Blank Hydroforming Using Granular Material as Medium-investigations on Leakage

Grüner, Martin; Gnibl, Tobias; Merklein, Marion

doi:10.1016/j.proeng.2014.10.137

Cited by 12 publications

(4 citation statements)

References 1 publication

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“…Warm hydroforming can still use fluids in temperatures a few hundred degrees above ambient conditions while suffering moderately more damage to wear pads. However, for temperatures over 350°C, fluids are generally not acceptable [29] and using hot gas or an alternate media (e.g. ceramic beads) is required.…”

Section: Process Parametersmentioning

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: Process Parametersmentioning

confidence: 99%

A state of the art review of hydroforming technology

et al. 2019

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“…From the results, it was concluded that the sealing limit can be enhanced by lower flange contact pressure and higher cavity pressure. In terms of solid medium, Grüner et al [ 22 ] evaluated the use of granular material (small ceramic spheres) in the hydroforming of CP800 steel and MS1200 steel sheets and focused on the leakage issue at elevated temperatures. They could enhance sheet formability by proper sealing of the die set at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

On Improving Sheet Metal Formability in Hydrodynamic Deep Drawing Process through a Solid‐Oil‐Type Mineral Grease Pressure Medium

Modanloo,

Akhoundi,

Lee

et al. 2023

steel research int.

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In this research, the improvement in sheet metal formability obtained through the utilization of a mineral grease in solid oil type (SMG) pressure medium in the hydrodynamic deep drawing process assisted by radial pressure (HDDRP) was investigated by experiments and finite element method (FEM) simulations on flat‐bottom cups realized with pure copper and DIN 1.0338 steel. To determine the process parameters ranges, a FEM model was developed in ABAQUS/Explicit and validated against experimental results. Afterward, experiments were carried out using two pressure mediums with different viscosities, id est water, and SMG. Considering the results relevant for both sheet materials, the SMG medium allowed an average reduction of the sheet metal thinning of 15% and 10% on the corner edges while also granting a negligible thickness variation on the cup walls. On the other hand, the higher viscosity of the SMG, in comparison to the water medium, also resulted in an average 16% increase in the forming force when compared to the water pressure medium.This article is protected by copyright. All rights reserved.

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“…The process is well established [5] and usually carried out by the room temperature and widely used for ductile alloys, such as carbon steel and aluminum alloys [6], as well as stainless steel [7]. Hydroforming by the elevated temperature is also possible [8], but the temperature for fluids is still limited to the range below 350 °C [9] and using hot gas or an alternate media is required [10].…”

Section: Introductionmentioning

confidence: 99%

Upset bulging as a preforming operation for hot metal gas forming of 22MnB5 tubes

Alimov

Haase

Sviridov

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Hot Metal Gas Forming (HMGF) is a coupled process of gas forming and quenching of tubes. This process allows to obtain complex and accurate geometry due to the elimination of springback and high mechanical properties due to the formation of martensite, as a result, the weight of the parts can be reduced. HMGF is widely used in the aerospace and automotive industries to make critical parts from high hardenability steels such as 22MnB5. A typical hot stamped component has 1000 MPa yield stress and 1500 MPa ultimate tensile strength. The main challenge of HMGF process is a significant material thinning and cracking due to the biaxial tension stress state. The paper proposes a preforming method for increasing the forming limits of HMGF by the cold upset bulging of tubes by means of the additional volume of material in the deformation zone. This method allows to obtain one or several waves in the cross section of the tube, which helps to increase the minimum workpiece wall thickness after the forming process by more than 40% and to reduce a probability of the crack formation.

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Blank Hydroforming Using Granular Material as Medium-investigations on Leakage

Cited by 12 publications

References 1 publication

A state of the art review of hydroforming technology

A state of the art review of hydroforming technology

On Improving Sheet Metal Formability in Hydrodynamic Deep Drawing Process through a Solid‐Oil‐Type Mineral Grease Pressure Medium

Upset bulging as a preforming operation for hot metal gas forming of 22MnB5 tubes

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