mill vibration during cold rolling

Chapter Cold-Rolling Mill Vibration and Its Impact on ...

This chapter describes the common types of mill vibration that can be experienced during the cold rolling of steel and aluminum. Two main problems are

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Model for the solution of metal rolling mill vibration ...

In common with other rotating machines, rolling mills are prone to many different vibrations during rolling and most do not cause a problem. However, there are several types of rolling mill vibration that can have a significant impact on the quality and/or productivity of the cold rolling process.

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CHATTERBLOCK CHATTER VIBRATION IN COLD ROLLING*

and 150Hz, is a self-excited vibration phenomena typically occurring in the rear stands of tandem cold mills. It can produce significant gauge variations and even cause strip breaks. 3rd octave mill chatter is characterized by a quickly diverging vertical vibration of the rolls for specific rolling conditions (material, mill speed, forces,

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Working-Stand Equipment Vibrations of Continuous Cold ...

Apr 10, 2020  The article considers the nature, occurrence mechanism and development of resonant vibrations found in the working stand equipment of cold rolling mills during the production of strips with a thickness of 0.4–0.6 mm at speeds of more than 12 m/s. Vibration causes are possibly based on changes in the metal properties during rolling due to acquired hardening and forming of internal

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Vibration Characteristics of Rolling Mill System under ...

Jan 19, 2021  The vertical vibration mechanism of cold rolling mill is studied under the influence of the dynamic friction mechanism between the workpiece and roll. Fan et al. introduced the Duffing oscillator and the parameters of the excitation system and established the roll system vertical vibration model . The bifurcation characteristics of the rolling ...

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SMS group GmbH: Active chatter damping for cold rolling mills

Aug 14, 2018  Mill vibrations (chatter) especially occurring at high rolling speeds affect product quality of the cold-rolled material and thus lead to yield losses and quality issues. Among other supportive measures active chatter damping has turned out to be an effective approach to counteract these problems by significantly reducing vibration issues of ...

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Effect of minimum friction coefficient on vibration ...

Jul 01, 2021  Tandem cold rolling mills are key pieces of equipment in the iron and steel-making industry. Taking a tin-plate steel-strip production line as an example, Fig. 1(a) shows the basic rolling process of a universal crown control mill (UCM). The production line contains five tandem stands, and all strips are rolled in the five-pass process stage.

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Study on vibration characteristics of rolling mill based ...

The vertical vibration often occurs during the rolling production, which has an influence on the accuracy of rolling mill. In order to effectively suppress the vertical vibration of the rolling equipment, the rolling mill model with vibration absorber device was established. Based on the main resonance singularity of the rolling mill system, the best combination of opening parameters was obtained.

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Optimization of cold rolling process parameters in order ...

Statistical analysis of the rolling parameters during the vibration of the five-cell cold rolling mill was conducted by Makarov et al. [7]. Brusa and Lemma [8] analyzed the dynamic effects in ...

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Prediction and analysis of cold rolling mill vibration ...

Mill chatter is one of the most common problems in cold rolling. Thus, it is important to investigate the mill chatter phenomenon to ensure a high-speed and stable rolling process. The traditional mill chatter mechanism model cannot meet the monitoring and rapid diagnosis needs of the rolling

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Vibration Instability in Rolling Mills: Modeling and ...

Mar 26, 2002  Models for the occurrence of the vibrational instability during rolling known as third octave chatter are presented and discussed. An analysis of rolling mill chatter was performed for the purpose of identifying characteristics of the vibrations and to determine any dependency on the rolling

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Vibration analysis and numerical simulation of rolling ...

Vibration analysis and numerical simulation of rolling interface during cold rolling with unsteady lubrication. ... In this work, vertical vibration speed is introduced into the Kármán equation. An unsteady lubrication model considering entraining and squeezing effect is proposed. ... Cold rolling mill. Chatter.

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Influence of Rolling Lubrication for Self-Excited ...

On account of the self-excited vibration in No. 5 stand of 1420 cold rolling mill, the relationship between rolling lubrications and self-excited vibration of rolling mill was theoretically studied. The self-excited vibration in No.5 stand of the mill was restrained by optimizing the lubrication technical parameters, and the critical stabilized rolling speed was increased from650 m/min to ...

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Cold rolling on a 4 hi reversible mill - SlideShare

Nov 22, 2013  Packing 1. Raw Material slitting A Cold Rolling Mill, is typically a Sendzimer type mill and is PLC controlled. CRM’s may be 4 Hi Reversible Mill or 8 Hi reversible. A 4 Hi mill, consists of two work rolls and two back up rolls and rolling operations can be reversed, hence the nomenclature. Sendzimer is a generic name and it may have been ...

