Types of rolling 12 some of the steel products made in a rolling mill. Rolling can be classified as hot rolling or cold rolling. Since not being continuous rolling, the reversing cold rolling mill. The main building of the cold rolling plant is arranged nearby the south of the battery limit.
A rolling simulator for the cluster mill, especially the 6hi x and 10hi x type mills besides the conventional 4high mill, has been developed for evaluation of rolling thin strips and foils. In india now a days mostly 20 hi and 4 hi rolling mills are installed in bi g steel produ ction units. Report on best available techniques bat in the german ferrous metals processing industry final draft deutschfranzosisches institut fur umweltforschung dfiu frenchgerman institute for environmental research university of karlsruhe th o. Cold rolling mills the evolution of rolling mills has accelerated as the speed of processors and digital controls have grown by orders of magnitude. Agc hydraulic 6 hi cold rolling mill 700mm carbon steel 390m min speed. A complete modernization of the 5stand tandem cold reduction mill was completed in 1997. Process references are optimized to provide power, force and tension distributions between the stands to produce a quality product. Longstanding experience as a leading supplier of cold rolling mills as a lifecycle partner for cold rolling mills, primetals technologies offers complete solutions and support packages for cold rolling mills that extend from the initial investment idea, to mill planning, layout, engineering and construction, up to turnkey plant installations and fullscale plant modernizations. Cold rolling shape defects of stainless steel wide strips. Operation of rolling mills schweitzer rolling technology. The cold mill produces steel and stainless steel and is also used for aluminum, aluminum foil, and copper.
The aim of the mill is to process the coils obtained in the hot rolling mill, also automated by ingeteam industry. Pdf life of rolls in a cold rolling mill in a steel plant. Davy mckee manufacturer davymckee new 1989 type of mill. The evaluation includes roll deflection, pressure of rolls in contact, roll exit thickness distribution, and so on. Report on best available techniques bat in the german. If you continue browsing the site, you agree to the use of cookies on this website. Sms group cold rolling mills 8 cvc plus 6hs reversing cold mill for steel foils wickeder westfalenstahl gmbh in wickederuhr, germany, is a cold strip producer specializing in highquality prod ucts. The cold rolling mill responsible for the stainless steel differs from the carbon steels being called cluster mill 20 high or sendzimir 12 high, in single stand configuration, being constituted by monolithic stands, compact, multirolls, for material with a hardening level bigger than carbon steels.
Apr 28, 2015 thus, it was desired to develop a new type of mill which is capable of controlling the rolled strip shape even with changes in rolling conditions. Hot rolled coil that are cleaned at the pickling line hrp, is being processed at the cold rolling mill total 700,000 tons annual capacity to reduce the thickness to desired values. The torque is equal to the product of total rolling load and the effective moment arm. Hot rolling is used to convert ingots to blooms and blooms to billets to slabs to plates, billets to bars, billets to structural shapes. In section 3, a mathematical model has been driven for singlestand cold rolling mill. The capital cost in a rolling mill is substantial and investors understand that in order to achieve the maximum roi and shortest. Featuring rolling and processing primetals technologies.
Cold rolling mill is wire rod rolling into a threaded rod or wire. Optimization of cold rolling mill process to improve. Hot rolling is carried out above rct and cold rolling is carried out below rct. Cold mill setup csu cold mill setup calculates process regulator references and gains for rolling a specific product. 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. In case of stainless steel, the process is more complex, with previous stages passing through a previous heat treatment of the coils, in bell furnaces, after the hot rolling process, reaching cold rolling mills with input thicknesses between 2.
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. If a works with a rolling mill is known as a foundry, then the word is being used loosely that is to say it is. Single stand 4hi cold mill hand of mill right to left material. A cold mill rolls coils of pickled steel from the pickle line at ambient temperature, using coolant oil. The two deformation values combine to form the mill stretch which is added to. As a controller for a rolling mill thickness control which exploits the. Each stand has vertically stacked rolls that are powered by huge motors to impart high compressive stresses into the strip. Cold rolling fundamentals a practical training seminar. Cold rolled coil hot rolling mill continuous annealing line pickling line electrolytic cleaning line annealing furnace temper rolling mill recoiling line. Pdf there are various reasons by which the damage in the cold rolling mill rolls occurs.
The main conveying system is with v belt which can make sure equal force, creditable and stable function. Multiroll cold rolling mills are used to process high grade steel strip and nonferrous metal strip. Effects of rolling parameters on the shape of cold rolled strip. In section 5, thickness control with roll eccentricity compensation has been proposed. Depending on the product mix and quality demands, primetals technologies offers 6high or 4high mill stands to meet the respective product. Pires et al 2006 2 has applied nonlinear simplex optimization method for cold rolling mill process parameters which reports good results. Cold rollingis a rolling operation carried out at room temperature. The number 2 rolls on this cold rolling mill are made of chilled material. The direct consequences are a loss of material, a waste of time, and a lot. Hardened temper rolling mill four roller for carbon steel high elasticity.
The rest of this section gives a summary of roll materials and indicates how to estimate the loads which the rolls must withstand. The twinstand aluminum cold rolling mill under consideration is shown. These references include speeds, tensions, forces and thickness settings. Here, each gauge was zeroed by manual adjustment of a variable resistor. A new 6high cold rolling mill hereinafter hcmill has been developed in order to solve these shape problems.
