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CiteSeerX Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The Force Feed Forward (FFF) System is the only hot strip mill AGC system in the world today which does not incorporate the BISRA principle for gage control. Instead, using a revolutionary control algorithm, FFF has proven in five installations in North and South America, that steelmakers need not replace their ...
eccentricity (roll defects, distortions, or irregularities in bearings), mill mechanical vibrations (mill chatter problem), and thermal noises in hot rolling mill, and usually have periodic nature [5], [6]. Internal mode control (IMC) [7], traditional feedforward control [8], and adaptive feedforward
accuracy in thickness control in metal rolling area. If the required accuracy of hot rolling mills can be achieved, then in some cases, cold rolling is not even required, which can result in a radical decrease of production costs. The schematic structure of a typical aluminum hot reversing rolling mill .
on strip thickness control in cold rolling. ... ''fourhigh'' rolling mill, and introduces some of the ... naturally with the eccentricity compensation problem.
After the successful simulation study, the control concepts were implemented on the twostand cold rolling mill. In observation mode the functions for eccentricity and hardness compensation could be monitored and preoptimized in parallel to normal operation with no effect on the current operation of the mill.
Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network Article (PDF Available) in Engineering 06(01):2733 · January 2014 with 591 Reads
Jul 01, 1987· SIMULATION RESULTS In eccentricity control, the following practical considerations apply to production rolling mills and thus should be cons idered in the des ign of relevant simulation studies: • the incoming feed can introduce periodic disturbances in the form of hot rolled thickness disturbances or uncoiler induced tension fluctuations ...
In rolling mill, the accuracy and quality of the strip exit thickness are very important factors. To realize high accuracy in the strip exit thickness, the Automatic Gauge Control (AGC) system is used. Because of roll eccentricity in backup rolls, the exit thickness deviates periodically. In this paper, we design PI controller in outer loop for the strip exit thickness while PD controller is ...
above control systems, a desired elongation is realized by controlling the rolling force of the mill by a hydraulic screwdown control system. AEC for skin pass mill of continuous processing line Conventional AEC methods and their problems In most cases, an inline skin pass mill .
DOI: / Corpus ID: . Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network article{Hameed2014StripTC, title={Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network}, author={Waleed Ishaq Hameed and Khearia A. Mohamad}, journal={Engineering}, .
Mar 27, 2019· The picture above shows the seamless steel pipe perforation site. The eccentricity of many steel pipes is generated at this time, so it is very important to strictly control this perforation. Finished steel pipe Cold drawn steel pipe can also cause eccentricity problems due to perforation:
ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED FORWARD AGC SYSTEM Francis Wagner Manager Rolling Mill Automation Hatch Associates Consultants Inc. Buffalo NY USA ABSTRACT The Force Feed Forward (FFF) System is the only hot strip mill AGC system in the world today which does not incorporate the
The control of rolling is done by a machine, or rolling mill. From a control point of view it is necessary to study the combined behavior of machine and metal deformation to find the variables that may be used to most effectively regulate the process. A typical problem in this area is to control the output thick
Because of the current demands on mills to process much lighter exit gauges from increased incoming hot strip thickness, much larger reductions are necessary on individual mill stands, such high reductions at a nominal width result in a larger area of contact with corresponding higher rolling force, friction and heat generation (see Fig 1
Jan 14, 2017· Hot Rolling is employed for rolling of steel slabs to hot strips in hot strip mills. Like any other hot rolling operations, rolling of hot strip is also a plastic deformation of the material of the slab caused by compressive force applied through a set of rolls. The cross section of the slab is reduced by the hot rolling process.
how to control eccentricity problem in hot rolling mill. An indepth review of the roll eccentricity control design problem is provided which encompasses a nuer of recent, novel, design contributions and includes experimental results from two separate steel, tandem cold rolling mill installations.
The eccentricity disturbance is modeled as white noise w_e driving a bandpass filter Fe. The input thickness disturbance is modeled as white noise w_i driving a lowpass filter Fi. Feedback control is necessary to counter such disturbances. Because the roll gap delta cannot be measured close to the stand, the rolling force f is used for feedback.
An indepth review of the roll eccentricity control design problem is provided which encompasses a number of recent, novel, design contributions and includes experimental results from two separate steel, tandem cold rolling mill installations.
Key Feature of Process Control: Detection of Periodic Defects Rolls and rollers are the most heavily used parts of a rolling mill. Due to wear from contacting hot material with great force, their lifetime is limited. Although rolls are refurbished in the roll shop regularly, they occasionally crack before the end of the usual production cycle.
Rolling Mill Tutorial Part 5. Before continuing, make sure you have read Section : Linear Optimal Filters. Observers. To estimate roll eccentricity, we view the output of the BISRA gauge (which is h + e) as the eccentricity e plus some noise. Before we can use an observer to estimate the roll eccentricity, we need to model it. As before ...
Rolling Mill Tutorial. Before continuing, make sure you have read Chapter 5. System Description. Another control problem (besides the continuous caster) arising in the steel industry is the control of the exit steel thickness in a rolling mill. The diagram below shows the layout of a rolling mill, with thick steel going in one side, and thin ...
The roll eccentricity in a rolling mill may define the limit of achievable thickness tolerances and thus is subject of interest for the automation equipment in hot rolling mills as well as in cold ...
Mar 06, 1990· Unwind/rewind eccentricity control for rolling mills . United States Patent . Abstract: A method of rolling material in a rolling mill in which the material is directed from an unwind coil of the material to the mill and/or to a rewind coil of the material from the mill, the material being under tension as it is directed to and from the ...
A Cold Mill rolls coils of pickled steel from the pickle line at ambient temperature, using coolant oil. The cold mill produces steel and stainless steel and is also used for aluminum, aluminum foil, and copper. There are several types of mills such as 2High, 4High, 6High, 12High, 20High, and Sendzimir Mills that have a variety of types of flatness control operations.
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