Method for preventing strip breakage on startup

Abstract

The invention discloses a method for preventing strip breakage on startup. The method includes, before strip winding, processing sheets with broken strips at first after stopping of a cold rolling mill due to strip breakage, compressing roll gaps of various frames and regulating the minimum rolling force of the roll gaps of the different frames after finishing the strip winding, generating exit tension of the different frames prior to regulating roll bending force of working rolls and intermediate rolls after finishing compressing of the roll gaps, and then, starting the cold rolling mill. The method for preventing strip breakage on startup includes control of the roll gaps of the cold rolling mill, selection of rolling force and tension and generation of tension, regulation of actual inclination and tension deviation of different frames, control of bending conditions of the working rolls and the intermediate rolls after startup, thereby effectively controlling times of startup strip breakage of sheets with the thickness lower than 0.6mm and improving production efficiency.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a method for preventing belt breakage during start-up. Background technique [0002] In the production process of thin materials below 0.6mm in continuous cold rolling, strip breakage is a common accident. The occurrence of a strip breakage accident will directly lead to the shutdown of the production line and a decrease in operating rate. At the same time, the strip steel at the accident site becomes waste, and the product quality at the pickling site is degraded. , When a serious belt breaking accident occurs, it will also cause the roll to stick to steel and pile up steel, which will increase the consumption of the roll. [0003] In the cold-rolled thin material production line, because the operator adjusts the rolling force during the rolling process to make the thickness meet the target requirements, the rolling is too large, resulting in rolling breakage, ...

AI Technical Summary

Problems solved by technology

The strip is pressed against the rolling force, and the machine frame is moved without lifting, resulting in spot leakage and strip breakage

When the previous pass was stopped due to an accident and restarted, the thickness of the steel coil fluctuated greatly in a certain place, and the number of turns was not calculated during the subsequent pass rolling, or the strip was broken due to lifting and pressing, etc.

[0004] When the cold-rolled thin material breaks, if the start-up operation method is improper, it will cause the breakage again, which seriously affects the product quality. Therefore, there is an urgent need for a process control method to solve the problem of starting the thin material.