Interactions Between Mechanical and Thermal Stresses
Gernot Strehl, S+C Extrusion Tooling Solutions GmbH, Lindlar, Germany
in Extrusion Containers
Track: EXTRUSION EQUIPMENT - Container and Tooling
ABSTRACT—Extrusion containers, due to their design from two or three parts which are shrunk
together, are not as rigid structures as they may appear at first sight. Mechanical loads are imposed on
the container via the billet from the extrusion press. Insufficient choice of materials, or losses in
mechanical properties due to overheating, lead to phenomena that can drastically reduce the
performance of the press. Plastic deformations or cracks in one or all parts of the containers belong to
these effects. Often stresses generated by uneven temperature distributions contribute to these
phenomena. In some cases they are the principal reason for container damage. Such distorted
temperature distributions can be generated already during the heating-up phase or by the use of
container housings, which are not fitting to the container. For most of the mentioned phenomena,
stress calculations are executed and where possible, linked to examples. The basics of the stress
calculation are presented, as well as solutions to the described problems.
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