Sumitomo Electric Hardmetal Corp.

Sumitomo Electric Industries, Limited

A.l.m.t. Corporation

Yutaka Kobayashi

Yoshiki Nishibayashi

Akihiko Ueda

Hitoshi Sumiya

Natsuo Tatsumi

Nozomi Tsukihara

Takuya Nohara

Katsuo Kazahaya

Katsuko Yamamoto

Yuichiro Seki

Toshiya Takahashi

Makoto Yukawa

Takuya Kinoshita

Makoto Setoyama

Takeshi Sato

Kazuo Nakamae

Issei Satoh

Kenichi Watatani

Minoru Yoshida

Keiji Fuse

Katsuyuki Tanaka

Keizo Tanaka

Rintaro Sugimoto

Takeru Nakashima

Akito Yoshida

Akira Kobayashi

Naohiro Toda

Ryo Toyoshima

Minori Teramoto

Katsuyuki Kawate

Mamoru Ono

Bunya Suemitsu

Hiroyuki Murase

Teruhiro Enami

Shigetoshi Sumimoto

Kohichiroh Kimura

Kohei Kuramoto

Kentaro Shiro

Toshimitsu Sakata

A wire drawing dieincludes a non-diamond material, is provided with a die hole, and has a reductionand a bearingthat is positioned downstream of the reduction. A reduction angle γ which is an opening angle of the die holeat the reductionis less than or equal to 17°, and a surface roughness Ra of the die holewithin ±20 μm from a specific position inside the bearingin a circumferential direction of the die holethat is perpendicular to a wire drawing direction is less than or equal to 0.025 μm.

Wire drawing die

Provided is a synthetic single-crystal diamond containing nitrogen. In an X-ray absorption fine structure thereof, a ratio I/Ibetween an intensity Iof a peak which appears at an energy of 405±1 eV and has a full width at ¾ maximum of 3 eV or more and an intensity Iof a peak which appears at an energy of 412±2 eV is less than 1.5.

Synthetic single crystal diamond, tool including the same and method of producing synthetic single crystal diamond

A single-crystal diamond includes n types of regions different in total concentration of an impurity, the n types of regions being observed in an observed surface being in parallel to a (110) face. Each of the n types of regions has an area not smaller than 0.1 μm. At least one of a first line, a second line, and a third line on the observed surface crosses a boundary between the n types of regions at least four times. The first line, the second line, and the third line are in parallel to a <−110> direction and have a length of 1 mm. A midpoint of the first line corresponds to the center of gravity of the observed surface. The second line and the third line are distant from the first line by 300 μm in a <001> direction and a <00−1> direction, respectively.

Single-crystal diamond and method of manufacturing the same

A turning tool includes: a holder portion; and a cutting edge portion fixed to the holder portion, wherein the cutting edge portion is composed of a synthetic single-crystal diamond, and the cutting edge portion has a nose curvature having a curvature radius of more than or equal to 0.1 mm and less than or equal to 1.2 mm, and the nose curvature satisfies at least one of a condition that a direction of a line of intersection between the rake face and a bisecting cross section of a vertex angle of the nose curvature is within ±10° relative to a <110> direction of the synthetic single-crystal diamond, and a condition that the direction of the line of intersection between the rake face and the bisecting cross section of the vertex angle of the nose curvature is within ±10° relative to a <100> direction of the synthetic single-crystal diamond.

Turning tool

A cutting tool includes a substrate and a diamond layer that covers the substrate. The diamond layer includes a rake face and a flank continuous to the rake face. A ridgeline between the rake face and the flank forms a cutting edge. The substrate includes a top surface opposed to the rake face. When viewed in a direction perpendicular to the top surface, the rake face includes a plurality of protrusions. In a cross-section perpendicular to a direction of extension of the cutting edge, each of the plurality of protrusions includes an inclined portion and a curvature portion continuous to the inclined portion. In the cross-section, a height of the inclined portion in the direction perpendicular to the top surface increases as a distance from the cutting edge increases.

Cutting tool and method of manufacturing the same

A rotary cutting tool includes a main body and a shank. The main body has a tip end. The shank is continuous with the main body on the side opposite to the tip end. The main body is provided with a first cutting edge having a positive twist angle, and a second cutting edge having a negative twist angle and separated from the first cutting edge. Each of the first cutting edge and the second cutting edge extends continuously from the tip end to the shank.

Rotary cutting tool

A cutting tool includes: a rake face; a flank face continuous to the rake face; and a cutting edge formed by a ridgeline between the rake face and the flank face. The cutting tool includes: a base material having a first face on a side of the rake face and a second face on a side of the flank face; and a diamond layer covering the first face and the second face. The first face includes: a first top face continuous to the second face; and a second top face continuous to the first top face and disposed such that the first top face is sandwiched between the second top face and the second face. An angle formed between the first top face and the second top face is a negative angle in a cross section perpendicular to the cutting edge.

