the influence and cause of the vibration of the mill

《钢铁》2020年第4期 | 轧机液压压下系统非线性振动诱因分 …

Firstly, a vertical vibration model of the hydraulic screw-down system for the rolling mill is established considering the nonlinear spring force of the press cylinder. Secondly, the correlation between different system parameters and vertical vibration is analyzed by a vibration displacement-time diagram and a displacement-velocity phase diagram.

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2286. Nonlinear vibration characteristic of strip mill under the …

Furthermore, the severe vibration of rolling mill even cause broken belt and equipment damage accidents, resulting in serious economic losses [3-5]. For the vertical vibration problem of strip mill in the rolling process, experts and scholars have

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Amplitude-frequency characteristics analysis for vertical …

The influence of hydraulic AGC system is often ignored when the vertical vibration of rolling mill is analyzed. 18,19 18. H. Xu, L. L. Cui, and D. G. Shang, “ A study of nonlinear coupling dynamic characteristics of the cold rolling mill system under different rolling parameters ,” Advances in Mechanical Engineering 9 (7), 168781401771370 (2017).

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Prediction and analysis of cold rolling mill vibration based …

 · A mill vibration monitoring and data acquisition system is developed. • A technique to provide early warning of mill chatter based on prediction. • The SVR, NN-based, and XGBoost models are established for vibration prediction. • The results agree with the

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Processes | Free Full-Text | Research on the Vertical …

It is found that vertical vibration of the rolling mill has many inducements, but it is more related to the hydraulic system [3,4], because the hydraulic screw down system is the power source in the vertical direction of the mill [].Figure 1 shows that the rolling force is generated by applying the screw down cylinder to the roll system. . Moreover, the hydraulic system itself is composed of ...

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Coupled Vibration Behavior of Hot Rolling Mill Rolls under …

A coupled vibration model of hot rolling mill rolls under multiple nonlinear effects is established by considering the nonlinear spring force produced by the hydraulic cylinder, the nonlinear friction between the work rolls, the dynamic variation of rolling force, and the effect of external excitation as well as according to the structural constraints of a four-high hot rolling mill in the ...

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1,2 1,3, 4,

Processes 2019, 7, 792 2 of 13 It is found that vertical vibration of the rolling mill has many inducements, but it is more related to the hydraulic system [3,4], because the hydraulic screw down system is the power source in the vertical direction of the mill [5].

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Interdependence between the rolling speed and non-linear …

 · Fig. 3 shows the influence of the rolling stand stiffness on its vibration intensity. Two rolling stands were compared for which the second natural frequencies are 140 and 199 Hz, respectively. In the first case, third mode of strip vibration occurs, and in the second case, fourth mode is observed.

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811. Frequency analysis of chatter vibrations in tandem rolling …

variation. It may also cause severe damage to the rolling mill and strip rupture under extreme conditions [1]. Chatter is characterized by a very sudden occurrence [2] and was called “ghost vibration” by the operators of the milling plants [3]. It has also been found

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(PDF) Transient Torsional Vibrations Control in the Geared …

However, the torsional vibration which usually occurs in main drive system has been recognized as a major restriction to the increase of strip yield and improvement of product quality [1,2]. It ...

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Frequency modulation of high-speed mill chatter

 · Mill vibration may cause chatter marks that degrade the surface quality of a rolled strip and quicken the abrasion of machine parts when serious. Consequently, the rolling speed has to be slowed down, which will sace the design capacity of high-speed rolling mills.

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Stability Analysis of a Nonlinear Coupled Vibration Model …

Liu et al. [] established a dynamic vibration considering the torsional vibration of gear and the horizontal vibration of the roll, and the stability of the mill drive system was analyzed. Peng et al. [ 25 ] proposed a swing chatter model coupling the vertical-horizontal-torsional vibration and studied the influence of meshing impact force on the roll system stability.

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The cause and treatment of vibration failure of verticalmill

Vibration is the most important factor affecting vertical mill operation.The vibration of vertical mill is detected by vibration sensor of reducer (transverse and longitudinal mounted on reducer).Its measurements are converted into electrical signals that are fed to a computer.But if the adjustment is not good, once the amplitude exceeds the rating, it will automatically alarm until stop grinding.

