Aluminum hot and cold rolling mills can produce significant levels of oil mistliquid particulate, visible emissions, andor volatile organic compound voc emissions. Intermediate rolls are designed to have speos curves for wider range of strip crown and. Control of a continuous tandem cold metal rolling process. Risk assessment and control measures for cold rolling mill. Home gallery cold rolling area coated sheets photo gallery tandem mill. Rollers may be plain or grooved depends upon the shape of rolled product. The main identified values are friction and steel hardening. Cold sheet mill, as well as csi customers who purchase full hard unfinished cold roll. Aistech paper form version 8 140221 steel plantech. Vibration control of chatter in tandem cold rolling mill. And then coldrolling is to be done to get good surface finish and close control over dimension.
The most common configuration is the single reversing mill. The automation system will be laid out in close cooperation with johnson controls. Rolling mill element machinery supplies rolling mill. After having passed through the cold rolling mill, the steel strip is hardened. While operating tandem cold rolling mills, it is observed that the products to be rolled and surface conditions of the rolls vary continuously. 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. Page 1 of 8 20metc451 control of the tandem hot strip mill under. Perfect for such an operation are sms group tandem cold mills our powerful flagships in the cold rolling sector. 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. Advanced process and quality control in hot rolling 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 explores an advanced method for control of tandem cold metal rolling processes, based on the emerging statedependent riccati equation technique. 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. 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. 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. Rolling mill machines manufacturer quality tandem rolling. We have the expertise and the complete set up to manufacture the following type of steel plants on turn key basis. Digital optimal control of multistand rolling mills 263 journal of engineering science and technology april 2014, vol. 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. Simaan, fellow, ieee unlike the standalone mill, in. Robust tension control of strip for 5stand tandem cold mills. Considers some of the distributed aspects of the control of modern metal rolling mills. 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. Products flat cold rolling mills lower investment for.
In continuous rolling, the various stands are synchronized so that the strip can be rolled in all stands simultaneously. 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. Optimal solutions can be provided for singlestand reversing roughing mills, multistand finishing mills, twincoiler singlestand finishing mills, and combination plate and coil mills. Edge drop control technology of 4hi tandem cold rolling mill. 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. Report on best available techniques bat in the german. Hot rolling occurs above the recrystallization temperature of the material. International journal of science and technology 11. During the rolling trial, the roll configuration between edw and conventional backup roll didnt match well because of the large fluctuation of strip edge. Sms group supplies three tandem cold mills for lead rolling. 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.
Tandem cold metal rolling mill control springerlink. Ndc technologies provides the laserspeed pro noncontact length speed gauge to the industrys leading steel makers for their cold rolling mill applications. After a short history of tandem cold rolling, various types of cold rolling processes. Rolling of metal auxiliary operations used in connection. A cold mill rolls coils of pickled steel from the pickle line at ambient temperature, using coolant oil. Structure mill tmtqst rebar mill section mill wire rod mill. Our cold rolling mills are available with coolant, filtrations and other accessories. Advanced process and quality control in hot rolling mills using eddy current inspection autor. Modeling, simulation and identification for control of tandem cold. This paper describes a modeling procedure for tandem cold metal rolling, including the linearization step and system identification for control.
Tandem cold metal rolling mill control using practical advanced. Hardened temper rolling mill four roller for carbon steel high elasticity. Finally, the concluding remarks are given in section 6. 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. Review on cold rolling mill roll deformation article pdf available in matter. These aims are supported by high levels of mill sophistication, in terms of plant equipment, instrumentation, actuators and control hardware. Cold rolling mills yogijidigi can be your preferred supplier for cold rolling mills starting from planning, engineering, implementation and modernization of your plant. A setup model for tandem cold rolling mills sciencedirect. 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. Strip thickness control of cold rolling mill with roll. 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. 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.
Tandem cold metal rolling mill control request pdf. Optimization of cold rolling mill process to improve. The tandem cold rolling process is described by a mathematical model based on algebraic equations developed for control purposes and empirical relations. Tmt quenching system and rolling mill stands manufacturer j. 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. We are the leader of steel rolling mill equipment from china with decades experience. The supply scope includes a roll coating that sms group has designed specifically for lead rolling. 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 tandem cold metal rolling mill control the tandem rolling of cold metal strip is a large, highly complex nonlinear multivariable process the.
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. 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. Rolling mill industries is a leading name in the segment of hot steel rolling mills. Rolling is a metal forming process in which metal stock is passed through a pair of rolls. Types of cold rolling mill strip rolling can be done with different type of mills. 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. The roller in contact with the metal are called work roller. This is why, in order to make the steel cold deformable, it needs to undergo a heat treatment. Modeling, simulation and identification for control of. Cold rolling is a process by which the sheet metal or strip stock is introduced between rollers and then compressed and squeezed. Automatic cold reversible rolling mill 4 hi 650mm agc screw down type. An optimal control method for improvement in tandem cold. 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. Dear internet archive supporters, thank you for helping us reach our fundraising goal.
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. The tandem hot metal strip rolling process index termsmetals industry. Cold rolling mill,metal coil cold rolling mill,china cold. A tandem mill is a special type of modern rolling mill where rolling is done in one pass. Some low carbon steel is galvanized coated with zinc. Tandem rolling mill on sales quality tandem rolling mill.
