Patents by Inventor Shogo Murakami

Shogo Murakami 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: 10604823
    Abstract: A forged titanium alloy material having a duplex grain structure composed of flat grains and non-flat grains, wherein the flat grains are crystal grains of prior-? grains each having an aspect ratio of more than 3 and the non-flat grains are crystal grains of prior-? grains each having an aspect ratio of 1 to 3 inclusive. The forged titanium alloy material is characterized in that the average equivalent circle diameter of the non-flat grains is 100 ?m or less, flat grains each having a thicknesswise diameter of 20 to 500 ?m are contained in an amount of 40 to 98%, non-flat grains each having a thicknesswise diameter of 10 to 150 ?m are contained in an amount of 2 to 50%, and the flat grains each having the above-mentioned thicknesswise diameter and the non-flat grains each having the above-mentioned thicknesswise diameter are contained in the total amount of 90% or more.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: March 31, 2020
    Assignee: KOBE STEEL, LTD.
    Inventors: Yoshinori Ito, Shogo Murakami, Keiji Kinoshita
  • Patent number: 10491059
    Abstract: While lamination of steel sheets to be included in a stator core having a plurality of tooth portions is performed through swaging at yoke portions and through swaging at tooth portions, the stator core is formed in such a way as to include the tooth portion having a portion that is pressed into another steel sheet through swaging and the tooth portion having no portion that is pressed into another steel sheet through swaging.
    Type: Grant
    Filed: January 15, 2015
    Date of Patent: November 26, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tadashi Murakami, Naomi Kikuchi, Atsushi Sakaue, Tatsuro Hino, Akihiro Yamamura, Shogo Okamoto, Shinji Nishimura, Masaya Inoue
  • Publication number: 20190212693
    Abstract: There are provided a developer accommodating portion for accommodating the developer, a discharge portion formed with a discharge opening for discharging the developer accommodated in the developer accommodating portion, and an engaging portion 30. The engaging portion 30 is engaged with an engaged portion 11b with a mounting operation of a developer supply container 1 to displace a developer receiving portion 11 in an upward direction U so that the receiving opening communicates with the discharge opening. The engaging portion 30 has a holding portion 31 which is provided rotatably about a rotation shaft 41 and is provided with holding portion 21 to be engaged with the engaged portion 11b to hold the engaged portion 11b. With the mounting operation, the engaging portion 30 rotates about the rotation shaft 41 so that the engaged portion 11b held by the holding portion 31 moves upward U.
    Type: Application
    Filed: March 15, 2019
    Publication date: July 11, 2019
    Inventors: Ayatomo Okino, Hiromasa Katayama, Nobuyuki Yomoda, Masato Yamaoka, Akihito Kamura, Koji Katayama, Tsukasa Mine, Katsuya Murakami, Keisuke Isobe, Shogo Yamasaki
  • Publication number: 20180371595
    Abstract: Provided is a titanium-alloy forging material in which fatigue-strength characteristics are improved without worsening ultrasonic flaw detection. A ?-forged titanium-alloy forging material (1) is characterized in that the area ratio of non-flat grains, which are prior ?-grains (2) having an aspect ratio of 3 or less and a diameter in the forging direction of at least 20 ?m, and an ?-phase ratio at the crystal grain boundary (3) of at least 80%, is less than 10%, and the area ratio of flat grains, which are prior ?-grains having an aspect ratio greater than 3 and a diameter in the forging direction of 20-700 ?m, and an ?-phase ratio at the crystal grain boundary (3) of at least 80%, is 85% or greater, and the average orientation difference of the ?-phase crystal orientation deposited at the crystal grain boundary (3) of the flat grains is at least 6°.
