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This study proposes a rolling mill fault diagnosis approach utilizing multi-sensor data, guided by multi-scale impact characteristics and dual attention …
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First, a novel rolling mill vibration monitoring method based on mill vibration and rolling process data was developed for a tandem cold rolling mill. Second, support vector regression, a neural-network-based method, and an extreme gradient boosting method were applied to predict the mill vibrations based on a data-driven …
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As large vertical mill always works in severe conditions, the on-line monitoring, timely fault diagnosis, and trend prediction are very important guarantees for the safe service and saving ...
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The vertical vibration of the rolling mill caused by the large reduction ratio and high rolling speed reduces the qualification rate of strip products, and even damages the rolling equipment ...
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Rolling mill multi-row bearings are subjected to axial loads, which cause damage of rolling elements and cages, so the axial vibration signal contains rich fault character information. The vertical shock caused by the failure is weakened because multiple rows of bearings are subjected to radial forc …
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This study establishes a vertical–horizontal coupling vibration model of hot rolling mill rolls under multi-piecewise nonlinear constraints considering the piecewise nonlinear spring force and piecewise nonlinear friction force constraints of the hydraulic cylinder in the vertical direction of the rolls, the piecewise stiffness constraints in the …
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The frequency at which the vibration occurs indicates the type of fault. That is, certain types of faults "typically" occur at certain frequencies. By ... produces a radial vibration, that is, part vertical and part horizontal. Because the machine is usually more flexible in the horizontal plane, excessive horizontal ...
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Mill fault and mill abnormal vibration experiments were carried out in our laboratory to validate the diagnostic performance of the suggested approach. ... Two excitation exciters are used to simulate horizontal vibration and vertical vibration, and the excitation frequency of the excitation exciter is adjusted by the oscilloscope. To obtain ...
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DOI: 10.1115/1.4037138 Corpus ID: 126226611; Hopf Bifurcation Control for Rolling Mill Multiple-Mode-Coupling Vibration Under Nonlinear Friction @article{Zeng2017HopfBC, title={Hopf Bifurcation Control for Rolling Mill Multiple-Mode-Coupling Vibration Under Nonlinear Friction}, author={Lingqiang Zeng and Yong Zang …
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Having problems when performing milling? Vibration issues, chip jamming, un-satisfactory surface finish? Explore our milling troubleshooting tips.
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Vibration analysis can often pinpoint a failing element of a rotating machine in time to avoid catastrophic failure and costly replacement of machinery as well as lengthy production interruptions Each machine fault generates a specific vibration pattern. The frequency of the vibration is determined by the machine
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The impact of rolling mill vibration extends beyond product quality to equipment health, making vibration control crucial. This study addresses the issue of …
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Soon after, Liu et al. set up a nonlinear vertical vibration physical model of the mill equipment, and the vertical vibration characteristics of rolling mill under nonlinear restraint force are ...
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A vertical vibration model of a 3-DOF strip rolling mill with a compound roll bearing failure on the outer raceway and inner raceway is established.
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To show the relation among different variables, the dynamic response of the important coal mill variables for a vertical roller medium speed mill during start-up, shutdown, steady state, and load change condition, is provided in Fig. 3.The real time per minute data is collected from Vadinar Power Corporation Limited (VPCL), a captive …
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Vibration issues of a five-stand tandem cold rolling mill were found in the steel production practice, and the experimental observation and numerical analysis indicated that the vibrations were related to the back-up roll bearing. The results were validated by replacing the back-up roll bearing with the new bearing resulting in 30% …
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DOI: 10.1016/J.JMATPROTEC.2004.04.422 Corpus ID: 135605351; Interdependence between the rolling speed and non-linear vibrations of the mill system @article{Bar2004InterdependenceBT, title={Interdependence between the rolling speed and non-linear vibrations of the mill system}, author={A. Bar and Andrzej Swiatoniowski}, …
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Vertical stirred mills have been widely used in the regrinding process in mining operations for its efficiency over other conventional mills. Screw liner wear prediction in these regrinding ...
