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Dec 22 2013018332The first module is called AGC while the second module is known as HGC AGC receives thickness set points from a higher level system It calculates and compensates for such things as roll wear heat expansion in the rolls stretch of the strand and.
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 the heat transfer between the work rolls and the strip This depends on the roll speed strip thickness the properties of the strip roll gap contact time and cooling parameters.
AGC thickness control of rolling mill is a control system with time delay traditional AGC control methods cannot get satisfying control performance 13 14 According to control theory to cope with the timedelay problem we can take the Smith predictor scheme.
The vibration frequency for the hot rolling mill in general is 1070 Hz As a result the vibration increases with mill modulus control AGC gain for the large sensitivity frequency range of hot rolling mills For these frequencies the mill modulus control gain can be decreased to relieve mill vibration 5.
Strip Thickness Control of Cold Rolling Mill with Roll been developed for hot or cold mill processes The British Iron and SteelResearch Association B1SRA AGC method based on the gaug meter principle and the feede forward AGC method using the delivery time of the strip have been widely utilized in steel rolling mills 3 Strip products thickness precision is an important quality parameter.
Automatic rolling process is a highspeed system which always requires highspeed control and communication capabilities Meanwhile it is also a typical complex electromechanical system distributed control has become the mainstream of computer control system for rolling mill Generally the control system adopts the 2level control structureampx2014basic automation Level 1 and process.
There are two types of processes One is Hot rolled and another is Cold Rolled If the strip is rolled after heating the strip above the recrystallization temperature then it is termed as Hot rolled and if that done in room temperature then it is termed as the Cold rolledRolling is a process that is widely used and has very high production.
In the application of roll lubriing hot rolling mills several concerns arise ie bite and roll slippage and effectiveness This paper studies the mechanism of roll lubrication of the reversing hot rolling mill theoretically and investigates the effect of the roll lubrication on mill.
Jul 28 2020018332In the rolling process the job is drawn through a set of rolls due to interface friction and the compressive forces reduce the thickness of the workpiece or change in its crosssectional areaThe types of rolls used in rolling mills The shape and size depending upon the gap between the rolls and their contour Because of workability and limitations in equipment rolling is done in.
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.
The Hot Finish mill forms the strip to the final dimension is an essential component of modern rolling mills Comprehensive AGC algorithms incorporate readings from dozens of sensors around the mill to control thickness to high tolerances realtime measurements that help meet specifications of various applications while maximizing.
Nov 12 2013018332been developed for hot or cold mill processes The British Iron and SteelResearch Association B1SRA AGC method based on the gaug meter principle and the feede forward AGC method using the delivery time of the strip have been widely utilized in steel rolling mills 3 Strip products thickness precision is an important quality parameter.
Jun 01 2007018332Abstract Recently the accuracy of hot strip gauge is strictly demanded and the strip thickness becomes the most important quality in hot strip rolling In order to improve the quality of the hot strip gage and to reduce the strip thickness deviation the automatic gauge control AGC system now is widely used in modern hot strip mills.
Jan 01 1983018332INTRODUCTION Most hot strip mills are equipped with AGCsystems on the finishing stands Installations vary from single stand to all stands AGC hydraulical or electrical positioned In most systems a feedback monitor control is available in modern installations a.
Strips with a width of less than 600 mm are called narrow strip steel and those with the width of more than 600 mm are wide strip steel The cardan shaft of the hot strip rolling mill is a very important transmission component in the entire rolling system which.
Over the years our steel mill applications has covered the whole steel making production line from ship unloader sintering machine coke ovens torpedo cars blast furnaces BOF basic oxygen furnaces EAF electric arc furnaces continuous casting machines furnaces hot strip mills plate mills rolling mills roughing stands finishing.
The demand for hot rolled strip is growing in multiple ways To remain competitive new and existing mills must meet this challenge in the best possible way The production of hot strip is a key element of steel production Since close to half of all steel produced is hotrolled to strip mills require maximum throughput and availability.
SMS DEMAG Hot Strip Mills 10 The drumtype shear installed between the roughing and finishing mills of a hot strip mill crops the transfer bar at its head and tail In special applications the drumtype shear also serves to divide transfer bars and finished plates Based on the experience gained from more than 60 drumtype shears built so far.
Tandem cold rolling mills are named by their stand arrangement and designed as sheet mills if they reduce hot band to sheet gauge or tin mills if they roll the same incoming material to tinplate stock A typical five stand tandem cold rolling mill is illustrated in Figure 1 Figure 1 A typical five stand tandem cold rolling mill.
Thickness precision is one of the most important quality indexes in strip rolling process 2 3Monitor automatic gauge control AGC based on hydraulic roll gap control system is widely used in modern strip rolling mills 47In monitor AGC system gauge meter is used to measure strip gauge derivation which is installed at the delivery side of the finishing mill.
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.
Spring model is important restrictive factors to improve the precision of AGC control system To improve the accuracy of strip gauge control Study on various influencing factors of spring model has important significance in rolling process Therefore using ABAQUS finite element software this paper establishes the whole stand model of strip rolling.
Dec 03 2015018332Rolling of steel in Hot Strip Mill satyendra December 3 2015 0 Comments AGC edger finishing mill hot strip mill Laminar cooling rolling speed scale breaker slab roughing mill tension Rolling of steel in Hot Strip Mill Hot strip mills in these days are either conventional hot strip mills or strip mills for rolling thin slabs.
C OUPLING VIBRATION MODEL FOR HOT ROLLING MILLS AND ITS APPLICATION JIMIN W U X IAOQIANG Y AN ISSN P RINT 13928716 ISSN O NLINE 25388460 K AUNAS L ITHUANIA 1799 speed at entry and exit respectively 246 5 246 6 and 246 225 are the strip entry angle the strip exit angle and the neutral angle respectively R 229 is the roll speed D 214 is the roll gap spacing along the.
Measures strip and sheet temperature to efficiently set up the rolling mill to match the steels temperature These sensors also detect the presence of hot metal to accurately time the roll stand operation for maximum efficiency LumaSense IS 320 Pyrometer 150C TO 1200C and LumaSense IGA 32023 200C TO 1800C were utilized.
Aug 01 1981018332Flatnes Control System for Hot Strip Mills Effect on Automatic Gauge Control Automatic gauge control AGC of final stand of finishing mill had not been used before flatness control was developed The main reason is that when AGC of final stand is activated the variation in rolling force injures flatness of the strip.