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US 8,122,583 B2Granted
Method of machining parts having holes
AssigneeUnited Technologies Corporation
InventorsBlake J. Luczak, Glenn A. Cotnoir, James T. Beals, Thomas M. Morin, Joseph J. Parkos, Jr.
Life of this patent
Estimating the term…
Abstract
Removing of a casting core from a metal casting leaves at least one opening in a surface of the metal. The opening is filled with a sacrificial material. The metal and sacrificial material are machined at the opening. After the machining, a remainder of the sacrificial material is removed.
Claims21
A method comprising:
- casting a metal in a mold cavity, the mold comprising a shell and a casting core partially embedded in the shell;
- removing the shell and core from the metal, the removing leaving at least one opening in a surface of the metal, the at least one opening formed by the casting core;
- masking with a non-liquid mask to form a skirt;
- filling the opening with a sacrificial material, the filling comprising, after the masking, an at least partial immersing in a vessel containing a liquid form of the material, wherein:
- during the immersing, the skirt allows an exposed portion of the metal to lie below a surface level of the liquid;
- one or more openings of the at least one opening are within the skirt;
- the immersing is sufficient to provide an up-flow of the liquid out of said one or more openings within the skirt responsive to introduction through another one or more others of the at least one opening outside the skirt;
- machining the metal and the sacrificial material at the at least one opening;
- and
- after the machining, removing a remainder of the sacrificial material.
7 more elements
A method comprising:
- casting a metal in a mold cavity, the mold comprising a shell and a casting core partially embedded in the shell;
- removing the shell and core from the metal, the removing leaving at least one opening in a surface of the metal, the at least one opening formed by the casting core;
- filling the opening with a sacrificial material, the filling including:
- blocking a first plurality of openings with a first epoxy of said material to seal the first plurality;
- and
- after said blocking, flowing a second epoxy of said material into the metal, the blocking including UV-curing before the flowing of the second epoxy;
- machining the metal and the sacrificial material at the at least one opening;
- and after the machining, removing a remainder of the sacrificial material.
5 more elements
Dependencies are inferred from the claim text.