| 摘要 |
PURPOSE:To remove generated gas and wrapped air by forming one side or both sides of one pair of male and female forming molds by ceramics and assembling a porous permeable material having heat resistance in a core part or an insert part to form gas vent passage. CONSTITUTION:In the molding process, molten metal is pressurized by moving the insert 2 to downward as sucking forcedly in a cavity (b) through the porous ceramics 7'a in the female mold a2. At the same time or at a little before time of the pressurize, the sucking is started through the porous ceramics 3a, 3'a of the inserts 2, and by such a forced suction through the porous ceramics 3a, 3'a and 7'a, the gas generated in the cavity (b) and the wrapped air are removed to out of the cavity (b).
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