Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Determination of Optimum Blank Shape to Minimize the Root Gap during TIG Welding in Hot Curvature Forming of Al5083 Thick Plate

열간 곡면성형된 Al5083 후판의 TIG 용접 시 루트갭 최소화를 위한 최적 블랭크 형상 결정

  • 이정민 (부산대학교 정밀가공시스템공학과) ;
  • 고대훈 (부산대학교 정밀가공시스템공학과) ;
  • 이경훈 (부산대학교 PNU-IFAM JRC) ;
  • 이찬주 (한국생산기술연구원 동남권지역본부) ;
  • 김병민 (부산대학교 기계공학과)
  • Received : 2013.03.07
  • Accepted : 2013.06.18
  • Published : 2013.08.01
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Abstract

The hot curvature forming of large aluminum plates is a process used to produce spherical liquefied natural gas (LNG) tanks. In this study, we describe a method to determine the optimum shape of blanks to minimize the root gap in the forming process. The method proposed in this study was applied to a small-scale model for thick plates with a curvature of 1500 mm and thickness of 6 mm. First, the shape of the curved shells was determined as the target shape, and then a coordinate transform was used to determine the optimum blank shape, which was then iteratively modified using the results of finite element method (FEM) simulations, including heat transfer, until the shape error was minimized. Experiments in forming using Al5083 thick plate were carried out, showing that the method can determine the optimum blank shape within an allowable root gap of 0.1 mm.

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References

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