Abstract

Controlling the profile and edge drop in the cold rolling process is crucial especially in applications involving silicon steel. In non-oriented silicon steel production, the work rolls shifting control is widely applied in 6-high tandem cold mills and the differences of the control characters of different stands have been gradually recognized. However, because of the lack of research on shifting control effect of separate stands and their influence between each other, controlling the edge drop by cooperatively shifting the work rolls of multiple stands is still impossible, so the mills’ capability is not utilized efficiently. In this study, we develop a finite element method (FEM) model to investigate this issue. Based on the results of the FEM model, we conclude that work roll shifting of different stands leads to the independent control of edge drop, obtain the shifting control effect of different stands to their exit, and the attenuation effects by the following stands. Besides, we deduce that the approach to calculating the edge drop control characteristics should be modified to summation equation of the attenuation effects. The results of an experiment involving 6-high tandem cold mills are in agreement with the results of calculation with the FEM model and we demonstrate the high precision of the FEM model and the reliability of the subsequent analysis. Based on the edge drop control characters established, the control model and the cooperation strategy were designed and applied to the practical production, and significant improvements of edge drop and transverse thickness deviation were obtained.

中文翻译：

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基于有限元方法模型的工作辊移位控制对六连轧冷轧机边落的影响

摘要

在冷轧过程中控制轮廓和边缘下降至关重要，尤其是在涉及硅钢的应用中。在无取向硅钢生产中，工作辊移位控制已广泛应用于六辊串联冷轧机中，并且逐渐认识到不同机架的控制特性的差异。但是，由于缺乏对单独的机架的移位控制效果及其相互之间的影响的研究，因此通过协同移位多个机架的工作辊来控制边缘下降仍然是不可能的，因此不能有效地利用轧机的能力。在这项研究中，我们开发了一个有限元方法（FEM）模型来研究此问题。根据FEM模型的结果，我们得出结论，不同机架的工作辊移位导致边缘下降的独立控制，获得不同机架对其出口的移位控制效果，以及以下机架的衰减效果。此外，我们推论应将计算边缘下降控制特性的方法修改为衰减效应的求和方程。涉及6座串联冷轧机的实验结果与FEM模型的计算结果相符，并且我们证明了FEM模型的高精度和后续分析的可靠性。根据建立的边降控制特性，设计了控制模型和合作策略，并将其应用于实际生产中，