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DOI: 10.1016/J.JMATPROTEC.2019.05.001 Corpus ID: 164986931; Dynamic analysis of vibration stability in tandem cold rolling mill @article{Xing2019DynamicAO, title={Dynamic analysis of vibration stability in tandem cold rolling mill}, author={Lu Xing and Jie Sun and Guangtao Li and Qinglong Wang and Dian-hua Zhang}, journal={Journal of Materials …
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mill vertical vibration model with a single point weak fault on the outer raceway was established. With the practical parameters of the
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Considering the influence caused by a early single pit defect on the outer raceway of the work roll bearing, a 2-DOF plate strip rolling mill vertical vibration model with a single point weak fault on the outer raceway was established.
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The cold rolling process is a high speed, transient, and time-related metal machining molding process [].As cold rolling mill is a multimass and rotary motion object system, the vibration as an implicit factor commonly exists in the course of its operation, but it usually does not apparently present due to the conditional constraints of factors …
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This paper studies the torsional vibration suppression control problem for the nonlinear rolling mill main drive system with performance constraint requirements and unknown measurement sensitivities. Firstly, considering the nonlinear friction between the roll gaps, a torsional vibration model of the main drive system of rolling mill is …
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Based on these dynamic rolling forces and the mechanical vibration of the rolling mill, a vertical–horizontal coupling nonlinear vibration dynamic model was established. The amplitude–frequency equation of the main resonance was derived by using the multiple-scale method. At last, the parameters of the 1780 rolling mill were used
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Therefore, in this paper, a 3-DOF vertical vibration model of strip mills with compound failure of the inner and outer raceways of work roll bearings is established.
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DOI: 10.1002/rnc.6098 Corpus ID: 247486498; Modeling and vertical torsional coupling vibration control of the rolling mill with full state constraints @article{Qian2022ModelingAV, title={Modeling and vertical torsional coupling vibration control of the rolling mill with full state constraints}, author={Cheng Qian and Jiajun Xu …
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3) Power supply phase fault. Symptom characteristics of power supply phase failure: Phase problems will cause a doubling of the power supply frequency; (2FL) is accompanied by (1/3) FL sidebands; The amplitude of electromagnetic vibrations at two power supply frequencies (2FL) may exceed 25 mm/s peaks if power supply faults are …
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The rolling mill system has the characteristic of measurement delay. In order to deal with the effects of time-delayed feedback from strip thickness measurement on vibration suppression, this paper studies the vibration suppression control strategy for rolling mill systems under time varying delay. Initially, the nonlinear rolling force and …
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The vertical roller mill used in the cement industry is a crucial piece of equipment that operates continuously and is essential for production. However, frequent breakdowns in its components, particularly the roller ends, have resulted in multiple production stops. To address this issue, the concept of analyzing the mill's sound …
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Aiming at fault vibration signals of rolling bearings with features of stronger non-stationarity and easy to be disturbed by strong background noise, a fault diagnosis method based on the short ...
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The productivity and capacity release of hot-strip rolling is severely limited by pendular vibration. Previous studies on mill vibration have investigated the influence of rolling parameters on vertical vibration; however, the influence of dynamic stiffness compensation factors on vertical vibration has not yet been considered owing to the …
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Learn about the most common causes of machine vibration, such as imbalance, misalignment, wear and looseness, and how they can affect equipment performance and reliability. Find out how to use the Fluke …
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actuator fault and sensor fault was studied in [19], and an adaptive fault-tolerant controller was put forward to suppress the aircraft wing vibration. [20] proposed ... the asymptotically stable of the rolling mill vertical vibration system with time delay and design the corre-sponding controller is of great significance. Inspired by the ...
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Vibration in hot tandem rolling mills has been a problem in the iron and steel industry mainly due to its unpredictability. In this work, vibration data of the second finishing mill (F2) stand of a hot tandem rolling mill are collected and analyzed, and a mathematical model based on the coupling of a non-uniform deformation process, mill …
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The aim is to reveal the mechanism of rolling mill vibration in continuous rolling process, the mechanism of rolling mill non-linear vibration instability and its changing law, and to explore the ...
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Considering the influence caused by a early single pit defect on the outer raceway of the work roll bearing, a 2-DOF plate strip rolling mill vertical vibration model with a single point weak ...
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