An apparatus and method for detecting surface defects on a...

G - Physics – 01 – N

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G01N 21/95 (2006.01) G01B 11/30 (2006.01) G01N 21/952 (2006.01) H04N 7/18 (2006.01)

Patent

CA 2507252

The present invention is directed to solving the problems associated with the detection of surface defects on metal bars as well as the problems associated with applying metal flat inspection systems to metal bars for non-destructive surface defects detection. A specially designed imaging system, which is comprised of a computing unit, line lights and high data rate line scan cameras, is developed for the aforementioned purpose. The target application is the metal bars (1) that have a circumference/cross-section-area ratio equal to or smaller than 4.25 when the cross section area is unity for the given shape, (2) whose cross-sections are round, oval, or in the shape of a polygon, and (3) are manufactured by mechanically crosssection reduction processes. The said metal can be steel, stainless steel, aluminum, copper, bronze, titanium, nickel, and so forth, and/or their alloys. The said metal bars can be at the temperature when they are being manufactured.

L'invention concerne la solution des problèmes liés à la détection de défauts de surface sur des barres métallique ainsi que des problèmes liés à l'application de système d'inspection de plat métallique aux barres métalliques aux fins de la détection non destructive de défauts de surface. Dans ce but, on a élaboré un système d'imagerie spécialement conçu, qui comprend une unité informatique, des lumières linéaires et des caméras de balayage en ligne à haut débit binaire. Les barres métalliques, (1) qui sont l'application cible, ont un rapport circonférence/aire transversale égal ou inférieur à 4,25 lorsque l'aire transversale est l'unité pour la forme donnée, (2) dont les sections transversales sont rondes, ovales ou polygonales, et (3) qui sont fabriquées par des procédés de réduction mécanique de section transversale. En ce qui concerne le métal, il peut s'agir notamment d'acier, d'acier inoxydable, d'aluminium, de cuivre, de bronze, de titane et de nickel, et/ou de leurs alliages. Ces barres métalliques peuvent être à la température de leur fabrication.

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