| US 7,334,625 B2 | ||
| Manufacture of casting cores | ||
| Nicholas D. Judge, Olney, Ill. (US); Joseph J. Parkos, Jr., East Haddam, Conn. (US); and Gary M. Lomasney, Glastonbury, Conn. (US) | ||
| Assigned to United Technologies Corporation, Hartford, Conn. (US) | ||
| Filed on Sep. 19, 2005, as Appl. No. 11/230,080. | ||
| Prior Publication US 2007/0227683 A1, Oct. 04, 2007 | ||
| Int. Cl. B22C 9/00 (2006.01) | ||
| U.S. Cl. 164—28 [164/30; 164/31; 164/32] | 25 Claims |
| 1. A method for forming an investment casting core comprising:
cutting a patterned core precursor from refractory metal-based sheet, the cutting forming recast along cuts;
growing oxide on non-recast areas;
substantially chemically removing the recast but substantially leaving the oxide; and
shaping the core precursor.
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