An upper bound analysis of tube extrusion process through rotating conical dies

Abstract

In this paper, an upper bound approach is used to analyse the tube extrusion process through steadily rotating conical dies. The material under deformation in the die and inside the container is divided into four deformation zones. In each deformation zone, a kinematically admissible velocity field is developed to evaluate the internal power, the power dissipated on frictional and velocity discontinuity surfaces and the twist moments generate on frictional surfaces. By equating the total power with the required external power, the extrusion pressure is determined. The tube extrusion process through rotating die is also simulated by using the finite element code, ABAQUS. Analytical results are compared with the results given by the finite element method. These comparisons show a good agreement.

Keywords:

• Tube extrusion
• rotating conical die
• upper bound method
• FEM

Additional information

Notes on contributors

H Haghighat

Heshmatollah Haghighat received his BSc in mechanical engineering from Isfahan University of Technology, Iran, in 1990. He received his MSc and PhD in mechanical engineering from Tarbiat Modares University, Tehran, Iran, in 1993 and 1999, respectively. He is currently an associate professor in the mechanical engineering department at Razi University, Kermanshah, Iran. He has published over 20 conference papers and 12 journal publications (in Farsi and English languages) related to extrusion process analysis and simulation.

M Moradmand

M Moradmand received his BSc in Mechanical Engineering from Islamic Azad University, Sari branch, in 2009. He received his MSc in Mechanical Engineering from Razi University, Kermanshah, Iran, in 2012.