The roll eccentricity in a rolling mill may define the limit of achievable thickness tolerances and thus is subject of interest for the automation equipment in hot rolling mills as well as in cold rolling mills. Today's demand on thickness tolerances less than 0.8% require efficient methods for roll eccentricity identification and compensation.
LEE MASThe invention relates to the control of rolling mill backup roll eccentricity by combining the load carrying characteristics of rolling mill tapered roller bearing assemblies during rolling with prescribed levels of axial thrust to effect a controlled deflection of backup roll necks on a 4-high rolling mill or the like due to the selected thrust force applied axially to the ends or necks of ...
LEE MASCold Rolling Mills The evolution of rolling mills has accelerated as the speed of processors and digital controls have grown by orders of magnitude. The capital cost in a rolling mill is substantial and investors understand that in order to achieve the maximum ROI and shortest payback time, the mill needs to produce high quality sheet at the ...
LEE MASA theoretical analysis has shown that axial slipping of the sleeve on the roll arbor rather than plastic deformation of the roll necks may be the cause of backup-roll eccentricity on cold-rolling mills. The force levels required to initiate the slipping motion are less …
LEE MASBurkhard Schöttler,Dipl. Engineer. "IMS has been building measuring systems for the tube manufacturing industry of this world for more than 30 years – and every single measuring system has been engineered to exactly meet the requirements of the rolling mill. We build customer-specific individual solutions, for state-of-the-art PQF and FQM ...
LEE MASrolling mill, dedicated roll cooling systems are required to fulfill the required functions. Examples are suitable roll cooling and lubricationsystems to fully utilize the advantages of HSS rolls in hot strip mills, and selective roll cooling systems as a method to control the flatness of the strip in cold rolling mills.
LEE MASRoll eccentricity is ubiquitous in strip mills, which has a periodic impact on the strip thickness difference. Roll eccentricity compensation is an important part of the automatic gauge control system. Most roll eccentricity compensations extract the roll eccentricity based on the frequency domain analysis of …
LEE MASRolling mill simulator A new platform for testing, analysis and optimization of cold rolling mills. Axel Brickwedde, Frank Feldmann, Nicolas Soler The cold rolling of flat metal products especially in tandem or multi-stand mills is a highly complex process where …
LEE MASRoll eccentricity compensation. Roll eccentricity is a periodic disturbance caused by a structure of back up rolls in rolling mills, and it affects product thickness accuracy. It cannot be measured directly by sensors, so it should be identified by measured thickness or measured roll force.
LEE MASRolling mill eccentricity compensation using actual measurement of exit sheet thickness: : Oliver et al. 72/8: 4126027: Method and apparatus for eccentricity correction in a rolling mill: : Smith, Jr. et al. 72/21: 3882705: Roll eccentricity correction system and method: : Fox: 72/11: 3881335: Roll eccentricity ...
LEE MASElimination of a known strip thickness quality disturbance from rolls. Improved strip quality, improved thickness tolerances also at high rolling speeds. Maintenance-friendly: uses existing thickness, roll load, or strip tension measurements as feedback for control, hence: easy to implement in existing basic automation environments.
LEE MASThe analysis of a two-stand aluminium cold rolling mill has shown that process-related disturbances such as backup roll eccentricities and harmonic strip hardness variations can make it difficult to meet the target thickness tolerance. Backup roll eccentricity is not only the result of grinding and roll assembly tolerances, but can also be ...
LEE MASThis brief proposes a robust subspace-aided fault detection approach for rolling mill processes with roll eccentricity. The novelty of this brief relies on the closed-loop identification of the so-called data-driven realization of the stable kernel representation (SKR) of the rolling mill process. In order to ensure an accurate and robust closed-loop identification, the mappings among the ...
LEE MASRepetitive control is applied here to compensate for roll eccentricity disturbances in thickness control of the cold rolling process. A unique aspect of the process is that the eccentricity disturbance may be from multiple rolls and hence may be composed of multiple periodic components whose periods may not be commensurate, namely, divisible by a common factor an integral number …
LEE MASThe eccentricity disturbance is modeled as white noise w_e driving a band-pass filter Fe. The input thickness disturbance is modeled as white noise w_i driving a low-pass filter Fi. Feedback control is necessary to counter such disturbances. Because the roll gap delta cannot be measured close to the stand, the rolling force f is used for feedback.
LEE MAShot rolling mill roll eccentricity. Jul 01 1987 · SIMULATION RESULTS In eccentricity control the following practical considerations apply to production rolling mills and thus should be cons idered in the des ign of relevant simulation studies • the incoming feed can introduce periodic disturbances in the form of hot rolled thickness disturbances or uncoiler induced tension fluctuations ...
