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Method for automatic controlling thickness in fast high precision plate strip rolling process

A high-precision, plate-and-strip technology, applied in rolling mill control devices, metal rolling, metal rolling, etc., can solve problems such as the influence of speed changes on control quality

Inactive Publication Date: 2008-02-20
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be known from formula (1) that the change of rolling speed will change the lag time τ of the system. Although the speed compensation is considered in the integrator, the speed change will still have a considerable impact on the control quality

Method used

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  • Method for automatic controlling thickness in fast high precision plate strip rolling process
  • Method for automatic controlling thickness in fast high precision plate strip rolling process
  • Method for automatic controlling thickness in fast high precision plate strip rolling process

Examples

Experimental program
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Effect test

example 1

[0094] A single-stand four-high reversible experimental rolling mill is used, and the relevant parameters of the system are as follows:

[0095] Rolled steel grade: ST12

[0096] Incoming material thickness width 250mm, 0.50mm, outlet thickness 0.40mm, rolling speed 2.5m / s

[0097] Rolling mill stiffness M = 550kN / mm, strip plastic coefficient Q = 450 kN / mm

[0098] The thickness gauge is a VOLLMER contact thickness gauge, and the distance between the thickness gauge and the roll center line of the rolling mill is L g =765mm

[0099] The monitoring AGC control parameters and methods based on the above conditions are as follows:

[0100] 1) Input the relevant data of the four-high reversible rolling mill and strip steel into the computer, the stiffness coefficient of the rolling mill M = 550kN / mm, the plasticity coefficient of the strip steel Q = 450kN / mm, the distance L between the thickness gauge and the roll center line of the rolling mill g =765mm;

[0101] 2) Determin...

example 2

[0117] The four-high reversing rolling mill of the cold strip mill is adopted, and the relevant parameters of the system are as follows:

[0118] Rolled steel grade: 65Mn

[0119] Incoming material width 130mm, thickness 1.0mm, exit thickness 0.80mm, rolling speed 3.0m / s

[0120] The parameters of the four-high reversible rolling mill are as follows: rigidity M = 400kN / mm, plasticity coefficient Q of the strip steel = 500kN / mm

[0121] The thickness gauge is a domestic contact type thickness gauge, and the distance between the thickness gauge and the center line of the rolling mill roll is L g =500mm

[0122] The monitoring AGC control parameters and methods based on the above conditions are as follows:

[0123] 1) Input the relevant data of the four-high reversible rolling mill and strip steel into the computer, the stiffness coefficient of the rolling mill M = 400kN / mm, the plasticity coefficient of the strip steel Q = 500kN / mm, the distance L between the thickness gauge ...

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Abstract

The fast high precision plate and strip rolling AGC monitoring process includes the following steps: 1. inputting rolling system and steel strip data, including rolling machine rigidity coeffiecient M, steel strip plasticity coefficient Q and the distance Lg between the thickness measuring instrument and the roller axis; 2. determining the proportion coefficient K=M / M+Q of the thickness controlling target; 3. setting sample tracking length Ls=Ls / n; 4. taking the eliminating rate a of the integration regulator; 5. acquiring the measured thickness values and average thickness difference in the time i with the thickness measuring instrument and computer; and 6. calculating the addition value of the roll gap and the control rate at time i based on the recursive formula of the present invention. The present invention has high response speed, and high static control precision superior to 1 %.

Description

technical field [0001] The invention belongs to the technical field of steel rolling automatic control, in particular to a method for monitoring AGC of fast and high-precision strip rolling. Background technique [0002] In the strip rolling process, one of the most commonly used thickness control methods is to measure the actual thickness of the strip through the rack outlet thickness gauge, and then adjust the hydraulic roll gap of the rolling mill to perform feedback control on the thickness of the strip . Usually this thickness control method is called monitoring AGC (Automatic Gage Control). Due to the limitation of the structure of the rolling mill, the maintenance of the thickness gauge, and in order to prevent the strip from being damaged by the broken strip, the thickness gauge is generally installed far away from the roll gap that directly produces the thickness change, for example, the exit of the hot continuous rolling mill The thickness gauge is installed betw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/16
Inventor 张殿华刘相华孙涛吴志强王国栋
Owner NORTHEASTERN UNIV LIAONING
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