Internal high pressure shaping method for shaping conical...

B - Operations – Transporting – 21 – C

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Details

B21C 37/18 (2006.01) B21D 31/04 (2006.01) B21D 51/10 (2006.01)

Patent

CA 2536076

The invention relates to an internal high pressure shaping method for shaping metal tubes (5) produced from metal, especially steel, in a tool (1) that has a die cavity (2) with a complex contour. Said die cavity (2) has cylindrical sections (2a, 2b) on its two opposite ends. The tube which is conical across its entire length is inserted in such a die cavity in such a manner that it lies with its ends (5a, 5b) in the area of the cylindrical sections (2a, 2b). The sealing plugs force the ends (5a, 5b) against the cylindrical sections (2a, 2b), optionally while radially flaring them, so that they come to rest clamped between the wall of the cylindrical sections (2a, 2b) and the sealing plugs. The tube (5) is forced against the complex contour of the die cavity (2) by subjecting the tube (5) to an internal high pressure and simultaneous axial compression of the tube (5).

L'invention concerne un procédé pour le formage à haute pression interne de tubes coniques (5) en métal, notamment en acier, dans un outil (1) présentant une empreinte de moule à contour complexe (2). L'empreinte de moule (2) présente des segments cylindriques (2a, 2b) à ses deux extrémités opposées. Dans une telle empreinte de moule, le tube conique sur toute sa longueur est introduit de façon que ses extrémités (5a, 5b) soient placées dans la zone des segments cylindriques (2a, 2b). Les extrémités (5a, 5b) sont pressées au moyen des poinçons étanches contre les segments cylindriques (2a, 2b), éventuellement avec un évasement radial, de sorte qu'elles sont coincées entre la paroi des segments cylindriques (2a, 2b) et les poinçons étanches. Le tube (5) est repoussé contre le contour complexe de l'empreinte de moule (2) par mise sous haute pression interne du tube (5) et refoulement axial simultané du tube (5).

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