Extension coefficient and plate shape integrated control method in steel strip flattening process

A technology of flat elongation and shape control, applied in elongation control, contour control, tension/pressure control, etc., can solve the problem of elongation deviation may not be completely eliminated, the rolling pressure adjustment is too large, the elongation is small, etc. problems, to improve the elongation and shape control accuracy, improve system stability, and achieve the effect of coordinated control

Active Publication Date: 2006-10-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 1. For the system that only adopts the rolling pressure method, for strip steel with thin thickness and high strength grade, since the elongation is not sensitive to the rolling pressure, when the elongation deviation is relatively large, although the rolling pressure adjustment is large, the elongation The rate deviation may not be completely eliminated, thus affecting the elongation rate control accuracy
[0007] 2. In the system that adopts the rolling pressure mode and the tension mode at the same time, the selection method of the control mode is too simple, only considering the strip thickness factor, and cannot fully reflect the sensitivity of the elongation rate to the rolling pressure a

Method used

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  • Extension coefficient and plate shape integrated control method in steel strip flattening process
  • Extension coefficient and plate shape integrated control method in steel strip flattening process
  • Extension coefficient and plate shape integrated control method in steel strip flattening process

Examples

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Effect test

Embodiment 1

[0066] Steel grade DC51, thickness h=1.2mm, width b=1000mm, given elongation ε sv = 0.8%, allowable control deviation of elongation ± 0.2%, the maximum tension T that can be provided by the tension system of the temper mill max =90KN, the maximum rolling pressure P that can be provided by the reduction system of the temper mill max = 4000KN, take the set value of front and rear tension Tsv = 61KN, elongation deviation ε 0 = 0.2% ÷ 3 = 0.067%.

[0067] Input the above parameters into the rolling pressure model of the process computer, the optimal roll bending force model and other related models, and obtain the rolling pressure set value Psv=1710KN, the roll bending force set value Ssv=101KN, and the rolling pressure to Elongation transfer coefficient k pε =61502KN, tension to elongation transfer coefficient k σε =12.8KN / mm 2 , the transfer coefficient of bending force to rolling pressure k sp = 0.07. According to formula (8) (taking α=1.0), the rolling pressure adjustme...

Embodiment 2

[0074] Steel grade DC51, thickness h=0.2mm, width b=1000mm, given value of elongation ε sv = 0.8%, allowable control deviation of elongation ± 0.2%, the maximum tension T that can be provided by the tension system of the temper mill max =90KN, the maximum rolling pressure P that can be provided by the reduction system of the temper mill max = 4000KN, take the set value of front and rear tension Tsv = 21KN, elongation deviation ε 0 = 0.2% ÷ 3 = 0.067%.

[0075] Input the above parameters into the rolling pressure model, optimal roll bending force model and other relevant models of the process computer respectively, and obtain the set value of rolling pressure Psv=2827KN and the set value of roll bending force Ssv=196KN through calculation. Elongation transfer coefficient k pε =87833KN, tension to elongation transfer coefficient k σε =4.4KN / mm 2 , the transfer coefficient of bending force to rolling pressure k sp = 0.12. According to formula (8) (taking α=1.0), the rollin...

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Abstract

The invention discloses a belt steel flattening elongation and slab-shaped complex control method, which is characterized by the following: the invention can choose draught pressure mode by comparing draught pressure adjusting elongation algebraic system and tension adjusting elongation algebraic system or use tension mode to control elongation, which can control rolling process of planisher according to set point of every processing parameter and relevant on-line measured value; the tension is controlled in draught pressure control mode, when the draught pressure accumulation regulating variable is over finite limit and the draught pressure keeps constant; the draught pressure is adjusted in tension control mode, when the tension accumulation regulating variable is over finite limit and the tension keeps constant; the curve roll force is adjusted when adjusting draught pressure.

Description

technical field [0001] The invention relates to a steel production method, in particular to a method for controlling flat elongation and plate shape of strip steel. Background technique [0002] Cold-rolled leveling is to roll the strip steel after recrystallization annealing with a small plastic deformation (elongation is generally 0.2% to 3%) to eliminate the yield platform, control the shape of the plate, and obtain the required surface morphology rolling process. Regardless of the traditional or modern cold rolling process, leveling is one of the essential production links. Since tempering is the last process that determines the shape and mechanical properties of the finished strip, the elongation and shape control of the tempering machine is of great significance for improving the quality of cold-rolled strip. [0003] At present, for most of the hot-dip galvanizing units and the tempering mills in some continuous annealing units, there is no flatness closed-loop cont...

Claims

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Application Information

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IPC IPC(8): B21B37/56B21B37/28B21B37/58B21B37/48B21D1/02
Inventor 顾廷权陈培林李红梅
Owner BAOSHAN IRON & STEEL CO LTD
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