Superplastic forming process

Details Superplastic forming process Superplastic forming process

B - Operations, Transporting

21

D

B21D 26/02 (2006.01)

Patent

CA 2306555

A method is disclosed for stretching sheet blanks (60), especially superplastic sheets, by differential gas pressure into conformity with a female die surface (38, 40, 42, 44) without encountering excessive thinning or tearing of the sheet (60). The warned SPF sheet is draped over a preformed surface (50) to draw more of the sheet material into the die cavity (46) before the edges (62) of the sheet (60) are fixedly clamped whereby the additional formable material is used in forming the product, thereby reducing thinning and tears.

L'invention concerne un procédé d'étirage d'ébauches en feuille (60), notamment de feuilles superplastiques, à l'aide d'une pression de gaz différentielle, sur une surface de matrice femelle (38, 40, 42, 44), sans amincissement excessif ou déchirement de la feuille (60). La feuille de formage superplastique chauffée est drapée sur une surface préformée (50), de sorte que le matériau en feuille soit mieux étiré dans la cavité (46) de la matrice avant que les bords (62) de la feuille (60) soient immobilisés, le matériau supplémentaire pouvant être formé et utilisé dans le formage du produit, ce qui réduit l'amincissement et le déchirement.

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