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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
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A Roll Eccentricity d Sdi Roll Eccentricity consists of 1st 4th order harmonic wave whose fundamental frequency is about 13radlsec and amplitude of 1st 4th order harmonic wave are about 20 J Un lih7 lib7 Fig 8 The relation of variables 13 2 J Un 6 8 J Un 4 J Un respectively mill of hot rolling process is shown
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Hot Rolling Mill Roll Eccentricity Crushing Temper Hot Cold Rolling Mill Steel Equipment Cold rolling bliss can assist customers in selecting the proper mill configuration and sie it specifically for the bliss can provide mills in two or four high roll arrangements include reel to reel installations inline mills
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Motors These are known as mill stands The layout of a rolling mill varies from a simple single stand mill to several stands positioned either side by side or in a line A mechanism commonly called a roller table directs the work piece to the rolls and another roller table for handling the pieces emerging out of the roll
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Hot Rolling Mills High Speed Rebar Mills Section Mills Bloom amp Slab Mills Wire Rod amp Block Mills High speed Tandem Mills High Speed Delivery Systems Automatic Cooling Beds Transfer Skids Loopers Manipulators Rolling Mill Auxiliaries Roller Guide Boxes Hot Saws Shearing Machines and Rolling Mill Automation Cold Rolling Mills 2 Hi
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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
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In the metalworking rolling process in hot and cold rolling mills heat is generated by friction and deformation in the mechanical forming of the rolling stock As a result efficient cooling of the rolls as well as the surrounding roll area is essential for the forming process in order to ensure stable roll temperatures and effective heat
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Kubotas Rolling Mill Rolls Support the World Steel Industry In 1961 Kubota became the first company in the world to adopt the centrifugal casting method for the production of mill rolls It enables to produce a multi layer composite rolls which revolutionized mill roll material
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Quick work and back up roll changhing for rolling mills Q MPE Mechanical properties estimator for hot rolled flat products The modern solutions for compact hot rolling mills PQL Premium quality leveler suite to increase plate leveler capacity Automatic eccentricity compensation X TRIM Side trimmer for cold rolling mills and
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3 Know 1 Jun 2016 3 roll Cross Rolling Mill CRM at Vallourec Deutschland The CRM will be installed between the vertical piercing press and the pilger mill and for extreme service conditions e g boiler tubes tubes for petrochemical applications As soon as the rolling operation is over the elongated hollow is moved
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A 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
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Abstract This paper deals with the parameter estimation and online monitoring of roll eccentricity in rolling mills Roll eccentricity induced disturbances can result in strip thickness deviation and product quality degradation and a conventional control strategy cannot regulate this kind of periodic disturbances due to its complex characteristics
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ARTICS Hot Rolling Mills Real time control for Hot Rolling Mills With than 50 years of experience Nidec Industrial Solutions has developed a vast array of functions based on auto adaptive mathematical models that optimize rolling schedule calculations in real time
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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
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A Cold Rolling Mill rolls in subsequent short passesdue 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 efficient and fast coil handling to minimize the waiting time
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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
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The ZR mill is a mill for cold rolling of hot rolled coils of stainless steel and other hard materials to the designated product thickness and strip shape accuracy The ultra small diameter rolls are firmly supported in a 20Hi roll cluster arrangement
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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
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Jul 18 2013 2009 Reducing thickness variation of hot rolled steel strip by non circular back up roll geometry Ironmaking amp Steelmaking Vol 36 No 2 pp 133 140
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Roll theory training for rolling mills Publishing a book STEEL 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
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Abstract This paper is concerned with the active compensation of the roll eccentricity induced periodic disturbances in the strip exit thickness of hot and cold rolling mills The roll eccentricity may be caused by different reasons like e g inexact roll grinding or nonuniform thermal expansion of the rolls
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Jun 15 1996 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 Todays demand on thickness tolerances less than 0 8 require efficient methods for roll eccentricity identification and compensation
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This paper deals with the parameter estimation and online monitoring of roll eccentricity in rolling mills Roll eccentricity induced disturbances can result in strip thickness deviation and
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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
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