Method for manufacturing a plug-type chamber used in the...

B - Operations – Transporting – 21 – C

Patent

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Details

B21C 25/10 (2006.01) B21C 1/24 (2006.01)

Patent

CA 2115858

A method and apparatus for manufacturing a plug-type chamber to accommodate at least two floating plugs for use in the cascade drawing of tubes are disclosed. A starting tube is first fixed in position by a clamping and denting device. A necking-down ring is subsequently moved with the help of a necking-down cylinder along a freely projecting end section of the starting tube. A punch is then pushed with the help of a cylinder into the end section of the tube. When the punch has reached its end position, the necking-down ring is pulled over the end section of the tube, and the outside diameter is reduced to its original size. The punch is subsequently removed, and two indentations are made on the periphery of the end section of the starting tube with the help of the clamping and denting device. Together with a drawing point produced through the reshaping of the unattached end of the starting tube, these indentations then form a plug-type chamber, in which several floating plugs are embedded, which interact with drawing dies during the cascade drawing operation.

La présente invention vise une méthode et un appareil servant à fabriquer un logement conique pouvant recevoir au moins deux obturateurs coniques flottants utilisés dans le procédé d'étirage de tubes en cascade. Un tube de départ est d'abord fixé en place à l'aide d'un dispositif de serrage et d'entaillage. Une bague de recalibrage est par la suite glissée au moyen d'un cylindre de calibrage le long du tube de départ, le long d'une de ses extrémités faisant saillie. Un cylindre pousse ensuite un poinçon à l'intérieur de l'extrémité du tube. Lorsque le poinçon a atteint sa position finale, la bague de recalibrage est glissée par-dessus l'extrémité du tube pour en réduire le diamètre extérieur à sa taille initiale. Le poinçon est ensuite retiré et deux entailles sont réalisées, à l'aide du dispositif de serrage et d'entaillage, sur le pourtour de l'extrémité du tube de départ. Associées à une pointe d'étirage produite lors du reprofilage de l'extrémité libre du tube de départ, ces entailles forment un logement conique dans lequel viennent s'insérer des obturateurs coniques flottants qui interagissent avec des matrices d'étirage pendant les opérations d'étirage en cascade.

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