Patent ID: 7533714

Claim:
A process for manufacturing a foundry core for casting a turbomachine blade, said core comprising at least one thin region with a thickness between 0.1 and 0.5 mm corresponding to a cavity in said turbomachine blade, said process comprising: providing a mold, forming a core in said mold by injecting a mixture into said mold, said mixture comprising a ceramic particle filler and an organic binder, wherein said mold is configured so as to provide, during said injecting, a channel with an opening sufficient to promote a flow of said mixture through said channel during said injecting and wherein, upon cooling, said mixture within said channel forms a thickened region in said core, said thickened region of said core having a thickness thicker than said thickness of said thin region, extracting said core from the mold, removing the binder from said core, and consolidating the core by heat treatment, wherein said process comprises a step of machining said thickened region after said step of extracting said core from said mold, and wherein said machining is performed on said thickened region so as to obtain said thin region of said core.