Pre-bulging influence on an inverse drawn shape obtained with Hydromechanical Deep Drawing (HDD)

Papadia, Gabriele; Prete, Antonio Del; Spagnolo, A.; Anglani, A.

doi:10.1007/s12289-010-0763-7

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…When the pre-bulging is used, the unsupported portion of the blank between the punch and the blank-holder is pressurized to bulge in the direction opposite to the punch displacement. The deformation is added in every zones, especially in the un-deformed zones of traditional sheet hydroforming, thus the strain hardening and thickness uniformity are increased [25,26], as shown in figure 9. The corresponding enhancement degree is decided by the optimized pre-bulging and hydroforming parameters like pre-bulging height, shape, location and fluid pressure, etc.…”

Section: Key Technologies For Controlling Wrinkling and Rapturementioning

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.

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Section: Key Technologies For Controlling Wrinkling and Rapturementioning

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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“…First, since matching dies are not needed, the irregularly contoured products are easily formed and this results in a diminished tooling cost [5]. In addition to this, it provides high surface finish and produces the formed sheet with a high precision [6], [7]. The outer surface quality of a part formed by hydromechanical deep drawing is thus better than in conventional deep drawing [8].…”

Section: Introductionmentioning

confidence: 99%

Punch Radius Influence on “Large Size” Hydroformed Components

Papadia

Prete

Spagnolo

2012

KEM

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Sheet metal hydroforming has gained increasing interest during last years, especially as application in the manufacturing of some components for: automotive, aerospace and electrical appliances for niche productions. Different studies have been also done to determine the optimal forming parameters making an extensive use of FEA. In the hydroforming process a blank sheet metal is formed through the action of a fluid and a punch. It forces the sheet into a die, which contains a compressed fluid. Many studies have been focused on the analysis of process and geometric parameters influence about the hydroforming process of a single product with main dimensions till to 100 mm. In this paper the authors describe the results of an experimental activity developed on two different large sized products obtained through sheet metal hydroforming. Different geometric and process parameters have been taken into account during the testing phase to study, in particular, the punch radius influence on the process feasibility. An ANOVA analysis has been implemented to study the influence of geometrical and process parameters on the maximum hydroforming depth. Through this work it has been possible to verify that in the hydroforming process of large size products geometry and, in particular, punch radius, are some of the main factors that influences the feasibility of the products. Different considerations can be made about the effects of the blankholder force and the fluid pressure on the maximum hydroforming depth. As further developments, the authors would perform a numerical study in order to enlarge the knowledge of the process design space to other possible values of the punch radius.

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An innovative approach for detection of surface quality based on specific work environment using experiments, aerodynamic simulation, and theoretical analysis

Zhang

Lang

Liu

et al. 2017

Int J Adv Manuf Technol

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Pre-bulging influence on an inverse drawn shape obtained with Hydromechanical Deep Drawing (HDD)

Cited by 5 publications

References 5 publications

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

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

Punch Radius Influence on “Large Size” Hydroformed Components

An innovative approach for detection of surface quality based on specific work environment using experiments, aerodynamic simulation, and theoretical analysis

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