Bridge design influences on the pressure conditions in the welding chamber for porthole die extrusion
Publikation: Beiträge in Sammelwerken › Aufsätze in Konferenzbänden › Forschung › begutachtet
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Metal Forming 2014. Hrsg. / Fabrizio Micari; Livan Fratini. Band 622-623 Trans Tech Publications, 2014. S. 87-94 (Key Engineering Materials; Band 622-623).
Publikation: Beiträge in Sammelwerken › Aufsätze in Konferenzbänden › Forschung › begutachtet
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TY - CHAP
T1 - Bridge design influences on the pressure conditions in the welding chamber for porthole die extrusion
AU - Gagliardi, Francesco
AU - Schwane, Martin
AU - Citrea, Teresa
AU - Haase, Matthias
AU - Ben Khalifa, Noomane
AU - Tekkaya, A. Erman
N1 - Conference code: 15
PY - 2014
Y1 - 2014
N2 - Porthole die extrusion of lightweight alloys is used for the production of profiles, which may have complex cross section geometries. The mechanical properties of these profiles are deeply affected by the seam welds, which are generated in hollow profiles along the whole length. The seam welds result from the rejoining of the material streams in the welding chamber of the porthole die. The joining phase and hence the seam weld quality are strongly influenced by the temperature and the pressure conditions in the welding chamber. Those process conditions can be adjusted by a proper die design. In this work, the focus lies on the feeder section of the extrusion die, which consists of a set of bridges, whose shapes influence the material entry in the welding chamber. A numerical study was carried out to investigate different bridge shapes with regard to the pressure inside the welding chamber and the punch load. Subsequently, the volume of the bridge was fixed to isolate and better investigate the influence of the shape. It was observed that bridge designs leading to higher flow distortion cause higher pressure decrement along the welding plane and, consequently, degradation of the welding conditions.
AB - Porthole die extrusion of lightweight alloys is used for the production of profiles, which may have complex cross section geometries. The mechanical properties of these profiles are deeply affected by the seam welds, which are generated in hollow profiles along the whole length. The seam welds result from the rejoining of the material streams in the welding chamber of the porthole die. The joining phase and hence the seam weld quality are strongly influenced by the temperature and the pressure conditions in the welding chamber. Those process conditions can be adjusted by a proper die design. In this work, the focus lies on the feeder section of the extrusion die, which consists of a set of bridges, whose shapes influence the material entry in the welding chamber. A numerical study was carried out to investigate different bridge shapes with regard to the pressure inside the welding chamber and the punch load. Subsequently, the volume of the bridge was fixed to isolate and better investigate the influence of the shape. It was observed that bridge designs leading to higher flow distortion cause higher pressure decrement along the welding plane and, consequently, degradation of the welding conditions.
KW - Contact pressure
KW - Extrusion
KW - FEM
KW - Porthole
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=84923113150&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/KEM.622-623.87
DO - 10.4028/www.scientific.net/KEM.622-623.87
M3 - Article in conference proceedings
AN - SCOPUS:84923113150
SN - 978-3-03835-193-1
VL - 622-623
T3 - Key Engineering Materials
SP - 87
EP - 94
BT - Metal Forming 2014
A2 - Micari, Fabrizio
A2 - Fratini, Livan
PB - Trans Tech Publications
T2 - 15th International Conference on Metal Forming 2014
Y2 - 21 September 2014 through 24 September 2014
ER -