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. 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. Electric tandem rolling mill continuous 700mm 5 stand carbon steel agc. 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 setup model for tandem cold rolling mills rolling. The model computes friction coefficient, steel hardening, roll force and torque according to real data measured on the mill. Automation and drive systems for the metals industry. To promote tension control of cold rolling mills, two advanced robust control. Equipment at these facilities includes a computerized, threestand, fourhigh tandem mill and eight singlestand, two and fourhigh mills.
You can operate them in either batch or continuous mode as ctcm continuous tandem cold mill. 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. 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. Federal register sanitary transportation of human and. The hot line is used in the initial rolling process. Metal forming and the finite element method, new york. 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. A reversible cold rolling method for performing a plurality of passes of cold rolling while changing rolling.
Tandem cold metal rolling mill control request pdf. Metal forming processes indian institute of technology. It is a set of two or three stands of roll set in parallel alignment. The main identified values are friction and steel hardening. 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. Tandem coldmill solutions by primetals technologies. 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. M14152 the ncmc, which replaced the old cold mill, housed an inline continuous pickler, which cleaned steel prior to rolling. Introduction modern steel strip cold rolling involves tandem mills consisting of typically five successive sixhigh 6 rolls. 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.
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. Edge drop control technology of 4hi tandem cold rolling mill on the premise of considering roll grinding accuracy p. 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. 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. A global approach, iron and steel engineer, 1997, 744. Prime quality turnkey services primetals technologies.
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. Statement of basis for us marines spokane clean air. In fact, this is the major contributor believed to have prevented the solar array from initially deploying while the spacecraft was attached to. The tandem mills consists out of a series of rolling stands that thin the steel strips.
The gear teeth are cut into the metal with a continuous rotary motion. The pickler was linked to a sheet steel cold reduction section that consisted of a fivestand tandem mill. The ingots are rolled to produce aluminum sheet and plate products. A tandem mill is a special type of modern rolling mill where rolling is done in one pass. Request pdf tandem cold metal rolling mill control the tandem rolling of cold metal strip is a large, highly complex nonlinear multivariable process the. A typical one of conventional systems of the type as described above is illustrated in fig. 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. This paper focuses on interstand tension control problem in 5stand tandem cold rolling mills.
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. This paper analyzes the rolling characteristics of tandem cold rolling process and proposes an innovative multivariable. 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. Wabash national leads the nation in americanmade semitrailer and tank trailer production, a direct result of the decades of technological innovations weve developed to create customerdriven solutions. 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. 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. In section 6, simulation results have been presented. 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. Us3934438a method of longedge shape control for tandem. Hobbing hobbing is the most common process for creating gears. Cold rolled steel sheeting this material is manufactured by rerolling and cold reduction of hot rolled steel sheeting. This is a great resource for people who tend to misplace important documents, especially those that dont see much use. 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. Ms office documents are in downloadable, selfexecuting.
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. Laser welding is a noncontact process that allows metal parts to be assembled. Its rolling mills include automatic gauge control systems with hydraulic screw downs allowing for microsecond adjustments during processing. Chicago pneumatic represents tools and compressors that are engineered for high performance. Modeling, simulation and identification for control of tandem cold.
Cold rolling mills metal processing machinery american steel. This handy web application can help you save both time and effort as you browse the web to find a particular manual. Commercial plumbing maintenance and repair services. Hot rolling is performed above the recrystallization temperature of the alloy being processed. A specialized mill called a hobbing machine is programmed to cut gear teeth into blank stock. Pdf the tandem hot metal strip rolling process is a highly complex nonlinear. Since decades, chicago pneumatic has a heart for the general industry and matches your highest demands with the. In section 5, thickness control with roll eccentricity compensation has been proposed. During this process, the overall finish and granule structure of the material is is made more pure and workable.
This type of model is often called torqueforce model. The improvement in the quality of the final output depends on the control strategy of centerline thickness and interstand tension. 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. Close cooperation with all our technological departments ensures that projects can be executed exactly in line with your individual requirements at prime quality. 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. The weight of rolls may vary from a few kilograms up to 250 tonnes. Part of the advances in industrial control book series aic. Edge drop control technology of 4hi tandem cold rolling mill. 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. For this plant, synthesis is executed by the mfile dkit from the robust. Jul 18, 2014 cold rolling continuous mill steel strip single stand tandem reversing plate sheet. 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. 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. Electric tandem rolling mill continuous 700mm 5 stand carbon.
Modern metal cutting a practical handbook sandvik pdf. Taking the offline identified parameters as the initial values, online. New advanced control strategy for steel making process. 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. The place where all the equipment for metal rolling manufacture is set up is called a rolling mill. The ncmc, which replaced the old cold mill, housed an inline continuous pickler, which cleaned steel prior to rolling. Primetals technologies is your reliable partner with worldwide experience in the development and implementation of turnkey plants. Fifth octave chatter occurs in the frequency range of 550. Procedia engineering 207 2017 7984 2 xiawei feng et al. Identification and optimization for hydraulic roll gap. So that a continuous pass may be made through each one successively with change the direction of material.
