| 摘要 |
PURPOSE:To obtain a mold excellent in accuracy and durability, by reinforcing the essential part of the mold consisting of a sprayed metal layer by using reinforcing pins. CONSTITUTION:An inverted pattern is prepared basing on a model made of wood, etc., and the 2nd model M is formed by using the inverted pattern. The model M consisting of low-melting metal is fixed on a base plate by a spacer block 18, and many pins 10 of high-melting hard metals are implanted in the surface of the model M. Next, a hard metal of the same kind in material as the pins 10 is sprayed to form a hard metal layer 11. Next, a frame 2 is provided, into which a mixture of silica sand and sodium silicate is charged to form a reinforcing part 12 by forcing a CO2 gas into the mixture under pressure. The 2nd model M is melted in a furnace by heating it and is removed. A cavity, formed by removing the model M, is filled with a slica-sand-reinforcing body, and finally, the reinforcing part 12 of silica sand formed behind the sprayed hard- metal layer 11, is collapsed and removed to form a backing reinforcing-body by pouring a liquid molten-casting-metal into the collapsed part. Next, the reinforcing part of silica sand is collapsed and removed, and then a mold is completed by cutting off the projecting parts of the projecting pins 10. |
