WO2008078913A1 - Dispositif et procédé pour la détection en ligne de partie de soudage de bande d'acier - Google Patents

Dispositif et procédé pour la détection en ligne de partie de soudage de bande d'acier Download PDF

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Publication number
WO2008078913A1
WO2008078913A1 PCT/KR2007/006718 KR2007006718W WO2008078913A1 WO 2008078913 A1 WO2008078913 A1 WO 2008078913A1 KR 2007006718 W KR2007006718 W KR 2007006718W WO 2008078913 A1 WO2008078913 A1 WO 2008078913A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel strip
welding part
reflectivity
laser
laser beams
Prior art date
Application number
PCT/KR2007/006718
Other languages
English (en)
Inventor
Choong Soo Lim
Sun Kyoo Lim
Sang Jin Lee
Ki Jang Oh
Original Assignee
Posco
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Posco filed Critical Posco
Publication of WO2008078913A1 publication Critical patent/WO2008078913A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
    • G01B11/303—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces using photoelectric detection means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/26—Seam welding of rectilinear seams
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity

Definitions

  • the present invention relates to an apparatus and method for on-line detecting a welding part of a steel strip, and more particularly, to an apparatus and method for online detecting a welding part of a steel strip that irradiates a plurality of laser beams at an angle with respect to a width direction of the steel strip being transferred and analyzes signal waveforms of the reflected laser beams to measure the welding part of the steel strip.
  • Background Art
  • unit coils are welded at an initial step of the rolling to perform a continuous rolling process of a steel strip, and the welded coils are separated into unit coils by cutting off welding parts at a final step of the rolling process.
  • the separated unit coils are transferred for a subsequent cold rolling process or are released as products. Therefore, in the cold rolling process, automatic control of equipment, the cutting of the welding parts at a delivery side, and detection of positions of the welding parts to cut the steel strip into unit coils are important.
  • FIG. 1 A method of detecting a welding part during cold rolling in a steel mill according to the related art will now be described.
  • a steel strip 1 is welded, a hole 5 is bored through a welding part 2, light is irradiated onto a position at which the welding part needs to be detected by using an optical projector 3 located above the steel strip 1, and light passing through the hole 5 is detected by using an optical detector 4 located below the steel strip, such that the welding part 2 is detected.
  • the hole 5 is bored through the welding part 2 to detect the welding part 2 to detect the welding part 2
  • the time spent boring the hole 5 is wasted.
  • defects mark formed by a foreign material
  • An aspect of the present invention provides an apparatus and method of on-line detecting a welding part of a steel strip that can maximize a rate of detecting the welding part of the steel strip by irradiating a plurality of laser beams arranged in a line at an angle with respect to a width length of the steel strip being transferred, measuring a change in reflectivity of the reflected laser beams, and analyzing a plurality of sequential pulse reflectivity signals generated when passing through the welding part.
  • an apparatus for on-line detecting a welding part of a steel strip that irradiates laser beams onto the surface of the steel strip and measures reflectivity of the reflected laser beams to detect the welding part of the steel strip
  • the apparatus including: n number of laser reflectivity measuring units arranged in a line at predetermined intervals to form a predetermined angle ⁇ with respect to a width direction of the steel strip being transferred, wherein each of the laser reflectivity measuring units irradiates a laser beam onto the surface of the steel strip and measures the reflectivity of the steel strip on the basis of the laser beam reflected from the surface of the steel strip; and a signal processing unit detecting the welding part of the steel strip when n number of measured reflectivity patterns are sequentially repeated according to the laser reflectivity measuring units.
  • Each of the laser reflectivity measuring units may irradiates the laser beam having a smaller diameter than a width of the welding part of the steel strip onto the surface of the steel strip.
  • the signal processing unit may detect the welding part of the steel strip.
  • the angle ⁇ with respect to the width direction of the steel strip that is formed by the plurality of laser reflectivity measuring units arranged in the line may have a value within a range of 1 to 60°.
  • the signal processing unit may determine the welding part on the basis of time intervals between the reflectivity patterns generated when the n number of laser beams pass through the welding part.
