完美的世界 1993 电影,欢乐颂小说

Great breakthrough has been made in bearing steel technology and new changes have been ushered in in the bearing industry
In a recent interview with Northwestern Polytechnic University, the reporter learned that the powerful spinning technology (PTR) developed by Professor Liu Dong and his team in the school of materials of Northwestern Polytechnic University has made a major breakthrough and solved the problems in the development of related industries in China.
04-23
Four points for attention when installing split bearing
The split bearing unit includes cylindrical roller bearing, bearing seat, bracket seat and some connecting parts. The bearing, bearing seat and bracket seat are all split 180 ° along the axial direction, which is easy to install and disassemble. Because of the split bearing installation and disassembly, can effectively save the disassembly time, reduce production costs, improve production efficiency. But the installation also needs some matters, otherwise it is also easy to cause damage to the split bearing, according to the understanding of China bearing network, share the four matters needing attention when installing the split bearing.
04-23
Research progress of rolling bearing life and reliability application
Summary: with the rise of industrial big data and Internet of things, the research on bearing life and health detection will be pushed to a new height. Based on big data, the research on health status evaluation and operation state prediction will help improve the reliability of bearing equipment, avoid deterioration of bearing health status and prolong its working life. This paper summarizes the achievements of bearing health testing and life prediction at home and abroad, and prospects for it. Although some achievements have been made in the existing research, there are few researches on the key technologies such as the operation data collection, degradation fault characteristic information extraction, health status assessment and residual life prediction of bearing equipment. Therefore, it is of great theoretical significance and application value to further improve the service life of bearings.
04-23
Factors affecting fatigue life of bearing steel
The comprehensive mark of the internal quality of bearing steel is fatigue life. Some scholars have put forward the view that reducing oxygen content still has not played a significant role in improving the fatigue life of bearing steel. In fact, only by reducing the content of oxides and sulphides can we fully tap the material potential and greatly improve the fatigue life of bearing steel.
04-23
How to distinguish bearing accuracy? Bearing tolerance class
The key of bearing tolerance grade is to determine according to the rotation accuracy of shaft to support point.
04-23
Ferrule and rolling element materials
Rings and rolling elements are usually made of high carbon chromium bearing steel. Ccr15 is used for most bearings, and ccrl5simn with good hardenability is used for bearing rings with large cross section and rolling elements with large diameter. The high carbon chromium bearing steel is an integral hardening steel, which can be hardened in both the surface and the center. It is the best material for rolling bearings.
04-23