Jfe Steel Corporation

Kawasaki Steel Corporation

Toshifumi Kodama

Takatoshi Okabe

Akira Torao

Hiroaki Ono

Akihiro Ogawa

Yukinori Iizuka

Taira Suzuki

Yasumasa Tekemura

Koji Yano

Masahito Suzuki

Shigeto Sakashita

Naoshi Yamahira

Takahiro Koshihara

Yusuke Tanaka

Yukio Takahashi

Shuichi Sato

Kenji Oi

Shota Amano

Yasuyuki Morikawa

Hiroto Kase

Shinji Tomiyama

A molten metal component estimation device including: an input device configured to receive measurement information about a refining facility including measurement results regarding an optical characteristic; a model database that stores model expressions and model parameters, regarding a blowing process reaction, including a model expression and model parameters representing a relation between the oxygen efficiency in decarburization and a carbon concentration in a molten metal in the refining facility; and a processor configured to: estimate component concentrations of the molten metal including the carbon concentration in the molten metal by using the measurement information, the model expressions and the model parameters; estimate the carbon concentration in the molten metal based on the measurement results; and determine the model expression and the model parameters to be used when estimating the component concentrations of the molten metal, based on the estimation result of the carbon concentration in the molten metal.

Molten metal component estimation device, method of estimating molten metal component, and method of manufacturing molten metal

A method of monitoring a manufacturing status of an electric resistance welded pipe manufactured by shaping a steel strip into a pipe and butt welding both end parts of the steel strip in a width direction along a lengthwise direction includes: arranging an imaging unit in a gas shield nozzle having an opening opposing a region in which both of the end parts of the steel strip in the width direction are butt welded and shielding the region with inert gas by ejecting the inert gas onto the region through the opening, the imaging unit having a visual filed including the region; and determining quality of a butt-welded part based on an image shot by the imaging unit.

Method of monitoring manufacturing status of electric resistance welded pipe, device for monitoring manufacturing status of electric resistance welded pipe, and method of manufacturing electric resistance welded pipe

A detecting method of optically detecting a surface defect of a moving steel material includes an irradiation step of irradiating an examination target part with illumination light beams from different directions by two or more distinguishable light sources whose light emission durations are set based on at least an allowable positional displacement of an image, the two or more distinguishable light sources repeatedly emitting light such that their light emission timings thereof do not overlap each other; and a detection step of obtaining images by reflected light beams of the respective illumination light beams and detecting a surface defect in the examination target part by executing subtraction processing between the obtained images.

Surface defect detecting method and surface defect detecting apparatus

A surface inspection method for a steel pipe detects a surface defect on a hot steel pipe, and includes: an imaging step of imaging a self-luminous image of the hot steel pipe; a correcting step of making more uniform luminance variation in a circumferential direction of the self-luminous image and correcting the self-luminous image; and a detecting step of detecting a surface defect based on the self-luminous image corrected at the correcting step.

Surface inspection method, surface inspection device, manufacturing system, method of identifying defect formed area, and manufacturing method of steel pipe

A surface defect detecting method of optically detecting a surface defect of a steel material includes: an irradiation step of irradiating an examination target part with illumination light beams from different directions by using two or more distinguishable light sources; and a detection step of obtaining images by reflected light beams of the respective illumination light beams and detecting a surface defect in the examination target part by executing subtraction processing between the obtained images.

A method of detecting an abnormality in a blast furnace, wherein the abnormality causes clogging of a tuyere unit of the blast furnace, the method including capturing an image of a raceway unit through an in-furnace monitor window disposed at the tuyere unit; and determining that the abnormality has occurred when a brightness of the captured image is lower than or equal to a predetermined brightness threshold and a rate of decrease in the brightness is lower than or equal to a predetermined brightness-decrease-rate threshold.

