Injection mold for a wax model of a turbine blade having an isostatic core holder

An injection mold for producing a model of a turbine engine blade to be produced by a lost wax casting technique, comprising:

• an upper face that folds onto a lower face, the two faces including a footprint reproducing an external shape of the blade to be produced and carrying long rods for supporting a core configured to generate cooling cavities inside the blade, the core having a shape of an aerofoil between a root and a tip and extending within a predetermined clearance envelope in a case of deformation of the core, the long rods of the lower face configured to come into contact with a first face of the aerofoil in a region of bearing points and the long rods of the upper face configured to come into contact with a second face of the aerofoil in a region of clamping points, each clamping point of the second face being positioned opposite a bearing point of the first face;
• at least one short rod extending from one of the faces of the mold and pointing toward a false point positioned on one of the faces of the aerofoil, a length of the short rod being less than a distance between a face of the mold and that of the aerofoil in a region of the false point and a difference between the length and the distance being equal to a tolerance at a position of the false point.