Method of manufacturing hollow product using draft angle

Abstract

A method of manufacturing a hollow product using a draft angle is disclosed. A method of manufacturing a hollow product using a draft angle refers to a method of manufacturing a hollow product using a core having a draft angle. The core is formed to protrude in one direction and has an outer surface at a perimeter of a protruding portion of the core, the outer surface of the core forms a slope with respect to the one direction, and a cross-sectional area of the core decreases as the core goes toward a protruding direction. The method comprises disposing a mold to be spaced apart from the outer surface of the core, disposing a hollow tube between the core and the mold, injecting a molten metal into a space between the core and the mold, and removing the core when the molten metal is solidified and the hollow product is molded.

1 . A method of manufacturing a hollow product using a core having a draft angle, wherein the core is formed to protrude in one direction and has an outer surface at a perimeter of a protruding portion of the core, the outer surface of the core forms a slope with respect to the one direction, and a cross-sectional area of the core decreases as the core goes toward a protruding direction, the method comprising:
 disposing a mold to be spaced apart from the outer surface of the core;   disposing a hollow tube between the core and the mold;   injecting a molten metal into a space between the core and the mold; and   removing the core when the molten metal is solidified and the hollow product is molded.   
     
     
         2 . The method of  claim 1 , wherein a carrier is installed at a perimeter of the outer surface of the core,
 wherein an inner surface of the carrier is in close contact with the outer surface of the core,   wherein an outer surface of the carrier is formed parallel to the one direction,   wherein in the disposing of the mold, the mold is disposed to be spaced apart from the outer surface of the carrier   wherein in the disposing of the hollow tube, the hollow tube is disposed between the carrier and the mold, and   wherein in the injecting of the molten metal, the molten metal is injected between the carrier and the mold.   
     
     
         3 . The method of  claim 2 , wherein the carrier is formed such that a hollow is formed inside a cylindrical extruded material, and an inner surface of the hollow is processed to be tapered. 
     
     
         4 . The method of  claim 2 , wherein that carrier is formed such that a plate, in which a slope of one surface is the same as a slope of the outer surface of the core and a slope of other surface is formed parallel to the one direction, is in close contact with the outer surface of the core. 
     
     
         5 . The method of  claim 5 , wherein a material of the carrier is a metal or a non-ferrous metal. 
     
     
         6 . The method of  claim 1 , wherein a clip is installed at a perimeter of the outer surface of the core,
 wherein an inner surface of the clip is in close contact with the outer surface of the core,   wherein an outer surface of the clip is formed parallel to the one direction, and   wherein the hollow tube is fixed to the outer surface of the clip.   
     
     
         7 . The method of  claim 6 , wherein a material of the clip is a metal or a non-ferrous metal. 
     
     
         8 . The method of  claim 5 , wherein the clip is formed only on a portion of the perimeter of the outer surface of the core.