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Development of concurrent stamping-piercing trimless hot stamping process

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Abstract

After a material undergoes hot stamping, post-processes are required to ensure that the final product has the expected quality. Typical post-processes are mechanical or laser trimming and piercing. These post-processes are expensive and time consuming because when the material undergoing hot stamping cools, its strength becomes very high. The purpose of this study was to develop a concurrent stamping–piercing trimless hot stamping process in which the hot stamping and hot piercing processes could be carried out in one operation for manufacturing automotive side sills. To achieve this purpose, first, a trimless blank was designed by carrying out an integrated numerical analysis including computational fluid dynamics and finite element analyses and employing an optimization technique. The process conditions for the hot piercing process were set based on the results of the finite element analysis of hot piercing process. Finally, the effectiveness of the developed hot stamping process was validated by performing a hot stamping experiment.

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Authors and Affiliations

  1. Ultimate Manufacturing Technology Group, Korea Institute of Industrial Technology, 320 Techno Sunhwn-ro, Yuga-myeon, Dalseong-gun, Daegu, 42994, Korea

    In-Kyu Lee, Sung-Yun Lee & Sang-Kon Lee

  2. School of Mechanical Engineering, Pusan National University, Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan, 46241, Korea

    In-Kyu Lee & Byung-Min Kim

Authors
  1. In-Kyu Lee
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  2. Sung-Yun Lee
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  3. Byung-Min Kim
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  4. Sang-Kon Lee
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Corresponding author

Correspondence to Sang-Kon Lee.

Additional information

Recommended by Associate Editor Dae Cheol Ko

In-Kyu Lee received his B.S. degree (2010) in Department of Mechanical and Automotive Engineering from International University of Korea in 2010, and his M.S. degree (2012) in National Core Research Center for Hybrid Materials Solution from Pusan National University in Korea. He is currently a Researcher at the Ultimate Manufacturing Technology Group at Korea Institute of Industrial Technology (KITECH), and Ph.D. candidate of Department of Mechanical Engineering at Pusan National University in Korea. His research interests include cold/hot forging, die design technology.

Byung-Min Kim received his B.S. (1979), M.S. (1984) and Ph.D. (1987) degrees from Pusan National University, Korea, in 1979, 1984 and 1987, respectively. Dr. Kim is currently a Professor at the School of Mechanical Engineering, Pusan National University in Busan, Korea. His major research field is production and manufacturing based on metal forming.

Sang-Kon Lee received his B.S. (1998), M.S. (1998), and Ph.D. (2008) from Pusan National University in Korea. Dr. Lee is currently the Chief Officer/Principal Researcher at the Ultimate Manufacturing Technology Group at Korea Institute of Industrial Technology (KITECH) in Korea. His major research fields are metal forming technologies including wire and shape drawing, aluminum/magnesium extrusion, and cold/hot forging process.

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Lee, IK., Lee, SY., Kim, BM. et al. Development of concurrent stamping-piercing trimless hot stamping process. J Mech Sci Technol 31, 1885–1891 (2017). https://doi.org/10.1007/s12206-017-0336-5

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  • DOI: https://doi.org/10.1007/s12206-017-0336-5

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