Method for comprehensive control of elongation coefficient and plate shape of steel band during even rolling process

A technology of skin-pass rolling and control method, which is applied in the direction of elongation control, rolling mill control device, metal rolling, etc., can solve the problem of inability to take into account the comprehensive control of strip elongation and flat shape, etc.

Inactive Publication Date: 2007-07-25
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that in the traditional cold rolling process, the control of elongation and shape of the strip steel in the flattening process depends on operator experience and m...

Method used

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  • Method for comprehensive control of elongation coefficient and plate shape of steel band during even rolling process
  • Method for comprehensive control of elongation coefficient and plate shape of steel band during even rolling process
  • Method for comprehensive control of elongation coefficient and plate shape of steel band during even rolling process

Examples

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Effect test

no. 1 example

[0143] According to the rolling theory, it can be known that in the process of leveling, if the diameter of the roll is known, and the specifications, steel types and friction conditions of the leveled strip are also determined, the elongation of the strip is the total rolling pressure P 0 , front and rear tension T 1 , T 0 The function of is simply shown in formula (15):

[0144] ε=f 1 (P 0 ,T 1 ,T 0 ) (15)

[0145] From the above formula, as long as the total rolling pressure P 0 , front and rear tension T 1 , T 0 When it is determined, the elongation of the strip is also determined. Obviously, for the same elongation ε, the total rolling pressure P 0 , front and rear tension T 1 , T 0 etc. In theory, there are countless combinations that can meet the requirements, and its value is not unique. In fact, the purpose of flattening is not only to ensure that the finished product meets the mechanical performance index, but also the shape of the plate must be taken in...

no. 2 example

[0160] According to the metal deformation model in rolling theory, the front and rear tension σ of the strip during temper rolling 1i , σ 0i It can be represented by formula (18) and formula (19) respectively:

[0161] σ 1 i = T 1 + E 1 - v 2 [ h i h ( 1 - ϵ ) - H i h ] - - - ( 18 )

[0162] σ 0 i = ...

no. 3 example

[0184] In the actual leveling production, both mechanical properties and appearance quality indicators should be taken into account, and the importance of these factors to user needs can also vary. For this reason, the present invention combines the mechanical performance and appearance quality of strip steel into a unified target for control, and introduces the comprehensive control of strip shape and mechanical performance.

[0185] Control the objective function, as shown in formula (24):

[0186] F ( X ) = α · g 1 ( X ) - 1 ( ...

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Abstract

A method for controlling the elongation percentage, plate shape, etc in the skin rolling procedure of band steel features that an elongation percentage control unit, a plate shape control unit and an integrated control unit for both elongation percentage and plate shape are used, which use respectively three different optimizing algorithms to be used in a single iterative calculation procedure consisting of multiple optimizing calculation sub-procedures.

Description

technical field [0001] The invention relates to a cold rolling process in the iron and steel smelting process, in particular to the elongation rate, shape and comprehensive control method of strip steel in the temper rolling process. Background technique [0002] Figure 1 is a schematic diagram of a cold temper rolling process. As shown in Figure 1, the steel strip 1 is rolled out from the uncoiler 2 and sent to the tempering machine 3. After tempering and rolling, the strip steel 1 meets the specified process requirements and is sent to the coiler 4 for rewinding. The steel strip 1 is leveled, and the rolls of the skin leveling machine include backup rolls 5 and work rolls 6 , wherein the work rolls are in direct contact with the surface of the steel strip 1 . [0003] In the rolling process, there are usually two main indicators to measure the performance of the strip steel after passing through the tempering machine. One is the elongation of the strip steel, which is the...

Claims

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Application Information

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IPC IPC(8): B21B37/56B21B37/28B21B37/00
Inventor 张宝平丁勇生白振华
Owner BAOSHAN IRON & STEEL CO LTD
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