Cutting Performance of Binder-Less Nano-Polycrystalline cBN Tool

Katsuko Harano; Keiko Arimoto; Yuh Ishida; Hitoshi Sumiya

doi:10.4028/www.scientific.net/AMR.1017.389

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1017Cutting Performance of Binder-Less...

Cutting Performance of Binder-Less Nano-Polycrystalline cBN Tool

Abstract:

Binder-less nanopolycrystalline cBN (BL-PcBN) synthesized by direct conversion under high pressure and high temperature has a fine texture consisting of small cBN grains (<100nm), high hardness (40–50 GPa) and high transverse rupture strength (1.3–1.6 GPa). Their mechanical properties strongly depend on their starting materials and synthetic conditions. In this study, Ball-end mill tools prepared from several kinds of BL-PcBN synthesized under various conditions (8–20 GPa, 1500–2300oC) were examined for precision cutting of high-strength hardened steel comparing with conventional sintered cBN. A fine mirror-finish surface with Ra of 20 nm could be produced by precision BL-PcBN tools, while not by conventional sintered cBN tools. The tool wear of BL-PcBN synthesized from hBN at 10 GPa and 2200°C was four to five times less than that of conventional cBN. These results revealed that the BL-PcBN tools have excellent potential for precision cutting on ferrous materials.

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Periodical:

Advanced Materials Research (Volume 1017)

Pages:

389-392

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1017.389

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Online since:

September 2014

Authors:

Katsuko Harano*, Keiko Arimoto, Yuh Ishida, Hitoshi Sumiya

Keywords:

Ball-End Mill, CBN, Cutting Tool, Direct Conversion, Nanopolycrystal

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