| 摘要 |
PROBLEM TO BE SOLVED: To provide a casting technique which can abolish core elements holding first and second preforms. SOLUTION: As shown in Fig.(a), a second preform 13 is calmly placed on an aluminum molten metal 19. Then, as shown in (b), the second preform 13 floats on the aluminum molten metal 19 since its bulk density is smaller than that of the aluminum molten metal 19. Next, as shown in (c), using an upper die 17 movable to a direction in which the molten metal is pressurized to a lower die 16, the aluminum molten metal 19 is pressurized via the floated second preform 13, and the aluminum molten metal 19 is impregnated into the first preform 12 and the second preform 13. As shown in (b), the first preform 12 is held by the pressure of the molten metal 19, and the second preform 13 is made to float on the molten metal 19. As a result, core elements holding the first and second 12 and 13 preforms can be abolished. COPYRIGHT: (C)2009,JPO&INPIT
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