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      Pure cycles in flexible robotic cells

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      Author
      Gultekin, H.
      Karasan O. E.
      Akturk, M. S.
      Date
      2009
      Source Title
      Computers & Operations Research
      Print ISSN
      0305-0548
      Electronic ISSN
      1873-765X
      Publisher
      Elsevier
      Volume
      36
      Issue
      2
      Pages
      329 - 343
      Language
      English
      Type
      Article
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      Abstract
      In this study, an m-machine flexible robotic manufacturing cell consisting of CNC machines is considered. The flexibility of the machines leads to a new class of robot move cycles called the pure cycles. We first model the problem of determining the best pure cycle in an m-machine cell as a special travelling salesman problem in which the distance matrix consists of decision variables as well as parameters. We focus on two specific cycles among the huge class of pure cycles. We prove that, in most of the regions, either one of these two cycles is optimal. For the remaining regions we derive worst case performances of these cycles. We also prove that the set of pure cycles dominates the flowshop-type robot move cycles considered in the literature. As a design problem, we consider the number of machines in a cell as a decision variable. We determine the optimal number of machines that minimizes the cycle time for given cell parameters such as the processing times, robot travel times and the loading/unloading times of the machines.
      Keywords
      Flexible manufacturing systems
      CNC
      Industrial robots
      Cellular automation
      Optimization
      Production control
      Permalink
      http://hdl.handle.net/11693/22844
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.cor.2007.10.007
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      • Department of Industrial Engineering 685
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