Patents by Inventor Shuho Tsubota
Shuho Tsubota 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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Publication number: 20130306609Abstract: A laser cutting apparatus (10) includes a laser processing head (15) that receives a laser beam emitted by a laser oscillator (12) and that uses a spherical lens for converging the laser beam so as to cause the intensity distribution of the laser beam to have a caldera-like shape, in which the intensity of the laser beam is higher in a peripheral area than in a central area, at the position of a workpiece (20). Moreover, the laser processing head (15) radiates the laser beam whose focal position is displaced from the position of the workpiece (20) to the workpiece (20). Therefore, the laser cutting apparatus (10) performs an inversion on the laser beam by using the spherical aberration of the spherical lens. Consequently, with a simple configuration, a laser beam whose inner area and outer area are inverted at the position of the workpiece (2) can be generated, and the processing direction for processing the workpiece (20) is not limited.Type: ApplicationFiled: May 30, 2011Publication date: November 21, 2013Inventors: Masao Watanabe, Shuho Tsubota
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Publication number: 20130026142Abstract: A welding equipment that forms an end part includes a vacuum chamber; a holding member that is installed in the vacuum chamber and that holds the end part in which a welding groove is formed by placing a half cell, an end plate, and a beam pipe next to each other; a window that is installed in a top-end surface portion of the vacuum chamber, which intersects with an axial center of the end part, and that forms a portion thereof; a laser radiating head that is installed outside the vacuum chamber and that radiates a laser beam into an internal space of the end part through the window; and a mirror member that is installed in the internal space of the end part and that adjusts a reflected laser beam, formed by reflecting the laser beam, so as to be oriented perpendicular to the welding groove.Type: ApplicationFiled: May 10, 2011Publication date: January 31, 2013Inventors: Katsuya Sennyu, Shuho Tsubota, Fumiaki Inoue
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Patent number: 8362393Abstract: An object is to provide a method and an apparatus for improving a residual stress in a tubular body, which are enabled to improve the residual stress reliably by clearly defining controlling rage for treatment conditions without depending on an installation state and configuration of the tubular body. When an outer-circumferential surface of a welded portion of a cylindrical tubular body (2) is irradiated with a laser beam that circles around an outer circumference of the tubular body (2), a heating width W in a circumferential direction heated by the laser-beam irradiation and a laser-beam moving speed V in the circumferential direction are set so that a stress in the circumferential direction in an inner surface of the tubular body (2) produced by the heating with the laser beam is at least larger than a yielding stress of a material that the tubular body (2) is made of.Type: GrantFiled: April 20, 2007Date of Patent: January 29, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Takahiro Ota, Shuho Tsubota, Takashi Ishide, Kazuhiko Kamo, Noriaki Sugimoto, Yoshiyuki Hemmi, Hironori Onitsuka, Takashi Akaba
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Patent number: 8362389Abstract: Aims are to provide a tubular-body residual-stress improving apparatus and an adjustment method thereof capable of adjusting irradiation position with favorable reproducibility, even when an optical fiber is eccentric. In the tubular-body residual-stress improving apparatus, an optical control unit (5) includes a rotational hold mechanism (9) for holding an optical fiber (6) in a manner that the optical fiber (6) is rotatable in a circumferential direction of the optical fiber (6), and, if a position of an intensity peak of the laser beam from the optical fiber (6) in an axial direction of the tubular body (2) is offset from the center of an irradiation profile, a position at which the optical fiber (6) is held in the circumferential direction is adjusted by the rotational hold mechanism (9) so as to eliminate the offset or to minimize an influence of the offset.Type: GrantFiled: May 30, 2008Date of Patent: January 29, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Shuho Tsubota, Takashi Ishide, Takashi Akaba, Hironori Onitsuka, Kenichi Kawanishi
