Patents by Inventor Ren Morinaka
Ren Morinaka 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: 10286501Abstract: The laser welding apparatus includes a welding head and a welding head scanning apparatus. A collimate lens installed on a head body of the welding head is arranged opposite to an end face of optical fibers. The welding head includes only the collimate lens as a lens and the length is shortened. A laser generated by a laser oscillator is introduced into the optical fiber, enters the collimate lens, and then is converted to a parallel beam by the collimate lens. The laser of a parallel beam is irradiated on a surface a welding portion of the welding object through a laser path and the surface of the welding portion is melted. Metallic powder is jetted from powder feed paths formed in a head body to the melted portion and build-up welding is performed on the surface of the welding portion.Type: GrantFiled: August 4, 2014Date of Patent: May 14, 2019Assignee: Hitachi-GE Nuclear Energy, Ltd.Inventors: Koichi Kurosawa, Shinya Ohmori, Ren Morinaka, Kazuhiro Nitta, Yoichi Mahara, Keigo Uchiyama
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Patent number: 9067303Abstract: A chamber having a water jet generation apparatus and a mesh installed inside is pushed against a surface of a peening object. A rotary vane of the water jet generation apparatus, disposed in a region in the chamber between the mesh and the chamber, is rotated to generate a water jet flowing toward the peening object in one region in the chamber, the one region is a region closer to the peening object than the mesh. A plurality of shots 4 put in the region 30A moves toward the peening object along with the water jet and collides with the surface of the peening object. After the collision, the shots move toward the mesh along with the water jet. Compression residual stress is given to the surface of the peening object with which the shots have collided. Thus, spreading of contaminants peeled off from a peening object can be prevented.Type: GrantFiled: June 25, 2013Date of Patent: June 30, 2015Assignee: Hitachi-GE Nuclear Energy, Ltd.Inventors: Hisamitu Hatou, Noboru Saito, Ren Morinaka, Fujio Yoshikubo, Masashi Fukaya, Yuji Matsui, Ryuji Kimura
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Publication number: 20150048059Abstract: The laser welding apparatus includes a welding head and a welding head scanning apparatus. A collimate lens installed on a head body of the welding head is arranged opposite to an end face of optical fibers. The welding head includes only the collimate lens as a lens and the length is shortened. A laser generated by a laser oscillator is introduced into the optical fiber, enters the collimate lens, and then is converted to a parallel beam by the collimate lens. The laser of a parallel beam is irradiated on a surface a welding portion of the welding object through a laser path and the surface of the welding portion is melted. Metallic powder is jetted from powder feed paths formed in a head body to the melted portion and build-up welding is performed on the surface of the welding portion.Type: ApplicationFiled: August 4, 2014Publication date: February 19, 2015Inventors: Koichi KUROSAWA, Shinya OHMORI, Ren MORINAKA, Kazuhiro NITTA, Yoichi MAHARA, Keigo UCHIYAMA
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Publication number: 20140233689Abstract: In a water jet peening apparatus, a high-pressure under-water pump is installed on an upper end of a casing and an injection nozzle drive mechanism equipped with an injection nozzle is attached to the casing. A high-pressure hose whose one end is connected to the high-pressure under-water pump is disposed in the casing and the other end of the high-pressure hose is connected to the injection nozzle. The casing is seated at an upper end of a control rod drive mechanism housing and the high-pressure under-water pump is driven. The high-pressure water pressurized by the high-pressure under-water pump is supplied to the injection nozzle through the high-pressure hose in the casing and is jetted toward the weld portion between the control rod drive mechanism housing and a stub tube. The time required for a water jet peening operation can be shortened.Type: ApplicationFiled: February 14, 2014Publication date: August 21, 2014Applicant: Hitachi-GE Nuclear Energy, Ltd.Inventors: Noboru SAITO, Hisamitsu HATOU, Koichi KUROSAWA, Fujio YOSHIKUBO, Ren MORINAKA, Ryuji KIMURA
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Publication number: 20140000330Abstract: A chamber having a water jet generation apparatus and a mesh installed inside is pushed against a surface of a peening object. A rotary vane of the water jet generation apparatus, disposed in a region in the chamber between the mesh and the chamber, is rotated to generate a water jet flowing toward the peening object in one region in the chamber, the one region is a region closer to the peening object than the mesh. A plurality of shots 4 put in the region 30A moves toward the peening object along with the water jet and collides with the surface of the peening object. After the collision, the shots move toward the mesh along with the water jet. Compression residual stress is given to the surface of the peening object with which the shots have collided. Thus, spreading of contaminants peeled off from a peening object can be prevented.Type: ApplicationFiled: June 25, 2013Publication date: January 2, 2014Inventors: Hisamitu HATOU, Noboru SAITO, Ren MORINAKA, Fujio YOSHIKUBO, Masashi FUKAYA, Yuji MATSUI, Ryuji KIMURA
