Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1995-02-23
1997-01-14
Hail, III, Joseph J.
Metal founding
Process
Shaping liquid metal against a forming surface
164120, 164 681, 1641221, 164256, B22D 2715, B22D 2709, B22D 2700
Patent
active
055929842
ABSTRACT:
A method of making a directionally solidified casting by casting a melt in a mold cavity of an investment mold having a core therein to form an internal casting surface feature involves evacuting the mold cavity while the investment mold is disposed on a chill member with the mold cavity communicating to the chill member, and introducing the melt into the evacuted mold cavity about the core so that the melt contacts the chill member for unidirectional heat removal and directional solidification. Then, gaseous pressure is applied to the melt cast in the mold cavity rapidly enough after introduction in the mold cavity to reduce localized void regions present in the cast melt as a result of surface tension effects between the melt and the core.
REFERENCES:
patent: 3977462 (1976-08-01), Ohara
patent: 4832105 (1989-05-01), Nagan et al.
patent: 5226946 (1993-07-01), Diehm et al.
patent: 5335711 (1994-08-01), Paine
Rauguth Brad L.
Schmiedeknecht Dean L.
Straszheim Mark J.
Thompson Dennis J.
Hail III Joseph J.
Howmet Corporation
Lin I.-H.
Timmer Edward J.
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