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Improving mechanical joining by increasing tool velocity

Vorteile beim mechanischen Fügen mit erhöhter Werkzeuggeschwindigkeit
: Neugebauer, Reimund; Jäckel, Mathias; Kraus, Christian; Kropp, T.

Fulltext urn:nbn:de:0011-n-1945874 (3.0 MByte PDF)
MD5 Fingerprint: daa3de0204fd0e56a35a09c53f3fe852
Created on: 14.2.2012

International Automotive Body Congress, IABC 2011. CD-ROM : September 19-20, 2011, Munich; GPC 2011
München, 2011
11 pp.
International Automotive Body Congress (IABC) <2011, Munich>
Global Powertrain Congress (GPC) <2011, Munich>
Conference Paper, Electronic Publication
Fraunhofer IWU ()
joining; mechanical joining; punch riveting; Fügen; mechanisches Fügen; Stanznieten

In this article, the possibilities for improving the joining process of self piercing solid rivets and self piercing nuts by increasing tool velocity are demonstrated. Thereby, the focus is put on the joining process of high strength steel sheets. Proper and reliable joining of these steels presents a major challenge for mechanical joining techniques. In the conventional joining process, where tool velocities well below 1 m/s are common, different problems during the joining process caused by the high strength of the steel sheets can occur. At the punch riveting process undesirable material flow or unwanted burr development can occur, and at the setting process of self piercing nuts a deformation of the nuts is possible. These problems can be reduced significantly by using elevated tool velocity. In the present paper, characteristics of the joining process at conventional and elevated tool velocity are investigated. The influence caused by different tool velocities within the joining process is shown by cross section- and process force analysis. In the cross section analysis of the mechanical joints it is demonstrated that the quality of connections can be improved significantly due to the usage of elevated tool velocity. The process force analysis of the high speed joining process shows an oscillating progression of tools and joining elements.