Inward Flow of Surface Materials at Back-Ends of Billets During Al-Extrusion, Part 2: Influence of Process Parameters

[+] Author and Article Information
Jin Hou, Ulf Ståhlberg

Materials Forming, Department of Materials Processing, Royal Institute of Technology, 100 44 Stockholm, Sweden

Bo Bengtsson

Gränges Technology, 612 81 Finspång, Sweden

J. Manuf. Sci. Eng 121(3), 328-335 (Aug 01, 1999) (8 pages) doi:10.1115/1.2832685 History: Received March 01, 1997; Revised May 01, 1998; Online January 17, 2008


In order to study the inward flow of surface materials at back-ends of billets during Al-extrusion, a FEM model has been proposed and a computer program, named FEMBA, have been developed for PCs. The model and the program FEMBA have been described in part one. In this work, the program FEMBA has been used as a tool to study the flow of surface materials at the back-end under different conditions. The influence of process parameters on the inward flow has been studied. It is found that thickness of surface layer, temperatures and friction at the pad/billet contact surface have significant influence on the inward flow of surface materials. Ram speed can have some influence. The influence of temperatures of the billet, container and pad has been studied separately.

Copyright © 1999 by The American Society of Mechanical Engineers
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