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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
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.
Mill Vibration Phenomena during Cold Rolling. All machines vibrate during operation. However, only a few of these vibrations cause problems to the product or the machine itself. Typically, the most damaging vibrations involve a natural resonance of the machine which significantly increases the .
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 services.
Some Key Pre-processingTechnologies in Rolling Mill Vibration Monitoring LAI WUXING SHI TIELIN XUAN JIANPING YANG SHUZI School of Mechanical Science and Engineering Huazhong University of Science and Technology 1037 Luoyu Road,Wuhan, P.R.CHINA wxlai@tom Abstract: -In working environment of rolling mill, speed of rolling mill was changing ...
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 ...
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 ...
Asymmetrical rolling and self-excited vibration in a hot roughing mill. Torsional vibration of drive shafts, rolls, and vertical vibration of rolling mill ... 3-1992, "Asymmetrical Rolling and Hot Roughing Mill Vibrations", ASME Journal. Get Quote
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 ...
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].
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.
ROLLING MILL VIBRATION ANALYSIS PROJECTS (1987-2008) – including tension levellers CORUS - PORT TALBOT INTEGRATED WORKS - UK 5-stand tandem continuous cold mill A temper mill No.3 temper mill Hot strip mill, finishing stands Hot strip mill, reversing rougher Link Mill tension leveller CORUS - LLANWERN INTEGRATED WORKS - UK
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 ...
Vibration Based Condition Monitoring of. Rolling Mill. Vinod D.TIrpude, Jayant P.Modak, 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 ...
We specialise particularly in the solution of such problems in the metals industry and have many years in-depth experience in the analysis and solution of rolling mill and roll grinder chatter vibration. We have also developed a range of on-line monitoring systems for permanent application to such machinery.
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 .
6- 1993, "Non-linear Vibrations and Asymmetry in Coupled Tandem Hot Rolling Mills", ASME Conference on Mechanical Vibration and Noise, USA. 7-1993, "Asymmetrical Rolling and Self Excited Vibrations in a Hot Roughing Mill", ASME Conferenc e on Mechanical Vibration and Noise, USA.
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.
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 ...
Machine-Condition Monitoring using Vibration Analysis ... Analyzing the recorded vibration signals on the office-based analysis system. Mill ... ^ ° faults on the outer-race of a rolling-element located in the 200 to 500 Hz range, fault than detecting discrete rrequen- bearing. For further information on bearing
VALIGI, PAPI, Analysis Of Chattering Phenomenon In Industrial S6-High Rolling Mill 5 Since the start-up 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
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 ...
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
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.
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