Centered coined-bead technique for precise U-bent part fabrication
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Publication Details
Author list: Phanitwong W., Thipprakmas S.
Publisher: Springer
Publication year: 2016
Journal: International Journal of Advanced Manufacturing Technology (0268-3768)
Volume number: 84
Issue number: #
Start page: 2139
End page: 2150
Number of pages: 12
ISSN: 0268-3768
eISSN: 1433-3015
Languages: English-Great Britain (EN-GB)
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Abstract
Recently, during the fabrication of U-bent parts, increasing levels of precision have been required not only for the bend angle of the part but also for the bend radius and the flatness of its bottom surface. The conventional coined-bead technique is therefore unlikely to be applied to achieve these requirements. As an innovative variation of the coined-bead technique, the centered coined-bead technique is proposed and investigated in this study. The finite element method (FEM) was used to clearly identify the parameters of interest based on a stress distribution analysis. The results show that the centered coined-bead formation could be applied to produce a balance between the bending and reversed bending characteristics and to eliminate these characteristics in the bottom surface. Therefore, a precise bend angle and bend radius and a flat bottom surface could be achieved. The effects of the coined-bead geometry and its positioning are also examined and clearly identified, and laboratory experiments were carried out to validate the FEM simulation results. Each U-bent part could be fabricated with a precise bend angle and bend radius and a flat bottom surface using the centered coined-bead technique. The recommended coined-bead geometry and positioning are also reported. ฉ 2015, Springer-Verlag London.
Keywords
Coined bead
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