Rolling Mill Tutorial - Part 5. Before continuing, make sure you have read Section 21.11 Linear Optimal Filters. Observers. To estimate roll eccentricity, we view the output of the BISRA gauge which is h e as the eccentricity e plus some noise. Before we can use an observer to estimate the roll eccentricity, we need to model it.
Most primary rolling is done in either a two high reversing mill or a three-high continuous rolling mill. Final products from hot rolling include plates, strips and a wide variety of bars and sections. Plates and strips are normally rolled between two plain cylindrical rolls, or on four-high mills. a. Two-High Reversing Mill.
In order to compensate the roll eccentricity in hot strip rolling process, a multi-resolution wavelet transform method was proposed. This wavelet method has quiet good localization characteristic in both time domain and frequency domain. To eliminate frequency aliases inhered in Mallat algorithm, an anti-aliasing algorithm combining fast Fourier transform FFT and inverse fast Fourier.
LQG 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.
Planning, designing, manufacturing and installation from one single source if you need more than a highly productive stand-alone roll grinder and EDT machine, WaldrichSiegen is your partner for the supply of a complete roll shop.
Hot Rolling Plant Sunghoo Choi To make a hot rolled coil, a roughing mill and nish-ing mill are used. Slabs are rolled roughly in the roughing mill because they are hard to be rolled to a required thickness at one time. And then the strip passes through the nish- the roll eccentricity play a key role in determining the AGC.
The worlds first 4-high Continuous Hot Strip Steel Rolling Mill, which made it possible for width and gauge ratios to be increased from 2501 to 5001 up to 10001 1 Mtpy rolling mill for section and rails in-line heat treated 100-m-long rails for high-speed trains. 2013 Danieli Morg229rdshammar. New 3 roll Elongator Mill for Vallourec.
Modern four-high mills all set corresponding offset value 1, 2, such as 2050 CVC four-high rolling mill and 4300-medium plate mill of the German SMS, four-roll rolling mill of the British DAVY, 1580-pair cross four-high rolling mill of Japan Mitsubishi heavy industries. But these modern four-high mills with offset all have roller parallel.
Aluminum Rolling Mills Temperature Control in the Hot Rolling Mill. Aluminum sheet and plate products are used for a wide range of applications, including can stock, brazing, automotive and aerospace. These industries demand exacting tolerances and precise mechanical properties, particularly for new, technically challenging high-strength alloys.
The technologies incorporated in a modern hot strip mill to in improve the product quality are i automatic gauge control, ii automatic width control, iii work roll bending, iv continuous varying crown CVC,and v roll eccentricity compensation.
P. Kucsera et al. Hot Rolling Mill HGC Thickness Control Improvement 98 Another way to determine the thermal expansion of the work roll is the modelling of.
Jul 01 1987 183 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 apparently small levels of.
Roll eccentricity is widespread in the strip mill, has cyclical impact on strip thickness, so disturbance compensation is required to improve the product quality. The key step of disturbance compensation is to obtain reliable roll eccentricity signal. Existing direct measurements of roll eccentricity signal method requires special equipments with high precision but not practical enough.
Hot rolling mill thus helps in reducing the size of a metal thereby molding it into the desired form and shape. Rolling mills perform the function to reform the metal pieces such as billet and ingot whilst maintaining its well equipped micro structure into bar, wire, sheet, strip, and plate. Hot rolled products are frequently categorized.
The empirical research took place at a hot strip mill. As a result, the 3D ground non-circular geometry of the backup rolls considerably reduced the rolling force variation. Key words non-circular grinding, rolling mill, backup roll, rolling force variation. 1. INTRODUCTION Contemporary steel mills are operating on a global market and the.
Depending on the product mix, a single-stand cold rolling mill can deliver rolling capacities of 100,000 to 400,000 ta. Rolling schedules can be carried out with an even or odd number of passes to maximize mill availability and performance.
Flat product rolling mills require well- bearings for rigorous applications in hot and cold rolling mills, while continuously improving the companys bearings and seals to keep pace with the demands of the metals industry. and eccentricity. Secondary seal lip.
Dec 03, 2015018332The rolling speed is set to allow the last stand to perform the final reduction at the finishing temperature, between 820 deg C to 900 deg C, so as to achieve certain mechanical properties in the hot rolled strip. The finishing mills roll the transfer bar in tandem, meaning each bar is rolled through all the finishing stands at once.
Jan 26, 1993018332A rolled plate with uniform thickness and flatness from a rolling mill is a goal constantly pursued by many steel plate manufacturers. Among the various factors which affect the thickness and flatness of the rolling plate, eccentricity of the backup roll is most decisive.
In rolling mill, the accuracy and quality of the strip exit thickness are very important factors. To realize high accuracy in the strip exit thickness, the Automatic Gauge Control AGC system is used. Because of roll eccentricity in backup rolls, the exit thickness deviates periodically. In this paper, we design PI controller in outer loop for the strip exit thickness while PD controller is.
Rolling phases will be initiated automatically on the basis of the latest coil, roll and adaptation data as well as the operator trimming values and a product dependent rolling specification. Adaptive models for roll force, torque, forward slip, roll and strip temperature, thermal crown, mill stand module, roll bending and wear are used to predict.
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. When there is a large difference of diameters between top and bottom back up roll, the performance of roll eccentricity control using.
CiteSeerX - 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.
Roll theory training for rolling mills. Publishing a book quotSTEEL ROLLING Principle, Process - LinkedIn. Sep 25, 2015 3 Theory of Microscopic Plasticity 4 Methods of Metal 8 Selection of Rolls for different category of Rolling Mills 2.1 Open Train Billet.
In this study, a new diagnosis method for roll eccentricity under the roll speed changes was developed. The new method was induced from analyzing the rolling mechanism by using rolling force models, radius-speed relationship, and measured rolling force, etc. Simulation results by using the field data show that the proposed method is very useful.
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