Structural element for aircraft engineering exhibiting a...

C - Chemistry – Metallurgy – 22 – F

Patent

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Details

C22F 1/053 (2006.01) C22F 1/04 (2006.01) F27B 17/00 (2006.01) F27D 19/00 (2006.01)

Patent

CA 2560672

The invention relates to a method for producing a part made of aluminium alloy with structural hardening consisting a) in melting a semifinished extruded or forged rolled stock followed by water quenching, b) in optionally carrying out a controlled drawing with a permanent stretching which is equal to or greater than 5 % and c) in tempering. Said invention is characterised in that at least one tempering operation is carried out in a controlled thermal gradient linear furnace comprising at least two areas or groups of areas (Z1, Z2) at initial temperatures (T1, T2) in which the variation of each temperature T1, T2) around a specified temperature is equal or less than 5 °C through the length of said areas or the groups of areas, the difference between the specified temperatures of the initial temperatures T1 and T2 is equal or greater than 5 °C and said areas or the groups of areas are dividable by a transition area or group of areas (Z1,2) inside of which the initial temperature varies from T1 to T2 and a length which is parallel to the axis of the linear furnace of each at least two areas or the groups of areas Z1 and Z2 is equal to or greater than 1 meter.

L'invention concerne un procédé de fabrication d'une pièce en alliage d'aluminium à durcissement structural, comprenant a) la mise en solution d'un demi-produit laminé, filé ou forgé, suivie d'une trempe, b) éventuellement la traction contrôlée avec un allongement permanent d'au moins 0,5%, c) le traitement de revenu, caractérisé en ce qu'au moins une étape dudit traitement de revenu est effectuée dans un four linéaire à gradient thermique contrôlé comportant au moins deux zones ou groupes de zones Z1, Z2 avec des températures initiales T1, T2, dans lesquelles la variation de la température autour de la température de consigne de chacune des températures T1 et T2 ne dépasse pas ~ 5~C sur la longueur desdites zones ou groupes de zones, la différence entre les températures de consigne des températures initiales T1 et T2 étant supérieure ou 15 égale à 5 ~C , et lesdites zones ou groupes de zones pouvant être séparées par une zone ou groupe de zones Z1,2 dit de transition à l'intérieur de laquelle ou duquel la température initiale varie de T1 à T2, et caractérisé en ce que la longueur parallèle à l'axe du four linéaire de chacune desdites au moins deux zones ou groupes de zones Z1 et Z2 est d'au moins un mètre.

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