Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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Study of a Forging Process for the Application of Boron Steel for Automotive Wheel Nut Material

차량용 Wheel Nut 소재의 보론강적용을 위한 단조공정에 관한 연구

  • Lee, Kwon-Soo (Department of Materials Sci. & Eng. Pukyong National University) ;
  • Ahn, Yong-Sik (Department of Materials Sci. & Eng. Pukyong National University)
  • 이권수 (부경대학교 재료공학과) ;
  • 안용식 (부경대학교 재료공학과)
  • Received : 2016.12.28
  • Accepted : 2017.02.27
  • Published : 2017.04.30
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Abstract

Boron steel (51B20) was cold forged using by new designed dies to apply for automotive aluminum wheel nut. The formability and mechanical properties of boron steel were compared with carbon steel(S45C) which has been used up to date for the wheel nut material. The formability was investigated on the dies designed with various types of punch nose using by FEM. The metal flow and compressive stress on the dies during cold forging were investigated and compared each other. The forging process with a new designed die showed the improved metal flow with a reduced forging load which resulted in the significant increase of the die life. It was recommended that the carbon steel for automotive wheel nut material could be substituted by the boron steel.

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References

  1. T. Altan, 2006, "Hot-stamping boron-alloyed steels for automotive parts, Part 1; Process method and uses" Stamping Journal, December
  2. U. Engel and M. Aensel, 1990, "FEM-Simulation of Fatigue Crack Growth in Cold Forging Dies", Adv. Tech. Plast.. Vol. 1, pp. 355-360.
  3. Z. Xing-hua, 1990, "Finite Element Analysis of Container and Accuracy Control of Extrusion Products", Adv. Tech. Plast.. Vol. 1, pp. 343-348.
  4. J. B. Hawkyard, T. Hirai, T. Ishise and T. Katayama, 1984, "Optimisation of Shrink Ring Interference Configuration for Metal Forming Die", Adv. Tech. Plast., Vol. 2. pp. 912-917.
  5. K. F. Hoffmann and K. Lange, 1989, "Computation of the Elastic Expansion and Stresses in Cold Extrusion Dies with Non-Axisymmetric Inner Shape", Trans. NAMRI of SME, Vol. XVII, pp. 71-78.
  6. S. Takahashi and C. A. Brebbia, 1990, "Forging Die Stress Analysis Using Boundary Element Method", Adv. Tech. Plast.. Vol. 1, pp. 203-210
  7. Y. Ochial and R. Wadabayashi, 1987, "Application of boundary Element Method to Cold Forging Die Design", Adv. Tech. Plast.. Vol. 1, pp. 37-42.
  8. M. Fu and B. Shang, 1995, "Stress Analysis of the Precision Forging Die for a Bevel Gear and its optimal Design Using the Boundary- Element Method", J. Mat. Proc. Tech.. Vol. 53, pp. 511-520. https://doi.org/10.1016/0924-0136(94)01754-O
  9. S. M. Lee, Y. K. Kim, H. G. Choi, J. K. Lee, Y. K. Cho, Y. T. Park and C. Y. Kang, 2010, "Effect of Forging Condition on the Microstructure and Mechanical Properties of Centrifugal Casted 9Cr-1Mo Heat- Resisting Steel", Journal of the Korean Society for Power System Engineering, Vol. 14, pp. 84-89.
  10. S. Y. Kang, J. S. Lee, C. H. Kim, H. K. Lee, and K. N. Lee, 1996, "Application status for automotive parts of press hardening process", Transactions of Materials Processing, Vol. 5, pp. 263-268.