Patents Assigned to Neturen Co., Ltd.
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Patent number: 10443108Abstract: 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: GrantFiled: January 21, 2016Date of Patent: October 15, 2019Assignees: NETUREN CO., LTD., NETUREN TAKUTO CO., LTD.Inventors: Hitoshi Nakatsu, Hisaaki Watanabe
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Patent number: 10415109Abstract: A workpiece for an induction hardening is provided. The workpiece has a first inclined surface, a second inclined surface, and a connecting surface connecting the first inclined surface and the second inclined surface on a side toward which the first inclined surface and the second inclined surface approach each other. The connecting surface has a recessed portion. A hardened layer formed at the first inclined surface and another hardened layer formed at the second inclined surface do not overlap each other at the recessed portion.Type: GrantFiled: March 31, 2015Date of Patent: September 17, 2019Assignee: NETUREN CO., LTD.Inventor: Yutaka Kiyosawa
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Patent number: 10415114Abstract: A wire heating system includes an induction heating apparatus having a power supply and an induction coil arranged to heat a wire rod by an induction heating using current supplied from the power supply, and a controller configured to control the current to be supplied to the induction coil based on a feeding speed of the wire rod. The induction heating apparatus has a heating section in which the wire rod is heated by the induction heating using the induction coil, and a soaking section located downstream of the heating section to homogenize the temperature distribution of the induction-heated wire rod. The controller is configured to control the current to be supplied to the induction coil such that a temperature of the wire rod at a downstream end of the soaking section becomes a target temperature.Type: GrantFiled: March 14, 2014Date of Patent: September 17, 2019Assignee: NETUREN CO., LTD.Inventors: Takashi Horino, Fumiaki Ikuta
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Publication number: 20190218635Abstract: Object of the present invention is to provide a welding method prevented the fracture at the spot welding zone by recovering the strength of a spot welding zone, namely, the ductility and the toughness in the spot welding zone, and a weld structure manufactured by the method. In the welding method, a spot welding zone provided with a weld nugget is formed by conducting spot welding on the heat treated steel sheets in a stack; the spot welding zone is tempering treated by the high-frequency electrical current application to make the weld nugget have a hardness of 150% or less of the hardness of the heat treated steel sheets, and the heat affected zone surrounding the weld nugget is made to have a hardness of 30% to 90% of the hardness at the weld nugget before the tempering treatment by the high-frequency electrical current application.Type: ApplicationFiled: March 22, 2019Publication date: July 18, 2019Applicant: NETUREN CO., LTD.Inventors: Akira TERAJIMA, Kazuhiro KAWASAKI, Fumiaki IKUTA, Yasuyuki KOYATA, Yoshitaka MISAKA
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Patent number: 10356854Abstract: A power conversion apparatus and a power conversion method are provided. The power conversion apparatus includes a rectifier configured to convert AC power to DC power, a smoothing filter configured to control the DC power received from the rectifier to be constant, an inverter configured to convert the DC power received from the smoothing filter into high-frequency power by turning the DC power on and off using a switching device, and a control unit configured to control the rectifier and the inverter. A rating of output power from the inverter is determined in accordance with a frequency of the high-frequency power output from the inverter, a current-applying time, and an operation rate obtained by dividing the current-applying time by a sum of the current-applying time and a non-current-applying time.Type: GrantFiled: December 19, 2014Date of Patent: July 16, 2019Assignee: NETUREN CO., LTD.Inventors: Takahiko Kanai, Tetsuya Ono, Junya Ito
