Powder metallurgy method

Abstract

Disclosed is a method of manufacturing a molded body. The method may include preparing a liquid or fluid lubricant by admixing an amount of about 50 to 80 parts by weight of ethylene bis stearamide, an amount of about 10 to 30 parts by weight of erucamide, and an amount of about 10 to 50 parts by weight of ester acid at a temperature of about 150 to 170° C., preparing a solid lubricant by cooling the liquid or fluid lubricant to a temperature of about 10 to 30° C., preparing a powder lubricant by pulverizing the solid lubricant to a particle size of about 10 to 75 μm, preparing a powder composition by mixing an amount of about 100 parts by weight of a metal powder and an amount of about 0.5 to 0.8 parts by weight of the powder lubricant, and manufacturing a molded body using the powder composition, wherein all the parts by weight are based on the 100 parts by weight of the metal powder.

What is claimed is: 
     
         1 . A method of manufacturing a molded body, comprising:
 preparing a liquid or fluid lubricant by admixing an amount of about 50 to 80 parts by weight of ethylene bis stearamide, an amount of about 10 to 30 parts by weight of erucamide, and an amount of about 10 to 50 parts by weight of ester acid;   preparing a solid lubricant by cooling the liquid or fluid lubricant;   preparing a powder lubricant by pulverizing the solid lubricant;   preparing a powder composition by mixing an amount of about 100 parts by weight of a metal powder and an amount of about 0.5 to 0.8 parts by weight of the powder lubricant; and   forming the molded body using the powder composition   wherein all the parts by weight based on the 100 parts by weight of the metal powder.   
     
     
         2 . The method of  claim 1 , wherein the ester acid comprises one or more selected from montan wax, glycerol monostearate, glycerol monooleate, and distearyl phthalate. 
     
     
         3 . The method of  claim 1 , wherein the liquid or fluid lubricant is prepared by mixing and agitating for about 10 to 30 minutes. 
     
     
         4 . The method of  claim 1 , wherein the liquid or fluid lubricant is prepared by mixing and agitating for at a temperature of about 150 to 170° C. 
     
     
         5 . The method of  claim 1 , wherein the liquid or fluid lubricant is cooled to a temperature of about 10 to 30° C. 
     
     
         6 . The method of  claim 1 , wherein the powder lubricant has a particle size of about 10 to 75 μm. 
     
     
         7 . The method of  claim 1 , wherein the molded body is formed by applying a pressure to the powder composition. 
     
     
         8 . The method of  claim 7 , wherein the pressure is of about 500 to 700 MPa. 
     
     
         9 . The method of  claim 1 , wherein the molded body is formed by applying an ejection force of about 800 to 1,100 kgf to thus eject the molded body from a mold. 
     
     
         10 . The method of  claim 1 , wherein the molded body has a density of about 7.2 to 7.3 g/cm 3 . 
     
     
         11 . A molded body manufactured by a method of  claim 1 . 
     
     
         12 . A vehicle comprising a molded body of  claim 11 .