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Heat transfer characteristics of cutting tool and workpiece surfaces under cryogenic cooling conditions and optimum supply conditions of coolant

Research Project

Project/Area Number 19K04125
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 18020:Manufacturing and production engineering-related
Research InstitutionTottori University

Principal Investigator

SATO Masahiko  鳥取大学, 工学研究科, 教授 (50244512)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords切削加工 / 温度 / クーラント / 極低温 / 切削 / 低温 / 熱伝達 / 工具摩耗
Outline of Research at the Start

チタン合金やニッケル合金など耐熱金属の切削では工具刃先温度が高くなりやすく,工具摩耗の抑制に対するクーラント技術が重要である.近年,クーラントとして切削液を使用せず,液体窒素噴射環境下での切削の研究が進められている.本研究では,極低温環境下での切削における工具および被削材表層での熱伝達を被冷却物の熱的性質や表面性状に基づいて物性の面から解明し,冷却効率を最大限に高めるような加工条件,噴射供給方法の最適化を図り,環境負荷の小さな新たな機械加工技術の実現を目指す.

Outline of Final Research Achievements

In this study, the heat transfer characteristics of the surface layer of workpiece material and the rake face temperature during cutting were investigated under a cooling condition using cryogenic coolant of liquefied carbon dioxide and liquid nitrogen. The cooling effect of the surface layer of workpiece material is higher for materials with low thermal conductivity. The rake face temperature of cutting tool in the turning of titanium alloy was measured by tool-workpiece thermocouple circuit. The lower the cutting speed and feed rate, the greater the effect on decreasing the average rake face temperature under coolant conditions. The cooling effect was larger at lower cutting speeds than at lower feed rates.

Academic Significance and Societal Importance of the Research Achievements

航空機等に使用される耐熱金属は高融点で低熱伝導率なため切削温度が高く工具摩耗が大きい.このためクーラント技術が重要であるが,切削液は環境汚染や作業者の健康被害など悪影響も多い.液体窒素や液化二酸化炭素による極低温切削では,切削液の廃棄がなく,製品の洗浄工程が省略できるなど利点が大きい.本研究は,極低温切削における工具および被削材表層での熱伝達状態を明らかにし,環境負荷の小さな機械加工技術の実現を目指す点で社会的意義は大きい.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (5 results)

All 2021 2020 2019

All Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Presentation] Effect of cutting speed and feed rate on rake face temperature in cryogenic machining2021

    • Author(s)
      Ahmed Abdalla, Masahiko Sato
    • Organizer
      精密工学会中国四国支部講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] MEASUREMENT OF RAKE FACE TEMPERATURE IN CRYOGENIC MACHINING OF TITANIUM ALLOY2020

    • Author(s)
      Masahiko Sato, Masashi Kamoto
    • Organizer
      Conference on Leading Edge Manufacturing/Materials and Processing, LEMP2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Rake face temperature when machining Ti-6Al-4V under cryogenic carbon dioxide cooling2019

    • Author(s)
      Hikaru Bussho and Masahiko Sato
    • Organizer
      8th International Conference of Asian Society for precision Engineering and Nanotechnology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 低温切削における冷却剤の熱伝達特性とすくい面温度2019

    • Author(s)
      佐藤昌彦,佛生光
    • Organizer
      2019年度精密工学会中国四国支部・九州支部佐世保地方講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] 低温切削における工具すくい面温度計測と熱伝達特性2019

    • Author(s)
      佛生光,佐藤昌彦
    • Organizer
      日本機械学会第13回生産加工・工作機械部門講演会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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