Patents by Inventor Yutaka Yanagawa

Yutaka Yanagawa 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).

  • Publication number: 20210039207
    Abstract: A flux-free brazing aluminum alloy brazing sheet includes: a core material formed of aluminum alloy comprising Si of 0.50 to 0.90 mass %, Cu of 0.30 to 2.50 mass %, and Mn of 1.40 to 1.80 mass %, with a Mg content limited to 0.05 mass % or less, and with the balance being Al and inevitable impurities; an intermediate material being formed of aluminum alloy comprising Mg of 0.40 to 1.00 mass %, and Zn of 2.00 to 6.00 mass %, with the balance being Al and inevitable impurities; and a brazing material being formed of aluminum alloy comprising Si of 6.00 to 13.00 mass %, Mg of 0.05 to 0.40 mass %, and Bi of 0.010 to 0.050 mass %, with the balance being Al and inevitable impurities.
    Type: Application
    Filed: March 5, 2019
    Publication date: February 11, 2021
    Applicants: UACJ Corporation, DENSO CORPORATION
    Inventors: Tatsuya Ide, Yutaka Yanagawa, Shogo Yamada, Takahiro Shinoda, Shingo Ono
  • Publication number: 20210031289
    Abstract: A brazing method for brazing a material without using a flux includes performing brazing in an inert gas atmosphere, in a state in which the material to be brazed is covered with a cover member formed of an upper cover portion covering the whole upper portion of the material to be brazed and side cover portions covering at least some of the side portions of the material to be brazed, with the upper cover portion contacting the upper portion of the material to be brazed, and the material to be brazed and the cover member are held with a heat transmission promoting member formed of an upper heat transmission promoting portion and a lower heat transmission promoting portion, with the upper heat transmission promoting portion contacting the upper cover portion, and with the lower heat transmission promoting portion contacting the lower portion of the material to be brazed.
    Type: Application
    Filed: January 30, 2019
    Publication date: February 4, 2021
    Applicant: UACJ Corporation
    Inventor: Yutaka Yanagawa
  • Publication number: 20200370847
    Abstract: A method for manufacturing a heat exchanger (1) includes joining an inner fin (3) to a hollow structure (20) formed from at least two clad plates (200a, 200b) by heating and brazing a filler metal layer (B). Each clad plate has a core layer (A) composed of an aluminum alloy that contains Mg: 0.40-1.0 mass %. The filler metal layer is composed of an aluminum alloy that contains Si: 4.0-13.0 mass %, and further contains Li: 0.0040-0.10 mass %, Be: 0.0040-0.10 mass %, and/or Bi: 0.01-0.30 mass %. The inner fin is composed of an aluminum alloy that contains Si: 0.30-0.70 mass % and Mg: 0.35-0.80 mass %. A flux (F) that contains cesium (Cs) is applied along a contact part (201), and the vicinity thereof, of the at least two clad plates prior to the heating. A heat exchanger (1) may be manufactured according to this method.