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Patent number: 7716961Abstract: A method for executing water jet peening for giving an impact force to a surface of a structure member by a crushing pressure of a water jet and cavitation and improving residual stress, or washing, or reforming said surface, wherein said water jet peening is executed so as to make a natural frequency of oscillation of said structure member and a excitation frequency of oscillation of water jet peening different from each other.Type: GrantFiled: August 27, 2008Date of Patent: May 18, 2010Assignee: Hitachi-GE Nuclear Energy, Ltd.Inventors: Hisamitu Hatou, Noboru Saitou, Ren Morinaka, Tomohiko Motoki, Tadashi Iijima, Yuichi Koide, Jun Kashiwakura
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Publication number: 20090056399Abstract: A method for executing water jet peening for giving an impact force to a surface of a structure member by a crushing pressure of a water jet and cavitation and improving residual stress, or washing, or reforming said surface, wherein said water jet peening is executed so as to make a natural frequency of oscillation of said structure member and a excitation frequency of oscillation of water jet peening different from each other.Type: ApplicationFiled: August 27, 2008Publication date: March 5, 2009Inventors: Hisamitu Hatou, Noboru Saitou, Ren Morinaka, Tomohiko Motoki, Tadashi IIjima, Yuichi Koide, Jun Kashiwakura
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Patent number: 6639962Abstract: A preventive maintenance method and apparatus for a structural member in a reactor pressure vessel according to the present invention reduce a tensile residual stress on a surface of the structural member by impinging a water jet from a nozzle onto a plane surface of a deflector to thereby change direction of flow of the water jet, and impinging the water jet after being deflected onto the surface of the structural member. This method and apparatus are applicable to a narrow space portion, and can improve a residual stress on the surface of the structural member and can also prevent damage such as stress corrosion cracking.Type: GrantFiled: January 15, 2002Date of Patent: October 28, 2003Assignees: Hitachi, Ltd., Hitachi Engineering Co., Ltd., Hitachi Ibaraki Business Engineering Co., Ltd.Inventors: Kunio Enomoto, Katsuhiko Hirano, Eisaku Hayashi, Ren Morinaka, Sadato Shimizu, Satoshi Kanno, Shigeru Tanaka, Tetsuya Ishikawa
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Patent number: 6519991Abstract: A water jet peening apparatus which can carry out an efficient peening work on a large-diameter cylindrical structure by injecting a jet stream which contains air bubbles caused by cavitation at a low angle of incidence is provided. The apparatus is comprised of a nozzle which introduces a high pressure water and injects a water jet stream containing air bubbles caused by cavitation at the cylindrical structure disposed in water, wherein the angle of injection of the jet stream is smaller than 45 degrees relative to a tangent of the cylindrical structure.Type: GrantFiled: April 24, 2002Date of Patent: February 18, 2003Assignees: Hitachi, Ltd., Hitachi Kiso Co., Ltd., Hitachi Ibaraki Business Engineering Co., Ltd., Hitachi Engineering Co., Ltd.Inventors: Katsuhiko Hirano, Kunio Enomoto, Eisaku Hayashi, Sadato Shimizu, Ren Morinaka, Tetsuya Ishikawa, Shigeru Tanaka, Noboru Chiba
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Publication number: 20020159558Abstract: A preventive maintenance method and apparatus for a structural member in a reactor pressure vessel according to the present invention reduce a tensile residual stress on a surface of the structural member by impinging a water jet from a nozzle onto a plane surface of a deflector to thereby change direction of flow of the water jet, and impinging the water jet after being deflected onto the surface of the structural member. This method and apparatus are applicable to a narrow space portion, and can improve a residual stress on the surface of the structural member and can also prevent damage such as stress corrosion cracking.Type: ApplicationFiled: January 15, 2002Publication date: October 31, 2002Inventors: Kunio Enomoto, Katsuhiko Hirano, Eisaku Hayashi, Ren Morinaka, Sadato Shimizu, Satoshi Kanno, Shigeru Tanaka, Tetsuya Ishikawa
