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Direct Observation of the Micro-Plasto-Hydrodynamic Lubrication Mechanism at the Interface between Workpiece and Die by Microscope

Research Project

Project/Area Number 62460083
Research Category

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

Allocation TypeSingle-year Grants
Research Field 機械工作
Research InstitutionYokohama National University

Principal Investigator

KUDO Hideaki  Yokohama National University, Professor, 工学部, 教授 (90017848)

Co-Investigator(Kenkyū-buntansha) TSUBOUCHI Masao  Yokohama National University, Assistant, 工学部, 助手 (20017908)
AZUSHIMA Akira  Yokohama National University, Associate Professor, 工学部, 助教授 (30111462)
Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥7,400,000 (Direct Cost: ¥7,400,000)
Fiscal Year 1988: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1987: ¥6,400,000 (Direct Cost: ¥6,400,000)
Keywordsmicro-plasto-hydrodynamic lubrication / drawing / direct observation / FEM / 封入潤滑油 / 画像処理 / 潤滑油粘度 / 凹部形状変化
Research Abstract

A newly developed sheet drawing experimental apparatus which consists of a transparent die made system of quatrz, amicroscope with a CCD video camera and a video system is used to observe directly the lubricant behavior trapped in the pockets on the workpiece surface. The specimen sheets of aluminum are provided with uniformly destributed pyramidel indentations and drawn at a constant speed with oils having various viscosities. If the oil is completely trapped in the surface pockets, the geometry shows little change, while without oil in the pocket it changes markedly. This indicates that a high hydrostatic pressure is generated in the oil trapped completely in the pocket. From a FEM calculation of an axi-symmetric ypsetting of a cylinder having a central conical impression filling with oil, it is also shown that the hydrostatic pressure in the oil approaches the normal pressure acting on the real contact area at about 5% reduction in height of the cylinder. Moreover, even permeation of the highly pressurized oil in the pocket into the real contact area is directly observed. For the oil having lower viscosities the oil in the pocket permeates forward into the real contact area, and the shape change becomes larger. The oil with higher viscosities is squeezed much more backward than forward. From the above results, the existence of the micro-plastohydrodynamic lubrication mechanism is confirmed.

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] H.Kudo;A.Azushima: Proc. 2nd Intern.Conf.on Technology of Plasticity,Stuttgart. 1. 373-384 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 小豆島明,坪内昌生,工藤英明,古田憲明,峯村憲: 塑性と加工(日本塑性加工学会誌).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Hideaki Kudo; Akira Azushima: "Interaction of Surface Microstructure and Lubricant in Metal Forming Tribology" Proc. 2nd Intern. Conf. on Technology of Plasticity, Stuttgart. 1. 373-384 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Akira Azushima; Masao Tsubouti; Hideaki Kudo; Muneaki Furuta; Ken Minemura: "Direct Confirmation of the Micro-Plasto-Hydrodynamic Lubrication Mechanism at tha Interface between Workpiece and Forming Die" Journal of the Japan Society for Technology of Plasticity.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 小豆島明,坪内昌生,工藤英明,古田憲明,峯村憲: 塑性と加工.

    • Related Report
      1988 Annual Research Report
  • [Publications] H.Kudo: Proc,2nd Intern Conf.on Technology of Plasticity Stuttgart. 1. 373-384 (1987)

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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