摘要:
There is provided an induction heating apparatus which continuously heats a steel plate using a solenoid system. The induction heating apparatus (1) includes: at least three heating coils (10A to 10D) disposed along a longitudinal direction of the steel plate to make the steel plate (2) pass through an inside thereof; and inductance adjusters (12A to 12D) disposed on electrical pathways (11) 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.
摘要:
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 step in which first imaging means 3 installed opposite an end face weld zone of the steel pipe material is used to detect self-emitted light of the weld zone and output a brightness image, a weld zone temperature distribution computation step in which image processing is performed based on the brightness image and emitted light temperature measurement is applied to compute the plate-thickness direction temperature distribution of the weld zone, a heating control step in which a criterion defined in advance for the relationship between alternating current frequency and plate-thickness direction temperature distribution is used to determine the frequency of the alternating current based on the plate-thickness direction temperature distribution, and a step in which the variable frequency alternating current power supply 1 is used to pass through the steel pipe material 10 alternating current of the frequency determined in the heating control step.
摘要:
Coils (230, 330) are respectively arranged on a front side and a rear side of a planned conveyance plane (CP). Main cores (211, 311), edge cores (212, 213, 312, 313), and bridge cores (220a, 220b, 320a, 330b) are arranged with respect to the coils (230, 330). The bridge cores (220a, 220b, 320a, 330b) are arranged on a back side of the main cores (211, 311) and the edge cores (212, 213, 312, 313). The main cores (211, 311) and the edge cores (212, 213, 312, 313) can be magnetically coupled by using the bridge cores (220a, 220b, 320a, 320b).
摘要:
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.
摘要:
Coils (220, 320) are respectively arranged on a front side and a rear side of a planned conveyance plane (CP). Non-edge cores (211, 311) and edge cores (212-213, 312-313) are arranged with respect to the coils (220, 320). The non-edge cores (211, 311) are so-called T-shaped cores, and arranged at center regions in an x-axis direction. Two edge cores (212-213, 312-313) are so-called E-shaped cores, and arranged on both sides in the x-axis direction of the non-edge cores (211, 311), respectively. An interval between upstream-side leg portions (2122, 3122) and downstream-side leg portions (2123, 3123) provided to the edge cores (212, 313) and the planned conveyance plane (CP), is shorter than an interval between parts of the non-edge cores (211, 311) except for center leg portions (2111, 3111) thereof and the planned conveyance plane (CP).
摘要:
A method and an apparatus for continuously casting a metal slab made of steel are provided for uniformly circulating molten metal on a meniscus in a mold. The cast metal slab has no surface defect such as a slitting. On the meniscus, the method and apparatus operates to generate electromagnetic stirring thrusts along two long mold sides, these thrusts being opposed to each other. The thrust oriented from a dipping nozzle to the short mold side is made larger than the thrust oriented from the short mold side to the dipping nozzle. A circuit for connecting each coil of a shifting field electromagnetic stirring coil part with a three-phase power supply is symmetric to another circuit with respect to the dipping nozzle. The circuit is divided into two parts along each long mold side. The divided circuit parts are located in parallel but have respective impedances.