Patents by Inventor Katsumi Okamura

Katsumi Okamura 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).

  • Patent number: 10717134
    Abstract: A cutting tool according to an aspect of the present disclosure includes a shank, a joint, and a cutting portion attached through the joint to the shank. The cutting portion includes a core and a surface portion. The surface portion is disposed around a central axis of the cutting portion to cover an outer circumferential surface of the core. The surface portion includes a cutting edge. The cutting edge is disposed on an outer circumferential surface of the surface portion and formed in a helical shape about the central axis. The surface portion is a composite sintered material including a hard phase formed of a plurality of diamond particles and a plurality of cubic boron nitride particles, and a binder phase forming the remainder.
    Type: Grant
    Filed: November 15, 2016
    Date of Patent: July 21, 2020
    Assignees: Sumitomo Electric Hardmetal Corp., Sumitomo Electric Industries, Ltd.
    Inventors: Yusuke Matsuda, Taisuke Higashi, Satoru Kukino, Takashi Kanda, Katsumi Okamura
  • Publication number: 20200156213
    Abstract: There is provided a super-abrasive grain including: a body composed of cubic boron nitride or diamond; and a ceramic coating film coating at least a portion of a surface of the body.
    Type: Application
    Filed: December 6, 2018
    Publication date: May 21, 2020
    Applicants: Sumitomo Electric Industries, Ltd., A.L.M.T. Corp.
    Inventors: Akito ISHII, Katsumi OKAMURA, Tomokazu NAKAMURA, Nobuhide NAKAMURA
  • Publication number: 20200130061
    Abstract: A sintered material has 3 vol % to 80 vol % of cBN grains and a binder. The binder contains: one or more types selected from the group consisting of one or more types of compounds composed of one or more types of first elements selected from the group consisting of a group 4 element, a group 5 element and a group 6 element in the periodic table, Al and Si and one or more types of second elements selected from the group consisting of C, N, O and B, and a solid solution of these compounds; and one or more types of metallic elements selected from the group consisting of Li, Ca, Na, Sr, Ba and Be. The binder contains the one or more types of metallic elements in an amount of 0.001 mass % to 0.5 mass % or less in total, and oxygen in an amount of 0.1 mass % to 10.0 mass %.
    Type: Application
    Filed: July 26, 2018
    Publication date: April 30, 2020
    Applicants: Sumitomo Electric Industries, Ltd, SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Katsumi OKAMURA, Akito ISHII, Satoru KUKINO
  • Patent number: 10625349
    Abstract: An object is to prolong the life of a cubic boron nitride cutting tool used for cutting a heat-resistant alloy. A cubic boron nitride cutting tool includes an edge tip made of a sintered cubic boron nitride compact including cubic boron nitride particles; and a base metal that holds the edge tip at a corner portion of the base metal, wherein a cutting edge formed on the edge tip of the tool has a positive rake angle.
    Type: Grant
    Filed: July 3, 2018
    Date of Patent: April 21, 2020
    Assignee: SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Tsutomu Hirano, Katsumi Okamura, Naoki Watanobe
  • Publication number: 20200102252
    Abstract: A composite sintered material includes a plurality of diamond grains, a plurality of cubic boron nitride grains, and a remainder of a binder phase, wherein the binder phase includes cobalt, a content of the cubic boron nitride grains in the composite sintered material is more than or equal to 3 volume % and less than or equal to 40 volume %, and an average length of line segments extending across continuous cubic boron nitride grains in appropriately specified straight lines extending through the composite sintered material is less than or equal to a length three times as large as an average grain size of the cubic boron nitride grains.
    Type: Application
    Filed: June 6, 2018
    Publication date: April 2, 2020
    Applicants: Sumitomo Electric Industries, Ltd., SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Naoki WATANOBE, Takashi HARADA, Katsumi OKAMURA, Akito ISHII, Satoru KUKINO, Taisuke HIGASHI
  • Publication number: 20200055780
    Abstract: A sintered material includes a first phase and a second phase, wherein the first phase is composed of cubic boron nitride particles, and the following relational expressions are satisfied when more than or equal to two cubic boron nitride particles adjacent to and in direct contact with each other among the cubic boron nitride particles are defined as a contact body, Di represents a length of an entire perimeter of the contact body, n represents the number of contact locations at which the cubic boron nitride particles are in direct contact with each other, dk represents a length of each of the contact locations, and ?dk (where k=1 to n) represents a total length of the contact locations: Dii=Di+(2×?dk (where k=1 to n)); and [(Dii?Di)/Dii]×100?50.
    Type: Application
    Filed: February 15, 2018
    Publication date: February 20, 2020
    Applicant: Sumitomo Electric industries, Ltd.
    Inventors: Akito ISHII, Katsumi OKAMURA
  • Publication number: 20190271062
    Abstract: A composite sintered material includes: a plurality of diamond grains having an average grain size of less than or equal to 10 ?m; a plurality of cubic boron nitride grains having an average grain size of less than or equal to 2 ?m; 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 more than or equal to 30 volume % and less than or equal to 94 volume %, a content of the cubic boron nitride grains is more than or equal to 3 volume % and less than or equal to 40 volume %, and a content of the cobalt is more than or equal to 3 volume % and less than or equal to 30 volume %.
