Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Optimal Stiffness Design of Self-Piercing Riveting's C-Frame for Multimaterial Joining

다종소재 접합을 위한 SPR(Self-Piercing Riveting)용 C-프레임 강성 최적설계

  • 신창열 (경북하이브리드부품연구원) ;
  • 이재진 (경북하이브리드부품연구원) ;
  • 문지훈 (경북하이브리드부품연구원) ;
  • 권순덕 (경북하이브리드부품연구원) ;
  • 양민석 (한국생산기술연구원) ;
  • 이재욱 (한국생산기술연구원)
  • Received : 2021.03.17
  • Accepted : 2021.04.03
  • Published : 2021.05.31
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Abstract

In this study, an optimal stiffness model of the C-frame, which was supporting the mold and tool load, was proposed to obtain quality self-piercing riveting (SPR) joining. First, the load path acting on the C-frame structure was identified using topology optimization. Then, a final suggested model was proposed based on the load path results. Stiffness and strength analyses were performed for a rivet pressing force of 7.3 [t] to compare the design performance of the final proposed model with that of the initial model. Moreover, to examine the reliability of continuous and repeated processes, vibration analysis was performed and the dynamic stiffness of the final proposed model was reviewed. Additionally, fatigue analysis was performed to ascertain the fatigue characteristics due to simple repetitive loading. Finally, stiffness test was performed for the final proposed model to verify the analysis results. The obtained results differed from the analysis result by 2.9%. Consequently, the performance of the final proposed model was superior to that of the initial model with respect to not only the SPR fastening quality but also the reliability of continuous and repetitive processes.

Keywords

Acknowledgement

This study was supported by the Ministry of Trade, Industry, and Energy-Industrial Technology Innovation project, i.e., "Development of high strength aluminum 7000 series production system using thermal formation technology (Project No.: 20010987)" and by a research grant from the Korea Institute of Industrial Technology.

References

  1. Chang, I,. Cho, Y., Park, H. and So, D., Importance of Fundamental Manufacturing Technology in the Automotive Industry and the State of the Art Welding and Joining Technology, Journal of Welding and Joining, Vol. 34, No, 1, pp. 21-25, 2016. https://doi.org/10.5781/JWJ.2016.34.1.21
  2. Automotive Circle Int., EuroCarBody 2012, 14th Global Car Body Benchmarking Conference, (2012)
  3. Website: https://www.boellhoff.com/
  4. Kim, D. B., Lee, M. Y., Park, B. J., Park, J. K., Cho, H. Y., "Forging Process Design of Self-Piercing Rivet for Joining dissimilar Sheet Metals", Journal of the Korean Society of Marine Engineering, Vol. 33, No. 6, pp. 802-807, 2012.
  5. Kim, D. B., Qiu, Y. G., Cho, H. Y., "Design of self-piercing rivet to joint in advanced high strength steel and aluminium alloy sheets," Journal of Welding and Joining, Vol. 33, No. 3, pp. 75-80, 2015 https://doi.org/10.5781/JWJ.2015.33.3.75
  6. Kim, D. Y., Kim, D. O., Cheon, S. S., "Experimental Investigation on Fatigue Characteristics of SPR (Self-Piercing Rivet) and Hybrid Joints," Journal of the Korean Society for Precision Engineering, Vol. 35, No. 3, pp.335-340, 2018. https://doi.org/10.7736/kspe.2018.35.3.335
  7. Jung, Y. S., Lee, G. I., Kim, J. Y., "Study on Optimal Design of F-Apron of Vehicles by Multi-material Bonding," Journal of the Korean Society of Manufacturing Process Engineers, Vol. 18, No. 2, pp. 102-107, 2019. https://doi.org/10.14775/ksmpe.2019.18.2.102
  8. Jeong, T. E., Kim, T. E., Rhee, S. H., Kam, D. H., "Joint Quality Study of Self-piercing Riveted Aluminum and Steel Joints Depending on the Thickness and Strength of Base Metal," Journal of Welding and Joining, Vol. 37, No. 3, pp. 212-219, 2019. https://doi.org/10.5781/jwj.2019.37.3.3