Progress in large vessel forming: introduction of some innovations of Prof. Z.R. Wang

Shi, Yuan; Teng, Bugang; Dong, Xin; Wang, R.W.

doi:10.1016/j.jmatprotec.2004.04.390

Cited by 21 publications

(13 citation statements)

References 4 publications

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“…Moreover, this process is only suitable to fabricate small size reservoirs. Because of no need of dies and presses, the internal hydro-bulging process (IHBP) possess following advantages compared with the traditional fabricating process for the closed shell (Yuan et al, 2004): (1) a lower cost, (2) a shorter production cycle, (3) less residual stress and easier fabrication and welding, (4) small springback after unloading. Therefore, the internal hydro-bulging process is very suitable to fabricate middle or large spherical shells.…”

Section: Introductionmentioning

confidence: 99%

Shape improvement of a dieless hydro-bulged sphere made of hexagonal and pentagonal shaped panels

Zhang

Wang

2015

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 99%

Shape improvement of a dieless hydro-bulged sphere made of hexagonal and pentagonal shaped panels

Zhang

Wang

2015

Journal of Materials Processing Technology

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“…Integral hydrobulging is a method of fabricating large shells of revolution that is effective, flexible, and inexpensive compared with traditional die forming [11][12][13][14]. Large shells of revolution, such as spheres [15][16][17][18][19][20][21][22], toroids [23][24][25][26][27][28], ellipsoids [29][30][31][32][33][34], and eggs [35][36][37], can be directly hydrobulged from polyhedral preforms without the use of dies.…”

Section: Introductionmentioning

confidence: 99%

Integrated hydrobulging of prolate ellipsoids from preforms with multiple thicknesses

Zhang¹,

Tang²,

Zhan³

et al. 2022

Preprint

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The integrated hydrobulging of stainless-steel prolate ellipsoids from preforms with two thicknesses was investigated. The produced ellipsoids were closed with two 16-mm-thick closures and had nominal semiminor and semimajor axes of 89 and 125 mm, respectively. The ellipsoidal preforms comprised eight conical segments inscribed inside the target perfect ellipsoid. The four end and middle segments of the preforms had nominal thicknesses of 0.67 and 0.83 mm, respectively. The hydrobulging of these preforms was explored analytically and numerically and was compared with that of prolate ellipsoids with constant thickness. Two nominally identical ellipsoidal preforms were fabricated, measured, and hydrobulged to confirm the theoretical predictions. The results indicated that varying the preform thicknesses is an efficient method of overcoming insufficient hydrobulging of the ends of prolate ellipsoids in other methods. Moreover, hydrobulging instability can be effectively monitored by measuring geometric dimensions, such as axial height.

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“…Few studies on making large spherical vessels by fluid pressurization without the use of dies have been reported. [5][6][7] Recently, studies on the use of die-less hydroforming process for tube joining have been reported. 8,9 The major goal of this study is therefore to explore potential geometries that are ideal for die-less hydroforming process.…”

Section: Introductionmentioning

confidence: 99%

Die-less hydroforming of multi-lobe tubular structures

Hummel

Ngaile

2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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The process capability of die-less hydroforming for producing tubular structures of complex geometries was investigated. Multi-lobe tubular structures were chosen for this study as they are capable of carrying higher loads than normal tubes of the same weight. The forming characteristics of three variants of tubular geometry with longitudinal lobes, circumferential lobes, and helical lobes were studied through numerical analysis. The parameters that were investigated were tube wall thickness, tube diameter, tube length-to-diameter ratio, pressure loading paths, and lobe-forming patterns. The finite element analysis showed that the length of the tube does not influence the lobe formation for all three tube variants. The finite element analysis results also demonstrated that lobe wall thinning varies linearly with hydroforming pressure for all multi-lobe tube patterns studied. The strength-to-weight benefit of the tubular structures was also verified through finite element analysis for annealed stainless steel tube sample of 200 mm length, 40 mm diameter, and 2 mm wall thickness. The longitudinal lobed geometry, circumferential lobed geometry, and the helical lobed geometry all were able to carry significantly larger loads as compared to a blank tube of the same mass under compressive, flexural, and torsional loading conditions. To test the viability of the die-less hydroforming process, a longitudinal lobed tubular structure was fabricated and formed. The results from this study indicate that a die-less hydroforming manufacturing process is viable and capable of producing strong, lightweight parts of complex geometries. Besides being capable of producing complex tubular structures, the costs associated with die-less hydroforming are significantly lower due to the absence of a press and dies. However, preparation of tubular blanks requires reliable weld seams and rolling operations.

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Progress in large vessel forming: introduction of some innovations of Prof. Z.R. Wang

Cited by 21 publications

References 4 publications

Shape improvement of a dieless hydro-bulged sphere made of hexagonal and pentagonal shaped panels

Shape improvement of a dieless hydro-bulged sphere made of hexagonal and pentagonal shaped panels

Integrated hydrobulging of prolate ellipsoids from preforms with multiple thicknesses

Die-less hydroforming of multi-lobe tubular structures

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