Two distinct vibration modes were found to be nealy 700 hz. Pdf shape control systems for sendzimir steel mills researchgate. Quarter waves were simulated by elastic deformation analysis of rolls considering bending deformation of back up rolls and the effect of control actuators on. Automation for shape control in stainless cold rolling mill. 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. The special feature in a 20 high mill is the relation between work roll diameter and barrel length. The essential difference between sendzimir mill sendzimir cold rolling mill and other types of the mill is the direction of rolling force transmission. 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. Optimal control of thickness and flatness for the 20 rolls. 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.
Inventor tadeusz sendzimir, a polish immigrant, designed and installed the first z mill for cold rolling stainless steel in the united states. 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. We can sell your used machinery or help you find a really good bargain on the secondhand market. Zmill, sendzimir mill, cluster rolling mill waterbury farrel. Sendzimir mill characteristics cold rolling mill hani tech. We would like to introduce ourselves as one of the leading manufacturers and exporter of wide range of forged hardened steel. 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 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. Zmill, sendzimir mill, cluster rolling mill waterbury. The complete mill model is presented and contains two parts, the static. 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. We are a leading distributor of mill rolls to the north american steel mill industry, with significant share of the long bar market. Over 60 years of experience in hot and cold rolling mills for carbon, stainless steel, and nonferrous rolling mills.
The sendzimir manual is based on the reallife experiences of our top mill technicians. With innovative and patented solutions, andritz sundwig is a global leader for the design of high quality cold rolling mills. A static model of a sendzimir mill for use in shape. Strip vibration applies a dynamic component on the rolling force acting on the work roll and may excite the resonance of the mill stand. Numerical analysis of strip edge drop for sendzimir mill. Force model and elastic deformation analysis of 20high. Shape control in cluster mills michael sendzimir, 1993. They usually start with strip previously cold rolled on a mill of the first group and 1 meter or less in. 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. As is known, sendzimir coldrolling mills feature several roll arrangements, a typical one of which is the 1234 arrangement illustrated in fig. Multiroll cold mill stands are described using different terms depending on their type and manufacturer. Bad shape is often caused by the mismatch between the roll gap profile and the. Sendzimir mill z mill cold rolling steel ametek land. Advances in cold rolling technology sendzimir zhigh cold rolling mills in the 1980s michael g.
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. Multiroll cold rolling mills are used to process high grade steel strip and nonferrous metal strip. Oct 10, 2017 a z mill is a machine for rolling steel. Apr 07, 2016 zhengzhou hengzhong heavy machinery manufacturing co. Improved shape control performance of a sendzimir mill. This is due to the complexity of the control system design on such a mill, where many more degrees of freedom for. The dynamic behaviour of rolls strongly depends on the rolling pressure in the roll bite.
Robust shape control in a sendzimir coldrolling steel mill. Our precision cold rolling mills have name brand recognition worldwide for gauge accuracy, flatness of strip shape, and ultrathin gauge. 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. A static model of a sendzimir mill for use in shape control. Sejal is in charge of the engineering, delivery and commissioning of sendzimir mills invented by dr.
Analysis of vibration for sendzimir mill in cold rolling. Fag bearings in a sendzimir mill examples of application engineering. Sendzimir rolling mill technology and machine design. 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. Find sendzimir, demag, hitachi, mino, continental, loewy, and nash for sale on machinio. Our precision cold rolling mills have name brand recognition worldwide for gauge. Rolling mill technology and machine design sendzimir. Extensive experience in the area has led to the perfecting of these hydraulicallyloaded, gaugecontrolled mills for a variety of applications. This paper presents a system for the realtime optimization of the cold rolling processes for the 20 rolls sendzimir cluster mill. 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.
This problem motivates predicting the cluster mill dynamics by using a numerical model. A zmill or sendzimir mill is a machine for rolling steel. 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. The sendzimir manual is the definitive guide to the operation of cold rolling mills.
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. Refer to the tapered roller bearing guide or to your timken. The sendzimir mill is a rolling mill with cluster rolls for cold rolling such hard materials as stainless steel. 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. Rolling mill strip wipers allegheny ludlum corporation. 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. Pdf edgedrop control behavior for silicon strip cold. 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. Pdf shape control systems for sendzimir steel mills. Pdf predictive functionnal control of a sendzimir cold rolling mill.
Shape control of alloy steel rolled by sendzimir mill springerlink. Cold rolling mill rolls, rolls for cold rolling mills. A z mill or sendzimir mill is a machine for rolling steel. It allows the application of a higher roll pressure without bending the work rolls, which would result in poor metal quality.
