Influence of welding distortion of preform shell on shape variation during hydro-forming process of ellipsoidal shell

Zhang, W. W.; Shi, Yuan

doi:10.1007/s00170-017-0813-0

Cited by 5 publications

(8 citation statements)

References 9 publications

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“…The assumption has been successfully applied to hydrobulge 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]. The external surfaces of the perfect prolate ellipsoid and assumed ellipsoidal preform are mathematically described in Eq.…”

Section: Geometric Definition and Analytical Formulationmentioning

confidence: 99%

“…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. The performance of these hydrobulged shells has been widely explored using analytical, numerical, and experimental methods.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Geometric Definition and Analytical Formulationmentioning

confidence: 99%

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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show abstract

“…The needed ellipsoidal shell could easily be obtained by the structural design of the pre-form shell [45]. Meanwhile, the forming accuracy depended on the welding assembly process and subsequent hydroforming, the welding quality should ensure the enough plastic deformation of dihedral angle [46]. Experimental research was conducted on the ellipsoidal shells of double generating lines with an axis length ratio of 1.5, 1.7 and 2.2, as shown in figure 17.…”

Section: Novel Dieless Hydroforming Of Ellipsoidal Shells With Double...mentioning

confidence: 99%

Developments and perspectives on the precision forming processes for ultra-large size integrated components

Yuan

Fan

2019

Int. J. Extrem. Manuf.

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In order to meet the requirements of high reliability, long-lifetime and lightweight in a new generation of aerospace, aviation, high-speed train, and energy power equipment, integrated components are urgently needed to replace traditional multi-piece, welded components. The applications of integrated components involve in a series of large-size, complex-shaped, high-performance components made of difficult-to-deform materials, which present a huge challenge for forming ultra-large size integrated components. In this paper, the developments and perspectives of several extreme forming technologies are reviewed, including the sheet hydroforming of ultra-large curved components, dieless hydroforming of ellipsoidal shells, radial-axial ring rolling of rings, in situ manufacturing process of flanges, and local isothermal forging of titanium alloy components. The principle and processes for controlling deformation are briefly illustrated. The forming of typical ultra-large size integrated components and industrial applications are introduced, such as the high strength aluminum alloy, 3 m in diameter, integrated tank dome first formed by using a sheet blank with a thickness the same as the final component, and a 16 m diameter, integrated steel ring rolled by using a single billet. The trends for extreme forming of ultra-large size integrated components are discussed with a goal of providing ideas and fundamental guidance for the further development of new forming processes for extreme-size integrated components in the future.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Subsequently, Ruan guided his doctoral student Zhang to explore the effect of petal geometry and number on the hydrobulging of ellipsoidal shells from petal-shaped preforms. Double generating lines were used to design the petal-shaped preform to avoid insufficient hydrobulging at its two ends [29][30][31][32][33][34]. However, the resulting hydrobulged ellipsoidal shells were not compared with the perfect target geometry due to the poor fabrication accuracy of the method.…”

Section: Introductionmentioning

confidence: 99%

Integrated hydrobulging of prolate ellipsoids from preforms with multiple thicknesses

Zhang

Tang

Zhan

et al. 2023

Int J Adv Manuf Technol

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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.

show abstract

Influence of welding distortion of preform shell on shape variation during hydro-forming process of ellipsoidal shell

Cited by 5 publications

References 9 publications

Integrated hydrobulging of prolate ellipsoids from preforms with multiple thicknesses

Integrated hydrobulging of prolate ellipsoids from preforms with multiple thicknesses

Developments and perspectives on the precision forming processes for ultra-large size integrated components

Integrated hydrobulging of prolate ellipsoids from preforms with multiple thicknesses

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