Method of manufacturing Al-Mg-Si alloy sheet capable of forming a flat hemming

Abstract

A method of manufacturing a rolling sheet of AA6000 aluminum alloy comprising Si and Mg as major components is disclosed. More specifically, the present invention provides a method of manufacturing a rolling sheet of an aluminum alloy sheet capable of forming a flat hemming wherein its fractional volume for cube orientation is 35 or higher.

1 . A method of manufacturing Al—Mg—Si alloy sheets capable of forming a flat hemming comprising hot-rolling an Al—Mg—Si alloy sheet at a temperature range of about 300° C. to about 350° C.  
     
     
         2 . The method of  claim 1 , wherein said method further comprises a cold-rolling and T4 heat-treating step following said hot-rolling process.  
     
     
         3 . The method of  claim 2 , wherein said cold-rolling is performed until said alloy sheet develops a thickness of 1 mm.  
     
     
         4 . The method of  claim 2 , wherein said heat-treating comprises a T4 heat-treatment.  
     
     
         5 . A method of manufacturing alloy sheets capable of forming a flat hemming, comprising: 
 preventing a development of a rotated cube orientation during manufacturing of an alloy sheet;    cold-rolling said alloy sheet; and    heat-treating said alloy sheet.    
     
     
         6 . The method of  claim 5 , wherein said alloy sheet comprises an Al—Mg—Si alloy sheet.  
     
     
         7 . The method of  claim 5 , where said preventing comprises reducing friction between said alloy sheet and a roller used during a hot-rolling step, wherein said hot-rolling step is performed at a temperature range of about 300 to 350° C.  
     
     
         8 . The method of  claim 7 , wherein said hot-rolling step is performed until said alloy sheet develops a thickness of 5 mm.  
     
     
         9 . The method of  claim 7 , wherein said hot-rolling step further comprises a coiling temperature of 300° C.  
     
     
         10 . The method of  claim 5 , wherein said cold-rolling is performed until said alloy sheet develops a thickness of 1 mm.  
     
     
         11 . The method of  claim 5  wherein said heat-treating comprises a T4 heat-treatment.  
     
     
         12 . The method of  claim 1   1 , wherein said T4 heat-treatment further comprises a solution treatment and a quenching process.  
     
     
         13 . A method of manufacturing alloy sheets capable of forming a flat hemming, comprising: 
 hot-rolling said sheet at a temperature range of about 300° C. to about 350° C.;    cold-rolling said sheet; and    heat treating said sheet.    
     
     
         14 . The method of  claim 13 , wherein said alloy sheet comprises an Al—Mg—Si sheet.