    Type: Application
    Filed: August 29, 2018
    Publication date: December 27, 2018
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Yoshinori Ito, Shogo Murakami
  • Publication number: 20180251876
    Abstract: Disclosed herein is a mechanical structure steel for cold-working that includes C, Si, Mn, P, S, Al, and N and has a metal microstructure including proeutectoid ferrite and pearlite, in which a total area ratio of the proeutectoid ferrite and the pearlite with respect to the entire microstructure is 90% or more, while an area ratio Af of the proeutectoid ferrite with respect to the entire microstructure satisfies a relationship of Af?A where an A value is represented by formula (1) below, an average circle equivalent diameter of a bcc-Fe crystal grain is in a range of 15 to 30 ?m, and a pearlite lamellar spacing is 0.20 ?m or less on average: A=(103?128×[C(%)])×0.80(%)??(1) where [C (%)] in the formula (1) indicates the C content in percent by mass.
    Type: Application
    Filed: August 12, 2016
    Publication date: September 6, 2018
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Yuki SASAKI, Takuya KOCHI, Masamichi CHIBA, Masayuki SAKATA, Shogo MURAKAMI
  • Patent number: 9682420
    Abstract: A forging die device is provided with an upper die 10 and a lower die 20. At least one die 10 (20) of the upper die 10 and the lower die 20 has a die holder 12 (22) which surrounds the outer periphery of the die 10 (20) and holds the die 10 (20). The die holder 12 (22) is configured to bear the radial tensile stress (tensile force) received by the die 10 (20) during forging. By this means, the die 10 (20) can be miniaturized.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: June 20, 2017
    Assignee: Kobe Steel, Ltd.
    Inventors: Takashi Choda, Yukihide Honda, Shigeomi Araki, Shogo Murakami, Soichiro Kojima, Yusuke Momota
  • Patent number: 9623476
    Abstract: A forging die device is configured in such a manner that die heating heater plates 11, 21 are disposed respectively between a die 1 which is held at the outer periphery by die holders 12, 22, and die holding means 14a, 24a composed of heat insulating plates 13, 23 and die plates 14, 24, and the die holders, the die holding means and the die plates are integrated together. After the preheated die 1 is placed on the heated die holding means, the die 1 is heated by heating means, and forming surfaces 10a, 20a of the die are heated to a required temperature immediately before forging.
    Type: Grant
    Filed: April 2, 2013
    Date of Patent: April 18, 2017
    Assignee: Kobe Steel, Ltd.
    Inventors: Takashi Choda, Yukihide Honda, Shigeomi Araki, Shogo Murakami, Soichiro Kojima, Yusuke Momota
  • Patent number: 9353432
    Abstract: Disclosed is a pure titanium sheet having a strength corresponding to JIS Grade 2 level (215 MPa in terms of 0.2% yield strength) or more and having satisfactory stamping formability. The pure titanium sheet includes titanium and inevitable impurities, has a 0.2% yield strength of 215 MPa or more, has an average grain size d of its structure of 25 ?m or more and 75 ?m or less, and has a hexagonal crystal structure, in which respective grains in the hexagonal crystal structure have an average of Schmidt factors (SF) of (11-22) twins with a rolling direction as axes, and the average Schmidt factor (SF) and the average grain size d satisfy following Expression (1): 0.055?[SF/?d]?0.084??(1).
    Type: Grant
    Filed: January 13, 2012
    Date of Patent: May 31, 2016
    Assignee: Kobe Steel, Ltd.
    Inventors: Akihisa Fujita, Yoshio Itsumi, Hideto Oyama, Takeshi Kudo, Shogo Murakami
  • Publication number: 20160060729
    Abstract: A forged titanium alloy material having a duplex grain structure composed of flat grains and non-flat grains, wherein the flat grains are crystal grains of prior-? grains each having an aspect ratio of more than 3 and the non-flat grains are crystal grains of prior-? grains each having an aspect ratio of 1 to 3 inclusive. The forged titanium alloy material is characterized in that the average equivalent circle diameter of the non-flat grains is 100 ?m or less, flat grains each having a thicknesswise diameter of 20 to 500 ?m are contained in an amount of 40 to 98%, non-flat grains each having a thicknesswise diameter of 10 to 150 ?m are contained in an amount of 2 to 50%, and the flat grains each having the above-mentioned thicknesswise diameter and the non-flat grains each having the above-mentioned thicknesswise diameter are contained in the total amount of 90% or more.
