The essence of the back-up roll is to support the work roll, which can reduce the diameter of the work roll and enhance the stiffness of the work roll by touching the rolling piece. The back-up roll is an important part in the rolling mill, which is used to support the work roll or the intermediate roll to prevent the work roll from bending and affecting the output and quality of the plate and strip. The quality characteristics of back-up roll are high surface hardness, good hardness uniformity, deep hardening layer of roll body, good strength and toughness of roll neck and body and body. The quality characteristics of back-up rolls are high wear resistance, good spalling resistance and strong accident resistance.
The back-up roll is an important part in the rolling mill, which is used to support the work roll or the intermediate roll to prevent the work roll from bending and affecting the output and quality of the plate and strip. The quality characteristics of back-up roll are high surface hardness, good hardness uniformity, deep hardening layer of roll body, good strength and toughness of roll neck and body and body. The quality characteristics of back-up rolls are high wear resistance, good spalling resistance and strong accident resistance. With the development of cold and hot rolling mill towards high speed, large scale and high precision, the demand for back-up rolls is also increasing. From the requirements of modern cold and hot rolling mill back-up rolls on material, roll body hardness, uniformity, depth of hardened layer and residual stress, it is more suitable to choose forged steel back-up rolls. Compared with the composite cast steel back-up roll, the forged steel back-up roll has the characteristics of uniform material, better wear resistance and anti-spalling. Large forged steel back-up roll is a high value-added product, because of its high technical requirements, complex process, difficult manufacturing, production process, long cycle and other reasons, only a few enterprises in China can produce, its output can not meet the market demand, resulting in modern cold and hot tandem rolling mill enterprises used large forged steel back-up roll has to rely on imports.
