Patents by Inventor Daiji Tabayashi
Daiji Tabayashi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230150035Abstract: Provided is a cutting tool that can have a long tool life even when used to cut soft metals in particular. The cutting tool comprises a base body and a hard carbon film arranged on the base body, the hard carbon film includes an amorphous phase and a graphite phase, the density of the hard carbon film is no less than 2.5 g/cm3 and no more than 3.5 g/cm3, the degree of crystallinity of the hard carbon film is no more than 6.5%, and the average coordination number of the amorphous phase is no less than 2.5 and no more than 4.Type: ApplicationFiled: April 24, 2020Publication date: May 18, 2023Applicants: Sumitomo Electric Hardmetal Corp., Sumitomo Electric Industries, Ltd.Inventors: Haruyo FUKUI, Daiji TABAYASHI, Yoshihiro SAITO, Kazuya TOKUDA, Yoshiharu UTSUMI, Hajime TAKAMATSU
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Publication number: 20230123968Abstract: Provided is a cutting tool comprising a base body and a hard carbon film arranged on the base body, in which, when the cross section of the hard carbon film is observed using a high angle annular dark field scanning transmission electron microscope, the area proportion of black regions with an equivalent circle diameter of 10 nm or more is 0.7% or less, and the hard carbon film has a hydrogen content of 5 atom% or less.Type: ApplicationFiled: April 24, 2020Publication date: April 20, 2023Applicant: Sumitomo Electric Hardmetal Corp.Inventors: Daiji TABAYASHI, Haruyo FUKUI, Yoshiharu UTSUMI, Hajime TAKAMATSU
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Publication number: 20230068515Abstract: Provided is a cutting tool comprising a base body and a hard carbon film arranged on the base body, in which the hard carbon film includes an amorphous phase and a graphite phase, the degree of crystallinity of the hard carbon film is no more than 6.5%, and the degree of orientation of the graphite phase is no more than 6.Type: ApplicationFiled: April 24, 2020Publication date: March 2, 2023Applicants: Sumitomo Electric Hardmetal Corp., Sumitomo Electric Industries, Ltd.Inventors: Daiji TABAYASHI, Haruyo FUKUI, Yoshihiro SAITO, Kazuya TOKUDA, Yoshiharu UTSUMI, Hajime TAKAMATSU
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Patent number: 11332810Abstract: A cemented carbide comprises a first hard phase comprising tungsten carbide particles and a binder phase including Co and Cr. In any surface or any cross section of the cemented carbide, a region in which there is a distance X of 5 nm or less between surfaces respectively of tungsten carbide particles adjacent to each other, with the surfaces facing each other along a length L of 100 nm or more, is referred to as a WC/WC interface, and a ratio C(R)/C(C) has an average value of 0.17 or more, where C(R) and C(C) represent peak values of atomic percentages of Cr and Co, respectively, at a WC/WC interface having a distance X of 1 nm or more and 5 nm or less and having therein an atomic percentage of Co higher than an average value of atomic percentages of Co in the tungsten carbide particles+2 at %.Type: GrantFiled: July 31, 2018Date of Patent: May 17, 2022Assignee: SUMITOMO ELECTRIC HARDMETAL CORP.Inventors: Yasuki Kido, Daiji Tabayashi, Shinya Imamura
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Publication number: 20210079504Abstract: A cemented carbide comprises a first hard phase comprising tungsten carbide particles and a binder phase including Co and Cr. In any surface or any cross section of the cemented carbide, a region in which there is a distance X of 5 nm or less between surfaces respectively of tungsten carbide particles adjacent to each other, with the surfaces facing each other along a length L of 100 nm or more, is referred to as a WC/WC interface, and a ratio C(R)/C(C) has an average value of 0.17 or more, where C(R) and C(C) represent peak values of atomic percentages of Cr and Co, respectively, at a WC/WC interface having a distance X of 1 nm or more and 5 nm or less and having therein an atomic percentage of Co higher than an average value of atomic percentages of Co in the tungsten carbide particles+2 at %.Type: ApplicationFiled: July 31, 2018Publication date: March 18, 2021Applicant: SUMITOMO ELECTRIC HARDMETAL CORP.Inventors: Yasuki KIDO, Daiji TABAYASHI, Shinya IMAMURA
