Patent ID: 7562691

Claim:
A ceramic core used in the manufacture, by lost wax casting, of a finished turbomachine blade with cooling cavities and a squealer, said ceramic core comprising: at least a main core, wherein the main core comprises a squealer element shaped so as to constitute the squealer of the finished turbomachine blade and a cavity element shaped so as to constitute at least one cavity beneath the squealer in the finished turbomachine blade, wherein a space between the squealer element and cavity elements is shaped so as to constitute, at least in part, bottom wall of the squealer in the finished turbomachine blade, wherein said squealer element has a first side facing said space and transverse to a longitudinal axis of said turbomachine blade, and a second side opposite to said first side, and wherein said squealer element defines at least two recesses extending through said squealer element from said first side to said second side, and a secondary core shaped to constitute another cavity beneath the squealer in the finished turbomachine blade, said secondary core being connected to said main core via said squealer element of said main core and not via said cavity element of said main core, wherein said secondary core is connected to said squealer element by at least two ceramic rods attached to said squealer element and to said secondary core, each ceramic rod being configured to fit inside a corresponding one of said recesses, said rods and said recesses being configured so as to allow adjustable and precise positioning of said main and secondary cores relative to each other.