Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg



Hot stamping of devices with local tailored mechanical properties



Project Status: finished

Members


The increasing demand for lightweight production and increasing safety requirements are enforcing the research work on innovative technologies like hot stamping. The non-isothermal hot stamping process is a combination of forming and hardening of quenchable steels in one process step. Due to forming at elevated temperatures higher forming limits can be achieved whereas the controlled cooling strategy yields in higher strength precipitated by martensitic phase transformation. The typical application for this purpose are crash relevant structural components (e.g. B-pillar, side impact protection, etc.) made of the commonly used boron-manganese steel. Within the scope of the transfer project of the German research unit FOR 552, founded by the DFG, a methodology for functional optimized structural devices realized by hot stamping has to be developed. In the first step the focus is on the identification of process relevant possibilities to control the transformation kinetics of the ultra high strength steel 22MnB5, i.e. by the cooling conditions. The results are essential for the development of a FE-based process control strategy to be capable to manufacture components with local tailored mechanical properties. Furthermore the developed process control strategy will be validated with a tool specifically designed for this application.



Research Groups


Publications

    2018

    • Degner, J.; Herrmann, J.; Junker, F.; Berendt, E.; Merklein, M.:
      Leichtbauwerkstoffe für den modernen Automobilbau.
      Zeitschrift Konstruktion 3(2018), pp. 50-54

    2013

    • Merklein, M.; Svec, T.:
      Hot Stamping – Manufacturing functional optimized components.
      Production Engineering Research and Development - Annals of the German Academic Society for Production Engineering WGP 7(2013)2, pp. 141-151

    2012

    • Svec, T.; Merklein, M.:
      Tailored tempering – FE-Simulation of manufacturing components with local adjusted mechanical properties.
      Steel Res. Int. (2012), pp. 283-286

    2011

    • Svec, T.; Grüner, M.; Merklein, M.:
      FE-Simulation of the heat transfer by defined cooling conditions during the hot stamping process.
      Key Engineering Materials 473(2011), pp. 699-706

    • Svec, T.; Merklein, M.:
      Numerische Abbildung des Tailored Tempering Prozess: Wärmeübergang, FE-Simulation und Ableitung des resultierenden Gefüges.
      In: Tekkaya, A. E.; Liewald, M. (Edtrs.): 14. Workshop - Simulation in der Umformtechnik, 2011, pp. 147-154

    • Svec, T.; Merklein, M.:
      Tailored Tempering - Heat Transfer and Resulting Properties in Dependency of Tool Temperatures.
      3rd International Conference on Hot Sheet Metal Forming of High-Performance Steel, Auerbach: Wissenschaftliche Scripten, 2011

    • Merklein, M.; Stöhr, T.; Svec, T.; Wieland, M.:
      Investigations on Parameters Influencing Thermal and Frictional Properties within Hot Stamping.
      Journal of Heat Treatment and Materials (2011)6, pp. 335-341

    • Svec, T.; Merklein, M.:
      Finite-Element basierte Auslegung funktionsoptimierter Bauteile im Tailored Tempering Prozess.
      In: Merklein, M. (Edtr.): 6. Erlanger Workshop Warmblechumformung, Meisenbach, 2011, pp. 59-70

    2010

    • Merklein, M.; Svec, T.:
      Transformation kinetics of the hot stamping steel 22MnB5 in dependency of the applied deformation on the austenitic microstructure.
      In: Kolleck, R. (Edtr.): Proc. 50th Conference of IDDRG 2010, Verlag der technischen Universität Graz, 2010, pp. 71-80

    • Svec, T.; Merklein, M.:
      Auswirkungen spezifischer Abkühlbedingungen auf den Wärmeübergang bei Presshärtprozessen.
      In: Merklein, M. (Edtr.): 5. Erlanger Workshop Warmblechumformung, Meisenbach, 2010, pp. 121-140

    2009

    • Merklein, M.; Lechler, J.; Svec, T.:
      Verformungsabhängiges Umwandlungsverhalten von presshärtbaren Bor-Mangan-Stählen.
      In: Merklein, M. (Edtr.): 4. Erlanger Workshop Warmblechumformung, Meisenbach, 2009, pp. 143 - 161

    Letztes Update: 06.05.2011