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Assessment of best scheduling practice in continuous casting and hot rolling of stainless steel strip by system dynamics simulation
Dalarna University, School of Technology and Business Studies, Material Science.
2007 (English)In: Key Engineering Materials, ISSN 1013-9826, E-ISSN 1662-9795, Vol. 344, p. 897-904Article in journal (Refereed) Published
Abstract [en]

A rapid flow of materials with little intermediate buffering between steel mill and hot strip mill has many benefits. One is energy savings due to raised charging temperature in the reheat furnaces of the hot strip mill. Another is that tied capital is freed up, thereby improving mill economy. Still, it is not unusual that average lead-time is in the order of days, or even weeks. The aim of the present work was to show how lead-times from casting to rolling could be improved by changes in the scheduling function. A System Dynamics model of a stainless steel strip production facility with continuous caster and hot rolling mill was created. The model was used to study the dynamics of the system in response to changes in parameters that defined the scheduling configuration. More frequent schedule updating generally resulted in less work in process (WIP) and shorter lead times from casting to rolling, with resulting higher charging temperatures. The amount of oscillation in the system was also reduced. More frequent work roll changes were required when scheduling frequency increased, resulting in an increased fraction of setup time in relation to total processing time. Therefore, a development towards increased scheduling frequency may have to be complemented by efforts to reduce changeover times. The conclusion was that dynamic scheduling routines with frequent schedule updating result in better overall performance of the system due to lower WIP and better heat utilization. Dynamic scheduling routines with frequent updates make the system respond better to changes in the system and give better overall performance. The result is lower WIP, increased energy efficiency and less oscillation in the system.

Place, publisher, year, edition, pages
2007. Vol. 344, p. 897-904
Keywords [en]
Hot rolling, continuous casting, hot charging, stainless steel, production scheduling, simulation, system dynamics
National Category
Materials Engineering
Research subject
Stålformning och ytteknik, Operativa strategier för förbättrad produktivitet vid tillverkning av rostfria band
Identifiers
URN: urn:nbn:se:du-2908ISI: 000247343400110OAI: oai:dalea.du.se:2908DiVA, id: diva2:519864
Conference
12th International Conference on Sheet Metal (SheMet 2007), Palermo, Italy, April 1-4, 2007
Available from: 2007-08-15 Created: 2007-08-15 Last updated: 2017-12-07Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf