Method for detecting pinholes in continuously cast billets

Details Method for detecting pinholes in continuously cast billets Method for detecting pinholes in continuously cast billets

G - Physics

01

N

G01N 21/88 (2006.01) B22D 2/00 (2006.01) G01N 21/894 (2006.01)

Patent

CA 2083449

ABSTRACT The present application relates to a method for detection of pinholes in continuously cast metal billets wherein the continuously cast metal billets are continuously passed by a symmetric light source comprising a plurality of single light sources arranged in a circle or in another way such that the light falls substantially symmetrical on the part of the surface of the metal billet which is to be detected, in such a way that the surface of the metal billet which faces the light source is illuminated except for pinholes, reflected light from the surface of the billet is detected by means of a linescan camera arranged centrally in relation to the light source, which camera has a scanning direction normal to the direction of movement of the metal billet, whereby pinholes are detected by registration of reflected light intensity below a preset treshold value.

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