The Optimization Design Of The Structure Integration Of Roller And Bearing In Large Strip Mill

With the continuous development of the strength of China’s economy and the rapid development of aerospace, automotive, electronics and other industries, the quality of steel plate and strip is demanded the to be increased. To implement the "Made in China 2025" strategy, high-quality plate and strip is indispensable. For strip mill, the roller bearing is one of the core components of the roll system. Its mechanical properties and service life are related to the quality of steel strip and production costs.Four row cylindrical roller bearings are always used in mills. Because of the elastic bending of the roll in rolling process, the bearings partially load force. There is stress concentration on the rolling element so that the rolling element would be abrased or break-ups. In order to optimize the rolling elements and improve its carrying capacity, it needs to be analyzed.This paper introduced the basic theory of elastic contact. The load distribution of partial load single row cylindrical roller bearing was calculated. Then rolling’s four cylindrical roller bearing a load was analyzed by finite element software. The results showed that there is significant partial load of a roller bearing in the axial direction and the load distribution of the four row is uneven. The load of the center and both ends of the rolling element is small in the circumferential direction. It’s the maximum contact stress at both sides besides the center bearing, load distribution’s figure is similar to the "M" type. The contact stress at the position between the rolling element and the inner or outer rings is so large that the life of the rolling elements would be reduced.The shape of rolling element is optimized to improve its stress state in industrial production. In this paper, two methods, both ends of the logarithmic curve and repair complex exponential curve, were used as the optimized shape of the rolling element which bears the maximum load in bearing. Both methods can effectively reduce the problem of rolling element local stress concentration. It’s stress distribution of the rolling element with the logarithmic curve shape but there is little eccentric load effect. It’s stress distribution of the rolling element with the complex exponential curve shape, but the shape is hard to process.