Analyzing the Tribological Phenomena in Hot Extrusion Processes by
Pavel Hora, 1 Maysam Gorji, 1 Joachim Maier, 2
using New Torsion-Tribo Test
ETH Zurich, 1 Institute of Virtual Manufacturing, Zurich, Switzerland
WEFA Singen GmbH, 2 Singen, Germany
Track: EXTRUSION/DIE THEORETICAL - Friction and Pickup
ABSTRACT—During the extrusion processes, very complex adhesion and friction effects
between the die surface and the extruded material occur. They have a strong influence on the
velocity distribution in the profile, as well as on the life-term behavior of the tools. In the
framework of this study, a recently developed experiment called the Torsion-Tribo test will be
presented. The test allows the investigation of low- and high-pressure load cases. The
experimental layout of the test tools and specimen, the evaluation method, as well as
measurements for different coatings will also be presented. The experimental data enable the
investigation of the friction due to contact pressure, rotational velocity, and temperature. Those
data are used to determine the parameters of an advanced friction model.
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