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|Title: ||An investigation into tooling requirements and strategies for FMS operation|
|Authors: ||Silva, Silvio do Carmo|
|Issue Date: ||1988|
|Publisher: ||© Silvio do Carmo Silva|
|Abstract: ||A study of the minimum tooling requirements and strategies for efficient
operation of Flexible Manufacturing Systems, FMS's, in Assembly set
Production, ASP, i.e production in sets of parts to completely assemble one or
more product units, is presented in this research work.
The main investigating tool is a simulation model. With this model the tool
groups to be loaded into machines and fixtured pallet requirements were
studied in conjunction with two scheduling rules. One is a FCFS rule and the
other is a new rule, called MRPAS, which schedules work on the basis of the
number of parts still unfinished belonging to an Assembly Set.
The results of the research work show that ASP can be efficiently carried
out in FMS's. However this requires that a good system set-up and adequate
operating strategies are used. In particular appropriate tooling levels and
good tooling configurations,TC's, i.e. combinations of tools in groups to be
loaded into the machines, must be established to achieve high FMS
performance. Tooling combination and duplication heuristic rules and the
simulation model can be used for achieving this aim. The heuristic approach
is shown to be necessary due to the impossibility, in a reasonable time, of
evaluating the performance of FMS's under the large number of alternative
tooling configurations which are possible.
The level of fixtured pallets used can also have a great influence on system
performance. Appropriate levels of these resources to operate FMS's for
given TC's can be established using the methodology developed in this work.
It is also important that good scheduling rules are used. In the cases studied,
the MRPAS rule produces the best performance expressed as the
combination of FMS utilization and production of complete assembly sets.
Moreover a very small assembly set batch size, ASBS, i.e. number of AS
released together into the FMS, is likely to be preferable. In the cases studied
an ASBS of one performed best overall.|
|Description: ||A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University|
|Appears in Collections:||PhD Theses (Mechanical, Electrical and Manufacturing Engineering)|
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