Method for manufacturing ceramic cores, internal molds and water-soluble molded bodies for manufacturing ceramic cores

Abstract

This suppresses cracking in the columnar portion during the firing of ceramic cores. [Solution] The manufacturing method disclosed herein includes: preparing an outer mold having an internal cavity; placing an inner mold 50 having a columnar member 30 and a water-soluble molded body 20 in the internal cavity; filling the space between the outer mold and the inner mold 50 with a molding material F and solidifying it; dissolving the water-soluble molded body 20 with an aqueous solvent; and firing the molding material F and the columnar member 30. The columnar member 30 is a ceramic sintered body or glass. The water-soluble molded body 20 includes a through hole 22 into which the columnar member 30 is inserted, and damming portions 23 provided at both ends 22a and 22b in the axial direction of the through hole 22, which are in close contact with the outer surface of the columnar member 30. This makes it possible to manufacture a high-precision ceramic core while suppressing cracks in the columnar portion.

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