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Characteristic recognition of chatter mark vibration in a ,

Jun 14, 2014 0183 32 Abstract Detecting chatter mark vibration in rolling mills operating under normal working conditions is difficult A novel characteristic recognition method of chatter mark vibration, where the non-dimensional parameters are calculated with time varying signals and kurtosis under normal rolling mill operating conditions, is presented in this paper...

Vibration characteristic analysis of twenty

The local defect on the roll surface of twenty-high 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...

Spatial vibration characteristics of six

rolling mill are not correct The modified Riccati-overall multi-body transfer matrix method is developed based on a multi-body transfer matrix method studied by Rui et al 19 A complete spatial vibration characteristic analysis of a 6-h mill will be presented in this paper Spatial vibration characteristics analysis of a 6-h mill based on ....

Rolling process and its influence analysis on hot ,

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...

Stability Analysis of a Nonlinear Coupled Vibration Model ,

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 vertical-horizontal 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 ....

Vibration Analysis Reporting

Vibration Analysis Reporting - Bearing Failure Stages Respons , 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 ....

Analysis of Vertical

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 vertical-horizontal coupling nonlinear vibration dynamic model of rolling mill rolls is proposed, based on the interactions between this dynamic rolling force and mill structure...

Vibration Based Condition Monitoring ofRolling Mill

Vibration Based Condition Monitoring of Rolling Mill V inod DTIrpude, Jayant PModak, Girish D Mehta Abstract All over the India, most of the processing industries are involved with rolling operations for steel and alloyed materials , Vibration Based Condition Monitoring ofRolling Mill ....

Chatter problems on a cold rolling mill

This type of speed-dependant vibration will be a mechanical forced vibration within the rolling mill, for example due to a defective gear or bearing Hence, the team collected data for all potential sources of forced vibration Careful analysis of the vibration data ,...

Vibration Instability in Rolling Mills Modeling and ,

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 schedule...

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...

Dynamic modeling and numerical analysis of a cold rolling mill

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...

Sleeve Bearing Problems

Sleeve Bearing Problems - Sleeve bearings are in some ways much more forgiving and easier to analyze than rolling element bearings since there are no fundamental defect frequencies and the like to analyze However, sleeve bearings also demand different techniques and insights that do not apply to rolling element bearings For instance...

Rolling Mill Analysis sentekcorp

A heavy-duty 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 stand-alone rolling mill tools and servic...

Vibration analysis of Sendzimir cold rolling mill and ,

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 ....

MONITORING OF THE ROLLING MILL VIBRATION

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 ,...

Minneapolis Minnesota Vibration Analysis and CBM services

Vibration Analysis is a key component of a solid Condition Based Monitoring program and is often referred to as Predictive Maintenance When applied to industrial or maintenance environments, Vibration Analysis aims to reduce costs and downtime by detecting equipment faults...

Beyond PdM Programs to Modal Analysis

Beyond PdM Programs to Modal Analysis by Doug Waetjen UE Systems, Inc , As a test, the facility implemented a set of universal joints in one of its rolling mill Almost immediately, the inspector noted a 50 percent drop in vibration on that stand and close to a 25 percent drop in the vibration of each adjacent stand, the one downstream and ....

Home IVC Technologies Vibration Analysis, Infrared ,

We are the only company in the United States hosting Vibration Analysis Level 1 and 2 courses which are taught by an ASNT PdM Level III certificate holder endorsed in both Vibration Analysis and Thermal/Infrared We are the only company in the United States with an on-site training center that includes dynamic equipment in our mill test lab area...

Vibration Condition Monitoring SEA Stan Engineering

Solution Rolling Mill Chatter Multi-Channel Trending, Sound, Torque f n Natural Frequency Modal Examples Figure No6 Figure No 6 Sound Acoustics with correlation to vibration signatures to determine root cause and solution...

Published May 10, 2011 Vibration Analysis

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...

A Review on Chatter Analysis in Cold Rolling process

A Review on Chatter Analysis in Cold Rolling process Asit Kumar Choudhary , Vinay S Gujre and Rahul 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...

Dynamic analysis of vibration stability in tandem cold ,

Zheng et al 2017 established a spatial vibration model of a six-high cold strip rolling mill based on multi-body 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...

Research on the Vibration of Rolling Mill

In this paper a horizontal vibration problem in strip rolling was studied dynamic model was established the mechanism of self-excited vibration was analyzed The main reason of surface quality of strip is self-excited 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 ....

Shock and Vibration

An effective dynamic model is the basis for studying rolling mill vibration Through analyzing characteristics of different types of vibration, a coupling vibration structure model is established, in which vertical vibration, horizontal vibration, and torsional vibration can be well indicated In addition, based on the Bland-Ford-Hill rolling force model, a dynamic rolling process model is ....

Vibration Analysis of Chatter in Cold Rolling Mill

In order to study the influence of tension and friction on rolling speed, two stands tandem systems based on two degrees of freedom vibration model are investigated The following findings were obtained 1 As the rolling speed increases, rolling mill vibrations become less stable...

Vibration analysis of a Sendzimir cold rolling mill and ,

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 ,...

Spatial vibration of rolling mills

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 ....

811 Frequency analysis of chatter vibrations in tandem ,

octave chatter in a two-stand 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...

Stability analysis of the rolling mill multiple

Considering the unstable oscillation in the rolling process caused by the lubrication conditions change, a dynamic rolling process model considering the nonlinear friction is built using the Bland-Ford-Hill rolling force model In addition, based on the structure model which can characterize the coupling vibration of rolling mill, and taking the dynamic variations of rolling force and rolling ....

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