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Publication number: 20190206810Abstract: A power semiconductor module, a snubber circuit for the power semiconductor module, and induction heating power supply apparatus having the power semiconductor module are provided. The power semiconductor module includes a power semiconductor device configured to perform a switching operation, a casing inside which the power semiconductor device is provided, a control circuit board provided on top of an upper surface of the casing, a control terminal for the power semiconductor device being provided on the upper surface of the casing and connected to the control circuit board, and a shield plate disposed between the control circuit board and the upper surface of the casing to cover the upper surface of the casing and to cover at least one side surface of the casing.Type: ApplicationFiled: August 16, 2017Publication date: July 4, 2019Applicant: NETUREN CO., LTD.Inventors: Takahiko KANAI, Masato SUGIMOTO, Haruki YOSHIDA
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Patent number: 10314118Abstract: To heat a workpiece having a recess portion provided along a longitudinal axis of the workpiece, the workpiece is inserted into an induction heating coil, and the induction heating coil or the workpiece is along an axial direction of the workpiece. The induction heating coil has a conductor configured to surround the workpiece around the axis of the workpiece. The conductor has a protruding portion protruding inwardly to face the recess portion of the workpiece.Type: GrantFiled: December 17, 2014Date of Patent: June 4, 2019Assignee: NETUREN CO., LTD.Inventors: Hirokazu Inaba, Yutaka Kiyosawa
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Patent number: 10301692Abstract: Object of the present invention is to provide a welding method prevented the fracture at the spot welding zone by recovering the strength of a spot welding zone, namely, the ductility and the toughness in the spot welding zone, and a weld structure manufactured by the method. In the welding method, a spot welding zone provided with a weld nugget 13a is formed by conducting spot welding on the heat treated steel sheets in a stack; the spot welding zone is tempering treated by the high-frequency electrical current application to make the weld nugget have a hardness of 150% or less of the hardness of the heat treated steel sheets, and the heat affected zone surrounding the weld nugget is made to have a hardness of 30% to 90% of the hardness at the weld nugget before the tempering treatment by the high-frequency electrical current application.Type: GrantFiled: September 9, 2015Date of Patent: May 28, 2019Assignee: NETUREN CO., LTD.Inventors: Akira Terajima, Kazuhiro Kawasaki, Fumiaki Ikuta, Yasuyuki Koyata, Yoshitaka Misaka
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Patent number: 10285221Abstract: An induction heating coil (3) has a primary coil (4) to which electric power is supplied and a ring-shaped secondary coil (5) forming a closed circuit. The primary coil (4) has a base-side portion that covers an outer periphery of the secondary coil (5) and a distal-side portion extending from the base-side portion in the center axis direction of the secondary coil (5) in a state in which the base-side portion covers the secondary coil (5). The opening width of the base-side portion is greater than the opening width of the distal-side portion. The secondary coil (5) is provided such that it can be inserted into and removed from the inside of the primary coil (4) from the base-side portion of the primary coil (4).Type: GrantFiled: September 17, 2014Date of Patent: May 7, 2019Assignee: NETUREN CO., LTD.Inventors: Hidehiro Yasutake, Fumiaki Ikuta, Kengo Fukazawa
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Patent number: 10271384Abstract: A direct resistance heating method includes placing a first electrode and a second electrode on a plate-shaped workpiece such that the first electrode and the second electrode extend across the workpiece in a direction substantially perpendicular to a center line of a heating target region of the workpiece, the center line connecting a middle portion of one side of the heating target region and a middle portion of the other side of the heating target region; and moving at least one of the first electrode and the second electrode along the center line while applying electric current between the first electrode and the second electrode.Type: GrantFiled: July 5, 2013Date of Patent: April 23, 2019Assignee: NETUREN CO., LTD.Inventors: Hironori Ooyama, Kunihiro Kobayashi
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Patent number: 10259028Abstract: In a direct resistance heating method, a current is applied to a plate workpiece having a varying cross-sectional area to heat the workpiece such that a high-temperature heating region and a non-high-temperature heating region are provided side by side. The method includes a preparation step of arranging a pair of electrodes on the workpiece, and a heating step of moving a first electrode from one end of the high-temperature heating region while applying a current to the pair of electrodes, stopping the movement of the first electrode when the first electrode reaches the other end of the high-temperature heating region, and stopping the current from being applied to the pair of electrodes when a predetermined time elapses after stopping the first electrode. A press-molded product manufacturing method includes pressing the workpiece that has been heated by direct resistance heating method using a press die to perform hot press molding.Type: GrantFiled: July 28, 2015Date of Patent: April 16, 2019Assignee: NETUREN CO., LTD.Inventors: Hironori Ooyama, Fumiaki Ikuta
