how to control eccentricity problem in hot rolling mill

  • ANALYSIS OF CAMBER FORMATION SUPPRESSION AND

    2020 7 22   The hot rolling process can be considered as a key step within the production chain of high quality steel strip and plate material. To attain a more detailed insight into the elasto viscoplastic forming phenomena 13 during the rolling process 4 the application of customized modeling tools is essential.

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  • HOT ROLLING PRACTICEAn Attempted Recollection

    2018 4 12   HOT ROLLING PRACTICEAn Attempted Recollection Saral Dutta. B. Tech. Hons. I.I.T. Executive Director ISP RMD SAIL Retired Rolling is a metal forming process in which metal stock is passed through a pair of rolls. There are two types of rolling processflat and profile rolling. In flat rolling the final shape of the product is either

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  • The development of the theory of metal rolling and its

    2017 8 9   mill and control must be based. Rolling theory can be divided into two broad and general cate gories that which applies to hotrolling and that which applies to cold rolling. In hotrolling the yield stress characteristic of the metal is strain rate dependent and frictional force between the roll and stock is

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  • Modeling for control of a Steckel hot rolling millIEEE

    2000 9 27   Modeling for control of a Steckel hot rolling mill Abstract Shows the derivation of a nonlinear plant simulator which reflects the thickness crown and tension of a hot rolled strip. The simulator is used for the identification of a linear model using system identification techniques.

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  • Online Eccentricity Monitoring Weihong Guo of Seamless

    2019 9 10   Online Eccentricity Monitoring of Seamless Tubes in Cross Roll Piercing Mill Wall thickness eccentricity is a major dimensional deviation problem in seamless steel tube production. Although eccentricity is mainly caused by abnormal process conditions in the cross roll piercing mill most seamless tube plants lack the monitoring at the hot

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  • HOT ROLLING PRACTICEAn Attempted Recollection

    2018 4 12   HOT ROLLING PRACTICEAn Attempted Recollection Saral Dutta. B. Tech. Hons. I.I.T. Executive Director ISP RMD SAIL Retired Rolling is a metal forming process in which metal stock is passed through a pair of rolls. There are two types of rolling processflat and profile rolling. In flat rolling the final shape of the product is either

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  • Improving the Prediction of the Roll Separating Force in a

    2017 7 5   rolling mill products have led to great efforts to improve the control and automation systems of the rolling process 1 3 . Hot steel rolling is one of the most important steel manufacturing processes. Hot rolling is the first metal shaping process after the slab has been cast in

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  • Roll eccentricity compensation based on anti aliasing

    Roll eccentricity is an important factor causing thickness variations during hot strip rolling and might define the limit of strip thickness control accuracy. An improved multi resolution wavelet transform algorithm was proposed to compensate for the roll eccentricity. The wavelet transform method had good localization characteristics in both the time and frequency domains for signal analysis

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  • The Hot Rolling ProcessCalifornia Steel

    The Hot Rolling Process The primary function of the Hot Strip Mill is to reheat semi finished steel slabs of steel nearly to their melting point then roll them thinner and longer through 12 successive rolling mill stands driven by motors totaling 77 000 hp and finally coiling up the lengthened steel sheet for transport to the next process.

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  • A BASIC UNDERSTANDING OF THE MECHANICS OF

    2003 10 15   Secondary scale on hot strip and the impact on wear is another issue. Stresses from Hertzian pressure in 4 high cold mill back up rolls were measured years ago the results were never published but of high interestalso maybe later. K. H. Schröder July 2003 K. H. Schröder A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING MILL ROLLS

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  • Roll Eccentricity Control for Strip Rolling Mills

    1987 7 1   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 hysteresis can produce significant thickness errors • eccentricity effects may be different from one side of a mill

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  • Process controller For rolling mills and processing lines

    2021 2 17   Control and configuration software The control software and the configuration tool cover all ranges of rolling mill control functionality from sequential control to drives and technological controls like roll gap or automatic gauge control. All functionality can be

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  • Advanced Process and Quality Control in Hot Rolling Mills

    2007 11 2   3.1 Key Feature of Process Control Detection of Periodic Defects Rolls and rollers are the most heavily used parts of a rolling mill. Due to wear from contacting hot material with great force their lifetime is limited. Although rolls are refurbished in the roll shop regularly they occasionally crack before the end of the usual production cycle.

