Application of an upper bound method to off-centric extrusion of square sections, analysis and experiments

Kemal Celik, N. R. Chitkara

Research output: Contribution to journalArticle

Abstract

In the present study, previously developed analytical approach (Chitkara and Celik) which was based on the upper-bound theory, for the design of three dimensional off-centric extrusion of arbitrarily shaped dies was applied to the off-centric extrusion of square sections from initially round billets with experimental verifications. A computer program was written to obtain optimum die design which yield the lowest upper-bound for a given reduction in area, die length, off-centric positioning and frictional conditions. Computations were carried out both for the converging (ruled-surface) and smooth curved (advanced-surface) dies. Curvature of the extruded product and simulated deforming grid pattern were also predicted. A sophisticated CAD/CAM package was used in conjunction with the CNC and EDM processes to manufacture the streamlined dies for the off-centric extrusion of square section rods. The theoretical predictions were observed to be in good agreement with the experimental results.

Original languageEnglish (US)
Pages (from-to)321-345
Number of pages25
JournalInternational Journal of Mechanical Sciences
Volume42
Issue number2
DOIs
StatePublished - Jan 1 2000
Externally publishedYes

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Extrusion
Experiments
computer aided manufacturing
billets
Computer aided manufacturing
computer aided design
positioning
Computer program listings
Computer aided design
rods
grids
curvature
computer programs
products
predictions

ASJC Scopus subject areas

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

Cite this

Application of an upper bound method to off-centric extrusion of square sections, analysis and experiments. / Celik, Kemal; Chitkara, N. R.

In: International Journal of Mechanical Sciences, Vol. 42, No. 2, 01.01.2000, p. 321-345.

Research output: Contribution to journalArticle

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