Width entry 340mm thickness, entry 3,5mm thickness, exit 0,05mm coil weight 2. Sendzimir mills supplied by sejal have been in operation in a number of countries in. On this page youll find the hot rolling mill patent us4248073 cluster type cold rolling mill. Advances in cold rolling technology t sendzimir inc. New adaptive control functions were installed figure 2. Innocenti new mid1960s built under license from sendzimir model. Feasibility study for cold rolling project in eastern cape.
Influence of microstructure on the premature failure of a. On the early mills of the 1950s, crown adjustment was provided on shafts d by manually rotating adjustment nuts located just above the mill window. Mill edge slit edge remarks is a natural mill edge carried through the cold rolling without additional processing of the edge. Salem steel plant salem steckel mill crop shear optimization 1 no. Stresses from hertzian pressure in 4high cold mill back up rolls were measured. Sealed type backing roll bearings for sendzimir cold strip mill 10. The sendzimir manual is based on the reallife experiences of our top mill technicians. Somentor a series is suitable for use on all mill configurations including 4 himills through to 20 multiroll mills. Just a few years later, the first alligatortype 20high rolling mill was built, followed in 1958 by the first 20high rolling mill in sundwig four column sfc design. Specialty metals production national energy technology. Electrical room of pl, electrical room of rolling mill incl.
What links here related changes upload file special pages permanent link page. About 75% of hydrogen was needed in the original sendzimir process but all the newer nonoxidizing methods of degreasing require. Rolling mill technology and machine design sendzimir. Cold rolling reversing mills sendzimir mill z mill small diameter work rolls surrounded by larger backup rolls coiling stands provide tension large reductions possible on strong materials active shape and gauge control material can be produced as wide as 60 and as thin as 0. Over 60 years of experience in hot and cold rolling mills for carbon, stainless steel, and nonferrous rolling mills.
Our precision cold rolling mills have name brand recognition worldwide for gauge accuracy, flatness of strip shape, and ultrathin gauge. Sendzimir rolling mill technology and machine design. Unlike a traditional rolling mill this 20high cluster mill configuration utilizes cascaded supporting rolls to apply force on the small work rolls in the center. Advances in cold rolling technology sendzimir zhigh cold rolling mills in the 1980s michael g. Increasing the efficiency of metalform tooling for.
The sendzmir mill casey has for sale is a very heavy duty fast sendzimir mill, z mill, cluster mill, and is capable of holding very close tolerances. Hot rolling mills usually comprise the following process steps. Mutual difference of assembly thickness for bearings mounted on same shaft is controlled to. Sendzimir, 1985 introduction at the beginning of 1985, the steel and nonferrous industries found themselves in a bind they were faced with low consumption, shrinking markets, higher costs, increased quality demands, and lower prices. Forged rolls for cold rolling metal division prealpi d. It allows the application of a higher roll pressure without bending the work rolls, which would result in poor metal quality. For these units a closed loop flatness control system was supplied by the mill builder i2s. We work on field of forged rolls for cold rolling mills and straightening of sheets metal, steel strips and nonferrous metals.
The longterm thickness quality trend in cold rolling mill sendzimir 231 at avestasheffield precision strip. Shape control systems for sendzimir steel mills citeseerx. The diameter of the 6high work rolls amounts to approximately 1. The automatic gauge control agc systems and hydraulic. Sendzimir mill characteristics cold rolling mill hani tech. The history of the sundwig 20high rolling mill begins in the first half of the last century, when sundwig developed a multiroll cold rolling mill in 1930. Contact casey equipment for a quote on used sendzimir millsz mills for sale.
Hot rolling mill walking beam furnace roughing mill steckel mill and tandem mill bell furnaces cold rolling plant annealing and pickling line sendzimir mills annealing and pickling line polishing line slitting and cuttolenght lines coils and sheets rapline contious rollingannealingpickling line logistics coils and sheets transportation. Sendzimir, sendzimir mills and their rolls, 31st mechanical working and steel processing conference proceedings, vol xxvii, the iron and steel society, 1990, p 329334. Roll forging pdf the liquid metal into slabs, billets or blooms. The mill also has sendzimir flexible shaft backing. Figure 19 252 element model results for 20high sendzimir cluster mill 59. Optimization of a cold rolling mill thermo fisher scientific. Hitachi has developed hss rolls for sendzimirmill from the 1950s, and has supplied many small hss rolls to the sendzimirmill.
A four high mill, on the other hand of the same 72 inch width, would have a minimum work roll diameter of about 20 inches. The essential difference between sendzimir mill sendzimir cold rolling mill and other types of the mill is the direction of rolling force transmission. Constant velocity joint bc coupling type, long shaft series10. This allows the application of a higher roll pressure without bending the work rolls, which would result in poor metal quality. Refer to the tapered roller bearing guide or to your timken. The static model derived enables shape profiles to be calculated for a given set of. 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. Download hot rolling mill defects, open and convert a come to juhuj to download millions of free pdf files.
