Aluminum cast -forged product and method for manufacturing aluminum cast-forged product

Abstract

This invention is directed to a method for manufacturing an aluminum cast-forged product by forging a preform made of a material for forging obtained by casting a material for forging of an aluminum alloy, and an aluminum cast-forged product produced thereby. Forming is performed by heating the preform made of a material for forging at a temperature of from approximately 450° C. to a melting point of the alloy. In this method, a recycled material may be used as a starting material, and some omission of the steps may be possible. There is provided a method for manufacturing an aluminum cast-forged product having excellent mechanical properties, such as, a higher tensile strength, higher proof stress, higher elongation, and the like with a lower production cost.

What is claimed is:  
     
         1 . A method for manufacturing an aluminum cast-forged product, which includes 
 a step of obtaining a preform made of forged material by casting a forged material of an aluminum alloy, and    a step of forging said preform made of forged material to obtain an aluminum cast-forged product,    wherein said step of forging includes a step of heating said preform made of forged material to a temperature of from approximately 450° C. to a melting point of said alloy.    
     
     
         2 . A method for manufacturing an aluminum cast-forged product, aid method comprising 
 a step of obtaining a preform made of a material for forging by casting a forged material of an aluminum alloy for forging, and directly thereafter    a step of forging that includes a plural steps of forging the preform made of a material for forging to obtain an aluminum cast-forged product,    wherein a first step of forging in said plural steps of forging is a step of forging the preform made of a material for forging by heating the preform made of a material for forging at a temperature of from approximately 450° C. to a melting point of the alloy    
     
     
         3 . The method for manufacturing an aluminum cast-forged product according to  claim 1 , 
 wherein said step of forging includes a step of rough forging and a step of finish forging, and    said step of rough forging is performed by heating said preform made of forged material at a temperature of from approximately 450° C. to a melting point of the alloy.    
     
     
         4 . The method for manufacturing an aluminum cast-forged product according to  claim 2 , 
 wherein said step of forging includes a step of rough forging and a step of finish forging, and    said step of rough forging is performed by heating said preform made of a material for forging at a temperature of from approximately 450° C. to a melting point of the alloy.    
     
     
         5 . The method for manufacturing an aluminum cast-forged product according to  claim 3 , 
 wherein said step of rough forging is performed by heating said preform made of forged material at a temperature higher than a temperature in said step of finish forging.    
     
     
         6 . The method for manufacturing an aluminum cast-forged product according to  claim 4 , 
 wherein said step of rough forging is performed by heating said preform made of a material for forging at a temperature higher than a temperature in said step of finish forging.    
     
     
         7 . The method for manufacturing an aluminum cast-forged product according to  claim 2 , wherein said aluminum alloy contains 0.2 to 2.5% by mass of silicon.  
     
     
         8 . The method for manufacturing an aluminum cast-forged product according to  claim 2 , wherein said a material for forging is cast using an aluminum alloy containing 0.4 to 0.8% by mass of silicon, 0.8 to 1.2% by mass of magnesium, 0.15 to 0.4% by mass of copper, and 0.04 to 0.35% by mass of chromium.  
     
     
         9 . The method for manufacturing an aluminum cast-forged product according to  claim 1 , wherein said melting point is approximately 652° C.  
     
     
         10 . The method for manufacturing an aluminum cast-forged product according to  claim 3 , wherein said melting point is approximately 652° C.  
     
     
         11 . A use of an aluminum cast-forged product manufactured by a method according to any one of  claims 1  to  10  as a vehicle suspension part.