Machine-Condition Monitoring using Vibration
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. ... The case stories that follow show how detailed vibration-analysis can be used to obtain a greater understanding of the ...
A provider of vibration and noise solutions to ...
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.
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. The results show that the rolling …
Active vibration suppression for rolling mills vibration ...
Rolling mill vibration is a coupling vibration among mechanical, electrical, hydraulic, and rolling interfacial subsystem. 5 Presently, vibration is mainly suppressed by adjusting rolling mill parameters by installing vibration dampers, 6 improving the quality of the grinding roll, 7,8 changing the emulsion lubrication characteristics, 9,10 or ...
Vibration characteristic analysis of twenty-high rolling ...
A detailed research is done about how the rolling parameters and the structural parameters affect vibration characteristics and the self-excited vibration based on the rolling mill dynamic model,, . The local defect on roll surface will produced easily by the high contact stress during long-term rolling process, and the local defect will ...
Stability analysis of the rolling mill multiple-modal ...
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 …
A Review on Chatter Analysis in Cold Rolling process
corporation production mill. The computer simulation have been used to study chatters and showed the variation of natural frequency with variety of factors viz. friction, rolling speed, tension, reduction and strip width. The stability criterion for rolling mill was derived analytically using the factors causing negative and positive damping [8].
Mechanical Vibration Analysis
condition during start-ups, shutdowns and normal operation. Vibration analysis is used primarily on rotating equipment such as steam and gas turbines, pumps, motors, compressors, paper machines, rolling mills, machine tools and gearboxes. Vibration analysis is used to determine the operating and mechanical condition of equipment. A
Vibration Analysis | IVC Technologies
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.
Chatter detection using principal component analysis in ...
Benhafsi Y. The use of vibration analysis tools to solve chatter problems on rolling mills and roll grinding machines. Proc. of Steel Rolling 2006, the 9th International and 4th European Conference, France, 2006.
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 ...
Vibration Instability in Rolling Mills: Modeling and ...
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 predict the maximum rolling speed without chatter instability on schedules from a 5 stand ...
Torsional Vibration for Rolling Mill with the Drive System ...
A rolling mill driving system is a multiple degree of a freedom torsional vibration system [].The torsional vibration of a driving system causes the rolling speed to change dynamically, providing instability factors at rolling interface and impacting the strip quality [2, 3].Therefore, it is necessary to explore the torsional vibration caused by the structural …
Rolling Mill & Grinder Chatter | IVC Technologies
We Provide Rolling Mill and Grinder Chatter Solutions. Today's global economy means aggressive competition and no manufacturer can afford quality issues such as Rolling Mill and Roll Grinder Chatter, Flutter, or Barring which result in increased conversion costs, lost production, and loss of customer confidence.Due to the complexity of the rolling and grinding …
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 …
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,
Multiple-Modal-Coupling Modeling and Stability Analysis of ...
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 ...
Nonlinear vibration characteristics and time-delayed ...
In the vibration analysis of rolling mill rolls, many theories and practices have shown that the rolling force is the key factor affecting the vibration of the system. It is directly related to the research and analysis of the vibration characteristics of rolling mill rolls regardless of whether modeling is reasonable [13, 14].
An analysis on strip vibration coupled with torsional ...
The results would provide a theoretical reference for control and analysis of rolling mill vibration in engineering practice. Keywords: strip vibration, main drive system, torsional vibration, continuous-discrete coupled vibration model, modified iteration method. 1. …
Prediction and analysis of cold rolling mill vibration ...
The vibration amplitude of the rolling mill in the stable rolling stage was analyzed by collecting the vibration data of the rolling mill under different rolling process conditions. Considering the mill vibration was a complex nonlinear problem, the machine learning algorithms were used to investigate the vibration phenomena in rolling mill.
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.
Vibration analysis and numerical simulation of rolling ...
Mill vibration often occurs in stand 4 and 5 because of the high rolling speed and deformation resistance [ 2 ]. It can be categorized into torsional, third-octave mode and fifth-octave mode chatter [ 3 ].
Fundamentals Of Noise Vibration Analysis For Engineers
Vibration analysis is used primarily on rotating equipment such as steam and gas turbines, pumps, motors, compressors, paper machines, rolling mills, machine tools and gearboxes. Vibration analysis is used to determine the operating and mechanical condition of equipment. A
CHATTER DETECTION USING PRINCIPAL COMPONENT …
always feasible. Some authors have used vibration measurement & analysis for chatter detection. At Arcelor Mardyck cold rolling mill, online chatter detection system is developed for third octave using vibration measurement at mill stands [13]. In reference [14] time varying kurtosis of vibration measurement is used for chatter detection.
Single-stand 4-high cold rolling mill. | Download ...
Yang et al. [3], for vertical vibration analysis of a cold rolling mill with four rolls, used a single degree of freedom vertical vibration system and for contact between work roll and backup roll ...
A Fault Diagnosis Method of Rolling Mill Bearing at Low ...
The parameters of the rolling mill are as follows: the diameter of roll is 120 mm, the length of roll is 90 mm, the rotation of main motor is 18 r/min, the maximum rolling force is 12 tons, the vibration sensor is YS8202 acceleration sensor, the pressure sensor model is HZC-01 to measure the rolling force, and the torque sensor model is BHF350 ...
Analysis of Chatter Vibration Phenomena of Rolling Mills ...
Abstract. Chatter vibration of a 4-hi rolling mill was studied by examining the step and frequency response that specific excitation produces in 3-D finite element analysis. Methods of suppressing ...
Vibration-Based Condition Monitoring of Rolling Mill - IJSER
Vibration Based Condition Monitoring of Rolling Mill V inod 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 …
Detecting critical vibrations in rolling mills - iba
In a cold rolling mill, the process data recording system ibaPDA has been used for process data analysis, but the vibration measurement data was evaluated separately. With ibaInSpectra as add-on to the ibaPDA system, …
Vertical–Horizontal Coupling Vibration of Hot Rolling Mill ...
The existing modeling and analysis of rolling mills have been conducted by considering a single-vibration direction, such as vertical vibration, horizontal vibration, or torsional vibration; this makes it impossible to accurately capture the characteristics of the rolling process and fully explain the complex phenomena that occur during vibration.