Numerical Investigation of Chatter in Cold Rolling Mills

Dwivedy, Santosha K.; Dhutekar, S. S.; Eberhard, Peter

doi:10.1007/978-3-642-22700-4_12

Cited by 8 publications

(5 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Usually depending on different research purposes and the accuracies, it is simplified to the multidegrees-of-freedom vibration system of "mass-damping-spring" using the mechanical model method. This paper as shown in Figure 3 takes a single stand with four rolls cold mill as a study object and assumes that physical contact between the work roll and support roll is considered as a spring [17] besides, two rolls always remain in contact status during the rolling process. Since mill is basically symmetric along the rolling line, the four-roll mill can be simplified as single degree of freedom vibration system, as shown in Figure 4.…”

Section: Vertical Vibration Model On Unsteady Lubrication Condition Imentioning

confidence: 99%

“…By simulation experiment, it is found that the normal rolling pressure stress in deformation area calculated based on this model exists a jump occurrence phenomena at the neutral plane, which is shown in Figure 6. According to the existing research results [15][16][17], it is known that the friction lubrication state variation in the deformation zone, especially the negative damping effect in the deformation zone, would have direct impact on vertical system stability and may result in the mill system self-oscillation. Thus, the stress hopping phenomenon shown in the figure is also one of the reasons why self-excited vibration phenomena happen to the cold rolling mill in the high-speed rolling sheet.…”

Section: Simulation Analysis On Rolling Force and Normal Rollingmentioning

confidence: 99%

See 1 more Smart Citation

Vertical Vibration Model for Unsteady Lubrication in Rolls-Strip Interface of Cold Rolling Mills

Yang

Tong

2012

Advances in Mechanical Engineering

View full text Add to dashboard Cite

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. On the basis of rolling theory, lubrication and friction theory, and mechanic vibration theory, the vertical vibration model for unsteady lubrication in rolls-strip interface was presented. The Geometry model of roll gap, the unsteady lubrication model of roller-strip working interface, the distribution model of normal rolling stress and friction stress, and the rolling vertical structure model were taken into account. Based on the rolling equipment and process parameters of aluminium mill, the rolling force curve and dynamic response of working roll displacement variation was simulated on Matlab/Simulink platform. A comparison with actual production data shows the validity of this vibration model.

show abstract

Section: Vertical Vibration Model On Unsteady Lubrication Condition Imentioning

confidence: 99%

Section: Simulation Analysis On Rolling Force and Normal Rollingmentioning

confidence: 99%

Vertical Vibration Model for Unsteady Lubrication in Rolls-Strip Interface of Cold Rolling Mills

Yang

Tong

2012

Advances in Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…In Ref. [15], a dynamic fric tion model has been used to develop the expressions for the varia tion of pressure and shear stress in the roll bite for a four high cold rolling mill. It may be noted that in all these literatures, the analysis of rolling mills has been carried out without taking in consideration all the effects simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamic Analysis of a Parametrically Excited Cold Rolling Mill

Kapil

Eberhard

Dwivedy

2014

Journal of Manufacturing Science and Engineering

View full text Add to dashboard Cite

In this work, a four high cold rolling mill is modeled as a spring-mass-damper system considering horizontally and vertically applied time-dependent forces due to the interac tion between the strip and the working rolls. The effect of vibration of the moving strip on the work roll vibration is also considered for developing the governing equation of motion o f the system which is found to be that of a nonlinear parametrically excited sys tem. The governing equation of motion is solved by using the method of multiple scales to find the instability regions and frequency-response curves of the system. The critical am plitude of horizontal load in roll bite is calculated and the frequency-response is studied in detail considering the effect of various process parameters, such as velocity, thickness of strip, time delay, amplitude, arid frequency of horizontal load in roll bite. This work can find application in the design and development of high speed and chatter free rolling mills.

show abstract

“…Compared to coulomb friction model and the friction factor model, the rolling stress at roll bite obtained with the dynamic friction model is more consistent with the test results, for the "pinnacle" at the neutral point disappeared. Xu [8,9] and Dwivedy [10] used this model to study the chatter mechanism in rolling. Their research results show that there exists a jump of the rolling force stress at the neutral point and it is responsible for the onset of chatter in rolling.…”

Section: Introductionmentioning

confidence: 99%

Rolling mill chatter mechanism based on the unsteady lubrication performance

Liu¹,

Zang²,

Gao³

et al. 2017

J. vibroeng.

View full text Add to dashboard Cite

The unsteady lubrication is one of the major causes for self-excited vibration in rolling. But it is difficult to build a rolling chatter model which considers the unsteady lubrication state in roll bite. Using the regression exponential function model of rolling friction coefficient, a dynamic rolling process model was built. Coupling the dynamic rolling process model with a mill stand structure model, a chatter model which considers the unsteady lubrication state at roll bite was established. Based on the proposed chatter model, the friction coefficient, rolling force and critical velocity of a rolling mill stand under different working conditions were calculated. The computed results were compared to the test results. And it proves the validity of the proposed model. With the proposed chatter model, the effects of rolling process parameters and emulsion lubricant characteristic parameters on friction coefficient and critical velocity were both analyzed and discussed. The chatter model successfully introduces the unsteady friction model into the rolling mill chatter model. It better explains the negative damping effect of the rolling chatter and reflects the rolling mill dynamic vibration characteristic.

show abstract

Numerical Investigation of Chatter in Cold Rolling Mills

Cited by 8 publications

References 15 publications

Vertical Vibration Model for Unsteady Lubrication in Rolls-Strip Interface of Cold Rolling Mills

Vertical Vibration Model for Unsteady Lubrication in Rolls-Strip Interface of Cold Rolling Mills

Nonlinear Dynamic Analysis of a Parametrically Excited Cold Rolling Mill

Rolling mill chatter mechanism based on the unsteady lubrication performance

Contact Info

Product

Resources

About