Hydromechanisches Tiefziehen und Hochdruckblechumformung als Verfahren zur Herstellung komplexer Bauteile aus Magnesiumfeinblechen des Typs AZ31B‐0

Viehweger, Bernd; Richter, G.; Düring, Michael; Karabet, Andrey; Sviridov, Alexander�; Hartmann, Horst; Richter, U.

doi:10.1002/mawe.200400763

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…There is only one slip system with three independent sliding directions at room temperature at this type of lattice. Hereby a cross slip of dislocations is not possible with the result that magnesium alloys have a relatively brittle material behavior at low forming temperatures [12,13,14,15,16,17]. Above 225°C further slip planes are activated in the first pyramid plane which means that a sudden increase in deformation is recorded [18].…”

Section: Pulsed Magnetic Forming Of Magnesium Alloy Az31mentioning

confidence: 99%

Potentials of Pulse Magnetic Forming and Joining

Uhlmann

Prasol

Ziefle

2014

AMR

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Magnetic pulse production methods such as forming, joining or separating demonstrate innovative high-speed processes. Such processes can be realized using a capacitor and an appropriate tool coil for forming and welding processes. The process strain rates, which can amount to 20,000 s-1, increase the formability of metallic materials significantly. Magnesium and aluminium alloys find a wider application in the automotive industry due to their light weight potential. Through the low density of these materials, the vehicle weight can be reduced considerably. Due to the hexagonal lattice of magnesium alloys industry-relevant deformation in metal forming processes can only be achieved in hot forming processes. The high-speed forming allows a significant increase of deformability of this alloy. The use of dissimilar metals in an assembly requires the development of innovative joining methods. Apart from being used form and force closure the magnetic pulse welding and adhesive bonding material with different partners is possible. Currently at the Institute for Machine Tools and Factory Management (IWF), TU Berlin, various research topics in the field of pulsed magnetic are investigated. The magnetic pulse sheet metal forming of magnesium alloys at room temperature is investigated in a basic research project. A defined demarcation of high-speed forming with respect to the quasi-static deformation is done by means of hardness measurements in the deformation zone. For this purpose a suitable experimental setup with different matrices is constructed. The experimental results of the pulse magnetic deformation are iteratively compared with simulation results. The aim is to develop a new material model which gives a precise prediction about the high-speed process. In the field of magnetic pulse welding, both basic research and industry-related research projects conducted at the IWF. The process requires an adapted tool coil geometry that meets the requirements of the weld geometry. Different coil geometries and weld geometries and possible applications are presented by way of example, the welding quality is quantified by means of different analytical methods. The material microstructure in the weld zone, characterized by light and scanning electron microscopy shows the typical features of a shock welded joint, as also observed in explosive welding.

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Section: Pulsed Magnetic Forming Of Magnesium Alloy Az31mentioning

confidence: 99%

Potentials of Pulse Magnetic Forming and Joining

Uhlmann

Prasol

Ziefle

2014

AMR

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“…[1][2][3] These three features not only increase the limiting drawing ratio but also offer many other advantages, such as a reduction in tooling costs and improvement in dimensional accuracy. SHF is also applied to low-formability materials, such as aluminum 4) and magnesium, 5) as well as conventional steels. Nowadays, SHF is widely employed in various industries, including the automobile, aerospace, consumer electronics, and kitchen industries.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Sheet Deformation and Hydraulic Pressure Variation during Sheet Hydroforming

et al. 2009

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In our series of studies, the outflow characteristics of a pressure medium used for a sheet hydroforming process have been investigated. The variation of hydraulic pressure during a square-cup sheet hydroforming process was examined, focusing on correlation with sheet deformation. In the initial stage, the outflow of the pressure medium remained stable because a greater extent of pre-bulging arose around the die shoulder just after the process commenced. When the pre-bulging ceased, the pressure medium was sealed in the chamber. Thus, the hydraulic pressure began to increase rapidly within the chamber, and fell in the flange area. The punch stroke at which the hydraulic pressure in the chamber began to rise was highly dependent on the blank holding force because the height of pre-bulging was determined by this force. When the sheet conformed completely to the die shoulder, the pressure medium was also sealed at the shoulder. Therefore, the hydraulic pressure on the die shoulder as well as in the flange area started to fall. The correlation between the critical punch stroke for fracture and the hydraulic pressure in the flange area was also examined.

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