LEE MASThe SMS group developed directube ® to enable coppertube manufacturers to produce high-quality tubes on a highly efficient Basis. Our directube ® system casts tube shells from copper cathodes on a horizontal continuous casting plant. Then a planetary rolling mill directly converts them into mother tubes. This short process route results in high efficiency and lower energy consumption.
LEE MASImplementation on the two-stand cold rolling mill After the successful simulation study, the control concepts were implemented on the two-stand cold rolling mill. For this purpose the new controllers for compensating eccentricity and hardness variations were programmed in the ABB Automation System 800xA (Controller AC 800PEC) and connected to the
LEE MASRolling schedules can be carried out with an even or odd number of passes to maximize mill availability and performance. The Universal Crown Control mill (UCM mill) with work roll bending, intermediate roll bending, intermediate roll shifting and all straight roll application ensure enhanced flatness control.
LEE MASRoll eccentricity elimination control PC1: Rougher master, table master PC2: Rougher sub-machine control master PC3: Machines around rougher mill control master, Automatic gauge control PC4: Slab cooling temperature control Figure 2 Configuration of computer control system for hot strip rolling mill Roll thermal crown calculation Finisher set-up
LEE MASLQG Regulation: Rolling Mill Case Study Overview of this Case Study. This case study demonstrates the use of the LQG design tools in a process control application. The goal is to regulate the horizontal and vertical thickness of the beam produced by a hot steel rolling mill.
LEE MASPREET South America: Parque Industrial Star Interior 1040. CP 66600 Apodaca N.L., Mexico. Help Line: +52(81)14843338 Email: [email protected]
LEE MASModern rolling practice can be attributed to the pioneering efforts of Henry Cort of Funtley Iron Mills, near Fareham in Hampshire, England.In 1783, a patent was issued to Henry Cort for his use of grooved rolls for rolling iron bars. With this new design, mills were able to produce 15 times more output per day than with a hammer. Although Cort was not the first to use grooved rolls, he was ...
LEE MASThe invention provides a new apparatus for the detection, measurement and display of roll and roll bearing eccentricity in a rolling mill, and also an apparatus for correction of such eccentricities. The apparatus comprises individual narrow band-pass filter modules, each dedicated to the detection and development of a signal corresponding to one eccentricity, such as fundamental back-up roll ...
LEE MASAn encoderless roll eccentricity compensation system for rolling mills and sheet casters; Shop floor inventory and production tracking systems for hot rolled plate and coiled products and for sheet finishing operations; A standard hydraulic mill stand control product for rolling mills
LEE MASSep 01, 2001· Thickness deviations of the steel plates in the rolling mill process is mainly caused by the roll eccentricity of the back up roll (BUR). In this paper, a bandpass filter with high gain in the given frequency is introduced which is able to overcome the roll eccentricity of BUR and is very simple compared with other roll ...
LEE MASHOME. ABOUT US. CARBON STEEL Carbon steel sheet/plate. Carbon steel coil. Carbon steel pipe/tube. Carbon steel bar/rod. PPGI. Other carbon steel products
LEE MASCiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The Force Feed Forward (FFF) System is the only hot strip mill AGC system in the world today which does not incorporate the BISRA principle for gage control. Instead, using a revolutionary control algorithm, FFF has proven in five installations in North and South America, that steelmakers need not replace their ...
LEE MASRolling mill is the core equipment in modern iron and steel industry, and the reliability of its mill roll system (MRS) is the key to ensure the rolling process with high precision, high speed ...
LEE MASRoll Eccentricity Extraction Method Based on . In modern steel production strip products account for more than half of the total output Roll eccentricity is ubiquitous in strip mills which has a periodic impact on the strip thickness difference Roll eccentricity compensation is an important part of the automatic gauge control system Most roll eccentricity compensations extract the roll ...
LEE MASAwtm/ia Abstract: An in-depth review of the roll eccentricity control design problem is provided which encompasses a number of recent, novel, design contributions and includes experimental results from two separate steel, tandem cold rolling mill installations. A unifying approach to eccentricity control ~nables the diverse range of published ...
LEE MASA Cold Rolling Mill rolls, in subsequent short passes(due to the relative thick material), coiled strip from a thickness of up to 8 mm (coming from Hot Rolling Mill) down to 0.2 mm; the mill is designed with high rolling force and power capability and …
LEE MASDOI: 10.4236/ENG.2014.61005 Corpus ID: 30768077. Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network @article{Hameed2014StripTC, title={Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network}, author={W. I. Hameed and K. Mohamad}, journal={Engineering}, …
LEE MASFinished steel pipe Cold drawn steel pipe can also cause eccentricity problems due to perforation: Any factor that destroys the geometrical correctness of the deformation zone formed by the roll, the head and the guide plate will increase the uneven thickness of the capillary wall. (1) Head.
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