Die cast casting apparatus and method for releasing casting from mold

A die casting apparatus including a fixed die and a movable die to form a cavity for molding a casting, in which an insert core is slidably provided in a movable main die of the movable die to form a protruding portion of the casting,

• the movable die includes:
• product ejecting means to release the casting from the movable main die;
• core moving means to move the core formed of a plurality of separate blocks so that each of the separate blocks of the core is moved in the demolding direction of the casting to release the protruding portion from the insert die;
• and protruding-portion demolding means to push the casting at a portion near the protruding portion in the demolding direction, and
• wherein control means to control operations of the product ejecting means, the core moving means, and the protruding-portion demolding means is configured to execute a first demolding step in which the product ejecting means releases the casting from the movable main die and the core moving means moves the core in association with the casting, and a second demolding step in which the separate blocks are stepwise moved relatively in an opposite direction to the demolding direction by the core moving means with respect to the protruding portion of the casting pushed or supported by the protruding-portion demolding means to release the protruding portion from the core.

A method for releasing a casting from a die, using a die casting apparatus to form the casting including a protruding portion, the method including separating a movable die from a fixed die for die opening and then demolding the casting from the movable die, wherein the method includes:

• a first demolding step including moving an insert core configured to form the protruding portion in association with the casting to release a portion of the casting other than the protruding portion from a movable main die of the movable die;
• and a second demolding step including releasing the protruding portion from the core,
• wherein when the core is configured to form the protruding portion consisting of a plurality of straight extending standing plates arranged side by side,
• the second demolding step uses protruding-portion demolding means placed on both sides of the core corresponding to both side positions of the standing plates in a straight extending direction and includes alternately operating each side of the protruding-portion demolding means to push the casting in the demolding direction.