| 摘要 |
PURPOSE:To eliminate a gas entrapment to a casting by die casting, and to cast a sound product by installing a vent hole of an appropriate shape to a position separated by a prescribed interval from a separating surface of a metallic die. CONSTITUTION:In a metallic die for die casting, a vent hole 31 is installed to a final molten metal filling part in a cavity 3 or its vicinity, at a position separated from an inside end 2a of a metallic die separating surface 2, and opened in the cavity 3 as the vent hole 31 containing no separating surface 2. As for a size of the vent hole 31, a sectional area of >=3mm.<2> is required, and it is formed as an opening group of one or plural pieces. According to this metallic die structure, vent is executed easily, and a die casting of a high quality, which is free from a blow hole defect is obtained. |
