Patents by Inventor Shigeto Sakashita
Shigeto Sakashita 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: 11486531Abstract: Provided is a thermal-insulated multi-walled pipe for superconducting power transmission that highly prevents intrusion of external heat due to radiation and has excellent thermal insulation property without using a superinsulation. A thermal-insulated multi-walled pipe for superconducting power transmission comprises: a superconducting cable; and a multi-walled pipe that houses the superconducting cable, wherein the multi-walled pipe is composed of a plurality of straight pipes, and at least one of the plurality of straight pipes has, at a surface thereof, a zinc or zinc alloy-plated layer having an average spangle size of 2.0 mm or less.Type: GrantFiled: May 29, 2018Date of Patent: November 1, 2022Assignee: JFE STEEL CORPORATIONInventors: Yasuhide Ishiguro, Akio Sato, Shigeto Sakashita
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Patent number: 11075508Abstract: A thermal-insulated multi-walled pipe for superconducting power transmission comprises: a superconducting cable; a multi-walled pipe composed of a plurality of straight pipes and houses the superconducting cable; and a plurality of spacers that are located between adjacent two straight pipes of the plurality of straight pipes, wherein a cross-sectional shape of each spacer is a polygon having three or more vertices, each spacer has a through-hole at a center in the plane, an inner straight pipe is located to pass through the through-hole, a frictional coefficient ?i between each spacer and the inner straight pipe is 0.1 or less, a frictional coefficient ?o between each spacer and an outer straight pipe is 0.1 or less, and a ratio Ld/d of a diagonal equivalent length Ld of the polygon to an inner diameter d of the outer straight pipe of the adjacent two straight pipes is 0.9 or less.Type: GrantFiled: May 29, 2018Date of Patent: July 27, 2021Assignee: JFE STEEL CORPORATIONInventors: Yasuhide Ishiguro, Akio Sato, Shigeto Sakashita
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Patent number: 10971286Abstract: Provided is a thermal-insulated multi-walled pipe for superconducting power transmission that highly prevents intrusion of external heat due to radiation and has excellent thermal insulation property without using a superinsulation and can be produced easily. A thermal-insulated multi-walled pipe for superconducting power transmission comprises: a superconducting cable; and a multi-walled pipe that houses the superconducting cable, wherein the multi-walled pipe is composed of a plurality of straight pipes, and at least one of the plurality of straight pipes has, at a surface thereof, a coating layer containing a metal powder.Type: GrantFiled: May 29, 2018Date of Patent: April 6, 2021Assignee: JFE STEEL CORPORATIONInventors: Yasuhide Ishiguro, Akio Sato, Shigeto Sakashita
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Publication number: 20200220340Abstract: A thermal-insulated multi-walled pipe for superconducting power transmission comprises: a superconducting cable; a multi-walled pipe composed of a plurality of straight pipes and houses the superconducting cable; and a plurality of spacers that are located between adjacent two straight pipes of the plurality of straight pipes, wherein a cross-sectional shape of each spacer is a polygon having three or more vertices, each spacer has a through-hole at a center in the plane, an inner straight pipe is located to pass through the through-hole, a frictional coefficient ?i between each spacer and the inner straight pipe is 0.1 or less, a frictional coefficient ?o between each spacer and an outer straight pipe is 0.1 or less, and a ratio Ld/d of a diagonal equivalent length Ld of the polygon to an inner diameter d of the outer straight pipe of the adjacent two straight pipes is 0.9 or less.Type: ApplicationFiled: May 29, 2018Publication date: July 9, 2020Applicant: JFE STEEL CORPORATIONInventors: Yasuhide ISHIGURO, Akio SATO, Shigeto SAKASHITA
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Publication number: 20200200316Abstract: Provided is a thermal-insulated multi-walled pipe for superconducting power transmission that highly prevents intrusion of external heat due to radiation and has excellent thermal insulation property without using a superinsulation. A thermal-insulated multi-walled pipe for superconducting power transmission comprises: a superconducting cable; and a multi-walled pipe that houses the superconducting cable, wherein the multi-walled pipe is composed of a plurality of straight pipes, and at least one of the plurality of straight pipes has, at a surface thereof, a zinc or zinc alloy-plated layer having an average spangle size of 2.0 mm or less.Type: ApplicationFiled: May 29, 2018Publication date: June 25, 2020Applicant: JFE STEEL CORPORATIONInventors: Yasuhide ISHIGURO, Akio SATO, Shigeto SAKASHITA
