Geometry factors and inhomogeneity of flow in rotary piercing and cold drawing of seamless tubing

Abstract

An assessment of the levels of inhomogeneous or redundant flow, as reflected by the redundancy factors, in the basic rotary-piercing and cold tube drawing processes, is made by means of derived geometry factors. The validity of the approach is tested against the experimental data. A generally satisfactory measure of agreement which exists between the proposed factors and the experimentally established inhomogeneity of the deformation, particularly in drawing, indicates the possibility of utilising this simple method in the computation of stress and strain levels in the tube making processes.