Gas forming a V-shape aluminum sheet into a trough of saddle-contour

Shyong Lee, Hsien Chin Lan, Jye Lee, Jian Yih Wang, J. C. Huang, Chun Lin Chu

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


A sheet metal trough of aluminum alloys is manufactured by gas-forming process at 500 °C. The product with slope walls is of ∼1.2 m long and ∼260 mm opening width, comprising two conical sinks at two ends. The depth of one sink apex is ∼350 mm, which results in the depth/width ratio reaching 1.4. To form such a complex shape with high aspect ratio, a pre-form of V-shape groove is prepared prior to the gas-forming work. When this double concave trough is turned upside down, the convex contour resembles the back of a twin hump camel. The formability of this configuration depends on the gas pressurization rate profile, the working temperature, material's micro-structure, as well as pre-form design. The latter point is demonstrated by comparing two aluminum alloys, AA5182 and SP5083, with nearly same compositions but very different grain sizes.

Original languageEnglish
Pages (from-to)2290-2294
Number of pages5
JournalJournal of Materials Engineering and Performance
Issue number11
StatePublished - Nov 2012


  • Camel-back
  • Saddle-contour
  • SP5083
  • Superplastic
  • Twin humps
  • V-shape


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