Theoretical and experimental analysis of stroke-controlled tube hydroforming
Theoretical and experimental analysis of stroke-controlled tube hydroforming
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DOI：
10.1016/s0921-5093(99)00646-2
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发表时间：
2000-02
期刊：
影响因子：
6.4
通讯作者：
N. Asnafi;Anders Skogsgårdh
中科院分区：
文献类型：
--
作者：
N. Asnafi;Anders Skogsgårdh
为了选择管件液压成形而不是传统制造，必须了解管件材料在液压成形过程中的行为和摩擦学效应，以及如何控制液压成形操作本身。液压成形操作是力或行程控制的。本文研究了行程控制液压成形。液压成形包括自由成形和校准。本文只讨论所谓的自由成形。对控制行程自由成形进行了理论和实验研究。理论部分包括分析建模和有限元模拟。所进行的实验是用来显示可能发生的错误的类型，当理论上获得的加载路径被转移到液压成形设备。成形极限曲线（FLC）通常用作部件和工艺设计（包括有限元模拟）的辅助工具。本研究表明，如果要依靠该仪器进行零件和工艺设计，则必须通过液压成形来确定管材的FLC。
To select tube hydroforming instead of conventional fabrication, one has to know the tube material behaviour and tribological effects during hydroforming and how the hydroforming operation itself should be controlled. The hydroforming operation is either force- or stroke-controlled. This paper deals with stroke-controlled hydroforming. Hydroforming consists of free forming and calibration. In this paper, only the so-called free forming is treated. Stroke-controlled free forming is studied theoretically and experimentally. The theoretical part consists of analytical modeling and finite-element simulations. The conducted experiments are used to show the types of errors that might occur, when the theoretically obtained loading paths are transferred to the hydroforming equipment. The forming limit curve (FLC) is normally used as an aid/instrument in component and process design (which include finite-element simulations). The present study shows that the FLC of the tube material must be determined by hydroforming, if component and process design are to rely on this instrument.