Core pin unit for die casting

Abstract

A core pin unit for die casting mounted inside a movable mold including a core die and a core holder for forming a hole at a mold is provided, which comprises a core pin body being inserted into both the core holder and the core die, a locking screw mounted at the rear end of the core pin body inserted into the core holder, a spring interposed between the core pin body and the locking screw in the core holder; and a cooler mounted at the rear end of the core pin body. The core pin unit prevents a core pin body from bending due to a load of a molten metal introduced and from being damaged by vibration thereof.

1 . A core pin unit for die casting, which is mounted inside a movable mold including a core die and a core holder for forming a hole at a mold, the core pin unit comprising:
 a core pin body being inserted into both the core holder and the core die such that a front end of the core pin body protrudes forwardly from the core die and a rear end thereof protrudes rearwardly from the core holder, a middle portion thereof including a circular supporter formed along an exterior circumference thereof;   a locking screw mounted at the rear end of the core pin body inserted into the core holder;   a spring interposed between the core pin body and the locking screw in the core holder; and   a cooler mounted at the rear end of the core pin body in such a state that it is inserted into the core pin body so as to cool the core pin body.   
   
   
       2 . The core pin unit for die casting of  claim 1 , wherein the core pin body is provided with a circulation passage formed along a length direction thereof so that the cooler is inserted therein, and a screw thread is formed at the rear end thereof. 
   
   
       3 . The core pin unit for die casting of  claim 1 , wherein the locking screw is provided with a penetrating hole into which the core pin body is inserted, and a screw thread is formed at an exterior circumference thereof so as to be connected to the core holder by screws. 
   
   
       4 . The core pin unit for die casting of  claim 3 , wherein an insert groove is formed at the rear end of the locking screw so that a tool is mounted at the core holder. 
   
   
       5 . The core pin unit for die casting of  claim 1 , wherein the cooler comprises:
 a mounting connector having a front portion threaded to a rear end of the core pin and an oil passage formed therein;   a coolant supply nipple integrally coupled to the rear end of the mounting connector, and communicated with the cooling pump so as to receive a coolant;   a coolant supply pipe integrally coupled to the coolant supply nipple, which penetrates the oil passage from the front of the mounting connector, and which is inserted into the core pin body so as to supply the core pin body with the coolant; and   a coolant exhaust nipple integrally coupled to the rear end of the mounting connector, and communicated with the oil passage so as to exhaust the coolant that is provided to the inside of the core pin body through the coolant supply pipe and that is subsequently used for cooling.