Torsional Vibration Analysis of Drive System for 6-High Cold Rolling Mill

2013 ◽  
Vol 721 ◽  
pp. 572-578
Author(s):  
Yu Hou ◽  
Zhi Jing Zhang ◽  
Yan Xia Guo ◽  
Jiu Qiang Feng ◽  
Jie Luo
Keyword(s):  
Cold Rolling ◽  
Torsional Vibration ◽  
Rolling Mill ◽  
Weak Link ◽  
Drive System ◽  
Cold Rolling Mill ◽  
Vibration Model ◽  
The Impact ◽  
Main Drive System ◽  
Biting Time

The torsional vibration model of main drive system for 6-high cold rolling mill was established. Calculation formula of torque amplification factor (TAF) of main drive system was put forward when the clearance exists or not. The TAF-curve, changing by the biting time of blank, was drawn, and whether torsional vibration could cause mechanical failure in weak link of main drive system was judged. The TAF variation with the biting time of blank was analyzed when the clearance exists. The method to reduce TAF was proposed before the clearance was eliminated, and the effect caused by the impact on main drive system was alleviated.

Research on Main Drive System Vibration of Six-Roller Wide Strip Aluminum Cold Rolling Mill

2014 ◽  
Vol 644-650 ◽  
pp. 259-264
Author(s):  
Da Zhi Zhang ◽  
Ling Qi Meng
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Electromechanical Coupling ◽  
Harmonic Component ◽  
Oscillation Period ◽  
Drive System ◽  
Response Analysis ◽  
Cold Rolling Mill ◽  
Finite Element Software ◽  
Main Drive System

Vibration appears in the main drive system of the six-roller cold rolling mill of one plant. The oscillation frequency is 2.5 Hz. The oscillation cycle is 0.4 second. The oscillation period has nothing to do with the speed. Using the finite element software ANSYS, the low natural frequency is got through the modal analysis and harmonic response analysis based on the measured vibration data from the field. Horizontal vibration is the main vibration mode and it is the electromechanical coupling vibration. Main motor is controlled by IEGT inverter of TEMIC and the low frequency harmonic component is difficult to eliminate. AC drive trap filter is designed to dodge the 2.5 Hz frequency. The solution has achieved the recognition by the TEMIC company. The problem was solved and good results were obtained.

scholarly journals A study of nonlinear coupling dynamic characteristics of the cold rolling mill system under different rolling parameters

2017 ◽  
Vol 9 (7) ◽  
pp. 168781401771370 ◽  
Author(s):  
Hai Xu ◽  
Ling-Li Cui ◽  
De-Guang Shang
Keyword(s):  
Fault Diagnosis ◽  
Cold Rolling ◽  
Dynamic Characteristics ◽  
Rolling Mill ◽  
Vibration Amplitude ◽  
Strip Thickness ◽  
Drive System ◽  
Nonlinear Coupling ◽  
Cold Rolling Mill ◽  
Coupling Dynamic

The dynamic characteristics of the mill and the drive system are mutually coupled and affected closed-loop system. However, most research has considered only the vibration of the drive system or the vibration of the mill to determine the cause of the accident in the equipment condition monitoring and fault diagnosis process. Condition monitoring and fault diagnosis based on this type of approach can lead to misdiagnosis or missed diagnosis in determining faults in actual systems. So, in this study, a dynamic model of the coupling between a mill and its drive system was developed to study the interaction of the mill and the drive system with the goal of increasing the accuracy of diagnostic methods and to improve the quality of the rolled material. A nonlinear coupling dynamic model was formulated to represent the relation between the gearbox vibration amplitude and various time-varying parameters to study the effects of various parameters on the drive system vibration characteristic under unsteady lubrication. Simulations results showed that increasing the strip speed, the input strip thickness, or the output strip thickness or decreasing the lubricating oil temperature or the roller radius caused the vibration amplitude of the drive system to increase. The vibration frequency caused by variations in the strip inlet or outlet thickness can be transmitted to the drive system, and gear meshing frequency of the gearbox can be transmitted to the mill. Test data from an actual cold rolling mill verified the accuracy of the model. The model was shown to be capable of simulating the mutually coupled and affected mechanism between a mill and its drive system.

scholarly journals Stability Analysis of a Nonlinear Coupled Vibration Model in a Tandem Cold Rolling Mill

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Xing Lu ◽  
Jie Sun ◽  
Guangtao Li ◽  
Zhenhua Wang ◽  
Dianhua Zhang
Keyword(s):  
Hopf Bifurcation ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Vertical Direction ◽  
Rolling Process ◽  
Cold Rolling Mill ◽  
Mass System ◽  
Hopf Bifurcation Point ◽  
Tandem Cold Rolling ◽  
Vibration Model

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 vertical direction and vertical-horizontal directions, or the multiple rolls system is simplified to a single mass system. However, the torsional chatter is also a typical type of mill chatter, and the presence of intermediate roll and backup roll will affect the overall vibration of the mill structure system. In this paper, a newly cold rolling mill vibration model coupled with the dynamic rolling processing model and nonlinear vibration model is proposed with the consideration of dynamic coupling and nonlinear characteristics of the rolling process, multiroll equilibrium, and roll movement in both vertical-horizontal-torsional directions. By using Hopf bifurcation theorem and Routh–Hurwitz determinant, the existence of the Hopf bifurcation point of the mill vibration system and bifurcation characteristics are analyzed. At last, the influence of different rolling conditions on the stability of the coupled mill system is investigated, and these results can also be used to design an optimum rolling schedule and determine the appearance of mill chatter under certain rolling conditions.

Sign in / Sign up

Export Citation Format

Share Document