Cutting tool

A diamond-coated tool includes: a substrate; and a diamond layer that coats the substrate, wherein the diamond layer includes a first region that is in contact with the substrate, the first region includes a region Ssurrounded by an interface P between the substrate and the diamond layer and an imaginary plane Vseparated from the interface P by a distance of 2 &#x3bc;m, and the region Shas crystal grains grown in random directions.

Diamond-coated tool

Provided is a surface-coated cutting tool including a base material and a coating including a super-multilayer-structure layer where A layers and B layers different from the A layers in composition are alternately laminated. The super-multilayer-structure layer includes an X area and a Y area those are alternately repeated. In the X area, A layers having a thickness Aand B layers having a thickness Bare alternately laminated. In the Y area, A layers having a thickness Aand B layers having a thickness Bare alternately laminated. The thickness Ais larger than the thickness A, and the thickness Bis smaller than the thickness B. Each of the A layers and the B layers comprising one or more elements selected from a group consisting of Ti, Al, Cr, Si, Ta, Nb, and W, and one or more elements selected from a group consisting of C and N.

Surface-coated cutting tool

A diamond die includes a diamond provided with a hole for drawing a wire material, the diamond being a CVD single-crystal diamond, an axis of the hole being inclined relative to a normal direction of a crystal plane of the diamond.

Diamond die

A rotary cutting tool includes a base material, a first diamond layer, and a second diamond layer. The base material includes a head portion, a body portion, and a shoulder portion defining a boundary portion between the head portion and the body portion. The first diamond layer covers the body portion and the shoulder portion and exposes the head portion. The second diamond layer covers the head portion, is provided on the first diamond layer in the shoulder portion, and does not cover the body portion.

Rotary cutting tool and method of manufacturing the same

A cutting tool according to one aspect of the present disclosure includes a substrate and a diamond layer coating the substrate. A cutting tool according to one aspect of the present disclosure includes a rake face, a flank contiguous to the rake face, and a cutting edge configured by a ridge formed by the rake face and the flank. The rake face has a first rake face and a second rake face located between the first rake face and the flank. The second rake face and a surface of the substrate located on the side of the rake face form a negative angle. The second rake face is formed at the diamond layer.

In a single-crystal diamond material, a concentration of non-substitutional nitrogen atoms is not more than 200 ppm, a concentration of substitutional nitrogen atoms is lower than the concentration of the non-substitutional nitrogen atoms, and the single-crystal diamond material has a crystal growth main surface having an off angle of not more than 20&#xb0;. A perforated tool includes a single-crystal diamond die, wherein in the single-crystal diamond die, a concentration of non-substitutional nitrogen atoms is not more than 200 ppm, a concentration of substitutional nitrogen atoms is lower than the concentration of the non-substitutional nitrogen atoms, and the single-crystal diamond die has a low-index plane represented by a Miller index of not less than &#x2212;5 and not more than 5 in an integer, a perpendicular line of the low-index plane having an off angle of not more than 20&#xb0; relative to an orientation of a hole for wire drawing.

Single-crystal diamond material, single-crystal diamond chip, and perforated tool

Provided is a method for manufacturing a single-crystal diamond, the method including the steps of: forming a protective film on at least a part of a surface of an auxiliary plate; preparing a diamond seed crystal substrate; disposing an auxiliary plate with a protective film that has the protective film formed on the auxiliary plate, and a diamond seed crystal substrate in a chamber; and growing a single-crystal diamond on a principal surface of the diamond seed crystal substrate by a chemical vapor deposition method while introducing a carbon-containing gas into the chamber.

Single-crystal diamond, method for manufacturing single-crystal diamond, and chemical vapor deposition device used in same

A single-crystal diamond material has a transmittance of light with a wavelength of greater than or equal to 410 nm and less than or equal to 750 nm of less than or equal to 15% for any wavelength, and is at least either of an electrical insulator according to optical evaluation and an electrical insulator according to electrical evaluation. A criterion of the optical evaluation can be a transmittance of light with a wavelength of 10.6 &#x3bc;m of greater than or equal to 1%. A criterion of the electrical evaluation can be an average resistivity of greater than or equal to 1&#xd7;10&#x3a9;cm. Accordingly, a single-crystal diamond material having a low transmittance of light in the entire region of the visible light region and exhibiting a black color is provided.

Growing community of inventors

Itami, Japan

Yutaka Kobayashi