This paper analyzes the rolling characteristics of tandem cold rolling process and proposes an innovative multivariable. Stresses beyond yield strength of the workpiece material is required. 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. Us3934438a method of longedge shape control for tandem. Initially, rolled strips of sheet were formed into a circular cross section by funnel arrangements or rolls, and then butt or lap welded in the same heat forge welding process. Prime quality turnkey services primetals technologies. Cold rolling mill rolling metalworking chemical elements.
The ingots are rolled to produce aluminum sheet and plate products. Cold forming cold working any mechanical operation that creates permanent deformation, such as bending, rolling, drawing, etc. Edge drop control technology of 4hi tandem cold rolling mill. After a short history of tandem cold rolling, various types of cold rolling processes. Hobbing hobbing is the most common process for creating gears. Tandem coldmill solutions by primetals technologies. Cold rolled steel sheeting this material is manufactured by rerolling and cold reduction of hot rolled steel sheeting. Pdf tandem cold rolling mill modeling for multivariable control. Steering control units series 5 6 series 10 6 series 20 6 series 25 6 series 40 6 steering accessories 6 vane pumps vmq 6 vvq 6 v10v20 7 vvsvvp 7 vqh 7 open circuit piston pumps 420 7 pvb 7 pvq 7 pve 7 pvh 8 pvm 8 pvxs 8 pvws 8. Steel pipe manufacturing processes mandrel mill process. Equipment at these facilities includes a computerized, threestand, fourhigh tandem mill and eight singlestand, two and fourhigh mills. Over 10 million scientific documents at your fingertips.
The pickler was linked to a sheet steel cold reduction section that consisted of a fivestand tandem mill. Tandem cold metal rolling mill control springerlink. In section 5, thickness control with roll eccentricity compensation has been proposed. Part of the advances in industrial control book series aic. A specialized mill called a hobbing machine is programmed to cut gear teeth into blank stock.
Request pdf tandem cold metal rolling mill control the tandem rolling of cold metal strip is a large, highly complex nonlinear multivariable process the control of which poses a significant. Rolling mill vibration is a worldwide problem, although it has been found that the mill structure defects are the main cause of vibration, but the inhibition measures are difficult to implement. The gear teeth are cut into the metal with a continuous rotary motion. Electric tandem rolling mill continuous 700mm 5 stand carbon. Generic safe work procedures are discouraged as they may tend to overlook specific circumstances such as location, weather, knowledge and experience required, time of day, other equipment involved, etc. The 5stand tandem cold reduction mill csis tandem cold reduction mill was completely modernized in 1997 and typically processes seven out of every eight pickled coils. Jul 18, 2014 cold rolling continuous mill steel strip single stand tandem reversing plate sheet. A typical five stand tandem cold rolling mill is illustrated in figure 1. Metal forming processes indian institute of technology. The first step taken in the process is when a hot rolled steel coil is unwound and passed through rolls which flex the plating in such a manner as to break and fragment the mill scale. This machine is the new generation of 4roll 6roll continuous cold rolling mill, its the remodel product of high precision cold rolling mill on the basis of studying the advanced rolling mill from abroad combining our national condition. The tandem mill consists of three to six mill stands arranged in series to progressively reduce the thickness of the strip in a single pass.
Its rolling mills include automatic gauge control systems with hydraulic screw downs allowing for microsecond adjustments during processing. Front and schiller playground 32 12 16 asphalt paving. 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. Cold mill tcm,crm steel plantech proposes a cuttingedge tandem cold mill 4hi6hi according to the customers needs. Fundamentals of roll cooling and control of flatness at primary cold reduction daron lloyd managing director, lechler ltd preamble 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. So that a continuous pass may be made through each one successively with change the direction of. So that a continuous pass may be made through each one successively with change the direction of material. We can also provide total engineering, including auxiliary equipment such as utility facilities, inspection lines and roll shops. Electric tandem rolling mill continuous 700mm 5 stand carbon steel agc.
