Optimization Of V-Bending Of Aluminium Aa6061 Strip Of Non-Uniform Profile Using The Taguchi Method
Automotive manufacturer are now producing ever lighter vehicles. Various techniques have been implemented to achieve this. Thickness variation is one of the effective approach in reducing weight. Formability of the non-uniform thickness section has been overlooked in the forming process of these...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2017
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| Subjects: | |
| Online Access: | http://eprints.usm.my/46491/1/Optimization%20Of%20V-Bending%20Of%20Aluminium%20Aa6061%20Strip%20Of%20Non-Uniform%20Profile%20Using%20The%20Taguchi%20Method.pdf |
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| Summary: | Automotive manufacturer are now producing ever lighter vehicles. Various
techniques have been implemented to achieve this. Thickness variation is one of the
effective approach in reducing weight. Formability of the non-uniform thickness
section has been overlooked in the forming process of these parts. Improper process
and incorrect decision may lead to severe defect and one of the main concerns is a
springback. Springback is a common defect found in sheet metal forming which is
mainly caused by the elastic recovery and redistribution of internal stress during
unloading process. The effect of springback is to change the shape and dimension of
the parts and can create major problem in the assembly. In this study, thickness ratio
and stroke are two main parameters, followed by annealing temperature, rolling
direction and alignment. Optimal parameters obtained using Taguchi Method where
an L18 (61 × 34) orthogonal array with three column and eighteen rows and one
parameter with six level and the other four parameters with three levels. Two profiles
of thickness variation have been studied, tapered and parabolic profiles. The results
for the tapered profile revealed that most significant parameter is stroke which
contribute 87.57% followed by thickness ratio (2.94%), rolling direction (1.89%), the
alignment (0.68%) and annealing temperature (0.42%), and while the result for curved
shape showed that the most significant parameter is lead by stroke with 82.41%
contribution followed by thickness ratio (2.60%), annealing temperature (2.30%),
alignment (0.59%) and rolling direction (0.49%). Based on the result, it can be
concluded that bend angle and thickness ratio are the most significant parameter that
influence the springback behavior of the aluminium strip with non-uniform thickness
section. The optimal combination of A3 B3 C3 D3 E2 for tapered shape and A2 B3
C3 D3 E3 for curved shape can result in minimum springback. |
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