US3633648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of casting in investment molds having a radiation shield
Assignee: RTX Corp
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Filing: 1970-04-24
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Granted: 1972-01-11
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Expires: 1990-04-24
Abstract
Abstract In making columnar grained or single-crystal castings, the mold is heated prior to pouring and a meltable metallic shield is placed on the chill plate to serve as a heat shield between the mold and the plate during heating of the mold and also to prevent condensation of impurities on the chill plate.
Inventors
- 👤 Robert B Barrow
- 👤 Bruce E Terkelsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:14
CPC Classifications
B; B22; B22D; B22D27/00; B22D27/04; B22D27/045; C; C30; C30B; C30B11/00; C30B11/003
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
163 words
The process of casting high-temperature alloys in a heated shell mold including, providing a mold having an open lower end, positioning the mold on a chill plate such that the plate closes the open end, placing a thin nonflat metallic shield made from at least one of the metals of the alloy within the mold adjacent to and substantially covering the portion of the chill plate within the mold, with the greater portion of the shield spaced from the chill plate, to shield the chill plate from radiant heat from the mold as it is heated, heating the mold to a temperature above the melting temperature of the alloy, substantially preventing condensation of vaporized impurities in the casting cavity by heating the shield by radiant heat from the mold during heating of the mold, and pouring melted alloy into the mold for forming the casting such that the material of the shield is caused to melt and be dissolved into the poured alloy.
Claim 2
Dependent Claim
163 words
The process of casting high-temperature alloys in a heated shell mold including, providing a mold having an open lower end, positioning the mold on a chill plate such that the plate closes the open end, placing a thin nonflat metallic shield made from at least one of the metals of the alloy within the mold adjacent to and substantially covering the portion of the chill plate within the mold, with the greater portion of the shield spaced from the chill plate, to shield the chill plate from radiant heat from the mold as it is heated, heating the mold to a temperature above the melting temperature of the alloy, substantially preventing condensation of vaporized impurities in the casting cavity by heating the shield by radiant heat from the mold during heating of the mold, and pouring melted alloy into the mold for forming the casting such that the material of the shield is caused to melt and be dissolved into the poured alloy.
Claim 3
Dependent Claim
46 words
The process of claim 1 in which the shield is positioned to shield the chill plate from the heat of the mold and including the step of supporting the shield such that the greater portion of the shield is out of contact with the chill plate.
Claim 4
Dependent Claim
35 words
The process of claim 1 including the additional step of forming a plurality of creases in a sheet of metal to form the shield into a nonflat configuration prior to placing it in the mold.
Claim 5
Dependent Claim
27 words
The process of claim 1 including the additional step of causing solidification of the alloy by the removal of heat from the alloy to the chill plate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |