Effect of Clearance on Punching-Hole Surface Crack Width in the Shearing of Amorphous Electrical Steel Sheets Using a Tool with a Nanometer-Scale Periodic Structure

8 pages•Published: August 6, 2026

Tomomi Shiratori, Nanaka Takahashi, Mitsuaki Ikeda and Tatsuhiko Aizawa

Abstract

Amorphous electrical steel sheets were sheared using a tungsten carbide–cobalt (WC–Co) punch. To suppress crack initiation on the pierced-hole surface, the punch was first subjected to ion sharpening and subsequently laser processed to introduce a nanometer-scale periodic structure. The shearing characteristics were compared with clearance as a parameter. The fracture propagation mechanism was analyzed based on the crack behavior and the load–stroke diagrams. The results showed that the introduction of the nanometer-scale periodic structure and the reduction of the clearance to as small as 1 µm successfully suppressed crack formation, and that clearance is the dominant factor in crack inhibition.

Keyphrases: amorphous electrical steel sheet, clearance, nanometer scale periodic structure, piercing, punching

In: Numpon Mahayotsanun (editor). Proceedings of The 11th International Conference on Tribology in Manufacturing Processes & Advanced Surface Engineering, vol 4, pages 75-82.

Links:	https://easychair.org/publications/paper/pQP6
	https://doi.org/10.29007/jx7z

BibTeX entry

@inproceedings{ICTMP2026:Effect_Clearance_Punching_Hole,
  author    = {Tomomi Shiratori and Nanaka Takahashi and Mitsuaki Ikeda and Tatsuhiko Aizawa},
  title     = {Effect of Clearance on Punching-Hole Surface Crack Width in the Shearing of Amorphous Electrical Steel Sheets Using a Tool with a Nanometer-Scale Periodic Structure},
  booktitle = {Proceedings of The 11th International Conference on Tribology in Manufacturing Processes & Advanced Surface Engineering},
  editor    = {Numpon Mahayotsanun},
  series    = {EPiC Series in Technology},
  volume    = {4},
  publisher = {EasyChair},
  bibsource = {EasyChair, https://easychair.org},
  issn      = {2516-2322},
  url       = {/publications/paper/pQP6},
  doi       = {10.29007/jx7z},
  pages     = {75-82},
  year      = {2026}}

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