Commercial plumbing maintenance and repair services. Models metal wheels, wire grab irons, window glass, and plenty of weight. This representation followed the format given by equation 23. Introduction the tandem cold rolling of metal is a highly complex engineering process, with interactions of the multiple. Nitin seth modern tendencies in production of metal powders for additive manufacturing tandem cold metal rolling mill. A typical one of conventional systems of the type as described above is illustrated in fig. Industrial dosing dispensers are divided into two main groups. The rolling operations consist of two distinct phases.
Core microstructure precision forgings to shape the future forged steel work rolls for tandem and reversing cold reduction mills typical hardness profiles for standard and rmsfalcon grades. The most common configuration is the single reversing mill. Most of the tandem cold rolling mills are equipped with one or two flatness measurement device used for realtime control and flatness assessment of the strips. Delivery of a solo swiss type profitherm p150 heat treatment line for the aviation industry in china. Identification and optimization for hydraulic roll gap. Metal forming and the finite element method, new york. With expert teams committed to your success, we form a trusted partnership with each customer. 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. In fact, this is the major contributor believed to have prevented the solar array from initially deploying while the spacecraft was attached to. Show full abstract then a vcr varying contact backup roll was designed for the rolling conditions of pltcm pickling line combined with tandem cold rolling mill and has been applied to 1700. Close cooperation with all our technological departments ensures that projects can be executed exactly in line with your individual requirements at prime quality.
Rolling mill arrangements commonly used in manufacturing industry today include the two high mill, the two high reversing mill, the three high mill, the four high mill, the. Introduction modern steel strip cold rolling involves tandem mills consisting of typically five successive sixhigh 6 rolls stands with complex actuations. Hgc system offline identification scheme was designed for a tandem cold strip mill, the system model parameters were identified by arx model, and the identified model was verified. Ms office documents are in downloadable, selfexecuting. For this plant, synthesis is executed by the mfile dkit from the robust. Rolling is the process of reducing the thickness or changing the cross section of a long workpiece by compressive forces applied through a set of rolls, as shown in figure 51. References background the demand for rolled products has increased tremendously in automobile, aircraft, food and other industries. Outstanding mill product quality has been achieved along with record breaking production. Statement of basis for us marines spokane clean air. Under conditions of cold temperature 44 f and the balling up phenomenon of mos2, moisture molecules could create frozen balls in the path of the rolling elements impeding available driving torque. The tandem rolling of cold metal strip is a large, highly complex nonlinear multivariable process. Strip thickness control of cold rolling mill with roll.
The improvement in the quality of the final output depends on the control strategy of centerline thickness and interstand tension. After having passed through the cold rolling mill, the steel strip is hardened. Jun 12, 2015 in order to improve the control performance of strip rolling mill, theoretical model of the hydraulic gap control hgc system was established. In section 6, simulation results have been presented. Request pdf tandem cold metal rolling mill control the tandem rolling of cold metal strip is a large, highly complex nonlinear multivariable process the. Pdf the tandem hot metal strip rolling process is a highly complex nonlinear. Tandem cold rolling process is a nonlinear complex system with external and internal uncertainties and significant disturbances. Special farm equipment retirement auction for mark lemke.
Robust tension control of strip for 5stand tandem cold mills. The model computes friction coefficient, steel hardening, roll force and torque according to real data measured on the mill. Perfect for such an operation are sms group tandem cold mills our powerful flagships in the cold rolling sector. Edge drop control technology of 4hi tandem cold rolling mill on the premise of considering roll grinding accuracy p. During this process, the overall finish and granule structure of the material is is made more pure and workable. 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. Hot and cold metalworking between two or more rolls has been in existence since long before the industrial revolution. This paper analyzes the rolling characteristics of tandem coldrolling process and proposes an innovative. A reversible cold rolling method for performing a plurality of passes of cold rolling while changing rolling. Fundamentals of roll cooling and control of flatness at. Tandem cold metal rolling mill control deals primarily with a novel and. This paper focuses on interstand tension control problem in 5stand tandem cold rolling mills. The combined pickling linetandem cold mill is a prime example of the newly developed hightech mills and is designed as endless mill for an annual. 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.
