Water soluble polymer for core forming
AssigneeRaytheon Technologies Corporation
InventorsJohn R. Paulus, Roy Eakins, Richard A. Hawkins
Life of this patent
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Abstract
A core forming method is provided for forming a core. The core forming method includes forming one or more mold parts of water-soluble polymer (WSP), each mold part including a bond area and a part forming area, moistening the bond areas, bonding the mold parts together with the bond areas moistened and the part forming areas aligned to form a cavity shaped as a negative of the core, injecting a slurry, which is non-reactive with the WSP, into the cavity and removing the WSP with water once the slurry is cured.
Claims20
A method for forming a core for use in investment casting, comprising:
- forming first and second mold parts of water-soluble polymer (WSP), each mold part comprising a bond area and a part forming area;
- moistening the bond areas;
- bonding the first and second mold parts together with the bond areas moistened and the part forming areas aligned to form a cavity shaped as a negative of the core;
- injecting a slurry, which is non-reactive with the WSP, into the cavity;
- and
- removing the WSP with water once the slurry is cured.
A method for forming a core for use in investment casting, comprising:
- forming first and second mold parts of water-soluble polymer (WSP), each of the first and second mold parts comprising a bond area and a part forming area;
- moistening the bond areas;
- bonding the first and second mold parts together with the bond areas moistened and the part forming areas aligned to form a cavity shaped as a negative of the core;
- injecting a non-aqueous slurry, which is non-reactive with the WSP, into the cavity;
- and
- removing the WSP with water once the non-aqueous slurry is cured.
A method for forming a core for use in investment casting, comprising:
- forming first and second mold parts of water-soluble polymer (WSP), each mold part comprising a bond area and a part forming area;
- moistening the bond areas;
- bonding the first and second mold parts together with the bond areas moistened and the part forming areas aligned to form a cavity shaped as a negative of the core;
- injecting a coating into the cavity to coat the part forming areas;
- injecting a slurry, which is isolated from the WSP by the coating, into the cavity;
- and
- removing the WSP with water once the slurry is cured.
Dependencies are inferred from the claim text.