    Type: Application
    Filed: June 5, 2013
    Publication date: March 3, 2016
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOKE STEEL, LTD.)
    Inventors: Yoshinori ITO, Shogo MURAKAMI, Keiji KINOSHITA
  • Patent number: 9267183
    Abstract: A hot-rolled wire rod excelling in wire drawability is provided, in which breakage can be suppressed even in heavy work from a large diameter. A hot-rolled wire rod contains C: 0.35 to 0.65% (percent by mass, hereinafter expressed as well), Si: 1.4 to 3.0%, Mn: 0.10 to 1.0%, Cr: 0.1 to 2.0%, P: 0.025% or less (exclusive of 0%), S: 0.025% or less (exclusive of 0%), N: 0.006% or less (exclusive of 0%), Al: 0.1% or less (exclusive of 0%), and O: 0.0030% or less (exclusive of 0%), with the remnant consisting of Fe and inevitable impurities; wherein the content of hydrogen in steel is 2.50 ppm (ppm by mass, hereinafter expressed as well) or less, and hardness (HV) is 460×C00.1 or less (C0 indicates the content of C (percent by mass) in a position of depth of D/4 (D: diameter of the wire rod)).
    Type: Grant
    Filed: November 7, 2006
    Date of Patent: February 23, 2016
    Assignee: Kobe Steel, Ltd.
    Inventors: Takuya Kochi, Shogo Murakami, Shoji Miyazaki, Ken Ishida, Masao Toyama, Fujio Koizumi
  • Publication number: 20150337424
    Abstract: Provided is a titanium-alloy forging material in which fatigue-strength characteristics are improved without worsening ultrasonic flaw detection. A ?-forged titanium-alloy forging material (1) is characterized in that the area ratio of non-flat grains, which are prior ?-grains (2) having an aspect ratio of 3 or less and a diameter in the forging direction of at least 20 ?m, and an ?-phase ratio at the crystal grain boundary (3) of at least 80%, is less than 10%, and the area ratio of flat grains, which are prior ?-grains having an aspect ratio greater than 3 and a diameter in the forging direction of 20-700 ?m, and an ?-phase ratio at the crystal grain boundary (3) of at least 80%, is 85% or greater, and the average orientation difference of the ?-phase crystal orientation deposited at the crystal grain boundary (3) of the flat grains is at least 6°.
    Type: Application
    Filed: January 21, 2014
    Publication date: November 26, 2015
    Applicant: KABUSHIKI KAISHA Kobe SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Yoshinori ITO, Shogo MURAKAMI
  • Patent number: 9005378
    Abstract: Disclosed is a spring steel wire rod that comprises C in a range of 0.35 to 0.65% (mass %, the same applies to respective elements described hereinafter), Si in a range of 1.4 to 2.2%, Mn in a range of 0.10 to 1.0%, Cr in a range of 0.1 to 2.0%, P not more than 0.025% (0% excluded), and S not more than 0.025% (0% excluded), balance comprising iron, and unavoidable impurities, wherein an average grain size Dc of a central part of the steel wire rod is not more than 80 ?m while an average grain size Ds of a surface layer part of the steel wire rod is not less than 3.0 ?m.
    Type: Grant
    Filed: August 15, 2008
    Date of Patent: April 14, 2015
    Assignee: Kobe Steel, Ltd.