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Publication number: 20200203042Abstract: Provided is a thermal-insulated multi-walled pipe for superconducting power transmission that highly prevents intrusion of external heat due to radiation and has excellent thermal insulation property without using a superinsulation and can be produced easily. A thermal-insulated multi-walled pipe for superconducting power transmission comprises: a superconducting cable; and a multi-walled pipe that houses the superconducting cable, wherein the multi-walled pipe is composed of a plurality of straight pipes, and at least one of the plurality of straight pipes has, at a surface thereof, a coating layer containing a metal powder.Type: ApplicationFiled: May 29, 2018Publication date: June 25, 2020Inventors: Yasuhide ISHIGURO, Akio SATO, Shigeto SAKASHITA
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Patent number: 10436755Abstract: An ultrasonic flaw detection apparatus includes: a seam detection unit that captures a thermal image of a welded seam portion of an electric resistance welded pipe; an ultrasonic flaw detection sensor head that includes an ultrasonic probe that performs ultrasonic flaw detection on the welded seam portion; a seam position calculation unit that calculates a seam position and a bead cutting position of the electric resistance welded pipe; a bead cutting band detection unit that detects a bead cutting band of the electric resistance welded pipe; a bead cutting position calculation unit that calculates a bead cutting position of the electric resistance welded pipe; a tracking movement amount calculation unit that calculates a tracking movement amount of the ultrasonic flaw detection sensor head; and a sensor head driving unit that moves the ultrasonic flaw detection sensor head to track the welded seam portion according to the tracking movement amount.Type: GrantFiled: July 1, 2015Date of Patent: October 8, 2019Assignee: JFE Steel CorporationInventors: Yutaka Matsui, Shigeto Sakashita, Atsushi Yonemoto
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Patent number: 10002418Abstract: A laser beam welding diagnosis apparatus includes: an imaging unit configured to capture images of a laser beam welding penetration side of a laser beam welded portion at a predetermined time interval; a feature amount calculating unit configured to calculate, from an image captured by the imaging unit, a feature amount of a jetted portion accompanying laser beam welding penetration; a welding diagnosis unit configured to determine that a welding defect in the laser beam welded portion has occurred when values of the feature amounts of a predetermined area around the laser beam welded portion on the laser beam welding penetration side become equal to or less than a predetermined value for a predetermined duration or longer; and an output unit configured to output a welding quality state including the occurrence of the welding defect.Type: GrantFiled: August 29, 2014Date of Patent: June 19, 2018Assignee: JFE STEEL CORPORATIONInventors: Toshifumi Kodama, Shigeto Sakashita
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Publication number: 20170205380Abstract: An ultrasonic flaw detection apparatus includes: a seam detection unit that captures a thermal image of a welded seam portion of an electric resistance welded pipe; an ultrasonic flaw detection sensor head that includes an ultrasonic probe that performs ultrasonic flaw detection on the welded seam portion; a seam position calculation unit that calculates a seam position and a bead cutting position of the electric resistance welded pipe; a bead cutting band detection unit that detects a bead cutting band of the electric resistance welded pipe; a bead cutting position calculation unit that calculates a bead cutting position of the electric resistance welded pipe; a tracking movement amount calculation unit that calculates a tracking movement amount of the ultrasonic flaw detection sensor head; and a sensor head driving unit that moves the ultrasonic flaw detection sensor head to track the welded seam portion according to the tracking movement amount.Type: ApplicationFiled: July 1, 2015Publication date: July 20, 2017Inventors: Yutaka Matsui, Shigeto Sakashita, Atsushi Yonemoto
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Publication number: 20160203596Abstract: A laser beam welding diagnosis apparatus includes: an imaging unit configured to capture images of a laser beam welding penetration side of a laser beam welded portion at a predetermined time interval; a feature amount calculating unit configured to calculate, from an image captured by the imaging unit, a feature amount of a jetted portion accompanying laser beam welding penetration; a welding diagnosis unit configured to determine that a welding defect in the laser beam welded portion has occurred when values of the feature amounts of a predetermined area around the laser beam welded portion on the laser beam welding penetration side become equal to or less than a predetermined value for a predetermined duration or longer; and an output unit configured to output a welding quality state including the occurrence of the welding defect.Type: ApplicationFiled: August 29, 2014Publication date: July 14, 2016Applicant: JFE STEEL CORPORATIONInventors: Toshifumi KODAMA, Shigeto SAKASHITA
