| 摘要 |
PURPOSE:To obtain a casting having good surface roughness and sound internal quality, by embedding a casting mold together with a specific heat insulation material in a heat resistant vessel, and calcining the same then charging molten metal into the casting mold. CONSTITUTION:A shell mold casting mold 1 made of a ceramics is disposed in a cup-shaped heat-resistant vessel 2, and a heat insulation material 3 of a hollow ball shape having 2-5mm. diameter is packed in the space around the mold 1 in the vessle 21. The mold 1 is embedded except the sprue 1a in the top part thereof in the material 3 and the assembly is put in a heating furnace and the mold is calcined. The assembly is removed from the heating furnace after the calcining, and the mold together with the vessel 2 is shifted to a prescribed casting place such as a vacuum casting furnace where molten metal is charged into the mold 1. The good casting is thus obtd., and the handling of the casting mold during the movement thereof is made easy as the heat insulation material used is light in weight. |
