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Suppression of chatter vibrations during milling process with end-mill by using hybrid spindle system with ball and electromagnetic bearings

Research Project

Project/Area Number 18K03878
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 InstitutionKagoshima University

Principal Investigator

KONDO Eiji  鹿児島大学, 理工学域工学系, 教授 (10183352)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywordsびびり振動抑制 / 小径エンドミル / 動的コンプライアンス / ハイブリッド主軸 / 制御磁気軸受 / コンプライアンス / エンドミル加工 / びびり振動 / 主軸 / ころがり軸受 / 磁気軸受
Outline of Final Research Achievements

TThe purpose of this study is to suppress chatter vibrations occurred in the end milling process with a long and small end mill by reducing the peak value of the real part of dynamic compliance at a cutting point, which is controlled by a hybrid spindle system. The spindle of the hybrid spindle system is supported with the rolling bearing at the rear end and the active electromagnetic bearing at the front end. The tool holder with an active electromagnetic bearing attached is used as a prototype hybrid spindle system. It was demonstrated by the impact test that the peak value of the real part of dynamic compliance of the end mill at the natural frequency of the second mode of the prototype hybrid spindle with an end mill was reduced to less than one-third times by the state feedback control. The state feedback coefficients were determined by using analysis for pole assignment of a control system. Furthermore, it was demonstrated in the cutting test that the stability limit increased.

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的背景はエンドミル加工におけるびびり振動の発生であり、ハイブリッド主軸を用い、制御磁気軸受により細長い小径エンドミル工具のびびり振動を抑制することができないか、というのが研究課題の核心をなす学問的「問い」である。本研究で導入するハイブリッド主軸は、旋盤などの他の工作機械への適用が可能であり、工作機械の主軸の設計方法にイノベーションをもたらすことが期待できる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (5 results)

All 2020 2019 2018

All Presentation (2 results) (of which Int'l Joint Research: 2 results) Patent(Industrial Property Rights) (3 results)

  • [Presentation] Control of dynamic compliance at cutting point of small and long end mill aiming suppression of chatter by hybrid spindle system with rolling and active electromagnetic bearings2019

    • Author(s)
      Eiji Kondo
    • Organizer
      Proceedings of the 19th international Conference of the European Society for Precision Engineering and Nanotechnology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Feasibility study of hybrid spindle system with ball and electromagnetic bearings for suppression of chatter vibrations during milling with a small end mill2018

    • Author(s)
      Eiji Kondo
    • Organizer
      Proceedings of the 18th international Conference of the European Society for Precision Engineering and Nanotechnology
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Patent(Industrial Property Rights)] 磁気軸受けユニット 及び制御パラメータ決定方法2020

    • Inventor(s)
      近藤英二
    • Industrial Property Rights Holder
      近藤英二
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2020-097347
    • Filing Date
      2020
    • Related Report
      2020 Annual Research Report
  • [Patent(Industrial Property Rights)] 工作機械の主軸システム2019

    • Inventor(s)
      近藤英二
    • Industrial Property Rights Holder
      近藤英二
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2019-184754
    • Filing Date
      2019
    • Related Report
      2019 Research-status Report
  • [Patent(Industrial Property Rights)] 主軸装置2018

    • Inventor(s)
      近藤英二、尾田光成
    • Industrial Property Rights Holder
      近藤英二、尾田光成
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2018-106442
    • Filing Date
      2018
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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