Die casting component and method for the production thereof

Abstract

The mechanical properties of a die casting component made of an aluminium alloy have the following proportions; magnesium 3.0-6.0 wt %, silicon 1.4-3.5 wt % manganese 0.5-2.0 wt %, iron max. 0.15 wt %, titanium max. 0.2 wt %, the remainder being aluminium and other components having a total proportion of a maximum of 0.2 wt %. Said mechanical properties improve significantly by virtue of the fact that the die casting component is subjected to heat treatment in the form of thermal hardening at a temperature T of 180° C.=T=320° C. over a period of at least thirty minutes after die casting.

1 . A process for producing a pressure die-cast component from an aluminum alloy comprising the following constituents, in percent by weight  
     
       
         
               
               
               
             
                   
                   
               
                   
                   
               
                   
                 Magnesium 
                 3.0-6.0 
               
                   
                 Silicon 
                 1.4-3.5 
               
                   
                 Manganese 
                 0.5-2.0 
               
                   
                 Iron 
                 Max. 0.15 
               
                   
                 Titanium 
                 Max. 0.2 
               
                   
                 Remainder aluminum and other components 
                 max. 0.2 
               
                   
                 amounting to a total content of 
               
                   
                   
               
                   
                   
               
           
              
              
             
             
              
              
              
              
              
              
              
              
              
             
          
         
       
     
     characterized in that the pressure die-cast component, after the die-casting operation, is subjected to a heat treatment in the form of hot age-hardening at a temperature T of 180° C.≦T≦320° C. for a period of at least half an hour.  
   
   
       2 . The process as claimed in  claim 1 , characterized in that the magnesium contect is selected to be between 5.0 and 6.0% by weight.  
   
   
       3 . The process as claimed in  claim 1 , characterized in that the silicon content is selected to be between 1.5 and 3.0% by weight.  
   
   
       4 . The process as claimed in  claim 1 , characterized in that the maximum copper content is selected to be 0.05% by weight and the maximum zinc content is selected to be 0.10% by weight.  
   
   
       5 . The process as claimed in  claim 1 , characterized in that the hot-age-hardening is carried out at a temperature T of between 220 and 280° C., preferably at approximately 250° C.  
   
   
       6 . The process as claimed in  claim 1 , characterized in that the hot age-hardening is carried out for a period of between half an hour and three hours.  
   
   
       7 . The process as claimed in  claim 1 , characterized in that the pressure die-cast component, after the die-casting operation, is welded to wrought material and then subjected to the hot age-hardening.  
   
   
       8 . A pressure die-cast component made from an aluminum alloy comprising the following constituents, in percent by weight  
     
       
         
               
               
               
             
                   
                   
               
                   
                   
               
                   
                 Magnesium 
                 3.0-6.0 
               
                   
                 Silicon 
                 1.4-3.5 
               
                   
                 Manganese 
                 0.5-2.0 
               
                   
                 Iron 
                 Max. 0.15 
               
                   
                 Titanium 
                 Max. 0.2 
               
                   
                 Remainder aluminum and other components 
                 max. 0.2 
               
                   
                 amounting to a total content of 
               
                   
                   
               
                   
                   
               
           
              
              
             
             
              
              
              
              
              
              
              
              
              
             
          
         
       
     
     producible by the process as claimed in  claim 1 , characterized by a tensile strength (Rm) of >300 Mpa, a proof stress (Rp 0.2 ) of ≧180 Mpa and an elongation at break of >8%.  
   
   
       9 . The pressure die-cast component as claimed in  claim 8 , characterized by a proof stress of ≧200 Mpa with an elongation at break of between 8% and 10%.  
   
   
       10 . The pressure die-cast component as claimed in  claim 8 , characterized by a proof stress of ≧180 Mpa with an elongation at break of between 10% and 12%.  
   
   
       11 . The pressure die-cast component as claimed in  claim 8 , characterized by a magnesium content of between 5.0 and 6.0% by weight.  
   
   
       12 . The pressure die-cast component as claimed in  claim 8 , characterized by silicon content of between 2.0 and 2.5% by weight.  
   
   
       13 . The pressure die-cast component as claimed in  claim 8 , characterized by a maximum copper content of 0.05% by weight and a maximum zinc content of 0.10% by weight.  
   
   
       14 . The pressure die-cast component as claimed in  claim 8 , characterized in that it is constructed welded to a wrought material, which is consolidated together with the aluminum alloy by hot age-hardening.