Patents by Inventor Hideto Oyama
Hideto Oyama 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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Patent number: 10022784Abstract: For continuously casting an ingot of titanium or titanium alloy, molten titanium or titanium alloy is poured into a top opening of a bottomless mold with a circular cross-sectional shape, the solidified molten metal in the mold is pulled downward from the mold, a plurality of plasma torches disposed on an upper side of molten metal in the mold such that their centers are located directly vertically above the molten metal in the mold, are operated to generate plasma arcs that heat the molten metal in the mold, and the plasma torches are moved in a horizontal direction above a melt surface of the molten metal in the mold, along a trajectory located directly vertically above the molten metal in the mold, while keeping a mutual distance between the respective plasma torches such that the plasma torches do not interfere with each other.Type: GrantFiled: October 18, 2016Date of Patent: July 17, 2018Assignee: KOBE STEEL, LTD.Inventors: Eisuke Kurosawa, Takehiro Nakaoka, Kazuyuki Tsutsumi, Hideto Oyama, Hidetaka Kanahashi
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Patent number: 9908174Abstract: In the present invention the torch movement period is 20-40 seconds, with the torch movement period being the time required to move plasma torches (which heat the surface of molten metal in the casting mold) one time. The average heat input amount at multiple sites, which are obtained by dividing the initial solidification portion (which is where the molten metal makes contact with the casting mold and first solidifies) into multiple sites in the circumferential direction of the casting mold, is 1.0-2.0 MW/m2. The molten metal advection time, which is the time required for electromagnetically stirred molten metal to travel the length of the torch heating region of the surface of the molten metal in the lengthwise direction of the casting mold, is 3.5 seconds or less.Type: GrantFiled: September 28, 2017Date of Patent: March 6, 2018Assignee: Kobe Steel, Ltd.Inventors: Eisuke Kurosawa, Takehiro Nakaoka, Hideto Oyama, Hidetaka Kanahashi
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Publication number: 20180044763Abstract: To provide an ?-? titanium alloy that has high strength and excellent hot workability of the level of the ?-? titanium alloy, typified by the Ti-6Al-4V, while exhibiting more excellent machinability than the Ti-6Al-4V. The ?-? titanium alloy includes, in percent by mass: at least one element of 0.1 to 2.0% of Cu and 0.1 to 2.0% of Ni; 2.0 to 8.5% of Al; 0.08 to 0.25% of C; and 1.0 to 7.0% in total of at least one element of 0 to 4.5% of Cr and 0 to 2.5% of Fe, with the balance being Ti and inevitable impurities.Type: ApplicationFiled: March 16, 2016Publication date: February 15, 2018Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Keitaro TAMURA, Koichi AKAZAWA, Yoshio ITSUMI, Hideto OYAMA
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Publication number: 20180015534Abstract: In the present invention the torch movement period is 20-40 seconds, with the torch movement period being the time required to move plasma torches (which heat the surface of molten metal in the casting mold) one time. The average heat input amount at multiple sites, which are obtained by dividing the initial solidification portion (which is where the molten metal makes contact with the casting mold and first solidifies) into multiple sites in the circumferential direction of the casting mold, is 1.0-2.0 MW/m2. The molten metal advection time, which is the time required for electromagnetically stirred molten metal to travel the length of the torch heating region of the surface of the molten metal in the lengthwise direction of the casting mold, is 3.5 seconds or less.Type: ApplicationFiled: September 28, 2017Publication date: January 18, 2018Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Eisuke KUROSAWA, Takehiro NAKAOKA, Hideto OYAMA, Hidetaka KANAHASHI
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Patent number: 9790576Abstract: Disclosed is a titanium or titanium alloy plate rolled in one direction, wherein a lubricating film is coated on the surface and the coefficient of sliding friction of the lubricating film-coated surface is controlled to less than 0.15. The elongation (L-El) of the titanium or titanium alloy plate in the rolling direction and the r value (T-r) in the direction perpendicular to the rolling direction have the following relation (1). (T-r)/(L-El)?0.Type: GrantFiled: December 10, 2009Date of Patent: October 17, 2017Assignee: Kobe Steel, Ltd.Inventors: Akihisa Fujita, Hideto Oyama, Yoshio Itsumi, Tadashige Nakamoto, Kayo Yamamoto
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Patent number: 9682421Abstract: Provided is a device for titanium continuous casting (1) capable, even when continuously casting large diameter titanium ingots or titanium alloy ingots, of suppressing component segregation thereof. The device for titanium continuous casting (1) comprises: a mold (3) having an upper section having a circular upper opening (3a) for pouring in molten metal (6), and a bottom section having a lower opening for continuously drawing ingots (11); and a plurality of plasma torches (4, 5) to heat the molten metal in the mold (3) from the upper opening (3a) side. The plurality of plasma torches (4, 5) are disposed so that the amount of heat input to the molten metal (6) present in the outer circumference enclosing the center of the upper opening (3a) is greater than the amount of heat input to the molten metal (6) present in the center of the upper opening (3a).Type: GrantFiled: December 17, 2013Date of Patent: June 20, 2017Assignee: Kobe Steel, Ltd.Inventors: Hidetaka Kanahashi, Hideto Oyama, Takehiro Nakaoka, Eisuke Kurosawa, Kazuyuki Tsutsumi
