Seamless metal tube producing method

B - Operations – Transporting – 21 – B

Patent

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Details

B21B 19/04 (2006.01) B21B 25/00 (2006.01)

Patent

CA 2508446

The present invention relates to a making method for a seamless metallic tube with a tilting roll type piercing rolling mill (piercer). According to the making method for a seamless metallic tube of the present invention, the rotary forging effect and the circumferential shearing strain can be significantly suppressed without generating uncompleted engagement of a billet. Accordingly, a product having reduced inside defects and excellent inside quality can be produced in high productivity. Further, by strengthening a plug nose rolling portion, a sharpened plug nose is obtained and an engagement limit can be increased. Additionally, a product further excellent in the inside quality can be efficiently produced. Accordingly, the present invention can be applied to wide fields of the piercing rolling of the seamless metallic tube.

L'invention porte sur un procédé de laminage-perçage pour la formation de tubes métalliques sans soudure, ce procédé utilisant un laminoir perceur de type à rouleau incliné capable de supprimer considérablement la rupture de Mannesmann ou la déformation de cisaillement circonférentiel sans provoquer de panne au cours de l'amenée des billettes. Ceci permet d'obtenir un produit présentant une bonne qualité de surface interne, c'est-à-dire présentant peu de dartres sur cette surface, et avec un niveau de productivité élevé. Le renforcement de la section de laminage à extrémité avant d'un manchon permet d'affûter le manchon, d'augmenter la limite d'amenée et de produire également avec efficacité un produit dont la surface interne présente une meilleure qualité. Ce procédé peut ainsi s'appliquer à une large plage d'opérations dans le laminage-perçage de tubes métalliques sans soudure.

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