It is employed to convert metal ingots to simple stock members like blooms, billets, slabs, sheets, plates, strips etc. The integration skills of primetals technologies and our broad base of engineering disciplines, from machine design through process control and metrology, make us an ideal partner in the maintenance and development of the plate mill as a lasting asset. Strip thickness control of cold rolling mill with roll. The process of shaping metals into semifinished or finished forms by passing between rollers is called rolling. The rolls are equipped with bearings and mounted in a stand with a screwdown mechanism. Rolling is a metal forming process in which metal is passed through a pair of rotating. The stable and reliable rolling of thin strip in the finishing mill of linked casting and rolling processes such as arvedi esp endless strip production and compact strip production csp, or in conventional hotstrip mills, has increased the requirements for precise massflow and thickness control. In section 5, thickness control with roll eccentricity compensation has been proposed. So take a deep breath, release it, and remember knowledge is power. Pdf there are various reasons by which the damage in the cold rolling. In the conventional hot strip mills the minimum strip thickness rolled was 1,5 2 mm.
Rolling mills have many different designs and may be standalone pieces of equipment used for processing plate or ingot, or incorporated into full processing lines used for coiltocoil processing. The video shows the manufacturing process of tmt bars in india. Many shapes and sections are possible to roll by the steel rolling process. In section 4, architecture and learning algorithm fuzzy neural networkof have been presented. Rolling is classified according to the temperature of the metal rolled. It is the most widely used forming process, which provides high production and close control of final product. The place where all the equipment for metal rolling manufacture is set up is called a rolling mill. Saswata baksi manufacturing technology leave a comment.
With the help of rolling conveyor, the billets are made to pass through roughing stand. Cold rolling mills yogijidigi can be your preferred supplier for cold rolling mills starting from planning, engineering, implementation and modernization of your plant. Rolling the process of plastically deforming metals by passing it between rolls is known as rolling. So first rolling is done in roughing mill then it is sent to finishing mill. Understanding the details of this process will give you the ability to control your results and allow you to create whatever youre envisioning.
Definition, working, application, defects, type of rolling mills pdf. More than 95% of ferrous and nonferrous metals and alloys are processed to their usable shapes by rolling. Each stand has vertically stacked rolls that are powered by huge motors to impart high compressive stresses into the strip. The primary function of a rolling mill is to reheat semifinished steel billet ingot nearly to their melting point, then roll them thinner and longer through successive rolling mill stands driven by motors sample layout. In the past it used to take weeks to produce coiled strip from iron ore. The strip from the hot rolling mill is coiled for transport to the cold mill which might be on the same site or elsewhere. Pdf modelling and control of a hot rolling mill researchgate. The finally selected layout was to employ onestrand rolling mills for the second intermediate rolling mill on each of the four strands to re duce the influence of. Regarding hot rolling of steel, the quality of the rolled metal surfaces depends to a large extent on effective descaling. Rolls or rolling mills is a cylindrical shape of roll used in rolling process. If the temperature of the metal is below its recrystallization temperature, the process is termed as cold rolling. Plate mill power meets precision primetals technologies. Ppt rolling mill powerpoint presentation free to view. 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.
A typical rolling mill consists of a pair of rolls driven by an electric motor transmitting a torque through a gear and pair of cardans. In metalworking, rolling is a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness and to make the thickness uniform. There are two types of rolling process flat and profile rolling. The abb awardwinning distributed control system dcs product families can be scaled to meet different customer needs from plc functionality up to highend rolling mill controller including technological controls, mathematical models and simulation packages, full integration of process, electrical and safety to achieve greater results with fewer resources. The material is subjected to high compressive stresses from the squeezing action of the rolls and to surface shear stresses as a. Rolling mills often vary in the type, number, and position of rolls. Colton 2 overview process equipment products mechanical analysis. Ongoing process optimisation the process control systems and process models from sms meer help plant owners optimise their processes, quality and productivity. A free powerpoint ppt presentation displayed as a flash slide show on id. We hope the following information is helpful and you will learn more about how some tube manufacturing occurs. If the temperature of the metal is above its recrystallization temperature, then the process is termed as hot rolling.
Report on best available techniques bat in the german. Overview of the steelmaking process pellets sinter limestone. In india now a days mostly 20 hi and 4 hi rolling mills are installed in bi g steel produ ction units. In flat rolling the final shape of the product is either. If you have any questions or good suggestions on our products and site, or if you want to know more information about our products, please write them and send to us, we will contact you within one business day.
