Abstract

Hot stamping of ultra-high strength automotive parts requires accurate knowledge of the heat transfer coefficient (HTC) between the blank and tool, since this parameter governs the quenching rate, which, in turn, determines the strength and hardness of the formed part. Inverse heat conduction analysis of subsurface temperature measurements within the die, coupled with temperature measurements made on the blank, appears to be an effective way to infer the HTC, but the ill-posed aspect of this inverse problem sensitizes the HTC to small experimental artifacts. This paper examines how thermocouple installation in the blank and the die can bias the inferred HTC, and suggests techniques that may be used to obtain a reliable HTC estimate.

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