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Research Papers

Coupling Dynamic Model and Control of Chatter in Cold Rolling

[+] Author and Article Information
Xu Yang1

Key Laboratory of Advanced Control of Iron and Steel Process (Ministry of Education), School of Automation and Electrical Engineering,  University of Science and Technology, Beijing, Chinaustb.yangxu@gmail.com

Chao-nan Tong

Key Laboratory of Advanced Control of Iron and Steel Process (Ministry of Education), School of Automation and Electrical Engineering,  University of Science and Technology, Beijing, Chinatcn@ies.ustb.edu.cn

1

Corresponding author.

J. Dyn. Sys., Meas., Control 134(4), 041001 (Apr 24, 2012) (8 pages) doi:10.1115/1.4005498 History: Received July 11, 2010; Revised December 12, 2011; Published April 23, 2012; Online April 24, 2012

The dynamic model of 4-h mill, which couples with the rolling process model, the mill roll stand structure model, and the hydraulic servo system model, is built by analyzing the vibration process of cold rolling. By linearization, the multiple input multiple output linear transfer function matrix model of single stand 4-h cold mill system is obtained. With the consideration of strip quality, the model of strip thickness control system is established in a simplified form. Meanwhile, the robust controller based on quantitative feedback theory is designed for the gauge control model. A comparison with PID controller shows that the controller has better disturbance attenuation performance for parameter uncertainty and external disturbance.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Geometry of the roll gap in rolling process

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Figure 2

Slab analysis on a volume element in the roll gap

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Figure 3

Schematic diagram of a double-acting hydraulic ram with a three-land-four-way spool valve

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Figure 4

The structure model of single stand

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Figure 5

Block diagram of the single stand chatter model

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Figure 6

Closed-loop gauge control system model

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Figure 7

Step response of roll gap variation with rolling speed 15 m/s

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Figure 8

Step response of roll gap variation with rolling speed 22 m/s

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Figure 9

Block diagram of the QFT control system

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Figure 10

Step response of gauge control system under ideal status

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Figure 11

Step response of gauge control system under different friction coefficient

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Figure 12

Step response of gauge control system under sudden decrease of back tension

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