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Detecting critical vibrations in rolling mills - iba

Jun 13, 2019  Cold rolling mills show a complex vibration behavior, consisting of natural vibrations of the plant mechanics as well as excitations from the drive or bearings but also vibrations caused by defects. The aim of the monitoring is to detect vibrations

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THE VIBRATION OF COLD ROLLING MILL F5 UNDER MULTI

THE VIBRATION OF COLD ROLLING MILL F5 UNDER MULTI-SOURCE EXCITATION. 1. 2. Serious vibration occurred on the F5 stand when producing thin strips on a 1550 cold tandem mill. The field test showed that the dominant frequency of the vibration is 144

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CHATTERBLOCK CHATTER VIBRATION IN COLD ROLLING*

and 150Hz, is a self-excited vibration phenomena typically occurring in the rear stands of tandem cold mills. It can produce significant gauge variations and even cause strip breaks. 3rd octave mill chatter is characterized by a quickly diverging vertical vibration of the rolls for specific rolling conditions (material, mill speed, forces,

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(PDF) VIBRATION MONITORING OF TANDEM MILLS AT THE

Mill vibration during cold rolling. February 2007. T. Farley; In common with other rotating machines, rolling mills are prone to many different vibrations during rolling and most do not cause a ...

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(PDF) Regenerative chatter vibrations control in the ...

Chatter vibrations were investigated for the high speed 5 stand 4-h tandem cold rolling mill 2030 of the NLMC. Real-time chatter vibration monitoring and diagnostics system was developed and ...

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(PDF) Active vibration suppression for rolling mills ...

The exceptional vibration phenomenon of the F2 stand in two stand reversing cold mill while rolling results in cross striations on the surfaces of sheet steel and backup roll.

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Study on vibration characteristics of rolling mill based ...

The vertical vibration often occurs during the rolling production, which has an influence on the accuracy of rolling mill. In order to effectively suppress the vertical vibration of the rolling equipment, the rolling mill model with vibration absorber device was established. Based on the main resonance singularity of the rolling mill system, the best combination of opening parameters was obtained.

More

Vibration Instability in Rolling Mills: Modeling and ...

Mar 26, 2002  Models for the occurrence of the vibrational instability during rolling known as third octave chatter are presented and discussed. An analysis of rolling mill chatter was performed for the purpose of identifying characteristics of the vibrations and to determine any dependency on the rolling

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Chatter in Cold Rolling - ScienceDirect

Jan 01, 1982  A basic theory of chatter in. cold rolling is presented which is based on the effect of the variable scrip tension on the rolling force as well as on the variations of contact length The structure of a computer program simulating chatter of a tandem mill is presented and examples given of the effect of rolling speed, strip width, coefficient of friction and of using a tuned damper.

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1. Hot rolling and rolling defects: 1.1 Front and back ...

Oils, soap emulsions, fatty acids are used as lubricants during hot rolling non-ferrous metals. Mineral oils, paraffin, fatty acids are used for cold rolling. Normally, foe ferrous alloys no lubricant is used. 1.7 Rolling mill control: Production of continuous sheets and strips is one of the attractive features of modern rolling mills.

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811. Frequency analysis of chatter vibrations in tandem ...

which the vibration frequency is usually in the range of 100-250 Hz, often occurs in cold rolling of thin strips. The main feature of this chattering is that the strip thickness greatly fluctuates.

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Effect of Friction on Tandem Cold Rolling Mills Chattering

Effect of Friction on Tandem Cold Rolling Mills Chattering ... stabilize chatter vibration in tandem rolling mills. They ... during computations under steady-state conditions. 3. Methodology

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Research Article Multiple-Modal-Coupling Modeling and ...

Cold Rolling Mill Vibration LingqiangZeng,YongZang,andZhiyingGao ... During the vibration of rolls, the volume of the roll bite changes simultaneously. Considering the control vol-

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Maintenance Of Cold Rolling Mill - Cold-Rolled Ribbed ...

Many customer will only use cold rolling mill, but forget to make routine maintenance of cold rolling mill equipment during usage process. So for life and long-term operating efficiency of the cold rolling mill, it does not do any good.Maintenance of cold rolling mill is related to production quality and equipment life, so during the repair and maintenance work of cold rolled ribbed machine,it ...

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Detecting critical vibrations in rolling mills - iba

Jun 13, 2019  Cold rolling mills show a complex vibration behavior, consisting of natural vibrations of the plant mechanics as well as excitations from the drive or bearings but also vibrations caused by defects. The aim of the monitoring is to detect vibrations

More

Analysis of Vibration for Sendzimir Mill in Cold Rolling ...

