Method of making a turbine engine component

Details Method of making a turbine engine component Method of making a turbine engine component

1989-01-25

1990-09-11

Seidel, Richard K.

Metal founding

Process

Shaping a forming surface

164 10, 164 18, 164112, 164108, 2988922, B22C 904

Patent

active

049554239

ABSTRACT:
A turbine engine component includes an annular array of airfoils which extend between inner and outer shroud rings. In order to accommodate thermal expansion of the airfoils, space is provided in a shroud ring rail. To provide space in the shroud ring rail, core material is positioned at the ends of the airfoils. The core material may be preformed separately from the airfoils or may be a coating which is applied to end portions of the airfoils. Wax pattern material partially encloses the end portions of the airfoils and core material. The shroud ring pattern and the core material are covered with ceramic mold material to form a mold. The shroud ring pattern is then removed from the mold to leave the core material disposed in the shroud ring mold cavity at the end portions of the airfoils. As the mold is preheated, bonds between the core material and the airfoils are broken and the core material is gripped between end portions of the airfoils and the ceramic mold material. The shroud ring mold cavity is then filled with molten metal which is solidified to form the shroud ring. The core material is then removed from the shroud ring to leave space to accomodate thermal expansion of the airfoils.

REFERENCES:
patent: 2402418 (1946-06-01), Kroon
patent: 2681788 (1954-06-01), Wosika
patent: 3985176 (1976-10-01), Wamester
patent: 4062396 (1977-12-01), Day
patent: 4182122 (1980-01-01), Stratton et al.
patent: 4489469 (1984-12-01), Hall
patent: 4674552 (1987-06-01), Howe
patent: 4728258 (1988-03-01), Blazek et al.

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