Foundry mold for the formation of turbine blade ceramic cores

A mold for producing a ceramic core by injecting a ceramic composition,

• the mold comprising a body in which a casting core cavity is formed, said cavity comprising a primary cavity and a secondary cavity connected by a plurality of segments allowing a passing of fluid between the primary cavity and the secondary cavity, the primary cavity and the segments defining recesses of a turbomachine blade and the shape of the ceramic core to be produced, the secondary cavity defining a non-functional part being adapted to be removed from the ceramic core,
• wherein the primary cavity and the secondary cavity are sub-volumes of the mold, and the plurality of segments that connect the primary cavity and the secondary cavity have reduced sections with respect to the primary cavity and the secondary cavity,
• said mold being characterized in that it comprises a primary arm configured in such a way as to allow an injection of ceramic composition into the primary cavity, and a secondary arm configured in such a way as to allow an injection of ceramic composition into the secondary cavity, and in that the ratio of the volume of the primary cavity to the volume of the secondary cavity is equal, plus or minus 15%, to the ratio of the volume of the primary arm to the volume of the secondary arm.