The main function of the control system of a tandem cold rolling mill is to produce the strip with a prescribed thickness accuracy and to maintain the interstand tensions within a a reasonable range in the rolling operation, against disturbances such as the mill input thickness, the stand setup error, the drift of ingoing strip hardness, the. The tandem hot metal strip rolling process index termsmetals industry. Rolling is a metal forming process in which metal stock is passed through a pair of rolls. A set of roller is called a stand, and in a mill there may be more than one stands. Then, this paper deals with new approach to control chatter vibration in 4high tandem cold mill. Strip thickness control of cold rolling mill with roll. Rolling mill industries is a leading name in the segment of hot steel rolling mills. As well as providing an indepth understanding of the theory they will also explain the practical issues of implementing rolling mill control systems. The improvement in the quality of the final output depends on the control strategy of centerline thickness and interstand tension. These aims are supported by high levels of mill sophistication, in terms of plant equipment, instrumentation, actuators and control hardware. 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. A rolling mill consisting of two or more stands arranged so that the metal being processed travels in a straight line from stand to stand. International journal of science and technology 11.
The cold mill produces steel and stainless steel and is also used for aluminum, aluminum foil, and copper. Steel rolling technology handbook 2nd revised edition. Sms group supplies three tandem cold mills for lead rolling. Automatic cold reversible rolling mill 4 hi 650mm agc screw down type. The b216series was supported by a dedicated staff to achieve the following results. Hot rolling occurs above the recrystallization temperature of the material. Hardened temper rolling mill four roller for carbon steel high elasticity.
After a short history of tandem cold rolling, various types of cold rolling processes are described. The tandem rolling of cold metal strip is a large, highly complex nonlinear. A 3 high rolling mill consists of three rolls and is typically used for either performing multiple reduction passes by wrapping material around the center mill roll, or for bonding of dissimilar stacked material passed through the mill. Tandem cold rolling process is a nonlinear complex system with external and internal uncertainties and significant disturbances. This paper focuses on interstand tension control problem in 5stand tandem cold rolling mills. Design, manufacturing, installation, sales and aftersales servicing of steelmaking machinery, nonferrous metal producing machinery, and cokemaking machinery as well as related equipment for use in japan and overseas. The combined pickling line tandem cold mill is a prime example of the newly developed hightech mills and is designed as endless mill for an annual.
Pdf control of the tandem hot strip mill under expanded. Cold rolling mill,metal coil cold rolling mill,china cold. Controlit for cold rolling mills technological control for cold rolling processes rolling of flat metal products is a complex process where the quality of the product is influenced by various factors like incoming material, mechanical and electrical equipment, lubrication, control strategies etc. The tandem cold rolling process is described by a mathematical model based on algebraic equations developed for control purposes and empirical relations. Adaptation for tandem cold mill models engenharia eletrica. This paper describes a modeling procedure for tandem cold metal rolling, including the linearization step and system identification for control. Ndc technologies provides the laserspeed pro noncontact length speed gauge to the industrys leading steel makers for their cold rolling mill applications. The automation system will be laid out in close cooperation with johnson controls. The development of the theory of metal rolling and its. Home gallery cold rolling area coated sheets photo gallery tandem mill. Cold rolling csis cold reduction mill is a series of five rolling mills, or. Tandem cold metal rolling mill control using practical. This work aims at showing the deduction of a model, tailored for control, for a tandem cold metal rolling of 5stands, the dynamic simulation of this process and results with application of simf 8, a new subspace identification method implementation that will be employed as basis for the research and development in new controllers.
Short stress rolling mill rough middle rolling mill is key part of steel rolling mill. A rolling mill is a complex machine having two or more working rollers, supporting rollers, roll stands, drive motor, reducing gear, flywheel, coupling gear etc. Tandem mill definition is a rolling mill with several stands in succession. It consists of passing metal between two rollers which compress it to reduce its thickness. The cold metal rolling industry needs reliable and accurate models to improve predictions of surface finish and friction and thus increase productivity and improve quality. Page 1 of 8 20metc451 control of the tandem hot strip mill under. Controlling the tandem cold rolling of metal strip is a significant engineering challenge mostly because of the complexity of the interactions between the process variables, the nonlinearities which change with the operating conditions, and the long time delays which change significantly with the mill speed. Controlled rolling of a st523 steel at the laboratory mill tandem schindler i. Cuttingedge coldrolling mills primetals technologies. We have the expertise and the complete set up to manufacture the following type of steel plants on turn key basis. For gaining strip edge drop controllability and increasing roll grinding precision, the edge drop control work roll edw was developed and designed in 1700 mm tandem cold rolling mill. Computation of rolling stand parameters by genetic algorithm. Tandem cold metal rolling mill control using practical advanced. Rolling mill machines manufacturer quality tandem rolling.
