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1995 Fiscal Year Final Research Report Summary

Molecular Dynamics Analysis of Mechanical Surface Generation Process at Atomistic Level

Research Project

Project/Area Number 05402030
Research Category

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

Allocation TypeSingle-year Grants
Research Field 機械工作・生産工学
Research InstitutionOsaka University

Principal Investigator

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

Co-Investigator(Kenkyū-buntansha) UCHIKOSHI Junichi  Osaka Univeristy, Department of Precision Engineering, Research Associate, 工学部, 助手 (90273581)
SHIMADA Shoichi  Osaka Univeristy, Department of Precision Engineering Associate Professor, 工学部, 助教授 (20029317)
Project Period (FY) 1993 – 1995
KeywordsMicromachining / Diamond turning / Computer simulation / Cutting mechanism / Machining accuracy / Molecular dynamics / Cutting temperature
Research Abstract

To understand the chip removal and surface generation mechanisms and for the quest of ultimate accuracy attainable in micromachining of metals, a feasibility study is proposed based on molecular dynamics (MD) computer simulation. MD simulation is confirmed to be a useful method to analyze accurately the atomistic behavior of the workmaterial around the cutting edge in cutting process.
Due to plowing of the cutting edge, many dislocations are generated successively in the workpiece near the tool-workpiece interface. Some of them move into the shear zone and disappear from the free surface. As a result of succesive generation and disappearance of the dislocations, the chip seems to be removed stably. The other dislocations penetrated into the workpiece beneath the cutting edge move back and finally disappear from the worksurface due to spring back of the workpiece after the passage of the cutting edge. As a result of the relaxation, atomistic steps are formed on the worksurface. The hight … More of the steps remaining on the worksurface can be considered as the ultimate surface roughness attainable in microcutting.
Apart from machine tool performance, there are two primary factors affecting the ultimate accuracy attainable in micromachining. One is the minimum thickness of cut (MTC), which is the minimum uncut chip thickness stably removed from a worksurface at a cutting edge. The other is transfer fidelity of the cutting edge profile to the worksurface, which is of the same level as the ultimate surface roughness. MD simulations show that MTC and transfer fidelity in microcutting of copper is 1/20 to 1/10 of the radius of the cutting edge, that is about 1 nm for a realistic diamond cutting tool, and about 1.0 nm, respectively. In cutting of aluminum, a larger MTC and transfer fidelity, which are 1/10 to 1/5 and 2.0 nm, are estimated.
By the introduction of a kind of "scaling" in thermal conductivity for which electron conduction is to be taken into account, the cutting temperature in microcutting can be reasonably analyzed. Less

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 井川直哉,他: "極微小切削における切くず形態と最小切取り厚さ" 精密工学会誌. 59,4. 673-679 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S. Shimada, et al.: "Feasibikity Study on Ultimate Accuracy in Microcutting Using Molecular Dynamics Simulation" Annals of the CIRP. 42, 1. 91-94 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 島田尚一,他: "分子動力学を用いた極微小切削における切削力および切りくず生成機構の解析" 精密工学会誌. 59,12. 2015-2021 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S. Shimada, et al.: "Structure of Micromachined Surface Simulated by Molecular Dynamics Analysis" Annals of the CIRP. 43, 1. 51-54 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S. Shimada, et al.: "Brittle-Ductile Transition Phenomena in Microindentation and Micromachining" Annals of the CIRP. 44, 1. 523-526 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S. Shimada, et al.: "Molecular Dynamics Modeling of Thermal Conduction of Metals" Proc. 1995 ASPE Annual Meeting. 21-21 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Ikawa, S.Shimada, R.R.Donaldson, C.K.Syn, J.S.Taylor, G.Ohmori, H.Tanaka, H.Yoshinaga: "Chip Morphology and Minimum Thickness of Cut in Micromachining" J.JSPE. 59,4 (in Japanese). 673-679 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Shimada, N.Ikawa, H.Tanaka, G.Ohmori, J.Uchikoshi, H.Yoshinaga: "Feasibility Study in Ultimate Accuracy in Microcutting Using Molecular Dynamics Simulation" Annals of the CIRP. 42,1. 91-94 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Shimada, N.Ikawa, H.Tanaka, G.Ohmori, J.Uchikoshi: "Molecular Dynamics Analysis of Cutting Force and Chip Formation Process in Microcutting" J.JSPE. 59,12(in Japanese). 2015-2021 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Shimada, N.Ikawa, H.Tanaka, J.Uchikoshi: "Structure of Micromachined Surface Simulated by Molecular Dynamics Analysis" Annals of the CIRP. 43,1. 51-54 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Shimada, R.Inoue, J.Uchikoshi, N.Ikawa: "Molecular Dynamics Analysis on Microstructure of Diamond Turned Surface" Proc.SPIE. 2576. 396-405 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Shimada, N.Ikawa, T.Inamura, N.Takezawa, H.Ohmori, T.Sata: "Brittle-Ductile Transition Phenomena in Microindentation and Micromachining" Annals of the CIRP. 44,1. 523-526 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Shimada, N.Ikawa, R.Inoue, J.Uchikoshi: "Molecular Dynamics Modeling of Thermal Conduction in Microcutting of Metals" Proc.1995 ASPE Annual Meeting, Austin. 21-24 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Shimada: "Molecular Dynamics Analysis of Nanometric Cutting Process" Int.J.Japan Soc.prec.Eng.29,4. 283-286 (1995)

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

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Published: 1997-03-04  

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