    Inventors: Takuya Kochi, Shogo Murakami, Takeshi Kuroda, Hiromichi Tsuchiya
  • Publication number: 20150052962
    Abstract: A forging die device is provided with an upper die 10 and a lower die 20. At least one die 10 (20) of the upper die 10 and the lower die 20 has a die holder 12 (22) which surrounds the outer periphery of the die 10 (20) and holds the die 10 (20). The die holder 12 (22) is configured to bear the radial tensile stress (tensile force) received by the die 10 (20) during forging. By this means, the die 10 (20) can be miniaturized.
    Type: Application
    Filed: March 27, 2013
    Publication date: February 26, 2015
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Takashi Choda, Yukihide Honda, Shigeomi Araki, Shogo Murakami, Soichiro Kojima, Yusuke Momota
  • Publication number: 20150013421
    Abstract: A forging die device is configured in such a manner that die heating heater plates 11, 21 are disposed respectively between a die 1 which is held at the outer periphery by die holders 12, 22, and die holding means 14a, 24a composed of heat insulating plates 13, 23 and die plates 14, 24, and the die holders, the die holding means and the die plates are integrated together. After the preheated die 1 is placed on the heated die holding means, the die 1 is heated by heating means, and forming surfaces 10a, 20a of the die are heated to a required temperature immediately before forging.
    Type: Application
    Filed: April 2, 2013
    Publication date: January 15, 2015
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Takashi Choda, Yukihide Honda, Shigeomi Araki, Shogo Murakami, Soichiro Kojima, Yusuke Momota
  • Patent number: 8470105
    Abstract: A high carbon steel wire material which is made of high carbon steel as a raw material for wire products such as steel cords, bead wires, PC steel wires and spring steel, allows for these wire products to be manufactured efficiently at a high wire drawing rate and has excellent wire drawability and a manufacturing process thereof. This high carbon steel wire material is made of a steel material having specific contents of C, Si, Mn, P, S, N, Al and O, and the Bcc-Fe crystal grains of its metal structure have an average crystal grain diameter (Dave) of 20 ?m or less and a maximum crystal grain diameter (Dmax) of 120 ?m or less, preferably an area ratio of crystal grains having a diameter of 80 ?m or more of 40% or less, an average sub grain diameter (dave) of 10 ?m or less, a maximum sub grain diameter (dmax) of 50 ?m or less and a (Dave/dave) ratio of the average crystal grain diameter (Dave) to the average sub grain diameter (dave) of 4.5 or less.
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: June 25, 2013
    Assignee: Kobe Steele, Ltd.
    Inventors: Takuya Kochi, Shogo Murakami, Hiroshi Yaguchi, Takeshi Kuroda, Hidenori Sakai, Tomotada Maruo, Takaaki Minamida
  • Patent number: 8273292
    Abstract: The present invention provides a steel for machine and structural use which sustains mechanical properties such as strength by reducing S content, and exerts excellent machinability (in particular, tool life) in both of intermittent cutting with HSS tools and continuous cutting with carbide tools. The invention relates to a steel for machine and structural use which contains an oxide inclusion containing, wherein a total mass of an average composition of the oxide inclusions is 100%: CaO: 10 to 55 mass %; SiO2: 20 to 70 mass %; Al2O3: more than 0 and 35 mass % or less; MgO: more than 0 and 20 mass % or less; MnO: more than 0 and 5 mass % or less; and one or more members selected from the group consisting of Li2O, Na2O, K2O, BaO, SrO and TiO2: 0.5 to 20 mass % in total.
    Type: Grant
    Filed: January 20, 2009
    Date of Patent: September 25, 2012
    Assignee: Kobe Steel, Ltd.