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Publication number: 20120256563Abstract: Provided is a welding method of welding a cylindrical stiffening member to an outer circumference of a superconducting accelerator tube body using a laser beam in a process of manufacturing a superconducting accelerator tube. The laser beam is configured such that a distribution profile of energy density on an irradiated face to which the laser beam is irradiated is a Gaussian distribution profile having a peak section, and the energy density of the peak section is 5.8×105 W/cm2 or more.Type: ApplicationFiled: February 10, 2011Publication date: October 11, 2012Inventors: Shuho Tsubota, Katsuya Sennyu, Fumiaki Inoue
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Patent number: 8044323Abstract: A weld zone of T-piping and its neighborhood are efficiently laser-heated to remove residual stress. For this purpose, the weld zone of a T-piping (50) is irradiated and heated with a laser beam emitted from a laser head (10) to remove residual stress. At this time, a rotating travel cart (3) travels along a ring rail (2) to adjust the position of the laser head (10) in a ?-direction, a vertical slide (4) slides to adjust the position of the laser head (10) in a Z-direction, a radial slide (5) slides to adjust the position of the laser head (10) in an L-direction, an arcuate piece slide (7) slides along an arcuate piece to adjust the ?-direction of the laser head (10), a laser head support portion (9) turns to adjust the ?-direction of the laser head (10), and oscillation adjusts the position of the laser head (10) in a ?-direction.Type: GrantFiled: July 28, 2005Date of Patent: October 25, 2011Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Takashi Akaba, Shuho Tsubota, Kenji Nishikawa, Noriaki Sugimoto, Shoji Kushimoto, Takashi Ishide, Takahiro Ohta
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Publication number: 20100122972Abstract: Aims are to provide a tubular-body residual-stress improving apparatus and an adjustment method thereof capable of adjusting irradiation position with favorable reproducibility, even when an optical fiber is eccentric. In the tubular-body residual-stress improving apparatus, an optical control unit (5) includes a rotational hold mechanism (9) for holding an optical fiber (6) in a manner that the optical fiber (6) is rotatable in a circumferential direction of the optical fiber (6), and, if a position of an intensity peak of the laser beam from the optical fiber (6) in an axial direction of the tubular body (2) is offset from the center of an irradiation profile, a position at which the optical fiber (6) is held in the circumferential direction is adjusted by the rotational hold mechanism (9) so as to eliminate the offset or to minimize an influence of the offset.Type: ApplicationFiled: May 30, 2008Publication date: May 20, 2010Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Shuho Tsubota, Takashi Ishide, Takashi Akaba, Hironori Onitsuka, Kenichi Kawanishi
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Publication number: 20100108653Abstract: An object is to provide a method and an apparatus for improving a residual stress in a tubular body, which are enabled to improve the residual stress reliably by clearly defining controlling rage for treatment conditions without depending on an installation state and configuration of the tubular body. When an outer-circumferential surface of a welded portion of a cylindrical tubular body (2) is irradiated with a laser beam that circles around an outer circumference of the tubular body (2), a heating width W in a circumferential direction heated by the laser-beam irradiation and a laser-beam moving speed V in the circumferential direction are set so that a stress in the circumferential direction in an inner surface of the tubular body (2) produced by the heating with the laser beam is at least larger than a yielding stress of a material that the tubular body (2) is made of.Type: ApplicationFiled: April 20, 2008Publication date: May 6, 2010Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Takahiro Ota, Shuho Tsubota, Takashi Ishide, Kazuhiko Kamo, Noriaki Sugimoto, Yoshiyuki Hemmi, Hironori Onitsuka, Takashi Akaba
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Publication number: 20100059491Abstract: An aim is to provide a tubular-body residual-stress improving apparatus capable of reducing irradiation on unnecessary areas by controlling the optical paths of laser beams. In the tubular-body residual-stress improving apparatus, an optical control unit (5C) includes one pair of mirrors (21, 22) being disposed at a final stage of an optical system for a plurality of laser beams (P1-Pn) to be sharable and disposed in such a way that the mirrors are placed respectively at both sides, in the circumferential direction of the tubular body (2), of a final optical path of the laser beams to the tubular body (2), and another pair of mirrors (23, 24) being disposed at final stage of the optical system for the laser beams at both ends and disposed in such a way that the mirrors are placed respectively at both sides, in an axial direction of the tubular body (2), of final optical paths of the laser beams at both ends to the tubular body (2).Type: ApplicationFiled: March 26, 2008Publication date: March 11, 2010Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Shuho Tsubota, Takashi Ishide, Takashi Akaba, Hironori Onitsuka
