热连轧带钢厚度缺陷溯源研究及应用

doi:10.13228/j.boyuan.issn1006-9356.20230505

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Abstract During the process of strip hot rolling production, finish rolling thickness accuracy is a critical indicator reflecting the product quality. Strip thickness control involves complex models with multivariable, strong coupling, and nonlinearity, it epitomizes precision in Level 2 control for hot strip rolling. Practical production often experiences thickness defects due to diverse, intricate causes. Current analysis heavily relies on manual post-analysis, which is challenging and inefficient due to the complexity involved. In response, an automatic traceability model for thickness defects in hot-rolled strip was developed, which focused on strip products with head thickness defects, identified and analyzed their mechanisms, and traced the primary causes behind these issues. The expertise of experienced numerical modeling experts was integrated. By delving into the model mechanism underpinning strip thickness control and clarifies the coupling relationship between strip thickness and rolling parameters, the study presented an analysis workflow for tracing thickness defects of hot-rolled strip, featuring core analysis modules addressing issues such as inaccuracies in roll gap and rolling force models, as well as anomalies in rolling model parameters. Finally, the strip data of 1 780 mm hot strip mill in a steel plant for three consecutive months were used for model performance test. The results demonstrate a 90.27% accuracy in tracing thickness defects of the strip, effectively meeting actual production requirements. This achievement signifies the successful automation of thickness defect tracing in strip hot rolling, leading to a significant improvement in analysis efficiency.

Key words： hot-rolled strip head thickness thickness control automatic traceability rolling mechanism

Received: 28 August 2023

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	LI Weigang
	SHI Lin
	LIU Weiji

Cite this article:

LI Weigang,SHI Lin,LIU Weiji. Research and application of thickness defect traceability of hot-rolled strip[J]. China Metallurgy, 2024, 34(1): 99-108.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230505 OR http://www.zgyj.ac.cn/EN/Y2024/V34/I1/99

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