Hydroforming - a method to manufacture light-weight parts

Dohmann, F.; Hartl, C.

doi:10.1016/0924-0136(96)02403-x

Cited by 208 publications

(108 citation statements)

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“…The new process of tube hydroforming (THF) has gradually come into use over the last half decade for manufacturing aircraft and automobile components [1,2]. Using the THF process, manufactures are able to produce parts of complex shape which are lighter and have fewer welds than those using alternative metal forming techniques.…”

Section: Introductionmentioning

confidence: 99%

Die shape design for T-shape tube hydroforming

Kwan

Lin

Luo

et al. 2004

The International Journal of Advanced Manufacturing Technology

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In this paper, two design methods for T-shape tube hydroforming dies are proposed, namely, the extrusion-cutting-fillet method (ECFM) and the intersection-fillet method (IFM). Simulations on hydraulic expansion and axial feeding of T-shape tube hydroforming with two dies using the program DEFORM-3D were performed. The influence of the two dies on workpiece formability of T-shape tube hydroforming was examined. Experiments were carried out with SUS304 stainless steel tube at room temperature. A qualified product of T-shape tube, without wrinkling or bursting, was obtained using the die designed by the IFM method.

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Section: Introductionmentioning

confidence: 99%

Die shape design for T-shape tube hydroforming

Kwan

Lin

Luo

et al. 2004

The International Journal of Advanced Manufacturing Technology

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“…bursting, localized wrinkling and global buckling, may take place on the tubes. Either wrinkling or buckling of tubes can be caused by excessive axial compressive stress due to axial feeding [1,2]. Wrinkle was always considered as one of the defects of tubes in the past investigations, which must be avoided as far as possible [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Wrinkling behavior in tube hydroforming coupled with internal and external pressure

Cui

Wang

Yuan

2015

MATEC Web of Conferences

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Abstract. Control and use of wrinkles is a challenge in tube hydroforming because wrinkle was always considered as one of the defects of tubes from the traditional view. In this paper, a dedicated experimental setup was designed and manufactured, using which the investigation of wrinkling behavior coupled with internal and external pressure can be realized. The effect of internal or external pressure on 5A02 aluminum alloy tubes and 0Cr18Ni9 stainless steel tubes were all investigated using this setup. It was found that the number and shape of wrinkles are strongly dependent on the internal or external pressure. More important is that the geometrical configuration of wrinkles can be perfectly characterized using the Gauss function rather than the sine function adopted in the published literature. In addition, the fitted Gauss functions for every wrinkle were integrated in order to compare their area with the corresponding area of die cavity, so as to obtain the appropriate process parameters for the useful wrinkle, which can be formed in advance and then flatted in the calibration stage.

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“…One forming technology used to form lightweight structural component is tube hydroforming where an internal pressure is applied to force the tube to expand into the required shape among a closed die cavity -much like blowing up a balloon [2]. In such forming process, the internal pressure is the only driving force for the plastic deformation, and needs to reach hundreds of MPa.…”

Section: Introductionmentioning

confidence: 99%

Effect of internal pressure on springback during low pressure tube hydroforming

2018

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For the existence of bending deformation during low pressure tube hydroforming(LPTH), springback is unavoidable and deteriorate the forming accuracy. In this paper, an analytical model of springback for LPTH was proposed. The simulation and experiment were carried out to investigate the effects of the main factors on the springback, such as internal pressure, corner radius and thickness. The results indicate that, different from expansion deformation, bending forming is the main and basic deformation for tube forced into the required shape during the LPTH. Consequently, springback appears. However, the deformation type has great dependence on the internal pressure, which ensures the internal pressure of the function to reduce the springback. There is a critical pressure which would induce pure bending deformation and result in the largest springback. Consequently, it need try to avoid the critical pressure for the LPTH. On the contrary, whatever the internal pressure is less or bigger than the critical pressure, springback are all decreased. In contrast, it is more effective to decrease the springback when pressure is bigger than the critical pressure. In addition, bigger corner radius can also contribute to decrease the springback because of a much larger tensile force introduced under the same internal pressure. For a definite component, improving internal pressure is the only method to decrease the springback.

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Hydroforming - a method to manufacture light-weight parts

Cited by 208 publications

References 0 publications

Die shape design for T-shape tube hydroforming

Die shape design for T-shape tube hydroforming

Wrinkling behavior in tube hydroforming coupled with internal and external pressure

Effect of internal pressure on springback during low pressure tube hydroforming

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