B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 28/28 (2006.01) B21D 26/02 (2006.01)
Patent
CA 2452168
A method for piercing a tube during liquid impact forming or hydroforming to form a hole with minimal deformation in the material surrounding the hole. The method includes the steps of: (1) filling the tube with liquid; (2) stamping the tube thereby increasing the pressure of the liquid within the tube; (3) piercing the tube while the pressure is elevated with a tapered punch whereby the material around the pierced hole is pushed back toward the die wall due to the elevated internal pressure of the tube; and (4) retracting the tapered punch from the tube with the face of the punch catching on the tube wall to pull the material back toward the die wall.
Cette invention a trait à un procédé de perçage de tube par choc liquide ou hydroformage, afin de ménager un trou avec une déformation minimale du matériau entourant ce trou. Le procédé consiste, (1), à remplir le tube de liquide, (2), à l'emboutir pour augmenter la pression du liquide, (3), à le percer alors que la pression y régnant est élevée, au moyen d'un poinçon effilé, de ce fait, le matériau entourant le trou est refoulé vers la paroi de la matrice en raison de la pression élevée régnant dans le tube et, (4), à retirer ce poinçon du tube, la surface du poinçon appuyant sur la paroi du tube afin d'entraîner le matériau vers la paroi de la matrice.
Ash Stanley P.
Bush Theodore L.
Hartway Dale A.
Borden Ladner Gervais Llp
Greenville Tool & Die Company
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