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Tube bending with axial pull and internal pressure

机译:带有轴向拉力和内部压力的弯管

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摘要

Tube bending is a widely used manufacturing process in the aerospace, automotive, and other industries. During tube bending, considerable in-plane distortion and thickness variation occurs. The thickness increases at the intrados (surface of tube in contact with the die) and it reduces at the extrados (outer surface of the tube). In some cases, when the bend die radius is small, wrinkling occurs at the intrados. In industry a mandrel is used to eliminate wrinkling and reduce distortion. However, in the case of a close bend die radius, use of a mandrel should be avoided as bending with the mandrel increases the thinning of the wall at the extrados, which is undesirable in the manufacturing operation. The present research focuses on additional loadings such as axial force and internal pressure which can be used to achieve better shape control and thickness distribution of the tube. Based on plasticity theories, an analytical model is developed to predict cross section distortion and thickness change of tubes under various loading conditions. Results from both the FEA and analytical model indicated that at the intrados the increase in thickness for bending with internal pressure and bending with combined axial pull and internal pressure was nearly the same. But in the case of bending with the combination of axial pull and internal pressure there was a significant reduction of thickness at the extrados. A parametric study was conducted for the case of bending with combined internal pressure and axial pull and it was seen that with proper selection of the pressure and axial pull wrinkling can be eliminated, thickness distribution around the tube can be optimized, and cross section distortion of the tube can be reduced. Predictions of the analytical model are in good agreement with finite element simulations and published experimental results. The model can be used to evaluate tooling and process design in tube bending.
机译:弯管是在航空航天,汽车和其他行业中广泛使用的制造过程。在弯管期间,会发生相当大的面内变形和厚度变化。厚度在内部(管与模具接触的表面)处增加,而在外部(管的外表面)处减小。在某些情况下,当弯曲模具的半径较小时,在槽内会发生起皱。在工业上,芯棒用于消除皱纹并减少变形。然而,在弯曲模具半径较小的情况下,应避免使用心轴,因为随着心轴的弯曲会增加在拱口处壁的变薄,这在制造操作中是不希望的。目前的研究集中在额外的载荷,例如轴向力和内部压力,这些载荷可用于实现更好的形状控制和管的厚度分布。基于可塑性理论,开发了一种分析模型来预测在各种载荷条件下管材的截面变形和厚度变化。有限元分析和分析模型的结果均表明,在内部,内压弯曲的厚度和轴向拉力和内压组合的弯曲厚度几乎相同。但是,在结合轴向拉力和内部压力进行弯曲的情况下,拱顶处的厚度明显减小。对内压和轴向拉力相结合的弯曲情况进行了参数研究,结果发现,通过适当选择压力和轴向拉力,可以消除皱纹,可以优化管子周围的厚度分布,并减小截面变形。可以减少管子。分析模型的预测与有限元模拟和已发表的实验结果非常吻合。该模型可用于评估弯管中的工具和工艺设计。

著录项

  • 作者

    Agarwal Rohit;

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  • 年度 2004
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  • 原文格式 PDF
  • 正文语种 en_US
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