Systems, devices, and methods involving precision component castings
Certain exemplary embodiments can provide a system, machine, device, manufacture, and/or composition of matter configured for and/or resulting from, and/or a method for, activities that can comprise and/or relate to, investment casting a product in a mold, the product comprising at least one wall, the mold comprising a core, an inner primary shell, and an outer secondary shell.
1. A method comprising:
investment casting an airfoil in a mold, the airfoil comprising at least one wall, the mold comprising a core, an inner primary shell, and an outer secondary shell, the core seamlessly combined with the inner primary shell and integral with the inner primary shell yet substantially separated from the inner primary shell by one or more core gaps, the inner primary shell substantially separated from the outer secondary shell by one or more shell gaps, the inner primary shell defining an exterior of the airfoil, the inner primary shell constructed of the same material as the core.
2. The method of claim 1 , wherein:
each of the one or more core gaps is defined by a length, a width that is perpendicular to the length, and a thickness that is perpendicular to the length and the width; and
the thickness of each core gap varies in a predetermined manner along the length and/or width of that core gap.
3. The method of claim 1 , wherein:
the inner primary shell is defined by a length, a width that is oriented orthogonal to the length, and a thickness that is oriented orthogonally to the length and the width; and
the thickness varies in a predetermined manner along the length and/or width of the inner primary shell.
4. The method of claim 1 , wherein:
each of the one or more shell gaps is defined by a length, a width that is perpendicular to the length, and a thickness that is perpendicular to the length and the width; and
the thickness of each shell gap varies in a predetermined manner along the length and/or width of that shell gap.
5. The method of claim 1 , wherein:
the outer secondary shell is defined by a length, a width that is oriented orthogonal to the length, and a thickness that is oriented orthogonally to the length and the width; and
the thickness varies in a predetermined manner along the length and/or width of the outer secondary shell.
6. The method of claim 1 , wherein:
the inner primary shell comprises a plurality of features that are configured to increase a strength of the inner primary shell in predetermined portions of the inner primary shell.
7. The method of claim 1 , wherein:
the inner primary shell comprises a plurality of features that each have a predetermined shape and each located at a predetermined location.
8. The method of claim 1 , wherein:
the inner primary shell comprises a plurality of surface features that are configured to increase a surface area of the inner primary shell.
9. The method of claim 1 , wherein:
the inner primary shell comprises a plurality of surface features that are configured to increase a surface roughness at periodic locations on a surface of the inner primary shell.
10. The method of claim 1 , wherein:
the inner primary shell comprises a plurality of surface features that each define an undercut in a surface of the inner primary shell.
11. The method of claim 1 , wherein:
the inner primary shell comprises a handling connection configured for automated casting.
12. The method of claim 1 , wherein:
the inner primary shell and/or outer secondary shell comprises an engineered weakness area configured for facilitating a breaking away of the inner primary shell for removal of the cast airfoil.
13. The method of claim 1 , wherein:
the inner primary shell comprises a plurality of surface features that each have a depth within the range of 0.38 mm and 0.66 mm.
14. The method of claim 1 , wherein:
the inner primary shell and core are formed from a different material than the outer secondary shell.
15. The method of claim 1 , wherein:
the outer secondary shell is formed via a dipping process.
16. The method of claim 1 , wherein:
the mold comprises a plurality of prongs that extend between and seamlessly connect the core and the inner primary shell, the plurality of prongs defining a corresponding plurality of film cooling holes in the airfoil, each of the plurality of prongs defines a fillet having a predetermined radius, the fillet located at an intersection of the prong and the inner primary shell or at an intersection of the prong and the core.
17. The method of claim 1 , wherein:
the mold comprises a plurality of prongs that extend between and seamlessly connect the core and the inner primary shell, the plurality of prongs defining a corresponding plurality of film cooling holes in the airfoil, each of the plurality of holes defines a single passage that transitions to two or more passages.
18. A method comprising:
investment casting a product in a mold, the product comprising at least one wall, the mold comprising a core, an inner primary shell, and an outer secondary shell, the core integral with the inner primary shell yet substantially separated from the inner primary shell by one or more core gaps, the inner primary shell substantially separated from the outer secondary shell by one or more shell gaps, the inner primary shell defining an exterior of the product, the inner primary shell constructed of the same material as the core.
19. An airfoil investment casting mold comprising:
a core;
an inner primary shell; and
an outer secondary shell;
wherein:
the core is seamlessly combined with the inner primary shell and integral with the inner primary shell yet substantially separated from the inner primary shell by one or more core gaps;
the inner primary shell substantially separated from the outer secondary shell by one or more shell gaps;
the inner primary shell defines an exterior of an investment cast airfoil; and
the inner primary shell is constructed of the same material as the core.
20. An investment casting mold comprising:
a core;
an inner primary shell; and
an outer secondary shell;
wherein:
the core is integral with the inner primary shell yet substantially separated from the inner primary shell by one or more core gaps;
the inner primary shell substantially separated from the outer secondary shell by one or more shell gaps;
the inner primary shell defines an exterior of an investment cast product; and
the inner primary shell is constructed of the same material as the core.