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

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03789
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18020:Manufacturing and production engineering-related
• Research Institution: University 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
• 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

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.

Free Research Field

ナノマイクロ加工

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。