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Publication number: 20170087625Abstract: In the present invention the torch movement period is 20-40 seconds, with the torch movement period being the time required to move plasma torches (which heat the surface of molten metal in the casting mold) one time. The average heat input amount at multiple sites, which are obtained by dividing the initial solidification portion (which is where the molten metal makes contact with the casting mold and first solidifies) into multiple sites in the circumferential direction of the casting mold, is 1.0-2.0 MW/m2. The molten metal advection time, which is the time required for electromagnetically stirred molten metal to travel the length of the torch heating region of the surface of the molten metal in the lengthwise direction of the casting mold, is 3.5 seconds or less.Type: ApplicationFiled: March 20, 2015Publication date: March 30, 2017Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Eisuke KUROSAWA, Takehiro NAKAOKA, Hideto OYAMA, Hidetaka KANAHASHI
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Publication number: 20170074599Abstract: Provided are a welded titanium tube capable of improving heat-transfer performance and detecting surface defects and a manufacturing method therefor. The welded titanium tube is formed of a tubular-shaped titanium plate, whose edges are butt-welded. The welded titanium tube includes an outer peripheral surface and an inner peripheral surface, at least one of which is provided with a concavo-convex pattern including a base surface and a plurality of protrusions. A mean maximum height of the protrusions is in the range of 12 to 45 ?m. A ratio of a maximum value to a mean pitch of the protrusions is less than 2. A ratio of a mean maximum dimension of the protrusions to the mean pitch is 0.90 or less, and a ratio of the mean maximum height to a wall thickness is 0.11 or less.Type: ApplicationFiled: March 11, 2015Publication date: March 16, 2017Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)Inventors: Keitaro TAMURA, Yasuyuki FUJII, Yoshio ITSUMI, Hideto OYAMA
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Publication number: 20170036265Abstract: For continuously casting an ingot of titanium or titanium alloy, molten titanium or titanium alloy is poured into a top opening of a bottomless mold with a circular cross-sectional shape, the solidified molten metal in the mold is pulled downward from the mold, a plurality of plasma torches disposed on an upper side of molten metal in the mold such that their centers are located directly vertically above the molten metal in the mold, are operated to generate plasma arcs that heat the molten metal in the mold, and the plasma torches are moved in a horizontal direction above a melt surface of the molten metal in the mold, along a trajectory located directly vertically above the molten metal in the mold, while keeping a mutual distance between the respective plasma torches such that the plasma torches do not interfere with each other.Type: ApplicationFiled: October 18, 2016Publication date: February 9, 2017Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)Inventors: Eisuke KUROSAWA, Takehiro NAKAOKA, Kazuyuki TSUTSUMI, Hideto OYAMA, Hidetaka KANAHASHI
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Publication number: 20160363395Abstract: A plate for a heat-exchanging plate comprises a metallic flat plate having fine irregularities formed on a surface thereof, the metallic flat plate obtained through press-working which is implemented as a post-process, of the flat plate. The irregularities include a plurality of projections that are formed at a predetermined spacing, and the plurality of projections includes first ridges disposed at an angle +? with respect to a width direction of the plate and second ridges disposed at an angle ?? with respect to the width direction of the plate, the projections being formed into V-shapes by the first ridges and the second ridges.Type: ApplicationFiled: February 19, 2015Publication date: December 15, 2016Applicant: Kaboshiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Keitaro TAMURA, Yasuyuki FUJII, Yoshio ITSUMI, Hideto OYAMA
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Patent number: 9475114Abstract: By controlling the temperature (TS) of a surface portion (11a) of an ingot (11) in a contact region (16) between a mold (2) and the ingot (11) and/or a passing heat flux (q) from the surface portion (11a) of the ingot (11) to the mold (2) in the contact region (16), the thickness (D) in the contact region (16) of a solidified shell (13) obtained by the solidification of molten metal (12) is brought into a predetermined range. Consequently, an ingot having a good casting surface state can be cast.Type: GrantFiled: January 10, 2014Date of Patent: October 25, 2016Assignee: Kobe Steel, Ltd.Inventors: Eisuke Kurosawa, Takehiro Nakaoka, Kazuyuki Tsutsumi, Hideto Oyama, Hidetaka Kanahashi, Hitoshi Ishida, Daiki Takahashi, Daisuke Matsuwaka