    Type: Application
    Filed: August 10, 2020
    Publication date: November 26, 2020
    Inventors: Yutaka YANAGAWA, Norihisa ISOMURA, Yuki TOTANI, Yasuhiro YAGITA, Tetsuro HATA
  • Patent number: 10682730
    Abstract: An aluminum alloy brazing sheet used for brazing aluminum, without using a flux, in an inert gas atmosphere or vacuum is formed by arranging a brazing material on one side or both sides of a core material made of pure aluminum or aluminum alloy, the brazing material including 6% to 13% by mass of Si and the balance being Al and inevitable impurities, and performing cladding with an intermediate material interposed between the core material and the brazing material, the intermediate material including 0.01% to 1.5% by mass of Bi, 1.5% to 13% by mass of Si, and the balance being Al and inevitable impurities, the intermediate material having a thickness of 2% to 35% of a thickness of the brazing material, wherein one or both of the intermediate material and the core material includes 0.4% to 6% by mass of Mg.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: June 16, 2020
    Assignee: UACJ CORPORATION
    Inventors: Yasunaga Itoh, Tomoki Yamayoshi, Yutaka Yanagawa
  • Patent number: 10661395
    Abstract: A brazing sheet for brazing in an inert-gas atmosphere without using a flux has a core and a filler material clad to one side or both sides of the core. The core has a chemical composition that contains Mg: 0.35-0.8% (mass %; likewise hereinbelow), the remainder being composed of Al and unavoidable impurities. The filler material has a chemical composition that contains Si: 6-13% and Bi: 0.001-0.05% and Mg: limited less than 0.05%, the remainder being composed of Al and unavoidable impurities.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: May 26, 2020
    Assignee: UACJ CORPORATION
    Inventors: Junichi Ichikawa, Tomoki Yamayoshi, Yasunaga Itoh, Yutaka Yanagawa
  • Patent number: 10150186
    Abstract: A hollow aluminum structure that will be brazed includes at least one brazing sheet having a filler metal layer clad onto a core layer. The core layer is composed of aluminum or an aluminum alloy containing less than 0.2 mass % Mg. The filler metal layer is composed of an aluminum alloy that contains Si: 4.0-13.0 mass % and Bi: 0.01-0.3 mass %, and further contains Li: 0.004-0.08 mass % and/or Be: 0.006-0.12 mass %, the filler metal layer containing less than 0.1 mass % Mg. The hollow aluminum structure is assembled such that the filler metal layer is present at locations that will form both an interior-facing brazed joint and an exterior-facing brazed joint. Then, flux is applied onto the filler metal layer at the location that will form the exterior brazed joint, and the hollow aluminum structure heated in an inert gas atmosphere to form the interior brazed joint and the exterior brazed joint.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: December 11, 2018
    Assignee: UACJ CORPORATION
    Inventors: Yutaka Yanagawa, Yasunaga Itoh, Tomoki Yamayoshi
  • Publication number: 20180290245
    Abstract: An aluminum alloy clad material includes a core material that is made of an aluminum alloy containing Mg at a concentration of 0.2 to 2.0% (mass %; the same applies below), with the balance being Al and unavoidable impurities, and has one side or two sides cladded with a surface-layer material made of pure aluminum containing Mg having a limited concentration of lower than 0.1%. In addition, an aluminum alloy clad material includes a core material that is made of aluminum or an aluminum alloy, and has one side or two sides cladded with a surface-layer material made of pure aluminum containing Mg having a limited concentration of lower than 0.1%, via an interlayer material made of an aluminum alloy containing Mg at a concentration of 0.3 to 2.0%, with the balance being Al and unavoidable impurities.
    Type: Application
    Filed: May 23, 2016
    Publication date: October 11, 2018
    Applicant: UACJ Corporation
    Inventors: Yasunaga Itoh, Shoichi Sakoda, Tomoki Yamayoshi, Yutaka Yanagawa
  • Publication number: 20180214964
    Abstract: A brazing method includes shaping a clad sheet to form a hollow structure. A tube is then partially inserted into a through hole in the hollow structure, thereby forming an assembled aluminum structure. The exterior surface of the hollow structure adjacent the through hole is composed of an Al—Si alloy that serves as a first filler material. The interior surface of the hollow structure adjacent the through hole is composed of an Al—Si alloy containing at least one of Cu and Zn and having a solidus temperature of 570° C. or less that serves as a second filler material. The assembled aluminum structure is brazed by heating it in an inert-gas atmosphere such that fillets joining the hollow structure to the tube along the through hole are formed first on the interior surface of the hollow structure and then on the exterior surface of the hollow structure.
