Influence of mandrel’s surface on the mechanical properties of joints produced by electromagnetic compression
Hammers, T.1, a; Marré, M.2, b; Rautenberg, J.3, c; Barreiro, P.4, d; Schulze, V.1, e; Löhe, D.1, f; Brosius, A.2, g; Tekkaya, E.2, h
- 1)
- Institute of Materials Science and Engineering I, Universität Karlsruhe (TH), Kaiserstr. 12, Karlsruhe 76131, Germany
- 2)
- Institut für Umformtechnik und Leichtbau, Universität Dortmund, 44227 Dortmund
- 3)
- Institut für Spanende Fertigung, Technische Universität Dortmund, Baroper Str. 301, 44227 Dortmund
- 4)
- EnBW Kraftwerke AG, Kernkraftwerk Philippsburg, Philippsburg 76652, Germany
a) thilo.hammers@iwk1.uni-karlsruhe.de; b) michael.marre@iul.uni-dortmund.de; c) rautenberg@isf.de; d) p.barreiro@kk.enbw.com; e) volker.schulze@iwk1.uni-karlsruhe.de; f) detlef.loehe@iwk1.uni-karlsruhe.de; g) alexander.brosius@iul.uni-dortmund.de; h) erman.tekkaya@iul.uni-dortmund.de
Kurzfassung
Electromagnetic compression of tubular profiles with high electrical conductivity is an innovative joining process for manufacturing of lightweight structures. Taking conventional interference fits into account, the contact area’s influence on the joint’s quality seems to be of significance, as e.g. the contact area and the friction coefficient between the joining partners determine an allowed axial load or torsional momentum straight proportionally. Therefore, contact areas surfaces have been prepared by shot peening and different machining operations and strategies, respectively. The mandrel’s surfaces were prepared by shot peening with glass beads and Al2O3 particles. Alternatively, they were machined by simultaneous five axis milling, because potential joining partners in lightweight frame structures within the Transregional Collaborative Research Centre SFB/TR10 would be manufactured similarly. After that, the manufactured surfaces have been characterized by measuring surface’s roughness and using confocal whitelight microscopy. After joining by electromagnetic compression the influence of different mandrel’s surface conditions on the joint’s mechanical properties were analyzed by tensile tests. Finally, conclusions and design rules for the manufacturing of joints by electromagnetic compression are given.
Schlüsselwörter
electromagnetic compression, joining, shot peening, milling,
Veröffentlichung
In: ICHSF 2008 – 3rd International Conference on High Speed Forming, 11.3.-12.3. 2008, Dortmund, ISBN 3-9809535-3-X, S. 245-256