Foldable mandrel for the production of a single curvature...

B - Operations – Transporting – 21 – D

Patent

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Details

B21D 47/00 (2006.01) B21D 13/04 (2006.01)

Patent

CA 2546706

The invention can be defined in its most general form as a device for sheet material corrugation by means of bending and can be applied in the devices for production of single curvature folded core used in production of aircraft and craft curvilinear panelsThe invention has for its object to broaden the technological capabilities. For that the mandrel is made in the form of a set of alternating rows of plane elements (4, 6, 7) made in the form of trapeziums (4) and isosceles triangles (6, 7) fixed on the flexible material of the base (5) forming thus the gap-pivots between the elements. At the same time the bases of the triangular elements (6, 7) face each other in pairs along the bending lines while said bending lines correspond to the protrusions lines of the core folded structure. The base of the triangular elementS (6, 7) is the function of the folded core block curvature radius and the geometrical parameters of the zigzag crimp structure.The width of the gap-pivots is taken so that to provide the folding of the mandrel together with the blank forming thus the single curvature zigzag corrugated structure with the lateral direction of crimps.

Dans sa forme la plus générale, l'objet de l'invention peut être défini comme un dispositif destiné à l'ondulation par pliage d'un matériau en feuille, et peut s'utiliser dans des dispositifs destinés à la production d'un noyau plié à courbe unique, utilisé dans la fabrication de panneaux curvilignes pour véhicules ou aéronefs. L'invention vise à élargir les capacités technologiques. A cette fin, le mandrin est constitué d'un ensemble de rangées alternantes d'éléments plans (4, 6, 7) ayant la forme de trapèzes (4) ou de triangles isocèles (6, 7) fixés sur le matériau souple de la base (5) de manière à former des intervalles charnières entre les éléments. En même temps, les bases des éléments triangulaires (6, 7) se font face en paires le long des lignes de courbure, ces lignes correspondant aux lignes de saillie de la structure de noyau plié. La base des éléments triangulaires (6, 7) est fonction du rayon de courbure du bloc de noyau plié et des paramètres géométriques de la structure à sertissures en zigzag. La largeur des intervalles charnières est choisie pour permettre le pliage du mandrin avec l'ébauche, de manière à permettre la formation de la structure ondulée à courbe unique en zigzag, avec une direction latérale des sertissures.

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