2009-5-21 · 37.Zeng L, Zang Y*, Gao Z, et al, Stability analysis of the rolling mill multiple-modal-coupling vibration under nonlinear friction. Journal of Vibroengineering, 2015, 17(6):2824-2836. 38.Zeng Q, Zang Y*, Qin Q, The effect of roll with passive segment on the planetary
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Wu S, Wang L, Shao Y, et al. Vibration characteristic analysis of twenty-high rolling mill with local defect on roll surface based on the time-varying contact stiffness. Eng Failure Anal 2014; 42 ...
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2019-10-24 · Rolling mill runout usually occurs during high-speed rolling of extremely thin strip. Because of the beating, the thickness of the strip fluctuates, it is easy to break the strip. Therefore, once the rolling mill has obvious beating sound, the rolling speed shall be reduced immediately to eliminate the vibration.
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2019-3-8 · rolling process, which is the basis for further analysis of coupled vibration characteristics of rolling mills. 3. The Static Bifurcation Characteristics of Coupled Vibration System of Strip Mill . Solving formula (2) by using multiscale method, the amplitude-frequency response equation of nonlinear coupled vibration of strip mill can be ...
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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 using a numerical model.
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2016-9-9 · 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 perform these operations, rolling mills are used. ...
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The torsional vibration model of main drive system for 6-high cold rolling mill was established. Calculation formula of torque amplification factor (TAF) of main drive system was put forward when the clearance exists or not. The TAF-curve, changing by the biting time of blank, was drawn, and whether torsional vibration could cause mechanical failure in weak link of main drive system was judged.
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A numerical model of the rolling mill including the driv-ing system was built as rigid bodies to perform the multi-body dynamic analysis. The static rolling force of the mill was measured and the dynamic rolling force was computed according to the analytical model. Because the 6-high cold rolling mill is structurally symmetrical, only the upper ...
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Steel mill process engineering including rolling mill process simulations. Equipment design and supply of rolling mill machinery including millstands, shears, cooling beds and auxiliary mill equipment. Pass design services, physical pass design simulation, operations consulting and specialized rolling courses.
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2019-7-30 · rolling mill vibration, because the problem is too compli- cated,ithasnotbeensolvedwell.A.BarandO.Barpresented the numerical analysis of vibrations with moderate frequen-
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In order to know the character of twist vibration for vertical rolling mill processing,the model of twist vibration was established.The model parameter computation and the simulation of rolling process were carried out by MATLAB.The bifurcation diagram,the phase ...
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2019-5-9 · [3] Xing Lu, Jie Sun*, Guangtao Li, Qinglong Wang, Dianhua Zhang, Dynamic analysis of vibration stability in tandem cold rolling mill, Journal of Materials Processing Technology, 2019, 272, 47-57, 通讯作者, 4.178
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The effect of mill modulus control gain on hot rolling mill vibration is positive compensation, negative compensation and no compensation, respectively. Based on the above analysis, a practical measure to relieve mill vibration can be proposed. The vibration frequency for the hot rolling mill …
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In this work, the Hopf bifurcation of the main drive delay system of rolling mill is controlled and analyzed by designing a nonlinear controller. The time-delay is selected as a bifurcation parameter, and the following conclusions are obtained through analysis: (1) in the absence of state feedback control, the system will generate the Hopf bifurcation at the expense of its stability when the ...
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2019-10-30 · BALL MILL DRIVES, LOADED, OVERALL VIBRATION, SEPTEMBER 1A 1B • Above is a plot of the overall vibration levels at both the 1A & 1B ball mills when loaded. • Note how levels at 1A ball mill are higher than that at 1B ball mill for nearly every measurement.
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2020-10-7 · T. Hopf bifurcation and stability analysis on the mill drive system. Applied Mechanics and Materials, 2011, 121-126: 1514-1520. [8]Zeng L Q, Zang Y, Gao Z Y. Multiple-modal-coupling modeling and stability analysis of cold rolling mill vibration[J]. Shock ...
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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, the acquired vibration signals can be analyzed within defined frequency ranges.
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2020-10-13 · 3-1992, "Asymmetrical Rolling and Hot Roughing Mill Vibrations", ASME Journal of vibration and Acoustic (to be submitted) 4-1993, "Vibration Analysis of a Hot roughing Mill during Asymmetrical Rolling", 2nd Asian-Pacific Conference on Computational Mechanics, Sydney.
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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 ...
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2020-10-31 · In recent trends the industries are transforming from preventive maintenance to predictive maintenance. It essentially involves human sensory with mixture of sophisticated instruments to inspect the machines while running. Vibration analysis is the one of the most effective tool used to check the health of plant machinery and diagnose the causes.
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2019-10-1 · Mehrabi et al. (2015) also investigated the effects of some rolling conditions on chatter stability in cold rolling using FEM analysis. Kim et al. (2012) analyzed the cause and characteristics of the chatter vibration in a six-high cold rolling mill by using multibody dynamics. However, it is difficult to incorporate coupling effects and ...
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2018-12-14 · Keywords: Chatter, Principal Component Analysis (PCA), cold rolling, vibration 1. INTRODUCTION In cold roll mill alternate dark & bright bands are often observed on rolled strip surface along the length of the coil perpendicular to rolling direction. These bands on strip surface are called chatter mark defect shown in Fig. 1.
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2019-5-19 · Rolling mill vibration has become a bottleneck for manufacturing thin steel strips and a worldwide problem, 1,2 as it can cause unacceptable thickness variations and severely damage the mill equipment. 3,4 Therefore, damping mill vibration is very important for the rolling industry. Rolling mill vibration is a coupling vibration among ...
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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 ...
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Vibration Analysis of Chatter in Cold Rolling Mill Theoretical Study on Self-Excited Vibration by a Two-DOF Tandem Model Kazushige ISHINO 1), Kazuhisa KABEYA 1), Takao YOSHIKAWA 2) 1) Mechanical Engineering Department, JFE R & D Corporation 2) [in Japanese] Released 2011/03/04 ...
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IVC Technologies is dedicated to helping our customers achieve optimal efficiencies through Condition Based Monitoring (CBM) utilizing our highly experienced and certified CBM Analysts, cutting-edge technology, and equipment with unsurpassed analytic capabilities. Our Advanced Testing Group (ATG) is comprised of the foremost leading experts in the diagnosis of the most complex problems ...
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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 ...
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2020-11-8 · Problematic mill vibration. Natural resonances of the rolling mill involve translational motion of the rolls. This typically occurs at frequencies greater than 50Hz. Of the large number of these resonant modes that could become excited during rolling, only a few will cause damage to the metal in the mill or the surfaces of the rolls.
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Compensation of a Digitally Controlled Static Power Converter for a Damping of Rolling Mill Torsional Vibration,” ... “Analysis of Factors Influencing Rolling Pressure and Power Consumption in the Hot Rolling of Steel,” Steel 93. 12. Ginzburg, V. B., 1989, Steel—Rolling Technology—Theory and Practice, Marcel Dekker, New York.
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