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Experimental characterization of heat transfer coefficients for hot stamping AA7075 sheets with an air gap

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Abstract

The heat transfer coefficient (HTC) is critical for hot stamping and in-die quenching. The air gap at interface is a dominant factor affecting the HTC, which is normally resulted from initial tooling clearance and thinning of deformed aluminum sheet. To precisely determine the HTCs under different air gaps, this research performed a comprehensive investigation on determining HTCs between an AA7075 blank and H13 tool steel. Hot stamping experiments were performed with different air gaps enabling HTC values were determined. Using the experimentally calibrated HTC, a finite-element model for hot stamping a door beam was established, which was successfully verified using the experimentation. The good predictions showed the reliability of the HTC values under different air gap conditions.

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Funding

This work was supported by the National Natural Science Foundation of China (No. 51905501); the Fundamental Research Funds for Central Universities (No. 2018-097); the Joint Funds of the National Natural Science Foundation of China (No. U1564202); Beijing Laboratory of Modern Transportation Metal Materials and Processing Technology; and Beijing Key Laboratory of Metal Forming Lightweight.

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Authors and Affiliations

  1. School of Engineering and Technology, China University of Geosciences (Beijing), Beijing, 100083, China

    Wenchao Xiao

  2. School of Mechanical Engineering, Dalian University of Technology, Dalian, 116024, China

    Kailun Zheng

  3. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Baoyu Wang & Xiaoming Yang

  4. Beijing Key Laboratory of Metal Lightweight Forming Manufacturing, Beijing, 100083, China

    Baoyu Wang

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  1. Wenchao Xiao
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  2. Kailun Zheng
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  3. Baoyu Wang
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  4. Xiaoming Yang
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Correspondence to Baoyu Wang.

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Xiao, W., Zheng, K., Wang, B. et al. Experimental characterization of heat transfer coefficients for hot stamping AA7075 sheets with an air gap. Archiv.Civ.Mech.Eng 20, 93 (2020). https://doi.org/10.1007/s43452-020-00091-5

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  • DOI: https://doi.org/10.1007/s43452-020-00091-5

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