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Liquid nitrogen jet impingement cooling of ultra-high strength steel in hot stamping process
CAO Dongsheng, LI Lei, HUANG Haihong
download PDFAbstract. In the hot stamping process, elevated sheet temperatures and uneven die cooling contribute to insufficient thickness uniformity in the formed parts, leading to reduced forming efficiency and inducing severe thermo-mechanical fatigue in the die. To address these issues, a novel in-die liquid nitrogen (LN2) jet impingement cooling method is introduced to achieve a low and uniform initial holding temperature. The high-temperature steel sheet is initially cooled to slightly above the martensitic transition temperature through the application of an LN2 jet during the forming stage, followed by pressure-holding quenching. This method demonstrates remarkable outcomes, including a notable 74.19% reduction in holding time and a substantial 24.72% decrease in the maximum thinning rate. Furthermore, the maximum temperature difference between the upper and lower dies sees significant reductions of 34.57% and 25.84%, respectively.
Keywords
Hot Stamping Dies, Direct Cooling, Jet Impingement
Published online 4/24/2024, 9 pages
Copyright © 2024 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: CAO Dongsheng, LI Lei, HUANG Haihong, Liquid nitrogen jet impingement cooling of ultra-high strength steel in hot stamping process, Materials Research Proceedings, Vol. 41, pp 2901-2909, 2024
DOI: https://doi.org/10.21741/9781644903131-317
The article was published as article 317 of the book Material Forming
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
References
[1] Y. Hong-Mei, Analysis on factors influencing and numerical simulation of hot stamping mold cooling system, Applied Mechanics and Materials, 644-650(2014), pp. 16-20, https://doi.org/ 10.4028/www.scientific.net/AMM.644-650.16.
[2] G.-Z. Quan, Z.-h. Zhang, X. Wang, Y.-l. Li, A. Mao, and Y.-f. Xia, Parameter optimization of cooling system in U-shape hot stamping mold for high strength steel sheet based on MOPSO. Int J Adv Manuf Technol 90, 887–906 (2017). https://doi.org/10.1007/s00170-016-9446-y
[3] R. Muvunzi, D. M. Dimitrov, S. Matope, and T. Harms, A case study on the design of a hot stamping tool with conformal cooling channels. Int J Adv Manuf Technol 114, 1833–1846 (2021). https://doi.org/10.1007/s00170-021-06973-z
[4] P. Hu, B. He, and L. Ying, Numerical investigation on cooling performance of hot stamping tool with various channel designs, Applied Thermal Engineering 96, 338-351, https://doi.org/10.1016/j.applthermaleng.2015.10.154.
[5] S. C. Feng, A. M. Kamat, and Y. T. Pei, Design and fabrication of conformal cooling channels in molds: Review and progress updates, International Journal of Heat and Mass Transfer, vol. 171, no. 121082, 2021, https://doi.org/10.1016/j.ijheatmasstransfer.2021.121082
[6] R. Muvunzi, D. Hagedorn-Hansen, S. Matope, X. Madyibi, C. B. Swart, and M. Nagel, Industry case study: process chain for manufacturing of a large hybrid hot stamping tool with conformal cooling channels, Int J Adv Manuf Technol 110, 1723–1730 (2020). https://doi.org/10.1007/s00170-020-05992-6
[7] M. Naderi, M. Ketabchi, M. Abbasi, and W. Bleck, Analysis of microstructure and mechanical properties of different high strength carbon steels after hot stamping, Journal Of Materials Processing Technology, Article vol. 211, no. 6, pp. 1117-1125, 2011, https://doi.org/10.1016/j.jmatprotec.2011.01.015
[8] S. Yun, S. H. Hong, K. S. Song, J. Kwon, and Y. Kim, Experimental and numerical analyses of quenching performance of hot stamping blanks by two-phase refrigerant cooling using R1234yf, International Journal Of Heat And Mass Transfer, Article vol. 173,pp.121231, 2021, https://doi.org/ 10.1016/j.ijheatmasstransfer.2021.121231
[9] P. Gao, D. Liu, Y. Pei, and S. Feng, Optimal Reynolds number of cooling water in conformal cooling molds, Applied Thermal Engineering, vol. 236, pp. 121509, 2024, https://doi.org/10.1016/j.applthermaleng.2023.121509
[10] D. Chantzis, X. Liu, D. J. Politis, Z. Shi, and L. Wang, Design for additive manufacturing (DfAM) of hot stamping dies with improved cooling performance under cyclic loading conditions, Additive Manufacturing, vol. 37, 2021, no. 101720, https://doi.org/10.1016/j.addma.2020.101720
[11] S. Li, L. Zhou, X. Wu, Y. Zhang, and J. Li, The Influence of Thermal Conductivity of Die Material on the Efficiency of Hot-Stamping Process, Journal Of Materials Engineering And Performance, Article vol. 25, no. 11, pp. 4848-4867, 2016, https://doi.org/10.1007/s11665-016-2332-9
[12] S. Yun, S. H. Lee, K. S. Song, W. Cho, and Y. Kim, Performance improvement of tailored die quenching using material combinations with phase change material in hot stamping, International Journal Of Heat And Mass Transfer, Article vol. 161, 2020, Art no. 120286, https://doi.org/10.1016/j.ijheatmasstransfer.2020.120286
[13] B. Abdulhay, B. Bourouga, C. Dessain, G. Brun, and J. Wilsius, Development of Estimation Procedure of Contact Heat Transfer Coefficient at the Part–Tool Interface in Hot Stamping Process, Heat Transfer Engineering, vol. 32, no. 6, pp. 497-505, 2011, https://doi.org/10.1080/01457632.2010.506362
[14] Y. Suzuki, K.-i. Mori, T. Maeno, K. Sakakibara, and Y. Abe, Improvement of formability using partial cooling during transfer in hot stamping of ultra-high strength steel parts, Procedia Manufacturing, 15(2018), 1119–1126. https://doi:10.1016/j.promfg.2018.07.379
[15] H. Hoffmann, H. So, and H. Steinbeiss, Design of Hot Stamping Tools with Cooling System, CIRP Annals, vol. 56, no. 1, pp. 269-272, 2007, https://doi.org/10.1016/j.cirp.2007.05.062
