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1990 Fiscal Year Final Research Report Summary

Thermo-Chemical Wear Mechanism of Ultrafine Diamond Cutting Edge

Research Project

Project/Area Number 01460103
Research Category

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

Allocation TypeSingle-year Grants
Research Field 機械工作
Research InstitutionOsaka University

Principal Investigator

IKAWA Naoya  Osaka University, Department of Precision Engineering, Professor, 工学部, 教授 (60028983)

Co-Investigator(Kenkyū-buntansha) OHMORI Giichi  Osaka University, Department of Precision Engineering, Assistant Professor, 工学部, 講師 (80029040)
SHIMADA Shoichi  Osaka University, Department of Precision Engineering, Associate Professor, 工学部, 助教授 (20029317)
Project Period (FY) 1989 – 1990
KeywordsUltra-precision metal cutting / Diamond tool / Tool wear / Thermo-chemical wear / Thermodynamics / Quantum chemistry / Wear process
Research Abstract

Durability of cutting edge is a common requirement for ultra-precision cutting tool. Because the cutting edge under attritious contact with workmaterial is inevitably subject to elevated temperature, thermo-chemical process is considered to be an essential mechanism on wear of diamond cutting tool. To understand the wear characteristics of cutting edge, the simplified experiments simulating the thermo-chemical process are carried out. On the other hand, based on the thermodynamics and quantum chemistry, the behavior of carbon atom on the surface of diamond specimen is analyzed in terms of binding energy. The results of the experiments and the analysis show that the mechanism of thermoーchemical wear process of diamond is as follows. The adsorption of oxygen atom on diamond surface deteriorate the stable structure or binding of carbon atom on the first layer of diamond crystal. The deterioration is enhanced when a specific metal atom exists near the adsorped oxygen atom due to the interaction between the metal and the oxygen atoms. When the temperature is elevated to the oxidization level of contacting metal, the carbon atoms on the specimen surface are removed as the form of carbon oxide. Therefore, the temperature and oxygen partial pressure of atmosphere are the important factors determining the thermo-chemical wear process of diamond. It is difficult to prevent the wear of cutting edge due to the restriction in realistic condition of atmosphere attainable. However, the application of thermo-chemical process to the high efficiency polishing of diamond can be feasible.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] S. Shimada: "The Scientific Qualification of Diamond as Applied to A Highly Reliable Cutting Tool" Preprints of 5th International Precision Engineering Seminar. 75-85 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 井川 直哉: "ダイヤモンドの強度に対する温度および雰囲気の影響" 1989年度精密工学会秋季大会学術講演会講演論文集. 119-120 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 井川 直哉: "高信頼工具用ダイヤモンド原石の科学的選別法" 1990年度精密工学会春季大会学術講演会講演論文集. 539-540 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 井川 直哉: "熱履歴によるダイヤモンドの強度変化に対する酸素分圧の影響" 精密工学会1990年度関西地方定期学術講演会講演論文集. 25-26 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S. Shimada et al.: "The scientific Qualification of Diamond as Applied to A Highly Reliable Cutting Tool" Preprints of 5th International Precision Engineering Seminar. 75-85 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Ikawa et al.: "Effect of Atmosphere on Diamond Strength" Preprints of 1989 Autumn Meeting of JSPE. 119-120 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Ikawa et al.: "Scientific Qualification of Diamond for Highly Reliable Cutting Tool" Preprints of 1990 Spring Meeting of JSPE. 539-540 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Ikawa et al.: "Effect of Oxygen Partial Pressure to Change in Strength by Heat Treatment" Preprints of 1990 Annual Meeting of JSPE Kansai Branch. 25-26 (1990)

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

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Published: 1993-08-12  

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