New developments in the FE simulation of closed die forging processes
- verfasst von
- Bernd Arno Behrens
- Abstract
Hot forging dies are exposed to a combination of cyclic thermo-mechanical, tribological and chemical loads. Both, wear on the tool surface as well as fatigue crack initiation are the most frequent causes of tool failure. An integral part of the process design and optimization is the FEA based geometry optimisation of forging tools aiming at service life maximisation. So far, the FEA based estimation of the tool life quantity and the critical wear amount is done in a restricted manner as the cyclic die material behaviour is not described with the required accuracy. Therefore, thermo-mechanical fatigue tests were carried out in the present study in order to characterize and describe the cyclic fatigue and material behaviour of tool steels. Moreover, a model for wear estimation that considers thermal effects on the hardness of the tool material was introduced. As friction modelling plays a major role in FEA of forging processes, an improved friction model has been used. The applied model is able to represent the frictional stress between the workpiece and dies realistically, since it considers the changing stress state between the contact pairs.
- Organisationseinheit(en)
-
Institut für Umformtechnik und Umformmaschinen
- Typ
- Aufsatz in Konferenzband
- Seiten
- 30-39
- Anzahl der Seiten
- 10
- Publikationsdatum
- 28.11.2012
- Publikationsstatus
- Veröffentlicht
- Peer-reviewed
- Ja
- ASJC Scopus Sachgebiete
- Maschinenbau, Wirtschaftsingenieurwesen und Fertigungstechnik
