Characterization of the interfacial heat transfer coefficient for hot stamping processes

10th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes

Luan, Xi^1 ; Liu, Xiaochuan^1 ; Fang, Haomiao^1 ; Ji, Kang^1 ; El Fakir, Omer^1 ; Wang, Liliang^1

Department of Mechanical Engineering, Imperial College London, SW7 2AZ, United Kingdom^1

关键词: Contact pressures;    Hot stamping process;    Interfacial heat transfer coefficients;    Precise control;    Processing parameters;    Quenching rate;    Resulting materials;    Stamping tools;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/734/3/032079/pdf
DOI  :  10.1088/1742-6596/734/3/032079

来源: IOP

【 摘 要 】

In hot stamping processes, the interfacial heat transfer coefficient (IHTC) between the forming tools and hot blank is an essential parameter which determines the quenching rate of the process and hence the resulting material microstructure. The present work focuses on the characterization of the IHTC between an aluminium alloy 7075-T6 blank and two different die materials, cast iron (G3500) and H13 die steel, at various contact pressures. It was found that the IHTC between AA7075 and cast iron had values 78.6% higher than that obtained between AA7075 and H13 die steel. Die materials and contact pressures had pronounced effects on the IHTC, suggesting that the IHTC can be used to guide the selection of stamping tool materials and the precise control of processing parameters.