Vertical–Horizontal Coupling Vibration of Hot Rolling …
main drive system of a rolling mill to an electromechanical coupling vibration [11,12]. ... Coupling dynamics diagram of a rolling mill structure and rolling process. Metals 2021, …
Nonlinear vibration characteristic of strip mill under the coupling …
the mill roll stand structure model and the h ydraulic servo sys tem model; meanwhile the effects of different working conditions on the stability of cold rollin g mill system were d iscussed; It
Nonlinear Dynamics of Torsional Vibration for …
The simulation calculation and dynamical analysis were carried out by taking 1 780 rolling mill of Chengde Steel Co as an example, and a number of disciplinar ian …
Couplings in roll forming mills
Roll forming mills further process flat steel sheets into profiled sheets. For this purpose, the sheets are guided over rollers driven by geared motors. Robust couplings from R+W provide the connection between the drive and the roller. Roll forming creates profiles from strips or sheets. Many industries make use of these profiled sheets, for ...
Bifurcation and chaos for electromechanical coupling torsional
Bifurcation and chaos for electromechanical coupling torsional vibration in rolling mill system driven by DC motor is studied in this paper. Considering the electromechanical devices under ...
Roll System and Stock's Multi-parameter Coupling
ZHANG Y F, YAN X Q, LIN Q H. Characteristic of torsional vibration of mill main drive excited by electromechanical coupling[J]. Chinese Journal of Mechanical …
Nonlinear Dynamics of Torsional Vibration for Rolling Mill's Main Drive
The jointed shaft in the drivelines of the rolling mill, with its angle continuously varying in the production, has obvious impact on the stability of the main drive system. Considering the effect caused by the joint angle and friction force of roller gap, the nonlinear vibration model of the main drive system which contains parametric excitation stiffness …
Adaptive Torsional Vibration Control of the Nonlinear Rolling Mill …
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 …
Dynamic analysis and control of strip mill vibration under the coupling …
If the vibration divergence behavior of the mill the roll system is controlled, the limit cycle amplitude of the mill the roll system converges to a small range, which enhances the stability of the system to a certain extent. ... Lin Q. Characteristic of torsional vibration of mill main drive excited by electromechanical coupling. Chinese ...
Nonlinear Dynamics of Torsional Vibration for Rolling Mill's Main Drive
Available online at %# # # ScienceDirect JOURNAL OF IRON AND STEEL RESEARCH, INTERNATIONAL. 2013, 20(1) â– . 07-12 Nonlinear Dynamics of Torsional Vibration for Rolling Mill's Main Drive System Under Parametric Excitation SHI Pei-ming 1, LI Ji-zhao 1, JIANG Jin-shui 1, LIU Bin 1, HAN …
Statically determinate characteristics of microdisplacement …
Introduction. Four-high mills are mainly used for rolling foils, sheets and plates and account for a large percentage of all mills. The speed of contemporary four-high mills has reached 1800–2200. m/min to meet demands for rolling of foils and sheets.. However, frequent burning of end-thrust bearings in the work-roll assembly can disrupt …
Coupling dynamic model of chatter for cold rolling | Journal …
In order to build high accuracy integral dynamic models of cold rolling mill system, by analyzing the vibration process of cold rolling, the dynamic model of 4-h mill, including the rolling process model, the mill roll stand structure model and the hydraulic servo system model is built. These three models are coupled and linearized, then the …
Nonlinear vibration characteristic of strip mill under the coupling …
Yang et al. proposed a coupling vibration model by coupling the rolling process model, the mill roll stand structure model and the hydraulic servo system model; meanwhile the effects of different working conditions on the stability of cold rolling mill system were discussed; It contributes to the further study and suppression of coupling ...
Vertical–horizontal coupling nonlinear vibration …
Considering the dynamic influence of the roll vibration on the lubricant film thickness in the rolling deformation area, nonlinear dynamic rolling forces related to film thickness in the vertical and horizontal directions were obtained based on the Karman's balance theory. Based on these dynamic rolling forces and the mechanical vibration of …
Nonlinear Dynamics of Torsional Vibration for Rolling Mill's Main Drive
It mainly brings about the vibration of rolling mill [13–15]. The reports are mainly to determine the vibration mode of the main drive system and analyze the impact of the main drive system on the roll system vibration, and parts of studies focus on multi-system coupling characteristics [16–18].
Impact of electromechanical coupling of main drive system …
Impact of electromechanical coupling of main drive system of cold rolling mill on amplitude-frequency characteristics. ... Main drive mechanical system of a cold rolling mill was simplified to a three-inertia model, and natural frequency of mechanical system was obtained by using Matlab simulation. ... journal citation and DOI. Show References ...
