Multi-mode control of strip-finishing-temperature in hot-strip mills

WANG Hai-yu; GUO Li-wei; YANG Quan; WANG Xiao-chen; WANG Shu-zhi; DONG Li-jie

doi:10.13374/j.issn2095-9389.2019.07.013

Volume 41 Issue 7

Jul. 2019

Turn off MathJax

Article Contents

Article Navigation > Chinese Journal of Engineering > 2019 > 41(7): 940-946

WANG Hai-yu, GUO Li-wei, YANG Quan, WANG Xiao-chen, WANG Shu-zhi, DONG Li-jie. Multi-mode control of strip-finishing-temperature in hot-strip mills[J]. Chinese Journal of Engineering, 2019, 41(7): 940-946. doi: 10.13374/j.issn2095-9389.2019.07.013

Citation:

WANG Hai-yu, GUO Li-wei, YANG Quan, WANG Xiao-chen, WANG Shu-zhi, DONG Li-jie. Multi-mode control of strip-finishing-temperature in hot-strip mills[J]. Chinese Journal of Engineering, 2019, 41(7): 940-946. doi: 10.13374/j.issn2095-9389.2019.07.013

Citation:

PDF( 2343 KB)

Multi-mode control of strip-finishing-temperature in hot-strip mills

doi: 10.13374/j.issn2095-9389.2019.07.013

1.
Automation Research Institute, Beijing Shougang Automation Information Technology Co., Ltd., Beijing 100041, China
2.
National Engineering Research Centerof Flat Rolling Equipment, University of Science and Technology Beijing, Beijing 100083, China
3.
Beijing Shougang Co., Ltd, Qianan 064400, China

More Information

Corresponding author: WANG Hai-yu, E-mail: wanghaiyu813@163.com
Received Date: 2018-05-23
Publish Date: 2019-07-01

Abstract

Abstract

At present, hot-rolled strip manufacturing has gradually exhibited more diversity and process complexity. Using the single control strategy, the traditional strip-finishing temperature-control mode shows some defects and deficiencies, for example, low control precision, slow production rhythm, and great fluctuation in the strip-finishing-temperature curve, which cannot meet the requirements for high precision and high-performance product control. For use with domestic 2250 mm hot-strip mills, a multi-mode control model was developed on a quadratic programming algorithm for the strip-finishing temperature. The proposed multi-mode control model has three control modes to regulate the speed, inter-stand cooling, and coupled speed and inter-stand cooling. To obtain the best control effect, the appropriate control mode can be adopted depending on the different steels used and different working conditions in the hot-rolling process. At the same time, based on the cooling capacity of the adjustable rack and the calculated strip-finishing temperature, Newton-Raphson iteration and the acceleration calculation model were used to calculate the large acceleration region and the quadratic programming optimization method to optimize the on-line adjustment of different control modes to meet all the strip-finishing temperature-control requirements. The on-line application of the proposed multi-model realized a 99% hit rate or better on the strip-finishing temperature for three consecutive months, with a deviation in the strip-finishing-temperature control of ±20℃. A 97.2% hit rate or better was realized on the strip-finishing temperature for three consecutive months with a deviation in the strip-finishing-temperature control of ±15℃. These results show that the control model has the advantages of a fast response speed and high precision and meets the requirements of finishing-temperature control for different steels and different working conditions. As such, the proposed method improves the strip-rolling stability and the accuracy of the finishing-temperature control and enhances product competitiveness.
- strip,
- hot-strip mills,
- finishing temperature,
- multi-model,
- quadratic programming method,
- acceleration

FullText(HTML)

References(15)

