also described above. Of course, to say two more words, the formation of primitive cracks is diverse, organized stress cracks, defect stress cracks and so on. In general, for commonly used rolling bearings, under limited working conditions, the limit life can be calculated according to the manual, and the error is not large. For working in the limit area, detailed calculations are required, such as rain flow statistics, energy accumulation calculations, etc. I didn't learn so deeply, and I didn't see it.
1. According to the mode of movement, the bearing is divided into: plain bearing and rolling bearing
2. According to the force transmission medium, it can be divided into: ball bearing round bearing tapered bearing
Where the use of bearing products, its performance, precision, life, reliability, etc. are closely related to the bearing, in some high-tech products, the bearing has been regarded as the core component. Today we will use pictures to show the development and change of bearings, working principles, types and applications.
Light weight
Strong resilience
Good sliding properties Good marginal lubrication properties.
Operating temperature < +120°a
Technology and intelligent manufacturing
Light weight
Strength
No operating temperature limit + highly shockproof and anti-acceleration.
Bearings are sensitive to poor lubrication.
