Evaluation Method of Work Materials Adhering onto Cutting-Tool Face by Intermittent Turning

• Project/Area Number: 15K05727
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Production engineering/Processing studies
• Research Institution: Hiroshima University
• Principal Investigator: Katuhiko Sekiya 広島大学, 工学研究科, 助教 (80226662)
• Project Period (FY): 2015-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2016: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2015: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
• Keywords: 構成刃先 / 切削加工 / 凝着 / 炭素鋼 / オーステナイト系ステンレス鋼 / 切削工具 / 中炭素鋼 / ニッケル基耐熱合金

Outline of Final Research Achievements

A new method for observation of work material adhering onto cutting-tool face is proposed in order to clarify the chip generation mechanism. A three-quarter cylindrical bar was cut on an engine lathe, and chips were collected. The end of the chips and their cross sections were observed. This method was simpler than the conventional method with quick-stop devices. This study revealed that build-up edges still remained at the cutting speeds higher than those are expected by many researchers in metal cutting field.

Academic Significance and Societal Importance of the Research Achievements

構成刃先（工具上に堆積した被加工材料が工具切れ刃に代わって切りくずを生成させる）は不安定な切削挙動を示し，このため加工後の表面品位が劣ると多くの切削加工に関する教科書には記載されている．しかしながら本研究の結果，表面品位が良好な場合でも構成刃先は消失せずに安定した形状や大きさを保っており，これらが大きく変動した場合に表面品位が劣化することがわかった．このことは，切りくず生成メカニズムにおいて構成刃先が主体的に機能していることを示しており，従来構成刃先は無いものとして考えられてきた切削メカニズムを修正する必要があることを示唆している．

Research Products

• [Presentation] Observation of Built-up-edges at the End of Chips (2018)
  • Author(s): Katsuhiko SEKIYA, Ryutaro TANAKA and Keiji YAMADA
  • Organizer: 7th International Conference on Precision Engineering
  • Int'l Joint Research
• [Presentation] SUS304旋削時の凝着と仕上げ面 (2018)
  • Author(s): 関谷克彦
  • Organizer: 精密工学会難削材加工専門委員会
• [Presentation] SUS304断続旋削時における切削モードが凝着物の安定性に与える影響 (2017)
  • Author(s): 関谷克彦
  • Organizer: 精密工学会切削加工専門委員会ワークショップ
• [Presentation] SUS304旋削時に生じる凝着（コーティング工具を用いた場合） (2016)
  • Author(s): 關谷克彦，渡辺祥央，田邊翔希，山田啓司
  • Organizer: 日本機械学会 第11回生産加工・工作機械部門講演会
  • Place of Presentation: 名古屋大学東山キャンパス
  • Year and Date: 2016-10-22
• [Presentation] SUS304断続切削時における切削モードが;凝着物の安定性に与える影響 (2016)
  • Author(s): 田邊翔希，關谷克彦，渡辺祥央，田中隆太郎，山田啓司
  • Organizer: 日本機械学会 第11回生産加工・工作機械部門講演会
  • Place of Presentation: 名古屋大学東山キャンパス
  • Year and Date: 2016-10-22
• [Presentation] Stability of the Work Material Adhering to the Cutting Edge in Interrupted Turning of an Austenitic Stainless Steel (2016)
  • Author(s): Katsuhiko Sekiya, Sachio Watanabe, Keiji Yamada
  • Organizer: The 19th International Symposium on Advances of Abrasive Technology
  • Place of Presentation: Stockholmn, Sweden
  • Year and Date: 2016-10-02
  • Int'l Joint Research
• [Presentation] Stability of the work material adhering to the cutting edge in interrupted turning of an austenitic stainless steel (2016)
  • Author(s): K. Sekiya, S. Watanabe, and K. Yamada
  • Organizer: The 19th International Symposium on Advances in Abrassive Technology
  • Place of Presentation: Marriot Courtyard, Stockholm, Sweden
  • Year and Date: 2016-10-02
  • Int'l Joint Research
• [Presentation] 凝着が生じやすい材料の仕上げ面 -SUS304の旋削加工- (2016)
  • Author(s): 關谷克彦
  • Organizer: 精密工学会 切削加工専門委員会ワークショップ
  • Place of Presentation: 山形県高度技術研究開発センター