Method of detecting abnormality at blast furnace and method of operating blast furnace

A laser beam welding diagnosis apparatus includes: an imaging unit configured to capture images of a laser beam welding penetration side of a laser beam welded portion at a predetermined time interval; a feature amount calculating unit configured to calculate, from an image captured by the imaging unit, a feature amount of a jetted portion accompanying laser beam welding penetration; a welding diagnosis unit configured to determine that a welding defect in the laser beam welded portion has occurred when values of the feature amounts of a predetermined area around the laser beam welded portion on the laser beam welding penetration side become equal to or less than a predetermined value for a predetermined duration or longer; and an output unit configured to output a welding quality state including the occurrence of the welding defect.

Laser beam welding diagnosis apparatus and laser beam welding diagnosis method

An oven wall shape measuring apparatus includes: a slit laser light source that is arranged in a thermally-insulated protection box having a slit-like window and emits slit-like laser light; a laser light mirror that reflects the laser light and irradiates an oven wall surface with the laser light via the window; an imaging mirror that reflects reflected light due to irradiation of the laser light and self-emitting light emitted from the oven wall surface, the reflected light and the self-emitting light entering the thermally-insulated protection box via the window; and an imaging device that images, via an optical filter, the self-emitting light and the reflected light that are reflected from the imaging mirror.

Oven wall shape measuring apparatus, oven wall shape measuring system, and oven wall shape measuring method

A welding position detecting apparatus for laser beam welding includes: an imaging device that captures, at a predetermined time interval, images of an irradiated portion of a welding material irradiated with a welding laser beam, and a surrounding area thereof, of a welding material; an image processing device that identifies a position of the irradiated portion irradiated with the welding laser beam by performing image processing calculating, from two or more images acquired by the imaging device, a direction and an amount of parallel movement of points in the images; and a display device that displays the position of the irradiated portion irradiated with the welding laser beam, the position being identified by the image processing device.

Welding position detecting apparatus and welding position detecting method for laser beam welding

There is provided a method for manufacturing a laser welded steel pipe in which the status of laser welding is accurately assessed, and the assessment is used to modify welding conditions, so that laser welded steel pipes can be manufactured at a high yield rate and in a stable manner. Irradiation point(s) of laser beam(s), with which the longitudinal edges are irradiated from the side of the outer surface, are monitored from the side of the inner surface of an open pipe, and then conditions of welding with the laser beam(s) are assessed to be kept unchanged if any keyhole is found penetrating out of the inner surface of the open pipe, or modified if no keyhole is found penetrating out of the inner surface of the open pipe.

Method for manufacturing a laser welded steel pipe

To precisely measure bead cutting shapes of electric resistance welded pipes without being affected by difference in luminance level between cut and uncut portions in optical cutting images, an image is obtained by overlaying an optical cutting image with the optical cutting image subjected to thinning processing. A profile of the welded pipe is approximated with a quadratic function and a region containing the bead apex coordinates is identified as the bead. Shape data of the pipe surface at the portion corresponding to the bead portion is obtained from the preset left and right boundaries of the bead portion and the apex position of the separately-calculated bead portion, and bead width, height, slope angle, and unevenness at the left and right boundaries between the bead portion and base pipe portion, are each calculated, based on the left and right bead shape approximation functions and base pipe shape approximation function.

Measurement method and device for bead cutting shape in electric resistance welded pipes

Method and instrument for measuring bead cutting shape of electric welded tube

The present invention relates to a method for detecting chattering of a cold rolling mill rapidly and accurately, which occurs during cold rolling of a steel strips. The occurrence of the chattering is detected by a plurality of acoustic parameters derived from a sound measured in the vicinity of the cold rolling mill during the rolling. The acoustic parameters are the frequency range characteristic of the occurrence of the chattering, the acoustic intensities in the frequency bands which are n-th harmonics, the peak frequency of the acoustic frequency component distribution, the resonance factor, the peak intensity, and the like. A plurality of parameters may be provided by measuring and calculating the same parameter with different timing.

Growing community of inventors

Tokyo, Japan

Toshifumi Kodama