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Publication number: 20020116970Abstract: A water jet peening apparatus which can carry out an efficient peening work on a large-diameter cylindrical structure by injecting a jet stream which contains air bubbles caused by cavitation at a low angle of incidence is provided. The apparatus is comprised of a nozzle which introduces a high pressure water and injects a water jet stream containing air bubbles caused by cavitation at the cylindrical structure disposed in water, wherein the angle of injection of the jet stream is smaller than 45 degrees relative to a tangent of the cylindrical structure.Type: ApplicationFiled: April 24, 2002Publication date: August 29, 2002Applicant: Hitachi, Ltd.Inventors: Katsuhiko Hirano, Kunio Enomoto, Eisaku Hayashi, Sadato Shimizu, Ren Morinaka, Tetsuya Ishikawa, Shigeru Tanaka, Noboru Chiba
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Patent number: 6425276Abstract: A water jet peening apparatus which can carry out an efficient peening work on a large-diameter cylindrical structure by injecting a jet stream which contains air bubbles caused by cavitation at a low angle of incidence is provided. The apparatus is comprised of a nozzle which introduces a high pressure water and injects a water jet stream containing air bubbles caused by cavitation at the cylindrical structure disposed in water, wherein the angle of injection of the jet stream is smaller than 45 degrees relative to a tangent of the cylindrical structure.Type: GrantFiled: January 21, 2000Date of Patent: July 30, 2002Assignees: Hitachi, Ltd., Hitachi Kiso Co., Ltd., Hitachi Ibaraki Business Engineering Co., Ltd., Hitachi Engineering Co., Ltd.Inventors: Katsuhiko Hirano, Kunio Enomoto, Eisaku Hayashi, Sadato Shimizu, Ren Morinaka, Tetsuya Ishikawa, Shigeru Tanaka, Noboru Chiba
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Patent number: 6345083Abstract: A preventive maintenance method and apparatus for a structural member in a reactor pressure vessel according to the present invention reduce a tensile residual stress on a surface of the structural member by impinging a water jet from a nozzle onto a plane surface of a deflector to thereby change direction of flow of the water jet, and impinging the water jet after being deflected onto the surface of the structural member. This method and apparatus are applicable to a narrow space portion, and can improve a residual stress on the surface of the structural member and can also prevent damage such as stress corrosion cracking.Type: GrantFiled: August 12, 1999Date of Patent: February 5, 2002Assignees: Hitachi, Ltd., Hitachi Engineering Co., Ltd., Hitachi Ibaraki Business Engineering Co., Ltd.Inventors: Kunio Enomoto, Katsuhiko Hirano, Eisaku Hayashi, Ren Morinaka, Sadato Shimizu, Satoshi Kanno, Shigeru Tanaka, Tetsuya Ishikawa
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Patent number: 6341151Abstract: A preventive maintenance method and apparatus for a structural member in a reactor pressure vessel according to the present invention reduce a tensile residual stress on a surface of the structural member by impinging a water jet from a nozzle onto a plane surface of a deflector to thereby change direction of flow of the water jet, and impinging the water jet after being deflected onto the surface of the structural member. This method and apparatus are applicable to a narrow space portion, and can improve a residual stress on the surface of the structural member and can also prevent damage such as stress corrosion cracking.Type: GrantFiled: August 29, 2000Date of Patent: January 22, 2002Assignees: Hitachi, Ltd., Hitachi Engineering Co., Ltd., Hitachi Ibaraki Business Engineering Co., Ltd.Inventors: Kunio Enomoto, Katsuhiko Hirano, Eisaku Hayashi, Ren Morinaka, Sadato Shimizu, Satoshi Kanno, Shigeru Tanaka, Tetsuya Ishikawa
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Patent number: 6240155Abstract: A method of performing maintenance on a structural member inside a reactor pressure vessel includes lowering an annular guide rail having a second lug until the guide rail rests on an upper flange of a core shroud provided inside the reactor pressure vessel, detachably mounting the second lug of the guide rail to a first lug mounted on the core shroud, positioning a discharging nozzle at a position at which compressive remaining stress is added to a surface of the core shroud by moving the discharging nozzle in a radial direction and an axial direction of the core shroud by a discharging nozzle moving apparatus mounted on a turnable revolving on the guide rail and discharging water to add compressive remaining stress to a surface of the core shroud from the discharging nozzle.Type: GrantFiled: August 4, 1999Date of Patent: May 29, 2001Assignees: Hitachi, Ltd., Babcock-Hitachi Kabushiki KaishaInventors: Koichi Kurosawa, Eisaku Hayashi, Sadato Shimizu, Minoru Ootaka, Fujio Yoshikubo, Ren Morinaka, Masayuki Nishino, Noboru Chiba, Kunio Enomoto, Kazunori Sato
