AN UPPER-BOUND ANALYSIS OF THE BACKWARD EXTRUSION OF TUBES OF COMPLICATED INTERNAL SHAPES FROM ROUND BILLETS

A new kinematically-admissible velocity field is proposed to determine the final-stage extrusion load and the average extruded height in the backward extrusion of internally non-axisymmetric tubes from round billets. The proposed velocity field is applied to the backward extrusion of internally trochoidal gear-shaped tubes and rounded rectangular-shaped tubes, the profile function of a rounded rectangle being approximated by using a Fourier series. Experiments are carried out with fully-annealed commercial aluminum-alloy billets at room temperature using various shaped punches. The theoretical predictions of the extrusion load are in good agreement with the experimental results and there is generally reasonable agreement in average extruded height between theory and experiment.
Publisher
ELSEVIER SCIENCE SA LAUSANNE
Issue Date
1993-01
Language
ENG
Citation

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, v.36, no.2, pp.157 - 173

ISSN
0924-0136
URI
http://hdl.handle.net/10203/2615
Appears in Collection
ME-Journal Papers(저널논문)
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