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1994 Fiscal Year Final Research Report Summary

Study on Forming of Hollow Sections of Copper and Copper Alloys by MULTI-BILLET EXTRUSION Method

Research Project

Project/Area Number 05452288
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Material processing/treatments
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

XIE Jian-xin  Tohoku University, Faculty of Eng., Associate Professor, 工学部, 助教授 (80235697)

Co-Investigator(Kenkyū-buntansha) MURAKAMI Tadasu  Tohoku University, Faculty of Eng., Associate Professor, 工学部, 助教授 (90005447)
IKEDA Keisuke  Tohoku University, Faculty of Eng., Professor, 工学部, 教授 (40005921)
Project Period (FY) 1993 – 1994
Keywordsextrusion / multi-billet / hollow section / metal forming / new forming method / copper alloy / numerical simulation / die design
Research Abstract

To confirm the practicality of the Multi-Billet Extrusion method, fabrication of hollow sections of copper (C1100) and copper alloys (C2600, C3771) has been attempted with four-billet extrusion. Six kinds of sections were extruded at 750゚C for C1100 and C2600 and at 700゚C for C3771 in argon atmosphere. The argon atmosphere was supplied to guard against the production of the oxide film on the billet surface resulted from heating, because the thick oxide film is harmful to solid-state welding during extrusion, which is known from early investigation. The welded state of extrudates was evaluated by the expansion test as well as the observations on the welded portions by optical microscopy and on the welded interface by SEM.In most cases, the expanding crack occurs at non-welded portion of extrudates. The expanding ratio, PSI is greater than 1.65 for C1100 extrudates and 1.30 for C2600 extrudates in as-extruded state. For C3771 extrudates, PSI is greater than 1.20 in as-extruded and 1.35 in annealed state. All the expanding ratios are greater than the JIS standard values for seamless pipes of copper or copper alloys. The welded seams of billets on cross-sections of extrudates are invisible in optical microstructure. Even for the cases in which the expanding crack occurs at the welded portion, a large number of dimples exist and only a small amount oxide particles are observed in the fracture surface through SEM observation. The Multi-Billet Extrusion method is feasible for forming hollow sections of copper and copper alloys.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 謝 建新,村上 糺,高橋裕男,池田圭介: "多素材押出し法によるパイプ成形のエネルギー法解析" 塑性と加工. 34. 823-829 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 池田圭介,村上 糺,謝 建新,高久健一,高橋裕男: "熱間多素材押出し法によるC3771パイプの成形" 伸銅技術研究会誌. 32. 202-210 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 謝 建新,池田圭介,村上 糺: "多素材押出し法による銅および銅合金異形中空品の成形" 伸銅技術研究会誌. 34(掲載予定). (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.X.Xie, T.Murakami, H.Takahashi and K.Ikeda: "Theoretical Analysis on Fabrication Process of Pipe by Multi-Billet Extrution" J.Japan Soci. for Tech. of Plasticity. Vol. 34, No390. 823-829 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ikeda, T.Murakami, J.X.Xie, K.Takaku and H.Takahashi: "Fabrication of C3771 Pipes by Hot Multi-Billet Extrusion Method" J.Japan Copper Brass Research Asso.Vol. 32. 202-210 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.X.Xie, K.Ikeda and T.Murakami: "Fabrication of Hollow Sections of Copper and Copper Alloys by Multi-Billet Extrusion Method" J.Japan Copper Brass Research Asso.Vol. 34, (to be published). (1995)

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

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Published: 1996-04-15  

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