    Type: Application
    Filed: October 10, 2017
    Publication date: September 5, 2019
    Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD., SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Katsumi Okamura, Naoki Watanobe, Akito Ishii, Takashi Harada, Satoru Kukino, Taisuke Higashi
  • Publication number: 20190247927
    Abstract: A cutting tool includes a base material, and a coating film covering the base material in contact with the base material. The base material is a cubic boron nitride sintered material. The coating film is a ceramic. An amount of oxygen in the coating film is less than or equal to 0.040 mass percent.
    Type: Application
    Filed: December 14, 2017
    Publication date: August 15, 2019
    Inventors: Katsumi Okamura, Satoru Kukino, Makoto Setoyama
  • Publication number: 20190240739
    Abstract: A sintered material includes a first material and a second material, wherein the first material is partially stabilized ZrO2 in which 1 to 90 volume % of Al2O3 is dispersed in crystal grain boundaries or crystal grains, the Al2O3 is a grain having a grain size of less than or equal to 1 ?m, 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.
    Type: Application
    Filed: July 10, 2017
    Publication date: August 8, 2019
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Akito ISHII, Takashi HARADA, Katsumi OKAMURA, Saturo KUKINO
  • Patent number: 10307829
    Abstract: A composite sintered body according to the present invention contains at least cubic boron nitride and a binder. Cubic boron nitride has a continuous skeleton structure as a result of bonding of a plurality of first cubic boron nitride particles to each other. The binder has a continuous structure as a result of bonding of a plurality of binder particles to each other, that are present in a region except for a bonding interface where the first cubic boron nitride particles are bonded to each other. Second cubic boron nitride particles isolated from the first cubic boron nitride particles forming the skeleton structure are dispersed in the continuous structure of the binder particles.
    Type: Grant
    Filed: January 6, 2015
    Date of Patent: June 4, 2019
    Assignee: SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Katsumi Okamura, Satoru Kukino, Tomohiro Fukaya
  • Patent number: 10293411
    Abstract: A cutting tool according to one aspect of the present disclosure includes an attaching portion, a cutting portion having a core portion and a surface portion, and a joint portion. The attaching portion includes a hard component and a hard material. The hard component is at least one selected from the group consisting of TiC, TiCN, W, WC, Al2O3, and a combination of at least one of CBN and diamond and at least one of W and WC. The hard material includes one or two or more types of iron group elements, and has a Young's modulus of not more than 350 GPa. The core portion includes a cemented carbide material. The surface portion includes PCD or CBN. The cutting portion has a chamfer portion. The surface portion includes a groove, a flank face, and a cutting edge. The cutting edge extends toward the attaching portion.
    Type: Grant
    Filed: November 15, 2016
    Date of Patent: May 21, 2019
    Assignees: Sumitomo Electric Hardmetal Corp., Sumitomo Electric Industries, Ltd.
    Inventors: Taisuke Higashi, Yusuke Matsuda, Satoru Kukino, Takashi Kanda, Katsumi Okamura
  • Patent number: 10272498
    Abstract: A composite sintered material contains cubic boron nitride particles and binder particles. The composite sintered material contains 40 vol % or more and 80 vol % or less of the cubic boron nitride particles. The binder particles contain TiCN particles. The composite sintered material shows a first peak belonging to a (200) plane of the TiCN particles in a range in which a Bragg angle 2? is 41.7° or more and 42.6° or less in an X-ray diffraction spectrum measured using a Cu-K? ray as a ray source.
    Type: Grant
    Filed: March 20, 2015
    Date of Patent: April 30, 2019
    Assignee: Sumitomo Electric Hardmetal Corp.
    Inventors: Naoki Watanobe, Yusuke Matsuda, Katsumi Okamura, Nozomi Tsukihara, Makoto Setoyama
  • Publication number: 20190118256
    Abstract: An alloy powder contains greater than or equal to 3% by mass and less than or equal to 30% by mass of tungsten, greater than or equal to 2% by mass and less than or equal to 30% by mass of aluminum, greater than or equal to 0.2% by mass and less than or equal to 15% by mass of oxygen, and at least one of cobalt and nickel as the balance. The alloy powder has an average particle diameter of greater than or equal to 0.1 ?m and less than or equal to 10 ?m.
    Type: Application
    Filed: April 19, 2017
    Publication date: April 25, 2019
    Inventors: Akito Ishii, Takashi Harada, Katsumi Okamura, Satoru Kukino
  • Publication number: 20180369924
    Abstract: A cutting tool according to one aspect of the present disclosure includes an attaching portion, a cutting portion having a core portion and a surface portion, and a joint portion. The attaching portion includes a hard component and a hard material. The hard component is at least one selected from the group consisting of TiC, TiCN, W, WC, Al2O3, and a combination of at least one of CBN and diamond and at least one of W and WC. The hard material includes one or two or more types of iron group elements, and has a Young's modulus of not more than 350 GPa. The core portion includes a cemented carbide material. The surface portion includes PCD or CBN. The cutting portion has a chamfer portion. The surface portion includes a groove, a flank face, and a cutting edge. The cutting edge extends toward the attaching portion.