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  • Process controller For rolling mills and processing lines

    2021 2 17   Control and configuration software The control software and the configuration tool cover all ranges of rolling mill control functionality from sequential control to drives and technological controls like roll gap or automatic gauge control. All functionality can be

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  • Experimental Study and Application of Process Control on

    The performance of hot strip mill depends on the cooling process after hot rolling. One important point of improving the technology of controlled cooling after rolling is understanding the effect of process parameters. Heat transfer coefficient is a significant physical parameter during the cooling process. However there are a lot of difficulties to

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  • The Hot Rolling ProcessCalifornia Steel

    The Hot Rolling Process The primary function of the Hot Strip Mill is to reheat semi finished steel slabs of steel nearly to their melting point then roll them thinner and longer through 12 successive rolling mill stands driven by motors totaling 77 000 hp and finally coiling up the lengthened steel sheet for transport to the next process.

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  • Hot Rolling Mill Hydraulic Gap Control HGC thickness

    2015 11 4   accuracy in thickness control in metal rolling area. If the required accuracy of hot rolling mills can be achieved then in some cases cold rolling is not even required which can result in a radical decrease of production costs. The schematic structure of a typical aluminum hot reversing rolling mill can be seen in Figure 1.

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  • Modeling for control of a Steckel hot rolling millIEEE

    2000 9 27   Modeling for control of a Steckel hot rolling mill Abstract Shows the derivation of a nonlinear plant simulator which reflects the thickness crown and tension of a hot rolled strip. The simulator is used for the identification of a linear model using system identification techniques.

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  • Roll Eccentricity Control for Strip Rolling Mills

    Friction induced hysteresis is shown to be a major cause of poor performance whose impact can be minimised by the appropriate location of load cells and the correct control design strategy. Advantages arising from the design are suitability for hot and cold 4 high rolling mills with or without pulse generators on the undriven backup rolls and modest computational requirements.

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  • Strip Thickness Control of Cold Rolling Mill with Roll

    2014 1 13   where M is mill modulus The BISRA relationship is used to develop a thickness feedback signal for closed loop control. To control the output thickness the motion of hydraulic cylinder con trolling the roll gap position is such that produces the desired output thickness. Roll eccentricities are caused by axial deviations between the roll barrel and the roll necks due to irregularities in the mill rolls and/or

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  • Modeling and control of a four high heavy plate rolling mill

    In heavy plate rolling the heated plates are plastically deformed by rolling mills. For this task reversing four high mill stands consisting of two work rolls and two backup rolls are often used. The plate is deformed between the two work rolls in several rolling passes. The high rolling forces during the deformation cause the work rolls to

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  • The Hot Rolling ProcessCalifornia Steel

    The Hot Rolling Process The primary function of the Hot Strip Mill is to reheat semi finished steel slabs of steel nearly to their melting point then roll them thinner and longer through 12 successive rolling mill stands driven by motors totaling 77 000 hp and finally coiling up the lengthened steel sheet for transport to the next process.

    Chat Online

  • The development of the theory of metal rolling and its

    2017 8 9   mill and control must be based. Rolling theory can be divided into two broad and general cate gories that which applies to hotrolling and that which applies to cold rolling. In hotrolling the yield stress characteristic of the metal is strain rate dependent and frictional force between the roll and stock is

    Chat Online

  • Experimental Study and Application of Process Control on

    The performance of hot strip mill depends on the cooling process after hot rolling. One important point of improving the technology of controlled cooling after rolling is understanding the effect of process parameters. Heat transfer coefficient is a significant physical parameter during the cooling process. However there are a lot of difficulties to

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  • PROCESS OF ROLLING MILLS

    2016 2 25   If a mill rolls 80 of the calendar year that is 365 x 24 x 0.80 = 7008 hours. If the mill rolls 800 000 tons per year it runs at an average production rate of 114.16 tons/hour. If the

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  • Online Eccentricity Monitoring Weihong Guo of Seamless

    2019 9 10   Online Eccentricity Monitoring of Seamless Tubes in Cross Roll Piercing Mill Wall thickness eccentricity is a major dimensional deviation problem in seamless steel tube production. Although eccentricity is mainly caused by abnormal process conditions in the cross roll piercing mill most seamless tube plants lack the monitoring at the hot

    Chat Online

  • Hot Rolling Mill Hydraulic Gap Control HGC thickness

    2015 11 4   accuracy in thickness control in metal rolling area. If the required accuracy of hot rolling mills can be achieved then in some cases cold rolling is not even required which can result in a radical decrease of production costs. The schematic structure of a typical aluminum hot reversing rolling mill can be seen in Figure 1.

