Sumitomo Electric Hardmetal Corp.

Sumitomo Electric Industries, Limited

Naoki Watanobe

Satoru Kukino

Takashi Harada

Taisuke Higashi

Katsumi Okamura

Rintaro Sugimoto

Gaku Harada

Hironari Moroguchi

Mayuka Segawa

Hiroki Yonekura

Keita Miyamoto

Soichiro Kakinoki

Yosuke Korogi

Nozomi Tsukihara

Tsutomu Hirano

Makoto Setoyama

Akihiko Ueda

Akito Ishii

Yusuke Matsuda

Masashi Harada

Hirotsugu Iwasaki

Hideki Tomimoto

Cutting tool

There is provided a diamond cutting tool including a cutting edge portion containing single crystal diamond or binderless polycrystalline diamond and graphite, wherein when Raman spectroscopy is performed on a surface of the cutting edge portion, a ratio R1 of Ig1 to a sum of Id1 and the Ig1 is equal to or more than 0.5 and equal to or less than 1, where the Id1 represents a peak intensity of first carbon in the surface, the Ig1 represents a peak intensity of second carbon in the surface, the first carbon represents carbon that forms the single crystal diamond or the binderless polycrystalline diamond.

Diamond cutting tool and method for manufacturing the same

A cubic boron nitride sintered material tool contains a plurality of cBN grains. cBN grains located on a surface of the cutting edge contain a cubic boron nitride phase, and a hexagonal boron nitride phase. When a ratio I/Ibetween an intensity of a π* peak derived from a π bond of hBN in the hexagonal boron nitride phase and an intensity of a σ* peak derived from a σ bond of hBN in the hexagonal boron nitride phase and a σ bond of cBN in the cubic boron nitride phase is determined by measuring an energy loss associated with excitation of K-shell electrons of boron, the ratio I/Iof the cBN grain on the surface of the cutting edge is 0.1 to 2, and the ratio I/Iof the cBN grain at a depth position of 5 μm from the surface of the cutting edge is 0.001 to 0.1.

Cubic boron nitride sintered material tool

A diamond tool includes a diamond at least on a cutting edge includes a diamond phase composed of a diamond crystal structure and a graphite phase composed of a graphite crystal structure. When a ratio I/Ibetween an intensity of a π* peak derived from a π bond of carbon in the graphite phase and an intensity of a σ* peak derived from a σ bond of carbon in the graphite phase and a σ bond of carbon in the diamond phase is determined for the diamond grain by measuring an energy loss associated with excitation of K-shell electrons of carbon by electron energy loss spectroscopy, the ratio I/Iof the diamond grain on a surface of the cutting edge is 0.1 to 2 and a ratio I/Iof the diamond grain at a depth position of 0.5 μm from the surface of the cutting edge is 0.001 to 0.1.

Diamond tool

A cutting tool rotates about a rotation axis, and includes a tip end portion. The tip end portion includes a partially spherical surface that is brought into contact with a workpiece. The surface is provided with a plurality of recesses disposed apart from each other. An opening edge of each of the plurality of recesses constitutes a cutting edge.

A method for manufacturing a cutting tool having a rake face, a flank face, and an edge having a ridge line interconnecting the rake face and the flank face, wherein on the flank face there is a cutting edge region from the ridge line of the edge to a point A away therefrom on the side of the flank face by a distance X, the method comprising producing and processing the flank face with a laser, the producing and processing being producing and processing the cutting edge region along the ridge line of the edge with a first laser beam having a depth of focus equal to or deeper than a width of the cutting edge region when the distance X is the width of the cutting edge region, the distance X being 0.2 mm or more and 5 mm or less.

Method for manufacturing a cutting tool, and the cutting tool

A cutting tool includes: a base metal provided with a seat portion; a blade edge member that is a polycrystalline diamond sintered material containing polycrystalline diamond and a binder; and a brazing material that fixes the blade edge member to the seat portion of the base metal. The blade edge member has a thickness of greater than or equal to 0.3 mm. The brazing material is disposed between a blade edge bottom face of the blade edge member and a seat bottom face of the seat portion and is in contact with the blade edge bottom face and the seat bottom face. The flank face is located outside of the base metal with respect to the lateral face of the base metal.

Cutting tool and method for manufacturing same

A composite sintered material includes: a plurality of diamond grains having an average grain size of less than or equal to 10 μm; a plurality of cubic boron nitride grains having an average grain size of less than or equal to 2 μm; and a plurality of aluminum oxide grains having an average grain size of less than or equal to 0.5 μm; and a remainder of a binder phase, wherein at least parts of adjacent diamond grains are bound to one another, the binder phase includes cobalt, in the composite sintered material, a content of the diamond grains is from 30 to 92 volume %, a content of the cubic boron nitride grains is from 3 to 40 volume %, a content of the aluminum oxide grains is from 2 to 15 volume %, and a content of the cobalt is from 3 to 30 volume %.

Composite sintered material

Growing community of inventors

Itami, Japan

Naoki Watanobe