METHOD AND DEVICE FOR DETECTING SURFACE DEFECT OF SLAB

PROBLEM TO BE SOLVED: To provide a method for detecting a surface defect of a slab for precisely detecting the surface defect such as slag biting produced in the slab. SOLUTION: In the method for detecting the surface defect of the slab by measuring the surface unevenness state of the slab by irradi...

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Bibliographische Detailangaben
Hauptverfasser:	TOMURA YASUO, KUSUMOTO YOSHIHARU
Format:	Patent
Sprache:	eng
Schlagworte:	AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PHYSICS POWDER METALLURGY PUNCHING METAL TESTING TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for detecting a surface defect of a slab for precisely detecting the surface defect such as slag biting produced in the slab. SOLUTION: In the method for detecting the surface defect of the slab by measuring the surface unevenness state of the slab by irradiating the surface of the slab 6 with a laser beam 8, the laser beam reflected from the surface of the slab 6 is detected by a laser beam detector 9 and the sinal output from the laser beam detector 9 is supplied to a surface unevenness state measuring circuit 10. The signal output from the surface unevenness state measuring circuit 10 is supplied to an unevenness change ratio calculating circuit 11 to calculate the unevenness change ratio in the longitudinal direction of the slab and the unevenness change ratio calculated by the unevenness change ratio calculating circuit 11 is compared with a predetermined threshold value by a determination device 12 to determine the region, where the absolute value of the unevenness change ratio becomes the threshold value or above, of the slab, as the surface defect region of the slab. COPYRIGHT: (C)2010,JPO&INPIT