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Patent number: 9427796Abstract: Disclosed is a continuous casting method in which a melt obtained by melting titanium or a titanium alloy is poured into a bottomless mold and is drawn downward while being solidified, wherein: the surface of the melt in the mold is heated by horizontally moving a plasma torch over the surface of the melt; thermocouples are provided at a plurality of locations along the circumferential direction of the mold; if the temperature of the mold measured by one of the thermocouples is lower than a target temperature, then the output of the plasma torch is increased when the plasma torch comes close to the location where that thermocouple is installed; and if said temperature is higher than the target temperature, then the output of the plasma torch is decreased when the plasma torch comes close to the location where that thermocouple is installed.Type: GrantFiled: January 23, 2014Date of Patent: August 30, 2016Assignee: Kobe Steel, Ltd.Inventors: Takehiro Nakaoka, Eisuke Kurosawa, Kazuyuki Tsutsumi, Hideto Oyama, Hidetaka Kanahashi, Hitoshi Ishida, Daiki Takahashi, Daisuke Matsuwaka
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Patent number: 9353432Abstract: 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: GrantFiled: January 13, 2012Date of Patent: May 31, 2016Assignee: Kobe Steel, Ltd.Inventors: Akihisa Fujita, Yoshio Itsumi, Hideto Oyama, Takeshi Kudo, Shogo Murakami
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Patent number: 9333556Abstract: A continuous casting method in which a molten metal obtained by melting titanium or a titanium alloy is injected into a bottomless mold having a rectangular cross-section and withdrawn downward while being caused to solidify, wherein a plasma torch (7) is caused to rotate in the horizontal direction above the surface of the molten metal (12) in the mold (2), and a horizontally rotating flow is generated by electromagnetic stirring on at least the surface of the molten metal (12) in the mold (2). It is thereby possible to cast a slab in which the casting surface condition is excellent.Type: GrantFiled: January 23, 2014Date of Patent: May 10, 2016Assignee: Kobe Steel, Ltd.Inventors: Eisuke Kurosawa, Takehiro Nakaoka, Kazuyuki Tsutsumi, Hideto Oyama, Hidetaka Kanahashi, Hitoshi Ishida, Daiki Takahashi, Daisuke Matsuwaka
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Publication number: 20160114385Abstract: A continuous casting apparatus continuously casts an ingot formed of titanium or a titanium alloy. The apparatus includes a bottomless mold with a circular cross-sectional shape and a plasma torch. In the bottomless mold, a molten metal is poured from a top opening and the molten metal is solidified and the molten metal solidified is pulled out downward. The plasma torch is disposed on an upper side of the molten metal in the mold and generates a plasma arc that heats the molten metal. A plurality of plasma torches are disposed on the upper side of the molten metal in the mold. The plurality of plasma torches are moved in a horizontal direction above a melt surface of the molten metal along a trajectory keeping a distance not to allow for interference with each other.Type: ApplicationFiled: June 11, 2014Publication date: April 28, 2016Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)Inventors: Eisuke KUROSAWA, Takehiro NAKAOKA, Kazuyuki TSUTSUMI, Hideto OYAMA, Hidetaka KANAHASHI
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Patent number: 9273379Abstract: A titanium alloy product according to the present invention: has a strength level higher than that of an existing titanium alloy product; can be successfully cold rolled (coil rolled); and is also provided with workability. In the titanium alloy product according to the invention, expensive alloy elements are not essentially required, and hence cost can be suppressed. The titanium alloy product according to the invention includes Al equivalent represented by (Al+10O (oxygen)): 3.5 to 7.2% (% by mass, the same hereinafter), Al: more than 1.0% and 4.5% or less, O: 0.60% or less, Fe equivalent represented by (Fe+0.5Cr+0.5Ni+0.67Co+0.67Mn): 0.8% or more and less than 2.0%, and one or more elements selected from the group consisting of Cu: 0.4 to 3.0% and Sn: 0.4 to 10%, in which the balance is Ti and unavoidable impurities.Type: GrantFiled: April 24, 2013Date of Patent: March 1, 2016Assignee: Kobe Steel, Ltd.Inventors: Takashi Konno, Keita Sasaki, Yoshio Itsumi, Hideto Oyama
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Patent number: D757662Type: GrantFiled: August 5, 2014Date of Patent: May 31, 2016Assignee: Kobe Steel, Ltd.Inventors: Yasuyuki Fujii, Akio Okamoto, Yoshio Itsumi, Hideto Oyama, Keitaro Tamura, Kazuki Sakamoto
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Patent number: D763804Type: GrantFiled: August 6, 2014Date of Patent: August 16, 2016Assignee: Kobe Steel, Ltd.Inventors: Kazuki Sakamoto, Akio Okamoto, Yoshio Itsumi, Hideto Oyama, Keitaro Tamura, Yasuyuki Fujii
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Patent number: D776801Type: GrantFiled: December 24, 2014Date of Patent: January 17, 2017Assignee: Kobe Steel, LtdInventors: Keitaro Tamura, Yasuyuki Fujii, Yoshio Itsumi, Hideto Oyama
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Patent number: D799012Type: GrantFiled: December 24, 2014Date of Patent: October 3, 2017Assignee: Kobe Steel, Ltd.Inventors: Keitaro Tamura, Yasuyuki Fujii, Yoshio Itsumi, Hideto Oyama