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Patent number: 10745783Abstract: A cemented carbide comprising a first hard phase composed of tungsten carbide particles and a binder phase including Co, the cemented carbide having a ratio Nt/Na of 0.9 or more, where, in any surface or any cross section of the cemented carbide, a region in which there is a distance X of 5 nm or less between surfaces respectively of tungsten carbide particles adjacent to each other, the surfaces facing each other along a length L of 100 nm or more, is referred to as a WC/WC interface, and Na represents a total number of WC/WC interfaces and Nt represents a number of WC/WC interfaces having distance X of 1 nm or more and 5 nm or less and having therein an atomic percentage of Co higher than an average value of atomic percentages of Co in the tungsten carbide particles.Type: GrantFiled: July 2, 2018Date of Patent: August 18, 2020Assignee: Sumitomo Electric Hardmetal Corp.Inventors: Yasuki Kido, Daiji Tabayashi, Shinya Imamura
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Publication number: 20190233922Abstract: A cemented carbide comprising a first hard phase composed of tungsten carbide particles and a binder phase including Co, the cemented carbide having a ratio Nt/Na of 0.9 or more, where, in any surface or any cross section of the cemented carbide, a region in which there is a distance X of 5 nm or less between surfaces respectively of tungsten carbide particles adjacent to each other, the surfaces facing each other along a length L of 100 nm or more, is referred to as a WC/WC interface, and Na represents a total number of WC/WC interfaces and Nt represents a number of WC/WC interfaces having distance X of 1 nm or more and 5 nm or less and having therein an atomic percentage of Co higher than an average value of atomic percentages of Co in the tungsten carbide particles.Type: ApplicationFiled: July 2, 2018Publication date: August 1, 2019Applicants: SUMITOMO ELECTRIC HARDMETAL CORP., SUMITOMO ELECTRIC HARDMETAL CORP.Inventors: Yasuki Kido, Daiji Tabayashi, Shinya Imamura
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Patent number: 8389108Abstract: A surface-coated cutting tool of the present invention includes a substrate and a coated layer formed on the substrate, and the coated layer is a physical-vapor-deposition layer having a thickness of 10 ?m or more. A surface region having a thickness of 1 ?m from a surface of the coated layer includes a first region whose integrated residual stress is a compressive stress and a second region whose integrated residual stress is a tensile stress, and the integrated residual stress of the surface region falls within the range of ?1.5 to 1.5 GPa in any region included in the surface region.Type: GrantFiled: April 24, 2009Date of Patent: March 5, 2013Assignees: Sumitomo Electric Industries, Ltd., Sumitomo Electric Hardmetal Corp.Inventors: Hideki Moriguchi, Makoto Setoyama, Miki Miyanaga, Junya Okida, Sachiko Koike, Daiji Tabayashi
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Publication number: 20100260561Abstract: A surface-coated cutting tool of the present invention includes a substrate and a coated layer formed on the substrate, and the coated layer is a physical-vapor-deposition layer having a thickness of 10 ?m or more. A surface region having a thickness of 1 ?m from a surface of the coated layer includes a first region whose integrated residual stress is a compressive stress and a second region whose integrated residual stress is a tensile stress, and the integrated residual stress of the surface region falls within the range of ?1.5 to 1.5 GPa in any region included in the surface region.Type: ApplicationFiled: April 24, 2009Publication date: October 14, 2010Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD., SUMITOMO ELECTRIC HARDMETAL CORP.Inventors: Hideki Moriguchi, Makoto Setoyama, Miki Miyanaga, Junya Okida, Sachiko Koike, Daiji Tabayashi