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首页> 外文期刊>The International Journal of Advanced Manufacturing Technology >Experimental and numerical study on hydroforming characteristics of friction stir welded aluminum alloy tubes
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Experimental and numerical study on hydroforming characteristics of friction stir welded aluminum alloy tubes

机译：搅拌摩擦铝合金管液压成形特性的实验与数值研究。

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摘要

Friction stir welding (FSW), as a solid state joining technique, has emerged as an efficient method for manufacturing tailor-welded blanks to optimize weight or performance in the final component. As the basic design of lightweight frame structures in the automotive and aircraft industry is frequently based on tubular profiles, the joining strategies and forming technologies have to be developed accordingly. In the present study, FSW tube was produced by a novel processing sequence. The plastic deformation characteristics during hydroforming were experimentally and numerically investigated with two types of end condition. The hydroforming performance of the FSW tubes was mainly investigated by die-bulge forming with fixed ends, and the wrinkling behavior during hydroforming was analyzed by employing axial feed on the tube ends. It is found that hydroforming FSW tube is a new deal and does show a few peculiarities. The FSW tube exhibits a spiral weld and the basin-shaped nugget. Finegrained structure is retained during tube forming. The thinning of the tube in axial direction shows M-shaped distribution during hydroforming. The severe thinning is observed at one quarter of the expansion zone from symmetry plane. In the hoop direction, the base material near the weld suffers severe thinning due to the high hoop and axial tensile stress. The thickness distribution greatly depends on the sequence of the contacting die and the variations of the curvature radius of the tube during hydroforming. Moreover, the weld shows an inhibitory effect for the generation of the wrinkles and decreases the number of the wrinkles as compared to the seamless tube during hydroforming. This effect is more obvious when the forming pressure is lower.
机译：摩擦搅拌焊接（FSW）作为一种固态连接技术，已成为一种有效的方法，用于制造拼焊板，以优化最终部件的重量或性能。由于汽车和飞机工业中轻型框架结构的基本设计经常基于管状轮廓，因此必须相应地开发连接策略和成型技术。在本研究中，FSW管是通过新的加工顺序生产的。在两种端部条件下，通过实验和数值研究了液压成形过程中的塑性变形特性。 FSW管的液压成形性能主要通过固定端部的凸模成形来研究，并通过在管端采用轴向进给来分析液压成形过程中的起皱行为。发现液压成形FSW管是一项新交易，确实显示出一些特殊之处。 FSW管具有螺旋焊缝和盆形熔核。在管材成型过程中会保留细颗粒的结构。管的轴向变细在液压成形过程中显示出M形分布。在距离对称平面四分之一的扩展区观察到严重的变薄现象。在环向方向上，由于高环向和轴向拉伸应力，焊缝附近的基础材料会严重变薄。厚度分布在很大程度上取决于接触模具的顺序以及液压成形过程中管的曲率半径的变化。而且，与液压成形时的无缝管相比，焊缝对皱纹的产生具有抑制作用，并且减少了皱纹的数量。当成形压力较低时，这种效果更加明显。

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