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Effect of Tool Edge Geometry on Sheared Surface Formation in Blanking of Oxygen-Free Copper

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Abstract:

An oxygen-free copper has been utilized as a terminal material in the power transistors and their related electric system in the electric mobiles because of its high electric conductivity and excellent engineering durability in high current usage. The high ductility and its low mechanical strength cause large shear droop and increase of fractured surface. In this report, the shearing of oxygen-free copper was carried out using a punch with a mirror-finished surface roughness. Using the punch tip deflection as a parameter, a comparison of shearing characteristics was made between a punch with a nitrided tool surface and an untreated punch. The influence on the formation of the sheared surface was considered from an investigation of the shearing characteristics. When shearing oxygen-free copper with a thickness of 500 µm, it was shown that by providing a punch tip deflection of approximately one-tenth of the thickness in the punch stroke direction, the shear droop could be kept to 10 % or less of the plate thickness and a burnished surface ratio was approximately kept 90 %.

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Periodical:

Solid State Phenomena (Volume 388)

Pages:

113-120

DOI:

https://doi.org/10.4028/p-kfL1XM

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Cite this paper

Online since:

April 2026

Authors:

Tomomi Shiratori*, Yuta Ichiyanagi, Kaname Watanabe, Aizawa Tatsuhiko

Keywords:

Blanking, Oxygen-Free Copper, Punching, Tool Edge

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Creative Commons CC BY 4.0

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* - Corresponding Author

References

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