Cooling apparatus of die casting mold

Abstract

A cooling apparatus provided in a casting mold part formed with a cooler insertion hole in a die casting mold may include a cooler head including a coolant supply connector and a coolant exhaust connector, an internal pipe fixed to the cooler head to be fluidically-connected to the coolant supply connector, and integrally formed with a spiral protrusion over a predetermined range from a front end portion toward a rear end portion, and an external pipe fixed to the cooler head to be fluidically-connected to the coolant exhaust connector while holding a portion of a remaining range of the internal pipe, and configured to be coupled with an internal circumferential surface of the cooler insertion hole.

What is claimed is: 
     
         1 . A cooling apparatus provided in a casting mold part formed with a cooler insertion hole in a die casting mold, the cooling apparatus comprising:
 a cooler head including a coolant supply connector and a coolant exhaust connector;   a first pipe fixed to the cooler head to be fluidically-connected to the coolant supply connector, and integrally formed with a spiral protrusion over a predetermined range of the first pipe; and   a second pipe fixed to the cooler head to be fluidically-connected to the coolant exhaust connector while holding a portion of a remaining range of the first pipe, and configured to be coupled with an internal circumferential surface of the cooler insertion hole.   
     
     
         2 . The cooling apparatus of  claim 1 , wherein the first pipe is an internal pipe and the second pipe is an external pipe aligned to surround the internal pipe in a predetermined length of the internal pipe. 
     
     
         3 . The cooling apparatus of  claim 2 , wherein the cooler head includes:
 a coolant supply passage fluidically connected to the coolant supply connector, and fluidically connected to a hollow of the internal pipe; and   a coolant exhaust passage fluidically connected to the coolant exhaust connector, and fluidically connected to a hollow of the external pipe.   
     
     
         4 . The cooling apparatus of  claim 3 , wherein the coolant exhaust passage is fluidically connected to a coolant flow passage formed between an external circumferential surface of the internal pipe and an internal circumferential surface of the external pipe. 
     
     
         5 . The cooling apparatus of  claim 2 ,
 wherein the predetermined range of the internal pipe includes a predetermined first range, and   wherein the internal pipe is formed with the spiral protrusion on an external circumferential surface of the internal pipe over the predetermined first range from a front end portion of the internal pipe toward a rear end portion of the internal pipe, and is coupled with the cooler head through the rear end portion of the internal pipe.   
     
     
         6 . The cooling apparatus of  claim 5 ,
 wherein the remaining range of the internal pipe includes a predetermined second range having the predetermined length,   wherein the predetermined second range is positioned along the hollow of the external pipe from the rear end portion of the internal pipe toward the front end portion of the internal pipe, and   wherein a predetermined third range of the internal pipe between the predetermined first range and the predetermined second range is configured to be positioned inside the cooler insertion hole, together with the predetermined first range of the internal pipe.   
     
     
         7 . The cooling apparatus of  claim 6 ,
 wherein the predetermined second range is between the rear end portion of the internal pipe and a front end portion of the external pipe.   
     
     
         8 . The cooling apparatus of  claim 6 ,
 wherein the predetermined second range and the predetermined third range are integrally formed; and   wherein the predetermined first range and the predetermined third range are interconnected through a laser welding portion.   
     
     
         9 . The cooling apparatus of  claim 6 ,
 wherein the external pipe is configured to be screw-engaged with the internal circumferential surface of the cooler insertion hole through a thread formed on an external circumferential surface of the external pipe on the predetermined second range, and is coupled with the cooler head through a rear end portion of the external pipe.   
     
     
         10 . The cooling apparatus of  claim 1 ,
 wherein the external pipe is configured to be screw-engaged with the internal circumferential surface of the cooler insertion hole through a thread formed on an external circumferential surface of a front end portion of the external pipe, and is coupled with the cooler head through a rear end portion of the external pipe.   
     
     
         11 . The cooling apparatus of  claim 2 , wherein a hollow of the internal pipe is formed by drilling by a super drill. 
     
     
         12 . The cooling apparatus of  claim 2 , wherein a thickness of the internal pipe is greater than or equal to 0.3 mm. 
     
     
         13 . The cooling apparatus of  claim 1 ,
 wherein an internal diameter of the internal pipe satisfies an equation of   
       
         
           
             
               
                 x 
                 ≤ 
                 
                   
                     
                       D 
                       × 
                       
                         ( 
                         
                           
                             C 
                             2 
                           
                           - 
                           
                             B 
                             2 
                           
                         
                         ) 
                       
                     
                   
                   5 
                 
               
               , 
             
           
         
         where A is an internal diameter of the internal pipe, B is an external diameter of the internal pipe, C is an external diameter of the spiral protrusion, and D is a pitch of the spiral protrusion.