The tandem cold rolling mill of metal strip is a complex multivariable process whose control presents a significant engineering challenge. Depending on the product mix, the production capacity of continuous tandem mills from primetals technologies can exceed 1. Vibration control of chatter in tandem cold rolling mill. The roller in contact with the metal are called work roller. The tandem cold rolling of metal strip is one process in a sequence of processes performed to convert raw mate. The main identified values are friction and steel hardening. Sixhigh singlestand reversible cold rolling line the singlestand reversible cold rolling line supplied by cisdi on ep basis is the one with highest rolling speed 1,200mmin. Intermediate rolls are designed to have speos curves for wider range of strip crown and.
Referred to as ultrathin rolling control, the system is essentially an adapted control concept that has been successfully applied many times in tandem cold mills. Optimization of cold rolling mill process to improve. It is a page of the detail of cold mill tcm,crm of steel plantech. The problem of damping of torsional vibrations originates from the rollingmill. Optionally, its possible to arrange them inline as coupled pickling line tandem cold mills pltcm. Advanced process and quality control in hot rolling mills. The supply scope includes a roll coating that sms group has designed specifically for lead rolling. Our cold rolling mills are available with coolant, filtrations and other accessories. Existing controllers have proven to be susceptible to disturbances and uncertainties in process variables and attempts to increase robustness to these phenomena have had their own drawbacks so a new approach is needed. Modeling, simulation and identification for control of tandem. The tandem cold rolling of metal strip is a large, highly complex nonlinear multivariable process the control of which poses a significant engineering challenge. In a broader sense, a rolling mill is an automatic system or line of machines that performs both rolling and auxiliary operations. Perfect for such an operation are sms group tandem cold mills our powerful flagships in the cold rolling sector.
This can be done in the batch annealing section or in the continuous annealing and processing line. An optimal control method for improvement in tandem cold. Using practical advanced methods advances in industrial control kindle edition by pittner, john, simaan, marwan a download it once and read it on your kindle device, pc, phones or tablets. Tandem cold mill tandem cold mill solutions from primetals technologies stand for high product yields combined with flexible production, low operational costs and simplified maintenance work. Figure 52 illustrates the sequence of steps in a steel rolling mill to show the variety of products made. Tandem rolling mill on sales quality tandem rolling mill. Optimal solutions can be provided for singlestand reversing roughing mills, multistand finishing mills, twincoiler singlestand finishing mills, and combination plate and coil mills. Ntandem is a top marketing company and technology agency in mississippi providing branding, advertising, online products and user engagement services. Tandem cold metal rolling mill control deals primarily with a novel and. Computation of rolling stand parameters by genetic algorithm 60 setting too. In general, the rolling mill automation technology to deal with the control problem by.
Steel roughing rolling mill stand hani steel rolling mill. Stresses from hertzian pressure in 4high cold mill back up rolls were measured years ago, the results were never published, but of high interest also, maybe later. Rolling is the process of reducing the thickness or changing the cross section. A basic understanding of the mechanics of rolling mill rolls file. The automatic gauge control agc systems and hydraulic. Review on cold rolling mill roll deformation article pdf available in matter. Optimization of a cold rolling mill thermo fisher scientific. And then coldrolling is to be done to get good surface finish and close control over dimension. Technical meaning of hot rolling is rolling the metal material at a temperature higher than its recrystallization. For controlling the flatness of the strip during the rolling of aluminum strip or foil, the system consists of a full width bank of cryogenic roll cooling devices acting on the rolls and a full width bank of roll heating devices also acting the rolls. The continuous tandem cold rolling of metal strip is a complex multivariable process whose control presents engineering challenges in addition to those generally encountered in the case of the standalone cold rolling process. Used 1250mm 12hi reversible cold rolling mill,1set of single stand cold rolling mill and 2 sets of double stands cold rolling mill.
