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2004 Fiscal Year Final Research Report Summary

Development of Mushy-state Forging Method Using Resistance Heating

Research Project

Project/Area Number 15560093
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Production engineering/Processing studies
Research InstitutionToyohashi University of Technology

Principal Investigator

MAKI Seijiro  Toyohashi University of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (20124315)

Project Period (FY) 2003 – 2004
KeywordsSemi-solid processing / Mushy-state forging / Resistance heating / Aluminum alloys
Research Abstract

With an aim of developing a method for mushy-state forging using resistance heating, experiments and finite element simulations were carried out to clarify the resistance heating characteristics of A357 aluminum alloy billet and find out measures for stable and homogeneous billet heating. In the method, insertion of heat resistant, low thermal conductive austenitic stainless steel SUS304 discs between the copper electrodes and billet as thermal insulators was devised to improve the efficiency of the billet heating. In the original plan, using SUS304 stainless steel clad electrodes was planned, but the research was carried out in the mode of inserting the thermal insulators for easy operation of the experiments. In the resistance heating, it is necessary to apply a contact pressure between the electrodes and billet for ensuring their electric contacts. In the meanwhile, it is strongly desired to suppress the deformation of the billet as much as possible in the heating. It is possible to … More reduce the deformation by decreasing the applied contact pressure, but the excessive decrease causes sparking between the billet and thermal insulators and stops the forging operation. Then, first of all, the condition of the contact pressure on the spark occurrence was investigated in relation to the current density and it was made clear. And then, the thickness of the thermal insulators required for homogeneous billet heating was investigated in relations to both the current density and the contact pressure. Based on the findings through the investigations, experimental mushy-state forging of the aluminum alloy into a gear was made to investigate the influence on the forging condition of the operational conditions of the input electric energy and forging pressure. The results indicated that the mushy-state forging method is highly feasible but the metallurgical structure is strongly influenced by the thickness of the thermal insulators used. Therefore, proper adjustment of the thermal insulator thickness corresponding to each individual case is essential in the practical application. The findings obtained through this study were publicized as listed in the REFERENCES below. Less

  • Research Products

    (13 results)

All 2005 2004 2003

All Journal Article (13 results)

  • [Journal Article] 半溶融鍛造のためのアルミニウム合金ビレットの安定した均一抵抗加熱策2005

    • Author(s)
      牧清二郎, 柴田浩臣, 森謙一郎, 牧野泰育
    • Journal Title

      塑性と加工 46(印刷中)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Research of Favorable Electric Resistance Heating Condition for Aluminum Alloy Billet in MashyState Forging2005

    • Author(s)
      S.Maki, H.Shibata, K.Mori, H.Makino
    • Journal Title

      Journal of the Japan Society for Technology of Plasticity(in Japanese) (in press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Influence of input heat on microstructure in mushy state forging of A357 aluminum alloy using resistance heating2005

    • Author(s)
      Seijiro Maki, Hiroomi Shibata, Ken-ichiro Mori, Hiroyasu Makino
    • Journal Title

      Advanced Technology of Plasticity 2005, Proceedings of the 8th International Conference of Technology of Plasticity (contributed)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 抵抗加熱半溶融鍛造におよぼす通電時面圧の影響2004

    • Author(s)
      牧清二郎, 柴田浩臣, 森謙一郎, 牧野泰育
    • Journal Title

      平成16年度塑性加工春季講演会講演論文集

      Pages: 209-210

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] アルミニウム合金半溶融鍛造への抵抗加熱の応用2004

    • Author(s)
      牧清二郎, 柴田剛志, 森謙一郎, 原田泰典, 牧野泰育
    • Journal Title

      塑性と加工 45

      Pages: 535-539

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Mushy state forging of aluminum alloy using resistance heating2004

    • Author(s)
      Seijiro Maki, Takeshi Shibata, Ken-ichiro Mori, Hiroyasu Makino
    • Journal Title

      STEEL-GRIPS, Suppl.Metal Forming 2004 2

      Pages: 711-716

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Influence of Applied Pressure in Resistance Heating on Mashy-State Forging Billet2004

    • Author(s)
      S.Maki, H.Shibata, K.Mori, H.Makino
    • Journal Title

      The Proceedings of the 2004 Japanese Spring Conference for the Technology of Plasticity(in Japanese)

      Pages: 209-210

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Application of Resistance Heating Technique to Mashy-State Forging of Aluminum Alloy2004

    • Author(s)
      S.Maki, T.Shibata, K.Mori, Y.Harada, H.Makino
    • Journal Title

      Journal of the Japan Society for Technology of Plasticity(in Japanese) 45-522

      Pages: 535-539

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Mushy state forging of aluminum alloy using resistance heating2004

    • Author(s)
      Seijiro Maki, Takeshi Shibata, Ken-ichiro Mori, Hiroyasu Makino
    • Journal Title

      STEEL-GRIPS, Suppl.Metal Forming 2

      Pages: 711-716

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] アルミニウム合金A357の抵抗加熱半溶融鍛造組織2003

    • Author(s)
      牧清二郎, 柴田剛志, 森謙一郎, 原田泰典, 牧野泰育
    • Journal Title

      平成15年度塑性加工春季講演会講演論文集

      Pages: 251-252

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 半溶融鍛造用A357ビレットの抵抗加熱における電気接触性状の影響2003

    • Author(s)
      牧清二郎, 柴田浩臣, 森謙一郎, 原田泰典, 牧野泰育
    • Journal Title

      第54回塑性加工連合講演会講演論文集

      Pages: 295-296

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Microstructure of Aluminum Alloy A357 Mushy-State-Forged under Resistance Heating2003

    • Author(s)
      S.Maki, T.Shibata, K.Mori, Y.Harada, H.Makino
    • Journal Title

      The Proceedings of the 2003 Japanese Spring Conference for the Technology of Plasticity(in Japanese)

      Pages: 251-252

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Influence of Electric Contact Condition on Resistance Heating of A357 Mushy-State Forging Billet2003

    • Author(s)
      S.Maki, H.Shibata, K.Mori, Y.Harada, H.Makino
    • Journal Title

      The Proceedings of the 54th Japanese Joint Conference for the Technology of Plasticity(in Japanese)

      Pages: 251-252

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2006-07-11  

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