A numerical sensitivity study to determine the main influence parameters on the back-end defect

Hatzenbichler, Thomas; Buchmayr, Bruno; Umgeher, Andreas

doi:10.1016/j.jmatprotec.2006.07.013

Cited by 21 publications

(21 citation statements)

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“…They proposed three die modification schemes and determined the optimal one. Hatzenbichler et al [24] performed a numerical sensitivity study with DEFORM-2D to determine the main influencing parameters on the length of the back-end defect during extrusion process. It was found that friction and geometric process parameters influenced significantly the back-end defect.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation on thermo-mechanical behavior during transient extrusion process of high-strength 7 × × × aluminum alloy profile

Yang

Wang

Zhao

et al. 2016

Int J Adv Manuf Technol

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Aluminum profile extrusion involves complex thermal, tribological, and mechanical interactions; thus, material flow and thermal behavior during extrusion process are very complicated. In this work, the material flow and thermal behavior of a 7 × × × aluminum alloy profile during an entire extrusion cycle are investigated numerically and experimentally. Hot compression tests are firstly carried out, and inverse analysis method is used to identify the material parameters of AA7N01 in Arrhenius constitutive model. The calculated global error is only 6.2 % between the predicted and experimental force-displacement curves, which verifies that the proposed model and obtained material parameters can describe well the rheological behavior of this alloy at elevated temperatures. Then a thermo-mechanical finite element model based on DEFROM-3D is built, and the transient extrusion process of the profile is simulated. By numerically analyzing the nose-end shape of the extruded profile, the evolution curves of exit temperature and of extrusion load, material flow and thermal behavior during extrusion process are investigated, respectively. Practical extrusion experiments verify the numerical model and results. Additional microstructure examination with electron backscatter diffraction (EBSD) technique also shows fine grains with the uniform grain size of about 9 μm on different locations of the extruded profile. Therefore, the material constitutive model and numerical model of extrusion process built in this work are capable enough to provide theoretical guidance in optimizing process parameters and designing extrusion dies.Keywords Thermo-mechanical behavior . Transient extrusion process . Arrhenius constitutive model . Inverse analysis method . High-strength 7 × × × aluminum alloy

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Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation on thermo-mechanical behavior during transient extrusion process of high-strength 7 × × × aluminum alloy profile

Yang

Wang

Zhao

et al. 2016

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…Accordingly, the quality of the extrudate becomes unacceptable and the extrudate must be discarded. This defect is known as the back-end defect [10,45].…”

Section: Billet Modelmentioning

confidence: 99%

Aluminium extrusion with a deformable die

Assaad¹

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“…In direct extrusion no lubrication is used, so that the outer layer of the billet is sheared off by friction with the container wall. This is beneficial, because this layer contains coarse iron-rich intermetallics and Mg 2 Si precipitations that are not suitable for extrusion [2]. These contaminations accumulate in the back of the billet at the end of the press stroke and are often referred to as the back end defect.…”

Section: Aluminium Extrusionmentioning

confidence: 99%

“…The mandrel has one or more cores (1) with bearings that shape the inner contour(s) of the profile. The cores are attached to the rest of the mandrel through legs (2). The aluminium flows around these legs through feeder holes (3) and rejoins in the welding chamber (4).…”

Section: Aluminium Extrusionmentioning

confidence: 99%

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CAD implementation of design rules for aluminium extrusion dies

Ouwerkerk¹

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A numerical sensitivity study to determine the main influence parameters on the back-end defect

Cited by 21 publications

References 14 publications

Numerical and experimental investigation on thermo-mechanical behavior during transient extrusion process of high-strength 7 × × × aluminum alloy profile

Numerical and experimental investigation on thermo-mechanical behavior during transient extrusion process of high-strength 7 × × × aluminum alloy profile

Aluminium extrusion with a deformable die

CAD implementation of design rules for aluminium extrusion dies

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