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Study on the shaping of geard parts by two-step extrusion method

Research Project

Project/Area Number 13650115
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 機械工作・生産工学
Research InstitutionShizuoka University

Principal Investigator

SAWAKI Yozo  Shizuoka University, Engineering, Professor, 工学部, 教授 (30005417)

Co-Investigator(Kenkyū-buntansha) YOSHIDA Hajime  Shizuoka University, Engineering, Assistant, 工学部, 助手 (90283340)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2003: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2001: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsPlastic working / Extrusion / Gear / Redunction in area / Finite element method / 充てん
Research Abstract

In conventional extrusion method for the formation of a gear, more than 25% reduction in area of the workpiece is needed to shape the complete gear profile. On the contrary, in two-step extrusion method, it is shown that the lowest value of the reduction in area to shape complete gear is only 7% and puntch pressure is 460MPa.
These results shows that the two-step extrusion method is quite advantageous to shape geared parts. In order to clear out the reason of this advantage, the material flow during extrusion was investigated by the finaite element methods. This analysis showed quantitatively, that the circumfential material flow in two-step method restrained the material flow toward radialy inward direction. It is also found that from the shapability stand point of view, higher thickness of tooth in the first step of the die is preferable and smaller semidie angle is prefered to lower the shaping pressure. The finite element analysis simulating these effects is performed and is cleared that this die can well produce the complete tooth even with much lower punch pressure. This also shows that finite element analysis can be used as a useful tool to simulate the gear shaping process.
Gear shaping experiments can be well simulated by the finaite element analysis and this analysis can be a useful tool to determine an optimal die design. Although future research is needed to clear the process, much more finite element analysis will help easy determination of optimal die geometry.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] 沢木洋三: "はすば歯車の冷間押出し成形"塑性と加工(日本塑性加工学会誌). 43. 634-638 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 沢木洋三: "外径絞りを伴う二段充てん法による平歯車の成形"塑性と加工(日本塑性加工学会誌). 44. 462-466 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 沢木洋三: "外径を絞らない二段充てん法による平歯車の成形"塑性と加工(日本塑性加工学会誌). (投稿中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Sawaki: "Shaping of Helical Gear by Cold Extrusion"J.Japan Soc.Tech.Plasticity. 43. 634-638 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Sawaki: "Shaping of Spur Gear by Two-Step Extrusion Method"J.Japan Soc.Tech.Plasticity. 44. 462-466 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Sawaki: "Shaping of Spur Gear by Two-Step Extrusion Method without Reducing Outer Diameter of Workpiece"J.Japan Soc.Tech.Plasticity. (in print). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 沢木洋三, 吉田始, 坂井田喜久, 鈴木正: "外径絞りを伴う二段充てん法による平歯車の成形"塑性と加工. 4巻507号. 462-466 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 沢木洋三, 吉田始, 坂井田喜久, 鈴木裕司: "浸炭試料を用いた平歯車の成形"平成15年度塑性加工春期講演会講演論文集. 71-72 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 吉田始, 沢木洋三, 坂井田喜久, 鈴木正: "二段充てん法による低断面減少率下での平歯車の成形"平成15年度塑性加工春期講演会講演論文集. 73-74 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 吉田始, 沢木洋三, 坂井田喜久: "高炭素鋼試料による平歯車の押出し成形"日本機械学会第11回機械材料・材料加工技術講演会講演論文集. 303-304 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 吉田始, 沢木洋三, 坂井田喜久, 磯谷章, 鈴木裕司: "内径拡張による歯付き部品の成形"日本機械学会関東支部山梨講演会講演論文集. 247-248 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 吉田始, 沢木洋三, 坂井田喜久, 鈴木裕司: "内径拡張による平歯車の成形"第54回塑性加工連合講演会講演論文集. 157-158 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 吉田 始: "二段充てん法による低断面減少率下でのはすば歯車の押出し成形"平成14年度塑性加工春期講演会講演論文集. 441-442 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 沢木洋三: "はすば歯車の冷間押出し成形"塑性と加工. 43・498. 60-64 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 吉田 始: "はすば歯車の成形に及ぼすねじれ角の影響"日本機械学会東北支部八戸地区講演会講演論文集. NO.021-2. 139-140 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 吉田 始: "押出しによるはすば歯車の成形荷重"日本機械学会関東支部山梨講演会講演論文集. NO.020-4. 307-308 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 沢木洋三: "二層試料を用いた二段充てん法によるはすば歯車の成形"第53回塑性加工連合講演会. 381-382 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 沢木洋三: "浸炭試料を用いた平歯車の押出し成形"平成15年度塑性加工春期講演会講演論文集. (発表予定). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 吉田 始: "層状試料の押出しによるはすば歯車の成形"平成13年度塑性加工春期講演会講演論文集. 231-232 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 沢木洋三: "二段充てん法を用いた低断面減少率下での平歯車の成形"平成13年度塑性加工春期講演会講演論文集. 233-234 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 吉田 始: "平歯車の押出し成形に及ぼすダイス形状の影響"日本機械学会東海支部岐阜地区講演会講演論文集. NO.113-2. 138-139 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 吉田 始: "押出し成形されたはすば歯車の精度"題52回塑性加工連合講演会. 123-124 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 吉田 始: "スプライン穴付きはすば歯車の成形"日本機械学会山梨講演会講演論文集. NO.113-22. 25-26 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 吉田 始: "二段充てん法による低断面減少率下でのはすば歯車の成形"平成14年度塑性加工春期講演会講演論文集. (発表予定). (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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