Heat treatment method of aluminum alloy panel

Abstract

The present invention provides a heat treatment method of an aluminum alloy panel, which can prevent surface curvature of molded aluminum alloy panel. For this purpose, the present heat treatment methods comprise: cold rolling an aluminum alloy panel at a reduction ratio of 45 to 50% at a final pass in a cold rolling process; first heat-treating the cold-rolled aluminum alloy panel at 450 to 510° C. for 3 hours; rapidly cooling the heat-treated aluminum alloy panel at a rate 60° C./sec or higher after the first heat treatment; and second heat-treating the rapidly cooled aluminum alloy panel at 200 to 220° C.

1 . A heat treatment method of an aluminum alloy panel, the method comprising:
 cold rolling an aluminum alloy panel at a reduction ratio of 45 to 50% at a final pass in a cold rolling process;   first heat-treating the cold-rolled aluminum alloy panel at 450 to 510° C. for 3 hours;   rapidly cooling the heat-treated aluminum alloy panel at a rate of 60° C./sec or higher after the first heat treatment; and   second heat-treating the rapidly cooled aluminum alloy panel at 200 to 220° C.   
   
   
       2 . The method of  claim 1 , wherein the aluminum alloy panel is an AA5454 aluminum-magnesium alloy panel comprising 95.35-96.45 wt % aluminum (Al), 3.0 to 3.8 wt % of magnesium (Mg), 0.2 to 0.5 wt % of manganese (Mn), and 0.35 wt % of iron (Fe). 
   
   
       3 . The method of  claim 1 , wherein the aluminum alloy panel is cold-rolled at a reduction ratio of 45 to 50% such that shear stress is applied to the surface of the aluminum alloy panel and shear texture {001}110> is developed.