  • Each of the laser reflectivity measuring units may irradiate the laser beam onto the surface of the steel strip in a perpendicular direction to the surface thereof.
  • Each of the laser reflectivity measuring units may include a laser beam generator generating the laser beam, a condenser lens condensing the generated laser beam, a collector lens collecting the laser beam reflected from the surface of the steel strip, and an optical detector converting the collected reflected light into an electrical signal corresponding to the reflectivity of the reflected light.
  • a method of on-line detecting a welding part of a steel strip that irradiates laser beams onto the surface of the steel strip and measures reflectivity of the reflected laser beams to detect the welding part of the steel strip, the method including: irradiating n number of laser beams arranged in a line at predetermined intervals onto the surface of the steel strip to form a predetermined angle ⁇ with respect to a width direction of the steel strip being transferred, detecting the n number of laser beams reflected form the surface, extracting reflectivity of each of the n number of reflected laser beams, and detecting the welding part of the steel strip when n number of signal patterns of the reflectivity are sequentially repeated according to the n number of laser beams.
  • the irradiating n number of laser beams may include generating each of laser beams, and condensing each of the laser beams and irradiating each of the laser beams onto the steel strip being transferred.
  • the irradiating n number of laser beams may include irradiating each of the laser beams onto the surface of the steel strip in a perpendicular direction to the surface thereof.
  • the irradiating n number of laser beams may include irradiating onto the surface of the steel strip, the laser beams having a smaller diameter than a width of the welding part of the steel strip.
  • the condensing each of the laser beams and irradiating each of the laser beams onto the steel strip being transferred may include detecting the welding part of the steel strip if a reflectivity increase/decrease signal having a greater level than a predetermined critical level is detected when each of the n number of laser beams is irradiated onto the steel strip.
  • a plurality of laser beams are irradiated onto a steel strip, which is being transferred in a longitudinal direction, at a predetermined angle with respect to a width direction of the steel strip, and a plurality of sequential pulse signals generated when the welding part of the steel strip passes through the laser beams are analyzed to thereby detect the welding part, such that an on-line laser welding part detection rate is maximized and thus a position of the welding part can be stably tracked in a production line.
  • FIG. 1 is a configuration view illustrating an apparatus for detecting a welding part of a steel strip that uses a hole according to the related art
  • FIG. 2 is a block diagram illustrating a configuration of an apparatus for on-line detecting a welding part of a steel strip according to an exemplary embodiment of the present invention
  • FIG. 3 is a configuration view illustrating a laser reflectivity measuring unit of the apparatus for on-line detecting a welding part of a steel strip according to the exemplary embodiment of the present invention
  • FIG. 4 is a view illustrating examples of the shape of laser beam spots condensed onto the surface of a steel strip according to an exemplary embodiment of the present invention
  • FIG. 25 is a configuration view illustrating an apparatus for detecting a welding part of a steel strip that uses a hole according to the related art
  • FIG. 2 is a block diagram illustrating a configuration of an apparatus for on-line detecting a welding part of a steel strip according to an exemplary embodiment of the present invention
  • FIG. 3 is a configuration view
  • FIG. 5 is a flowchart illustrating a method of on-line detecting a welding part of a steel strip according to an exemplary embodiment of the present invention
  • FIG. 6 is a view illustrating positions of a plurality of laser beams according to an exemplary embodiment of the present invention
  • FIG. 7 is a view illustrating welding part detecting signals according to an exemplary embodiment of the present invention.
  • FIG. 2 is a block diagram illustrating a configuration of an apparatus for on-line detecting a welding part of a steel strip according to an exemplary embodiment of the present invention.
  • an apparatus 10 for on-line detecting a welding part of a steel strip includes laser reflectivity measuring units 11 and a signal processing unit 12.
  • the laser reflectivity measuring units 11 are arranged and inclined at a predetermined angle with respect to a width length of a steel strip 1 being transferred. Further, each of the laser reflectivity measuring units 11 irradiates a laser beam onto the surface of the steel strip 1 and measures reflectivity of the reflected laser beam.
