Nippon Steel Sumitomo Metal Corporation

Nippon Steel Corporation

Fuji Electric Co., Ltd.

Kenji Umetsu

Yasuhiro Mayumi

Toshiya Takechi

Tsutomu Ueki

Kazuhiko Fukutani

Takehiko Toh

Takatsugu Ueyama

Yoshiaki Nakamura

Kazuto Yamamoto

Hideaki Yamamura

Takanori Isobe

Ryuichi Shimada

Norimasa Yamasaki

Keisuke Fujisaki

Kenzo Sawada

Kensuke Okazawa

Takashi Miyakawa

Keiji Iwata

Junji Nakashima

Kiyoshi Wajima

Tadayuki Kitahara

Keiji Tsunenari

Hosei Hirano

Yasuyuki Ikeda

Yasushi Okumura

Yasuo Matsunaga

Hiroaki Mochinaga

Kazunari Ishizaki

Shigenobu Koga

Takaharu Kataoka

Yasuo Maruki

Coils () are respectively arranged on a front side and a rear side of a planned conveyance plane (CP). Main cores (), edge cores (), and bridge cores (a,b,a,b) are arranged with respect to the coils (). The bridge cores (a,b,a,b) are arranged on a back side of the main cores () and the edge cores (). The main cores () and the edge cores () can be magnetically coupled by using the bridge cores (a,b,a,b).

Transverse flux induction heating device

A first coiland a second coilare faced each other across a conductor plate S so that the first coil () and the second coil () become substantially the same in position in a Y-axis direction. The conductor plate S is inductively heated by applying alternating currents at a frequency at which a depth of penetration of the current becomes equal to or less than half a plate thickness of the conductor plate S to the first coil () and the second coil () in opposite directions.

Induction heating device and induction heating method

The transverse flux induction heating device is allows an alternating magnetic field to intersect the sheet face of a conductive sheet which is conveyed in one direction, thereby inductively heating the conductive sheet. The transverse flux induction heating device includes a heating coil disposed such that a coil face faces the sheet face of the conductive sheet; a core around which the heating coil is coiled; a shielding plate formed of a conductor and disposed between the core and a side end portion in the direction perpendicular to a conveyance direction of the conductive sheet; and a non-conductivesoft magnetic material which is attached to the shielding plate, wherein the shielding plate is interposed between the core and the non-conductive soft magnetic material.

The transverse flux induction heating device is allows an alternating magnetic field to intersect the sheet face of a conductive sheet which is conveyed in one direction, thereby inductively heating the conductive sheet. The transverse flux induction heating device includes a heating coil disposed such that a coil face faces the sheet face of the conductive sheet; a core around which the heating coil is coiled; a shielding plate formed of a conductor and disposed between the core and a side end portion in the direction perpendicular to a conveyance direction of the conductive sheet; and a non-conductive soft magnetic material which is attached to the shielding plate, wherein the shielding plate is interposed between the core and the non-conductive soft magnetic material.

The transverse flux induction heating device allows an alternating magnetic field to intersect the sheet face of a conductive sheet which is conveyed in one direction, thereby inductively heating the conductive sheet. The transverse flux induction heating device includes a heating coil disposed such that a coil face faces the sheet face of the conductive sheet; a core around which the heating coil is coiled; and a shielding plate formed of a conductor and disposed between the core and a side end portion in a direction perpendicular to the conveyance direction of the conductive sheet, wherein the shielding plate has a protruded portion, and the side surface of the protruded portion represents a closed loop when viewed from a direction perpendicular to the coil face.

A control unit of an induction heating unit controls AC power output to a heating coil of a transverse type induction heating unit that allows an alternating magnetic field to intersect a sheet surface of a conductive sheet that is being conveyed to inductively heat the conductive sheet. The control unit includes: a magnetic energy recovery switch that outputs AC power to the heating coil; a frequency setting unit that sets an output frequency in response to at least one of the relative permeability, resistivity, and sheet thickness of the conductive sheet; and a gate control unit that controls a switching operation of the magnetic energy recovery switch on the basis of the output frequency set by the frequency setting unit.

Control unit of induction heating unit, induction heating system, and method of controlling induction heating unit

A continuous casting device for steel of the present invention includes a casting mold for casting a molten steel, a submerged entry nozzle, an electromagnetic stirring device, and an electromagnetic brake device. Further, a curved portion which is curved toward the electromagnetic stirring device is formed at least at a position where the curved portion faces the submerged entry nozzle, on each of the long side walls. Moreover, the horizontal distance between a top of the curved portion and the submerged entry nozzle in plan view is equal to or more than 35 mm and less than 50 mm.

Continuous casting apparatus for steel

There is provided an induction heating apparatus which continuously heats a steel plate using a solenoid system. The induction heating apparatus () includes: at least three heating coils (A toD) disposed along a longitudinal direction of the steel plate to make the steel plate () pass through an inside thereof; and inductance adjusters (A toD) disposed on electrical pathways () electrically connecting each of the heating coils and a power source applying a voltage to each of the heating coils and capable of generating self-induction and adjusting self-inductance in the self-induction, in which each of the inductance adjusters is disposed to cause a generation of mutual induction at least between the inductance adjusters mutually adjacent to one another.

Induction heating apparatus and induction heating method

This invention provides a steel pipe material weld zone heating method and apparatus for melting and welding the weld zone of a steel pipe material that during continuous induction heating and welding of moving steel pipe material as the material being heated controls temperature distribution and molten steel shape and weld frequency fluctuation with high accuracy and high efficiency, irrespective of the shape of the heated region of material being heated or the material properties of the material being heated, which comprises a first imaging device, a weld zone temperature distribution computation device, a heating control device, and a variable frequency alternating current power supply device.

Steel pipe material weld zone heating apparatus and method

Continuous casting method and apparatus

Analysis of an electromagnetic field in a region including an electric conductor having an arbitrary shape is efficiently and accurately performed with a computer. A value of electric potential at a predetermined portion of the electric conductor or a value of the normal component of an electric current density vector to the cross section of a predetermined portion of the electric conductor is used as an initial condition. The distribution of exciting current density vectors in the electric conductor is obtained form the initial condition so as to meet the condition of continuity of electric current. The electromagnetic field of the region is analyzed by using the obtained distribution of exciting current density vectors.

Method for analyzing electromagnetic field

Growing community of inventors

Tokyo, Japan

Kenji Umetsu