Die-casting mold

Abstract

A die-casting mold includes a first mold insert located on a side of a fixed die, and a second mold insert located on a side of a movable die. The first mold insert includes first through-holes filled with a melted metal material to be used to mold heat sink pins. The second mold insert includes second through-holes usable to discharge gas in a molding space. At least one of a first facing surface and a second facing surface includes recessed grooves communicated with the first and second through-holes when the first and second mold inserts are located in place, and the recessed grooves prevent the melted metal material from passing therethrough but allow the gas to pass therethrough. As seen in a die moving direction, the first through-holes do not overlap at least a portion of the second through-holes.

What is claimed is: 
     
         1 . A die-casting mold to mold a molded item including a plurality of heat sink pins, the die-casting mold comprising:
 a fixed die;   a movable die movable toward, or away from, the fixed die;   a mold insert to mold the plurality of heat sink pins; and   a molding space defined by the fixed die, the movable die and the mold insert, the molding space configured to be filled with a melted metal material; wherein   where a direction in which the movable die is movable with respect to the fixed die is a die moving direction;   the mold insert includes:
 a first mold insert located on a side of the fixed die in the die moving direction; and 
 a second mold insert located on a side of the movable die in the die moving direction; and 
   the first mold insert includes:
 a first body including a first facing surface facing the second mold insert; and 
 a plurality of first through-holes extending in the die moving direction and extending through the first body, the plurality of first through-holes being filled with the melted metal material to be respectively used to mold the plurality of heat sink pins; 
   
       the second mold insert includes:
 a second body including a second facing surface facing the first facing surface; and 
 a plurality of second through-holes extending in the die moving direction and extending through the second body, the plurality of second through-holes being usable to discharge gas in the molding space; 
 at least one of the first facing surface and the second facing surface includes recessed grooves communicated with the first through-holes and the second through-holes when the first mold insert and the second mold insert are located in place, and the recessed grooves prevent the melted metal material from passing therethrough but allow the gas to pass therethrough; and 
 as seen in the die moving direction, the plurality of first through-holes do not overlap at least a portion of the plurality of second through-holes. 
 
     
     
         2 . The die-casting mold according to  claim 1 , wherein as seen in the die moving direction, the plurality of first through-holes do not overlap the plurality of second through-holes. 
     
     
         3 . The die-casting mold according to  claim 1 , wherein in one of the recessed grooves, a number of the second through-holes communicated with the recessed groove is smaller than a number of the first through-holes communicated with the recessed groove. 
     
     
         4 . The die-casting mold according to  claim 1 , wherein the recessed grooves are provided in the second facing surface. 
     
     
         5 . The die-casting mold according to  claim 1 , wherein the second body includes:
 a rear surface located opposite to the second facing surface in the die moving direction;   insertion holes recessed toward the second facing surface from the rear surface, and configured to allow pipes, in which cooling water flows, to be inserted thereto; and   connection grooves in the rear surface and connecting the second through-holes and the insertion holes to each other.   
     
     
         6 . The die-casting mold according to  claim 5 , wherein one of the insertion holes is connected with a plurality of the second through-holes via at least one of the connection grooves. 
     
     
         7 . The die-casting mold according to  claim 6 , wherein the insertion holes each have an inner diameter greater than an inner diameter of each of the second through-holes.