Research on Six DOF Vertical Vibration Model of a Four Roller Hot Strip Rolling Mill Stand

A lumped mass model with six degrees of freedom for the vertical vibration of four roller hot strip rolling mill stand was proposed, while its natural frequencies were calculated by MATLAB software. The numerical calculation results were proved more accurate through field vibration test. This vertical vibration model can be applied for dynamic simulation and structural dynamic modification with important theoretical and practical significance in mastering the vibration characteristics of four-roll mill, avoiding vertical self-excited vibration and improving production efficiency.

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Optimization of the Rollers System of Aluminum Strip Rolling Mill Based on the Stochastic Vibration

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.34-35.544 ◽

2010 ◽

Vol 34-35 ◽

pp. 544-550

Author(s):

Bao Yu Xu ◽

Yi Lun Liu ◽

Xu Dong Wang ◽

Fang Dong ◽

Zhi Cheng Kang

Keyword(s):

Mathematical Model ◽

Natural Frequency ◽

Dynamic Behavior ◽

Rolling Mill ◽

Vertical Vibration ◽

Damping Coefficient ◽

Hot Strip Rolling ◽

Strip Rolling ◽

Hot Strip ◽

Roller System

The dynamic behavior of roller system of a "1+4" hot strip rolling tandem mill were analyzed. The stochastic vertical vibration and the optimum mathematical model were established based on the reliability after the system simplified to some extent. Stochastic optimum has been done to the system according to the optimum mathematical model of the roller system. Its best natural frequency and damping coefficient are obtained by computer simulation under the situation of minimum response of the rollers stationary acceleration when chatter occurs. The results indicate that by optimizing the natural frequency and damping coefficient of the system can greatly improve the dynamic behavior of rollers system and equality of the strip, and are useful to the new design of the rolling mill and the setting up of the rolling parameters.

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The Research of 2 Degrees of Freedom Vertical Vibration System Modeling for 4-High Hot Strip Mill Stands

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.472-475.1759 ◽

2012 ◽

Vol 472-475 ◽

pp. 1759-1766

Author(s):

Wei Jin Ma ◽

Mi Rui Wang ◽

Feng Lan Li ◽

Jun Yuan Wang ◽

Shi Bo Xiong

Keyword(s):

Rolling Mill ◽

Degrees Of Freedom ◽

Research Result ◽

Rolling Process ◽

Vertical Vibration ◽

Hot Strip Mill ◽

Vibration System ◽

Lumped Mass ◽

Strip Rolling ◽

Hot Strip

A lumped mass model with two degrees of freedom for the vertical vibration system of four roller hot strip rolling mill stand is proposed, and then the parameters of dynamic model , include the equivalent mass , equivalent stiffness and its natural frequencies, were calculated by MATLAB package. The correctness of the model is verified via field vibration testing and signal analysis in the strip rolling process. Comparative the six degrees freedom model, the two degrees freedom model of our proposed is simplified reasonability and the model accuracy is maintained certainly . The two degrees freedom model is critical for the research of digital simulation of the strip rolling process. The research result have important theoretical and practical significance for the parameter optimization of the AGC system , vertical vibration control, the product quality improvement and the rolling speed increase for the rolling mill system.

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