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Control method for improving threading stability of hot-rolled strip steel

A control method and technology for hot-rolled strip, applied in the field of hot-rolled rolling, can solve problems such as TRD steel family is not isolated, tension calculation deviation, etc., to achieve easy realization, improve stability, and solve hot-rolled strip wear. unstable effect

Active Publication Date: 2019-12-13
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the model distinguishes the frame and thickness of the existing variables, each TRD steel group is not isolated, causing each steel group to interact with each other, resulting in tension calculation deviations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] Using a control method for improving the stability of hot-rolled strip threading disclosed in this application, the following processes are used in the threading process:

[0019] a. Before the strip is threaded, the secondary system sends an initial command to control the looper action according to the set height of the looper.

[0020] b. During the strip threading process, when the looper just detects the pressure, the first-level program considers that the looper just touches the strip steel, and calculates the angle deviation of the looper according to the instantaneous angle value of just touching the strip steel. This method requires the first stage to send a digital signal that the looper touches the strip to the second stage. The signal is coded by an existing 8-bit state quantity byte. The first stage program converts this signal into a working variable and sends it to the second stage.

[0021] c. During the belt threading process, the angle deviation of the ...

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PUM

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Abstract

The invention discloses a control method for improving the threading stability of hot-rolled strip steel. The control method comprises the following steps that a first-stage program is adopted by loopmass flow self-learning in the finishing mill threading process to use an angle value at the moment a loop makes contact with the strip steel to calculate the angular deviation of the loop; a targetloop angle unit offset is introduced to loop mass flow self-learning; during loop mass flow self-learning calculation, asymmetric arrangement is adopted by a loop angular deviation dead zone; a threading speed self-learning coefficient is subjected to amplitude limiting setting; and when the tension setting value of the loop is calculated, the tension correction variable of the loop is increased.The control method effectively improves the threading stability of the hot-rolled strip steel, and has good economic and social benefits.

Description

technical field [0001] The invention relates to a control method for improving the threading stability of hot-rolled strip steel, which belongs to the technical field of hot-rolling and rolling. Background technique [0002] In the process of hot rolling production, the strip threading stability has a great influence on the quality of the product, especially when the specification is changed, the steel type is changed, and the first piece of steel is rolled. Strip threading is unstable, which will affect rolling stability, and in severe cases, it will lead to problems such as piled steel, rolling waste, or strip narrowing and thinning. There are many factors affecting the stability of strip threading, among which looper angle, looper tension and strip threading speed are three important factors. [0003] At present, for the angle of the looper and the threading speed, the self-learning program of finishing rolling adopts the correction of the threading speed based on the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/00
CPCB21B37/00
Inventor 丁美良关建辉杨丽琴孙林
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE