Nkk Corporation

Nippon Kokan Kabushiki Kaisha

Mitsuaki Uesugi

Masaichi Inomata

Tsutomu Kawamura

Shoji Yoshikawa

Isamu Komine

Akira Kazama

Takahiko Oshige

Masahiro Iwabuchi

Shinichi Tomonaga

Shuji Kaneto

Shuichi Harada

Hiroyuki Sugiura

Tsuneo Suyama

Osamu Uehara

Shigemi Fukuda

Hajime Tanaka

Yasuo Kushida

Kazuo Sano

Masami Harayama

Takeo Yamada

Hiroshi Matsunaga

Eiichi Makabe

Yoshihiro Okuno

Yoichi Matsuju

Kenji Iwai

Kyusuke Maruyama

Masaru Okamura

Sotoaki Kawaguchi

Hiroyuki Shibuya

Kazumi Ota

Hirohiko Yanagita

Noboru Kawasaki

Hisashi Ito

A defect marking device includes a flaw inspection device which has a plurality of light-receiving parts that identify reflected lights coming from an inspection plane of a metal strip under two or more of optical conditions different from each other; a signal processing section that judges the presence/absence of surface flaw on the inspection plane based on a combination of reflected light components identified under these optical conditions different from each other; and a marking device which applies marking that indicates information relating to the flaw on the surface of the metal strip.

Method for marking defect and device therefor

The defect marking method comprises the steps of: installing a surface defect tester to detect surface flaw and a marker device to apply marking at defect position, in a continuous processing line of steel sheet; detecting the surface flaw on the steel sheet using the surface defect tester; determining defect name, defect grade, defect length, and defect position in the width direction of the steel sheet, on the basis of thus detected flaw information, further identifying the defect in terms of harmful defect, injudgicable defect, and harmless defect; applying tracking of the defect position for each of the harmful defect and the injudgicable defect; and applying marking to the defect position. The defect marking device comprises a defect inspection means having plurality of light-receiving parts and a signal processing section, and a marking means.

A 3-D coordinate measurement is performed in such a way that an electrooptical distance-measuring device is used to measure a linear distance to a target point set on a surface of a measurement object, an angle measuring device is used to measure shifted angles of an optical axis of the electrooptical distance-measuring device, and a 3-D coordinate of the target point is measured according to a measured distance and a measured angle after the optical axis of the electrooptical distance-measuring device has been aligned to the target point. The present method includes a coordinate recognizing step for observing a plurality of targets, recognizing a plurality of target points, and calculating approximate 3-D coordinates of the target points; a macroscopic sighting step for approximate aligning the optical axis of the electrooptical distance-measuring device; and a microscopic sighting step for aligning the optical axis of the electrooptical distance-measuring device to the one of the target points in the predetermined viewfield range.

Three-dimensional (3-D) coordinate measuring method, 3-D coordinate measuring apparatus, and large-structure building method

A method of measuring an average particle size of granules. The method computes the average particle size on the basis of an n-order moment M.sub.n of an image of granules accumulated in a pile or of the image subjected to binarization or floating binarization. The method is capable of highly accurate and stable measurement on granules having many irregularities in the surface thereof and accumulated in a pile. The method can be used to continuously measure in real time the particle size of granules in a rotary tray of a rotary tray-type rolling granulating machine thereby adjusting the feed rate of a liquid binder to automatically control the particle size.

Method of measuring average particle size of granular material

A three-dimensional curved surface shape measuring apparatus of the slit light rotating type. In accordance with a composite image .theta.(x', y') produced when a slit light is rotationally scanned with respect to a picture of an object to be measured and horizontal displacements x.sub.o and vertical displacement z.sub.o of an axis of rotation of the slit light with respect to an origin of a reference plane, a necessary computational processing is performed to determine a three-dimensional shape f(x, y) of the object surface which is free of distortion due to a perspective effect of a television camera.

Apparatus for measuring three-dimensional curved surface shapes

A three-dimensional curved surface shape measuring apparatus of the slit light linear scanning type. In accordance with a composite image u(x', y') produced by image composing means when a slit light is scanned over a surface of an object to be measured, a measured value or computed value u.sub.o (x', y') of a composite image with respect to a reference plane, a light projecting angle .theta. to the reference plane and a reference plane-television camera distance a, a necessary computational processing is performed to determine a three-dimensional curved surface shape f(x, y) of the surface of the object which is free of any distortions due to a perspective effect of the television camera.

A method and apparatus for measuring a three-dimensional curved surface shape based on a new measuring principle that a surface of an object to be measured is coded with information relating to a slit light which is used as a medium and moved or rotated at a constant speed. The manner in which a linear reflected pattern of the slit light is moved over the surface of the object to be measured is picked up by a television camera to form a composite image in which a value of each of picture elements in the image is represented by information relating to the slit light, e.g., a position, time or projection angle of the slit light at an instant that the slit light passes through one of positions on the object surface corresponding to that picture element. Then, a difference in value between each corresponding picture elements of the composite image and another composite image formed similarly with respect to a reference plane is determined to measure a three-dimensional curve surface shape of the object to be measured.

Method and apparatus for measuring a three-dimensional curved surface

An image composing apparatus adapted to produce a composite image in which a value of each of picture elements is represented by a maximum value or minimum value of the brightness of a video signal as well as a corresponding other signal at the instant of the maximum or minimum value. A composite image is formed in which a value of each of picture elements is represented by a count of synchronizing signals or an externally applied timing, position or angle indicative external input signal at an instant that the video signal attains the maximum value or the minimum value for each picture element.

Image composing apparatus

A method and apparatus adapted to measure a three-dimensional curved surface shape quantitatively with high speed. A pattern of interference fringes on a surface of an object to be measured is picked up so that while moving a reference plane (or the object to be measured) in the direction of an optical axis, the resulting video signal is processed to form a composite image in which a value of each of picture elements is represented by a position of the reference plane (or a position of the object to be measured) at an instant that one of positions on the object surface corresponding to that picture element in the image attains a maximum brightness. Then, a three-dimensional curved surface shape of the object to be measured is measured on the basis of the composite image.

An apparatus for measuring shapes, comprises a scanner, having a plurality of arms for holding an object the shape of which is to be measured, and a turntable to which one end of each of the arms is fixed; and a device for forming a silhouette image of the object including a first optical system which has an optical axis parallel to a rotating axis of the turntable and which has a light source and a light receiving unit confronting each other to allow the object to be in between the light source and the light receiving unit of the first optical system, and a second optical system which has another optical axis substantially at a right angle to the rotating axis of the turntable and which has another light source and another light receiving unit confronting each other to allow the object to be in between the light source and the light receiving unit of the second optical system. A calculating device calculates a shape of the object, based on electric signals converted from an intensity pattern of light which has been formed by the device for forming a silhouette image of the object.

Apparatus for measuring a shape

Fatigue crack position detection apparatus

A method and an apparatus for detecting a flaw on threads of a male screw, which comprises: fully applying a light from a light source onto tops, roots and flanks of threads of a male screw while rotating the male screw around the axis thereof; continuously measuring, by means of a photoelectric converter, electric signal values corresponding to variations in brightness of the male screw in the axial direction thereof during one turn of the male screw around the axis thereof; moving-averaging the thus measured electric signal values corresponding to the variations in brightness of the male screw in the axial direction thereof; determining electric signal values corresponding to variations in brightness of the male screw in the circumferential direction thereof, on the basis of the thus moving-averaged electric signal values corresponding to the variations in brightness of the male screw in the axial direction thereof; obtaining a mean square value of the thus determined electric signal values corresponding to the variations in brightness of the male screw in the circumferential direction thereof; and comparing the thus obtained mean square value with a previously set reference value to detect a flaw on the threads of the male screw.

Method and apparatus for detecting flaw on threads of male screw

Growing community of inventors

Yokosuka, Japan

Mitsuaki Uesugi