Patents Assigned to Neturen Co., Ltd.
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Publication number: 20130305652Abstract: A rebar structure includes a plurality of column longitudinal bars to be connected to a beam. The yield point or the 0.2% proof stress of at least a portion the column longitudinal bars is larger than the yield point or the 0.2% proof stress of a normal reinforcing bar defined by JIS G 3112.Type: ApplicationFiled: May 17, 2013Publication date: November 21, 2013Applicant: NETUREN CO., LTD.Inventors: Fukuma IIHOSHI, Yoshiyuki MURATA, Yoshifumi NAKAMURA
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Publication number: 20130300405Abstract: A quenching depth measuring method is used for measuring the quenching depth in a workpiece and includes the steps of: magnetizing the workpiece by disposing, in the vicinity of the workpiece, a magnetizer equipped with an exciting coil; detecting, through a detection coil, an induced magnetic field generated by the magnetization; measuring the induced magnetic field as the output voltage of the detection coil; and specifying the thickness of the quenched hardened layer of the workpiece on the basis of known electromagnetic characteristic information of an unquenched material and a fully-quenched material and an output voltage value measured by the detection coil, the unquenched material being made of the same material as the constituent material of the workpiece and being a material on which a quenching process is not performed, the fully-quenched material being a material on which the quenching process is performed.Type: ApplicationFiled: October 26, 2011Publication date: November 14, 2013Applicant: NETUREN CO., LTD.Inventors: Yuji Gotoh, Noriyoshi Takaoka, Kazuhiro Kawasaki, Yoshitaka Misaka
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Patent number: 8545642Abstract: Providing an iron and steel material having quenched surface part, avoiding oxidation of a compound layer formed on the surface of the iron and steel material due to quenching, its production method, and an induction-quenched component. A quenched iron and steel material 10 comprises an iron and steel material 11, a compound layer 12 formed on the iron and steel material 11, and an antioxidant cover layer 13 formed on the compound layer 12. The iron and steel material 11 has a hardened layer having a given depth, and the surface of the iron and steel material 11 has enhanced hardness.Type: GrantFiled: May 19, 2009Date of Patent: October 1, 2013Assignees: Neturen Co., Ltd., Nihon Parkerizing Co., Ltd.Inventors: Kengo Fukazawa, Yoshitaka Misaka, Kazuhiro Kawasaki, Yoshihiro Ikeda, Masaaki Beppu, Arata Suda
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Publication number: 20130252014Abstract: The core metal for resin welding improves bonding strength between an outer peripheral resin member and the core metal. The outer peripheral resin member 30 is welded to the peripheral surface 21 of the core metal 20 by fitting the core metal into a fitting hole 31 of the outer peripheral resin member 30, preparing the outer peripheral resin member 30 providing the fitting hole 31 with a smooth internal wall surface; preparing the core metal 20 wherein streaky protrusions 26 and smooth portions 25 are provided; allowing the top parts of the protrusions 26 to contact, and the smooth portions of the core metal 20 to face the smooth internal wall surface; and induction heating to weld the outer peripheral resin member 30 to the protrusions 26 and the smooth portions 25.Type: ApplicationFiled: March 23, 2012Publication date: September 26, 2013Applicant: NETUREN CO., LTD.Inventors: Hideto Sayama, Toshio Hachiya, Kanji Endo, Masatoshi Akiyama
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Patent number: 8522594Abstract: A workpiece enlarging method is provided, by which an enlarged portion can stably be formed on a portion of a workpiece such as a shaft member, and a drive force required to form the enlarged portion can be reduced. The workpiece enlarging method forms the enlarged portion on the workpiece (W) by applying, with respect to the workpiece (W), alternating shear energy in a transverse direction thereof so as to suppress deformation of the workpiece (W) within an elastic limit while applying compression energy that produces compressive stress equal to or greater than an initial yield strength to increase internal energy of the workpiece (W), thereby decomposing a portion of the increased internal energy by the alternating shear energy and deforming and enlarging the enlargement intended area of the workpiece (W) with the assistance of the decomposed energy obtained by the decomposition.Type: GrantFiled: July 21, 2009Date of Patent: September 3, 2013Assignee: Neturen Co., Ltd.Inventors: Nagatoshi Okabe, Eiji Yamashita
