Roll forming of backup roll suitable for asymmetrical curve roll shape work roll

Abstract

The invention relates to a rolling mill roll of a strip cold-rolling mill, in particular to a roll forming of a backup roll suitable for an asymmetrical curve roll forming work roll. The roll formingof a backup roll suitable for an asymmetrical curve roll forming work roll is formed by overlying two parts of curves, one part is a backup roll forming curve expressed by an even polynomial function,and the other part is the roll forming curve of a work roll; the roll forming of the work roll overlies to the roll forming curve of the backup roll expressed by the even polynomial function at certain ratio. During production, the roll forming curve of the work roll and the roll forming curve of the backup roll are staggered with a certain space when the work roll positively and negatively shifts; as the shifting amount of the work roll is not big, obvious dislocation between the roll forming of the backup roll and the roll forming of the work roll can be avoided. Thus, the backup roll of the invention has symmetrical roll forming and even abrasion after abrasion, thus avoiding or effectively lightening influence caused by asymmetrical abrasion.

Description

technical field [0001] The invention relates to a rolling mill roll of a strip cold rolling mill, in particular to a back-up roll shape of a strip cold rolling mill whose work rolls have an asymmetrical curved roll shape. Background technique [0002] As one of the most important products in the iron and steel industry, sheet and strip play a very important role in the development of the national economy. The current practice of strip rolling shows that no matter how advanced the shape control system and control means are equipped in the rolling mill, there are still problems that the shape of some varieties and specifications of strip steel is difficult to control, and the service life of the rolls is limited due to shape defects. After analysis, it was found that the root cause of this problem was that the rolling mill's shape control ability was limited under a certain roll shape configuration, and the initial roll shape of the rolls deteriorated due to wear during the se...

AI Technical Summary

Problems solved by technology

Due to the influence of asymmetric factors such as incoming wedge shape and strip deviation, it is also easy to aggravate the asymmetric wear of the backup roll

[0005] The main problems caused by asymmetric wear are: 1) the shape of the strip is asymmetric; 2) if there is a closed-loop feedback control, the setting value of the depression inclination is unstable and fluctuates greatly; 3) the asymmetric wear of the backing roll when it is in service to the later stage The situation is serious. The axis of the support roller is tilted, causing the taper sleeve and the bushing of the oil film bearing to tilt, changing the size and distribution of the gaps on the four throttle sides of the static pressure chamber, which may reduce the bearing capacity of the static and dynamic pressure oil film, and aggravate the difficulty of starting and Problems such as burning oil film bearings

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