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Microstructure of Cutting Edge Affecting Minimum Thickness of Cut in Micromachining

Research Project

Project/Area Number 62550097
Research Category

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

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

Principal Investigator

SHIMADA Shoichi  Faculty of Engineering, Osaka University, Assistant Professor, 工学部, 講師 (20029317)

Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1988: ¥400,000 (Direct Cost: ¥400,000)
Keywordsultraprecision metal cutting / minimum thickness of cut / limit in machining accuracy / cutting edge sharpness / microstructure of cutting edge / 切刃稜丸味 / 切刃稜一様性 / 切刃の一様性
Research Abstract

At an extremely small thickness of cut, a transition takes place in chip removal process from stable to unstable. The effective thickness of cut, which is the undeformed thickness of the workmaterial effectively removed by cutting edge from the worksurface, at the transition can be defined as the minimum thickness of cut. The minimum thickness of cut determines the possible limitation of the cutting accuracy attainable. The purpose of the present work is to analyse the effects of microstructure of a diamond cutting edge to minimum thickness of cut. The results obtained in the work are shown as follows.
For the analysis of micromachining phenomena, a special cutting apparatus is designed and built using an air spindle and a hydrostatic slide. It has features of high stiffness, high repeatability in motion and nanometer resolution in infeed mechanism.
Cutting experiments are carried out on the cutting apparatus described above. The results show that the sharpness of cutting edge is the pri … More mary factor which affects the minimum thickness of cut and that the sharper the cutting edge, the smaller the minimum thickness of cut. The uniformity of microstructure over the effective length of cutting edge is also the important factor enabling the stable chip removal. Lack of uniformity in the edge configuration deteriorates the cutting performance in terms of minimum thickness of cut.
Using a two-dimensional finite element method, the initial stage of elastic chip separation process in micromachining is analysed. When the cutting edge with a certain edge radius is indented, the workmaterial on the interface between the tool and the workmaterial tends to separate into two directions, rake face side and flank face side. The separation point on the tool egde changes depending on the thickness of cut and the interaction force between the tool and the workmaterial. By the analysis, the minimum thickness of cut is estimated to be about 0.7 of the radius of the cutting edge sharpness. That ratio tends to incease with the increase of the interaction force between the tool and the workmaterial. Less

Report

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

    (9 results)

All Other

All Publications (9 results)

  • [Publications] N.Ikawa,;S.Shimada,;H.Morooka,: Proc.6th International Conference of Production Engineering. 64-69 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] N.Ikawa,;S.Shimada,;H.Morooka,: Bulletin of Japan Society of Precision Engineering. 21. 233-238 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] N.Ikawa,;S.Shimada,;G.Ohmori,: Proceedings of Ultra-Precision in Manufacturing Engineering. 126-142 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] N.Ikawa; S.Shimada; H.Morooka: "Nano-Performance of Machine Tool Elements" Proc. 6th International Conference of Production Engineering. 64-69 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] N.Ikawa; S.Shimada; H.Morooka: "Technology of Diamond Tool for Ultraprecision Metal Cutting" Bulletin of Japan Society of Precision Engineering. 21. 233-238 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] N.Ikawa; S.Shimada; G.Ohmori: "Recent Trends in Diamond Tool Technology" Proceedings of Ultra-Precision in Manufacturing Engineering. 126-142 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] N.Ikawa;S.Shimada;G.Ohmori: Proceedings of Ultra-Precision in Manufacturing Engineering. 126-142 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] N. Ikawa;S. Shimada;H. Morooka: Bulletin of Precision Engineering. 21. 233-238 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] 島田尚一: ""工具", 加工技術データファイル, 第10巻, 1, 3, 4" 機械技術振興協会技術研究所, 8 (1986)

    • Related Report
      1987 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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