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octave chatter in a twostand tandem rolling mill. Online vibration monitoring system that was used has provided different acceleration signals from various components of the rolling stand. Acceleration signals have been analyzed by a vibration analysis toolbox. Frequency analysis and
Download Citation on ResearchGate | Spatial vibration of rolling mills | The analysis of rolling mill vibrations is usually limited to simple planar or low DOF vibrations. In reality, however ...
6 1993, "Nonlinear Vibrations and Asymmetry in Coupled Tandem Hot Rolling Mills", ASME Conference on Mechanical Vibration and Noise, USA. 71993, "Asymmetrical Rolling and Self Excited Vibrations in a Hot Roughing Mill", ASME Conferenc e on Mechanical Vibration and Noise, USA.
A heavyduty accelerometer in the gauge device will display the vibration frequencies and allow the user to determine which frequencies are due to actual thickness variations, roll eccentricity problems, and those that are due to vibration. These tools are available as part of our gauge systems or as standalone rolling mill tools and services.
A Review on Chatter Analysis in Cold Rolling process Asit Kumar Choudhary*, Vinay S Gujre and Rul Kumar Verma ... such as roll vibration, variation in strip tension and negative damping [1]. Chatters lead to thickness ... rolling mill was derived analytically using the factors causing negative and positive damping [8].
vibration analysis technique is very popular now days. In the present work vibration analysis of ball bearing is done by using FFT analyzer. ... gyroscopes, rolling mills and aircraft gas turbines. In general ball bearings are made of four different components, inner ring, outer ring, ball and cage. The cage
In this paper a horizontal vibration problem in strip rolling was studied; dynamic model was established; the mechanism of selfexcited vibration was analyzed. The main reason of surface quality of strip is selfexcited vibration. A vertical natural frequency and vibration mode of the rolling mill are obtained by finite element method. It lays the theoretic foundation for future researches on ...
Rolling mill system may lose its stability due to the change of lubrication conditions. Based on the rolling mill vertical–torsional–horizontal coupled dynamic model with nonlinear friction considered, the system stability domain is analyzed by Hopf bifurcation algebraic criterion.
The local defect on the roll surface of twentyhigh rolling mill is not only the main factor affecting the quality of steel strip but also generating abnormal vibration in rolling process. Local defects are usually very difficult to identify in the rolling process in real time, which is one of the existing difficult problems.
Vibration Analysis Reporting Bearing Failure Stages Responses. ... Example 1. A furnace combustion fan, which supplies billets to a rolling mill, is highly critical and a Stage 2 defect will require that planning begin to replace the bearing. ... Modern vibration analysis provides a means of identifying bearing faults, at various stages in ...
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.
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.
Jan 09, 2012· Statistical analysis of the rolling parameters during the vibration of the fivecell cold rolling mill was conducted by Makarov et al. . Brusa and Lemma analyzed the dynamic effects in compact cluster mills for cold rolling numerically and experimentally. Their research activity was aimed to assess an approach suitable to model the cold rolling ...
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. This problem motivates predicting the cluster mill dynamics by .
Vibration Based Condition Monitoring of. Rolling Mill. Vinod, Jayant, Girish D. Mehta. Abstract: All over the India, most of the processing industries are involved with rolling operations for steel and alloyed materials. To perform these operations, rolling mills are used. ... ‚Using vibration measurement and Analysis for ...
Mill chatter in tandem cold rolling mill is a major rejection to the quality and production of the strips. In most mill vibration models, either the roll mass is usually limited to vibrate in vertical direction and verticalhorizontal directions, or the multiple rolls system is simplified to a single mass system. However, the torsional chatter is also a typical type of mill chatter, and the ...
This is done by performing a mechanical torsional vibration analysis of the motor and load, a simulation of the drive speed response, and an electrical power system analysis. The automated rolling mill data is continuously monitored in the operators'' control room.
Nonlinear dynamic rolling forces in the vertical and horizontal directions are, respectively, established, considering the impact of vertical and horizontal directions vibration of rolls. Then a verticalhorizontal coupling nonlinear vibration dynamic model of rolling mill rolls is proposed, based on the interactions between this dynamic rolling force and mill structure.
VALIGI, PAPI, Analysis Of Chattering Phenomenon In Industrial S6High Rolling Mill 5 Since the startup of the plant a series of chatter marks, perpendicular to the rolling direction, compromising the aesthetically quality of the product was noted. The frequency of the skid marks was about two
In this paper, we propose a mathematical model of a cold rolling mill to predict chatter vibration. The mathematical model was verified by experiment and theoretical analysis. The chatter frequency predicted by the model was very similar to that determined by experiment and theoretical analysis.
We specialise particularly in the solution of such problems in the metals industry and have many years indepth experience in the analysis and solution of rolling mill and roll grinder chatter vibration. We have also developed a range of online monitoring systems for permanent application to such machinery.
Zheng et al. (2017) established a spatial vibration model of a sixhigh cold strip rolling mill based on multibody transfer matrix method, and demonstrated the vibration characteristics of the mill. Recently, several attempts have been made to analyze chatter characteristics in tandem rolling mills, especially the effect of friction on vibration.
Vibration Analysis Executive Summary Vibration is increasingly becoming a problem as machine speeds have increased and paper quality requirements have risen along with increased competition. Balance grade G1 is requested and more time is spent on balancing the rolls in the machine. However, by balancing, mills typically measure only the
comparing with the` standard mill signal and a simultaneous analysis. 2. Measurement of vibration in a rolling mill stand Figure 2 presents the results of gage chatter on a 4th stand cold rolling mill in terms of roll stand vibrations. We see an intense increase of oscillations in the .
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