| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for molding a water soluble mold, in a recycle molding method for a core, which can achieve the further improvement of productivity, concretely, can satisfy the requirements of (1) the reduction of molding time, (2) the reduction of heat cost, (3) the improvement of mold releasability or the like. SOLUTION: In the method for molding a water soluble mold, kneaded casting sand obtained by adding a water-soluble inorganic salt to casting sand is blown and filled into a molding mold so as to mold a mold, after the use of the mold, it is collapsed by water contact, and the reutilization of the casting sand is made possible. The drying and curing of the mold before mold releasing is performed in such a manner that the temperature of the mold before the mold releasing is made higher than the boiling point of water under the reduced pressure, and is also made lower than the boiling point of water under the atmospheric pressure, and also in such a manner that the mold for molding is placed under the reduced pressure, thus, e.g., the water is evaporated. In this way, the mold can be dried in a short time till it reaches a dry strength at which treatable strength or above is obtained. COPYRIGHT: (C)2011,JPO&INPIT |