Since then, rolls for coldrolling mills have become an integral part of uralmashplants assortment. Then, this paper deals with new approach to control chatter vibration in 4high tandem cold mill. Steel rolling technology handbook 2nd revised edition. Controlled rolling of a st523 steel at the laboratory mill tandem schindler i. 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. Tandem mill definition is a rolling mill with several stands in succession. The automatic gauge control agc systems and hydraulic. Risk assessment and control measures for cold rolling mill in steel industry. 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 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. Optionally, its possible to arrange them inline as coupled pickling line tandem cold mills pltcm. The tandem cold rolling of metal strip is one process in a sequence of processes performed to convert raw mate. 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.
Rigid 20 high cold rolling mill machinery, high precision stainless steel rolling mill. The tandem cold rolling mill of metal strip is a complex multivariable process whose control presents a significant engineering challenge. Products aluminium and nonferrous metals aluminium hot. Chapter 4 surface finish and friction in cold metal rolling. The research on flatness control simulation for cold tandem.
General principles of cold rolling beyza yesilbag yorulmaz, bilal demir, ali ulus. 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. Nowadays, this problem has been addressed by methods based on the division into various independent control subproblems. The problem of damping of torsional vibrations originates from the rollingmill. 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. 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. 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. Such mills have a range of ever more ambitious targets, for example product quality, yield, metallurgy and throughput. 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. Tandem cold metal rolling mill control using practical. 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. Tandem cold rolling process is a nonlinear complex system with external and internal uncertainties and significant disturbances.
Control of a continuous tandem cold metal rolling process request. This can be done in the batch annealing section or in the continuous annealing and processing line. After a short history of tandem cold rolling, various types of cold rolling processes are described. If these customers are satisfied, external customers will automatically be satisfied. As well as providing an indepth understanding of the theory they will also explain the practical issues of implementing rolling mill control systems. Optimization of a cold rolling mill thermo fisher scientific. Pdf optimal control of continuous tandem cold metal rolling. Emissions occur as a result of coolant evaporation in the mill, and will vary by coolant type. All the requisite tests, such as acceleration up to a maximum speed of 1280 rpm, were concluded during the cold commissioning.
Ntandem consulting, marketing, advertising, internet, mobile. In section 5, thickness control with roll eccentricity compensation has been proposed. The improvement in the quality of the final output depends on the control strategy of centerline thickness and interstand tension. Figure 52 illustrates the sequence of steps in a steel rolling mill to show the variety of products made. A set of roller is called a stand, and in a mill there may be more than one stands.
Computation of rolling stand parameters by genetic algorithm 60 setting too. Cuttingedge coldrolling mills primetals technologies. Used 1250mm 12hi reversible cold rolling mill,1set of single stand cold rolling mill and 2 sets of double stands cold rolling mill. The tandem rolling of cold metal strip is a large, highly complex nonlinear. Depending on the product mix, the production capacity of continuous tandem mills from primetals technologies can exceed 1. It consists of passing metal between two rollers which compress it to reduce its thickness. Pdf control of the tandem hot strip mill under expanded. 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. Rolling is the process of reducing the thickness or changing the cross section. Short stress rolling mill rough middle rolling mill is key part of steel rolling mill. A rolling mill is a machine for plastic deformation of metal between rotating rolls. The development of the theory of metal rolling and its. It is a page of the detail of cold mill tcm,crm of steel plantech.
Modeling, simulation and identification for control of tandem. 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. Technical meaning of hot rolling is rolling the metal material at a temperature higher than its recrystallization. Steel roughing rolling mill stand hani steel rolling mill. The b216series was supported by a dedicated staff to achieve the following results. Agc hydraulic 6 hi cold rolling mill 700mm carbon steel 390m min speed. 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. 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. 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. Abstractthe cold tandem rolling of metal strip presents a significant control. In section 6, simulation results have been presented. The model computes friction coefficient, steel hardening, roll force and torque according to real data measured on the mill.
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. Using practical advanced methods advances in industrial control pittner, john, simaan, marwan a. These models are used in setup programs for schedule optimisation, for online control algorithms and to help. Computation of rolling stand parameters by genetic algorithm. The cold mill produces steel and stainless steel and is also used for aluminum, aluminum foil, and copper. This paper focuses on interstand tension control problem in 5stand tandem cold rolling mills.
Our service will help increase your market awarness and roi. Cold rolling csis cold reduction mill is a series of five rolling mills, or. 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. Tandem cold metal rolling mill control deals primarily with a novel 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. Adaptation for tandem cold mill models engenharia eletrica. Tandem coldmill solutions by primetals technologies.
Tandem mill definition of tandem mill by merriamwebster. The tandem cold rolling of metal strip is a large, highly complex nonlinear multivariable process the control of which poses a significant engineering challenge. This type of model is often called torqueforce model. Tandem mill rolling b216series the solution the 25 years of success were not accomplished by product alone. Optimal control of continuous tandem cold metal rolling john pittner, member, ieee, and marwan a. In a broader sense, a rolling mill is an automatic system or line of machines that performs both rolling and auxiliary operations. In general, the rolling mill automation technology to deal with the control problem by.
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. Use features like bookmarks, note taking and highlighting while reading tandem cold metal rolling mill control. This entails that it is no longer able to be processed further. 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. The present technology is based on methods that divide the control problem.
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