Nowadays, this problem has been addressed by methods based on the division into various independent control subproblems. After a short history of tandem cold rolling, various types of cold rolling processes. Danieli wean uniteds cold rolling technology 4high and 6high allows producers to achieve superior strip surface and profile quality, with lower production and maintenance costs, while providing the highest possible levels of production flexibility and plant efficiency. In a traditional rolling mill rolling is done in several passes, but in tandem mill there are several stands 2 stands and reductions take place successively. Finally, the concluding remarks are given in section 6. A cold mill rolls coils of pickled steel from the pickle line at ambient temperature, using coolant oil. Considers some of the distributed aspects of the control of modern metal rolling mills. Tmt quenching system and rolling mill stands manufacturer j. Optimal control of continuous tandem cold metal rolling john pittner, member, ieee, and marwan a. Control of a continuous tandem cold metal rolling process request. This entails that it is no longer able to be processed further.
Pdf optimal control of continuous tandem cold metal rolling. Cold rolling is a process by which the sheet metal or strip stock is introduced between rollers and then compressed and squeezed. Report on best available techniques bat in the german. Rolling mill element machinery supplies rolling mill. Advanced control 9th international rolling mill academy 59 november 2007 glasgow, scotland the lectures will be given by leading international experts in hot and cold mill control systems. We are the leader of steel rolling mill equipment from china with decades experience. The research on flatness control simulation for cold tandem. Types of cold rolling mill strip rolling can be done with different type of mills. These challenges arise during the passage of the weld, which joins the head of the next strip to the tail of the present strip to maintain the continuity of rolling.
In section 5, thickness control with roll eccentricity compensation has been proposed. Cold rolling mills yogijidigi can be your preferred supplier for cold rolling mills starting from planning, engineering, implementation and modernization of your plant. Dear internet archive supporters, thank you for helping us reach our fundraising goal. Control of a continuous tandem cold metal rolling process. Chapter 4 surface finish and friction in cold metal rolling. Three stage age for tandem cold mill feedforward agc for tandem cold mill flowstress feedforward agc noninteractive agc automatic tension and gauge control system interstand tension control in hot strip mills. Digital optimal control of multistand rolling mills 263 journal of engineering science and technology april 2014, vol.
A rolling mill is a machine for plastic deformation of metal between rotating rolls. Mills for cold reduction mill technology fullliners, who keeps the stateoftheartdesign competence with enhanced technology for the various mill cold rolling mill type typical mill stand types production capacity ty strip speed type mmin functions. We are professional steel roughing rolling mill stand china mill stand plant manufacturer and supplier, we are equipped with decades experience engineers, modern factory, and plant, as well as providing with rolling mill stand, wire rod mill, rebar rolling mill, mini rolling mill, tmt rolling mill, hot rolling mill, cold rolling mill, etc. Tandem mill definition of tandem mill by merriamwebster. If these customers are satisfied, external customers will automatically be satisfied. Optimization of a cold rolling mill with a high speed xray thickness gauge christopher burnett, thermo fisher scientific, mount airy, md, united states white paper abstract the high speed production achieved by modern cold rolling mills requires reliable and robust thickness sensors. Robust tension control of strip for 5stand tandem cold mills. After having passed through the cold rolling mill, the steel strip is hardened. Tandem mill rolling b216series the solution the 25 years of success were not accomplished by product alone. Modeling, simulation and identification for control of tandem cold. Optimal control of continuous tandem cold metal rolling. Abstractthe cold tandem rolling of metal strip presents a significant control. Tandem cold metal rolling mill control explores an advanced method for control of tandem cold metal rolling processes, based on the emerging statedependent riccati equation technique. Risk assessment and control measures for cold rolling mill in steel industry.
Products aluminium and nonferrous metals aluminium hot. The tandem cold rolling of metal is a high complex engineering process, with interactions of the multiple process variables, nonlinearities and time delays, both extremely dependents of the operating conditions and of the speed rolling mill. Ntandem consulting, marketing, advertising, internet, mobile. The installation of the new motors, the recabeling of the connections for the supply and auxiliaries, the optimization of the parameters and the hot commissioning were all carried out. The continuous tandem cold rolling of metal strip is a highly nonlinear multivariable complex process the control of which presents additional challenges over those encountered in the control of.
In section 6, simulation results have been presented. Some low carbon steel is galvanized coated with zinc. Modeling, simulation and identification for control of. Edge drop control technology of 4hi tandem cold rolling mill. A tandem mill is a special type of modern rolling mill where rolling is done in one pass. Rolling theory can be divided into two broad and general cate gories, that which applies to hot rolling and that which applies to cold rolling. Our service will help increase your market awarness and roi. All the requisite tests, such as acceleration up to a maximum speed of 1280 rpm, were concluded during the cold commissioning. Using practical advanced methods advances in industrial control pittner, john, simaan, marwan a. In hot rolling the yield stress characteristic of the metal is strain rate dependent and frictional force between the roll and stock is high. Request pdf control of a continuous tandem cold metal rolling process the. The model computes friction coefficient, steel hardening, roll force and torque according to real data measured on the mill. The most common configuration is the single reversing mill. During the rolling trial, the roll configuration between edw and conventional backup roll didnt match well because of the large fluctuation of strip edge.
