PROCESS FOR PRODUCING COMPLEX CERAMIC CORES FOR FOUNDRY.

摘要

The present invention relates to a process for producing a complex core for foundry ceramics, of the type having recesses which extend inside said core, said core being intended for the manufacture of a hollow part comprising internal cavities and partitions, in particular a turbomachine blade, by the known casting method known as lost wax. BR/ This process is characterized in that said solid body (8) is produced by successive injections and superimposed, in at least one mold, of at least two compositions, one of which is degradable without affecting the other than the others, the first injection making it possible to create a blank (9) consisting of one or the other of said compositions, and the following successive injections making it possible to cover, at least in part, the external surface of the blank (9) obtained in the previous injection, a layer of material (10) constituted by the injected composition. / P