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Research on Thickness Control of Cold Rolling Strip

Author: RenShiRong
Tutor: LiuZuoJun
School: Hebei University of Technology
Course: Control Science and Engineering
Keywords: AGC MATLAB / SIMULINK Hydraulic pressure control Tension Control Fuzzy optimal PID controller
CLC: TG335.12
Type: Master's thesis
Year: 2011
Downloads: 59
Quote: 0
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Abstract

Strip thickness precision strip two quality indicators (the other one is a plate -type control) , is a key technology in the field of strip rolling . Strip thickness accuracy is related to the metal savings component weight and strength performance , but also related to the product quality and economic efficiency . This paper is a study on the basis of the MATLAB simulation software is a cold-rolled steel strip thickness control , mainly from the hydraulic pressure and tension control two aspects of exit strip thickness . This paper begins with the theoretical knowledge of the cold-rolled steel strip to start , PH Figure elasticity curves plasticity curve to the two curves intersect . PH diagram can intuitively analyze the factors affecting the exit strip thickness , the no - load roll gap S 0 and plasticity of the slope of the curve can affect the exit strip thickness . Thus deduced to change the hydraulic pressure control and change the slope of the curve of the plasticity of the rolling tension control , no-load roll gap S 0 . In this paper, the automatic thickness control strategy , is ( Automatic Gauge Control AGC) , including feedforward AGC, the feedback the AGC , thickness gauge AGC AGC by tension , flow AGC control mode and many various AGC control mode has its own features. Comprehensive analysis of the advantages and disadvantages of the various AGC selected thickness gauge AGC lag - free analysis of the thickness of the strip output . All factors affecting the strip thickness , hydraulic pressure control is the most direct and the most effective way to change the thickness deviation . Can most significantly reduce the thickness deviation, and is mainly used for rough adjustment. Initially used electric pressure , its response time is long, slow , gradually has obvious advantages of hydraulic pressure to replace . Tension plays a very important role in the rolling process , such as to prevent rolling deviation , so that the rolled band steel plate - type straight, since automatic adjustment effect, but also to increase production , plays the role of energy transfer , mainly as fine tuning strip thickness means . Tension control influencing factors can not be ignored in the strip production process This article tension to the direct control of the strip thickness . Contemporary rapid development of intelligent control technology , intelligent control technology to replace traditional PID control rely on experience , using intelligent control strategy - fuzzy control . The last comparison in the ordinary PID controller and strip thickness optimal fuzzy PID controller to control the situation and draw the appropriate conclusions .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Rolling > Rolling process > Rolling method > Cold-rolled
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