Method and device for the deformation by hydrodynamic...

Details Method and device for the deformation by hydrodynamic... Method and device for the deformation by hydrodynamic...

B - Operations, Transporting

21

C

B21C 3/14 (2006.01) B21C 9/00 (2006.01)

Patent

CA 2318831

The invention relates to a method and device for the deformation by hydrodynamic drawing of multi-layer composite wire (8) by means of lubricant- supplied multiple drawing machines. According to said method, before the multiple drawing machine is started or restarted, directly in front of the drawing die (4) of each drawing stage a hydrostatic starting pressure acting on the drawing and other lubricant supplied thereto and on the multi-layer composite wire (6) is generated in the drawing slot by means of a heated pressure chamber (10) through which the multi-layer composite wire extends. In this way especially multi-layer composite wires (6) with a high-strength core and a soft sheath can be deformed in a high-quality manner, and during ongoing continuous drawing in a known manner hydrodynamic pressure conditions continue to be generated in the drawing slot by the entrainment of lubricant.

L'invention concerne un procédé et un dispositif pour le façonnage par tréfilage hydrodynamique de fil composite stratifié (8) au moyen de bancs de tréfilage multiple alimentés en lubrifiant. Avant la mise ou la remise en marche du banc de tréfilage multiple, immédiatement en amont de la filière (4) de chaque étage de tréfilage, une pression de démarrage hydrostatique agissant sur l'agent de tréfilage et de lubrification acheminé et sur le fil composite stratifié (6) est produite dans la fente de tréfilage à l'aide d'une chambre sous pression chauffée (10) à travers laquelle passe ledit fil composite stratifié. Il est ainsi possible de réaliser le façonnage de haute qualité de fils, notamment de fils composites stratifiés (6) présentant une âme très résistante et une gaine souple, et en outre, au cours de la poursuite du tréfilage en continu, d'une manière connue en soi, les conditions de pression hydrodynamiques se maintiennent dans la fente de tréfilage grâce à l'entraînement du lubrifiant.

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