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      Scheduling in a three-machine robotic flexible manufacturing cell

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      Author
      Gultekin, H.
      Akturk, M. S.
      Karasan, O. E.
      Date
      2007
      Source Title
      Computers & Operations Research
      Print ISSN
      0305-0548
      Electronic ISSN
      1873-765X
      Publisher
      Elsevier
      Volume
      34
      Issue
      8
      Pages
      2463 - 2477
      Language
      English
      Type
      Article
      Item Usage Stats
      108
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      122
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      Abstract
      In this study, we consider a flexible manufacturing cell (FMC) processing identical parts on which the loading and unloading of machines are made by a robot. The machines used in FMCs are predominantly CNC machines and these machines are flexible enough for performing several operations provided that the required tools are stored in their tool magazines. Traditional research in this area considers a flowshop type system. The current study relaxes this flowshop assumption which unnecessarily limits the number of alternatives. In traditional robotic cell scheduling literature, the processing time of each part on each machine is a known parameter. However, in this study the processing times of the parts on the machines are decision variables. Therefore, we investigated the productivity gain attained by the additional flexibility introduced by the FMCs. We propose new lower bounds for the 1-unit and 2-unit robot move cycles (for which we present a completely new procedure to derive the activity sequences of 2-unit cycles in a three-machine robotic cell) under the new problem domain for the flowshop type robot move cycles. We also propose a new robot move cycle which is a direct consequence of process and operational flexibility of CNC machines. We prove that this proposed cycle dominates all 2-unit robot move cycles and present the regions where the proposed cycle dominates all 1-unit cycles. We also present a worst case performance bound of using this proposed cycle.
      Keywords
      Automated manufacturing
      Cyclic scheduling
      Robotic cell
      Permalink
      http://hdl.handle.net/11693/23410
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.cor.2005.09.015
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