Abstract

MUVUNZI, R; DIMITROV, DM; MATOPE, S  and  HARMS, TM. Heat transfer in a hot stamping process: a review. R&D j. (Matieland, Online) [online]. 2017, vol.33, pp.75-84. ISSN 2309-8988.

Heat transfer rate during the hot stamping process affects the resultant quality and production rate of the process. This is because the ability of the tool to transfer heat from the blank affects the resultant tensile strength, temperature distribution and cooling time of the formed part. Research efforts have been made on the design of cooling systems that are aimed towards improving the cooling effectiveness of the blanks thereby improving the quality characteristics of the formed parts. The cooling rate is governed by the interfacial heat transfer coefficient (IHTC). A proper design of hot stamping tools requires knowledge of the heat transfer modes during the hot stamping process. It is important to gain an understanding of the heat transfer scenarios during the process to seek opportunities to reduce the cooling time and improve the quality ofparts. The purpose of this article is to review the heat transfer phases during the hot stamping cycle and propose a model for the heat loss by the blank during the process. A review of the models that can be utilized to determine IHTC is presented.

Keywords : Die design; hot sheet metal forming; heat balance; heat transfer model; cooling layout design.

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