Patent ID: 7210517

Claim:
A die casting machine for forming a product, comprising: a fixed die; a movable die movably positioned to face the fixed die and to cooperate with the fixed die to define a cavity in which the product is formed; an injection apparatus configured to inject molten metal into the cavity; a vacuum pump configured to reduce pressure in the cavity and in a path of the molten metal in communication with the cavity; an ejection mechanism configured to fix to the movable die, the ejection mechanism comprising at least one ejecting pin and a seal holding member, the ejection mechanism being configured to define a first coolant accommodating space, wherein the seal holding member defines a fitting hole in which the ejecting pin is moveably fitted, the fitting hole being in communication with an insert hole formed in the movable die to the cavity, has a first O ring arranged at an inner wall of the fitting hole in contact with the ejecting pin at a first side of the seal holding member adjacent to the insert hole of the movable die, has a second O ring at the inner wall of the fitting hole in contact with the ejecting pin at a second side of the seal holding member opposite to the first side, and defines a second coolant accommodating space communicating with the first coolant accommodating space, the ejecting pin penetrating the second coolant accommodating space, the second coolant accommodating space being positioned adjacent to the first and second O rings, and wherein the ejecting mechanism, defines a first path introducing coolant into the first coolant accommodating space and a second path discharging the coolant from the first coolant accommodating space, and includes an ejection pin movement mechanism configured to move the ejecting pin in the fitting hole and in the insert hole; a coolant supply configured to supply the coolant into the first coolant accommodating space through the first path; and a coolant discharge configured to remove the coolant from the first coolant accommodating space through the second path.