Views:0 Author:Site Editor Publish Time: 2021-08-10 Origin:Site
The size of the mill roll bearing is limited by the installation space of the rolling mill (the inner diameter and outer diameter of the bearing depend on the diameter of the roll neck and the roll body). The cross-section of the bearing is small and belongs to thin-walled bearings, and they must also bear larger radial loads. Therefore, multi-row roller bearings are used.
At present, four-row cylindrical roller bearings and four-row tapered roller bearings are mainly used, as well as double-row cylindrical roller bearings and double-row tapered rollers. Most tapered roller bearings use hollow rollers and strut cages. In order to improve the lubrication conditions of the bearing, oil grooves and oil holes are respectively opened on the outer surface and end surface of the bearing. When it is in clearance fit with the roll neck, the inner surface of the inner ring of the bearing Spiral oil groove is set on the top.
The structure of the mill roll bearing is determined according to different types of rolling mills, different working conditions and different structural configurations. Generally speaking, four-row cylindrical roller bearings are easy to obtain higher machining accuracy, so they have high-speed rotation characteristics and are easy to install and disassemble. After the inner ring is pressed into the roll neck, the inner ring raceway surface can be Surface grinding at the same time is beneficial to improve the rolling accuracy. It is mostly used for the back-up rolls of high-speed and high-precision rolling mills. The four-row tapered roller bearing has large carrying capacity and can bear radial load and axial load at the same time. It is suitable for low-speed and medium-speed rolling mills.