Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Investigation of the influencing process parameters on hot forming of the high strength steel 22MnB5



Datum: 30.08.2007


Author


Reporter

  • Prof. Dr.-Ing. Dr.-Ing. E.h. mult. Dr. h.c. mult. M. Geiger
  • Prof. Dr.-Ing. K. Roll, Universität Stuttgart

The hot stamping of the high strength steel 22MnB5 is used to produce crash relevant structural car body parts. For this purpose firstly the blanks are austenitized and subsequently formed and simultaneously quenched in a water-cooled tool. By reaching the critical cooling rate the martensitic transformation of the steel is induced. This results in a component strength of circa 1500MPa.
Within the thesis the main influencing parameters during the different process steps as well as their interaction is examined. Emphasis is laid on the investigation of the heat transfer between blank and tool and the determination of the heat transfer coefficient during the different contact situations. In addition to that the characterization of the material properties of the steel 22MnB5 under the specific conditions of the hot stamping process is