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Publication number: 20190099829Abstract: A method for spot-welding metallic materials includes: sandwiching the metallic materials with a pair of electrodes; a pre-heating step for pre-heating a region different from a given region which should be welded by applying electric power having a high frequency to the pair of electrodes; and a welding step for spot-welding a given region of the metallic materials by applying electric power for welding to the pair of electrodes. The heating time in the pre-heating step and that in the welding step are independently controlled.Type: ApplicationFiled: November 30, 2018Publication date: April 4, 2019Applicants: NETUREN CO., LTD., NATIONAL INSTITUTE FOR MATERIALS SCIENCEInventors: Takahiko KANAI, Munehisa HATTA, Fumiaki IKUTA, Kazuhiro KAWASAKI, Eizaburo NAKANISHI, Tsuyoshi YOSHIDA, Kotobu NAGAI, Masao HAYAKAWA, Takehiko ITAGAKI
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Patent number: 10224807Abstract: A power conversion apparatus and a power conversion method are provided for heat treatment. The power conversion apparatus includes a rectifier configured to convert AC power to DC power, a smoothing filter configured to control the DC power received from the rectifier to be constant, an inverter configured to convert the DC power received from the smoothing filer into high-frequency power by turning the DC power on and off using a switching device made of an SiC semiconductor, and a control unit configured to control the rectifier and the inverter. A rating of output power output from the inverter is determined in accordance with a frequency of the high-frequency power output from the inverter, a current-applying time, and an operation rate obtained by dividing the current-applying time by a sum of the current-applying time and a non-current-applying time.Type: GrantFiled: May 17, 2016Date of Patent: March 5, 2019Assignee: NETUREN CO., LTD.Inventors: Takahiko Kanai, Masato Sugimoto, Haruki Yoshida
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Patent number: 10189112Abstract: 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 sandwiches metallic materials with a pair of electrodes, and heats different regions of the metallic materials by energization, with the pair of electrodes maintained at the same position with respect to the metallic materials. The welding equipment includes a first heating means connected to the pair of electrodes 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 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 for independently controlling the first and the second heating means.Type: GrantFiled: June 12, 2015Date of Patent: January 29, 2019Assignees: NETUREN CO., LTD., NATIONAL INSTITUTE FOR MATERIALS SCIENCEInventors: Takahiko Kanai, Munehisa Hatta, Fumiaki Ikuta, Kazuhiro Kawasaki, Eizaburo Nakanishi, Tsuyoshi Yoshida, Kotobu Nagai, Masao Hayakawa, Takehiko Itagaki
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Publication number: 20190008001Abstract: An induction heating power supply apparatus includes a smoothing section to smooth pulsating current of DC power output from a DC power supply section, and an inverter to convert the DC power smoothed by the smoothing section to AC power. The smoothing section includes a pair of bus bars connected to the inverter and a capacitor connected to the pair of bus bars. Each of the bus bars has an external surface extending in a current flow direction, the external surface including a flat face having a larger surface dimension than another face of the external surface in a direction perpendicular to the current flow direction. The bus bars are arranged in a layered manner such that the flat faces of the bus bars are opposed to each other and such that an insulator is sandwiched between the flat faces of the bus bars.Type: ApplicationFiled: September 8, 2016Publication date: January 3, 2019Applicant: NETUREN CO., LTD.Inventors: Takahiko KANAI, Masato SUGIMOTO, Haruki YOSHIDA