    Type: Application
    Filed: November 15, 2016
    Publication date: December 27, 2018
    Applicants: SUMITOMO ELECTRIC HARDMETAL CORP., Sumitomo Electric Industries, Ltd., Sumitomo Electric Industries, Ltd.
    Inventors: Taisuke Higashi, Yusuke Matsuda, Satoru Kukino, Takashi Kanda, Katsumi Okamura
  • Patent number: 10160083
    Abstract: A method for manufacturing a cubic boron nitride cutting tool including a base metal and sintered cubic boron nitride compact at a corner portion of the base metal, capable of improving the accuracy of the center height and reducing the angle of inclination or width of a negative rake face; and the cubic boron nitride cutting tool. The method includes grinding the compact by pressing it against an end face of a grindstone of a grinder to form flank and rake faces on the compact while the base metal of the cutting tool is held by a chuck of the grinder, so that the compact is substantially ground. The rake face is formed to be recessed from a top face of the base metal or only a portion of the compact that protrudes from a base-metal rake face is ground while the tool is continuously held by the chuck.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: December 25, 2018
    Assignee: SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Naoki Watanobe, Katsumi Okamura, Hiroki Yonekura, Yosuke Korogi
  • Publication number: 20180361485
    Abstract: A cutting tool according to an aspect of the present disclosure includes a shank, a joint, and a cutting portion attached through the joint to the shank. The cutting portion includes a core and a surface portion. The surface portion is disposed around a central axis of the cutting portion to cover an outer circumferential surface of the core. The surface portion includes a cutting edge. The cutting edge is disposed on an outer circumferential surface of the surface portion and formed in a helical shape about the central axis. The surface portion is a composite sintered material including a hard phase formed of a plurality of diamond particles and a plurality of cubic boron nitride particles, and a binder phase forming the remainder.
    Type: Application
    Filed: November 15, 2016
    Publication date: December 20, 2018
    Inventors: Yusuke Matsuda, Taisuke Higashi, Satoru Kukino, Takashi Kanda, Katsumi Okamura
  • Publication number: 20180311744
    Abstract: An object is to prolong the life of a cubic boron nitride cutting tool used for cutting a heat-resistant alloy. A cubic boron nitride cutting tool includes an edge tip made of a sintered cubic boron nitride compact including cubic boron nitride particles; and a base metal that holds the edge tip at a corner portion of the base metal, wherein a cutting edge formed on the edge tip of the tool has a positive rake angle.
    Type: Application
    Filed: July 3, 2018
    Publication date: November 1, 2018
    Applicant: SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Tsutomu HIRANO, Katsumi OKAMURA, Naoki WATANOBE
  • Patent number: 10030299
    Abstract: A surface-coated boron nitride sintered body tool includes a cubic boron nitride sintered body and a coating film formed thereon. The coating film includes an A layer and a C layer. The A layer is formed of Ti1-xaMaxaC1-yaNya (where Ma is one or more of Cr, Nb and W; 0?xa?0.7; 0?ya?1). The C layer is formed of Al1-(xc+yc)CrxcMcycN (where Mc is one or more of Ti, V and Si; 0.2?xc?0.8; 0?yc?0.6; 0.2?xc+yc?0.8). The A layer is formed on an outermost surface of the coating film or between the outermost surface of the coating film and the C layer. A distance between the outermost surface of the coating film and an upper surface of the C layer is 0.1 ?m or more and 1.0 ?m or less.
    Type: Grant
    Filed: September 19, 2014
    Date of Patent: July 24, 2018
    Assignee: SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Nozomi Tsukihara, Makoto Setoyama, Katsumi Okamura
  • Patent number: 10016813
    Abstract: A surface-coated boron nitride sintered body tool is provided, in which at least a cutting edge portion includes a cubic boron nitride sintered body and a coating film formed on a surface of the cubic boron nitride sintered body. The coating film contains Si and includes a B layer formed by alternately stacking one or more of each of a B1 compound layer and a B2 compound layer that are different in composition. A ratio between an average thickness t1 of the B1 compound layers and an average thickness t2 of the B2 compound layers is defined as t2/t1 that satisfies a relation of 0.5<t2/t1?10.
    Type: Grant
    Filed: June 5, 2014
    Date of Patent: July 10, 2018
    Assignee: SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Nozomi Tsukihara, Katsumi Okamura, Makoto Setoyama
  • Patent number: 10010940
    Abstract: An object is to prolong the life of a cubic boron nitride cutting tool used for cutting a heat-resistant alloy. A cubic boron nitride cutting tool includes an edge tip made of a sintered cubic boron nitride compact having a thermal conductivity within the range of 20 to 70 W/m·K and including cubic boron nitride particles having an average particle diameter within the range of 0.5 ?m to 2 ?m; and a base metal that holds the edge tip at a corner portion of the base metal, wherein a cutting edge formed on the edge tip of the tool has a positive rake angle.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: July 3, 2018
    Assignee: SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Tsutomu Hirano, Katsumi Okamura, Naoki Watanobe