Method for manufacturing forged product, and apparatus for manufacturing forged product

Abstract

This invention is directed to a method for manufacturing metal which includes a step of melting a forged material, and a step of casting a molten forged material to obtain a preform made of forged material, and a step of forging the preform made of forged material, and an apparatus therefor. The preform made of forged material comprises one or more of standardized preforms made of forged material having an approximately cylindrical form with the same cross sectional shape, but a different length. According to the present method and the present apparatus, one may produce metal products to which excellent mechanical properties are impaired by subjecting standardized preforms to the forging treatment with an improved productivity and reduced production cost.

What is claimed is:  
     
         1 . A method for manufacturing forged products having different sizes and shapes from a forged material, which includes: 
 a step of melting a forged material to obtain molten metal;    a step of casting said molten metal to obtain a preform made of forged material; and    a step of forging said preform made of forged material to obtain a forged product,    wherein said preform made of forged material comprises one, two or more forged products having a standard outer shape with same sectional shape and being substantially cylindrical.    
     
     
         2 . The method for manufacturing forged products having different sizes and shapes from a forged material according to  claim 1 , wherein the sectional shape of said preform made of forged material is substantially circular.  
     
     
         3 . The method for manufacturing forged products having different sizes and shapes from a forged material according to  claim 1 , wherein said method further includes a heat treatment step in which said forged material is subjected to heat treatment to obtain a metal product; said metal product being a vehicle suspension part.  
     
     
         4 . The method for manufacturing forged products having different sizes and shapes from a forged material according to  claim 2 , wherein said method further includes a heat treatment step in which said forged material is subjected to heat treatment to obtain a metal product; said metal product being a vehicle suspension part.  
     
     
         5 . The method for manufacturing forged products having different sizes and shapes from a forged material according to  claim 1 , wherein said forged material is an aluminum alloy.  
     
     
         6 . The method for manufacturing forged products having different sizes and shapes from a forged material according to  claim 2 , wherein said forged material is an aluminum alloy.  
     
     
         7 . The method for manufacturing forged products having different sizes and shapes from a forged material according to  claim 3 , wherein said forged material is an aluminum alloy.  
     
     
         8 . An apparatus for manufacturing a forged product for producing forged products having different sized and shapes from a forged material, comprising at least: 
 melting means for melting a forged material to obtain molten metal;    casting means for casting a molten metal to obtain a preform made of forged material; and    forging means for forging a preform made of forged material to obtain a forged product,    wherein said preform made of forged material comprises one, two or more forged products having a standard outer shape with same sectional shape and being substantially cylindrical.