A Control Method for Improving Rolling Force and Thickness Accuracy of Finished Strip Steel by Tension Compensation
A control method and thickness accuracy technology, applied in the direction of rolling force/roll gap control, tail end control, etc., can solve problems such as discrepancies
Active Publication Date: 2017-02-08
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
[0006] The purpose of the present invention is to provide a control method for improving the rolling force and thickness accuracy of the finished strip steel through tension compensation, the method distinguishes three different tension states in the rolling process of the strip head to calculate the rolling force, Solve the problem that the actual tension does not match the set tension state during the rolling force calculation process, and improve the rolling force setting accuracy and head thickness accuracy of the finished strip steel rolling
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[0050] see image 3 , a control method for improving the rolling force and thickness accuracy of finished strip steel through tension compensation, comprising the following steps:
[0051] Step 1. Calculating the deformation resistance and rolling force of the finish-rolled strip under high tension state during the looper unwinding process;
[0052] In order to consider the influence of different tension states on the rolling force calculation during the rolling process, this patent proposes the following deformation resistance model considering tension compensation:
[0053]
[0054]Where: km 1 is the deformation resistance of the rolled piece under high tension state, σ 0 is the impact term of the chemical composition of the rolled piece, is the influence item of the effective deformation degree, is the influence term of the effective deformation rate, k T (T) is the influence item of deformation temperature; T F 、a F , —respectively forward tension, the influe...
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The invention provides a comprehensive control method for improving rolling force of precisely rolled strip steel and thickness precision through tension compensation. The method comprises the following steps of distinguishing three tension states comprising a micro-tension state, a large tension state and a normal tension state in a rolling process of the head of the precisely rolled strip steel; respectively calculating deformation resistance under the three tension states; setting the rolling force of the strip steel by using the rolling force in the large tension state; setting a roll gap of the head of the strip steel by using the rolling force in the micro-tension state; and performing adaptive learning by using the rolling force in the normal tension state. The problem that rolling force setting calculation, roll gap setting calculation and rolling force adaptive learning are conflicting is solved; and the setting precision of a hot rolled strip steel rolling force model and a roll gap model is improved, so that the setting precision of the precisely rolled rolling force and the controlling precision of the thickness of the head of the strip steel are simultaneously improved.
Description
technical field [0001] The present invention relates to the technical field of process control of metallurgical hot-rolled strip steel. Specifically, the present invention relates to a method for setting the rolling force of the finish-rolled strip steel. The thickness control of the head avoids the shortcomings of the previous strip steel setting method, and improves the precision of setting rolling force and thickness control of finishing rolling. Background technique [0002] The rolling force model is the most critical model for hot rolling and finishing rolling process control. The prediction accuracy of this model directly affects the rolling stability of the strip, the control accuracy of the thickness of the strip head, and the setting accuracy of the shape model. [0003] The current hot rolling model setting technology mainly improves the accuracy of strip thickness control by improving the prediction accuracy of the rolling force model and the roll gap model. Cha...
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IPC IPC(8): B21B37/58B21B37/72
Inventor 张健民李维刚
Owner BAOSHAN IRON & STEEL CO LTD