Abstract
The upper bound approach is utilized to analyze the forward extrusion of metals through a rotating conical die. A continuous spherical velocity field, compounded with a torsional velocity field constrained in a conical channel, is assumed. The circumferential slippage between the material and the tooling is analyzed by carrying out a minimization procedure on the expression derived for extrusion pressure. The length of material twisting inside the container is evaluated both using a slab method and an approach based on the balance of moments. This enables a complete upper bound estimate of extrusion pressure to be obtained. The reasonably simple model thus produced enables an analytical solution to be generated that agrees well with the experimental results.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
