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Hardness compensation method for controlling band steel hot-rolling molding process

A technology of hot rolling forming and strip control, applied in the direction of contour control, rolling force/roll gap control, etc., can solve the problem of low rolling precision of the first piece of strip steel, and achieve the effect of improving dimensional precision

Active Publication Date: 2012-07-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of low rolling accuracy of the first piece of strip steel when the steel grade of the existing hot-rolled strip steel is switched, the present invention provides a hardness compensation method for controlling the hot-rolled strip steel forming process

Method used

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  • Hardness compensation method for controlling band steel hot-rolling molding process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] For example: when switching the Q235A steel grade to T610L, the steel T610L M H = 44604 KN

[0073] Upper block steel Q235A M H ’ = 38551 KN, ( M H - M H ’) / M H '=(44604-38551) / 38551 =0.157;

[0074] According to the calculation formula (2), and take from the range of empirical data coff 1=0.7, namely:

[0075] coff MH =1+( M H - M H ’) / M H ' ' coff 1=1+0.157′0.7=1.109

[0076] According to formula (3), the original calculated pressure F = NNFKORR ' M H ' EPS =18327 KN

[0077] According to formula (1), calculate the pressure after adding compensation F = NNFKORR ' M H ' coff MH ' EPS

[0078] = 18327′1.109=20324.64KN

[0079] Embodiment two

Embodiment 2

[0081] For example: Q235AG steel grade is switched to DG47;

[0082] The block steel DG47 M H = 43354 KN;

[0083] Upper block steel Q235AG M H ’ = 50647 KN;

[0084] |( M H - M H ’) / MH| '=(43354-50647) / 50647 =-0.144;

[0085] According to the calculation formula (2), and obtained by experiment coff 1 takes 0.56;

[0086] coff MH =1+( M H - M H ’) / M H ' ' coff 1=1-0.144′0.56=0.919

[0087] According to formula (2), the original calculated pressure F= NNFKORR ' M H ' EPS = 16273 KN

[0088] Calculate the pressure after adding compensation according to formula (1) F = NNFKORR ' M H ' coff MH ' EPS

[0089] = 16273′0.919=14954.89KN.

[0090] Embodiment three

Embodiment 3

[0092] For example: Q235A steel grade is switched to SUS304;

[0093] The block steel SUS304 M H = 71757KN;

[0094] Upper block steel Q235A M H ’ = 45187 KN;

[0095] |( M H - M H ’) / MH| '=(71757-45187) / 45187 =0.588;

[0096] According to the calculation formula (2), and obtained by experiment coff 1 takes 0.3;

[0097] coff MH =1+( M H - M H ’) / M H ' ' coff 1=1+0.588′0.3=1.174;

[0098] According to formula (3), the original calculated pressure F = NNFKORR ' M H ' EPS = 25944 KN

[0099] According to formula (1), calculate the pressure after adding compensation F = NNFKORR ' M H ' coff MH ' EPS

[0100] = 25944 ′1. 176=30510.14KN.

[0101] Embodiment four

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Abstract

The invention relates to a hardness compensation method for controlling the band steel hot-rolling molding process, including the band steel hot-rolling molding process in which band steel is rolled into a predetermined width and thickness via a plurality of rough rolling and fine rolling procedures under the control of a computer program, particularly during the switchover of band steel rough rolling and fine rolling, the hardness compensation formula in the model-controlled band steel hot-rolling molding process is F=NNFKORR'MH'coffMH'EPS, where, F is the rolling pressure, NNFKORR is a pressure self-learning coefficient, MH is a band steel calculation hardness, EPS is a percentage of reduction, and coffMH is a hardness coefficient. In the invention, the band steel hot-rolling molding pressure is controlled precisely and timely, defects of over-pressure and under-pressure in the present band steel hot-rolling process are overcome, the quality of hot-rolled band steel products is greatly improved.

Description

technical field [0001] The invention relates to a rolling method of hot strip steel, in particular to a hardness compensation method of hot strip steel forming process controlled by a computer program. Background technique [0002] In the steel grade switching process of hot strip steel, there are generally standard requirements on the process, and the steel grades are distinguished according to their hardness, while the steel grade switching follows the principle of similar hardness for transition. There are two model setting methods when the steel grade is switched. When the hardness of the steel grade is relatively close, within 10%, the short-term genetic method is used for setting calculation, that is, the pressure calculation adopts the self-learning pressure correction coefficient of the previous block of steel; when the steel grade The difference in hardness is large, and when it exceeds 10%, the long-term genetic method is used for model setting, and the long-term g...

Claims

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Application Information

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IPC IPC(8): B21B37/28B21B37/58
Inventor 田建艳邱华东王芳
Owner TAIYUAN UNIV OF TECH
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