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Dynamic modeling and numerical analysis of a cold rolling …

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 ...

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How to reduce vibration in milling

Milling vibration can arise due to limitations in the cutting tool, the holding tool, the machine, the workpiece or the fixture. To reduce vibration, there are some strategies to consider. The cutting tool For face milling, the direction of the cutting forces must be considered:

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THE INFLUENCE OF VIBRATION ON THE MILL PERFORMANCE …

2.The influence of the vibration into the mill work system. In the thermo central of Kosovo B mills which serves for gridding coal can operate according to the production rules only 6.000 hours. After finishing of 6.000 hours the mill has to be submitted for the capital

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How bearings may be affected by vibration?

Wear caused by vibration Appearance: Depressions in the raceways. These depressions are rectangular in roller bearings and circular in ball bearings. The bottom of these depressions may be bright or dull and oxidized. - Cause: The bearing has been exposed

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Unstable vibration of roller mills

 · As previously mentioned, the grain size of materials has a great influence on the mill vibration and mill vibration occurs with fine material. From these facts, the cause of the mill vibration is considered to be the friction characteristics of materials, that is, the friction coefficient decreases according to the increase of the table speed, and the mill vibration is due to the stick–slip ...

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Dynamic Model of the Hot Strip Rolling Mill Vibration …

The vibration demolding of the crystallizer leads to slab thickness deviation in continuous casting processes. Therefore, in this paper, the dynamic model of the hot strip rolling mill vibration resulting from entry thickness deviation is proposed and its dynamic characteristics are studied. First, the dynamic model of vertical vibration in the hot strip rolling mill is established based on ...

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A unified process damping model considering the varying …

The horizontal vibration mechanism of hot tandem rolling mill was studied, and the relationship between the horizontal vibration and the rolling process parameters was obtained.

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Experimental and Numerical Investigation of the Vibration Characteristics in a Cold Rolling Mill …

bearings may cause the amplitude and frequency modula-tion in the vibration of the mill. Self-excited and nonlinear parametric vibration in the cold rolling processes was ana-lyzed by Bar and Swiatoniowski.6) Chatter vibration of a cold rolling mill was analyzed

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Rolling process and its influence analysis on hot …

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.

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Forced transverse vibration of rolls for four-high rolling …

In order to study the transverse vibration of rolls for four-high mill and its effect on the strip shape, the free transverse vibration model of rolls for four-high mill was built.

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Investigation into the electromechanical coupling …

 · 1. Introduction The vibration caused by a rolling mill not only affects the smooth and steady character of the running mill, but also affects the quality of the rolled strip, especially the superficial quality. When the rolling mill is running, it shows violent vibration and the ...

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Simulation on Hydraulic-Mechanical Coupling Vibration of …

 · The root cause of vibration is most likely roll gap related. This paper focuses on work on the 72 in. tandem mill. It is demonstrated that vibration performance can be improved by the use of a ...

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A Nonlinear Research on Coupled Vibration of Strip Steel with the Impact of the Main Drive System of Tandem Mill

torsional vibration of rolling mill transmission system [5]. Our group studied the influences of multi-clearance and slipping on the torsional vibration of the main drive system of rolling mill [6, 7]. In terms of strip steel vibrations, Swiatoniowski and Bar

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THE INVESTIGATION OF END MILL FEEDS ON CNC ROUTER MACHINE USING VIBRATION …

Abstract --Vibration on End Mill Feeds will occur due to friction between the workpiece and end mill. The friction which occurs will cause tool wear in the insert blade. At this point, the tool wear experienced by the end mill can be seen from the imperfect feed of

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Rolling process and its influence analysis on hot …

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 show that the rolling force is increased ...

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Vibration

Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point.The word comes from Latin vibrationem ("shaking, brandishing"). The oscillations may be periodic, such as the motion of a pendulum—or random, such as the movement of a tire on a gravel road. ...

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