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How To Control Eccentricity Problem In Hot Rolling Mill

How To Control Eccentricity Problem In Hot Rolling Mill

then the process is termed as hot rolling. The hot mills using plain rolls were already being employed by the end of the seventeenth century. But the industrial revolution in the nineteenth century saw a new horizon in ... Roll Eccentricity Control Methods Passive roll eccentricity control methods Active roll eccentricity control methods

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How To Control Eccentricity Problem In Hot Rolling Mill

  • The Complete Technology Book On Hot Rolling Of Steel

    then the process is termed as hot rolling. The hot mills using plain rolls were already being employed by the end of the seventeenth century. But the industrial revolution in the nineteenth century saw a new horizon in ... Roll Eccentricity Control Methods Passive roll eccentricity control methods Active roll eccentricity control methods

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  • Roll Eccentricity Compensation Based On Antialiasing

    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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  • Rolling Mill Strip Thickness Controller John Lysaght

    Method and apparatus for eccentricity correction in a rolling mill: 1978-11-21: Smith, Jr. et al. 72/11: 3543549: ROLLING MILL CONTROL FOR COMPENSATING FOR THE ECCENTRICITY OF THE ROLLS: 1970-12-01: Howard: 72/8

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  • Us5701774a Control Device For A Continuous Hotrolling

    A control device for the purpose of achieving highly precise rolled material. The response and robust stability of the rolled material tension and looper height are specified, and a controller is designed so that the rolling mill main motor and looper operate in concert to suppress variations in rolled material tension, thereby achieving stable optimum control which is responsive to the ...

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  • Non‐Linear Optimal Control For The Hot‐Steel Rolling Mill

    Abstract: Control of hot-steel rolling mills aims at raising the levels of quality of the related industrial production and at minimising the cost of the electric energy consumed by such industrial units. This paper proposes a non-linear optimal control approach for the hot-steel rolling mill system.

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  • Roll Eccentricity Phase Identification System Scientificnet

    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.

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  • Noncircular Grinding Of Backup Rolls To Reduce Rolling

    The steel mills built in the 1960s and 1970s and even later are looking for cost-effective means to meet the new demands. This study discusses a method of reducing the force variation in the milling stand. Typically a rolling mill consists of 1–7 rolling stands. There are usually two, three or …

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  • A Review On Chatter Analysis In Cold Rolling Process

    Sources of chatter in rolling mill Table 1: Chatters reasons. S.No Reasons of Chatters 1 Due to problems in drive systems: Misalignment of gears (Excitation proportional to speed)Tooth engagement, Gear defects 2 Roll ripples/ Unbalance or eccentricity of rolls/ Speed of rolls 3 Periodic grinding of rolls 4 Friction conditions lead to excitation

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  • Lqg Regulation Rolling Mill Case Study Matlab Amp;

    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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  • Metallurgy Of Rolling Mill Rolls Ispatguru

    Nov 13, 2019 Metallurgy of Rolling mill Rolls. Rolls are implements or tools used in rolling mills to reduce the cross section of the material being rolled. They are highly stressed tools and are subject to wear. They are needed both for the rolling of sectional as well as flat products. In recent past, rolling technology has improved and changed ...

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  • Rolling Process Working Application Defects Type Of

    Definition of Rolling process: Rolling is defined as a process to form metals where the metal strip is pressed by two or multiple rollers, thus the uniform thickness is formed. To do this, the temperature is essential. There are two types of processes. One is Hot rolled and another is Cold Rolled.

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  • The Engineering Design Of Rolling Mill Aamp;L Alluminio E Leghe

    Oct 04, 2019 A 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 …

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  • Thickness Control For A Steel Beam Matlab Amp; Simulink

    Rolling Stand Model. Figures 1 and 2 depict the process of shaping a beam of hot steel by compressing it with rolling cylinders. Figure 1: Beam Shaping by Rolling Cylinders. Figure 2: Rolling Mill Stand. The desired H shape is impressed by two pairs of rolling cylinders …

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  • Multiresolution Wavelet Method For Roll Eccentricity

    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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  • Process And Disturbance Models Design Case Studies

    Eccentricity in the rolling cylinders Feedback control is necessary to reduce the effect of these disturbances. Because the roll gap cannot be measured close to the mill stand, the rolling force is used instead for feedback. The input thickness disturbance is modeled as …

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  • The Complete Technology Book On Hot Rolling Of Steel

    then the process is termed as hot rolling. The hot mills using plain rolls were already being employed by the end of the seventeenth century. But the industrial revolution in the nineteenth century saw a new horizon in ... Roll Eccentricity Control Methods Passive roll eccentricity control methods Active roll eccentricity control methods

    Read More
  • Fault Diagnosis Of Roll Shape Under The Speed

    find both eccentricity magnitude and eccentricity location in the roll as shown in Fig.10. But, as shown in Fig.12, not only magnitude of eccentricity but also location of eccentricity in the roll is obtained. 4.2 Simulations with Field Data Fig.13 shows a simplified multi-stand hot rolling system. The rolling system consists of seven stands.

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  • Roll Eccentricity Compensation Based On Antialiasing

    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 ...

    Read More
  • Temperature Control In Hot Strip Mill General Electric

    These strategies are well known and are described, for example, in Automatic Shape Control-- Hoogoven's 88--In. Hot Strip Mill by F. Hollander and A. G. Reinen, Iron and Steel Engineer, April, 1976. Strip flatness control will be improved where the rolling force at each stand is maintained more nearly constant throughout the strip length.

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  • Hot Rolling Practice An Attempted Recollection

    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 …

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  • A Review On Chatter Analysis In Cold Rolling Process

    Sources of chatter in rolling mill Table 1: Chatters reasons. S.No Reasons of Chatters 1 Due to problems in drive systems: Misalignment of gears (Excitation proportional to speed)Tooth engagement, Gear defects 2 Roll ripples/ Unbalance or eccentricity of rolls/ Speed of rolls 3 Periodic grinding of rolls 4 Friction conditions lead to excitation

    Read More
  • Loopergauge Integrated Control In Hot Strip Finishing

    control is a complex integrated problem. The conventional PI control strategy is widely used in the above control processes, but the dynamic relations between them are not effectively considered. With the increasingly demand to improve strip thickness and operation stability, the devel-opment of advanced control in hot finishing mill control is ...

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