| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a core for investment casting with which in the core used for the investment casting forming a hollow casting or a casting having a complicated three-dimensional shape, the sufficiently bearable strength when a wax pattern is injection-formed, is provided and the sufficiently bearable hot-strength to the burning and the casting of a mold is provided and the burning to the core-self is unnecessary and the productivity of the mold is high at a low cost and the core has a good collapsibility with a physical means and is easily removed and this method is suitable to the reduc tion of the cost. SOLUTION: In the core used for the investment casting forming the hollow casting or the casting having the complicated three-dimensional shape, the manufacturing method of this core is peculiarly formed with a kneaded material of an aggregate and an organic binder, impregnated with an inorganic binder for high temperature adding a surfactant or a kneaded material of the inorganic binder and a refractory filler to the formed core and further, this impregnating process is performed under reduced pressure having not higher than the atmosphere.
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