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Partial strengthening method for cold stamped B-pillar with minimal shape change

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Abstract

The partial strengthening method for pre-stamped panels both avoids excessive strength enhancement over the entire product and substantially reduces the processing cost compared to conventional hot press forming. In this paper, we propose two types of partial strengthening processes to selectively increase the local strength of a cold stamped B-pillar by utilizing an induction coil system and water spray quenching to induce the martensitic transformation in the target region. Thermo-mechanical FE analyses were conducted to evaluate the effect of the process parameters such as the quenching rate, quenching time, and heating width on the shape changes during the partial strengthening processes while simultaneously considering the thermal dilatation and transformation plasticity.

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Funding

This work was financially supported by the “Forming analysis of center pillar stiffener with partial strengthening techniques” program of the Production Development Division Department, HYUNDAI Motors Group, and “Human Resources Program in Energy Technology” program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) under the Ministry of Trade, Industry and Energy, Republic of Korea (no. 20174010201310).

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Author notes

  1. Kwangyoon Kim and Youngnam Song contributed equally to this work.

Authors and Affiliations

  1. Department of Mechanical Design Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea

    Kwangyoon Kim & Youngnam Song

  2. Production and Development Division, Hyundai Motor Company, 37, Cheoldobangmulgwan-ro, Uiwang-si, Gyeonggi-do, 16082, Republic of Korea

    Wooho Yang & Hyuncheol Choi

  3. School of Materials Science and Engineering, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu, 41566, Republic of Korea

    Sung Hyuk Park

  4. Department of Mechanical Engineering, Hanyang University, 55, Hanyangdaehak-ro, Sangnok-gu, Ansan-si, Gyeonggi-do, 15588, Republic of Korea

    Jonghun Yoon

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  1. Kwangyoon Kim
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  2. Youngnam Song
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  3. Wooho Yang
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  4. Hyuncheol Choi
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Correspondence to Jonghun Yoon.

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Kim, K., Song, Y., Yang, W. et al. Partial strengthening method for cold stamped B-pillar with minimal shape change. Int J Adv Manuf Technol 102, 4241–4255 (2019). https://doi.org/10.1007/s00170-019-03516-5

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  • DOI: https://doi.org/10.1007/s00170-019-03516-5

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