Articles techniques et présentations

The hot stamping of boron steels for producing complex structural components of the car body-in-white is more and more widespread. Optimization of sheet forming technologies at elevated temperatures is still troublesome, since the thermal, mechanical and metallurgical phenomena interacting during hot stamping force to feed the numerical model of the process by a huge amount of data, most of which implying not standardized tests. This is the case of the evaluation of heat transfer coefficient between the metal sheet and the forming dies. The objective of the paper is therefore the development of a robust procedure to evaluate the Heat Transfer Coefficient (HTC) with dies in hot stamping operations of boron steels.