Improving formability due to an enhancement of sealing limits caused by using a smart fluid as active fluid medium for hydroforming

Rösel, Sebastian; Merklein, Marion

doi:10.1007/s11740-013-0496-9

Cited by 28 publications

(9 citation statements)

References 5 publications

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“…air, nitrogen, argon). Smart fluids show promise but are in the early stages of development and carry a host of technical challenges and understanding required [116] and ceramic beads are not technically a fluid so hydrostatic pressure is not guaranteed and forces are transmitted through Bforce chains^ [117]. In addition, the medium can have wear issues as ceramic beads break down after use.…”

Section: Warm Hydroformingmentioning

confidence: 99%

A state of the art review of hydroforming technology

et al. 2019

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Hydroforming is a relatively new metal forming process with many advantages over traditional cold forming processes including the ability to create more complicated components with fewer operations. For certain geometries, hydroforming technology permits the creation of parts that are lighter weight, have stiffer properties, are cheaper to produce and can be manufactured from fewer blanks which produces less material waste. This paper provides a detailed survey of the hydroforming literature of both established and emerging processes in a single taxonomy. Recently reported innovations in hydroforming processes (which are incorporated in the taxonomy) are also detailed and classified in terms of “technology readiness level”. The paper concludes with a discussion on the future of hydroforming including the current state of the art techniques, the research directions, and the process advantages to make predictions about emerging hydroforming technologies.

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Section: Warm Hydroformingmentioning

confidence: 99%

A state of the art review of hydroforming technology

et al. 2019

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“…Ruez & Knoll published a work on a new hybrid process for tube hydroforming and injection molding which can be used in automotive applications. Other works included Liu et al who looked at implementing a pre-bulging stage during a hydroforming process to increase formability [23], Bach et al looked at impulsive forming of tubes through gas detonation [24], Rösel & Merklein and later Wang et al looked into using smart fluid in a hydroforming operation which could change viscosity by using electromagnetism [25,26]. While all of these areas of research are actively advancing hydroforming technology, none of them mention the generation of the flange radius and are therefore outside the scope of this work.…”

Section: Literature Surveymentioning

confidence: 99%

Enabling sheet hydroforming to produce smaller radii on aerospace nickel alloys

Bell

Dixon²,

Blood³

et al. 2018

Int J Mater Form

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This paper presents the first academic study of a hydroforming process known as edging. An edging process allows a smaller radius to be produced with a lower pressure than a standard sheet hydroforming process and is currently developed by trial and error that relies heavily on operator experience. This paper reports the first systematic investigation of the edging process that concludes in a new analytical model which can be used to enable the design of edging processes. It was found that in each of the three aerospace nickel alloys tested, the edging technique was effective in sharpening the flange radius from 10 mm to 4 mm or from 6 mm to 2 mm in thicknesses of 2.1 mm and 1.2 mm respectively. This radius is equivalent to between 1.5 and 1.8 times the material thickness (1.5 t to 1.8 t). These results were achieved by using edging heights of between 2.5 to 5 mm (2.5 t to 3 t). At the limits of successful edging operations, (under 2 t) three different kinds of phenomena were observed: crushing of the top of the component, radii which were pushed inwards, and the generation of an underside lip which protruded from the bottom of the samples. This paper discusses the benefits of hydroforming with an edging operation, explores the limitations of the edging process, derives an equation which can be used to estimate the sharpness of an edged radius and finally defines a model which enables the design of an edging operation. The work reported here is particularly relevant to aerospace applications because it will enable lighter components to be formed with lower pressures with nickel based superalloys.

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“…Another application of ferrofluids is found in loudspeaker systems, where they serve as cooling and damping medium [210,211]. In addition, ferrofluids are used in sealing systems, where they form a dynamic liquid sealing [212,213].…”

Section: Ferrofluidsmentioning

confidence: 99%

Nanofluids revisited

Eggers

Kabelac

2016

Applied Thermal Engineering

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h i g h l i g h t s Thermophysical properties bring nanofluids into various engineering applications. Quantity of variable parameters hinder comprehensive equations, e.g. for viscosity. Coordinated research can help to overcome debates about thermophysical properties. Missing experience for nanofluids in large scale plants. Lack of studies about high pressure/temperature applications and long term behavior. a b s t r a c tIn the roughly two decades from the first publication until today, nanofluids have found their way into various research fields. To-date published documents range from basic research to high-tech applications. This contribution aims at outlining current fields of research regarding nanofluid research. These range from fundamental property data studies presented in the first section to a listing of numerous applications of different fields of engineering. It is shown that nanofluid science pushes increasingly into the scientific world providing plenty of new questions and challenges.

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Improving formability due to an enhancement of sealing limits caused by using a smart fluid as active fluid medium for hydroforming

Cited by 28 publications

References 5 publications

A state of the art review of hydroforming technology

A state of the art review of hydroforming technology

Enabling sheet hydroforming to produce smaller radii on aerospace nickel alloys

Nanofluids revisited

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