  • the signal processing unit 12 detects a welding part 2 of the steel strip 1 by using the reflectivities measured by the laser reflectivity measuring units 11. Even though five laser reflectivity measuring units 11 are shown in FIG. 2, this is only illustrative. Therefore, according to another exemplary embodiment of the invention, the number of laser reflectivity measuring units 11 may vary according to the width of the steel strip 1.
  • the plurality of laser reflectivity measuring units 11 are arranged in a line and inclined at a predetermined angle ⁇ with respect to the width direction of the steel strip
  • the angle ⁇ has a value within a range of 1 to 60°.
  • the plurality of laser reflectivity measuring units 11 include at least two laser reflectivity measuring units 11. The plurality of laser reflectivity measuring units
  • each of the laser reflectivity measuring units 11 detects a change in reflectivity of the laser beam in the welding part of the steel strip 1.
  • the laser reflectivity measuring units 11 sequentially detect a change in reflectivity in the welding part.
  • the reflectivity of the reflected light of the laser beam is an index that indicates the intensity of the laser beam reflected from the surface of the steel strip 1 being transferred.
  • the reflectivity of the reflected light varies according to reflectivity or absorbance of the steel strip itself, the material of the steel strip, surface roughness, surface curvature, the shape, and the like.
  • the signal processing unit 12 collectively analyzes the reflectivity of the reflected laser beams measured by the plurality of laser reflectivity measuring units 11, and detects the position of the welding part 2 of the steel strip 1.
  • the reflectivities (intensities) of the laser beams reflected from the surface of the steel strip 1 differ between the welding part 2 and the non- welding part. Therefore, by comparing the reflectivities between the welding part 2 and the non- welding part, it is determined whether the welding part 2 passes through parts onto which the laser beams are irradiated.
  • the signal processing unit 12 sequentially receives reflectivity signals corresponding to the reflectivities measured by the plurality of laser reflectivity measuring units 11.
  • the signal processing unit 12 determines the welding part. As such, the signal processing unit 12 uses the signal patterns according to the changes in reflectivities of the plurality of reflected light beams measured with respect to the welding part 2 of the steel strip 1 being transferred, thereby accurately detecting the welding part 2 of the steel strip 1.
  • the laser reflectivity measuring units 11 sequentially irradiate the laser beams onto the surface of the steel strip 1 at an angle within a range of 80 to 100° in order to efficiently collect the reflected laser beams. More preferably, the laser beams are irradiated to the surface of the steel strip 1 in a direction perpendicular to the surface thereof. When the laser beams are irradiated onto the steel strip at an angle close to 90°, the laser beams are also reflected at an angle to close to 90°, which makes it possible to effectively collect the reflected laser beams and advantageous to measure the reflectivity.
  • FIG. 3 is a configuration view illustrating a laser reflectivity measuring unit of the apparatus for on-line detecting a welding part of a steel strip according to the exemplary embodiment of the present invention.
  • the laser reflectivity measuring unit 11 includes a laser beam generator 111, a condenser lens 113, a collector lens 114, and an optical detector 115.
  • the laser reflectivity measuring unit 11 may further include a laser beam section controller 112.
  • the laser beam generator 111 generates a laser beam to be irradiated onto the surface of the steel strip 1 being transferred.
  • the laser beam is emitted by a semiconductor laser, such that the laser beam generator 111 according to the embodiment generates a laser beam.
  • the size of the section of the laser beam may be controlled by the laser beam section controller 112.
  • the laser beam section controller 112 is disposed between the laser beam generator 111 and the collector lens 113 so as to continuously control the size of the section of the laser beam generated by the laser beam generator 111 if necessary.
  • the condenser lens 113 condenses the laser beam whose sectional shape is controlled by the laser beam section controller 112, such that the laser beam is irradiated onto the surface of the steel strip 1 being transferred.
  • the condenser lens 113 may be composed of a spherical lens or a cylindrical lens. At this time, the shape of the laser beam to be irradiated on the steel strip may change according to the kind of the condenser lens 113.
  • the collector lens 114 collects the laser beam reflected from the surface of the steel strip 1.
  • the collector lens 114 collects the reflected laser beam diffused from the surface of the steel strip 1 such that the laser beam is transmitted to the optical detector 115.
  • the optical detector 115 receives the reflected laser beam collected by the collector lens 114, converts the collected laser beam into an electrical signal corresponding to the reflectivity of the reflected laser beam, and outputs the electrical signal. That is, preferably, the optical detector 115 outputs a predetermined electrical signal according to the intensity of the reflected laser beam.
  • a single detector or an array detector may be used as the optical detector 115. As such, the electrical signal according to the reflectivity that is output from the optical detector 115 is transmitted to the signal processing unit 12.
  • FIG. 4 is a view illustrating examples of laser beam spots condensed onto the surface of a steel strip according to an exemplary embodiment of the present invention.
  • the laser beam irradiated onto the surface of the steel strip 1 being transferred may be set to have various shapes.
  • the shape of the laser beam may be changed according to the kind of the condenser lens 113.
  • the condenser lens 113 is a spherical lens
  • the laser beam irradiated onto the surface of the steel strip 1 forms a point or circular spot as shown in (a) and (b) of FIG. 4.
  • the condenser lens 113 is a cylindrical lens
  • the laser beam forms linear spots as shown in (c) and (d) of FIG. 4.
  • the laser beam may form a rectangular shape or a crossed spot in which two lines cross each other at right angles.
  • a focal distance f of the condenser lens 113 may change according to a focal distance f of the condenser lens 113.
  • the condenser lens 113 is a spherical lens
  • the focal distance of the spherical lens is longer than a distance between the spherical lens and the surface of the steel strip
  • a diameter a of the spot becomes larger.
  • the spherical lens has the same focal distance, the larger the diameter a of the laser beam passing through the laser beam section controller 112 is, the larger the diameter a of the spot is.
  • the diameter a of the spot can be easily adjusted by the laser beam section controller 112 and the focal distance of the spherical lens.
  • the condenser lens 113 is a cylindrical lens
  • a laser beam having a linear spot is irradiated onto the surface of the steel strip 1.
  • a length Ll or L2 of the linear spot can be controlled by the laser beam section controller 112.
  • the length Ll or L2 of the linear spot is the same as the sectional size of the laser beam from the laser beam section controller 112. Therefore, in the configuration according to the embodiment of the invention, the spots having various kinds of shapes, shown in FIG. 4, can be formed on the surface of the steel strip 1 by the laser beam section controller 112 and the condenser lens 113 that is formed of the spherical lens or the cylindrical lens.
  • FIG. 5 is a flowchart illustrating a method of on-line detecting a welding part of a steel strip according to an exemplary embodiment of the present invention.
  • n number of laser reflectivity measuring units 11 that are arranged in a line at a predetermined angle ⁇ with respect to a width direction of the steel strip 1 irradiate laser beams onto the surface of the steel strip 1 (S50).
  • Each of the laser reflectivity measuring units 11 detects the laser beam reflected from the surface of the steel strip 1 (S52), and detects reflectivity with respect to the surface of the steel strip 1 (S54).
  • the laser reflectivity measuring units 11 irradiate the laser beams onto the surface of the steel strip 1 at the same time or at very short time intervals. The time of irradiating the laser beams can be controlled by an operator.
  • the laser reflectivity measuring units 11 detect n number of reflectivity signals with respect to the surface of the steel strip 1, and the n number of refectivity signals are input to the signal processing unit 12.
  • the signal processing unit 12 analyzes the n number of reflectivity signals detected by the n number of laser reflectivity measuring units 11 and determines whether the same patterns of the signals corresponding to the laser beams reflected from the welding part of the steel strip 1 are sequentially generated in response to the n number of laser beams (S56). When the same signal patterns are sequentially generated, the signal processing unit 12 determines the welding part and detects the welding part (S58). Otherwise, the signal processing unit 12 determines it is not the welding part, and each of the laser reflectivity measuring units 11 continues to detect the reflected laser beam (S52).
  • a reflectivity signal corresponding to the reflectivity of the light reflected from the welding part 2 is greater than a reflectivity signal corresponding to the reflectivity of the light reflected from the non- welding part. Therefore, when the welding part passes through the n number of laser beams, n number of reflectivities are sequentially repeated at regular intervals.
  • the signal processing unit 12 checks the reflectivity signals corresponding to the n number of reflectivities to detect the welding part. Preferably, when reflectivity increase/decrease signals that have a level higher than a predetermined threshold level are detected in the n number of reflectivity signals, the signal processing unit 12 detects the welding part of the steel strip.
  • FIG. 6 is a view illustrating positions of a plurality of laser beams according to an exemplary embodiment of the present invention.
  • the welding part 2 is formed along a width direction of the steel strip 1, and the plurality of laser reflectivity measuring units 11 are arranged in a line at a predetermined angle ⁇ with respect to the width direction. Therefore, a plurality of laser beams Dl to D5 irradiated onto the surface of the steel strip 1 are arranged in a line at the angle ⁇ with respect to the width direction of the steel strip 1.
  • the laser beams have circular spots.
  • Fig 6(a) to 6(c) illustrate a process of irradiating the plurality of laser beams Dl to
  • the plurality of laser beams Dl to D5 are not irradiated onto the welding part 2 yet.
  • the laser beam D5 located at the top is only irradiated onto the welding part 2.
  • the two top laser beams D4 and D5 have already been irradiated onto the welding part 2, and the laser beam D3 is being irradiated onto the welding part 2.
  • each of the laser beams Dl to D5 irradiated onto the surface of the steel strip 1 has a diameter smaller than a width of the welding part 2 to thereby increase a change in angle of reflection according to the shape of the welding part 2 or a change in reflectivity of each of the laser beams Dl to D5 when each of the laser beams Dl to D5 is irradiated onto the welding part 2. It becomes easier to detect the welding part 2.
  • the laser beams Dl to D5 are irradiated onto the surface of the steel strip 1, and the reflected laser beams are detected as reflectivities of the steel strip 1.
  • the laser beams are irradiated onto the welding part 2
  • a change in reflectivities is detected.
  • FIG. 6 when the laser beams Dl to D5 are irradiated onto the surface of the steel strip 1, the laser beams Dl to D5 are irradiated onto the welding part of the steel strip 1 at regular time intervals, and changes in reflectivity of the laser beams are sequentially detected. Further, when the same signal patterns are sequentially generated, the signal processing unit 12 determines the welding part.
  • FIG. 7 is a view illustrating welding part detecting signals according to an exemplary embodiment of the present invention.
  • a reflectivity signal level A at a non- welding part is significantly different from a reflectivity signal level B at a welding part.
  • a signal pattern is repeatedly generated in the plurality of laser beams Dl to D5, and at this time, it is determined as the welding part.
  • the predetermined position is determined as a position of the welding part.
  • the signal processing unit 12 determines the welding part when the reflectivity pattern is continuously generated, which increases welding part detection rate.
  • Dn denotes a distance between the welding part and each of the laser beams
  • V denotes a moving speed of a steel strip
  • n number of laser reflectivity measuring units 11 when the n number of laser reflectivity measuring units 11 irradiate the n number of laser beams Dl to Dn onto the surface of the steel strip 1, n number of continuous pulse signals can be obtained as shown in FIG. 7.
  • a time difference ⁇ T between pulses is determined by the above Equation. Therefore, when the n number of laser reflectivity measuring units 11 irradiate the n number of laser beams Dl to Dn onto the steel strip 1, and then reflectivity signals corresponding to the reflected light beams that are measured are analyzed, if n number of pulse signals are detected and time differences among the pulse signals have the same values as those obtained by the above Equation, it can be clearly determined that the welding part 2 has passed the laser beams Dl to D5.
  • the welding part 2 of the steel strip 1 when the n number of laser beams Dl to Dn are irradiated onto the surface of the steel strip 1, if a reflectivity increase/decrease signal that has a level higher than a predetermined critical level is detected, it can be determined as the welding part 2 of the steel strip 1. That is, according to a signal that shows a higher increase or decrease in reflectivity on the basis of a predetermined critical level among the reflectivity signals, it can be determined as the welding part 2. In order to differentiate a signal that may show a predetermined increase or decrease in response to a noise signal, the welding part is determined with respect to a signal that shows a greater increase or decrease than a predetermined value.