References

[1]	高世卿. 熱連軋帶鋼終軋溫度預報模型的研究[學位論文]. 北京: 北京科技大學, 2010 Gao S Q. Research on Model for Strip Temperature Prediction of Finishing Rolling in Hot Strip Steel Mill[Dissertation]. Beijing: University of Science and Technology Beijing, 2010
[2]	孫一康. 冷熱軋板帶軋機的模型與控制. 北京: 冶金工業出版社, 2010 Sun Y K. Model and Control of Cold and Hot Rolled Strip Mill. Beijing: Metallurgical Industry Press, 2010
[3]	宋勇, 唐荻, 趙志毅, 等. 熱連軋精軋機組溫度模型的改進. 北京科技大學學報, 2002, 24(5): 547 doi: 10.3321/j.issn:1001-053X.2002.05.017 Song Y, Tang D, Zhao Z Y, et al. Improvement of the temperature model for a finishing mill group in hot rolling. J Univ Sci Technol Beijing, 2002, 24(5): 547 doi: 10.3321/j.issn:1001-053X.2002.05.017
[4]	宋勇, 荊豐偉, 殷實, 等. 厚規格熱軋帶鋼高精度卷取溫度控制模型. 工程科學學報, 2015, 37(1): 106 https://www.cnki.com.cn/Article/CJFDTOTAL-BJKD201501016.htm Song Y, Jing F W, Yin S, et al. High-precision coiling temperature control model for heavy gauge strip steel. Chin J Eng, 2015, 37(1): 106 https://www.cnki.com.cn/Article/CJFDTOTAL-BJKD201501016.htm
[5]	傅新, 陳水宣, 鄒俊, 等. 熱軋帶鋼精軋過程的混合溫度模型. 浙江大學學報(工學版), 2008, 42(2): 219 doi: 10.3785/j.issn.1008-973X.2008.02.006 Fu X, Chen S X, Zou J, et al. Hybrid temperature model for hot strip in finishing stands. J Zhejiang Univ Eng Sci, 2008, 42(2): 219 doi: 10.3785/j.issn.1008-973X.2008.02.006
[6]	張博, 郭強, 張飛, 等. 精軋溫度模型優化算法與控制策略的研究. 控制工程, 2014, 21(3): 352 doi: 10.3969/j.issn.1671-7848.2014.03.010 Zhang B, Guo Q, Zhang F, et al. Temperature optimization and control strategy of hot rolled in finishing. Control Eng China, 2014, 21(3): 352 doi: 10.3969/j.issn.1671-7848.2014.03.010
[7]	Serajzadeh S. Prediction of temperature variations and kinetics of austenite phase change on the run-out table. Mater Sci Eng A, 2006, 421(1-2): 260 doi: 10.1016/j.msea.2006.01.071
[8]	Fischer F D, Schreiner W E, Werner E A, et al. The temperature and stress fields developing in rolls during hot rolling. J Mater Process Technol, 2004, 150(3): 263 doi: 10.1016/j.jmatprotec.2004.02.059
[9]	Stepashin A M, Kondrat'ev A A, Shleining L I. Effect of the finishing temperature in rolling operations on the striation of strip for side members. Metallurgist, 2003, 47(1-2): 88 http://search.ebscohost.com/login.aspx?direct=true&db=aph&AN=16980944&site=ehost-live
[10]	王淑君, 徐建忠. 加速度對熱帶終軋溫度的影響. 熱加工工藝, 2012, 41(7): 81 doi: 10.3969/j.issn.1001-3814.2012.07.027 Wang S J, Xu J Z. Effects of acceleration rate on finishing temperature of hot rolling strip. Hot Work Technol, 2012, 41(7): 81 doi: 10.3969/j.issn.1001-3814.2012.07.027
[11]	龔殿堯, 徐建忠, 劉相華, 等. 熱連軋帶鋼終軋溫度控制控制樣本跟蹤策略. 東北大學學報(自然科學版), 2006, 27(8): 883 doi: 10.3321/j.issn:1005-3026.2006.08.015 Gong D Y, Xu J Z, Liu X H, et al. Piecewise micro tracking control of finishing temperature during continuous strip hot rolling. J Northeast Univ Nat Sci, 2006, 27(8): 883 doi: 10.3321/j.issn:1005-3026.2006.08.015
[12]	時連興, 王淑志, 徐偉, 等. 熱軋帶鋼終軋溫度控制與優化. 軋鋼, 2013, 30(4): 61 doi: 10.3969/j.issn.1003-9996.2013.04.017 Shi L X, Wang S Z, Xu W, et al. Control and optimization of strip finishing rolling temperature. Steel Roll, 2013, 30(4): 61 doi: 10.3969/j.issn.1003-9996.2013.04.017
[13]	王海玉, 高雷, 趙強, 等. 熱軋帶鋼終軋溫度控制模型的研究與應用. 控制工程, 2018, 25(4): 677 https://www.cnki.com.cn/Article/CJFDTOTAL-JZDF201804022.htm Wang H Y, Gao L, Zhao Q, et al. Study and application of strip finishing temperature control model in hot strip mills. Control Eng China, 2018, 25(4): 677 https://www.cnki.com.cn/Article/CJFDTOTAL-JZDF201804022.htm
[14]	盧戰杰, 魏紫鑾. 邊界約束二次規劃問題的分解方法. 計算數學, 1999, 21(4): 475 doi: 10.3321/j.issn:0254-7791.1999.04.009 Lu Z J, Wei Z L. Decomposition method for quadratic programming problem with box constraints. Math Numer Sin, 1999, 21(4): 475 doi: 10.3321/j.issn:0254-7791.1999.04.009
[15]	謝政, 李建平, 陳摯. 非線性最優化理論與方法. 北京: 高等教育出版社, 2010 Xie Z, Li J P, Chen Z. Theory and Methods of Nonlinear Optimization. Beijing: Higher Education Press, 2010