    Type: Application
    Filed: May 18, 2016
    Publication date: August 2, 2018
    Inventors: Yasunaga ITOH, Yutaka YANAGAWA, Tomoki YAMAYOSHI, Junji NINOMIYA, Tsubasa YANAGIMOTO
  • Publication number: 20180200841
    Abstract: A brazing sheet used for brazing aluminum in an inert gas atmosphere or vacuum is formed by arranging a brazing material on one side or both sides of a core material made of pure aluminum or aluminum alloy, and performing cladding with an intermediate material interposed between the core material and the brazing material. The brazing material includes 6% to 13% of Si and the balance being Al and inevitable impurities. The intermediate material includes 0.01% to 1.5% of Bi, at least one of 0.05% or more of Li, 0.05% or more of Be, 0.05% or more of Ba, and 0.05% or more of Ca, and the balance being Al and inevitable impurities. By promptly supplying Bi and Li, Be, Ca, and/or Mg into the brazing material during brazing heating, these elements are eluted in the molten brazing material, embrittling the oxide film on the surface of the brazing material.
    Type: Application
    Filed: June 29, 2016
    Publication date: July 19, 2018
    Applicant: UACJ Corporation
    Inventors: Yasunaga Itoh, Tomoki Yamayoshi, Yutaka Yanagawa
  • Publication number: 20180200842
    Abstract: An aluminum alloy brazing sheet used for brazing aluminum, without using a flux, in an inert gas atmosphere or vacuum is formed by arranging a brazing material on one side or both sides of a core material made of pure aluminum or aluminum alloy, the brazing material including 6% to 13% by mass of Si and the balance being Al and inevitable impurities, and performing cladding with an intermediate material interposed between the core material and the brazing material, the intermediate material including 0.01% to 1.5% by mass of Bi, 1.5% to 13% by mass of Si, and the balance being Al and inevitable impurities, the intermediate material having a thickness of 2% to 35% of a thickness of the brazing material, wherein one or both of the intermediate material and the core material includes 0.4% to 6% by mass of Mg.
    Type: Application
    Filed: June 29, 2016
    Publication date: July 19, 2018
    Applicant: UACJ Corporation
    Inventors: Yasunaga ITOH, Tomoki YAMAYOSHI, Yutaka YANAGAWA
  • Patent number: 9976200
    Abstract: A highly corrosion resistant and highly formable cladded aluminum-alloy material, a method for producing the same, a heat exchanger using the same and a method for producing the same are shown. The present cladded aluminum-alloy material has an aluminum alloy core material, an intermediate layer material clad on one surface of the core material and a brazing filler metal clad on the intermediate layer material surface which is not at the core material side, wherein a crystal grain size of the intermediate layer material before brazing heating is 60 ?m or more, and in a cross section of the core material in a rolling direction before brazing heating, when R1 (?m) represents the crystal grain size in a plate thickness direction, and R2 (?m) represents the crystal grain size in the rolling direction, R1/R2 is 0.30 or less.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: May 22, 2018
    Assignee: UACJ Corporation
    Inventors: Makoto Ando, Yutaka Yanagawa, Akio Niikura
  • Publication number: 20180133845
    Abstract: A brazing method includes shaping a clad plate to form a hollow structure. The clad plate has at least one layer containing an element that breaks down an oxide film when heated. A tube is then partially inserted into a through hole in the hollow structure, thereby forming an assembled aluminum structure. The exterior surface of the hollow structure adjacent the through hole is composed of an Al—Si alloy that serves as a filler-material layer. The exterior surface of the tube that opposes the through hole of the hollow structure is composed of aluminum or an aluminum alloy that does not function as a filler when brazed. The assembled aluminum structure is brazed by heating it and then cooling it in an inert-gas atmosphere such that the filler-material layer of the clad plate flows and forms a fillet joining the hollow structure to the tube along the through hole.
