Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1990-07-03
1991-11-05
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
164361, B22C 904
Patent
active
050624687
ABSTRACT:
A mold structure includes an article mold having a mold cavity with a configuration corresponding to the configuration of the article to be cast. A starter section contains a starter cavity in which a plurality of crystals form. A crystal selector has a passage which extends between an upper end of the starter cavity and a lower end of the article mold cavity. To promote the growth in the crystal selector passage of a crystal having primary and secondary orientations corresponding to selected primary and secondary orientations of the article, the crystal selector passage has a portion which slopes downwardly in the direction of solidification of metal along the crystal selector passage. Without the use of a seed crystal, the cast article will have a secondary orientation axis which is almost always within plus or minus 30 degrees of a selected secondary orientation axis. Through the use of a seed crystal, the secondary orientation axis of the cast article will correspond to the selected secondary orientation axis.
REFERENCES:
patent: 3739835 (1973-06-01), Copley et al.
patent: 3888301 (1975-06-01), Hayes
patent: 4969501 (1990-11-01), Brokloff et al.
Graham Lawrence D.
Jeyarajan Arunachalam
Monte Louis H.
Lin Kuang Y.
PCC Airfoils, Inc.
Tarolli Sundheim & Covell
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