Research on vibration characteristics of mill rolls based on …
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 ...
Vertical nonlinear vibration analysis of cold rolling …
Vertical nonlinear vibration characteristics of the cold rolling mill are studied. •. Using the Magnus series to solve the vibration response and dynamical …
Vertical Vibration of Strip Mill with the Piecewise …
Vertical vibration of the strip mill is one of the main problems in rolling production. Reduction in productivity due to vibration is serious effect on the quality of rolled strips, especially in the running process of the strip mill under high speed and strong load. A small fluctuation can lead to the system deviate from the equilibrium state ...
Rolling process and its influence analysis on hot continuous …
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 …
Vibration Analysis of a Vertical Roller Mill: Modeling and Validation
Abstract. In this paper, vibration characteristics of a Vertical Roller Mill (VRM) are studied by using physical parameters of an operating VRM. The mathematical model is derived and simulated for ...
Research on vertical vibration of hot rolling mill …
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...
Application of dynamic vibration absorber for …
Kimura et al. installed a dynamic vibration absorber (DVA) on the cold rolling mill to offset the vibration energy by detecting the vibration signal of the roller …
Vertical Vibration Model for Unsteady Lubrication in Rolls …
The vertical vibration of a cold rolling mill as a dynamic process can mainly be expressed by the amount of change of displacement of the work rolls and strip during the rolling process. If the change is too large, it means that the vertical vibration has affected the rolling thickness at exit and surface quality. Therefore, discussing the ...
Vertical–horizontal coupling nonlinear vibration …
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 for ...
Vertical hammer mill | Lamec
The vertical mill is a very compact machine designed to take up less space and offer the user a high level of production capacity with reduced energy consumption. ... High safety standards: bearing temperature is monitored by PT 100 sensors and a vibration detection system may be installed (optional).
Vertical Vibration Control of Cold Rolling Mill's Rolls …
Abstract. 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 introduced into the equation to controlled the vertical vibration of the system. The amplitude-frequency equations of primary resonance of ...
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 …
[PDF] Vertical Vibration Control of Cold Rolling Mill's Rolls …
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 introduced into the equation to controlled the vertical vibration of the system. The amplitude-frequency equations of primary resonance of system was carried out by …
Vertical vibration of strip mill with the piecewise nonlinear
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 ...
Application of dynamic vibration absorber for vertical vibration
Abstract. 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. Considering the ...
Analysis on parametrically excited nonlinear vertical vibration …
A vertical nonlinear parametrically excited vibration model of 4-h rolling system was established,in consideration of the nonlinear damping and nonlinear stiffness between working rolls.The analytic approximate solution of parametric resonances to corresponding main frequency,ultra harmonics and inferior harmonics were studied by using multiple …
Vertical nonlinear vibration analysis of cold rolling mill …
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.
Vertical nonlinear vibration analysis of cold rolling mill …
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 ...
Study on Work Roll Vertical Vibration Under Periodic …
Abstract The dynamic effect of work-roll oxide-film periodic spalling on vertical vibration in a hot strip rolling mill was studied. Based on dynamic monitoring test analysis, the friction of the work-roll surface under oxide-film periodic spalling is discussed. Using an average rolling pressure formula, the rolling force under the dynamic vertical …
Bifurcation Characteristic Research on the Load …
Liu et al. researched the vertical, nonlinear parametric vibration characteristics of the mill roll system, and discussed the influence of parameters such as damping, stiffness and external excitation on …
(PDF) Vertical Vibration Characteristics of Strip Rolling Mill …
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.
Processes | Free Full-Text | Research on the …
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 …
Modeling and vertical torsional coupling vibration control …
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.
Vibration Analysis of a Vertical Roller Mill: Modeling …
Request PDF | Vibration Analysis of a Vertical Roller Mill: Modeling and Validation | In this paper, vibration characteristics of a Vertical Roller Mill (VRM) are …
Dynamics and stability analysis of rolling mill system
They simulated the system to investigate how the stiffness and damping characteristics of the rolling interface affect the vertical vibration of the rolling mill. Liu et al. [15, 16] developed a 2-degree-of-freedom vertical dynamic model of the rolling mill that considered the constraining effect of the nonlinear stiffness of the hydraulic ...
Bifurcation characteristics of torsional-horizontal coupled vibration …
At the same time, some scholars have studied the dynamic behavior of rolling mill from the perspective of vertical and horizontal vibration. Yang X. [13] presented a vertical vibration model based on lubrication and friction theory. Hou D. [14, 15] established a vertical-horizontal coupling vibration dynamic model of rolling mill.
(PDF) Vertical Vibration Control of Cold Rolling …
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 ...
Research on strip hysteretic behavior and mill vertical vibration
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 and …
Vertical Vibration Model for Unsteady Lubrication in Rolls …
According to the vertical vibration phenomena existing in cold rolling mills, the unsteady lubrication mechanism in roll gap and its influence to rolling stability was chosen as the case for analysis.
Research on vibration characteristics of mill rolls based on …
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 ...