Manualslib is a free, nosign up required library of product. Perfect for such an operation are sms group tandem cold mills our powerful flagships in the cold rolling sector. The tandem cold rolling of metal strip is one process in a sequence of processes performed to convert raw mate. Public informational meeting on the former sparrows point.
Finally identification of defects occurring during and its solutions. 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. 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. 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. Controlled rolling of a st523 steel at the laboratory mill tandem schindler i. Cold rolling continuous mill steel strip single stand tandem. 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. In addition to pioneering design, highimpact technology, and durability, chicago pneumatic means customer value. F amilies of stainless steel 9 10 medium and high crbased jfemh1 15cr1. Cold rolling mill rolling metalworking chemical elements. This representation followed the format given by equation 23.
Modeling, simulation and identification for control of tandem. Outstanding mill product quality has been achieved along with record breaking production. Computer controlled continuous tandem cold rolling mill. Industrial dosing dispensers are divided into two main groups. Cold forming cold working any mechanical operation that creates permanent deformation, such as bending, rolling, drawing, etc. 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. Simaan tandem cold metal rolling mill control addeddate 20625 15. The tandem cold rolling could be modeled as a strongly nonlinear. Special farm equipment retirement auction for mark lemke. Tandem cold rolling process is a nonlinear complex system with external and internal uncertainties and significant disturbances. Tandem cold metal rolling mill control using practical advanced. This phenomenon causes severe damage for the mill machine and strip quality fig.
Its primary function is to reduce the thickness of the steel to between 12 and 110th of its hotrolled gauge without first reheating it. Fundamentals of roll cooling and control of flatness at. Computation of rolling stand parameters by genetic algorithm 60 setting too. References background the demand for rolled products has increased tremendously in automobile, aircraft, food and other industries. 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. Optionally, its possible to arrange them inline as coupled pickling line tandem cold mills pltcm. The tandem rolling of cold metal strip is a large, highly complex nonlinear multivariable process. Original printed hours were not to betractor sells w4796 hrs.
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. 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. A continuous tandem mill has a welder and accumulator looper at the entry end to join successive coils of pickled hot rolled material. In order to improve the control performance of strip rolling mill, theoretical model of the hydraulic gap control hgc system was established. Stresses beyond yield strength of the workpiece material is required. 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. 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. An advanced 3d mathematical model for a 6high tandem. Fifth octave chatter occurs in the frequency range of 550 650 hz fifth octave from me 340 at mcmaster university. Tandem cold mill solutions from primetals technologies stand for high product yields combined with flexible production, low operational costs and simplified maintenance work.
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 rolling operations consist of two distinct phases. Tandem cold rolling process is a nonlinear complex system with external and. As a matter of fact, leonardo da vinci was credited for the metalworking mill prior to his death in 1519. Tandem cold metal rolling mill control springerlink. Its rolling mills include automatic gauge control systems with. Delivery of a solo swiss type profitherm p150 heat treatment line for the aviation industry in china. Cuttingedge coldrolling mills primetals technologies. Tandem cold metal rolling mill control deals primarily with a novel and.
A tandem cold rolling mill permits to reduce the thickness of a steel strip while ensuring the required mechanical properties. 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. Mathematical approaches are introduced for the understanding of load calculation in rolling processes. With expert teams committed to your success, we form a trusted partnership with each customer. Models metal wheels, wire grab irons, window glass, and plenty of weight. Our newsletter brings you the best of these finds, as well as helpful product tips and advice. After a short history of tandem cold rolling, various types of cold rolling processes. The tandem rolling of cold metal strip is a large, highly complex nonlinear multivariable process the control of which poses a significant engineering challenge. We can also provide total engineering, including auxiliary equipment such as utility facilities, inspection lines and roll shops.
Robust tension control of strip for 5stand tandem cold mills. This paper analyzes the rolling characteristics of tandem coldrolling process and proposes an innovative. 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. Computation of rolling stand parameters by genetic algorithm. After having passed through the cold rolling mill, the steel strip is hardened. Intermediate roll contour of 6hi ucm cold rolling mill. When most people think of a rolling mill, they visualize sizable machinery in ferrous iron, carbon steel.
Pdf a useful control model for tandem hot metal strip rolling. A typical five stand tandem cold rolling mill is illustrated in figure 1. So that a continuous pass may be made through each one successively with change the direction of. Drawings and general provisions of the contract, including general and supplementary conditions and division 01 specification sections, apply to this section. Front and schiller playground 32 12 16 asphalt paving. 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. 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.
Over 10 million scientific documents at your fingertips. Introduction modern steel strip cold rolling involves tandem mills consisting of typically five successive sixhigh 6 rolls stands with complex actuations. Development of simulation system of strip flatness for hot tandem mill, proceedings of the fourth baostee1. The results show that the rolling force is increased. This invention relates to a tandem rolling control system for controlling rolling speed in each stand of a hot or cold tandem rolling mill. Rolls are tools used in rolling mills to reduce the cross section of metal stock. 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. Depending on the product mix, the production capacity of continuous tandem mills from primetals technologies can exceed 1. Pdf tandem cold rolling mill modeling for multivariable control. Strip thickness control of cold rolling mill with roll.
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