Cold rolling mill on sales quality cold rolling mill. Development of cluster mill simulator for thin strip and foil. The main conveying system is with v belt which can m ld40 series threeroller cold pilger mill 1. Development of cluster mill simulator for thin strip and. You benefit from our 20high mills because they are packed with stateoftheart mechanics, hydraulics, electrics, and automation. Tandem mills can be either of hot or cold rolling mill types. New rolling method of reversing cold rolling mill steel plantech. If a works with a rolling mill is known as a foundry, then the word is being used loosely that is to say it is being misued. A state of the art steel mill to produce the worlds thinnest and widest stainlesssteel coils to reduce production costs and meet increasing demand for ultrathin stainless steel, one of italys largest steel producers sought to have a new 20high cold rolling mill, the first in the. The output from a strip mill is coiled and, subsequently, used as the feed for a cold rolling mill or used directly by fabricators.
Feb 10, 2012 crm complex6 high reversible cold rolling mill training manual0 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. In order to prevent whipping of the work rolls, they are supported by means of intermediate. Cold rolling mills yogijidigi can be your preferred supplier for cold rolling mills starting from planning, engineering, implementation and modernization of your plant. Crm complex6 high reversible cold rolling mill training manual0 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. With the growing demand for quality galvanized and cold rolled steel products, coupled with the high quality needs of our customers for strip gauge accuracy, flatness, and enhanced surface quality, csi recognized the need to increase cold reduction capabilities. Thus, it was desired to develop a new type of mill which is capable of controlling the rolled strip shape even with changes in rolling conditions. Outline of reversing cold rolling mill and rolling method as illustrated in figure 1, a reversing cold rolling mill is structured mainly of a mill proper, a winding machine payoff ree l, an entry winding machine tension reel and a deliverywinding machine tension reel.
Abstractwhen cold rolling stainless steel wide strips, some flatness defects can occur. Different types of flatness defects encountered during cold rolling. A new 6high cold rolling mill hereinafter hc mill has been developed in order to solve these shape problems. Refer to the tapered roller bearing guide or to your timken. The automatic gauge control agc systems and hydraulic. This unit now has a capacity of more than 1 million tons annually. Optimization of a cold rolling mill thermo fisher scientific. Cold rolling is commonly conducted after hot rolling when good surface quality and low thickness tolerance are needed. The 2hi cold rolling mill is a kind of portable type. Used 1250mm 12hi reversible cold rolling mill,1set of single stand cold rolling mill and 2 sets of double stands cold rolling mill. The course covers fundamentals, equipment, rolling theory, control, threading, rolls, lubrication, measurement, safety and new technology. Application of comprehensive agc system for aluminum. Learn more lg80 tworoller cold pilger mill the features of lg80 tworoller cold pilger mill.
Cold rolling mill on sales quality cold rolling mill supplier. Advanced reversing coldmill technology from primetals technologies is an ideal solution for small to mediumsized production capacities, or for the rolling of smaller order lots of special steel grades. Longstanding experience as a leading supplier of coldrolling mills as a lifecycle partner for coldrolling mills, primetals technologies offers complete solutions and support packages for coldrolling mills that extend from the initial investment idea, to mill planning, layout, engineering and construction, up to turnkey plant installations and fullscale plant. 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. One of its key products is highstrength cold strip for the automotive industry. Aluminum cold rolling is a rolling process to reduce the thickness with a further. Advanced reversing cold mill technology from primetals technologies is an ideal solution for small to mediumsized production capacities, or for the rolling of smaller order lots of special steel grades. Aluminum 3004 and 5017 alloys mill rolling load design 1,500 u. In section 4, architecture and learning algorithm fuzzy neural networkof have been presented. Rigid 20 high cold rolling mill machinery, high precision stainless steel rolling mill. Billets, for rerolling, are subsequently rolled in either a merchant, bar or rod mill.
Feasibility study for cold rolling project in eastern cape. A basic understanding of the mechanics of rolling mill rolls file. 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. Cold rolling is accomplished by processing steel strip through a series of tandem rolling mill stands. Due to different numbers of rollers, the metal coil cold rolling mill is divided into 2 hi, 4 hi, 6 hi, and 12 hi agc. While the surface of the coldrolled ribbed steel bars. This seminar provides a comprehensive overview of cold rolling.
Single and multistand mills cluster and sendzimir mills inline and continuous rolling mills reversing and nonreversing reduction, skinpass, double cold reduction dcr and foil rolling steel, stainless, aluminium, copper and brass for a wide range of end products. Cold rolled steel sheets and coils are extensively used as basic materials. The performance of a conventional 4high mill is not satisfactory in these requirements. Arvedi esp endless strip production technology, featuring the direct linking of a slab caster and hot rolling mill in a continuous, uninterrupted production line, is providing new impulses for the flatsteel market. 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. In concrete, the coldrolled ribbed steel bars and concrete surface friction and adhesion increased significantly. It consists of a quarto mill stand two working rolls and two backup rolls, coiler and uncolier. In the cold rolling process, pickled and oiled coils pass through five stands, arranged in tandem with a predetermined amount of reduction taken on each stand until the final thickness is. Hotrolled, pickled coils are fed into the cold rolling mill from an entry. Electrical room of pl, electrical room of rolling mill incl. A flat strip means that when lying on a flat horizontal surface the strip touches the surface at every point. Flatness defects cause shifting, strip breakage, and axial forces. Tworoller cold pilger mill on sales quality tworoller.
In addition it suggests what mill size is most suitable for given ranges of products so as to ensure reasonable ef. Attendees will leave this course with a better understanding of the basic metallurgy involved, the different types of products and product attributes, the types of mills used and. 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. Merchant or bar mills produce a variety of shaped products such as angles, channels, beams, rounds long or coiled and.
Strip thickness control of cold rolling mill with roll. The homogeneous thickness and high surface quality is maintained at 6 hi reversing mill with the help of afc and agc systems. Multiroll cold mill stands are described using different terms depending on their type and manufacturer. Advantages of cold rolling mill cold rolled ribbed steel surface has two or three side faces transverse ribs. 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.
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