Optimal Scheduling of Transient Cycles for Single-Armed Cluster Tools With Parallel Chambers

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Cluster tools have been extensively used for many semiconductor manufacturing processes such as lithograph, etching, deposition, and testing. Most previous studies on cluster tool scheduling have focused on steady cycles in which cluster tools repeat identical work cycles. However, the proportion of noncyclic transient operation cycles such as start-up cycles and close-down cycles becomes larger as the lot size tends to be smaller. We examine optimal transient scheduling for a single-armed cluster tool, in which there are parallel chambers and a process chamber is a bottleneck, while minimizing the makespan of a lot. To do this, we first identify fundamental properties of noncyclic transient cycles in a tool by analyzing resource workloads. We then propose a simple robot task sequence, a generalized backward sequence, which performs backward operations incrementally for start-up cycles and decrementally for close-down cycles. We also develop workload-based conditions for which the generalized backward sequence has the minimum makespan for single-armed cluster tools with parallel chambers. Finally, we develop a linear programming model to find the minimum makespan of the generalized backward sequence for the cases in which the conditions are not met and show its effectiveness.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2016-04
Language
English
Article Type
Article
Citation

IEEE TRANSACTIONS ON AUTOMATION SCIENCE AND ENGINEERING, v.13, no.2, pp.1165 - 1175

ISSN
1545-5955
DOI
10.1109/TASE.2015.2443107
URI
http://hdl.handle.net/10203/209355
Appears in Collection
IE-Journal Papers(저널논문)
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