Patent ID: 8689855

Claim:
A tire vulcanizing mold manufacturing method of manufacturing a mold to which a surface shape of a plaster mold is transferred by pouring molten metal over a surface of the plaster mold and solidifying the molten metal, characterized in that the method comprises the steps of: mounting a blade on the surface of the plaster mold, the blade being provided with an anchor portion protruding from one end thereof and mounted in such a way that only the anchor portion is embedded in the plaster mold; covering a portion of the blade mounted on the surface of the plaster mold with a cover layer made of an easily destructible fire-resistant material; pouring molten metal over the surface of the plaster mold thus obtained to cast a mold to which the surface shape of the plaster mold is transferred and in which the blade is buried; removing the anchor portion protruding from a surface of the mold; removing the cover layer to form a slit around the blade; and making the slit communicate with a vent opening connected to an outside of the mold.