Vacuum bag for hot drape forming

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 39/42 (2006.01)

Patent

CA 2722937

The present invention regards a method and an apparatus for conforming a blank (35) onto forming surface sections (3) of a forming tool (5) by drawing vacuum against an elastic vacuum bag (1) for transmitting forming forces from the elastic vacuum bag (1) to the blank (35), the elastic vacuum bag (1) comprises at least one bag section having a different stiffness than other bag sections. The at least one bag section is an elongated bag section (13,13) having a stiffness larger than that of surrounding bag sections (15), the location of the elongated bag section (13,13) of the elastic vacuum bag (1) corresponds, when the elastic vacuum bag (1) after said completion lies against the forming surface sections (3) having the blank (35) in between, with an elongated forming surface section (10) of the forming tool (5) where the blank (35) requires a forming force (F) being larger than that of the surrounding bag sections (15).

La présente invention concerne un procédé et un appareil permettant de conformer une découpe (35) sur des sections de surface de formage (3) dun outil de formage (5) en formant un vide contre un sac sous vide élastique (1) pour transmettre des forces de formage du sac sous vide élastique (1) vers la découpe (35). Le sac sous vide élastique (35) comprend au moins une section de sac dont la rigidité est différente de celle des autres sections de sac. La ou les sections de sac sont une ou des sections de sac allongées (13, 13) présentant une rigidité supérieure à celle des sections de sac alentour (15). Lemplacement de la section de sac allongée (13, 13) du sac sous vide élastique (1) correspond, lorsque le sac sous vide élastique (1), après ladite réalisation, repose contre les sections de surface de formage (3) comprenant la découpe (35) entre elles, à une section de surface de formage allongée (10) de l'outil de formage (5) lorsque la découpe (35) requiert une force de formage (F) supérieure à celle des sections de sac alentour (15).

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