Following roughing mill, the size is further reduced in intermediate and finishing mill. Not all steel plants produce all of the products shown in this diagram. In thinslab continuouscast rolling mills the strip rolled thickness is below 1 mm and the strip caster aims to cast between 2 and 1 mm. It is one of a metal forming process in which the metal work piece is compressed between a set of rolls where it reduces its cross section area and increases its length. It is done by passing the strip of the metal between the rollers. This process was successfully achieved in recent times with backup rolls for hot strip mills, by changing the steel grade from 2% chromium to 5 % at a significantly. At one point during the industrial revolution in america, the united states led the world in hot and cold rolling, plate mills, slabbing mills and blooming mills.
Rolling mills are not a standard machine tool, nor are they built for stock. In order to avoid surface damage, iron oxide scale layers are therefore removed from the hot steel surface by highpressure water spraying prior to the actual hot rolling process. Rolling is the most important metal forming process. Cold rolling is accomplished by processing steel strip through a series of tandem rolling mill stands. Rolling of metal cooperative patent classification.
Rolling mill element machinery supplies rolling mill. This process uses a piercing mill, which is a skew rolling mill for piercing in cylindrical billets. Cold mills, in a wide range of types and sizes are available. In section 3, a mathematical model has been driven for singlestand cold rolling mill. In a metal rolling process, rolls, stands, bearings, housing, motors, and other mechanical equipment are all a necessary part of the manufacturing operation. The potential of the modular approach is wideranging too. Hotrolled, pickled coils are fed into the cold rolling mill. The hot rolling process reheating furnaces heated up to 1200 1250 c for steel, 500 550 c for aluminum removing cast dendrite structures dissolving most of alloying elements decreases hard precipitates roughing mill coil box finishing mill figure is. Leonardo da vinci invented the first rolling mills but only after a few centuries rolling mills became important for the.
Working, application, defects, type of rolling mills. The cold rolling process is carried out at low recrystallization temperature and it produces relevant small and thin pieces and temperature is low, therefore deformation becomes relatively difficult than the hot rolling process. Acknowledgements thismanualhasbeenpreparedwithinformationandassistance fromthealuminumassociationandmembercompaniesrepresented onthesheetandplatedivision. This begins the process of gradual size reduction of billets. Progress of bar and wire rod rolling process, and improvement of. Tracey johnson founder and prior owner of rolling mill resource understanding the process. A machine used for rolling metal is called rolling mill. The rolling mills complex was proposed to include a light and medium merchant mill with breakdown group of stands for rolling blooms into billets and an intermediate inline heat compensating furnace. The housing and set of rollers mounted on the machine is known as stand. Rolling is a major manufacturing process of sheets and other cross sections of large length like i beam, railroads etc. It has come to our attention that some people who contact this website may not be familiar with the pilger mill manufacturing process. In this article, youll learn what is rolling mill and how it works and types of rolling mills. Rolling is the most widely used metal forming process. Salzgitter the process shown above is illustrative only and is not designed to show the steelmaking process in detail.
To ensure outgoing material gauge meets a required dimensional tolerance, a rolling mill typically has very accurate positioning feedback. Hot rolling practice an attempted recollection saral dutta. Rolling is one of the oldest process for reducing the cross section of. While rotating the billet with a pair of skew rolls, the piercing mill presses the billet against a plug. Two high rolling mill rolling is a bulk deformation process in which the thickness of the work is reduced by compressive forces exerted by two opposing rolls. They are designed and builttoorder to specifically accomplish an end product or process. In the rolling process, the job is drawn through a set of. Rolling of metal auxiliary operations used in connection. Abb process control solutions for metals plants abb. The stands, and rotary rolls, are the machines that make. This paper discussion will be made about the rolling process, the working principle of the rolling process along with that the working principle of the rolling mills. Ugi engineering works private limited is one of the most prestigious manufacturer, exporter, supplier, and consultant of high grade hot rolling mill. The typical mannesmann rolling process is schematically shown in fig.
667 550 801 440 140 346 1450 430 1355 1518 1001 274 129 1382 510 235 144 1484 1340 539 1533 437 1047 801 669 701 1125 536 702 884 1485 456 618 683 1124 724 229