CIRP Encyclopedia of Production Engineering

2014 Edition
| Editors: The International Academy for Production Engineering, Luc Laperrière, Gunther Reinhart

Bar Extrusion

  • A. Erman TekkayaEmail author
  • Sami Chatti
Reference work entry



Pushing a billet enclosed in a container through a die to form an extrudate.

Theory and Application


Bar extrusion is a process in which a block of metal (billet) is forced to flow by compression through a tool (die) opening of a smaller cross-sectional area than that of the original billet. There are two basic types of bar extrusion: direct and indirect. The most important and common method used is the direct extrusion (Lange 1988). Figure 1 shows the principle of direct bar extrusion where the billet is placed in the container and pushed through the die by moving a ram towards the die (Saha 2000).
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Supplementary material

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Video. 3 (GIF 325 kb)


  1. Bauser M, Sauer G, Siegert K (2001) Strangpressen [Bar extrusion]. Aluminium Verlag, Dusseldorf (in German)Google Scholar
  2. Fritz AH, Schulze G (2008) Fertigungstechnik [Production engineering], 8th edn. Springer, Berlin (in German)CrossRefGoogle Scholar
  3. Lange K (1988) Umformtechnik, Bd. 2: Massivumformung [Metal forming, Vol. 2: bulk metal forming]. Springer, Berlin (in German)Google Scholar
  4. Ostermann F (2007) Anwendungstechnologie aluminium [Technological application of aluminum]. Springer, Berlin (in German)Google Scholar
  5. Saha PK (2000) Aluminum extrusion technology. ASM, USAGoogle Scholar
  6. Schikorra M, Donati L, Tomesani L, Kleiner M (2006) Role of friction in extrusion of 6060. In: AMPT-Conference 2006 Proceedings, Las Vegas, NevadaGoogle Scholar
  7. Sheppard T (1999) Extrusion of aluminium alloys. Kluwer, DordrechtCrossRefGoogle Scholar

Copyright information

© CIRP 2014

Authors and Affiliations

  1. 1.Institute of Forming Technology and Lightweight ConstructionTechnical University of DortmundDortmundGermany
  2. 2.Institut für Umformtechnik und LeichtbauTechnical University of DortmundDortmundGermany