Development of a novel bulk plastic deformation method: hydrostatic backward extrusion

Abstract

This paper aimed to propose a novel bulk plastic deformation method entitled hydrostatic backward extrusion process that is an implementation of the benefits of hydrostatic extrusion to the backward extrusion process. The applicability of the process was investigated using experimental tests and finite element analysis. The results showed that the produced tube by hydrostatic backward extrusion exhibits higher effective plastic strain while needing lower process load (elimination of friction force). The maximum process load in hydrostatic backward extrusion was obtained 55 kN that was 61.1 and 264.6 kN in the novel method of backward extrusion and conventional backward extrusion processes, respectively. This new method is promising for processing of high-strength ultrafine-grained tubes and hard-to-deform materials because of the nature of the processing by hydrostatic pressure.