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.

THE MODEL OF THE CONTROL SYSTEM OF STRIP THICKNESS ON PRESSURE SCREWS OF THE FIRST STAND COLD ROLLING MILL

2016 ◽  
Vol 23 (99) ◽  
pp. 10-16
Author(s):  
Oleksii P. Chornyi ◽  
◽  
Sergey A. Debelyy ◽  
Leonid G. Limonov ◽  
Galina A. Sivjakova ◽  
...  
Keyword(s):  
Control System ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Strip Thickness ◽  
Cold Rolling Mill

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.

The Analysis of Influence on the Edge Drop of Tandem Cold Rolling Mill

2014 ◽  
Vol 548-549 ◽  
pp. 363-366
Author(s):  
Xiao Min Zhou ◽  
Xiao Xu Cheng
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Shape Control ◽  
Three Dimensional ◽  
Strip Thickness ◽  
Cold Rolling Mill ◽  
Tandem Cold Rolling ◽  
Flatness Control ◽  
Width Reduction ◽  
Edge Drop

Edge-drop control enlarges the shape control theories and technologies. But compared to the profile and flatness control technology, the edge drop control is a developing topic. This paper analyze the influence of strip thickness, strip width, reduction ratio, friction coefficient and deformation resistance on the edge drop based on the elastic deformation of rolls and the three-dimensional plastic deformation of strip for UCMW cold rolling mill. The results will support the further research on the edge drop control for cold rolling mill.

Developing an effective diagnosis for safety improvement in steelworks

2005 ◽  
Vol 4 (4) ◽  
pp. 229-240
Author(s):  
A.R. Hale ◽  
H.A. v.d. Waterbeemd ◽  
R. Potter ◽  
B.H. Heming ◽  
P.H.J.J. Swuste ◽  
...  
Keyword(s):  
Control System ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Safety Management ◽  
Risk Control ◽  
Cold Rolling Mill ◽  
Rich Picture ◽  
Safety Improvement ◽  
Effective Diagnosis ◽  
Current Risk

The paper describes the methods used for a study of the safety management system and culture of a cold rolling mill in a steel plant. It uses data from diverse sources which can be validated against each other and combined to produce a rich picture of the current risk control system and its shortcomings. The paper also describes the proposed improvements and what the plant chose to implement. This step also throws light on the culture of the plant.

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