Deformation Type in Forming of Horn Tubes

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  • 異径円管成形における変形様式
  • 異径円管成形における変形様式 : 板からの閉断面部品成形の基礎研究(第1報)
  • イケイエンカン セイケイ ニ オケル ヘンケイ ヨウシキ : イタ カラ ノ ヘイダンメン ブヒン セイケイ ノ キソ ケンキュウ(ダイ1ポウ)
  • ―板からの閉断面部品成形の基礎研究 第1報―
  • ―Fundamental Research for Forming of Closed Section Parts from Sheet Metal Ⅰ―

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Abstract

<p>The purpose of this research is the development of technology to make complex-shape closed-section parts directly from sheet blanks (direct sheet forming). It is expected to form closed-section parts with large expansion of the circumferential length by direct sheet forming. In this paper, the deformation type of horn tubes, which consists of circular, conical and transient portions, is studied. The horn tube is one of the typical shapes for automotive parts. With reference to deformation types in the conventional stamping process, those in the forming process of horn tubes are discussed on the basis of the results of FEM analysis. The validity of FEM analysis is confirmed by comparison with experimental results. It is clarified that the forming process can be broken down into several stages and deformation types (uniform bending of sheet, stretch flanging, axial bending of U-section, deformation into double curved surface and plane-strain compression).</p>

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