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Effect of Machine Stiffness on Cutting Performance

Research Project

Project/Area Number 02555132
Research Category

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

Allocation TypeSingle-year Grants
Research Field 資源開発工学
Research InstitutionThe University of Tokyo

Principal Investigator

NISHIMATSU Yuichi  The University of Tokyo, Faculty of Eng., Professor, 工学部, 教授 (70010741)

Co-Investigator(Kenkyū-buntansha) AKIYAMA Masao  The University of Tokyo, Faculty of Eng., Assistant, 工学部, 助手 (00011172)
OKUBO Seisuke  The University of Tokyo, Faculty of Eng., Associate Professor, 工学部, 助教授 (90092155)
西沢 泉  東京大学, 工学部, 助手 (70198456)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥7,800,000 (Direct Cost: ¥7,800,000)
Fiscal Year 1991: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1990: ¥6,400,000 (Direct Cost: ¥6,400,000)
KeywordsRock / Point Attack Bit / Machine Stiffness / Cutting Force / Fracture Mechanics / Numerical Simulation / 切削 / 剛性
Research Abstract

The cutting characteristics of a point attack bit, especially the effects of cutting speed and depth of cut on cutting force were investigated. Point attack bits are becoming more popular as a cutting tool for boomheader, but its performances are still open to discussion. A series of rock cutting experiments were conducted with various cutting depths and speeds.
It was found that the horizontal component of cutting force increases linearly with cutting depth. This simple relation is true all for the mean, the mean peak and the peak values. It was also found that the build-up nose develops on the clearance face of the bit when a hard andesite is cut at higher cutting speed. As a result, cutting force, especially its vertical component, increases considerably with cutting speed.
The effects of cutting machine stiffness are discussed. Machine stiffness is regarded as one of the important factors in rock cutting, but its effects on cutting performance have scarcely been studied. In this study, a test rig with variable stiffness was designed and manufactured with which a series of cutting experiments were performed.
It was iound that the horizontal-vertical (cross) component of compliance matrix has significant importance. If it is negative, the vertical component of cutting force increases and decreases harmonically with the horizontal component during a cutting process. If positive, however, the vertical component increases when the horizontal component decreases, and vice versa. It was also found that machine stiffness has effects on the mean, the mean peak and the maximum values of cutting force. The mean peak and the maximum values increase with stiffness against the force parallel to the bit axis, that is, stiffness corresponding to the sum of the cross and the vertical components of stiffness.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 西澤 泉: "ポイントアタックビットの切削抵抗に対する切込深さと切削速度の影響" (社)資源・素材学会 研究・業績発表講演会講演要旨集. 369-370 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 西澤 泉: "ポイントアタックビットの切削抵抗" 資源・素材学会誌. 107. 859-864 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Izumi Nishizawa: "Effects of Cutting Depth and Speed on Cutting Force by Point Attack Bit" Proc. MMIJ Spring Meeting. 369-370 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Izumi Nishizawa: "Cutting Force of Point Attack Bit" J. MMIJ. 107. 859-864 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 西澤 泉: "ポイントアタックビットの切削抵抗に対する切込深さと切削速度の影響" (社)資源・素材学会研究・業績発表講演会講演要旨集. 369-370 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 西澤 泉: "ポイントアタックビットの切削抵抗" 資源・素材学会誌. 107. 859-864 (1991)

    • Related Report
      1991 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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