Method of roll-forming high-strength aluminum alloy and roll-formed product using the same

Abstract

A method of roll-forming a high-strength aluminum alloy, may include processing an aluminum alloy plate to form a square bar, pressing the plate so that deformation begins in a cross section thereof; and forming the square bar having at least one bent portion by completion of the deformation, wherein the method further includes partially performing a heat treatment on the bent portion before forming the square bar.

What is claimed is: 
     
         1 . A method of roll-forming an aluminum alloy by processing an aluminum alloy plate to form a square bar, the method comprising:
 pressing the plate so that deformation begins in a cross section thereof; and   forming the square bar having at least one bent portion by completion of the deformation, and   partially performing a heat treatment on the bent portion before forming the square bar.   
     
     
         2 . The method of  claim 1 , wherein the heat treatment is performed by heating the bent portion at a temperature of 350 to 400° C. 
     
     
         3 . The method of  claim 2 , wherein the heat treatment is performed by irradiating the bent portion with a laser for a predetermined time period. 
     
     
         4 . The method of  claim 1 , wherein the aluminum alloy is a 7XXX series aluminum alloy. 
     
     
         5 . A roll-formed product of an aluminum alloy, the roll-formed product including the aluminum alloy and having a bent portion formed thereon, wherein the roll-formed product is formed by partially performing a heat treatment on the bent portion to remove residual stress which is partially generated in the bent portion during the forming. 
     
     
         6 . The roll-formed product of  claim 5 , wherein the heat treatment is performed by heating the bent portion at a temperature of 350 to 400° C. 
     
     
         7 . The roll-formed product of  claim 6 , wherein the heat treatment is performed by irradiating the bent portion with a laser for a predetermined time period. 
     
     
         8 . The roll-formed product of  claim 5 , wherein the aluminum alloy is a 7XXX series aluminum alloy. 
     
     
         9 . The roll-formed product of  claim 5 , wherein the product is configured such that in a microstructure having a ratio of an angle boundary with a tilt angle equal to or greater than 2° and less than 15° is equal to or less than 21%. 
     
     
         10 . The roll-formed product of  claim 5 , wherein the product is a bumper beam for a vehicle.