| 摘要 |
PURPOSE:To form integrally and efficiently a flat heat transmission pipe and fins by reducing the pressure in a pin fin casting mold from the top end thereof, pressurizing the molten metal in a holding furnace below the casting mold and pouring the molten metal into the casting mold in the flat heat transmission pipe part and pin fin part. CONSTITUTION:The pressure in a reduced pressure vessel 7 is reduced through a pipe 6 connected to a vacuum pump; at the same time gaseous argon is introduced into a cavity part 14 of the holding furnace 8 through an introducing pipe 18 to pressurize the top surface of molten aluminum 11 held at a prescribed temp. The molten metal 11 is thereby raised in a pouring sleeve 19 to intrude through a pouring port 15 into the cavities 4A, 4B of the casting mold, thus filling the cavities. The introduction of the gaseous argon is ceased upon solidification to return the molten metal 11 below the port 15 into the furnace 8. The master molds 1A, 1B are transferred from the upper part of the furnace 8 to another table and the molds 1A and 1B are opened laterally, then the pin fin heat transmission pipe united with the flat heat transmission pipe 16-1 and pin fins 16-2 made of the solidified aluminum alloy is obtd.
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