A method for improving the hemmability of age-hardenable...

Details A method for improving the hemmability of age-hardenable... A method for improving the hemmability of age-hardenable...

C - Chemistry, Metallurgy

22

F

C22F 1/04 (2006.01) B21D 5/16 (2006.01) B21D 39/02 (2006.01) C22F 1/047 (2006.01) C22F 1/053 (2006.01) C22F 1/057 (2006.01)

Patent

CA 2288271

An improved method of forming a severe bend (20) or a hem in a sheet (10) of wrought aluminum age-hardened and age-hardenable alloy includes heating the region (22) to be bent or hemmed to a temperature above about 250°C for a period of seconds and then quenching the heated region to remove the age-hardening effect and thereafter accomplishing the bend (20) or hem before age hardening of the heated region occurs.

L'invention concerne un procédé perfectionné permettant de former un repli marqué (20) ou un bord rabattu sur une feuille (10) d'aluminium corroyé durci par vieillissement et d'un alliage durcissable par vieillissement, lequel procédé consiste à chauffer la zone (22) à plier ou à rabattre à une température dépassant 250 DEG C environ durant quelques secondes, puis à tremper la zone chauffée de manière à éliminer l'effet de durcissement par vieillissement, et enfin à procéder à la formation du repli (20) ou du bord rabattu avant que la région chauffée ne durcisse par vieillissement.

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