Machining of a memory metal

Details Machining of a memory metal Machining of a memory metal

B - Operations, Transporting

21

C

B21C 23/08 (2006.01) B21C 23/22 (2006.01)

Patent

CA 2206310

A NiTi-based tube of memory metal is produced by extrusion, whereby: a) one starts off from a blank of a memory metal; b) a central hole is drilled in said blank; c) a core is introduced into the central hole, whereafter the blank is encased by a casing, and preferably also by two gables, whereby the blank is excluded from the surrounding atmosphere; d) the encased blank is heated and extruded; e) the ends of the extruded blank are removed; and f) also the core and the surrounding casing is removed. In this way, it has been accomplished to produce NiTi-based tubes of memory metal of hitherto unattained length, such as >= 1/2 m.

On fabrique par extrusion un tube en métal à mémoire à base de NiTi, ce qui consiste à: a) commencer à partir d'une ébauche de métal à mémoire; b) pratiquer un perçage central dans ladite ébauche; c) introduire un noyau dans le perçage central, l'ébauche étant encastrée dans une enveloppe et entourée également, de préférence, par deux pignons, ce qui l'isole de l'atmosphère ambiante; d) chauffer et extruder l'ébauche encastrée; e) supprimer les extrémités de l'ébauche extrudée; f) supprimer également le noyau et l'enveloppe. Ceci permet de fabriquer des tubes en métal à mémoire à base de NiTi d'une longueur inégalée jusqu'à présent, telle que >= 1/2 m.

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