A value of a speed of the work thus obtained is processed by a tandem rolling controlling section together with a value of a load and another value of a rotational speed of rolls. The weight of rolls may vary from a few kilograms up to 250 tonnes. The advent of rolling mill technology and its development during the first half of the nineteenth century also heralded in the industrial manufacture of tube and pipe. It is a set of two or three stands of roll set in parallel alignment. Primetals technologies is your reliable partner with worldwide experience in the development and implementation of turnkey plants. Optionally, its possible to arrange them inline as coupled pickling line tandem cold mills pltcm. An advanced 3d mathematical model for a 6high tandem cold.
Computation of rolling stand parameters by genetic algorithm. The ncmc, which replaced the old cold mill, housed an inline continuous pickler, which cleaned steel prior to rolling. The food and drug administration fda or we is issuing a final rule to establish requirements for shippers, loaders, carriers by motor vehicle and rail vehicle, and receivers engaged in the transportation of food, including food for animals, to use sanitary transportation practices to ensure the. Laser welding is a noncontact process that allows metal parts to be assembled. Depending on the product mix, the production capacity of continuous tandem mills from primetals technologies can exceed 1. Its rolling mills include automatic gauge control systems with. The company has the capability to process coils up to a maximum of 72 inch outside diameter and roll widths of up to 50 inches. The tandem coldrolling process is a multivariable, nonlinear, and strongly coupled complex control procedure, in which the key technologies of automatic gauge control agc and automatic tension control atc are extremely comprehensive, and high precision is required. Suranaree university of technology janmar 2007 objectives objectives this chapter provides information on different types of metal rolling processes which can also be divided in to hot and cold rolling process. Fifth octave chatter occurs in the frequency range of 550 650 hz fifth octave from me 340 at mcmaster university.
Primetals technologies therefore offers solutions based on the digitalization of all key intralogistics processes in a steel plant, which allows for a more efficient flow of materials and goods, minimized production buffers, more predictable intralogistics processes, increased production output, and greater profitability overall. Tandem cold rolling process is a nonlinear complex system with external and. A four high rolling mill is used for the hot rolling of armor and other plates as well as cold rolling of plates, sheets and strips. This is a great resource for people who tend to misplace important documents, especially those that dont see much use. Since decades, chicago pneumatic has a heart for the general industry and matches your highest demands with the. Our newsletter brings you the best of these finds, as well as helpful product tips and advice. Pdf a useful control model for tandem hot metal strip rolling. Procedia engineering 207 2017 7984 2 xiawei feng et al. You can operate them in either batch or continuous mode as ctcm continuous tandem cold mill. This phenomenon causes severe damage for the mill machine and strip quality fig. In addition to pioneering design, highimpact technology, and durability, chicago pneumatic means customer value. The tandem cold rolling could be modeled as a strongly nonlinear. An advanced 3d mathematical model for a 6high tandem. Sms group offers various cold roll mill technologies for copper, steel and aluminum like tandem cold mill, 18 hs mill, reversing mill, skin pass mill, single stand cold mill.
A global approach, iron and steel engineer, 1997, 744. Controlled rolling of a st523 steel at the laboratory mill tandem schindler i. Taking the offline identified parameters as the initial values, online. This handy web application can help you save both time and effort as you browse the web to find a particular manual. Public informational meeting on the former sparrows point. Nov 29, 2018 the tandem cold rolling process is a multivariable, nonlinear, and strongly coupled complex control procedure, in which the key technologies of automatic gauge control agc and automatic tension control atc are extremely comprehensive, and high precision is required. A tandem cold rolling mill permits to reduce the thickness of a steel strip while ensuring the required mechanical properties.
The hot line is used in the initial rolling process. Development of simulation system of strip flatness for hot tandem mill, proceedings of the fourth baostee1. To promote tension control of cold rolling mills, two advanced robust control. The tandem cold rolling of metal strip is one process in a sequence of processes performed to convert raw mate. Introduction modern steel strip cold rolling involves tandem mills consisting of typically five successive sixhigh 6 rolls. Tandem cold metal rolling mill control using practical advanced. F amilies of stainless steel 9 10 medium and high crbased jfemh1 15cr1. Dec 01, 2010 the tandem cold rolling of metal strip is a large, highly complex nonlinear multivariable process the control of which poses a significant engineering challenge.