Used waterbury farrel sendzimir zr168 12 rolling mill for sale 72199 by national machinery exchange inc in newark, new jersey. Fag bearings in a sendzimir mill examples of application engineering publ. The object of shape control is to adjust the mill so that the rolled strip is free from internal stresses. This allows the application of a higher roll pressure without bending the work rolls, which would result in poor metal quality. Improved shape control performance of a sendzimir mill using.
Vibration characteristics analysis of a 20high sendzimir mill with. Shape control of alloy steel rolled by sendzimir mill. Both static and dynamic models of the mill are required for the control system design. Figure 2 shows the upper cluster of a typical sendzimir cluster mill. Instead of using multistand four high rolls sendzimirs mill used a clustered nest of rolls, like two inverted pyramids 1234 configuration. Sendzimirs rolling process departed dramatically from the multistand continuous process developed by john tytus armco 1924. As is known, sendzimir cold rolling mills feature several roll arrangements, a typical one of which is the 1234 arrangement illustrated in fig. 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. From an actual rolling experiment it was verified that quarter waves could be reduced remarkerably by changing taper mode of the 1st intermediate roll. Vibration analysis of a sendzimir cold rolling mill and bearing fault detection. 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.
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. The calculation of force for a roll system has significant effects on cold rolled thin strip gauge adjustment of a 20high sendzimir mill. 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. 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. We provide the infrared spot m210 thermometer, suitable for a wide temperature range, for this application. 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. A basic understanding of the mechanics of rolling mill rolls file. 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 of. Cold rolling mills yogijidigi can be your preferred supplier for cold rolling mills starting from planning, engineering, implementation and modernization of your plant. Keywords sendzimir steel mills, predictive functional control, shape. 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. Stresses from hertzian pressure in 4high cold mill back up rolls were measured.
The shape of cold strip for the stainless process has been become issue in quality. 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. Zhengzhou hengzhong heavy machinery manufacturing co. The deformation of rolls within the roll system as a whole is analyzed without pinpointing upon each roll and impact on the rolling process. 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. 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. Andritz sundwig solutions are known for their customeroriented design. 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. Other readers will always be interested in your opinion of the books youve read. Report on best available techniques bat in the german. This paper presents the implemtation of a predictive functional controller for the sendzimir 20high cold rolling mill. 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.
This mill is sold as a mill stand and internals only. This is brief introduction of cold rolling mill sendzimir mill. An investigation into the design and performance of an. Shape or flatness control for rolled steel strip is becoming increasingly important as customer requirements become more stringent. Such mills, with a variety of shape actuators, offer the control engineer considerable choice. A 20high sendzimir mill is widely used in cold rolling. Apr 29, 2016 sendzimir rolling mill technology and machine design. The second group of stainless mills could be classified as true strip mills. 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. Shape is the second largest single cause for the rejection of cold rolled steel strip. Product quality and low scrap rates are supported during this highpressure rolling process by accurate noncontact temperature measurements. One group rolls highcarbon steel in narrow widths for saw blades and measuring tapes.
In practice, for a 72 inch wide rolling mill, the sendzimir mill has a maximum work roll diameter of about 4 inches. Sendzimir used zhigh zr 6732 rolling mill for sale. The videohistory documents the story of a new approach to the rolling process of steel technology transfer and consumer demand for a new product. Find sendzimir, demag, hitachi, bliss, mino, continental, davy mckee, loewy, nash, and spidem for sale on machinio. The components considered in a robust control design are detailed in fig. Calculation and analysis of force in roll system of 20high. Our worldwide support service team is constantly searching for used equipment. Deals with the problem of shape or flatness control for sendzimir 20roll cold rolling steel mills. 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. Mills rolling carbon steels can be classified in two groups. Vibration analysis of a sendzimir cold rolling mill and. Used waterbury farrel sendzimir zr168 12 rolling mill for. Both are based on a process control computer to optimize process parameters for the cold rolling of stainless steels on a sendzimir mill. Auto slow down2 accuracy gamma ray thickness measuring systems mill motor.
Drives and winders will be custom engineered per customer requirements. 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. Pdf predictive functionnal control of a sendzimir cold. The subject of this thesis is the static model of the sendzimir cold rolling mill, which is a 1234 type cluster mill.
1236 728 462 40 523 110 447 157 112 352 755 825 165 1567 803 277 213 798 470 448 53 1486 290 707 540 778 120 1026