Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Determination of the contact stress distribution between metallic contact partners by means of ultrasonics

Project Status: finished


The quality of cold forging tools is mainly defined by tool life. Together with life time scatter tool life is influenced by the real prestressing conditions, whose quality and quantity is essential for the process stability and tool life. Especially geometrical tolerances of ring and die diameter and roundness and inaccuracies of the assembling process itself lead to an unknown prestressing situation that can deviate significantly from tool to tool. In addition the inhomogeneity of the prestressing situation influences the tool quality considerably. Therefore, aim of this research project is the development of a non-destructive measuring method based on ultrasonics for the determination of the real contact stress distribution in the interface of shrink fits and prestressed cold forging tools.

Letztes Update: 01.01.2010