scholarly journals Risk analysis causing downtimes in production process of hot rolling mill

2017 ◽  
Author(s):  
Marcela Malindzakova ◽  
Dagmar Caganova ◽  
Andrea Rosova ◽  
Dusan Malindzak
Keyword(s):  
Risk Analysis ◽  
Production Process ◽  
Hot Rolling ◽  
Rolling Mill ◽  
Hot Rolling Mill

Analysis of interconnections between technical systems on hierarchically connected technological levels of steel sheet production by hot rolling

2020 ◽  
Vol 76 (8) ◽  
pp. 847-855
Author(s):  
E. N. Shiryaeva ◽  
M. A. Polyakov ◽  
D. V. Terent'ev
Keyword(s):  
Hot Rolling ◽  
Systems Analysis ◽  
Rolling Mill ◽  
Steel Sheet ◽  
Technological System ◽  
Necessary Condition ◽  
Rolled Sheet ◽  
Technological Systems ◽  
Hot Rolling Mill ◽  
Technical Systems

Complexity of modern metallurgical plants, presence of great number of horizontal and vertical interactions between their various structural subdivisions makes it necessary to apply a systems analysis to elaborate effective measures for stable development of a plant operation. Among such measures, digitalization of a plant is widespread at present. To implement the digitalization it is necessary to have clear vision about links at all the levels of the technological system of a plant. A terminology quoted, accepted in the existing regulatory documents for defining of conceptions, comprising the technological system. It was shown, that the following four hierarchical levels of technological systems are distinguished: technological systems of operations, technological systems of processes, technological systems of production subdivisions and technological systems of plants. A hierarchical scheme of technological systems of hot-rolled sheet production at an integrated steel plant presented. Existing horizontal and vertical links between the basic plant’s shops shown. Peculiarities of flows of material, energy and information at the operation “rolling” of the technological system “hot rolling of a steel sheet” considered. As a technical system of the technological process of the hot rolling, the hot rolling mill was chosen. A structural diagram of the hot rolling mill was elaborated, the mill being consisted of reheating furnaces, roughing and finishing stand groups, with an intermediate roll-table between them, and down-coilers section. Since the rolling stands are the basic structural elements of the hot rolling mill, structural diagrams of a roughing and a finishing stands were elaborated. Results of the systems analysis of the technological and technical systems, hierarchically linked in the process of steel sheet hot rolling, can be applied for perfection of organization structure of the whole plant, as well as for elaboration mathematical models of a system separate elements functioning, which is a necessary condition for a plant digitalization.

scholarly journals Vibration Characteristics of Hot Rolling Mill Rolls Based on Elastoplastic Hysteretic Deformation

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 869
Author(s):  
Rongrong Peng ◽  
Xingzhong Zhang ◽  
Peiming Shi
Keyword(s):  
Hot Rolling ◽  
Internal Resonance ◽  
Rolling Mill ◽  
Rolling Force ◽  
Subharmonic Resonance ◽  
Force Model ◽  
Maximum Lyapunov Exponent ◽  
Vibration System ◽  
Hot Rolling Mill ◽  
Rolling Mill Vibration

Based on the analysis of the influence of roll vibration on the elastoplastic deformation state of a workpiece in a rolling process, a dynamic rolling force model with the hysteresis effect is established. Taking the rolling parameters of a 1780 mm hot rolling mill as an example, we analyzed the hysteresis between the dynamic rolling force and the roll vibration displacement by varying the rolling speed, roll radius, entry thickness, front tension, back tension, and strip width. Under the effect of the dynamic rolling force and considering the nonlinear effect between the backup and work rolls as well as the structural constraints on the rolling mill, a hysteretic nonlinear vertical vibration model of a four-high hot rolling mill was established. The amplitude-frequency equations corresponding to 1/2 subharmonic resonance and 1:1 internal resonance of the rolling mill rolls were obtained using a multi-scale approximation method. The amplitude-frequency characteristics of the rolling mill vibration system with different parameters were studied through a numerical simulation. The parametric stiffness and nonlinear stiffness corresponding to the dynamic rolling force were found to have a significant influence on the amplitude of the subharmonic resonance system, the bending degree of the vibration curve, and the size of the resonance region. Moreover, with the change in the parametric stiffness, the internal resonance exhibited an evident jump phenomenon. Finally, the chaotic characteristics of the rolling mill vibration system were studied, and the dynamic behavior of the vibration system was analyzed and verified using a bifurcation diagram, maximum Lyapunov exponent, phase trajectory, and Poincare section. Our research provides a theoretical reference for eliminating and suppressing the chatter in rolling mills subjected to an elastoplastic hysteresis deformation.

Signal-Based Diagnosis of Torsional Vibration of a Hot Rolling Mill Main Drive

2004 ◽  
Vol 37 (15) ◽  
pp. 185-190 ◽  
Author(s):  
Ioana Fagarasan ◽  
Samir Taleb ◽  
Suzanne Lesecq ◽  
Sylviane Gentil ◽  
R. Stuecher
Keyword(s):  
Hot Rolling ◽  
Torsional Vibration ◽  
Rolling Mill ◽  
Hot Rolling Mill

Technology for the hot rolling of strip after modernization of the laminar-cooling unit on the roller conveyor of the 2500 hot-rolling mill

Metallurgist ◽  
2007 ◽  
Vol 51 (1-2) ◽  
pp. 41-45 ◽  
Author(s):  
S. V. Denisov ◽  
S. N. Gorshkov ◽  
A. V. Shargunov ◽  
G. N. Posazhennikov ◽  
V. V. Galkin
Keyword(s):  
Hot Rolling ◽  
Rolling Mill ◽  
Laminar Cooling ◽  
Roller Conveyor ◽  
Cooling Unit ◽  
Hot Rolling Mill
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