Coil width control method and apparatus

Patent metadata

Field	Value
Publication number	US-2019201954-A1
Application number	US-201815914841-A
Country	US
Kind code	A1
Filing date	Mar 7, 2018
Priority date	Dec 28, 2017
Publication date	Jul 4, 2019
Grant date	—

Abstract

Disclosed is a coil width control method including: a step in which a control unit generates a prediction model for predicting the width shrinkage of a coil, which occurs in the heat-treatment process and post-treatment process of a cold-rolled steel sheet production process, on the basis of historical operating results; a step in which the control unit receives the input width of the coil entering the heat-treatment process; and a step in which the control unit predicts the output width of the coil after the post-treatment process on the basis of the received input width and the conditions of the cold-rolled steel sheet production process, and controls in-furnace temperature and in-furnace tension of the heat-treatment process and elongation of the post-treatment process.

First claim

1 . A coil width control method comprising:
a step in which a control unit generates a prediction model for predicting a width shrinkage of a coil, which occurs in a heat-treatment process and post-treatment process of a cold-rolled steel sheet production process, on the basis of historical operating results; a step in which the control unit receives an input width of the coil entering the heat-treatment process; and a step in which the control unit predicts an output width of the coil, after the post-treatment process, on the basis of the received input width and conditions of the cold-rolled steel sheet production process, and as a function of the predicted output width controls in-furnace temperature and in-furnace tension of the heat-treatment process and elongation of the post-treatment process.

2 . The coil width control method of claim 1 , wherein the prediction model is a correlation model between operating conditions and coil width shrinkage, generated by performing regression analysis of the operating conditions through a least square method, wherein the operating conditions include the in-furnace temperature, the in-furnace tension and the elongation.

3 . The coil width control method of claim 2 , wherein the step in which the control unit controls in-furnace temperature and in-furnace tension of the heat-treatment process and elongation of the post-treatment process comprises:
a step in which the control unit firstly predicts the output width of a corresponding coil on the basis of the received input width and the conditions of the cold-rolled steel sheet production process by use of a historical database (DB) and controls the in-furnace temperature on the basis of the firstly predicted output width and the prediction model, before the corresponding coil enters the heat-treatment process; a step in which the control unit secondly predicts the output width of the corresponding coil on the basis of current heat-treatment process conditions and controls the in-furnace tension on the basis of the secondly predicted output width and the prediction model, after the corresponding coil enters the heat-treatment process; and a step in which the control unit thirdly predicts the output width of the corresponding coil on the basis of current post-treatment process conditions and controls the elongation on the basis of the thirdly predicted output width and the prediction model, after the corresponding coil passes through the heat-treatment process.

4 . The coil width control method of claim 3 , wherein, in the step in which the control unit controls the elongation, the control unit controls the elongation by sequentially controlling a roll force of a skin pass mill and a roll force of a tension leveler.

5 . The coil width control method of claim 1 , further comprising:
a step in which the control unit receives an actual output width of the coil that passed through the post-treatment process; and a step in which the control unit updates the prediction model on the basis of a deviation between the predicted output width and the received actual output width.

6 . A coil width control apparatus comprising:
an input width measurement unit configured to measure an input width of a coil entering a heat-treatment process in a cold-rolled steel sheet production process, the cold rolled sheet production process including the heat-treatment process and a post-treatment process; a heat-treatment control unit configured to control in-furnace temperature and in-furnace tension of the heat-treatment process; a post-treatment control unit configured to control elongation of the post-treatment process; and a control unit configured to generate a prediction model for predicting a width shrinkage of the coil, which occurs in the heat-treatment process and the post-treatment process, on the basis of historical operating results, the control unit predicting an output width of the coil after the post-treatment process on the basis of the input width received from the input width measurement unit and conditions of the cold-rolled steel sheet production process, and controlling the in-furnace temperature and the in-furnace tension through the heat-treatment control unit on the basis of the predicted output width and the prediction model, and controlling the elongation through the post-treatment control unit.

7 . The coil width control apparatus of claim 6 , wherein the control unit is configured to:
firstly predict the output width of the corresponding coil on the basis of the received input width and the conditions of the cold-rolled steel sheet production process by use of a historical database (DB) and predict the in-furnace temperature through the heat-treatment control unit on the basis of the firstly predicted output width and the prediction model, before the corresponding coil enters the heat-treatment process; secondly predict the output width of the corresponding coil on the basis of current heat-treatment process conditions and control the in-furnace tension through the heat-treatment control unit on the basis of the secondly predicted output width and the prediction model, after the corresponding coil enters the heat-treatment process; and thirdly predict the output width of the corresponding coil on the basis of current post-treatment process conditions and control the elongation through the post-treatment control unit on the basis of the thirdly predicted output width and the prediction model, after the corresponding coil passes through the heat-treatment process.

8 . The coil width control apparatus of claim 6 , further comprising an output width measurement unit configured to measure the output width of the coil that passed through the post-treatment process,
wherein the control unit is configured to receive the actual output width of the coil, which passed through the post-treatment process, from the output width measurement unit, and update the prediction model on the basis of a deviation between the predicted output width and the received actual output width.

Assignees

• Hyundai Steel Co

Inventors

• Kim Dong Iel
• Kim Sang Ju
• Kim Hyeong Jin
• Seon Jeong An
• Jeong Ji Wung

Classifications

• C21D9/56

  Continuous furnaces for strip or wire · CPC title

• B21B37/56

  Elongation control · CPC title

• C21D11/00

  Process control or regulation for heat treatments · CPC title

• C21D1/26 Primary

  Methods of annealing · CPC title

• C21D9/564

  Tension control · CPC title