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Patent number: 8499660Abstract: The one end side portion is nipped by a jig including a jig member having a pair of convex portions which are to be fitted to a depressions in contact with a tooth side face and a inclined portion and positioning a bar and a jig member which is to be clamped/opened with respect to the jig member. A die having an inside diameter smaller than the diameter of the outer periphery is pressed onto the outer periphery of the end portion of the cylindrical end side portion projected from the jig up to a press-in depth determined preliminarily based on the rack, so as to reduce the diameter of the end portion.Type: GrantFiled: January 10, 2012Date of Patent: August 6, 2013Assignee: Neturen Co., Ltd.Inventors: Takashi Yamawaki, Ryosuke Suzuki, Tetsuji Murata, Tsuyoshi Yamamoto, Yutaka Kiyosawa
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Patent number: 8497454Abstract: An induction hardening monitoring apparatus (20) comprising: a current sensor (21) for detecting output current from a high-frequency inverter (11); a voltage sensor for detecting a voltage generated in a heating coil (14) connected between output terminals of the high-frequency inverters (11) together with a capacitor (12) in an equivalent circuit manner; and a controller (23) for monitoring a hardening processing based on a detection signal from the current sensor (21) and a detection signal from a voltage sensor (22), wherein the controller (23) monitors a hardening processing by calculating an effective value of output current from the high-frequency inverter (11) based on a detection signal from the current sensor (21) and calculating an effective value of voltage generated in a heating coil (14) based on a detection signal from the voltage sensor (22); or further calculating load impedance based on each effective value.Type: GrantFiled: September 10, 2008Date of Patent: July 30, 2013Assignee: Neturen Co., Ltd.Inventors: Yue Yang, Fumiaki Ikuta, Taichi Kitamura
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Publication number: 20130140299Abstract: A heating coil includes a pair of linear lead portions adapted to be connected to a power supply, and a ring-shaped or coil-shaped head portion having end portions connected to the lead portions respectively. A flow path through which a cooling medium flows is formed inside the lead portions and the head portion. An outer circumferential surface of the head portion has a circular or elliptical cross section and is configured to face a heating target portion of an inner circumferential surface of a work extending, the heating target portion extending in a circumferential direction of the work. Each of the lead portions has a straight side portion in a plane intersecting a longitudinal direction of the lead portions, the straight side portions of the lead portions being arranged in proximity to each other.Type: ApplicationFiled: December 5, 2012Publication date: June 6, 2013Applicant: NETUREN CO., LTD.Inventor: NETUREN CO., LTD.
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Publication number: 20130125689Abstract: The present invention includes a bar having a maximum cross section region smaller than a minimum cross section region of a hollow portion of a pipe P, and projected portions mounted along an axial direction of the bar and including a projected portion with maximum extent Hb, extent Ha of the projected portion positioned at a leading end side of the bar is set to be smaller than extent Hb of the projected portion positioned at a center side in the axial direction, and extent Hc of the projected portion positioned at a base end side of the bar is set to be less than or equal to extent Hb of the projected portion.Type: ApplicationFiled: January 2, 2013Publication date: May 23, 2013Applicant: NETUREN CO., LTD.Inventor: NETUREN CO., LTD.
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Publication number: 20120234824Abstract: A heating apparatus, a heat treatment apparatus, and a heating method are provided. The heating apparatus includes a workpiece support on which a ring-shaped workpiece is placed, a rotary drive assembly, and a heater configured to heat the workpiece. The workpiece support includes a plurality of rotating rollers arranged in a circumferential direction. The rotary drive assembly is configured to rotate the plurality of rotating rollers to rotate the workpiece placed on the workpiece support along a ring shape of the workpiece. The heater includes a heating coil configured to induction-heat the workpiece on the workpiece support at a heating position, and an actuator configured to move the heating coil at the heating position relative to the workpiece to adjust a distance between the workpiece and the heating coil.Type: ApplicationFiled: March 14, 2012Publication date: September 20, 2012Applicants: NETUREN TAKUTO CO., LTD, NETUREN CO., LTDInventors: Hitoshi Nakatsu, Hisaaki Watanabe