Abstract

dispositif et procédé pour la détection en ligne de partie de soudage de bande d'acier permettant d'irradier le produit sous plusieurs faisceaux laser selon un angle par rapport à la direction de la largeur de la bande en cours de transfert et d'analyser les formes d'onde de signal des faisceaux réfléchis pour mesure la partie de soudage de ladite bande. On décrit un tel dispositif agissant sur la surface de la bande en question et permettant de mesure la réflectivité des faisceaux pour la détection considérée, qui, selon un aspect de l'invention, comprend n unités de mesure de réflectivité de faisceau laser placés suivant une ligne à des intervalles préétablis pour former une angle préétabli ϑ par rapport à une direction de la largeur de ladite bande en cours de transfert, et chacune de ces unités irradie par un faisceau la surface de la bande et mesure la réflectivité de cette bande sur la base de la réflexion du faisceau laser depuis la surface de la bande, puis une unité de traitement de signal détecte la partie de soudage lorsque n profils de réflectivité mesurés sont répétés en séquence suivant les unités de mesure de réflectivité laser.
PCT/KR2007/006718 2006-12-22 2007-12-21 Dispositif et procédé pour la détection en ligne de partie de soudage de bande d'acier WO2008078913A1 (fr)

Applications Claiming Priority (2)

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KR10-2006-0133136 2006-12-22
KR1020060133136A KR20080058919A (ko) 2006-12-22 2006-12-22 강판의 용접부 온라인 검출장치 및 방법

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CN113188500A (zh) * 2021-05-18 2021-07-30 蚌埠凯盛工程技术有限公司 一种玻璃在线厚度测量装置

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KR100910090B1 (ko) * 2007-05-31 2009-07-30 주식회사 한진중공업 용접이면의 변형량 측정장치
KR20170060471A (ko) * 2015-11-24 2017-06-01 주식회사 포스코 레이저 초점 조정 장치 및 방법
CN113503828B (zh) * 2021-06-17 2024-04-05 泰州隆基乐叶光伏科技有限公司 一种焊带弯曲度测量装置及测量方法

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JPH01209307A (ja) * 1988-02-17 1989-08-23 Nippon Steel Corp 溶接部の表面形状検査方法
JPH1076336A (ja) * 1996-09-02 1998-03-24 Mori Kogyo Kk 真空二重構造体及び内筒部外面箔被覆方法
JP2000233220A (ja) * 1999-02-12 2000-08-29 Sumitomo Metal Ind Ltd 帯板の溶接部検出方法
KR20040056822A (ko) * 2002-12-24 2004-07-01 주식회사 포스코 코일 표면의 선형 요철성 결함 검출 장치

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01209307A (ja) * 1988-02-17 1989-08-23 Nippon Steel Corp 溶接部の表面形状検査方法
JPH1076336A (ja) * 1996-09-02 1998-03-24 Mori Kogyo Kk 真空二重構造体及び内筒部外面箔被覆方法
JP2000233220A (ja) * 1999-02-12 2000-08-29 Sumitomo Metal Ind Ltd 帯板の溶接部検出方法
KR20040056822A (ko) * 2002-12-24 2004-07-01 주식회사 포스코 코일 표면의 선형 요철성 결함 검출 장치

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113188500A (zh) * 2021-05-18 2021-07-30 蚌埠凯盛工程技术有限公司 一种玻璃在线厚度测量装置
CN113188500B (zh) * 2021-05-18 2022-04-08 蚌埠凯盛工程技术有限公司 一种玻璃在线厚度测量装置

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