Aluminum alloy for casting-forge, and aluminum casting forged product and manufacturing method therefor

Abstract

An aluminum casting forged product is provided by using an aluminum alloy for casting forge including a useless raw material for forging such as flash as a raw material and by controlling a weight percentage of an alloy element such as silicon, magnesium, copper, and manganese; the product having an enhanced fluidity, and an improved castability, with retaining a sufficient strength, preventing useless intermetallic compounds from forming, restraining deterioration due to oxidation and corrosion, and further improved strength by a forging effect: and there is also provided a simple manufacturing method, with a high yield and high productivity. An aluminum casting forged product of high tensile strength, high proof, and elongation, higher mechanical properties than those of the conventional casting forged product, high corrosion resistance, and high quality without defects, and being low in cost is also obtainable as a thick-wall aluminum product.

What is claimed is:  
     
         1 . An aluminum alloy for casting forge which is cast into a raw material for forging, 
 characterized in that it contains 0.2 to 2.0 wt % of silicon, 0.35 to 1.2 wt % of magnesium, 0.1 to 0.4 wt % of copper, and 0.01 to 0.08 wt % of manganese.    
     
     
         2 . An aluminum casting forged product which is manufactured by forging after being cast, 
 characterized in that it contains 0.2 to 2.0 wt % of silicon, 0.35 to 1.2 wt % of magnesium, 0.1 to 0.4 wt % of copper, and 0.01 to 0.08 wt % of manganese.    
     
     
         3 . A preformed product which is cast by using an aluminum alloy for casting forge according to  claim 1 , and of which compression ratio is 18 to 60% when a shape of a final product is taken as 100%.  
     
     
         4 . A vehicular suspension part manufactured by using an aluminum alloy for casting forge according to  claim 1 .  
     
     
         5 . The preformed product according to  claim 3 , wherein said final product is a vehicular suspension part.  
     
     
         6 . A manufacturing method for an aluminum casting forged product containing 0.2 to 2.0 wt % silicon, 0.35 to 1.2 wt % magnesium, 0.1 to 0.4 wt % copper, and 0.01 to 0.08 wt % manganese, 
 characterized by comprising    a molten metal step of obtaining molten metal by melting a material for forging at a temperature of about 680 to 780° C.;    a casting step of obtaining a raw material for forging by casting said molten metal at a mold temperature of about 60 to 150° C.;    a rough forging step of obtaining a rough forging by heating said raw material for forging to a surface temperature of about 380 to 520° C. and forging said raw material;    a finish forging step of obtaining a finished forging by heating said rough forging to a surface temperature of about 380 to 520° C. and forging said rough forging; and    a clipping flash step of obtaining a finial product by removing flash from said finished forging.    
     
     
         7 . The manufacturing method for an aluminum casting forged product according to  claim 6 , wherein said raw material for forging includes useless flash produced at the time of forging as a raw material.  
     
     
         8 . The manufacturing method for an aluminum casting forged product according to  claim 6 , wherein a compression ratio of a shape of said raw material for forging is 18 to 60% when a shape of a final product is taken as 100%.  
     
     
         9 . A vehicular suspension part manufactured by a manufacturing method for an aluminum casting forged product according to claim  6 .