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Publication number: 20120125919Abstract: According to an embodiment, an induction heating coil includes a heating conductor portion which is formed of a conductor member and has a zigzag shape in which a bent portion opened to one side in a first direction and a bent portion opened to the other side in the first direction are alternately continuously arranged in opposite directions along a second direction crossing the first direction.Type: ApplicationFiled: January 27, 2012Publication date: May 24, 2012Applicant: NETUREN CO., LTD.Inventors: Yoshimasa Tanaka, Yoshitaka Misaka, Yuji Asano
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Publication number: 20120129006Abstract: A welding structural part 1 is manufactured by overlapping the surfaces of steel sheets 2, and forming a weld zone by spot welding. The weld zone 3 includes: a weld nugget 4; and a heat affected zone 5 surrounding the weld nugget 4, wherein the hardness in the weld zone increases along an exterior region 6 of the heat affected zone 5 toward the heat affected zone 5, and then decreases along the heat affected zone 5 toward the central region of the weld nugget 4. In the boundary region between the weld nugget 4 and the heat affected zone 5, the weld nugget 4 may have a convex portion 4A bulging into the heat affected zone 5 along the overlapped portion. The steel sheets 2 contain carbon in 0.15 mass % or more.Type: ApplicationFiled: July 30, 2010Publication date: May 24, 2012Applicants: NETUREN CO., LTD., NATIONAL INSTITUTE FOR MATERIALS SCIENCE, NISSAN MOTOR CO., LTD.Inventors: Takahiko Kanai, Munehisa Hatta, Fumiaki Ikuta, Kazuhiro Kawasaki, Eizaburou Nakanishi, Masayuki Miyake, Kotobu Nagai, Masao Hayakawa, Takehiko Itagaki
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Publication number: 20120118440Abstract: A high-strength die-quenched part 1 is formed by heating a high-strength steel sheet 11 up to an austenite region, hot stamping and cooling inside a mold, and its microstructure has the martensite wherein carbide particles 2 are finely dispersed over an entire region including prior-austenite grain boundaries. It is desirable that the prior-austenite grain size in the microstructure of the high-strength steel sheet, which is a base material, be 10 ?m or smaller. The high-strength die-quenched part has high-strength and high-ductility thanks to its martensite.Type: ApplicationFiled: May 26, 2010Publication date: May 17, 2012Applicants: NISSAN MOTOR CO., LTD., NETUREN CO., LTD., NATIONAL INSTITUTE FOR MATERIALS SCIENCEInventors: Eizaburou Nakanishi, Masayuki Miyake, Kotobu Nagai, Masao Hayakawa, Takehito Itagaki, Takahiko Kanai, Munehisa Hatta, Kazuhiro Kawasaki
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Publication number: 20120103120Abstract: The one end side portion is nipped by a jig including a jig member having a pair of convex portions which are to be fitted to a depressions in contact with a tooth side face and a inclined portion and positioning a bar and a jig member which is to be clamped/opened with respect to the jig member. A die having an inside diameter smaller than the diameter of the outer periphery is pressed onto the outer periphery of the end portion of the cylindrical end side portion projected from the jig up to a press-in depth determined preliminarily based on the rack, so as to reduce the diameter of the end portion.Type: ApplicationFiled: January 10, 2012Publication date: May 3, 2012Applicant: NETUREN CO., LTD.Inventors: Takashi Yamawaki, Ryosuke Suzuki, Tetsuji Murata, Tsuyoshi Yamamoto, Yutaka Kiyosawa
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Publication number: 20120102739Abstract: The one end side portion is nipped by a jig including a jig member having a pair of convex portions which are to be fitted to a depressions in contact with a tooth side face and a inclined portion and positioning a bar and a jig member which is to be clamped/opened with respect to the jig member. A die having an inside diameter smaller than the diameter of the outer periphery is pressed onto the outer periphery of the end portion of the cylindrical end side portion projected from the jig up to a press-in depth determined preliminarily based on the rack, so as to reduce the diameter of the end portion.Type: ApplicationFiled: January 10, 2012Publication date: May 3, 2012Applicant: NETUREN CO., LTD.Inventors: Takashi Yamawaki, Ryosuke Suzuki, Tetsuji Murata, Tsuyoshi Yamamoto, Yutaka Kiyosawa
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Publication number: 20120097663Abstract: The present invention includes: a hardening control unit (70) for controlling an induction hardening apparatus (10, 10A) based on setup conditions data regarding the induction hardening apparatus (10, 10A); a hardening monitoring unit (20) that measures, as measurement data, the electric quantity in an electric circuit configured to include a high-frequency inverter (11), a capacitor (12), and a heating coil (14, 14A, 14B) and that monitors an induction hardening status; and a data collecting unit (80) that collects the data from various sensors in the induction hardening apparatus (10, 10A, 10B) obtained when the induction hardening apparatus (10) subjects the work (15, 15A, 15B) to an induction hardening based on the setup conditions data outputted from the hardening control unit (70) and that collects the measurement data from the hardening monitoring unit (20) to store the collected data from the various sensors and the measurement data so that the collected data from the various sensors and the measuremeType: ApplicationFiled: March 12, 2009Publication date: April 26, 2012Applicant: NETUREN CO., LTD.Inventors: Keisuke Ito, Yue Yang, Fumiaki Ikuta, Taichi Kitamura, Tetsuya Ono, Ken-ichi Hoshiba
