Production of Crankshafts by Clamp Shearing

  • Takeo Nakagawa
  • Koichi Shiomori


A crankshaft can be produced from a bar by stopping the clamp-shearing operation in the middle of the press stroke. This paper deals with the technical development of the production process. In the preliminary shearing test of 15 mm bars of copper and mild steel, the optimum shear-forming conditions and the strength of the connected shear-formed zone were experimentally investigated. This was successfully applied to the actual production of a crankshaft of Al-63S in an electrical business machine. The newly developed clamp-shearing tool for making crankshafts has been working for the last three years and its construction is discussed in detail in this paper.


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  1. 1.
    T. Nakagawa and T. Maeda. Billet production by clamp shearing method. Preprint 4th Int. Cold Forging Conf., Düsseldorf. 1970. p. 351.Google Scholar
  2. 2.
    T. Nakagawa and K. Miyamoto. Tool-life test in clamp shearing of steel bar and wire. Proc. 12th Int. MTDR Conf. 1971, p. 567.Google Scholar

Copyright information

© Macmillan Publishers Limited 1975

Authors and Affiliations

  • Takeo Nakagawa
    • 1
  • Koichi Shiomori
    • 2
  1. 1.Institute of Industrial ScienceUniversity of TokyoRoppongi, Minato-ku, TokyoJapan
  2. 2.Tokyo Shibaura Electric Co. LtdYanagi-cho, Kawasaki-shiJapan

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