Jfe Steel Corporation

Nkk Corporation

Other

Junichi Yotsuji

Shigehiro Takajo

Hiroi Yamaguchi

Akio Nagamune

Kazuhiro Hanazawa

Tomohiko Ito

Yuki Takaki

Yasunari Koga

Masaki Kobayashi

Taku Watanabe

Yoshihiro Murakami

Hiroharu Kato

Takafumi Ozeki

Kenichi Iwanaga

Hideki Takada

Yasuo Tomura

Kozo Maeda

Hiriharu Kato

An inspection apparatus for coke oven construction that is configured to check accuracy after refractories are laid in oven construction work for updating or newly creating a coke oven that produces coke. The inspection apparatus includes an image capturing device configured to acquire an image of a work area where oven construction work is in progress, measurement region determining means configured to identify a work-completed area where laying work has been completed on the basis of the image of the work area acquired by the image capturing device, and determine the identified work-completed area as a measurement region, and a refractory position measuring device configured to check laying accuracy by measuring positions of laid refractories in the measurement region determined by the measurement region determining means.

Inspection apparatus and inspection method for coke oven construction, and coke oven construction method

An object is to provide a lifting-magnet attachment magnetic pole unit, a lifting magnet, a steel material conveying method, and a steel plate manufacturing method with which only one or a desired pieces of steel materials can be held. The present invention is a lifting-magnet attachment magnetic pole unit for a lifting magnet used to lift and convey a steel material with magnetic force. The lifting-magnet attachment magnetic pole unit includes a first split magnetic pole that is in contact with an iron core of the lifting magnet and has a branched structure, and a second split magnetic pole that is in contact with a yoke of the lifting magnet and has a branched structure. The first and second split magnetic poles are alternately arranged.

Lifting-magnet attachment magnetic pole unit, steel-lifting magnetic-pole-equipped lifting magnet, steel material conveying method, and steel plate manufacturing method

A steel sheet inspection device includes: a magnetooptic element that is able to detect, as an optical property, a magnetic domain structure of a steel sheet to be inspected; a light source that irradiates the magnetooptic element with linearly polarized light; a detector that detects the linearly polarized light with a polarization plane rotated according to the magnetic domain structure of the steel sheet transferred to the magnetooptic element; and a drive mechanism that drives at least the magnetooptic element so as to contact and separate the steel sheet and the magnetooptic element with and from each other.

Steel sheet inspection device, steel sheet inspection method, and steel sheet manufacturing method

An electron gun abnormality detecting device for detecting an abnormality in first and second electron guns of a magnetic domain refining device for an electrical steel sheet includes: a magnetooptic element configured to contact with and separate from an inspection region set to include a boundary between a magnetic domain discontinuity generated by irradiation of a surface of the electrical steel sheet with an electron beam by the first electron gun and a magnetic domain discontinuity generated by irradiation thereof with an electron beam by the second electron gun, and configured to detect a steel sheet magnetic domain structure in the inspection region as an optical property; a light source configured to irradiate the magnetooptic element with linearly polarized light; and a detector configured to detect polarized light rotated by the steel sheet magnetic domain structure transferred to the magnetooptic element.

Electron gun abnormality detecting device and electron gun abnormality detecting method

The present invention provides a leakage flux flaw detecting method in which a ferromagnetic substance such as a steel sheet or coil is magnetized by a plurality of magnetic fields with different intensity and magnetic flux leaking from the ferromagnetic substance having been magnetized is detected by a magnetic sensor, and output signals of the magnetic sensor after the detection of leakage flux are processed so that a signal caused by a flaw in the ferromagnetic substance is highlighted. Since this leakage flux flaw detecting method makes it possible to detect flaws with high accuracy, a scaled or descaled hot rolled steel sheet or coil in which the accurate flaw information such as location, density, size, and the like is known can be provided by applying this method to the manufacturing of hot rolled steel sheet or coil.

Leakage flux flaw detecting method and method for manufacturing hot rolled steel sheet using the same

Magnetic flaw detection apparatus using an E-shaped magnetic sensor and

Growing community of inventors

Tokyo, Japan

Junichi Yotsuji