Shape control of alloy steel rolled by sendzimir mill springerlink. A z mill or sendzimir mill is a machine for rolling steel. The cluster configuration transmits the roll separating force from the work rolls to the mill housing. Tadeusz sendzimir originally sedzimir, july 15, 1894, lwow september 1, 1989, jupiter, florida of ostoja coat of arms was a polish engineer and inventor of international renown with 120 patents in mining and metallurgy, 73 of which were awarded to him in the united states. Sendzimir s 20high mills are unique in that they have a small, chockless work roll and a cluster roll configuration supported by the backing assemblies. Improved shape control performance of a sendzimir mill using wavelet radial basis function network and fuzzy logic actuator jeon hyun park, jong shik kim, and seong ik han proceedings of the institution of mechanical engineers, part c. A static model of a sendzimir mill for use in shape.
In order to improve quarter waves occurred in the wide and thin gauged alloy steel rolled by 20high sendzimir mill, a computer simulation based on the divided element method and an actual cold rolling experiment were carried out. The object of shape control is to adjust the mill so that the rolled strip is free from internal stresses. The zhigh concept permits the revamping of a classical 4high mill with a system that uses amuch smaller work roll. Feb 05, 1974 planetary mill for producing scallopfree strip. Shape control systems for sendzimir steel mills citeseerx. The z mill is designed to make heavy reductions at high speeds and used to roll both ferrous and nonferrous metals. Numerical analysis of roll deflection for sendzimir mill article pdf available in journal of manufacturing science and engineering 1 february 2008 with 98 reads how we measure reads. This is brief introduction of cold rolling mill sendzimir mill. 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. The mechanical model of the work roll, first intermediate roll, second intermediate driven roll, and second intermediate idler roll was proposed and the contact force. Very hard and elastic materials can also be rolled by z mill. Zmill, sendzimir mill, cluster rolling mill waterbury farrel. Shape control of alloy steel rolled by sendzimir mill. Shape control systems for sendzimir steel mills ieee journals.
Issue 1 analysis of roll gap pressure in sendzimir mill by fem 33 i 4800 4000 3 200 6 2400 % 1600 i 800 a. A static model of a sendzimir mill for use in shape control. The control philosophy presented exploits this structure by diagonalising the system using an. Force model and elastic deformation analysis of 20high. Sendzimir mill rolls are generally used for rolling of stainless steel and nonferrous grades worldwide.
Cylindrical roller bearings for multiroll mill backup rolls. Optimal control of sendzimir mill 4 developing an optimum control system based on pontryagins maximum principle to get rid of the bottleneck to system response associated with the screwdown device, agc designed to ensure high accuracy without delay in control over a full range of rolling speeds has been realized. A 20high sendzimir mill is widely used in cold rolling. Feedback design of a canonical multivariable system with. The mechanical model of the work roll, first intermediate roll, second intermediate driven roll, and second intermediate idler roll was proposed and the contact force of each roll was calculated in. The acting force on the roll system of sendzimir mill was analyzed using 3d fem. Sendzimir mill, z mill, and cluster mills are one in the same. China 172007 600605 transactions of nonferrous metals society of china wwvv. The strip is accumulated to avoid unintentional standstill or operational stops, e. Sendzimir cold rolling mill pdf download absiograv. A cluster mill housing of substantially the same size and form as a comparable monobloc mill housing and applicable to 20high and 12high cluster mills, said mill housing comprising a floor portion, a roof portion and a pair of bridge members, said floor portion having a central portion with a lower roll cavity formed therein, said central portion terminating in oppositely.
