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Application of CAD to Maximising DIE Life Based on the Estimation of Working Stresses

  • T. Hirai
  • T. Katayama
  • K. Akamatsu
  • J. B. Hawkyard
Chapter

Abstract

This paper deals with the effect of the geometry of the die-shrink ring interface on the stress concentration occuring in the bore of a cold forging die. The aim is to minimize the stress concentration at the fillet radius in the bore and achieve an improvement in die life. The work is mainly analytical, using elastic stress analysis and finite element methods to determine the data base. Using the data base, the penalty function method (SUMT method) is applied to obtain the configuration of the die-shrink ring interface. A suitable fitting pressure distribution is achieved by using slightly different taper angles on the die and shrink ring. The working stress distribution along the die surface is complex and optimisation should be very advantageous.

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References

  1. 1).
    T. Hirai, S. Tsukuma, T. Fujii and T. Azuma: Bulletin of the JSME Vol.21, No. 162, 1978.CrossRefGoogle Scholar
  2. 2).
    T. Hirai and T. Ishise: Proc. of 21st Int. M.T.D.R. Conf., 1980.Google Scholar
  3. 3).
    J.B. Hawkyard, T. Hirai, T. Ishise and T. Katayama; Advanced Technology of Plasticity, 1984, Vol. II.Google Scholar
  4. 4).
    T. Hirai, T. Ishise: Int. J. of Machine Tool Design and Research, (Plastic Metal Flow Under Frictional Boundary in Forward Extrusion Die), to be published.Google Scholar

Copyright information

© Department of Mechanical Engineering University of Manchester Institute of Science and Technology 1986

Authors and Affiliations

  • T. Hirai
    • 1
  • T. Katayama
    • 1
  • K. Akamatsu
    • 2
  • J. B. Hawkyard
    • 3
  1. 1.Doshisha UniversityKyotoJapan
  2. 2.Akamatsu Alloy Tool LtdOsakaJapan
  3. 3.UMISTUK

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