Planar Twist Extrusion versus Twist Extrusion

Abstract

Modification of Basic Twist Extrusion (BTE) process with a matrix having two parallel movable walls, Planar Twist Extrusion (PTE), was considered in the present study. The accumulated strain achieved after one PTE pass and the character of its distribution in the sample cross-section were studied by means of experimental modelling and confirmed by finite element analysis. The differences in the magnitude and distribution of the accumulated strain after BTE and PTE were established. Both processes permitted homogenization of the mechanical properties of the sample. Substantial reduction in the pressure required for extrusion of long samples can be achieved by using the PTE matrix.