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Patent number: 9109884Abstract: A method for manufacturing an electric resistance steel pipe having a good toughness at a welded portion is provided, the method being capable of stably manufacturing an electric resistance welded steel pipe having a desirable toughness at a welded portion although a steel strip serving as a base material has a dimensional variation. Groove shapes and are applied to edges and of an open pipe, an edge shape monitor continuously captures images of the edges and immediately before electric resistance welding, and the captured images are input to an arithmetic processing unit for image processing.Type: GrantFiled: February 8, 2008Date of Patent: August 18, 2015Assignee: JFE Steel CorporationInventors: Tomohiro Inoue, Shigeto Sakashita, Daijiro Yuasa, Hiroyasu Yokoyama, Kazuhito Kenmochi, Yukinori Iizuka
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Patent number: 8604382Abstract: There is provided a method for manufacturing a laser welded steel pipe in which the status of laser welding is accurately assessed, and the assessment is used to modify welding conditions, so that laser welded steel pipes can be manufactured at a high yield rate and in a stable manner. Irradiation point(s) of laser beam(s), with which the longitudinal edges are irradiated from the side of the outer surface, are monitored from the side of the inner surface of an open pipe, and then conditions of welding with the laser beam(s) are assessed to be kept unchanged if any keyhole is found penetrating out of the inner surface of the open pipe, or modified if no keyhole is found penetrating out of the inner surface of the open pipe.Type: GrantFiled: June 22, 2009Date of Patent: December 10, 2013Assignee: JFE Steel CorporationInventors: Koji Yano, Kenji Oi, Masahito Suzuki, Toshifumi Kodama, Shigeto Sakashita
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Patent number: 8578580Abstract: According to the present invention, penetrators can be adequately determined as flaws. In particular, a welded zone of a pipe is subjected to ultrasonic flaw detection at least in a pipe axial direction, and the quality of the pipe is evaluated using observed values in units of a predetermined area in a pipe thickness direction and the pipe axial direction. The length of one side of the predetermined area is an ultrasound beam width or more and a pipe thickness or less. The quality of the pipe can be evaluated while shifting the predetermined area in the pipe axial direction by using an average value of the observed values within the predetermined area. The length of one side of the predetermined area can be made an ultrasound beam width or more and a pipe thickness or less.Type: GrantFiled: May 18, 2007Date of Patent: November 12, 2013Assignee: JFE Steel CorporationInventors: Yukinori Iizuka, Kazuhito Kenmochi, Hiroyasu Yokoyama, Tomohiro Inoue, Shigeto Sakashita
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Patent number: 8393217Abstract: The present invention has a structure capable of detecting the scattered-type penetrator having oxides each with the size of several ?m sparsely and widely dispersed. Specifically, the structure includes a wave transmission unit 6 for transmitting an ultrasonic wave to the welded surface of the welded portion 2 in a pipe axial direction of the pipe 1 such that the beam width of a transmission beam 8 is brought into a range from 0.5 mm to 2.5 mm, and a wave reception unit 7 for receiving at least a portion of the reflection wave (reception beam 9) at the welded surface. The wave transmission unit 6 and the wave reception unit 7 include transmission/reception units formed of different groups of transducer elements on at least one or more array probes 5 arranged in the circumferential direction of the pipe.Type: GrantFiled: May 18, 2007Date of Patent: March 12, 2013Assignee: JFE Steel CorporationInventors: Yukinori Iizuka, Kazuhito Kenmochi, Hiroyasu Yokoyama, Tomohiro Inoue, Shigeto Sakashita
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Patent number: 8266964Abstract: An ultrasonic flaw detection is performed to a welded portion 2 of a pipe body 1, a defect detection threshold value is determined based on the signal intensity difference between the total area of the defects existing in the region of an ultrasonic beam on a welded surface and an artificial defect, and a quality control of the pipe body is performed based on the defect detection threshold value. An equivalent defect diameter is determined from the defect density on the welded surface of the welded portion of the pipe body in a pipe axis direction and the area of the ultrasonic beam on the welded surface based on the total area of the defects existing in the region of the ultrasonic beam, and the defect detection threshold value is determined based on the equivalent defect diameter and the signal intensity difference of the artificial defect.Type: GrantFiled: May 18, 2007Date of Patent: September 18, 2012Assignee: JFE Steel CorporationInventors: Yukinori Iizuka, Kazuhito Kenmochi, Hiroyasu Yokoyama, Tomohiro Inoue, Shigeto Sakashita