    Type: Application
    Filed: May 18, 2016
    Publication date: May 17, 2018
    Inventors: Yasunaga ITOH, Yutaka YANAGAWA, Tomoki YAMAYOSHI, Junji NINOMIYA, Tsubasa YANAGIMOTO
  • Publication number: 20180093355
    Abstract: An aluminum heat exchanger is made by disposing an inner fin in a closed space formed by overlapping edge portions of a formed single tube plate or a plurality of formed tube plates, and brazing a first joint obtained by overlapping the edge portions of the tube plate and a second joint obtained by causing the inner fin to abut against the tube plate, wherein an Al—Si-based brazing filler material is interposed at the first and second joints, and brazing is carried out in an inert gas atmosphere without using flux, wherein the inner fin is constituted of a brazing sheet obtained by cladding a core material of an aluminum alloy, on both surfaces thereof, with the Al—Si-based brazing filler material having a solidus temperature of 570° C. or lower, the solidus temperature being lower than a solidus temperature of the Al—Si-based brazing filler material interposed at the first joint.
    Type: Application
    Filed: April 18, 2016
    Publication date: April 5, 2018
    Applicants: DENSO CORPORATION, UACJ CORPORATION
    Inventors: Hideaki Sato, Eizo Takahashi, Yasunaga Itoh, Yutaka Yanagawa, Tomoki Yamayoshi
  • Publication number: 20170320170
    Abstract: A hollow aluminum structure that will be brazed includes at least one brazing sheet having a filler metal layer clad onto a core layer. The core layer is composed of aluminum or an aluminum alloy containing less than 0.2 mass % Mg. The filler metal layer is composed of an aluminum alloy that contains Si: 4.0-13.0 mass % and Bi: 0.01-0.3 mass %, and further contains Li: 0.004-0.08 mass % and/or Be: 0.006-0.12 mass %, the filler metal layer containing less than 0.1 mass % Mg. The hollow aluminum structure is assembled such that the filler metal layer is present at locations that will form both an interior-facing brazed joint and an exterior-facing brazed joint. Then, flux is applied onto the filler metal layer at the location that will form the exterior brazed joint, and the hollow aluminum structure heated in an inert gas atmosphere to form the interior brazed joint and the exterior brazed joint.
    Type: Application
    Filed: November 13, 2015
    Publication date: November 9, 2017
    Inventors: Yutaka YANAGAWA, Yasunaga ITOH, Tomoki YAMAYOSHI
  • Publication number: 20170282271
    Abstract: A brazing furnace (1) includes a preheating chamber (2) and a brazing chamber (3). The preheating chamber (2) includes: a vacuum pump (21) for reducing the pressure inside the preheating chamber (2) while a material to be processed (100) is housed therein; a preheating apparatus (22), which preheats the material to be processed (100) in a reduced-pressure atmosphere; and a gas introducing apparatus (23), which introduces inert gas into the preheating chamber (2) to restore the pressure inside the preheating chamber (2) after the preheating. The brazing chamber (3) includes: a gas-replacing apparatus (31), which introduces inert gas into the brazing chamber (3); and a main heating apparatus (32), which heats the material to be processed (100) to a brazing temperature while it is housed in the brazing chamber (3).
    Type: Application
    Filed: July 17, 2015
    Publication date: October 5, 2017
    Inventors: Yasunaga ITOH, Yutaka YANAGAWA, Shoichi SAKODA
  • Publication number: 20170205160
    Abstract: A method for manufacturing a heat exchanger (1) includes joining an inner fin (3) to a hollow structure (20) formed from at least two clad plates (200a, 200b) by heating and brazing a filler metal layer (B). Each clad plate has a core layer (A) composed of an aluminum alloy that contains Mg: 0.40-1.0 mass %. The filler metal layer is composed of an aluminum alloy that contains Si: 4.0-13.0 mass %, and further contains Li: 0.0040-0.10 mass %, Be: 0.0040-0.10 mass %, and/or Bi: 0.01-0.30 mass %. The inner fin is composed of an aluminum alloy that contains Si: 0.30-0.70 mass % and Mg: 0.35-0.80 mass %. A flux (F) that contains cesium (Cs) is applied along a contact part (201), and the vicinity thereof, of the at least two clad plates prior to the heating. A heat exchanger (1) may be manufactured according to this method.
