Method for making molds and mold components for casting single c

Details Method for making molds and mold components for casting single c Method for making molds and mold components for casting single c

1977-08-01

1978-09-05

Husar, Francis S.

Metal founding

Process

Shaping a forming surface

164 34, 164 44, 164 60, 164 45, 164 35, B22C 904, B22C 700, B22D 1502

Patent

active

041112520

ABSTRACT:
Disclosed is an improved method for making molds and mold components for use in casting single crystal articles. According to the improved method, a preformed and reusable replica of a mold growth cavity and crystal selector passage is provided, the replica including a cylinder in the form of the desired growth cavity and a helical strand in the form of the desired crystal selector passage, one end of the strand being attached to an end of the cylinder such that their axes are coincident. In one embodiment, the replica is coated with a thin layer of wax or other removable material and then utilized in a variety of mold making processes, including investment molding, to form a growth zone and helical crystal selector in the mold. After mold making, the embedded replica is removed from the mold by first removing the thin layer of wax to provide a clearance space between the replica and mold and then rotating the cylinder to unscrew the helical strand from the mold in the same manner that a threaded member is removed from a threaded hole. The replica is then reused to produce additional molds or mold components having a reproducible growth zone and helical crystal selector therein.

REFERENCES:
patent: 2770859 (1956-11-01), Henry
patent: 3461949 (1969-08-01), Nilson
patent: 3598172 (1971-08-01), Copley

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