The modal superposition method was used to solve the vertical vibration equations for the rolls of a six-high rolling mill; thus, the natural frequencies and modal shapes for the rolls were obtained for both free and forced vibrations.
The rolling mill with hydraulic system is widely used in the production of strip steel. For the problem of vertical vibration of the rolling mill, the effects of different equivalent damping coefficient, leakage coefficient, and proportional coefficient of the controller on the hydraulic screw down system of the rolling mill are studied, …
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 …
Based on the Orowan unit pressure differential equation, a vertical-horizontal dynamic rolling force model of workpiece was studied. Then, considering the influence of the rolling mill structure, the vertical-horizontal coupling vibration dynamic model of mill rollers was estabilished. The parse approximation solution of coupling system were …
This study establishes a vertical–horizontal coupling vibration model of hot rolling mill rolls under multi-piecewise nonlinear constraints considering the piecewise nonlinear spring...
The vertical vibration of the cold rolling mill has attracted the attention of several scholars. Tamiya [19] and Tlusty [20] found that post-tension variation can induce phase delay, which in turn leads to the vertical vibration instability of the cold rolling mill. Yun et al. [21] constructed the modal coupled flutter model and explored the ...
It is found that the natural frequency of the second order vertical vibration of the rolling mill is about 80 Hz. In its main vibration mode, six rollers vibrate inversely with the hydraulic cylinder block, as shown in Fig. 9. This is the ultimate cause of mill vibration, but it's hard to change because the mill structure has been determined.
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.
This article establishes a mechanical-electrical-hydraulic vertical torsional coupling vibration mathematical model, and investigates its vibration suppression control strategy with time varying full state constraints for the rolling mill vertical torsional coupling vibration system.
DOI: 10.1177/030947 Corpus ID: 269861416; Vertical vibration model for the roll system of a six-high rolling mill based on the Timoshenko beam theory @article{Gao2024VerticalVM, title={Vertical vibration model for the roll system of a six-high rolling mill based on the Timoshenko beam theory}, author={Shufeng Gao and …
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 …
In this paper, we find the violent vibration of the hot rolling mill is induced by the combination of the screw-down system and the strip, explain how the srew-down-strip combined excitation effects the rolling mill, and introduce an effective method to restrain the vibration. First, two experiments, stripless rolling and turning off the screw …
In this paper, a two degree of freedom nonlinear vertical vibration equation of the cold rolling mill with the dynamic rolling force was established, then the delay feedback control method was ...
The influence of nonlinear factors on the vibration of the rolling mill is studied by Niziol et al., they established the vertical vibration dynamic model with two degrees of freedom [10,11]. Bayón et al. considered that the nonlinear friction coefficient and nonlinear equivalent stiffness of hydraulic cylinder were caused by the change of ...
In this paper, taking a model of the vertical vibration of a four-roller cold rolling mill under harmonic excitation as a prototype class for a real system, the effects of …
After the improved foundation and other components were imported into the ABAQUS software, the shock vibration response of the ball mill foundation was calculated when the shock angle of the ball ...
1.. IntroductionThe vibrations of the subassemblies of the rolling stands and the strip in the frequency range (120–180 Hz) are among the phenomena causing the most critical profile defects of the metal sheet which is the final product of the rolling process.These defects are caused by the backward self- and parametrically excited …
Vertical vibration model of strip mill is established by considering piecewise nonlinear constraint arising from hydraulic cylinder. The approximate analytical solution of the model is obtained by incremental harmonic balance (IHB) method. The harmonic frequencies not conducive to stability are produced because the nonlinearity of the …
As the core control system of a rolling mill, the hydraulic automatic gauge control (HAGC) system is key to ensuring a rolling process with high speed, high precision and high reliability. However, a HAGC system is typically a mechanical-electric-hydraulic coupling system with nonlinear characteristics. The vertical vibration of the load easily …
Rolling mill vibration is a technical problem in the iron and steel industry for many years and has serious impact and harm on production. There were serious vibrations in the middle mills when rolling thin container strip for the compact strip production (CSP) strip hot rolling process. This paper studied the hysteretic characteristic of rolled strip …
The influence of nonlinear factors on the vibration of the rolling mill is studied by Niziol et al., they established the vertical vibration dynamic model with two degrees of freedom [10, 11]. Bayón et al. considered that the nonlinear friction coefficient and nonlinear equivalent stiffness of hydraulic cylinder were caused by the change of ...
A variable mass tuned particle absorber is designed for the nonlinear vertical vibration control of the corrugated rolling mill in the composite plate rolling process.
A variable mass tuned particle absorber is designed for the nonlinear vertical vibration control of the corrugated rolling mill in the composite plate rolling process.
In the process of strip rolling, mill vibration induces vertical and horizontal displacements in the rolls and rolled parts, affecting the accuracy of the rolling analysis model. Constant changes occurred in the rolling zone between the upper and lower working rolls due to mill vibration, resulting in slight vertical and horizontal displacements of the …
The shape and thickness qualities of strip are influenced by the vibration of rolling mill. At present, the researches on the vibration of rolling mill are mainly the vertical vibration and torsional vibration of single stand mill, the study on the vibration of tandem rolling mill is rare. For the vibration of tandem rolling mill, the key problem is the vibration of …
The dynamic behavior of the coupled vibration system can be controlled by varying the bifurcation parameter. This study provides a theoretical basis for restraining …
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. In ...
The vibration of the rolling mill affects the accuracy of products, which becomes one of the key factors. It can be divided into vertical vibration, 3, 14, 15 free transverse vibration, 16 ...
Download Citation | Delivering Way of Horizon Disturbance to Vertical Vibration in Temper Rolling Mill | Developed a mathematics model of temper rolling mill's dynamic rigidity change with the ...
The tandem cold mill chatter in sheet rolling has not always same phenomena even if under constant operating condition. For example, rolling speed and diverse frequency are not constant when chatter begins to occur. The reason why conditions of chatter are changeable is that the tension between mill-stands and the friction coefficient at the roll …
The vibration of the rolling mill has been a persistent issue affecting its safe and stable operation. To address the vibration problem in the F2 stand of a continuous rolling mill, this paper establishes a digital twin model of the rolling mill. Based on the digital twin model, a rolling mill virtual commissioning framework has been proposed to …
Furthermore, a new type of particle damping absorber was designed to suppress the vertical vibration of the mill. This study provided some theoretical guidance for the study of mill vibration damping [11]. However, a cold rolling mill is a nonlinear system with many random fluctuations. In the actual environment, random excitations …