| 摘要 |
PURPOSE:To produce thin walled casting products having thick walled parts in part of the products easily without flash by forming part of the thick walled parts of cavities in a chiller, and reducing the pressure in the molds then charging molten metal onto a metallic foil thereby melting the metallic foil. CONSTITUTION:The inside of a pressure reducing chamber 10 is evacuated to reduce the pressure over the entire part of a mold 8 through holes 17 for evacuation. In this time, a chiller 9 energized by an elastic member 18 is brought into abutment airtightly on the opening part in the thick wall part 13 of a vacity 11 to reduce the pressure in the cavity 11 surely. Molten Al is charged from a metallic foil 22 facing a charging port 7 to melt the foil 22 by the heat of the molten metal. Since the inside of the cavity 11 is under reduced pressure, the molten metal is admitted and packed instantaneously therein, but the chiller 9 abuts tightly on the opening part of the part 13; therefore the production of flash by the leakage of the molten metal is prevented surely. Since the molten metal is charged onto the foil 22, the inclusion of gases is prevented as well. |
