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Influences on the part quality in conventional deep drawing processes

 
: Altpeter, I.; Kopp, M.; Kröning, M.; Milch, M.; Schäffner, C.; Behrens, B.-A.

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Fulltext urn:nbn:de:0011-n-505553 (958 KByte PDF)
MD5 Fingerprint: c904d6045bd23224ea1958312d93d5d4
Created on: 27.8.2009


Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V. -DGZfP-, Berlin; European Federation for Non-Destructive Testing -EFNDT-:
9th European Conference on NDT. ECNDT Berlin 2006. CD-ROM : September 25 - 29, 2006
Berlin: DGZfP, 2006 (DGZfP Proceedings BB 103-CD)
ISBN: 3-931381-86-2
pp.Fr.1.7.3
European Conference on NDT (ECNDT) <9, 2006, Berlin>
English
Conference Paper, Electronic Publication
Fraunhofer IZFP ()
micromagnetic multiparameter microstructure and stress analysis; residual stress measurement; Barkhausen noise; spring back

Abstract
Trends in the automotive industry tend towards safety, fuel saving and reduction of exhaust gas result in an increased application of high strength steels as well as stainless steels in the car body production. Deep drawing is a ension/compression forming process of a sheet metal blank to a hollow part without a volitional thickness changing. This permanent deformation occurs when the applied stress exceeds the elastic limit of the material. The elastic deformation within the overall amount of deformation is not desired and leads to the so called spring back, which is directly related to the materials strength, sheet thickness and Young's modulus. Besides strength and elastic modulus there are more factors affecting the part quality or the spring back behavior of deep drawn components. This paper will cover the effect of relevant forming parameters, as there are the die radius, the height of the beads and the drawing clearance. Furthermore, the residual stresses, which are correlated with spring back, were measured by means of the 3MA sensor (Micromagnetic Multiparameter Microstructure- and Stress-Analyses).

: http://publica.fraunhofer.de/documents/N-50555.html