Generalised CAD/CAM solution to the three-dimensional off-centric extrusion of shaped sections: analysis

N. R. Chitkara, Kemal Celik

Research output: Contribution to journalArticle

Abstract

An analytical method based on the upper-bound theory is proposed to investigate the three-dimensional off-centric extrusion of arbitrarily shaped sections from arbitrarily shaped billets through linearly converging and smooth curved dies. A set of generalised kinematically admissible velocity fields are derived on the assumption of Bezier-type streamlines that provide compatibility of surface representation with most CAD/CAM systems. To obtain a more realistic non-uniform metal flow, a special velocity function was also incorporated into the derived velocity fields and work hardening effect of the material considered. Based on the method presented, for a given reduction in area, material property, friction condition and off-centric positioning of the exit cross-section, predictions of the deforming grid pattern, curvature of the extruded product as well as upper-bound to the extrusion pressures may be obtained. The above procedure is highlighted and commented upon.

Original languageEnglish (US)
Pages (from-to)273-294
Number of pages22
JournalInternational Journal of Mechanical Sciences
Volume42
Issue number2
DOIs
StatePublished - Jan 1 2000
Externally publishedYes

Fingerprint

computer aided manufacturing
Computer aided manufacturing
computer aided design
Extrusion
Computer aided design
velocity distribution
billets
work hardening
hardening
compatibility
positioning
friction
grids
curvature
Strain hardening
Materials properties
cross sections
Computer systems
products
predictions

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Generalised CAD/CAM solution to the three-dimensional off-centric extrusion of shaped sections : analysis. / Chitkara, N. R.; Celik, Kemal.

In: International Journal of Mechanical Sciences, Vol. 42, No. 2, 01.01.2000, p. 273-294.

Research output: Contribution to journalArticle

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