Apparatus for pipe end sizing and method for pipe end sizing

Details Apparatus for pipe end sizing and method for pipe end sizing Apparatus for pipe end sizing and method for pipe end sizing

B - Operations, Transporting

21

D

B21D 3/14 (2006.01) B21D 41/02 (2006.01)

Patent

CA 2645932

A metal tube end correcting apparatus comprises a plug (3) for enlarging the end of a metal tube (1), a chuck (2) for fixing the metal tube (1), and a movement means for moving the position of the plug (3) and/or the chuck (2). The plug (3) has a circular cross section, and has a tapered part (31) and a equal-diameter part (32) continuously formed in this order from its end. The outer diameter of the tapered part (31) is gradually increased from the front end to the rear end. The plug meets the following expressions (1) and (2). The chuck (2) can change the fixed position of the metal tube (1). The apparatus can correct the inner diameter of the metal tube end with an excellent dimensional accuracy. 22 <= LR/(D1 x 0.01/2) <= 115 ... (1) R2 >= R1 ... (2)

L'invention concerne un appareil de correction d'extrémité de tube métallique comprenant un bouchon (3) permettant d'agrandir l'extrémité d'un tube de métal (1), un mandrin (2) permettant de fixer le tube de métal (1), et un moyen de déplacement permettant de déplacer la position du bouchon (3) et/ou du mandrin (2). Le bouchon (3) possède une coupe transversale circulaire, et possède une pièce effilée (31) et une pièce de diamètre régulier (32) formées de manière continue dans cet ordre depuis l'extrémité. Le diamètre externe de la pièce effilée (31) augmente progressivement depuis l'extrémité avant vers l'extrémité arrière. Le bouchon satisfait aux expressions (1) et (2) suivantes. Le mandrin (2) peut modifier la position fixe du tube de métal (1). L'appareil peut corriger le diamètre interne de l'extrémité du tube de métal avec une excellente précision des cotes. 22 = LR/(D1 x 0,01/2) = 115 ... (1) R2 = R1 ... (2)

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