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Method for preventing strip breakage on startup

A strip breaking and threading technology, applied in the direction of rolling force/roll gap control, tension/pressure control, etc., can solve the problems of large fluctuations in the thickness of steel coils, affecting product quality, and uncalculated coils, etc., to prevent start-up The number of car broken belts, the effect of improving efficiency and reducing the rate of broken belts

Active Publication Date: 2014-05-14
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] A kind of method that the present invention provides to prevent cold-rolled thin material from being produced by acid-rolling unit starts and breaks the method, after the cold-rolling unit breaks and stops, comprises the following steps:

[0025] Step A1: First process the broken belt and thin material, and then thread the belt. This step specifically includes:

[0026] Step A11: When threading the strip, push the strip steel onto the strip threading mandrel of the carrousel coiler by manually pressing the strip forward button to complete the strip threading work. By manually operating the coiler to coil the strip, not only the carrousel coiler can coil the strip, but also establish the tension between the racks to prepare for the start-up, and can also control the coiling of the strip at a low speed. Slowly adjust the strip steel to the center position to prevent the deviation of the tension on both sides (operating side and driving side) due to the strip steel not bei...

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PUM

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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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/58B21B37/48
Inventor 曾卫仔蔡阿云李振乔建军闻达左智宏陈甚超张生
Owner SHOUGANG CORPORATION
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