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Patent number: 8104369Abstract: The one end side portion is nipped by a jig including a jig member having a pair of convex portions which are to be fitted to a depressions in contact with a tooth side face and a inclined portion and positioning a bar and a jig member which is to be clamped/opened with respect to the jig member. A die having an inside diameter smaller than the diameter of the outer periphery is pressed onto the outer periphery of the end portion of the cylindrical end side portion projected from the jig up to a press-in depth determined preliminarily based on the rack, so as to reduce the diameter of the end portion.Type: GrantFiled: March 20, 2008Date of Patent: January 31, 2012Assignee: Neturen Co., Ltd.Inventors: Takashi Yamawaki, Ryosuke Suzuki, Tetsuji Murata, Tsuyoshi Yamamoto, Yutaka Kiyosawa
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Publication number: 20110303655Abstract: A welding equipment for metallic materials capable of performing heat treatment such as tempering based on partial heating in spot welding is provided. The welding equipment 1 sandwiches metallic materials 9 with a pair of electrodes 4, 4, and heats different regions of the metallic materials 9 by energization, with the pair of electrodes 4, 4 maintained at the same position with respect to the metallic materials 9. The welding equipment includes a first heating means 6 connected to the pair of electrodes 4, 4 for heating and welding the internal region of the circle defined by projecting the cross-sectional area of the axis of the electrodes on the metallic materials by applying power having a low first frequency, a second heating means 8 for heating a ring-shaped region along the circle by applying power having a second frequency that is higher than the first frequency, and an energization control unit 10 for independently controlling the first and the second heating means 6, 8.Type: ApplicationFiled: September 30, 2009Publication date: December 15, 2011Applicants: NATIONAL INSTITUTE FOR MATERIALS SCIENCE, NETUREN CO., LTD.Inventors: Takahiko Kanai, Munehisa Hatta, Fumiaki Ikuta, Kazuhiro Kawasaki, Eizaburo Nakanishi, Tsuyoshi Yoshida, Kotobu Nagai, Masao Hayakawa, Takehiko Itagaki
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Publication number: 20110132060Abstract: A workpiece enlarging method is provided, by which an enlarged portion can stably be formed on a portion of a workpiece such as a shaft member, and a drive force required to form the enlarged portion can be reduced. The workpiece enlarging method forms the enlarged portion on the workpiece (W) by applying, with respect to the workpiece (W), alternating shear energy in a transverse direction thereof so as to suppress deformation of the workpiece (W) within an elastic limit while applying compression energy that produces compressive stress equal to or greater than an initial yield strength to increase internal energy of the workpiece (W), thereby decomposing a portion of the increased internal energy by the alternating shear energy and deforming and enlarging the enlargement intended area of the workpiece (W) with the assistance of the decomposed energy obtained by the decomposition.Type: ApplicationFiled: July 21, 2009Publication date: June 9, 2011Applicant: NETUREN CO., LTD.Inventors: Nagatoshi Okabe, Eiji Yamashita
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Publication number: 20110017368Abstract: According to one aspect of the present invention, there is provided a process of fabricating a steel material by performing a heat treatment to a steel material having high strength, in order to reduce hardness at one part of the steel material to less than hardness at other parts of the steel material, wherein the heat treatment comprises a heating step in which a portion having a certain depth from a surface of the steel material is rapidly heated by induction heating or direct energization heating, and a cooling step in which the steel material, which has been subject to the heating step, is rapidly cooled a predetermined time after the heating step, and a heating temperature in the heating step is Ac1 transforming point or more.Type: ApplicationFiled: September 30, 2010Publication date: January 27, 2011Applicants: NETUREN CO., LTD., NIPPON STEEL CORPORATIONInventors: Tsukasa Okamura, Kengo Iwanaga, Osamu Watanabe, Jun-ichi Kodama, Daisuke Hirakami, Mikiyuki Ichiba, Yoshiharu Ueki