Agc hydraulic 6 hi cold rolling mill 700mm carbon steel 390m min speed. Because the coils are rerolled at roughly room temperature, thinner gauges, tighter tolerances, and a superior surface quality are produced than can be rolled by the hot mill. This paper describes a dynamic simulator of the tandem cold metal rolling, implemented in matlabsimulink, that is able to implement new control strategies and combinations of optimizations techniques. Risk assessment and control measures for cold rolling mill. One has to efficiently calculate and control the various process variables of a tandem cold rolling mill to maintain high levels of product quality and productivity and to minimize the overall rolling cost. Request pdf tandem cold metal rolling mill control the tandem rolling of cold metal strip is a large, highly complex nonlinear multivariable process the.
The present technology is based on methods that divide the control problem. Dec 01, 2010 tandem cold metal rolling mill control deals primarily with a novel and practical advanced method for control of tandem cold metal rolling processes based on the recently emerging statedependent riccati equation technique. Products flat cold rolling mills lower investment for. Structure mill tmtqst rebar mill section mill wire rod mill. Rolling of metal auxiliary operations used in connection. General principles of cold rolling beyza yesilbag yorulmaz, bilal demir, ali ulus. Tandem cold metal rolling mill control deals primarily with a novel and practical advanced method for control of the tandem cold metal rolling processes based on the statedependent riccati equation technique which is recently emerging as a useful method for control of complex nonlinear systems.
Tandem coldmill solutions by primetals technologies. Modeling, simulation and identification for control of tandem cold metal rolling this work aims at showing the deduction of a model, tailored for control, for a tandem cold metal rolling of 5stands, the dynamic simulation of this process and results with application of simf8, a new subspace identification. Simaan, fellow, ieee unlike the standalone mill, in. Rollers may be plain or grooved depends upon the shape of rolled product. These models are used in setup programs for schedule optimisation, for online control algorithms and to help. Because of exceptionally high requirements to the quality of metal used for production of cold mill rolls, retooling and modernization of the production plant were carried out by the 1940. Challenges an aluminum hot line utilizing a single stand breakdown reversing mill feeding a fourstand tandem hot mill had been using the b216series. Positive and negative roll benders for work rolls and intermediate rolls, roll shift device for intermediate rolls are provided for all stands. Danieli has a full range of flexible hot mill configurations to meet customers requirements. Advanced process and quality control in hot rolling mills using eddy current inspection autor. You can operate them in either batch or continuous mode as ctcm continuous tandem cold mill. This type of model is often called torqueforce model. Aluminum hot and cold rolling mills can produce significant levels of oil mistliquid particulate, visible emissions, andor volatile organic compound voc emissions. The manufacture, preassembly and testing of the three cold rolling mills will take place in china, according to the specifications drawn up by johnson controls.
While operating tandem cold rolling mills, it is observed that the products to be rolled and surface conditions of the rolls vary continuously. Such mills have a range of ever more ambitious targets, for example product quality, yield, metallurgy and throughput. A setup model for tandem cold rolling mills sciencedirect. This is why, in order to make the steel cold deformable, it needs to undergo a heat treatment. Emissions occur as a result of coolant evaporation in the mill, and will vary by coolant type. Aistech paper form version 8 140221 steel plantech. Since then, rolls for coldrolling mills have become an integral part of uralmashplants assortment. Various mill designs are offered that include 6high ucms universal crown control mill, zr mills and 12high coldrolling mills with smalldiameter work rolls for the efficient rolling of materials of high hardness. Similar steps occur in other basic metal industries. Tandem cold metal rolling mill control springerlink. The continuous tandem cold rolling of metal strip is a highly nonlinear multivariable complex process the control of which presents additional challenges over those encountered in the control of standalone tandem cold rolling. Tandem cold metal rolling mill control request pdf. Rigid 20 high cold rolling mill machinery, high precision stainless steel rolling mill. In continuous rolling, the various stands are synchronized so that the strip can be rolled in all stands simultaneously.
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