One-piece hollow camshaft and process for producing it

F - Mech Eng,Light,Heat,Weapons – 16 – H

Patent

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Details

F16H 53/02 (2006.01) B21D 53/84 (2006.01) F01L 1/047 (2006.01) F01L 1/053 (2006.01)

Patent

CA 2177355

The invention relates to a hollow camshaft consisting of a metal or metal alloy or plastic which can be cold-formed and heat- treated and has a fiber flow parallel to the exterior contours of the camshaft, and to a method for producing it comprising the steps of: - Placing a pipe outlet element and filling it with fluid; - Sealing at least the pipe section to be widened; - Applying an internal high pressure suitable for widening the pipe section to produce an intermediate product pre- form, wherein, while the internal high pressure is applied, the hollow pipe is compressed against a movable die in the direction of its long axis in such a way that accumulations of material occur at approximately those places where it is intended to create cams; - Shaping the intermediate product pre-form into a shape corresponding to a final camshaft shape by means of the internal high pressure shaping method, so that cams are shaped at the desired locations; - If necessary, finishing the cams by heat-treatment or the like.

L'invention concerne un arbre à cames creux fabriqué en un métal ou alliage métallique à traitement thermique, façonnable à froid, ou en matière plastique, à fibrage parallèle aux profils extérieurs de l'arbre à cames, ainsi qu'un procédé pour sa fabrication, caractérisé en ce qu'on part d'une ébauche tubulaire que l'on remplit d'un fluide, on rend étanche au moins un tronçon du tube à élargir, on applique une pression élevée à l'intérieur, afin d'élargir le tronçon de tube pour préparer une préforme d'un produit intermédiaire, le tube creux étant refoulé à l'encontre d'un moule mobile, en direction de son axe longitudinal, pendant l'application de la pression élevée interne, de telle façon que l'accumulation de matière se produise approximativement aux emplacements où les cames doivent être formées, on transforme la préforme du produit intermédiaire en une forme correspondant à la forme définitive de l'arbre à cames, par façonnage sous haute pression interne, de telle façon que les cames soient mises en forme aux emplacements voulus et, éventuellement, on parachève les cames, par traitement thermique ou analogue.

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