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

    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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