Sumitomo Electric Hardmetal Corp.

Sumitomo Electric Industries, Limited

Exedy Corporation

Kyocera Document Solutions Inc.

Nissan Motor Company Limited

Tacmina Corporation

Takashi Harada

Satoru Kukino

Naoki Watanobe

Taisuke Higashi

Katsumi Okamura

Akito Ishii

Mayuka Segawa

Hironari Moroguchi

Hideki Hashimoto

Rintaro Sugimoto

Gaku Harada

Keisuke Fujioka

Soichiro Kakinoki

Yuichiro Watanabe

Keita Miyamoto

Masashi Harada

Akihiko Ueda

Yoshinori Tanigawa

Kentaro Chihara

Michitomo Masaki

Souichi Asai

Akihiko Oono

Hiroshi Uehara

Shinya Imamura

Tetsuo Nakai

Tomohiro Fukaya

Machiko Abe

Takayuki Mashimo

Junichi Shiraishi

Masanobu Tanaka

Yasunori Doman

Yoshinari Yoshimura

Toshihiko Tanaka

Akira Shimada

Masaaki Nishihara

Hikaru Miyaji

Takuya Nohara

Hirotsugu Iwasaki

Yukio Shibata

Nobuto Fujita

Shigetomo Ohshitamoto

Michimoto Masaki

Hideki Tomimoto

Cutting tool

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 drill includes a blade tip part that is formed of diamond and a trunk part that is formed of diamond and is continuous with the blade tip part, the drill rotating about a drill axis, the blade tip part includes N cutting edges where N is an integer of no less than 4, and a proportion of Sto Sis no less than 30% and no more than 60%, where Sis an area of the drill in a cross-section with the drill axis as a normal line, the cross-section including a boundary between the blade tip part and the trunk part, r is a maximum value of a distance from the drill axis to an outer edge of the drill in the cross-section and Sis an area of a circle with r as a radius.

Drill

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 diamond coated tool includes a base material and a diamond layer provided on the base material. The diamond layer has a boron content of 1×10ppma or more and 1×10ppma or less and an oxygen content of 1×10ppma or more and 1×10ppma or less in a first region surrounded by a surface of the diamond layer and a first imaginary plane located at a distance of 1 μm from the surface in a thickness direction.

Diamond coated 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 sintered material includes a first material and a second material, wherein the first material is partially stabilized ZrOin which 1 to 90 volume % of AlOis dispersed in crystal grain boundaries or crystal grains, the AlOis a grain having a grain size of less than or equal to 1 μm, and the second material is at least one compound selected from a group consisting of a carbide, a nitride, and a carbonitride, and 5 to 95 volume % of the second material is included in the sintered material.

Sintered material and cutting tool including same

A method of producing a cubic boron nitride sintered material includes: forming an organic cubic boron nitride powder by attaching an organic substance onto a cubic boron nitride source material powder; preparing a powder mixture including more than or equal to 85 volume % and less than 100 volume % of the organic cubic boron nitride powder and a remainder of a binder source material powder by mixing the organic cubic boron nitride powder and the binder source material powder, the binder source material powder including WC, Co and Al; and obtaining the cubic boron nitride sintered material by sintering the powder mixture.

Method of producing cubic boron nitride sintered material, cubic boron nitride sintered material, and cutting tool including cubic boron nitride sintered material

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

Osaka, Japan

Takashi Harada