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Publication number: 20190008002Abstract: An induction heating, power supply apparatus includes a smoothing section to smooth DC power and an inverter section to convert the smoothed DC power into AC power, The inverter section has first and second modules, each having serially connected switching devices. Output bus bars are interposed between the first and second modules. The smoothing section has first bus bars connected to a DC power supply section and the first module, a capacitor connected to the first bus bars, second bus bars connected to the DC power supply section and the second module, and another capacitor connected to the second bus bars. The first and second bus bars extend parallel to the output bus bars. The first module is interposed between the first bus bars and the output bus bars. The second module is interposed between the second bus bars and the output bus bars.Type: ApplicationFiled: December 22, 2016Publication date: January 3, 2019Applicant: NETUREN CO., LTD.Inventors: Takahiko KANAI, Masato SUGIMOTO, Haruki YOSHIDA
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Patent number: 10159117Abstract: An induction heating system includes induction heating apparatuses, each including a high-frequency current transformer, a low-frequency current transformer and a heating coil, a high-frequency input switch connected to the high-frequency current transformer, a low-frequency input switch connected to the low-frequency current transformer, a first power source to output a high-frequency electric power and a low frequency electric power, a second power source, a first power source output switch connectable to the first power source, a second power source output switch connectable to the second power source, and a switch controller. Each induction heating apparatus includes a heater controller to send a signal to the switching controller to turn on one of the first power source output switch and the second power source output switch, to turn off the other, and to switch on or off each of the high-frequency input switch and the low-frequency input switch.Type: GrantFiled: May 17, 2013Date of Patent: December 18, 2018Assignee: NETUREN CO., LTD.Inventors: Tetsuya Ono, Masato Sugimoto, Yutaka Kiyosawa, Toshihiro Aiba, Kazutomi Oka, Fumiaki Ikuta, Kazuhiro Kawasaki
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Patent number: 10154547Abstract: 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: GrantFiled: December 23, 2015Date of Patent: December 11, 2018Assignee: NETUREN CO., LTD.Inventors: Hideto Sayama, Toshio Hachiya, Kanji Endo, Masatoshi Akiyama
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Patent number: 10138531Abstract: An induction apparatus including a hardening control unit for controlling an induction hardening apparatus based on setup conditions data; a hardening monitoring unit that measures, as measurement data, the electric quantity in an electric circuit and that monitors an induction hardening status; and a data collecting unit that collects the data from various sensors in the induction hardening apparatus obtained when the induction hardening apparatus subjects the work to an induction hardening based on the setup conditions data outputted from the hardening control unit and that collects the measurement data from the hardening monitoring unit to store the collected data from the various sensors and the measurement data so that the collected data are associated to each other.Type: GrantFiled: September 19, 2014Date of Patent: November 27, 2018Assignee: NETUREN CO., LTD.Inventors: Keisuke Ito, Yue Yang, Fumiaki Ikuta, Taichi Kitamura, Tetsuya Ono, Ken-ichi Hoshiba
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Publication number: 20180332672Abstract: An induction heating device and an induction heating method are provided. The entire areas to be heated of the workpiece can be uniformly heated to a predetermined high temperature, and uniform heating is possible even when the workpiece deforms in a non-uniform manner during heating. When areas to be heated are established on a workpiece so as to extend in one direction and the areas to be heated are induction-heated, the deformation amount on one edge of the areas to be heated is different from that on the other. This induction heating device includes; heating coils facing a portion of the areas to be heated when the workpiece is induction-heated; and a relative transfer means for transferring the workpiece and the heating coils along one direction in a relative manner, and the heating coils are disposed so as to correspond to the areas to be heated during the heating period.Type: ApplicationFiled: July 17, 2018Publication date: November 15, 2018Applicant: NETUREN CO., LTD.Inventors: Hitoshi Nakatsu, Masato Yoshioka, Yoshimasa Tanaka, Tsutomu Ito, Kenji Koyanagi, Masaki Sagae, Tatsuya Ishii, Yoshitaka Misaka, Yasuharu Ogawa