Inclusion of hot stamping operations in progressive-die plate forging of tailored high strength gear part

  • Ken-ichiro Mori
  • Tomoyoshi Maeno
  • Makoto Tsuchiya
  • Tatsuhiro Nanya


Hot stamping operations of a quenchable steel sheet were included in progressive-die plate forging to produce a tailored high strength gear part without additional heat treatments. As process design for the inclusion, the former stages in the progressive-die operations for punching and trimming were cold stamping, and subsequently, resistance heating, blanking, forging and die quenching were performed. The plate was partially resistance-heated with a pair of electrodes to produce a tailored gear part having high strength teeth and a ductile remainder. The tooth portion was uniformly heated around 1050 °C in the transversal current direction, and a gear part having teeth having 520 HV2 in hardness was produced. The quality of the teeth was improved by hot semi-blanking with local compression and cold scrap removing. It is found that the combined process of plate forging and hot stamping is useful to produce ultra-high strength steel parts.


Plate forging Hot stamping Tailored part Progressive dies Partial heating Die quenching 


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Copyright information

© Springer-Verlag London 2016

Authors and Affiliations

  • Ken-ichiro Mori
    • 1
  • Tomoyoshi Maeno
    • 2
  • Makoto Tsuchiya
    • 1
  • Tatsuhiro Nanya
    • 3
  1. 1.Department of Mechanical EngineeringToyohashi University of TechnologyToyohashiJapan
  2. 2.Division of Materials Science and Chemical Engineering, Faculty of EngineeringYokohama National UniversityYokohamaJapan
  3. 3.Toyota Boshoku CorporationToyotaJapan

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