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  • HOT ROLLING PRACTICEAn Attempted Recollection

    2018 4 12   HOT ROLLING PRACTICEAn Attempted Recollection Saral Dutta. B. Tech. Hons. I.I.T. Executive Director ISP RMD SAIL Retired Rolling is a metal forming process in which metal stock is passed through a pair of rolls. There are two types of rolling processflat and profile rolling. In flat rolling the final shape of the product is either

    Chat Online

  • The development of the theory of metal rolling and its

    2017 8 9   mill and control must be based. Rolling theory can be divided into two broad and general cate gories that which applies to hotrolling and that which applies to cold rolling. In hotrolling the yield stress characteristic of the metal is strain rate dependent and frictional force between the roll and stock is

    Chat Online

  • Unwind/rewind eccentricity control for rolling mills

    A method of controlling a rolling mill receiving material to be rolled from an unwind coil of the material which coil includes means for driving the same in a manner that maintains the material between the mill and coil in tension the unwind coil producing a cyclic disturbance in said tension the method comprising.

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  • Improving the Prediction of the Roll Separating Force in a

    2017 7 5   rolling mill products have led to great efforts to improve the control and automation systems of the rolling process 1 3 . Hot steel rolling is one of the most important steel manufacturing processes. Hot rolling is the first metal shaping process after the slab has been cast in

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  • Advanced Process and Quality Control in Hot Rolling Mills

    2007 11 2   The hot testing system consists of a water cooled testing head testing electronics and various software tools that together form a comprehensive fully automated system. It can be fully integrated in the mill control network. 4.1 Water Cooled Test Head The sensor is a robust water cooled test head through which the hot material passes

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  • Improvement of Accuracy for Gauge and Elongation

    2012 9 14   above control systems a desired elongation is realized by control ling the rolling force of the mill by a hydraulic screw down control system. 2.3 AEC for skin pass mill of continuous processing line 2.3.1 Conventional AEC methods and their problems In most cases an in line skin pass mill

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  • Improving the Prediction of the Roll Separating Force in a

    2017 7 5   rolling mill products have led to great efforts to improve the control and automation systems of the rolling process 1 3 . Hot steel rolling is one of the most important steel manufacturing processes. Hot rolling is the first metal shaping process after the slab has been cast in

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  • Rolling of hot strip and strip defectsIspatGuru

    2017 1 14   For rolling of hot strip the slabs are heated initially at 1100 deg C to 1300 deg C. The temperature in the last finishing stand of the hot strip mill varies from 700 deg C to 900 deg C. It is always to be above the upper critical temperature to produce uniform equiaxed ferrite grains.

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  • Modeling and control of a four high heavy plate rolling mill

    In heavy plate rolling the heated plates are plastically deformed by rolling mills. For this task reversing four high mill stands consisting of two work rolls and two backup rolls are often used. The plate is deformed between the two work rolls in several rolling passes. The high rolling forces during the deformation cause the work rolls to

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  • Roll Eccentricity Control Using Identified Eccentricity of

    Abstract. 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

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  • Hot Rolling Mill Hydraulic Gap Control HGC thickness

    2015 11 4   The hot rolling mill environment is quite harsh so the X ray thickness gauge is placed a few meters away from the roll gap. The dead time can be calculated from the distance between the work rolls and the thickness gauge l and the rolling speed v td= l / v . Considering approximately 2 m/s rolling speed the dead time can reach a few seconds. This amount of delay in a control loop makes accurate

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  • Rolling Technology and Theory for the Last 100 Years The

    At the time when the past basic research and development flowered development of many new type rolling mills with the crown shape control function were reported. 72 73 74 75 76 77 78 A pair cross rolling mill with a big effect of profile control for hot rolling mills was put to practical use 79 which became a standard rolling mill for the

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  • Strip Thickness Control of Cold Rolling Mill with Roll

    2013 11 12   In order to meet increasing demand for the high precision of strip thickness various types of Automatic Gauge Control AGC methods have been developed for hot or cold mill processes. The British Iron and Steel Research Association B1SRA AGC method based on the gauge meter principle and the feed forward AGC method using the delivery time of the strip have been widely utilized in steel rolling

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  • Rolling Mill TutorialControl System Design

    2001 2 26   Rolling Mill Tutorial. Before continuing make sure you have read Chapter 5. System Description. Another control problem besides the continuous caster arising in the steel industry is the control of the exit steel thickness in a rolling mill. The diagram below shows the layout of a rolling mill with thick steel going in one side and thin

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