Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-14450
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Main Title: Sequencing and Scheduling in Coil Coating with Shuttles
Author(s): Höhn, Wiebke
König, Felix G.
Lübbecke, Marco E.
Möhring, Rolf H.
Type: Research Paper
URI: https://depositonce.tu-berlin.de/handle/11303/15677
http://dx.doi.org/10.14279/depositonce-14450
License: http://rightsstatements.org/vocab/InC/1.0/
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 coatings may necessitate time-consuming setup work. In most coating stages one can choose between two parallel color tanks in order to reduce setup times. As a complicating consequence, setup times for a coil may depend on the whole sequence of predecessors. 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 which 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.
Subject(s): coil coating
sequencing
scheduling
real-world application
steel
Issue Date: 2009
Date Available: 17-Dec-2021
Language Code: en
DDC Class: 510 Mathematik
Series: Preprint-Reihe des Instituts für Mathematik, Technische Universität Berlin
Series Number: 2009, 01
ISSN: 2197-8085
TU Affiliation(s): Fak. 2 Mathematik und Naturwissenschaften » Inst. Mathematik
Appears in Collections:Technische Universität Berlin » Publications

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