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Publication number: 20090302012Abstract: An object is to provide a method and a system for improving a residual stress in a tube body, with which the residual stress can reliably be improved without heating excessively. From an irradiation start angle ?s to a first predetermined angle ?1 on the tube body, an intensity of a laser beam is gradually increased from 0.5 to the steady output of 1.0 output ratio; from the first predetermined angle ?1 to a second predetermined angle ?2, the intensity of the laser beam is set at 1.0 output ratio; from the second predetermined angle ?2 to an irradiation end angle ?e, the intensity of the laser beam is gradually decreased from the 1.0 output ratio to 0.5; and at the irradiation end angle ?e, the intensity of the laser beam is set to 0. All these steps are performed at one turn of rotation in the method and the system for improving residual stress in the tube body.Type: ApplicationFiled: March 29, 2007Publication date: December 10, 2009Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Takahiro Ota, Yoshiyuki Hemmi, Hironori Onitsuka, Noriaki Sugimoto, Kazuhiko Kamo, Shuho Tsubota, Itaru Muroya
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Patent number: 7485828Abstract: A residual stress improving apparatus for piping, which can heat an outer peripheral surface of piping to reduce (including eliminate) the residual stress of the piping is provided. The apparatus has a laser head portion, and circumferential direction moving mechanism composed of a ring rail and a rotational travel bogie. Further, the apparatus may adjust the reflection direction of laser light so that the laser light reflected by the outer peripheral surface of the piping does not return to the laser head, and adjust the delivery direction of the laser light so that the outer peripheral surface of the bending pipe portion located forwardly, in the pipe axis direction, of the laser head is irradiated with the laser light.Type: GrantFiled: July 28, 2005Date of Patent: February 3, 2009Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Takashi Akaba, Shuho Tsubota, Kenji Nishikawa, Noriaki Sugimoto, Shoji Kushimoto, Takashi Ishide, Takahiro Ohta
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Publication number: 20070181541Abstract: A residual stress improving apparatus for piping, which can heat an outer peripheral surface of piping to reduce (including eliminate) the residual stress of the piping, whose apparatus configuration is relatively compact, and which can also heat the outer peripheral surface of a bending pipe portion, is provided. For this purpose, the apparatus has a laser head portion 6, and circumferential direction moving means composed of a ring rail 3 and a rotational travel bogie 5.Type: ApplicationFiled: July 28, 2005Publication date: August 9, 2007Applicant: MITSUBISHI HEAVY INDUSTRIES, LTDInventors: Takashi Akaba, Shuho Tsubota, Kenji Nishikawa, Noriaki Sugimoto, Shoji Kushimoto, Takashi Ishide, Takahiro Ohta
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Publication number: 20070175873Abstract: A weld zone of T-piping and its neighborhood are efficiently laser-heated to remove residual stress. For this purpose, the weld zone of a T-piping (50) is irradiated and heated with a laser beam emitted from a laser head (10) to remove residual stress. At this time, a rotating travel cart (3) travels along a ring rail (2) to adjust the position of the laser head (10) in a ?-direction, a vertical slide (4) slides to adjust the position of the laser head (10) in a Z-direction, a radial slide (5) slides to adjust the position of the laser head (10) in an L-direction, an arcuate piece slide (7) slides along an arcuate piece to adjust the ?-direction of the laser head (10), a laser head support portion (9) turns to adjust the ?-direction of the laser head (10), and oscillation adjusts the position of the laser head (10) in a ?-direction.Type: ApplicationFiled: July 28, 2005Publication date: August 2, 2007Applicant: MITSHBISHI HEAVY INDUSTRIES LTD.,Inventors: Takashi Akaba, Shuho Tsubota, Kenji Nishikawa, Noriaki Sugimoto, Shoji Kushimoto, Takashi Ishide, Takahiro Ohta