Topic
Hydroforming
About: Hydroforming is a research topic. Over the lifetime, 2796 publications have been published within this topic receiving 26293 citations. The topic is also known as: Bulge forming.
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TL;DR: In this paper, hydraulic pressure was used to increase the depth-to-diameter ratio of a cup drawing, achieving a draw ratio of up to 3.5 by using a peripheral push to aid the draw force and hydraulic pressure tightly holding the wall of the cup against the punch.
27 citations
TL;DR: In this article, an automobile lower arm has been fabricated in a prototype form by hydroforming with the aids of numerical analysis and experiments, and the results obtained from numerical simulation for a lower arm in the hydroforming process are compared with a series of experiments.
Abstract: An automobile lower arm has been fabricated in a prototype form by hydroforming with the aids of numerical analysis and experiments. For the numerical process design, a program called HydroFORM-3D developed here on the basis of a rigid–plastic model, has been applied to the lower arm hydroforming. The friction calculation between die and workpiece has been dealt with carefully by introducing a new scheme in three-dimensional surface integration. To accomplish successful hydroforming process design, thorough investigation on the proper combination of process parameters such as internal hydraulic pressure, axial feeding and tool geometry has been performed. Results obtained from numerical simulation for a lower arm in the hydroforming process are compared with a series of experiments. The comparison shows that the numerical analysis successfully provides the manufacturing information on the lower arm hydroforming, and it predicts the geometrical deformation and the thinning.
27 citations
TL;DR: In this paper, a double-step hydroforming process is proposed for fabricating metallic bipolar plate of proton exchange membrane (PEM) fuel cells with thin slotted interdigitated serpentine pattern.
Abstract: Bipolar plate is considered as one of the main components of a fuel cell which has high weight and cost in the manufacturing of fuel cells. These plates are manufactured by different processes such as stamping, rubber pad forming, electromagnetic forming, and hydroforming, each of which has its own specific limitations. Among these processes, hydroforming is considered as a practical method in forming bipolar plates with complicated pattern due to its significant advantages. Bipolar plates have different flow field patterns including parallel, pin type, interdigitated, and serpentine patterns. Forming of slotted interdigitated serpentine flow field is very difficult due to its high geometrical complexity and accuracy of the flow pattern, small distance between slots, and very low thickness of sheet. To overcome this problem, a double-step hydroforming process is proposed in this work: an initial hydroforming step on a concave die and a final hydroforming step on a convex die. It is shown that the double-step hydroforming process is a feasible technique for fabricating metallic bipolar plate of proton exchange membrane (PEM) fuel cells with thin slotted interdigitated serpentine pattern.
27 citations
TL;DR: In this article, the effect of applying counter pressure on plastic instability of thin-walled tubes is analyzed and it is concluded that in dual-pressure tube hydroforming, the onset of plastic instability is delayed and the ductility of the metal is increased.
27 citations
TL;DR: In this paper, an impact hydroforming (IHF) is proposed, in which the sheet is formed with high-pressure pulse combining hydroforming and high strain rate (HSR) forming, an IHF bulge test setup was designed, 5A06 aluminium sheet was tested with strain rate of 2.5 × 104 s−1 showing remarkable thickness strain increase compared with quasi-static condition.
27 citations