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Vibration-Based Condition Monitoring of Rolling Mill

In the present paper Rolling Mill -2 is considered. As this Rolling Mill is older therefore defects such as a) looseness of fasteners and belts, b) mis-alignment of parts, c) wear out of the components such as gear teeth, bushes, couplings and bearings are observed during inspection, which are frequently occurred.


Vertical Vibration Characteristics of Strip Rolling Mill ...

ing, which can prevent chattering during high-speed cold rolling effectively. Wang et al.11) studied the rolling mill system dynamics of the unstable lubricating state of the gap between two rolls during the rolling mill operation. And analyzed the corresponding distributions of the fric-tion and pressure with varying surface roughness and time


1994 Asymmetrical rolling and self-excited vibration in a ...

ROLLING MILL VIBRATIONS 1 1.1 Introductio 2 n 1.2 Torsiona 3 l chatter 1.2.1 Introductio 3 n 1.2.2 Torqu (TAF) 4 e amplification factor 1.2.3 Backlas 5 h 1.2.4 Torsiona in hot rolling 6 l vibration 1.2.5 Torsiona in cold rolling 14 l vibration 1.3 Vertica 16 l vibration 1.3.1 Introductio 16 n 1.3.2 Stri and damping 1p stiffness 6


A Review on Chatter Analysis in Cold Rolling process

An undesirable mechanical vibrations defect occurs during common process of cold rolling operation known as chatter. This happened due to numerous discrepancies occurring during manufacturing process, such as roll vibration, variation in strip tension and negative damping [1]. Chatters lead to thickness


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,


Mill Vibration Phenomena during Cold Rolling - Innoval ...

Mill Vibration Phenomena during Cold Rolling. All machines vibrate during operation. However, only a few of these vibrations cause problems to the …


vibration problems in roller mills of power plant - BINQ ...

Mill vibration during cold rolling – Innoval Technology Ltd … types of cold mill vibration that can cause problems during the rolling of steel and aluminium sheet, including third octave and fifth octave chatter. »More detailed


Rolling of Metals - University of Rhode Island

• Dimensional tolerances for cold-rolled sheet thicknesses +/- 0.1 mm to 0.35 mm (0.004 to 0.014 inch) • Flatness tolerances to within +/- 15 mm/m (3/16 inch/foot) for cold rolling, +/- 55 mm/m (5/8 inch/foot) for hot rolling • Hot rolling and …


Danieli Wean United - Flat Product Rolling Mills and Strip ...

Flat Product Rolling Millsand Strip Processing Lines. The reliable and innovative partner for design and construction of advanced hot and cold rolling plants, and processing lines. 9/27. Vision. History. Milestones. Business units. …


Vibration Reduction in a 5 Stand Cold Mill

Vibration Types The complex nature of a five stand cold mill prevents the discussion of all steps performed to date to improve performance. We will discuss three basic types we encountered as we began to increase mill speeds: Rumble, Third Octave and Fifth Octave: Rumble Vibration occurring near 100 Hz was encountered during acceleration


Cold rolled sheet (roll) common defects, characteristics ...

Due to inclusions in the molten steel during steelmaking, or scratches, chisel marks, etc. on the surface of the steel strip during hot rolling, when cold rolling, a spot-like trace is formed on the surface of the steel strip. Rolling in dirt. …


Introduction to Rolling Process - Cambridge University …

2 Principles and Applications of Metal Rolling (ii) Shape of the rolled product- flat, sections or hollow sections rolling. (iii) Direction of rolling- lengthwise, transverse, and skew rolling. (iv) Mode of rolling mill operation- continuous (unidirectional), and reverse rolling, where direction of rotation of rolls are reversed. When two rolls of equal diameter and with axis lying …


THE STUDY OF INFLUENCE OF WORK ROLLS VIBRATION …

strip thickness formation during cold rolling. The pa-pers [10, 11] show the efficiency of numerical computer simulation of the cold rolling process during work rolls vibration. Therefore, it is highly relevant to continue studying the influence of work rolls vibration on strip elastoplastic deformation during cold rolling and its surface quality.


Vibration Instability in Rolling Mills: Modeling and ...

AbstractModels 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 schedule. In particular, a stability criterion for the critical rolling speed is used to ...


Numerical Simulation and Parameter Design of Strip Cold ...

Gong et al. made a numerical simulation of the roll vibration during the cold rolling in 6-roll mill, and through the analysis of the results, it was considered that the vibration had the minimum value when the rolling speed was 25 m/s. With the further improvement of the flatness standard on the market, as the most mature high-precision cold ...


CONTROL PROCESS FOR A COLD ROLLING MILL BY …

most important parts of cold rolling mills. This phenomenon causes severe damage for the mill machine and strip quality (Fig. 1). Fig. 1. Strip faults, due to rolling mill vibration The integrated control process is made to analyse the vibrations which are produced on the work roll chocks and backup roll chocks.


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 ...


Prediction and analysis of cold rolling mill vibration based …

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 ...


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

Abstract 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 stand.


(PDF) Chatter in steel rolling - ResearchGate

The tandem cold mill vibration known as chatter or rumble is a rolling phenomenon occurring in mills throughout the world. It affects the very cornerstones of an operation; quality and product ...


Vibration Analysis of Steel Strip in Continuous Hot-Dip ...

tion during cold rolling. Mi t al. e. [6] investigated the variation characteristics of the mill and confirmed the vibration order by analyzing and comparing the vibration signal during the rolling cycle. Hardwicka [7] proposed a simple, instrumented method for obtaining an objective measurement of the actual depth of any marks in the roll


Principles and Applications of Metal Rolling

3.2.6 Rolling of non-ferrous metals and alloys 143 3.2.7 Cold rolling of sheet, strip and foil 146 4. Rolling Equipment and Systems 168 4.1 Mill Stand Components and Mechanisms 168 4.1.1 Rolling mill rolls 169 4.1.2 Roll neck bearings …


An investigation on the roll force and torque fluctuations ...

the same time, the increased running speed brings out possible vibration problems in the rolling process, especially in a cold strip mill. If the thickness variation of the hot-rolled aluminum strip can be reduced, it will be possible to increase the production speed of the cold strip mill. These claims set new demands on the acceptable rolling


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 …


GENERAL ASPECTS OF ROLL COOLING FOR HOT & …

rolling mill, dedicated roll cooling systems are required to fulfill the required functions. Examples are suitable roll cooling and lubricationsystems to fully utilize the advantages of HSS rolls in hot strip mills, and selective roll cooling systems as a method to control the flatness of the strip in cold rolling mills.


Vibration analysis and numerical simulation of rolling ...

Cold rolling plays a crucial role in flat steel production. In recent years, it has become extremely difficult to ignore the existence of chatter, also called "ghost vibration" by operators who work in milling plants [], which restricts the quality and efficiency of strip production.Fig. 1 shows the layout of a tandem cold rolling process. Mill vibration often occurs in stand 4 and 5 ...


Torsional Vibration Analysis of Drive System for 6-High ...

The torsional vibration model of main drive system for 6-high cold rolling mill was established. Calculation formula of torque amplification factor (TAF) of main drive system was put forward when the clearance exists or not. The TAF-curve, changing by the biting time of blank, was drawn, and whether torsional vibration could cause mechanical failure in weak link of main drive …


Experimental and Numerical Investigation of the …

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


(PDF) VIBRATION MONITORING OF TANDEM MILLS AT …

The Arcelor T illeur cold rolling mill. has a 5-stand tandem mill that is prone to 3 rd order chatter and a. 4-stand tandem that is subject to 5 th order chatter. The. …