The paper compares and contrasts various controller possibilities and is intended to provide a cookbook of shape control tools and strategies for sendzimir mills. Surface coating process where the workpiece is dipped into a bath of zinc and aluminum to form a surface. We support our customers operations stability not only with cylindrical roller bear. It may help in planning the maintenance operation of rolls and bearings and in reducing the service costs. Analysis of rolls deflection of sendzimir mill by 3d fem sciencedirect. The deflection of rolls of sendzimir mill with double asuroll was simulated by finite element methodfem. The influences of rolling pressure, strip width 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. Sendzimir mill with double asuroll systems was developed in 1991, which had more power to control the strip flatness than that using the sendzimir mill with single asuroll system. In addition, the sendzimir mill is a reversing mill, with shape measurement devices at either end of the mill, providing a facility for feedforward of incoming shape. A numerical simulator developed in the matlabsimulink. Quarter waves were simulated by elastic deformation analysis of rolls considering bending deformation of back up rolls and the effect of control actuators on. Founded in the early 1950s by the polish inventor, tadeusz sendzimir born 1894, the business started in association with armco as the armzen company. Apr 29, 2016 from sendzimir 20high cluster mills, to zhigh retrofits, t. This paper presents a completely new approach to the mechanics of the sendzimir hot planetary rolling mill. This mill combines the advantages of existing cluster mills heavier reductions per pass and between anneals with the advantages of fourhigh mills easier to. Instead of using multistand four high rolls sendzimir s mill used a clustered nest of rolls, like two inverted pyramids 1234 configuration. In addition, the sendzimir mill is a reversing mill, with shape measurement devices at either end of the mill, providing a. 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. The subject of this thesis is the static model of the sendzimir cold rolling mill, which is a 1234 type cluster mill.
And now, its connected to the adobe document cloud. Analysis of rolls deflection of sendzimir mill by 3d fem. With the processline zhigh mill, whether in single or multiple stands, no upstream equipment is required other than superficial surface cleaning brushes and like equipment. A cluster mill housing applicable to 20high and 12high cluster mills. In this article, the authors investigate the dynamic behaviour of a sendzimir mill. The roll gap pressure distribution and the acting force between rolls s and o, rolls o and i, rolls o and j, rolls. Sendzimir 20 high mill and sendzimir zhigh mill bring these advanced technologies to modern manufacturing facilities. Both static and dynamic models of the mill are required for the control system design. Such mills, with a variety of shape actuators, offer the. A basic understanding of the mechanics of rolling mill rolls file. Extensive experience in the area has led to the perfecting of these hydraulicallyloaded, gaugecontrolled mills for a variety of applications. Sendzimir s rolling process departed dramatically from the multistand continuous process developed by john tytus armco 1924. As is known, sendzimir coldrolling mills feature several roll arrangements, a typical one of which is the 1234 arrangement illustrated in fig.
Tovini, included determinations for the distribution of the advance of the strip, the draft, the rolling load, the torque and the horizontal backthrust for the whole range of positions which the planetary rolls made, whilst contacting. Issue 1 analysis of roll gap pressure in sendzimir mill by fem 33 i 4800 4000 3 200 6 2400 % 1600 i 800 a 800 600 400 200 0 between roll b and roll i \ pa pc component force pd. Vibration analysis of sendzimir cold rolling mill and. A cluster type rolling mill intended to provide work roll sizes in the range between the small sizes available with current cluster mill designs and the large sizes available with current fourhigh mill designs is disclosed.
Shape control in sendzimir mills using both crown and intermediate roll actuators. This allows the application of a higher roll pressure without bending the work rolls, which would result in poor metal quality. The plant transfer function matrix, however, has the special form. The shape control problem, for a sendzimir cold rolling mill, is multivariable. Index termseigenfunctions, eigenvalues, metal industry, multivariable systems, robustness, sendzimir mill, shape control, singular value decomposition. Rolling mill technology and machine design sendzimir. The rolling of hot steel slabs using a sendzimir mill requires a much smaller operational area than a continuous hot strip mill. Sendzimir s zhigh mill is the only design capable of reducing incoming stainless steel hot band to coldroll gauges in a single pass in a process line. Buy, sell and rebuild secondhand steel mill equipment worldwide. Analysis of roll gap pressure in sendzimir mill by fem. Its the only pdf viewer that can open and interact with all types of pdf content, including. Vibration analysis of a sendzimir cold rolling mill and. The mill housing is similar in size and form to a comparable monobloc housing but is made of four distinct parts. At such high speed, it is very necessary that the material of sendzimir mill rolls is clean and free from inclusions and defects.