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Publication number: 20110100965Abstract: There is provided a method for manufacturing a laser welded steel pipe in which the status of laser welding is accurately assessed, and the assessment is used to modify welding conditions, so that laser welded steel pipes can be manufactured at a high yield rate and in a stable manner. Irradiation point(s) of laser beam(s), with which the longitudinal edges are irradiated from the side of the outer surface, are monitored from the side of the inner surface of an open pipe, and then conditions of welding with the laser beam(s) are assessed to be kept unchanged if any keyhole is found penetrating out of the inner surface of the open pipe, or modified if no keyhole is found penetrating out of the inner surface of the open pipe.Type: ApplicationFiled: June 22, 2009Publication date: May 5, 2011Applicant: JFE Steel CorporationInventors: Koji Yano, Kenji Oi, Masahito Suzuki, Toshifumi Kodama, Shigeto Sakashita
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Publication number: 20100107725Abstract: An ultrasonic flaw detection is performed to a welded portion 2 of a pipe body 1, a defect detection threshold value is determined based on the signal intensity difference between the total area of the defects existing in the region of an ultrasonic beam on a welded surface and an artificial defect, and a quality control of the pipe body is performed based on the defect detection threshold value. An equivalent defect diameter is determined from the defect density on the welded surface of the welded portion of the pipe body in a pipe axis direction and the area of the ultrasonic beam on the welded surface based on the total area of the defects existing in the region of the ultrasonic beam, and the defect detection threshold value is determined based on the equivalent defect diameter and the signal intensity difference of the artificial defect.Type: ApplicationFiled: May 18, 2007Publication date: May 6, 2010Applicant: JFE Steel CorporationInventors: Yukinori Iizuka, Kazuhito Kenmochi, Hiroyasu Yokoyama, Tomohiro Inoue, Shigeto Sakashita
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Publication number: 20100101326Abstract: The present invention has a structure capable of detecting the scattered-type penetrator having oxides each with the size of several ?m sparsely and widely dispersed. Specifically, the structure includes a wave transmission unit 6 for transmitting an ultrasonic wave to the welded surface of the welded portion 2 in a pipe axial direction of the pipe 1 such that the beam width of a transmission beam 8 is brought into a range from 0.5 mm to 2.5 mm, and a wave reception unit 7 for receiving at least a portion of the reflection wave (reception beam 9) at the welded surface. The wave transmission unit 6 and the wave reception unit 7 include transmission/reception units formed of different groups of transducer elements on at least one or more array probes 5 arranged in the circumferential direction of the pipe.Type: ApplicationFiled: May 18, 2007Publication date: April 29, 2010Applicant: JFE Steel CorporationInventors: Yukinori Iizuka, Kazuhito Kenmochi, Hiroyasu Yokoyama, Tomohiro Inoue, Shigeto Sakashita
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Publication number: 20100064495Abstract: According to the present invention, penetrators can be adequately determined as flaws. In particular, a welded zone of a pipe is subjected to ultrasonic flaw detection at least in a pipe axial direction, and the quality of the pipe is evaluated using observed values in units of a predetermined area in a pipe thickness direction and the pipe axial direction. The length of one side of the predetermined area is an ultrasound beam width or more and a pipe thickness or less. The quality of the pipe can be evaluated while shifting the predetermined area in the pipe axial direction by using an average value of the observed values within the predetermined area. The length of one side of the predetermined area can be made an ultrasound beam width or more and a pipe thickness or less.Type: ApplicationFiled: May 18, 2007Publication date: March 18, 2010Applicant: JFE STEEL CORPORATIONInventors: Yukinori Iizuka, Kazuhito Kenmochi, Hiroyasu Yokoyama, Tomohiro Inoue, Shigeto Sakashita
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Publication number: 20100059484Abstract: A method for manufacturing an electric resistance steel pipe having a good toughness at a welded portion is provided, the method being capable of stably manufacturing an electric resistance welded steel pipe having a desirable toughness at a welded portion although a steel strip serving as a base material has a dimensional variation. Groove shapes and are applied to edges and of an open pipe, an edge shape monitor continuously captures images of the edges and immediately before electric resistance welding, and the captured images are input to an arithmetic processing unit for image processing.Type: ApplicationFiled: February 8, 2008Publication date: March 11, 2010Applicant: JFE STEEL CORPORATIONInventors: Tomohiro Inoue, Shigeto Sakashita, Daijiro Yuasa, Hiroyasu Yokoyama, Kazuhito Kenmochi, Yukinori Iizuka