Non-conventional cold extrusion

Abstract

In recent years new extrusion processes have been developed for non axisymmetric shapes and with a variety of tool geometry, among them radial extrusion, rotary forming, non-axisymmetric extrusion etc. In this paper two “non-conventional” cold extrusion processes are investigated; radial extrusion using a circular punch and backward extrusion with the punch of square cross section. Experiments have been conducted in order to determine the basic process parameters. Furthermore, an Upper Bound solution for load prediction in radial extrusion have been developed which shows relatively good agreement with the experiment.