The zmill uses cascaded supporting rolls instead of using a single pair of rolls to apply force on the small work rolls in the center. Cold rotary forging is an innovative incremental metal forming process. Automatic flatness or shape control automatic gauge control coilers controls and automation. Twenty rolls reversible sendzimir cold rolling mill payoff max.
The functions of asu and lateral shifting of intermediate roll result in the achievement of accurate shape control. Cold rolling reversible 4high cold mill between two coilers. The rolling force of sendzimir mill is transferred from the working roll through the intermediate roll to the supporting roll device and eventually to the solid overall stand. The cluster configuration transmits the roll separating force from the work rolls to the mill housing. Cold rolling mills yogijidigi can be your preferred supplier for cold rolling mills starting from planning, engineering, implementation and modernization of your plant. Four high cold roll mill three in line, initial cold rolling of hot rolled strip to t 0. Keywords sendzimir steel mills, predictive functional control, shape.
Scriven, sendzimir mills for cold rolling in bsc stainless,flat rolling a comparison of rolling mill types, the metals society, 1979, p 163169 6. Sendzimir type 20hi reversing cold rolling mill skoda model vd1637x400 previously used for stainless steel year of manufacture 1985 minmax strip width 150 340mm max. Is an approximately square edge produced by slitting without any further treatment on the edge range of sizes mm available coil id. Coldrolled stainlesssteel strip can be produced efficiently by highspeed rolling in a clustertype rolling mill with smalldiameter work rolls, or in a tandem coldrolling mill with large. Bhilai steel plant, bhilai digital drives for roller table 2sets, 750 amps, 250 volts, thyristor. The shape control problem for a sendzimir 20rol1 cold rolling steel mill is characterised by operation over a wide range. 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. Sendzimir coldrolling mill the most advanced coldrolling mill in the world equiped with agc afc, its products have high accuracy, excellent flatness and small thickness tolerance.
The process guarantees high resistance and durability characteristics. Zmill, sendzimir mill, cluster rolling mill waterbury. A new methodology to analyse iron fines during steel cold. The main building of the cold rolling plant is arranged nearby the south of the battery limit. Hptr mills, unlike other type tube mills, take advantage of the proven sendzimir cold strip mill principle which uses multiple small size rollers to cold roll thin metal sheets. A basic understanding of the mechanics of rolling mill rolls file. Cold rolling mill facility for steel coil and sheet. Holohan control systems group school ofelectronic engineering dublin city university glasnevin, dublin 9, ireland abstract. Shape control options on the sendzimir cluster type mill figure 2 shows the upper cluster of a typical sendzimir cluster mill. Intermediate annealing is frequently needed to achieve large cold rolling reductions. A zmill or sendzimir mill is a machine for rolling steel. A static model of a sendzimir mill for use in shape control. Numerical analysis of strip edge drop for sendzimir mill.
Sendzimirs 20high mills are unique in that they have a small, chockless work roll and a cluster roll configuration supported by the backing assemblies. Hence a major drawback is the risk associated with the deflection of smaller rolls from original position figure at bottom. Pdf predictive functionnal control of a sendzimir cold rolling mill. The rolling process is generally characterised by a large number of influencing parameters like characteristics of actuators, temperatures and the thermal roll growth to just mention a few of them. Four high rolling mill two main smaller rolls supported by two back up rolls. Extensive experience in the area has led to the perfecting of these hydraulicallyloaded, gaugecontrolled mills for a variety of applications. Sendzimir mill, z mill, and cluster mills are one in the same. 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.
A very large number and high value of spares is included wi. Rich experience and long tradition in producing high quality steel products, constant development and heat treatment of our forged rolls, provide a high quality of our products to satisfied any customers requirements. Sendzimir process named after tadeusz sendzimir is used to galvanize a steel strip by using a small amount of aluminum in the zinc bath and producing a coating with essentially no ironzinc alloy. Somentor a series products are suitable for the lubrication of back up bearings in multihi mills.
Robust shape control in a sendzimir coldrolling steel mill. Pdf this paper presents the implemtation of a predictive functional controller for the sendzimir. Backing roll bearings for sendzimir cold strip mill because it is directly used for backup roll, the bearing is stronger and has a thicker outer ring. Sendzimir mills are famous for their ability to realize efficient rolling result by the high rigid mill housing with small diameter work rolls. In comparison to a 4high mill stand, the utilization range is wider. Moreover, cold rolling is the key process for the thin strip edgedrop control, and a sendzimir mill is one of the most popular cold rolling mills for silicon strips. This type of rolling mill is mainly used in offline applications for cold rolling of soft and medium strip and for a wide range.
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