| 摘要 |
PURPOSE:To produce a casting having beautiful surface by replacing the air in a dissipating model with inert gas and casting molten metal to the dissipating model after molding by inlaying the dissipating model into sands. CONSTITUTION:In a cavity 3 worked into the desired shape in a metallic mold 2, after forming the dissipating model 1 by foaming as heating expandable resin beads, the air in the model 1 is sucked by a vacuum pump 5 and replaced with the inert gas, such as N2 gas, etc., in cylinder 6. Next, the dissipating model 1 taken out from the metallic mold 2 is inlaid into the casting sand 8 in a flask 10 to form the mold 15, and the molten metal is poured toward sprue 16. The molten metal poured to the sprue 16 is filled up in the mold 15, while heat-decomposing the model 1, Then, while sucking monomer generated by heat-decomposition of model 1 or the air in the casting sand 8 by pump 14, the cast is executed. In this way, the casting having beautiful surface is obtd. |
