Stochastische Hill-Climbing-Algorithmen zur Produktionssteuerung von Grobblechwalzstraßen (Production Scheduling of Heavy Plate Rolling Mills by Stochastic Hill-Climbing-Algorithms)

2008 ◽  
Vol 56 (4/2008) ◽  
Author(s):  
Heike Busch
Keyword(s):  
Production Scheduling ◽  
Hill Climbing ◽  
Rolling Mills ◽  
Heavy Plate ◽  
Plate Rolling ◽  
Hill Climbing Algorithms

scholarly journals Advancement of Roll-Gap Control to Curb the Camber in Heavy-Plate Rolling Mills

2021 ◽  
Vol 11 (19) ◽  
pp. 8865
Author(s):  
Andrey A. Radionov ◽  
Vadim R. Gasiyarov ◽  
Alexander S. Karandaev ◽  
Boris M. Loginov ◽  
Vadim R. Khramshin
Keyword(s):  
Large Diameter ◽  
Exit Point ◽  
Rolling Mills ◽  
Heavy Plate ◽  
Plate Rolling ◽  
Geometric Precision ◽  
The Asymmetry ◽  
The Difference ◽  
Edge Trimming ◽  
Roll Gap

The quality of steelwork products depends on the geometric precision of flat products. Heavy-plate rolling mills produce plates for large-diameter pipes and for use in shipbuilding, mechanical engineering, and construction. This is why the precision requirements are so stringent. Today’s Mills 5000 produce flat products of up to 5 m in width; the operation of these units shows ‘camber’ defects and axial shift of the roll at the stand exit point. This induces greater loss of metal due to edge trimming and involves a higher risk of accidents. These defects mainly occur due to the asymmetry in the roll gap, which is in turn caused by their misalignment in rolling. As a result, the feed varies in gauge, and the strip moves unevenly. The paper’s key contribution consists in theoretical and experimental substantiation and development of a set of control methods intended to address roll-gap asymmetry. The methods effectively compensate for the asymmetry resulting from the “inherited” wedge, which preexists before the strip enters the stand. They also compensate for the “ongoing” roll misalignment that is caused by the difference in force on the opposite side of the stand during rolling. This comprehensive approach to addressing camber and axial displacement of the feed has not been found in other sources. This paper presents a RAC controller connection diagram that ensures that the roll gap is even across the feed. The paper notes the shortcomings of the design configuration of the controller and shows how it could be improved. The authors have developed a predictive roll-gap asymmetry adjustment method that compensates for the deviations in gauge during the inter-passage pauses. They have also developed a method to control gap misalignment during rolling. The paper showcases the feasibility of a proportional-derivative RAC. The methods have been tested by mathematical modeling and experimentally. The paper further shows oscillograms sampled at Mill 5000 after implementing the developed solutions. Tests confirm far better precision of the screw-down mechanisms on the opposite sides of the stand. This reduces the variation in gauge across the feed and thus curbs the camber defect. As a result, the geometry of the flat improves, and less metal is lost in trimming. The paper further discusses how the RAC controller interacts with the automatic gauge control system. The conclusion is that these systems do not interfere with each other. The developed systems have proceeded to pilot testing.

scholarly journals Systems of control and diagnostics in integrated APCS of heavy-plate mills.

2021 ◽  
Vol 4 ◽  
pp. 58-69
Author(s):  
G.G. Grabovsky ◽  
◽  
M.G. Ievlev ◽  
S.Ye. Moiseienko ◽  
◽  
...  
Keyword(s):  
Control Systems ◽  
Residual Life ◽  
Technical Condition ◽  
Economic Effects ◽  
Mechanical Equipment ◽  
Diagnostic Systems ◽  
Rolling Mills ◽  
Heavy Plate ◽  
Plate Rolling ◽  
Resource Characteristics

Diagnosing the equipment of complex technological installations is a guarantee of their safe and efficient performance. The aims of the diagnostic systems creation are the following: timely prevention of possible failures and malfunctions of systems and equipment; the necessi-ty of having a complete and holistic picture of the actual technical condition of the operating systems and equipment; high accuracy forecasting of the residual life of the equipment; minimization of cost and increase of efficiency of works on technical conditions monitoring, maintenance, repairs and management of resource characteristics of systems and equipment; continuous improvement, based on objective performance data, actual characteristics of safety, reliability and operational readiness. To such complex technological installations there belongs the equipment of hot rolling shops, for example, mechanical equipment of the mill, electric drive with control systems, devices and control systems for hydraulics, lubrication and cooling management, ventilation stations, pumping stations; switchgear cells (high voltage switches), complex of APCS of heavy-plate mills rolling technical means. The article considers some methods of operational control of the technical condition of the heavy-plate rolling mills equipment. The factors that influence the efficiency of the diagnostic algorithms used in the APCS, in particular, the organization of collection and processing of statistical data on the possibilities of malfunctions and the costs of their search and elimination are determined in the paper. Formalization of methods for construction and description of mathematical models of the object of diagnostics is performed. Utilization of the subsystem of control and diagnostics in the APCS of modern rolling mills provides a significant improvement in the reliability of the APCS of heavy-plate mills rolling, as well as some economic effects.

