[ Papers ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 31, No. 1, pp.19-27

ISSN: 2508-5107 (Online)

Print publication date 15 Feb 2022

Received 10 Jan 2022 Revised 19 Jan 2022 Accepted 07 Feb 2022

DOI: https://doi.org/10.7735/ksmte.2022.31.1.19

FEM을 이용한 셀프 피어싱 리벳 냉간압조 해석

이상철^a ; 현재호^a ; 홍승우^a ; 원권희^a ; 박희수^a ; 현승균^a ; 김상열^a^{, *}

Analyzing Cold Heading of Self-Piercing Rivet Using FEM

Sangchul Lee^a ; Jaeho Hyun^a ; Seung-Woo Hong^a ; Kwon Hee Won^a ; Heesoo Park^a ; Soongkeun Hyun^a ; Sang-Yeol Kim^a^{, *}

aManufacturing Innovation School, Inha University

Correspondence to: ^*Tel.: +82-32-720-9050 E-mail address: skyfgh@inha.ac.kr (Sang-Yeol Kim).

Abstract

Self-piercing rivets (SPR) are manufactured using multistage cold heading of a constant length of steel wire rods. This study attempted to design molds for tolerable loading to material and make the metal flow of the SPR lines parallel and without cusp. During this process, beyond the existing virtual experiment, which was limited to the plastic deformation of the SPR material, the analysis of the molds’ stress, elastic deformation, and wear were simultaneously performed. This study mainly aimed to mimic the multistage cold process of the heading machine for manufacturing SPR using DEFORM (commercial finite element method software) and minimize differences between with manufacturing sites. Furthermore, deviating from the existing mold development process (shape design with trial and error), the development efficiency was maximized by the reduction of both the mold development period and the mold cost. Finally, the hardness homogenization of the manufactured SPR with a tempering finished was verified.

Keywords:

Self-piercing rivet, Finite element method, Dissimilar material, Cold heading, Tool wear, Metal flow lines

Acknowledgments

이 논문은 2021년도 정부(중소벤처기업부)의 재원으로 중소기업기술정보진흥원의 지원을 받아 수행된 연구임(S3073212, 2021년 중소기업기술혁신개발사업)

References

Park, K.Y., 2020, Evaluation of Self-Piercing Rivet Joint Quality for Various Materials Using FEM, Master Thesis, Inha University, Republic of Korea.
Jeon, N.-K., 2019, A Study of CFRP-Metal Dissimilar Joint with Self-piercing Riveting, Master Thesis, Hanyang University, Republic of Korea.
Byun, H.-S., Kim, Y.-H., 2011, A Study on the Manufacturing Technology of a Folding Blind Rivet, J. Korean Soc. Manuf. Technol. Eng., 20:1 67-73.
Kim, D. B., Lee, M. Y., Park, B. J., Park, J. K., Cho, H. Y., 2012, Forging Process Design of Self-Piercing Rivet for Joining Dissimilar Sheet Metals, J. Korean Soc. Marine Eng., 36:6 802-807. [https://doi.org/10.5916/jkosme.2012.36.6.802]
Epler, M. E., Misiolek, W. Z., 2006, Experimental Evaluation Method for Determination of Friction Characteristics and Performance of Cold Heading Coatings, Wear, 260:7-8 909-914. [https://doi.org/10.1016/j.wear.2005.06.016]
Cho, H. Y., Lee, I. H., Kim, K. W., Kim, D. B., Shin, H. S., 2012, Dies Design of SPR Forging Using Finite Element Method, Journal of Industrial Science and Technology Institute, 26:2 13-18.
Lee, S. C., 2022, A Computational Study on Shape Design and Forming of Self-Piercing Rivet for High-Strength Steel and Aluminum Alloy Sheet, Master Thesis, Inha University, Republic of Korea.
Kim, J., Kim, C., 2010, Analysis of Filling and Stresses in the Hot Forging Process Depending on Flange Die Shapes, Trans. Korean Soc. Mech. Eng. A, 34:4 423-430. [https://doi.org/10.3795/KSME-A.2010.34.4.423]
Choi, M. H., Jin, H. T., Joun, M. S., 2015, Effect of Flow Stress, Friction, Temperature, and Velocity on Finite Element Predictions of Metal Flow Lines in Forgings, Transactions of Materials Processing, 24:4 227-233. [https://doi.org/10.5228/KSTP.24.4.227]
Kim, Y. S., Park, K. C., Nam, J. B., Lee, B. H., 2015, Die Materials and their Wear Evaluation for Press Forming of High Strength Steels, Transactions of Materials Processing, 24:2 138-146. [https://doi.org/10.5228/KSTP.2015.24.2.138]
Ann, K. H., Cho, H. Y., Heo, S. J., Kang, J. H., 2019, A Study on the Cold Forging Die Design for the Adapter of Automobile Engine Mount considering Tool Service Life, J. Korean Soc. Precis. Eng., 36:12 1107-1115. [https://doi.org/10.7736/KSPE.2019.36.12.1107]
Ann, K.-H., Kang, J.-H., Heo, S.-J., Shin, T.-S., Cho, H.-Y., 2020, Multistage Cold Forging Process Design of Al6082 Considering Forming Limit, J. Korean Soc. Manuf. Process Eng., 19:9 93-99. [https://doi.org/10.14775/ksmpe.2020.19.09.093]
Xie, B.,Cai, Q., Yu, W., Cao, J., Yang, Y., 2014, Effect of Tempering Temperature on Resistance to Deformation Behavior for Low Carbon Bainitic YP960 Steels, Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process., 618 586-595. [https://doi.org/10.1016/j.msea.2014.09.054]
Yoo, H., Yoo, S., Lee, S., 2003, Material Test, Chungho Publishing, Republic of Korea.