Analysis and design of flat-die hot extrusion process 1. Three-dimensional finite element analysis

✍ Scribed by Guen-An Lee; Dae-Young Kwak; Soo-Young Kim; Yong-Taek Im

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 573 KB
• Volume: 44
• Category: Article
• ISSN: 0020-7403
• DOI: 10.1016/s0020-7403(02)00029-2

✦ Synopsis

Non-steady-state-coupled three-dimensional analysis is required for investigating complex material ow in practical at-die hot extrusion processes of aluminum alloys in various channel sections. It is important since the material ow behavior actually determines the amount of distortion of the extruded product. Thus, a non-steady thermo-rigid-viscoplastic ÿnite element program was developed for numerical simulations of the process. Since severely deforming elements of the workpiece can easily interfere with the sharp edges of the at-die, an automatic remeshing module based on a simple section-sweeping scheme and new contact algorithm were incorporated to allow continuous simulation without manual intervention with less volume loss and computation time. With developed ÿnite element program, non-steady ÿnite element analyses of extrusion processes were carried out for two types of channel-section with constant bearing length of 5 mm. From simulation results, it was found that the exit velocity of the workpiece varied depending on the cross-sectional thickness of the exit and the amount of de ection of the workpiece was not greatly a ected by variations of either the workpiece temperature or punch velocity under the present simulation conditions.