    Type: Application
    Filed: December 20, 2016
    Publication date: July 20, 2017
    Inventors: Yutaka YANAGAWA, Norihisa ISOMURA, Yuki TOTANI, Yasuhiro YAGITA, Tetsuro HATA
  • Publication number: 20170151637
    Abstract: A brazing sheet for brazing in an inert-gas atmosphere without using a flux has a core and a filler material clad to one side or both sides of the core. The core has a chemical composition that contains Mg: 0.35-0.8% (mass %; likewise hereinbelow), the remainder being composed of Al and unavoidable impurities. The filler material has a chemical composition that contains Si: 6-13% and Bi: 0.001-0.05% and Mg: limited less than 0.05%, the remainder being composed of Al and unavoidable impurities.
    Type: Application
    Filed: July 29, 2015
    Publication date: June 1, 2017
    Inventors: Junichi ICHIKAWA, Tomoki YAMAYOSHI, Yasunaga ITOH, Yutaka YANAGAWA
  • Publication number: 20160319399
    Abstract: A highly corrosion resistant and highly formable cladded aluminum-alloy material, a method for producing the same, a heat exchanger using the same and a method for producing the same are shown. The present cladded aluminum-alloy material has an aluminum alloy core material, an intermediate layer material clad on one surface of the core material and a brazing filler metal clad on the intermediate layer material surface which is not at the core material side, wherein a crystal grain size of the intermediate layer material before brazing heating is 60 ?m or more, and in a cross section of the core material in a rolling direction before brazing heating, when R1 (?m) represents the crystal grain size in a plate thickness direction, and R2 (?m) represents the crystal grain size in the rolling direction, R1/R2 is 0.30 or less.
    Type: Application
    Filed: December 17, 2014
    Publication date: November 3, 2016
    Applicant: UACJ Corporation
    Inventors: Makoto ANDO, Yutaka YANAGAWA, Akio NIIKURA
  • Patent number: 9216468
    Abstract: Provided are: a method for brazing an aluminum alloy, which is characterized in that brazing is carried out by heating an aluminum brazing sheet without using flux in a furnace that is in an argon gas-containing atmosphere, said aluminum brazing sheet comprising a core material that is composed of aluminum or an aluminum alloy and a brazing filler material that is composed of an aluminum alloy and clad on one surface or both surfaces of the core material, and said core material and/or said brazing filler material containing Mg; and a brazing apparatus which is used in the method for brazing an aluminum alloy. The brazing method has good and stable brazing properties and is applicable in industrial practice.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: December 22, 2015
    Assignees: Kanto Yakin Kogyo Co., Ltd., Furukawa-Sky Aluminum Corp.
    Inventors: Kiichi Kanda, Kenichi Watanabe, Yutaka Yanagawa
  • Publication number: 20140315042
    Abstract: A brazing sheet for flux-free brazing, comprising a core material, a brazing material disposed on at least one surface of the core material, and a thin skin material disposed on the brazing material, wherein the core material is made of an aluminum alloy having a higher melting point than that of the brazing material; the brazing material is made of an Al—Si—Mg based alloy and has a thickness of 25 to 250 ?m; the thin skin material is made of an aluminum alloy having a higher melting initiation temperature than the brazing material and containing substantially no Mg, and has a thickness of 5 to 30 ?m; and a content of an oxide existing at an interface between the brazing material and the thin skin material is 0.1 ppm or less in weight ratio with respect to the entire clad material. The present invention provides a brazing sheet for flux-free brazing, which has a thin skin material, with uniform brazing characteristics, and enables stable joining.
    Type: Application
    Filed: January 11, 2013
    Publication date: October 23, 2014
    Applicant: UACJ Corporation
    Inventors: Yoshikazu Suzuki, Akihito Gotou, Yutaka Yanagawa