May 29, 2009  In order to clarify the vibration phenomenon in the Sendzimir mill, two simulation models were developed to calculate the natural frequencies of Sendzimir mill vibration, and the frequencies of mill vibration during the cold rolling of stainless steel strip were measured. Two distinct vibration modes were found to be nealy 700 Hz.

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Experimental and Numerical Investigation of the Vibration ...

3.1. Vibration Measurement of the Rolling Mill The cold rolling process is usually conducted with a workpiece that is initially at room temperature. A schematic illustration of the 6-high cold rolling mill is shown in Fig. 1.11) The stands are arranged to produce a sequential reduc-tion in the thickness of the strip. Work rolls are the tools

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THE STUDY OF INFLUENCE OF WORK ROLLS VIBRATION

elastoplastic deformation during cold rolling and its surface quality. MODEL DESCRIPTION In order to reveal the mechanism of defects occur-rence on the surface of steel cold rolled strips during work rolls vibration, the finite element method imple-mented in the DEFORM-2D program was used. The 4th stand of the 5-stand mill 1700 of PAO Severstal ...

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Vibration analysis of a Sendzimir cold rolling mill and ...

Dec 09, 2009  The presence of several rolls in cluster cold rolling mills makes on-line vibration monitoring and failure analysis difficult. The dynamic behaviour of rolls strongly depends on the rolling pressure in the roll bite. Strip vibration applies a dynamic component on the rolling force acting on the work roll and may excite the resonance of the mill ...

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Investigation of the cause of the chatter and physical ...

Oct 05, 2017  Farley TWD, Rogers S, Nardini D (2006) Understanding mill vibration phenomena. In Proc. of the Int. Conf. “Vibration in rolling mills”. Inst. of Materials, Minerals and Mining, London. 7. Heidari A, Forouzan MR (2013) Optimization of cold rolling process parameters in order to increasing rolling speed limited by chatter vibrations.

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Rolling mill chatter mechanism based on the unsteady ...

The unsteady lubrication is one of the major causes for self-excited vibration in rolling. But it is difficult to build a rolling chatter model which considers the unsteady lubrication state in roll bite. Using the regression exponential function model of rolling friction coefficient, a dynamic rolling process model was built. Coupling the dynamic rolling process model with a mill stand ...

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Review on cold rolling mill roll deformation Engineering ...

Review on cold rolling mill roll deformation. Download. Related Papers. COMPARISON OF ROLL DEFORMATION IN 4HI ROLLING MILL AND 20 HI ROLLING MILL DUE TO THERMAL STRESSES, OVERLOADING, SPALLING AND DESIGN PARAMETERS. By IAEME Publication.

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Precision Alignment Critical to Metal Rolling Mill Success

Feb 05, 2020  Faulty rolling direction Excessive vibration and chatter Premature component wear and failure – rolls, bearings, chocks ... Equipment verification and alignment during installation, component changes, or upgrades ... With hot rolling mills processing more tonnage than any other manufacturing process and cold rolling mills processing the most ...

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1. Hot rolling and rolling defects: 1.1 Front and back ...

Oils, soap emulsions, fatty acids are used as lubricants during hot rolling non-ferrous metals. Mineral oils, paraffin, fatty acids are used for cold rolling. Normally, foe ferrous alloys no lubricant is used. 1.7 Rolling mill control: Production of continuous sheets and strips is one of the attractive features of modern rolling mills.

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A brief history of metal rolling for sheet and plate ...

A brief history of metal rolling for sheet and plate products. On the first day of our Aluminium Rolling Technology Course I run a session entitled “Machinery and Process Overview”. Part of this covers the history of metal rolling from the first known drawings of a mill to the state-of-the-art rolling

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Rolling process and its influence analysis on hot ...

Nov 09, 2016  Rolling mill vibration is a worldwide problem, although it has been found that the mill structure defects are the main cause of vibration, but the inhibition measures are difficult to implement. So we discussed the rolling force parameters influence on rolling mill vibration and suppression measures from rolling technology in this article. The results show that the rolling force is increased ...

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(PDF) Vertical Vibration Model for Unsteady Lubrication in ...

Vertical Vibration Model for Unsteady Lubrication in Rolls-Strip Interface of Cold Rolling Mills. Liza Horobets. Download with Google Download with Facebook. or. Create a free account to download. Download Full PDF Package. This paper. A short summary of this paper.

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A Study on the Performance of Rolling Oil During Cold ...

Jul 19, 2013  A steel rolling mill customer had requested us to develop a rolling oil to roll stainless steel in a new 3-stand 18-high rolling mill and demonstrate its performance on an experimental set up. The present paper describes the methodology adopted to assess the suitability of a rolling oil for the particular rolling mill.

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