Dynamics of rolling mill drive system considering arc …
The drive system of a hot rolling mill is the power source to roll strip, which is mainly composed of a gearbox, a main spindle, a herringbone gear box, spindles and a roll system. The spindle connecting the herringbone gear box and the roll system adopts an arc tooth gear structure, which has a strong transmission capacity in the coupling.
An improved method for calculating roll deformation of six …
The roll deformation model of the six-high rolling mill is one of the core models of the strip shape control theory. The influence function method (IFM) is a numerical method applied to solve the roll deformation problem. This study aims to address the problems of slow calculation speed and insufficient calculation accuracy of IFM in …
Study on Vibration Asymmetry of Hot Rolling Mill with
2.1 Establishment of Vibration Model. Considering the actual structural asymmetry of the hot rolling mill, as well as the vertical and horizontal directions in the rolling process by the strip entrance thickness and roll thickness fluctuations resulting in changes in rolling forces, the horizontal–vertical coupling vibration model of the mill …
Design and Analysis of Yoke of Mill Rope Coupling
The detrimental side effects of using conventional tailbar-and-collar couplings to drive sugar mill top rolls arefamiliar to all sugar-mill engineers. Tailbars generate thrust as well as radial loads that apply bending moments to the driving and, driven shafts. Replacing the tail bar coupling (Fig. 1) with a Mill Rope Coupling (Fig. 2) is ...
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Main drive mechanical system of F5 cold rolling mill in steel plant consists of main motor, gear box, cross universal joint shaft, and roll as shown in Figure 1. Main motor driven gear box by the ...
Analysis of coupling mechanism between roll system …
In order to ensure the accuracy of the model simulation results, the boundary conditions are constrained as much as possible according to the actual situation, and the actual working conditions are reasonably simplified as shown in Fig. 2.The fixed constraint simulation is applied to the screw part to provide the rolling mill stiffness; the arc surface …
Adaptive Torsional Vibration Control of the …
This paper studies the torsional vibration suppression control problem for the nonlinear rolling mill main drive system with performance constraint requirements and …
Abnormalities and Failures of Rolling Mill Rolls – IspatGuru
Overloads can be experienced through a variety of conditions such as (i) a mill stall due to a sticker, (ii) rolling abnormalities such as welding of material being rolled, wrong pre-set of the roll gap etc., and (iii) incorrect drive shaft fitting, either by the rolling mill, or by incorrect machining of the drive end. This is generally a mill ...
Review on Main Drive Torsional Vibration and Roller Coupling …
A dynamic model coupling vertical and horizontal vibrations is also established to analyze the vibration characteristics of a Sendzimir twenty-high cold roll mill based on the rolling force ...
Hopf bifurcation control of nonlinear electromechanical coupling …
The nonlinear dynamic model of electromechanical coupling main drive system of rolling mill with nonlinear stiffness and frictional torque is established. The equilibrium point of the system is analyzed, the conditions of the Hopf bifurcation of the system are given, and the type of the bifurcation is studied. The Hopf bifurcation controller is obtained by using the …
Modeling and vertical torsional coupling vibration control of …
The International Journal of Robust and Nonlinear Control promotes development of analysis and design techniques for uncertain linear and nonlinear systems. ... and investigates its vibration suppression control strategy with time varying full state constraints for the rolling mill vertical torsional coupling vibration system. Firstly, the ...
Investigation into the electromechanical coupling unstability …
The parameter vibration model of a rolling mill. The flexural-vibration of strip is caused by tension of the coiling and uncoiling and vertical force caused by vertical movement of the roll, its mechanical model being shown in Fig. 1. Supposing that the tension is T, the dynamics equation is ∂ 4 w ∂x 4 +2 ∂ 4 w ∂x 2 ∂y 2 + ∂ 4 w ∂ ...
Tandem strip mill's multi-parameter coupling …
The rolling process is determined by the interaction of a number of different movements, during which the relative movement occurs between the vibrating roll …
Vibration Energy Coupling Behavior of Rolling Mills under …
The operation of the world's first multimode continuous casting and rolling F3 (3rd finishing mill stand) finishing mill was hampered by frequent vibrations. Mill vibrations were found to be caused by the transmission and coupling of vibration energy flow. In this study, an overall finite element model of the F3 stand is established based on the …
(PDF) Failure Analysis of Rollers in mill stand using Failure …
This is either a mill or roll fault. Journal Failure from Drive End Torque: The torque on the drive end has exceeded the torsional strength of the journal material. The strength of the journal will also be affected by the notch effect of sharp radii, i.e. in the split ring recess, or any other stress raisers such as radial bore-holes.