Application-specific adjustment of residual stresses during cold extrusion

• Applicant: Professor Dr.-Ing. Peter Groche
• Subject Area: Primary Shaping and Reshaping Technology, Additive Manufacturing
• Term: since 2023
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 531874276

Forming-induced residual stresses (RS) in cold extrusion are primarily caused by inhomogeneous deformation. However, performance improvements that can be achieved without additional process steps through targeted RS introduction, such as improved fatigue strength or corrosion resistance, have not been taken into account in product and process design methods so far. Findings from the previous project in SPP 2013 show far-reaching possibilities for targeted residual stress adjustment in impact extrusion processes through additional degrees of freedom for tool movements. These possibilities are to be tested under industrial conditions within the framework of the proposed transfer project together with the partners Hirschvogel GmbH and Strecon A/S and adapted to these changed conditions. The planned investigations will benefit significantly from the application know-how over the product life cycles of the selected demonstrator components and the extensive design experience of the project partners. Scientific impulses are expected from the extended analysis and evaluation of residual stress optimization. In particular, extensions of the design methods identified as necessary with regard to multi-criteria optimization and new approaches for effort-reducing solutions in tool development could emerge as relevant issues for future work from the transfer project.

• DFG Programme: Research Grants (Transfer Project)
• Application Partner: Hirschvogel Umformtechnik GmbH; Strecon A/S