Abstract
Femtosecond laser trimming procedure was optimized to reduce the edge curvature of diamond-coated WC (Co) punch as possible and to decrease the maximum roughness of diamond coatings. Bare diamond-coated WC (Co) punches with normal grain size were prepared to have an original film thickness of 9 μm. Through two laser machining steps, the edge width of diamond coating was reduced down to 2 μm. By using the core die with the clearance of 4%, fine piercing experiments were performed to measure the load–stroke relationship and to describe the affected zone formation by shearing. The affected zone area as well as the fractured surface ratio significantly decreased with a reduction of the edge width down to 2 μm.
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Acknowledgments
The authors would like to express their gratitude to Mr. Y. Suzuki, Mr. T. Yoshino, Mr. T. Aihara (Komatsu-Seiki Kosakusho, Co., Ltd.), and Mr. T. Inohara (LPS-Works, Co., Ltd.) for their help in experiments. This study was financially supported in part by the METI-project on the Supporting Industry Program in 2019.
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Aizawa, T., Shiratori, T. (2021). Fine-Piercing of Electrical Steel Sheets by Edge-Sharpened Diamond Punch. In: Daehn, G., Cao, J., Kinsey, B., Tekkaya, E., Vivek, A., Yoshida, Y. (eds) Forming the Future. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-75381-8_233
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DOI: https://doi.org/10.1007/978-3-030-75381-8_233
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