Wax to be used in the investment casting molds has a drawback that size is likely to change because of the repeated expansion and contraction due to changes in the temperature of the room. Thus, when drying the mold, it is generally carried out in natural air-drying over a long time under the environment maintained at a constant temperature and humidity. For this reason, the molding process of the lost wax mold, usually takes about one week to dry. The author has developed the technologies to dry each layers more efficiently applying microwave to this process.
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