Sendzimir zhigh mills were developed to combine the advantages of the sendzimir clustertype rolling mill with those of the 4high. The static model derived enables shape profiles to be calculated for a given set of. Numerical analysis of roll deflection for sendzimir mill. Sendzimir mill rolls operate at a speed ranging from 500 mpm to mpm. A wide variety of sendzimir mill options are available to you, there are 438 suppliers who sells sendzimir mill on, mainly located in asia. Quarter waves were simulated by elastic deformation analysis of rolls considering bending deformation of back up rolls and the effect. Specializing in hot and cold rolling mills for producing flat and long products. Pdf shape control systems for sendzimir steel mills researchgate. Improved shape control performance of a sendzimir mill using. The top countries of suppliers are china, south korea, from which the percentage of sendzimir mill supply is 99%, 1% respectively. Improved shape control performance of a sendzimir mill. A planetary mill for rolling flat articles, comprising a mill housing, at least one backing roll mounted in said housing, and having a number of planetary work rolls orbiting around it, and a cam arranged to contact the major part of the face of the work. Sendzimir mill article about sendzimir mill by the free. Pdf shape control in sendzimir mills using both crown and.
Pdf shape control systems for sendzimir steel mills. The process guarantees high resistance and durability characteristics. Shape control systems for sendzimir steel mills core. Numerical analysis of strip edge drop for sendzimir mill. The first product lines were for hotdipped galvanizing lines, for which the companys founder was the inventor and patent holder. The other major new facilities coming up at the salem steel plant include electric arc furnace, ladle furnace, aod convertor, slab caster and a new sendzimir mill.
Contact casey equipment for a quote on used sendzimir millsz mills for sale. From sendzimir 20high cluster mills, to zhigh retrofits, t. Sendzimir rolling mill adjustment filed july 16, 19. Journal of mechanical engineering science 2014 229. 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. Fag bearings in a sendzimir mill examples of application engineering publ. Deals with the problem of shape or flatness control for sendzimir 20 roll coldrolling steel mills. Improvement of shape recognition performance of sendzimir mill. Sejal is in charge of the engineering, delivery and commissioning of sendzimir mills invented by dr. Adobe acrobat reader dc software is the free global standard for reliably viewing, printing, and commenting on pdf documents. The zs sheet mill also known as the type 12 mill utilizes two driven work rolls and four backing bearing assemblies enclosed in the rigid and compact sendzimir housing. However, any research works on analyzing the strip edge drop for sendzimir mill with double asuroll systems has not been found.
High rigidity twentyhigh sendzimir mills zrms are widely used for rolling stainless steels, silicon sheets, etc. Extensive experience in the area has led to the perfecting of these hydraulicallyloaded, gaugecontrolled mills for a. Pdf numerical analysis of roll deflection for sendzimir mill. Numerical analysis of strip edge drop for sendzimir mill article in journal of materials processing technology 208. Our innovative staff of engineers and designers have considerable depth of experience in solving some of our customers most perplexing problems. The deformation of rolls within the roll system as a whole is analyzed without pinpointing upon each roll and impact on the rolling process. Zmill, sendzimir mill, cluster rolling mill waterbury. A cluster type configuration of 20 rolls enables to use smaller size work rolls, that allow high reduction rolling of hard metals and the production of thinner gauge strips. This milling process is not recommended for heavy duty running surfaces such as crane rail. Rolling mill strip wipers allegheny ludlum corporation. It is primarily used as a mill for rolling sheets, producing material with a superior gauge tolerance to that obtained on conventional mills. A complete dynamic analysis of the cluster mill layout has seldom been proposed in the literature. Oct 10, 2017 the z mill is designed to make heavy reductions at high speeds and used to roll both ferrous and nonferrous metals. The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows 1.
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