Sendzimir rolling mill bearing is a special bearing used in multi high rolling mill. When in use, it is installed on a stationary shaft in a group form to become a backup roll. The pressure on the work roll is transmitted to the backup roll through the intermediate roll and to the frame through the saddle system. Semir bearings are designed to adapt to a variety of specific working conditions. Two or three row full roller (without cage) or cylindrical roller bearing with cage is the most commonly used bearing structure in senkimir rolling mill.
The structural features of senkimir cylindrical roller bearing are as follows:
● outer ring: the outer diameter of the bearing is in direct contact with the intermediate roll and bears the rolling force while rotating
power. According to the characteristics that the bearing outer ring is directly used as the rolling contact surface, the outer ring thickness is increased, and the special structure is adopted for the bus shape of the bearing outer ring to eliminate the edge stress and effectively prolong the grinding interval of the outer ring surface. It has good wear resistance and operability of regrinding, and still has good rotation accuracy after regrinding;
(inner ring: add special lubricating oil holes and oil circuits on the inner ring and spacer to make the lubricating oil
It can enter the bearing smoothly and has long enough rolling fatigue life
● rolling element: determine the structural size and parent of the rolling element according to the service conditions and characteristics of the bearing
Line shape, so that the rolling element can bear large radial load.
● cage with good toughness in the design,
Reduce the mutual interference of rolling elements during rotation and meet the high-speed requirements of products.
Senkimir cylindrical roller bearing ring and roller lift can be made of carburized bearing steel with core
It has low hardness and certain toughness, and the bearing has good impact resistance; The deep enough surface hardening layer not only ensures the rigidity, but also increases the repair times of outer diameter. The high-quality material structure can ensure high fatigue strength. The mutual difference of installation wall thickness of all bearings used on one shaft is ≤ 0 005mm, the mutual difference of the installation wall thickness of adjacent bearings ≤ 0.002mm (ZWZ data).
See the figure below for the structure of common Sendzimir cylindrical roller bearings.
