Hot drape forming by means of a stiffness controlled vacuum bag

Details Hot drape forming by means of a stiffness controlled vacuum bag Hot drape forming by means of a stiffness controlled vacuum bag

B - Operations, Transporting

29

C

B29C 70/44 (2006.01) B29C 43/12 (2006.01) B29C 51/10 (2006.01) B29C 51/36 (2006.01)

Patent

CA 2741171

The invention relates to an apparatus and a method of conforming a blank (15) onto forming surface sections (5) of a forming tool (7) by drawing a first vacuum against an elastic forming medium (1) for transmitting forming forces from the elastic forming medium (1) to the blank (15), the method includes the steps of evacuating the elastic forming medium (1) with the first vacuum for allowing the elastic forming medium (1) to stretch and conform the blank (15) to the forming surface sections (5). The elastic forming medium (1) comprises at least one void (3), and a step of applying a second vacuum to the void (3) is performed for achieving a stiffened section (4) of the elastic forming medium (1) corresponding with the location of the void (3) and corre-sponding with, when the elastic forming medium (1) after the completion lies against the forming tool (7) having the blank (15) in between, a forming surface section (5) of the forming tool (7) where the blank (15) requires a forming force (F) being larger than that of surrounding sections (17) of the elastic forming medium (1).

L'invention concerne un appareil et un procédé de conformation d'une ébauche (15) sur des sections de surface de formage (5) d'un outil de formage (7) par tirage sous un premier vide contre un moyen de formage élastique (1) pour transmettre des forces de formage du moyen de formage élastique (1) à l'ébauche (15). Le procédé comprend les étapes de mise sous un premier vide du moyen de formage élastique (1) pour permettre au moyen de formage élastique (1) d'étirer et de conformer l'ébauche (15) aux sections de surface de formage (5). Le moyen de formage élastique (1) comprend au moins une cavité (3) et une étape d'application d'un second vide à la cavité (3) est effectuée pour obtenir une section rigidifiée (4) du moyen de formage élastique (1) correspondant à l'emplacement de la cavité (3) et correspondant avec, lorsque le moyen de formage élastique (1) après l'achèvement se trouve contre l'outil de formage (7) ayant l'ébauche (15) entre ceux-ci, une section de surface de formage (5) de l'outil de formage (7) où l'ébauche (15) nécessite une force de formage (F) qui est supérieure à celle de sections environnantes (17) du moyen de formage élastique (1).

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