| 摘要 |
PURPOSE:To make it possible to perform high speed cutting and as well the cutting of ultra-hard materials, by constituting a main chip with a rod-like center side chip made of a high-pressure phase sintered member and having a substantially quarter circle cross sectioned shape, and an outer peripheral side chip which is made by sintering and securing a cutting knife layer formed of high-pressure phase sintered member on an ultra-hard alloy substrate. CONSTITUTION:A main cutting knife chip 4 is formed of a rod-like center side chip made of a high-pressure phase sintered material of cubic boron nitride, diamond or the like and having a substantially quarter circle cross-sectioned shape, and an outer peripheral side chip 6 which is made by sintering and securing a cutting knife layer 12 made of a high-pressure phase sintered material, on a substrate 10 made of, for example, ultra-hard alloy. In this case, the cutting face 9 of the center side chip 5 is formed as an arcuated surface or a plurality of stepped surfaces, and the planar cutting face 10 of the outer peripheral side chip 6 is made continuous to the cutting surface 9. With this arrangement, high speed cutting and as well the cutting of ultrahard materials may be made. |