Modeling, simulation and identification for control of tandem cold. Mathematical approaches are introduced for the understanding of load calculation in rolling processes. Strip faults, due to rolling mill vibration the integrated control process is made to analyse the vibrations which are produced on the work roll chocks and backup roll chocks. Cold rolling mills metal processing machinery american steel. The tandem rolling of cold metal strip is a large, highly complex nonlinear multivariable process the control of which poses a significant engineering challenge. Rolling mills often vary in the type, number, and position of rolls. Under rolling conditions the contact area between roll and stock suffers wear, the other parts of a roll body and necks have to be considered as normal parts of designed components under high. So we discussed the rolling force parameters influence on rolling mill vibration and suppression measures from rolling technology in this article. Modern metal cutting a practical handbook sandvik pdf. This invention relates to a tandem rolling control system for controlling rolling speed in each stand of a hot or cold tandem rolling mill. Various mill designs are offered that include 6high ucms universal crown control mill, zr mills and 12high cold rolling mills with smalldiameter work rolls for the efficient rolling of materials of high hardness. The main identified values are friction and steel hardening. Automation and drive systems for the metals industry.
The place where all the equipment for metal rolling manufacture is set up is called a rolling mill. Computation of rolling stand parameters by genetic algorithm 60 setting too. Tandem cold metal rolling mill control request pdf. Fifth octave chatter occurs in the frequency range of 550. Cold rolling is used to reduce the temperature of the material being worked with while also increase how hard and strong the material gets during the rolling mill process. Intermediate roll contour of 6hi ucm cold rolling mill. A setup model for tandem cold rolling mills rolling. When most people think of a rolling mill, they visualize sizable machinery in ferrous iron, carbon steel. A method of shape control for a tandem mill for rolling strip, wherein the shape of the rolled strip at the delivery side of the final stand is detected to provide a signal corresponding to the longedge shape, whereby the pattern of roll bending force for two or more latter stands are adjusted according to the signal or signals obtained in order to effect desired shape control without causing. Cold rolling continuous mill steel strip single stand tandem. One of our tandem mills works exclusively for the automotive industry, the other produces products for the remaining branches.
As a matter of fact, leonardo da vinci was credited for the metalworking mill prior to his death in 1519. Computer controlled continuous tandem cold rolling mill. M14152 the ncmc, which replaced the old cold mill, housed an inline continuous pickler, which cleaned steel prior to rolling. This type of model is often called torqueforce model.
Modeling, simulation and identification for control of tandem. Outline of reversing cold rolling mill 1 outline of reversing cold rolling mill and rolling method as illustrated in figure 1, a reversing cold rolling mill is comprised mainly of a mill proper, a winding machine payoff reel, an entry winding machine entry tension reel and delivery winding machine delivery tension reel. Original printed hours were not to betractor sells w4796 hrs. Tandem cold rolling mills are named by their stand arrangement and designed as sheet mills if they reduce hot band to sheet gauge or tin mills if they roll the same incoming material to tinplate stock. Hot rolling is performed above the recrystallization temperature of the alloy being processed. A continuous tandem mill has a welder and accumulator looper at the entry end to join successive coils of pickled hot rolled material. Its primary function is to reduce the thickness of the steel to between 12 and 110th of its hotrolled gauge without first reheating it. Cuttingedge coldrolling mills primetals technologies.
In order to improve the control performance of strip rolling mill, theoretical model of the hydraulic gap control hgc system was established. Federal register sanitary transportation of human and. The tandem mills consists out of a series of rolling stands that thin the steel strips. Finally identification of defects occurring during and its solutions. A system for controlling interstand tension of a tandem rolling mill includes a detector for directly detecting a travelling speed of a work between two neighboring stands. New advanced control strategy for steel making process. Tandem cold mill solutions from primetals technologies stand for high product yields combined with flexible production, low operational costs and simplified maintenance work. Tandem cold mills single and multistand reversing mills temper mills sendzimir mills coiler control process lines tmeic has developed strip transport controls based on power analysis of all. A tandem mill is a special type of modern rolling mill where rolling is done in one pass. Chicago pneumatic represents tools and compressors that are engineered for high performance. Simaan tandem cold metal rolling mill control addeddate 20625 15.
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