Formability investigations for the hot stamping process

Yoann Dahan (1, 2) , Yvan Chastel (2, 3) , Patrick Duroux (1) , Philipp Hein (1) , Elisabeth Massoni (2) , Joël Wilsius (1)

1 Research Automotive Applications
2 CEMEF - Centre de Mise en Forme des Matériaux
3 LIM - Laboratoire d'Ingénierie des Matériaux

Arcelor Research is developing a numerical tool to support the feasibility analysis and to optimize the design of hot stamped parts made of USIBOR 1500P®. To provide formability data and to feed the development of a fracture criterion, experimental hot stamping tests are carried out at Cemef (Centre for Material Forming). These hot stamping experiments are based on a modified Nakazima-type test. Results reveal that the achievable strain levels depend on process parameters (stroke, velocity, temperature, friction and heat exchange) and blank parameters (initial temperature, thickness and shape). In parallel, a numerical model of these hot stamping tests has been developed with finite element softwares (Forge2®, Forge3® and Abaqus). The numerical simulations confirm the location and the magnitude of the blank thinning. Furthermore, the numerical results are similar to the experimental measurements in terms of punch load, cooling rate and strain distribution. A formability analysis is then performed to study the influence of the blank geometry and the blank temperature on formability.

Mots clés: Formability; Hot Stamping; Experiment; Numerical Simulation

Domaines: Matériaux

Yoann Dahan, Yvan Chastel, Patrick Duroux, Philipp Hein, Elisabeth Massoni, et al.. Formability investigations for the hot stamping process. International Deep Drawing Research Group (IDDRG) 2006 International Conference, Jun 2006, Porto, Portugal. 8 p. ⟨hal-00566427⟩