| 摘要 |
PURPOSE:To eliminate sprue clogging and misrun and to decrease casting defects by internally providing low m.p. materials which melt to prevent overheating in the stage of pouring and solidify to prevent overcooling after taking out of a work to the parts of metallic molds for die casting where temp. control is required. CONSTITUTION:The material 13 among the low m.p. materials 13-16 is internally provided to the periphery of a sprue 2, the material 14 to the periphery of a stalk 11 near the sprue 2, and the materials 15, 16 are internally provided to the lateral side in the thin-walled part 9 of a cavity 8. The quantity of heat absorption or heat radiation of the materials 13-16 can be adequately set by properly increasing or decreasing the materials according to conditions. The materials 13-16 melt by absorbing the heat of the molten metal bath of a high temp. and accumulate the heat in the stage of pouring said bath when the materials 13-16 are internally provided in the above-mentioned positions. The materials 13-16 solidify by releasing the accumulated latent heat to prevent the temp. drop of the sprue 2, the stalk 11 and the thin- walled part 9 when the metallic molds cool after pouring. The metallic molds are thus maintained at the adequate temp. |
