Axi-symmetric forward spiral extrusion, a kinematic and experimental study

▶ The accumulated strain in AFSE, a new extrusion process, is the result of circumferential velocity gradient along extrusion axis. ▶ The effective strain depends on the radius and helix angle only while independent of the chamfer geometry. ▶ Embedded wires were used to verify the validity of the derived velocity field during AFSE. ▶ The velocity field and the observations conform well and the proposed kinematics is a reliable model for AFSE.