Method for casting and controlling wall thickness

Details Method for casting and controlling wall thickness Method for casting and controlling wall thickness

1996-12-03

1999-09-14

Pyon, Harold

Metal founding

Process

Shaping liquid metal against a forming surface

164516, 164 35, 1641221, B22D 3304, B22C 904

Patent

active

059507055

ABSTRACT:
A method for casting a turbine bucket with at least one surface cooling hole. The method comprises positioning at least one preformed spacer device on a core, where the preformed spacer device is formed of ceramic materials and comprises opposed end plates and at least one interconnecting crossover pin connecting the end plates; forming a layer of temporary material, such as wax, over the core and around the at least one preformed spacer device; forming a shell mold over the layer of temporary material to cover it, the core and the at least one preformed spacer device. The shell mold is maintained stably positioned and spaced from the core by the at least one preformed spacer device, which connects and maintains the shell mold and the core as a stable body. The wax is removed to form a casting space for the turbine bucket between the shell mold and the core and around the at least one preformed spacer device. A liquid metal material, is placed into the casting space between the shell mold and the core and around the at least one preformed spacer device. Once the liquid metal material has hardened, the shell mold, the core and the at least one preformed spacer device, are removed to form the cast turbine bucket having the wall. The removal of the at least one preformed spacer device creates the at least one nozzle on the surface of the turbine bucket.

REFERENCES:
patent: 5295530 (1994-03-01), O'Connor et al.
patent: 5623985 (1997-04-01), Wheaton et al.

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