APPARATUS FOR MAKING CASTINGS OF TURBINE COMBINED-STRUCTURE BLADES Russian patent published in 1996 - IPC

FIELD: casting production, particularly, casting of blades with oriented and monocrystalline structure. SUBSTANCE: apparatus comprises ceramic shell mold with starting cavity of blade and working cavity. starting cavity includes three different-dimension cavities arranged by two floors. Two of three cavities have bottom portion have inlet and outlet edges and they are terminated by seed cavities with refractory seeds having monocrystalline predetermined crystallographic structure. Third mean portion of blade is formed by profile extension and it is terminated by seed cavity with refractory insert with equiaxial structure. EFFECT: maximum heat resistance and thermal shock resistance of edges, enhanced fatigue characteristics. 1 dwg, 1 tbl