Method for producing ultra thin wall metallic tube by cold...

B - Operations – Transporting – 21 – B

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B21B 21/00 (2006.01) B21B 21/04 (2006.01)

Patent

CA 2646020

An aspect of the present invention provides a method for producing an ultra thin wall metallic tube by a cold rolling method with significant wall thickness reduction. In a method for producing the metallic tube with a cold pilger mill, a wall thickness is reduced to perform elongation while a wall thickness center diameter is expanded using a pair of rolls, which has a tapered groove die whose diameter is gradually expanded or reduced from an engaging inlet side of the roll toward a finishing outlet side thereof, and a tapered mandrel bar, whose diameter is gradually expanded from an engaging inlet side of the tapered mandrel bar toward a finishing outlet side thereof.

La présente invention se rapporte à un processus de fabrication d'un tube métallique à paroi extrêmement fine par laminage à froid par l'utilisation d'un laminoir pèlerin à froid. Le processus comprend l'utilisation de laminoirs à filières rainurées coniques dont le diamètre augmente ou diminue d'un côté entrée d'attaque au laminoir vers le côté sortie de finition et d'un mandrin conique dont le diamètre augmente du côté entrée d'attaque vers le côté sortie de finition, la réalisation d'un emboutissage impliquant une réduction de l'épaisseur de paroi tout en étendant le centre d'épaisseur de paroi d'un matériau de tube afin d'obtenir ainsi une énorme réduction d'épaisseur de paroi.

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