Method for manufacturing a three dimensional frame structure...

B - Operations – Transporting – 21 – D

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B21D 47/00 (2006.01) B21F 27/10 (2006.01) E04C 2/34 (2006.01)

Patent

CA 2642240

The present invention relates to a method for manufacturing a three dimensional frame structure that can be used as a core structure in a sandwich construction. Furthermore, the invention relates to a frame structure for a sandwich construction, which frame structure has been manufactured in accordance with the method according to the invention. In the method, a two dimensional lattice structure (1) is made from bar-shaped linear semifinished products (2, 3), in which structure (1) the semifinished products (2, 3) intersect at defined points of intersection (4); the bar- shaped linear semifinished products (2, 3) are connected at the points of intersection (4) and are softened by locally applying heat to the lattice structure (1) in each case along three non-intersecting (imaginary) straight lines (5, 6). In order to impart a three dimensional shape to the lattice structure (1) a force (F) is introduced into the lattice structure (1) along the middle one of the (imaginary) straight lines (5, 6) to which heat has been applied, wherein, as a result of deformation of the lattice structure, the introduced force F is deflected into pairs of tensile forces acting in the semifinished products, as a result of which the lattice structure (1) is pulled into a third dimension, along the middle (imaginary) straight line (5, 6) to which heat has been applied.

La présente invention concerne un procédé de fabrication d'une structure de cadre tridimensionnelle qui peut être utilisée comme structure d'âme dans une construction de type sandwich. En outre, l'invention concerne une structure de cadre pour une construction de type sandwich, laquelle structure de cadre a été fabriquée conformément au procédé de l'invention. Dans ce procédé, une structure en treillis bidimensionnelle (1) est constituée de produits semi-finis linéaires en forme de barre (2, 3), dans laquelle structure (1) les produits semi-finis (2, 3) se croisent en des points définis d'intersection (4); les produits semi-finis linéaires en forme de barre (2, 3) sont reliés au niveau des points d'intersection (4) et sont ramollis par application locale de chaleur sur la structure en treillis (1) dans chaque cas le long de trois lignes droites (imaginaires) (5, 6) qui ne se croisent pas. Afin de donner une forme tridimensionnelle à la structure en treillis (1), une force (F) est appliquée à la structure en treillis (1) le long de la ligne médiane des lignes droites (imaginaires) (5, 6) sur laquelle de la chaleur a été appliquée. Du fait de la déformation de la structure en treillis, la force exercée (F) est fractionnée en paires de forces de traction qui agissent à l'intérieur des produits semi-finis, en conséquence desquelles la structure en treillis (1) est tirée dans une troisième dimension, le long de la ligne droite (imaginaire) médiane (5, 6) sur laquelle de la chaleur a été appliquée.

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