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 language | English (US) |
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Pages (from-to) | 321-345 |
Number of pages | 25 |
Journal | International Journal of Mechanical Sciences |
Volume | 42 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2000 |
Externally published | Yes |
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Aerospace Engineering
- Ocean Engineering
- Applied Mathematics
- General Materials Science
- Civil and Structural Engineering