Automation for shape control in stainless cold rolling mill. Inventor tadeusz sendzimir, a polish immigrant, designed and installed the first z mill for cold rolling stainless steel in the united states. Sendzimir mill characteristics cold rolling mill hani tech. Report on best available techniques bat in the german. Improved shape control performance of a sendzimir mill using. Analysis of vibration for sendzimir mill in cold rolling of.
Thus, the mastery of edgedrop control behavior for silicon strip cold rolling with a sendzimir mill is beneficial for the improvement of the strip profile quality. 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 allows the application of a higher roll pressure without bending the work rolls, which would result in poor metal quality. Cold rolling mills yogijidigi can be your preferred supplier for cold rolling mills starting from planning, engineering, implementation and modernization of your plant. Rolling mill strip wipers allegheny ludlum corporation. The shape of cold strip for the stainless process has been become issue in quality. Other readers will always be interested in your opinion of the books youve read. The videohistory documents the story of a new approach to the rolling process of steel technology transfer and consumer demand for a new product. The components considered in a robust control design are detailed in fig. We are a leading distributor of mill rolls to the north american steel mill industry, with significant share of the long bar market.
This is due to the complexity of the control system design on such a mill, where many more degrees of freedom for. Two distinct vibration modes were found to be nealy 700 hz. It allows the application of a higher roll pressure without bending the work rolls, which would result in poor metal quality. Download pdf 499 kb abstract the shape control problem for a sendzimir 20roll cold rolling steel mill is characterised by operation over a wide range of conditions arising from roll changes, changes in rolling schedules and changes in material gauge, width and hardness. Find sendzimir, demag, hitachi, mino, continental, loewy, and nash for sale on machinio. Sendzimir mill z mill cold rolling steel ametek land. A shape control system based on a wavelet radial basis function network for a sendzimir mill zrm and fuzzy control are developed to improve the shape control performance of. Product quality and low scrap rates are supported during this highpressure rolling process by accurate noncontact temperature measurements. Such mills, with a variety of shape actuators, offer the control engineer considerable choice. The sendzimir mill is a rolling mill with cluster rolls for cold rolling such hard materials as stainless steel. Shape control in cluster mills michael sendzimir, 1993.
Zmill, sendzimir mill, cluster rolling mill waterbury farrel. The calculation of force for a roll system has significant effects on cold rolled thin strip gauge adjustment of a 20high sendzimir mill. 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. Shape is the second largest single cause for the rejection of cold rolled steel strip. We provide the infrared spot m210 thermometer, suitable for a wide temperature range, for this application. Over 60 years of experience in hot and cold rolling mills for carbon, stainless steel, and nonferrous rolling mills. This paper presents a system for the realtime optimization of the cold rolling processes for the 20 rolls sendzimir cluster mill. An investigation into the design and performance of an. Whether youve loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. Both are based on a process control computer to optimize process parameters for the cold rolling of stainless steels on a sendzimir mill by exploiting fully the structural and operational advantages of the mill.
Force model and elastic deformation analysis of 20high. The sendzimir manual is based on the reallife experiences of our top mill technicians. The z mill uses cascaded supporting rolls instead of using a single pair of rolls to apply force on the small work rolls in the center. Pdf predictive functionnal control of a sendzimir cold. A cluster type rolling mill intended to provide work roll sizes in the.
Sendzimirs rolling process departed dramatically from the multistand continuous process developed by john tytus armco 1924. The essential difference between sendzimir mill sendzimir cold rolling mill and other types of the mill is the direction of rolling force transmission. A static model of a sendzimir mill for use in shape control. Find sendzimir, demag, hitachi, bliss, mino, continental, davy mckee, loewy, nash, and spidem for sale on machinio. Mills rolling carbon steels can be classified in two groups. Zmill, sendzimir mill, cluster rolling mill waterbury. Robust shape control in a sendzimir coldrolling steel mill. 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. Instead of using multistand four high rolls sendzimirs mill used a clustered nest of rolls, like two inverted pyramids 1234 configuration. Stresses from hertzian pressure in 4high cold mill back up rolls were measured.
We would like to introduce ourselves as one of the leading manufacturers and exporter of wide range of forged hardened steel. 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. Bad shape is often caused by the mismatch between the roll gap profile and the. Shape or flatness control for rolled steel strip is becoming increasingly important as customer requirements become more stringent. Vibration analysis of a sendzimir cold rolling mill and bearing fault detection. Optimal control of thickness and flatness for the 20 rolls. With innovative and patented solutions, andritz sundwig is a global leader for the design of high quality cold rolling mills. Improved shape control performance of a sendzimir mill. As is known, sendzimir coldrolling mills feature several roll arrangements, a typical one of which is the 1234 arrangement illustrated in fig. Pdf shape control systems for sendzimir steel mills.
The special feature in a 20 high mill is the relation between work roll diameter and barrel length. Feb 03, 1981 in practice, for a 72 inch wide rolling mill, the sendzimir mill has a maximum work roll diameter of about 4 inches. The object of shape control is to adjust the mill so that the rolled strip is free from internal stresses. The deformation of rolls within the roll system as a whole is analyzed without pinpointing upon each roll and impact on the rolling process. Auto slow down2 accuracy gamma ray thickness measuring systems mill motor. Used waterbury farrel sendzimir zr168 12 rolling mill for sale 72199 by national machinery exchange inc in newark, new jersey. Automatic shape control is now more or less mandatory on all new fourhigh cold mills, but no comprehensive scheme yet exists on a sendzimir mill. Numerical analysis of strip edge drop for sendzimir mill. Work rolls of small diameter are used to apply a strong rolling force to hard materials, but this makes it difficult to ensure the desired surface flatness. This problem motivates predicting the cluster mill dynamics by using a numerical model. Shape control of alloy steel rolled by sendzimir mill. A shape control system based on a wavelet radial basis function network for a sendzimir mill zrm and fuzzy control are developed to improve the shape control performance of a conventional zrm sys. Analysis of vibration for sendzimir mill in cold rolling.
