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US 12,434,295 B2Granted
Arcuate seed casting method
AssigneeRtx Corporation
InventorsDilip M. Shah, Shiela R. Woodard, Steven J. Bullied, Ryan C. Breneman
Life of this patent
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Abstract
A casting method includes: forming a seed, the seed having a first end and a second end, the forming including bending a seed precursor; placing the seed second end in contact or spaced facing relation with a chill plate; contacting the first end with molten material; and cooling and solidifying the molten material so that a crystalline structure of the seed propagates into the solidifying material. The forming further included reducing a thickness of the seed proximate the first end relative to a thickness of the seed proximate the second end.
Claims20
A casting method comprising:
- forming a seed, the seed having a first end and a second end, the forming including bending a seed precursor;
- placing the seed second end in contact or spaced facing relation with a chill plate;
- contacting the first end with molten material;
- and
- cooling and solidifying the molten material so that a crystalline structure of the seed propagates into the solidifying material,
- the forming further comprising creating a first region of reduced thickness relative to a thicker second region by removing material including at least one of:
- rendering a portion of the seed precursor proximate the first end less prone to stress from the bending than a portion of the seed precursor proximate the second end;
- relieving a stress in the seed proximate the first end relative to a stress in a portion of the seed proximate the second end;
- and
- removing stressed material in the seed proximate the first end relative to stressed material in the seed proximate the second end,
- wherein:
- during the casting, a melt back region of the seed does not extend below the first region to the second region.
9 more elements
A casting method comprising:
- forming a seed, the seed having a first end and a second end, the forming including bending a seed precursor;
- placing the seed second end in contact or spaced facing relation with a chill plate;
- contacting the first end with molten material;
- and
- cooling and solidifying the molten material so that a crystalline structure of the seed propagates into the solidifying material,
- the forming further comprising at least one of:
- rendering a portion of the seed precursor proximate the first end less prone to stress from the bending than a portion of the seed precursor proximate the second end;
- relieving a stress in the seed proximate the first end relative to a stress in a portion of the seed proximate the second end;
- and
- removing stressed material in the seed proximate the first end relative to stressed material in the seed proximate the second end,
- wherein:
- the rendering, relieving, or removing forms the seed as a stepped seed, and
- the casting is in a shell having a stepped seed cavity accommodating the stepped seed, a step of the seed cavity accommodating a step of the seed.
10 more elements
A casting method comprising:
- forming a seed, the seed having a first end and a second end, the forming including bending a seed precursor;
- placing the seed second end in contact or spaced facing relation with a chill plate;
- contacting the first end with molten material;
- and
- cooling and solidifying the molten material so that a crystalline structure of the seed propagates into the solidifying material,
- the forming further comprising at least one of:
- rendering a portion of the seed precursor proximate the first end less prone to stress from the bending than a portion of the seed precursor proximate the second end;
- relieving a stress in the seed proximate the first end relative to a stress in the seed proximate the second end;
- and
- removing stressed material in the seed proximate the first end relative to stressed material in the seed proximate the second end,
- wherein during the casting, a melt back region of the seed is limited to at least one of and does not extend to a region below said at least one of:
- the portion of the seed precursor proximate the first end;
- a portion of the seed proximate the first end and subject to said relieving;
- and
- a portion of the seed proximate the first end and subject to said removing material.
12 more elements
Dependencies are inferred from the claim text.