| 摘要 |
PURPOSE:To control effectively the flow rate of a molten metal by embedding blocks made of a good heat conductive material in the parts of a metallic mold where the sectional area of the cavity thereof changes, disposing thermosensors therein and changing the flow rate of the molten metal in accordance with the temp. detected by said sensors. CONSTITUTION:The compressed air in a surge tank 22 is supplied successively to the space in a furnace 13 via a throttle valve 27 and a check valve 22 when a reducing valve 23 and a reducing valve 25 are opened upon starting of casting. The molten metal 14 is forced upward by the resulted pressure increase by which the molten metal is successively forced upward into the 1st large area part 12a and 2nd large area part 12b of the cavity 12. The blocks 17, 18 made respectively of the good heat conductive material are embedded into the parts of the cavity 12 where the sectional area changes and the thermosensors 19, 20 are disposed therein. The feed rate of the compressed air from the tank 22 is changed according to the temp. increase detected by said sensors, by which the flow rate of the molten metal 14 is changed.
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