Method and device for optically measuring external threads

G - Physics – 01 – B

Patent

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Details

G01B 11/24 (2006.01)

Patent

CA 2683551

The invention relates to a method and device for optically measuring external thread profiles, particularly at the ends of pipes, wherein the thread is previously synchronously produced in a production line and is continuously measured in line from start to finish of the thread prior to further processing. The aim of the invention is to allow cost-effective inspection of the thread during synchronous production of the thread. For this purpose, the profile of the previously produced thread is illuminated and/or scanned tangentially to the pipe cross section by means of a relative movement including rotation and translation, and by an optical measuring unit comprising a camera, and the scanning speed is adjusted such that the time for scanning the thread profile, considering the required local resolution of the camera, is within the cycle time for the production of the next thread, wherein the image of the thread contour is captured by the camera and the optical signals are then evaluated and compared to target specifications.

Procédé et dispositif destinés à la mesure optique du profil de filets extérieurs. L'invention concerne un procédé destiné à la mesure optique du profil de filets extérieurs, en particulier à l'extrémité de tubes, le filet étant d'abord généré avec une certaine cadence sur une chaîne de fabrication et, avant la poursuite de l'usinage, il est mesuré continuellement en ligne du début à la fin du filet. L'objectif est de permettre une vérification économique des filets lors de leur fabrication cadencée. Pour cela, le profil du filet fabriqué auparavant est éclairé ou balayé, tangentiellement à la section transversale du tube, selon un déplacement relatif se composant d'une rotation et d'une translation et au moyen d'une unité de mesure optique se composant d'une caméra, et la vitesse de balayage est réglée de sorte que le temps de balayage du profil du filet, en tenant compte de la résolution locale nécessaire de la caméra, soit inférieur à la cadence de production pour la fabrication du filet suivant, l'image du contour du filet étant saisie par la caméra et les signaux optiques étant ensuite évalués, puis comparés à des données de consigne.

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