Mold degassing apparatus

A mold degassing apparatus comprising:

• a fixed mold;
• a movable mold;
• an exhaust passage formed on a mating surface between the fixed mold and the movable mold and communicating with a cavity of a mold;
• a pressure receiving pin provided on an inlet side of the exhaust passage in the fixed mold in such a way as to be slidable toward the exhaust passage and toward a side opposite to the exhaust passage, and configured to slide toward the side opposite to the exhaust passage due to a flow pressure of molten metal that flows into the exhaust passage;
• a closing valve provided on an outlet side of the exhaust passage in the fixed mold, and configured to close the exhaust passage via an interlocking lever due to sliding of the pressure receiving pin toward the side opposite to the exhaust passage;
• and
• an air supply device that supplies air at a time of opening the movable mold,
• wherein the pressure receiving pin includes:
• a fitting portion that fits in a hole portion provided in the fixed mold and communicating with a portion of the exhaust passage on the inlet side,
• a distal end portion that is located coaxially with the fitting portion at a position closer to the exhaust passage than the fitting portion, that slides with respect to the hole portion upon reception of the molten metal, and that has a columnar shape, and
• an intermediate portion that is located coaxially with the fitting portion and the distal end portion at a position between the fitting portion and the distal end portion and that has a diameter smaller than a diameter of the distal end portion, and
• wherein the air supply device is provided such that the supplied air passes through a gap formed between an outer peripheral surface of the intermediate portion and an inner peripheral surface of the hole portion and a gap formed between the distal end portion and the fixed mold and flows out to the movable mold.