| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a reduced pressure casting mold which enables a melt to be fully filled into a cavity with good run and prevents intrusion of air or gas by securely suppressing and preventing air-permeability in a simple configuration and accordingly decompressing the inside of the cavity, and also to provide a reduced pressure casting method, and further to provide a manufacturing method of the reduced pressure casting mold. <P>SOLUTION: The reduced pressure casting mold is provided with a main mold 1 and a core 2 which are made of cast sand. The reduced pressure casting mold is formed by fixing the core 2 in the main mold 1 by inserting the baseboards 20, 21 of the core 2 in the baseboard receivers 30, 31 of the main mold 1. The main mold 1 is formed by mixing fine powder having a grain size smaller than that of the cast sand into the cast sand. The baseboard receiver 30 of the main mold 1 communicates with the outside and connects with a decompression means. In the main mold 1, the gap between the cast sand particles having a relatively large grain size is filled with the fine powder. The core 2 has air-permeability. <P>COPYRIGHT: (C)2009,JPO&INPIT |
