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Integrated Sequencing and Scheduling in Coil Coating

Author

Listed:
  • Wiebke Höhn

    (Institut für Mathematik, Technische Universität Berlin, 10623 Berlin, Germany)

  • Felix G. König

    (Institut für Mathematik, Technische Universität Berlin, 10623 Berlin, Germany)

  • Rolf H. Möhring

    (Institut für Mathematik, Technische Universität Berlin, 10623 Berlin, Germany)

  • Marco E. Lübbecke

    (Department of Operations Research, RWTH Aachen University, 52056 Aachen, Germany)

Abstract

We consider a complex planning problem in integrated steel production. A sequence of coils of sheet metal needs to be color coated in consecutive stages. Different coil geometries and changes of colors necessitate time-consuming setup work. In most coating stages one can choose between two parallel color tanks. This can either reduce the number of setups needed or enable setups concurrent with production. A production plan comprises the sequencing of coils and the scheduling of color tanks and setup work. The aim is to minimize the makespan for a given set of coils. We present an optimization model for this integrated sequencing and scheduling problem. A core component is a graph theoretical model for concurrent setup scheduling. It is instrumental for building a fast heuristic that is embedded into a genetic algorithm to solve the sequencing problem. The quality of our solutions is evaluated via an integer program based on a combinatorial relaxation, showing that our solutions are within 10% of the optimum. Our algorithm is implemented at Salzgitter Flachstahl GmbH, a major German steel producer. This has led to an average reduction in makespan by over 13% and has greatly exceeded expectations. This paper was accepted by Dimitris Bertsimas, optimization.

Suggested Citation

  • Wiebke Höhn & Felix G. König & Rolf H. Möhring & Marco E. Lübbecke, 2011. "Integrated Sequencing and Scheduling in Coil Coating," Management Science, INFORMS, vol. 57(4), pages 647-666, April.
    • Handle: RePEc:inm:ormnsc:v:57:y:2011:i:4:p:647-666
    DOI: 10.1287/mnsc.1100.1302
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    References listed on IDEAS

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