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Elucidation of shear deformation mechanism of amorphous electrical steel sheet by punching tool with nano-metric structure

Research Project

Project/Area Number 21K03789
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 InstitutionUniversity of Toyama

Principal Investigator

Tomomi Shiratori  富山大学, 学術研究部工学系, 教授 (80607755)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywordsせん断 / アモルファス電磁鋼板 / クリアランス / ナノメートル周期構造 / イオン先鋭化 / せん断加工 / ナノ周期構造 / C面形状
Outline of Research at the Start

本研究はアモルファス電磁鋼板の多層積層せん断加工における、ダイヤモンド工具へのナノ周期構造付与が、せん断した穴の表面のき裂および変形を抑制するメカニズムの解明に取り組む。ナノ周期構造の有無や工具先端R、工具先端形状の均質性をパラメータとし、せん断進展過程における、被加工材表面のき裂や変形の発生状況の違いを定量化して現象解明を図り、アモルファス電磁鋼板の破壊進展に与えるナノ周期構造の働きを解明する。

Outline of Final Research Achievements

The mechanism that suppresses surface cracking and deformation of the workpiece during multilayer lamination shear processing of amorphous electrical steel sheets was clarified. For the fracture progression of amorphous electrical steel sheets, the clearance is set to 5 μm or less, and by adding a nanometer periodic structure to the side of the punch, the nanometer grooves bite into the workpiece like claws.  It was revealed that the workpiece from being drawn into the die during shearing, thereby suppressing the occurrence of cracks on the surface of the hole.

Academic Significance and Societal Importance of the Research Achievements

高強度脆性材料であるアモルファス電磁鋼板の破壊進展がナノメートルからマイクロメートルサイズの工具刃先やクリアランス設定が主影響因子であることを突き止めた。これにより、高品位で低鉄損なモータ鉄心のせん断加工を可能とする学術的裏付けを得た。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (1 results)

All 2024

All Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] Effects of Micro Tool Edge Shape on Stress Distribution State in Stacked Amorphous Electrical Steel Sheets Shearing.2024

    • Author(s)
      Kentaro Ito,Suguri Huruhata,Tomomi Shiratori, Yohei Suzuki,Tatsuhiko Aizawa
    • Organizer
      WCMNM2024
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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