Optimisation of the squeeze forming process
This thesis presents the optimisation of the squeeze forming process, considering both the thermal and mechanical aspects. The Finite Element Method has been used to simulate the process and a Genetic Algorithm was used as an optimisation tool. The thermal optimisation has been applied to the...
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| Format: | Thesis |
| Language: | English |
| Published: |
2006
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7430/1/24p%20ROSLI%20AHMAD.pdf |
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| Summary: | This thesis presents the optimisation of the squeeze forming process, considering both
the thermal and mechanical aspects. The Finite Element Method has been used to
simulate the process and a Genetic Algorithm was used as an optimisation tool.
The thermal optimisation has been applied to the squeeze f0Il11ing process to
achieve near simultaneous solidification in the cast part. The positions of the coolant
channels were considered as design variables in order to achieve such an objective. The
fOllllulation of the objective functions involved two points and also considered the whole
domain. The validation aspects of the optimisation of the casting processes for 2D and
axi-symmetric problems were presented. The influence of the interfacial heat transfer
coefficient related to optimisation of the process was explored.
For the multi-objective optimisation problem, the objective was to achie\'e ncar
simultaneous solidification in the cast part and also near unifoIl11 \'on ivlises stress
distribution in the die for the first and also tenth cycles. This is because it has been found
that the process starts to reach cyclic stabilisation after the tenth cycle. The comparison
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between the design obtained froin the practical solution derived from the optimisation
process and also the design which has been applied in industry was also discussed.
The Design Sensitivity Analysis and Design Element Concept have been applied
to the squeeze f0Il11ing process. For parameter sensitivity analysis, the Youngs Modulus
was considered as a design variable. A few design element subdivisions have been
employed to explore its application to the process. For shape sensitivities involving the
coolant channels, the parametelisation was required in order to consider the coolant
channel as an entity. The extent to which the tendency to move the coolant channel either
in the X or Y -direction with respect to the particular von Mises stress constraint in the die
was also discussed. |
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