Strip vibration applies a dynamic component on the rolling force acting on the work roll and may excite the resonance of the mill stand. The work rolls 1,2 are offset in a horizontal direction relatively to backup rolls 4,5, so that the plane containing the axes a,a extends parallel to but offset relative to the plane containing the axes b,b of the backup. Cold rolling mill rolls our cold rolling mills rolls are widely used in cold rolling mills engaed in metal processing and for deforming various metals by passing them through rollers cold rolling mill rolls at a temperature below its recrystallization temperature. Multiroll cold mill stands are described using different terms depending on their type and manufacturer. The subject of this thesis is the static model of the sendzimir cold rolling mill, which is a 1234 type cluster mill. 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. Vibration characteristics analysis of a 20high sendzimir mill with. In order to clarify the vibration phenomenon in the sendzimir mill, two simulation models were developed to calculate the natural frequencies of sendzimir mill vibration, and the frequencies of mill vibration during the cold rolling of stainless steel strip were measured. The complete mill model is presented and contains two parts, the static. Multiroll cold rolling mills are used to process high grade steel strip and nonferrous metal strip. Cold rolling mill rolls, rolls for cold rolling mills. We can sell your used machinery or help you find a really good bargain on the secondhand market. 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. Pdf predictive functionnal control of a sendzimir cold rolling mill.
Our precision cold rolling mills have name brand recognition worldwide for gauge. 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. Sendzimir rolling mill technology and machine design. Our salespeople also keep tabs on whos looking for used equipment, so if you have equipment you wish to offload, we may well have someone waiting to make you an offer. This paper presents the implemtation of a predictive functional controller for the sendzimir 20high cold rolling mill. 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. 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.
Apr 07, 2016 zhengzhou hengzhong heavy machinery manufacturing co. The dynamic behaviour of rolls strongly depends on the rolling pressure in the roll bite. 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. Zmill 20 hi cluster type mill the waterbury farrel sendzimir rolling mill is the final answer to the need for highly precise, closetolerance rolled products. Both are based on a process control computer to optimize process parameters for the cold rolling of stainless steels on a sendzimir mill. A static model of a sendzimir mill for use in shape. Quarter waves were simulated by elastic deformation analysis of rolls considering bending deformation of back up rolls and the effect of control actuators on. In practice, for a 72 inch wide rolling mill, the sendzimir mill has a maximum work roll diameter of about 4 inches. Sejal is in charge of the engineering, delivery and commissioning of sendzimir mills invented by dr. Extensive experience in the area has led to the perfecting of these hydraulicallyloaded, gaugecontrolled mills for a variety of applications. Refer to the tapered roller bearing guide or to your timken. Drives and winders will be custom engineered per customer requirements.
This is brief introduction of cold rolling mill sendzimir mill. One group rolls highcarbon steel in narrow widths for saw blades and measuring tapes. From an actual rolling experiment it was verified that quarter waves could be reduced remarkerably by changing taper mode of the 1st intermediate roll. Keywords sendzimir steel mills, predictive functional control, shape. Figure 2 shows the upper cluster of a typical sendzimir cluster mill. The work rolls 1,2 are offset in a horizontal direction relatively to backup rolls 4,5, so that the plane containing the axes a,a extends parallel to but offset relative to the. The second group of stainless mills could be classified as true strip mills. A z mill or sendzimir mill is a machine for rolling steel.
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. Used waterbury farrel sendzimir zr168 12 rolling mill for. 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. Based on an compact model of the rolling process that exploits especially its response to the control inputs for strip thickness and flatness controls pu, et al.
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. A zmill or sendzimir mill is a machine for rolling steel. Advances in cold rolling technology sendzimir zhigh cold rolling mills in the 1980s michael g. The sendzimir manual is the definitive guide to the operation of cold rolling mills. Zhengzhou hengzhong heavy machinery manufacturing co. Our worldwide support service team is constantly searching for used equipment. Apr 29, 2016 sendzimir rolling mill technology and machine design. This mill is sold as a mill stand and internals only. Vibration analysis of a sendzimir cold rolling mill and. Deals with the problem of shape or flatness control for sendzimir 20roll cold rolling steel mills.
Fag bearings in a sendzimir mill examples of application engineering publ. Fag bearings in a sendzimir mill examples of application engineering. They usually start with strip previously cold rolled on a mill of the first group and 1 meter or less in. This mill combines the advantages of existing cluster mills heavier reductions per pass and between anneals with the advantages of fourhigh mills easier to maintain. Both static and dynamic models of the mill are required for the control system design. Pdf edgedrop control behavior for silicon strip cold. A basic understanding of the mechanics of rolling mill rolls file. The 20 high rolling mill from andritz sundwig is mainly used for cold rolling of metal strip to thinnest final gages and wide range of strip width.
A 20high sendzimir mill is widely used in cold rolling. A rolling mill for the treatment of sheet material comprises two work rolls 1, 2 which define a nip between which a web of material 3 is passed for rolling. Oct 10, 2017 a z mill is a machine for rolling steel. Shape control of alloy steel rolled by sendzimir mill springerlink. Pdf shape control systems for sendzimir steel mills researchgate. As is known, sendzimir cold rolling mills feature several roll arrangements, a typical one of which is the 1234 arrangement illustrated in fig. Open type backing roll bearings for sendzimir cold strip mill 10.