    Inventors: Koichi Sakamoto, Motohiro Horiguchi, Shogo Murakami, Hiroshi Yaguchi, Shinsuke Masuda, Koichi Akazawa
  • Publication number: 20120193084
    Abstract: Disclosed is a pure titanium sheet having a strength corresponding to JIS Grade 2 level (215 MPa in terms of 0.2% yield strength) or more and having satisfactory stamping formability. The pure titanium sheet includes titanium and inevitable impurities, has a 0.2% yield strength of 215 MPa or more, has an average grain size d of its structure of 25 ?m or more and 75 ?m or less, and has a hexagonal crystal structure, in which respective grains in the hexagonal crystal structure have an average of Schmidt factors (SF) of (11-22) twins with a rolling direction as axes, and the average Schmidt factor (SF) and the average grain size d satisfy following Expression (1): 0.055?[SF/?d]?0.
    Type: Application
    Filed: January 13, 2012
    Publication date: August 2, 2012
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Akihisa FUJITA, Yoshio Itsumi, Hideto Oyama, Takeshi Kudo, Shogo Murakami
  • Patent number: 8192565
    Abstract: The present invention provides a steel for machine and structural use which is capable of maintaining mechanical characteristics such as strength by reducing a S content as well as of exhibiting excellent machinability (particularly tool life) in intermittent cutting (such as hobbing) with the high speed tool, and a method useful for producing the steel for machine and structural use. The steel for machine and structural use according to the invention secures 0.002% or more of solute N in the steel and has a chemical composition which is appropriately adjusted and satisfies a relationship of the following expression (1): (0.1×[Cr]+[Al])/[O]?150 . . . (1), in which [Cr], [Al], and [0] represent a Cr content (mass %), an Al content (mass %), and an O content (mass %), respectively.
    Type: Grant
    Filed: June 23, 2008
    Date of Patent: June 5, 2012
    Assignee: Kobe Steel, Ltd.
    Inventors: Tomokazu Masuda, Takehiro Tsuchida, Masaki Shimamoto, Motohiro Horiguchi, Shinsuke Masuda, Koichi Akazawa, Shogo Murakami, Mutsuhisa Nagahama, Hiroshi Yaguchi, Koichi Sakamoto
  • Publication number: 20110229363
    Abstract: The present invention provides a steel for machine and structural use which sustains mechanical properties such as strength by reducing S content, and exerts excellent machinability (in particular, tool life) in both of intermittent cutting with HSS tools and continuous cutting with carbide tools. The invention relates to a steel for machine and structural use which contains an oxide inclusion containing, wherein a total mass of an average composition of the oxide inclusions is 100%: CaO: 10 to 55 mass %; SiO2: 20 to 70 mass %; Al2O3: more than 0 and 35 mass % or less; MgO: more than 0 and 20 mass % or less; MnO: more than 0 and 5 mass % or less; and one or more members selected from the group consisting of Li2O, Na2O, K2O, BaO, SrO and TiO2: 0.5 to 20 mass % in total.
    Type: Application
    Filed: January 20, 2009
    Publication date: September 22, 2011
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Koichi Sakamoto, Motohiro Horiguchi, Shogo Murakami, Hiroshi Yaguchi, Shinsuke Masuda, Koichi Akazawa
  • Publication number: 20100193090
    Abstract: The present invention provides a steel for machine and structural use which is capable of maintaining mechanical characteristics such as strength by reducing a S content as well as of exhibiting excellent machinability (particularly tool life) in intermittent cutting (such as hobbing) with the high speed tool, and a method useful for producing the steel for machine and structural use. The steel for machine and structural use according to the invention secures 0.002% or more of solute N in the steel and has a chemical composition which is appropriately adjusted and satisfies a relationship of the following expression (1): (0.1×[Cr]+[Al])/[O]?150 . . . (1), in which [Cr], [Al], and [0] represent a Cr content (mass %), an Al content (mass %), and an O content (mass %), respectively.
    Type: Application
    Filed: June 23, 2008
    Publication date: August 5, 2010
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Tomokazu Masuda, Takehiro Tsuchida, Masaki Shimamoto, Motohiro Horiguchi, Shinsuke Masuda, Koichi Akazawa, Shogo Murakami, Mutsuhisa Nagahama, Hiroshi Yaguchi, Koichi Sakamoto