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Hybrid manufacturing of sheet metals and functionalizing for joining applications via hole flanging

: Bambach, Markus; Ünsal, Ismail; Sviridov, Alexander; Hama-Saleh, Rebar; Weisheit, Andreas

Volltext ()

Production Engineering. Research and development 15 (2021), Nr.2, S.223-233
ISSN: 0944-6524
ISSN: 1863-7353
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ILT ()
hybrid manufacturing; laser metal deposition; lightweight design; hole flanging

Efficient lightweight solutions are of great interest in many industries (aviation, automotive) particularly regarding the limitation of CO2-emissions and material waste. An innovative strategy to address these challenges is the use of hybrid manufacturing. Additive manufacturing (laser metal deposition, LMD) and conventional forming methods (hole-flanging) are used to optimize and functionalize AA 6016 sheet metal parts, which are widely used in the manufacturing of car body parts. First of all, the effects of the additive reinforcements on the mechanical and microstructural properties are investigated using tensile and microstructural tests. After manufacturing reinforced blanks and performing subsequent forming operations, the parts are investigated regarding damages and functionalized through threading. This allows the application of a bolt connection, which is tested through rip-off tests to evaluate the effect of the reinforcements on the fracture forces. It can be shown, that reinforcements can be manufactured without defects and virtually no porosity and the formability is only slightly reduced compared to conventional materials. At the same time, the performance of the reinforced bolt joint can be enhanced while the increase in weight can be limited to relatively small amounts.