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This simplifies routine tests and maintenance work significantly the control and visual inspection of the valve functions can be performed by one person alone. grip engineering develops cooling systems for your rolling mills. grip is the right choice for new plants and for the modernization of existing rolling mills.
A hybrid AGC for a single-stand rolling mill provides an example of acting on the data that has been collected and analyzed in the sensing and thinking steps (see Fig. 4). The previous control system used the roll gap to control strip thickness and tension reel current to control strip tension. Unfortunately, the system had a
Keywords: rolling mill, multi-stand mill, thickness con-trol, tension control, flying gauge change, non-linear control, flatness based control. Abstract A multi-stand rolling mill is a highly complex coupled non-linear system. If the operating point is changing in a wider range the non-linearities can no longer be neglected in the controller ...
Hydraulic automatic gauge control (AGC) is a very important part of rolling mill for magnesium plate rolling. The control effect of automatic gauge control system influences the quality of the ...
Control, automation and the hot rolling of steel By P. J. Reeve, A. F. MacAlister and T. S. Bilkhu ALSTOM Drives & Controls Ltd], Boughton Road, Rugby CV21 1BU, UK The current state of automation and control for hot rolling mills, with a particular emphasis on flat products, is introduced. A typical modern control-system design
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 …
Considers some of the distributed aspects of the control of modern metal rolling mills. Such mills have a range of ever more ambitious targets, for example product quality, yield, metallurgy and throughput. These aims are supported by high levels of mill sophistication, in terms of plant equipment, instrumentation, actuators and control hardware. In spite of this …
Thickness feedback control The basic control strategy is thickness feedback (monitor control) based on the measured thickness deviation at the exit side of the mill. The delay time, transport of the strip from the roll gap to the thickness gauge, essentially determines the control system's dynamic response, particular at low rolling speed.
Precision control of length of cut of rolling stock by cropping shear after roughing mill results in reduction in waste and increase in mill yield. In addition to the higher rate of production in a given time, different grades of steel can be rolled because each grade has its own mill setup coming from the automation system, increased plant ...
The estimated mechanical centre crown control effect of each rolled strip width with an outboard back-up roll bending (BURB) device for hot steel rolling in a plate mill (work roll diameter is 1,020 mm, back-up roll diameter 1,830 mm, and barrel length is 4,700 mm) is …
This paper considers some of the control issues in hot rolling mills. Hence to set the context, first we give a brief description of a typical process. The role of a hot strip mill process is to roll the slabs produced in a continuous casting process and produce strips of thickness 0.8–20 mm. Fig. 1 shows a typical layout of a hot strip mill.
In the process of Rolling the most significant aspect is the generation of heat through friction and deformation in the roll bite and in a typical Cold Tandem Mill, work roll temperatures normally fall in the range of 55 o C – 70 o C with strip
TelePro periodicallly offers a rolling mill automation technology training program at its offices in St. Charles, Illinois. The program is a detailed treatment of mill automation system design and practical, real-world implementation issues. Single-stand and tandem mill applications in both hot and cold rolling are covered.
The rolling mill control system of claim 1 wherein said gauge detector is positioned between said stands, and including means for delaying said first electrical signal by an amount equal to the time required for material being rolled to travel from said gauge detector to the bite of the rolls of said second stand. 7. In a rolling mill control ...
I claim: 1. In a rolling mill looper control system for controlling a looper arm supporting a looper roller adapted to engage a strip of material to be rolled from a first roll stand to a second roll stand, including a direct-current looper motor for applying torque to said looper arm; a speed regulator for adjusting the speed of at least one of said first and second roll stands to provide a ...
control problem on-line with x0 = x(k) – Apply the optimal input moves u(k) = u 0 – Obtain new measurements, update the state and solve the OLOCP at time k+1 with x0 = x(k+1) – Continue this at each sample time Model Predictive Control (Receding Horizon Control) Implicitly defines the feedback law u(k) = h(x(k))
Automatic rolling process is a high-speed system which always requires high-speed control and communication capabilities. Meanwhile, it is also a typical complex electromechanical system; distributed control has become the mainstream of computer control system for rolling mill. Generally, the control system adopts the 2-level control …
Rolling mill or calendar with crown control of the rolls for rolling flat material US3667272A (en) * : : Davy & United Eng Co Ltd: Rolling mills US3702557A (en) * : : Wean United Inc: Apparatus for supporting yokes for a rolling mill having roll contour control
Controlled rolling is a particular case of thermo-mechanical treatment at high temperatures with the intention of obtaining small ferritic grains which permits an increase in the yield strength and a decrease in the transition temperature.
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A control system for a rolling mill having a pair of housings, at least two rolls supported at their ends within said housings with a gap defined between said rolls, and a pair of hydraulic cylinders respectively operatively associated with said pair of housings for varying said gap defined between said rolls in order to prevent abnormal ...
For over 50 years, Cascade Steel Rolling Mills has been providing the Western U.S. and Canada with high quality steel products produced from recycled scrap metal at our state-of-the-art electric arc furnace steel mill. Our products include reinforcing bar (rebar), coiled reinforcing bar, wire rod, merchant bar and other specialty products.
Abstract: Control of hot-steel rolling mills aims at raising the levels of quality of the related industrial production and at minimising the cost of the electric energy consumed by such industrial units. This paper proposes a non-linear optimal control approach for …
The first step in the control of a tandem mill is to eliminate variations in thickness in the incoming strip. If the strip entering the second stand of the mill has a uniform thickness, then the second and all succeeding stands require little adjustment.
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The flatness control in cold rolling mill is carried out through automatic flatness control (AFC). The control tasks which are to be achieved in the Level 1 closed-loop control for cold rolling mill concerns not only the thickness (AGC) but also the flatness (AFC).
Automated gauge control (AGC) system has taken a wide area of the recent studies that deals with hot and cold rolling mill. These studies had concentrated to …
Steel Rolling Mill System: Control Design Goals. A steel rolling mill produces a sheet of uniform thickness from a slab of steel. It typically consists of several rolling stages, with rollers in each stage compressing the sheet of steel passing through it (Figure 1). In between the roller stages, looper stages maintain the tension in the sheet ...
Rolling mill controls generally are concerned with effecting a change in the roll setting as a function of a change in the rolling pressure. Prior patents that, at least in part, envision such a control are U. S. Pat. No. 2,726,541 that issued to R. B. Sims on Dec. 13, 1955 and No. 3,496,743 that issued to M. D. Stone on Feb. 24, 1970.
The ITC system consists of separate control modes for initial mill threading and steady-state rolling. The threading control mode is configured specifically to establish interstand tension during initial threading. The steady-state or run control mode is configured to reduce interactions between interstand tension and strip thickness.
Rolling mill simulator A new platform for testing, analysis and optimization of cold rolling mills. Axel Brickwedde, Frank Feldmann, Nicolas Soler The cold rolling of flat metal products especially in tandem or multi-stand mills is a highly complex process where the product quality is influenced by various aspects.
Fig 1 Structure of a typical automation system for hot strip mill process. Level 0 – It is the lowest level of control and includes, for example, the control loops for hydraulic capsules used to position the rolls in the rolling mills and for the main electric motors powering the mill.. Level 1 – It is primarily concerned with in-piece control. At this level, the quality parameters …
The rolling process in a finishing mill inherently has interactions between for example thickness control loops and mass flow control loops. Tandem Cold Metal Rolling Mill Control An advantage of this method is that it provides good control of thickness and tension (and thus mass flow ) throughout the entire mill, which enhances the stability ...
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