A vision-based material tracking system for heavy plate rolling mills

2007 ◽  
Author(s):  
Mark Tratnig ◽  
Johann Reisinger ◽  
Helmut Hlobil
Keyword(s):  
Tracking System ◽  
Rolling Mills ◽  
Heavy Plate ◽  
Plate Rolling

scholarly journals The Analysis of the Asymmetric Plate Rolling Process in the Finishing Stand 3600/ Analiza Asymetrycznego Procesu Walcowania Blach Grubych W Klatce Wykańczającej 3600

2014 ◽  
Vol 59 (4) ◽  
pp. 1533-1538
Author(s):  
A. Kawałek ◽  
H. Dyja ◽  
M. Knapinski ◽  
G. Banaszek ◽  
M. Kwapisz
Keyword(s):  
Process Parameters ◽  
Rotational Speed ◽  
Shape Factor ◽  
Rolling Process ◽  
Asymmetry Factor ◽  
Asymmetric Rolling ◽  
Rolling Mills ◽  
Plate Rolling ◽  
Strip Shape ◽  
Roll Gap

Abstract In order to enhance the quality of plates, various solutions are being implemented, including normalizing rolling, the process of rolling followed by accelerated cooling, as well as new roll gap control systems. The hydraulic positioning of rolls and the working roll bending system can be mentioned here. The implementation of those systems results in increased loads of the rolling stands and working tools, that is the rolls. Another solution aimed at enhancing the cross-sectional and longitudinal shape of rolled plate is the introduction of asymmetric rolling, which consists in the intentional change of the stress and strain state in the roll gap. Asymmetric rolling systems have been successfully implemented in strip cold rolling mills, as well as in sheet hot rolling mills. The paper present results of studies on the effect of roll rotational speed asymmetry and other rolling process parameters on the change in the shape of rolled strip and the change of rolls separating force for the conditions of normalizing rolling of plates in the finishing stand. The variable process parameters were: the roll rotational speed asymmetry factor, av; the strip shape factor, h0/D; and the relative rolling reduction, ε. Working rolls of the diameter equal to 1000 mm and a constant lower working roll rotational speed of n = 50 rpm were assumed for the tests. The asymmetric rolling process was run by varying the rotational speed of the upper roll, which was lower than that of the lower roll. The range of variation of the roll rotational speed factor, av =vd/vg, was 1.01÷1.15. A strip shape factor of h0/D = 0.05÷0.014 was assumed. The range of rolling reductions applied was ε = 0.08÷0.50. The material used for tests was steel of the S355J2G3 grade. For the simulation of the three-dimensional plastic flow of metal in the roll gap during the asymmetric hot rolling of plates, the mathematical model of the FORGE 2008 ® program was used. For the mathematical description of the effect of rolling parameters on the strip curvature and rolls separating force the special multivariable polynomial interpolation was used. This method of tensor interpolation in Borland Builder programming environment was implemented. On the basis of the carried out analysis can be state, that by using the appropriate relative rolling reduction and working roll peripheral speed asymmetry factor for a given feedstock thickness (strip shape ratio) it is possible to completely eliminate the unfavorable phenomenon of strip bending on exit from the roll gap, or to obtain the permissible strip curvature which does not obstructs the free feed of the strip to the next pass or transferring the plate to the accelerated plate cooling stations. Additionally by introducing the asymmetric plate rolling process through differentiating working roll peripheral speeds, depending on the asymmetry factor used, the magnitude of the total roll separating force can be reduced and, at the same time, a smaller elastic deflection of rolling stand elements can be achieved. As a result smaller elastic deflection of the working rolls, smaller dimensional deviations across its width and length finished plate can be obtained.

Simulation of central crack closing behavior during ultra-heavy plate rolling

2009 ◽  
Vol 47 (2) ◽  
pp. 439-447 ◽  
Author(s):  
Wei Deng ◽  
De-wen Zhao ◽  
Xiao-mei Qin ◽  
Lin-xiu Du ◽  
Xiu-hua Gao ◽  
...  
Keyword(s):  
Central Crack ◽  
Heavy Plate ◽  
Plate Rolling

scholarly journals Simulation-as-a-Service for Reinforcement Learning Applications by Example of Heavy Plate Rolling Processes

2020 ◽  
Vol 51 ◽  
pp. 897-903
Author(s):  
Christian Scheiderer ◽  
Timo Thun ◽  
Christian Idzik ◽  
Andrés Felipe Posada-Moreno ◽  
Alexander Krämer ◽  
...  
Keyword(s):  
Reinforcement Learning ◽  
Heavy Plate ◽  
Plate Rolling
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