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Patent number: 6058153Abstract: A preventive maintenance apparatus for structural members inside a nuclear reactor pressure vessel includes a ring-shaped guide rail having a plurality of lugs which is placed on an upper flange of a core shroud provided inside a reactor pressure vessel. At least some of lugs separately engage with a plurality of guide rods provided on an inner surface of the reactor pressure vessel. A turntable is rotated on the guide rail. A first discharging nozzle moving apparatus placed on the turntable moves a first discharging nozzle for adding compressive remaining stress to an outer surface of the core shroud in a radial direction of the core shroud and in an axial direction of the core shroud. A second discharging nozzle moving apparatus placed on the turntable moves a second discharging nozzle for adding compressive remaining stress to an inner surface of the core shroud in a radial direction of the core shroud and in an axial direction of the core shroud.Type: GrantFiled: February 20, 1998Date of Patent: May 2, 2000Assignees: Hitachi, Ltd., Babcock-Hitachi Kabushiki KaishaInventors: Koichi Kurosawa, Eisaku Hayashi, Sadato Shimizu, Minoru Ootaka, Fujio Yoshikubo, Ren Morinaka, Masayuki Nishino, Noboru Chiba, Kunio Enomoto, Kazunori Sato
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Patent number: 5977515Abstract: An underwater laser processing system has a laser torch; a laser torch driving mechanism for changing a laser emission position of the laser torch; and a chamber with one end opened to an external environment, which contains the laser torch; wherein a partitioning wall for preventing permeation of water is provided between a free end of the chamber and the laser torch. The system is used for detecting a sensitized portion and repairing it at one time using a sensitization detecting arrangement. Moreover, it is used for forming an alloying layer by melting a sprayed coating film, and for forming a new surface layer by emitting a laser beam through a solution containing a metal component.Type: GrantFiled: October 4, 1995Date of Patent: November 2, 1999Assignee: Hitachi, Ltd.Inventors: Keiichi Uraki, Toshitaka Satsuta, Akira Onuma, Mitsuo Nakamura, Tsutomu Onuma, Toshimi Matsumoto, Yasumasa Tamai, Hiroshi Yamauchi, Eisaku Hayashi, Ren Morinaka
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Patent number: 5897062Abstract: A fluid jet nozzle has a water chamber accommodating therein pressurized fluid, an orifice communicating with the water chamber and contracting the fluid from the water chamber, a throat communicating with the orifice and through which the fluid from the orifice passes, a multiplication chamber communicating with the throat and receiving the fluid from the throat for multiplying cavitation, and a diffusion chamber receiving the fluid from the multiplication chamber for diffusing the fluid.Type: GrantFiled: October 18, 1996Date of Patent: April 27, 1999Assignees: Hitachi, Ltd., Babcock-Hitachi Kabushiki KaisyaInventors: Kunio Enomoto, Katsuhiko Hirano, Masahiro Otaka, Kazuo Amano, Eisaku Hayashi, Sadato Shimizu, Ren Morinaka, Kazunori Sato
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Patent number: 5793203Abstract: A measurement system for measuring material deterioration in accordance with a magnetic field of the material in the presence of radiation. The measurement system includes a detection circuit which detects a magnetic field of the material and generates a signal indicative thereof which signal includes noise due to the radiation, a signal processing circuit including semiconductor devices to process the signal generated from the detection circuit and a noise reducing circuit for at least reducing noise in the generated signal which is due to the radiation. The signal processing circuit is installed at a place where a dose equivalent of radiation is equal to or smaller than that of a place where the detection circuit is installed.Type: GrantFiled: December 5, 1995Date of Patent: August 11, 1998Assignee: Hitachi, Ltd.Inventors: Eriko Takeda, Toshikazu Nishino, Masahiro Otaka, Ren Morinaka, Fuminobu Takahashi
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Patent number: 5749384Abstract: An apparatus preventive maintenance having a driving mechanism capable of driving a jet nozzle 24 to cause it to travel upward-and-downward, to rotate and to swing is settled on the top of a housing in the bottom portion of a reactor pressure vessel and on a hole for a fuel support piece, water pumped by a high pressure pump is spouted from a jet nozzle, and cavitation bubbles generated during the spouting are supplied to the positions to be treated for preventive maintenance, such as housings in the bottom portion of the reactor pressure vessel. Therewith, the residual tensile stress in the position to be treated is improved in a releasing direction by the energy generated by the collapsing of the cavitation bubbles.Type: GrantFiled: March 24, 1995Date of Patent: May 12, 1998Assignees: Hitachi, Ltd., Babcock-Hitachi Kabushiki Kaisha, Hitachi Nuclear Engineering Co., Ltd., Hitachi Kiso Co., Ltd.Inventors: Eisaku Hayashi, Koichi Kurosawa, Fujio Yoshikubo, Hideyasu Furukawa, Ren Morinaka, Kunio Enomoto, Masahiro Otaka, Noboru Chiba, Kazunori Sato