| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for effectively drying a plaster mold, in which a large-size resin pattern is embedded, without breaking the pattern. SOLUTION: A method for drying, dewaxing, and firing method for a plaster mold for precision casting comprises: a plaster mold forming step (A), wherein a resin pattern (a), to which a gate pattern is attached, is set in a mold form, plaster for precision casting is poured into the mold form, and the plaster is cured; a drying step (B), wherein the mold form is removed after curing the plaster, and then a plaster mold (P), in which the resin pattern (a) is embedded, is dried under a pressure reduced condition (I): a dewaxing step (C), wherein the plaster mold (P), in which the resin pattern (a) is embedded, is subjected to stepwise heating (II) with the gate (O) turned downward, and thermally melted, decomposed, and liquefied components of the resin pattern (a)is allowed to flow out from the gate (O); and a firing step (D), wherein the resin pattern (a) is burnt and extinguished, and further an excessive moisture in the plaster is removed. In addition, the stepwise heating in the dewaxing step is preferably conducted at a temperature zone of≤250°C, and, in the firing step, the resin pattern (a) is preferably burnt and extinguished at a temperature of 300°C-750°C. COPYRIGHT: (C)2006,JPO&NCIPI
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