US3672432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bottom poured ingots
Assignee: British Iron and Steel Research Association BISRA
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Filing: 1970-12-03
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Granted: 1972-06-27
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Expires: 1990-12-03
Abstract
Abstract In the known bottom poured method of casting steel ingots molten metal is poured down a runner system communicating with the bottom of the ingot mould. With the invention the runner system is made pressure tight and a pressurized gas is applied to the top of the upstanding runner of the runner system to displace some of the metal in the runner system into the mould. The mould may be of the bottle top type with a heat conducting plug for making a non-gas tight closure at the top of the mould, and pressurized gas may be applied so that metal in the mould contacts the plug.
Inventors
- 👤 Roy Widdowson
- 👤 Gene Donald Speceley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:48
CPC Classifications
B; B22; B22D; B22D9/00; B22D9/006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
188 words
A method of bottom poured casting in which molten metal is poured into an upstanding runner which together with a cross runner in a base for an ingot mould forms a runner system communicating with the lower end of a bottle top type of ingot mould positioned on the base, in which metal is first poured downwardly into the upstanding runner to enter the mould and fluid under pressure is then applied to the metal in the upstanding runner to displace at least some of the metal remaining in the runner system into the mould so that metal in the mould contacts a heat conducting plug which makes a non-gas tight closure at the top of the mould to solidify the metal at the top of the mould, and in which the pressure of said fluid is maintained for a period to displace more metal into the mould to compensate for the contraction that takes place as a result of metal solidifying at the top of the mould and to enable metal to solidify sufficiently to prevent it running out of the mould upon release of said pressure.
Claim 2
Independent Claim
188 words
A method of bottom poured casting in which molten metal is poured into an upstanding runner which together with a cross runner in a base for an ingot mould forms a runner system communicating with the lower end of a bottle top type of ingot mould positioned on the base, in which metal is first poured downwardly into the upstanding runner to enter the mould and fluid under pressure is then applied to the metal in the upstanding runner to displace at least some of the metal remaining in the runner system into the mould so that metal in the mould contacts a heat conducting plug which makes a non-gas tight closure at the top of the mould to solidify the metal at the top of the mould, and in which the pressure of said fluid is maintained for a period to displace more metal into the mould to compensate for the contraction that takes place as a result of metal solidifying at the top of the mould and to enable metal to solidify sufficiently to prevent it running out of the mould upon release of said pressure.
Claim 3
Dependent Claim
170 words
In a method of manufacturing a poured casting in a bottom filled, bottle top type of ingot mold connected with an upstanding and a cross runner system, the steps comprising: filling the mold and runner system with molten metal; applying fluid under pressure to the molten metal in the upstanding runner displacing at least some of the metal therein into the mold and completely filling it; extracting heat from the molten metal at the top of the mold by contacting it with a gas pervious heat conducting plug and solidifying it while maintaining the fluid pressure on the molten metal in the runner system; continuing applying said fluid pressure in the runner system displacing more molten metal into the mold and compensating for contraction taking place as the metal solidifies at the top of the mold, and maintaining said pressure in the runner system at least until the metal in the mold has solidified sufficiently to prevent it from running out of the mold when the fluid pressure is released.
Claim 4
Dependent Claim
170 words
In a method of manufacturing a poured casting in a bottom filled, bottle top type of ingot mold connected with an upstanding and a cross runner system, the steps comprising: filling the mold and runner system with molten metal; applying fluid under pressure to the molten metal in the upstanding runner displacing at least some of the metal therein into the mold and completely filling it; extracting heat from the molten metal at the top of the mold by contacting it with a gas pervious heat conducting plug and solidifying it while maintaining the fluid pressure on the molten metal in the runner system; continuing applying said fluid pressure in the runner system displacing more molten metal into the mold and compensating for contraction taking place as the metal solidifies at the top of the mold, and maintaining said pressure in the runner system at least until the metal in the mold has solidified sufficiently to prevent it from running out of the mold when the fluid pressure is released.
Claim 5
Dependent Claim
32 words
A method as claimed in claim 2 in which the fluid pressure displaces substantially all of the molten metal in the upstanding runner into the cross runner and into the ingot mold.
Claim 6
Dependent Claim
45 words
A method as claimed in claim 2 in which the fluid pressure displaces all of the molten metal in the upstanding runner into the cross runner and into the mold, and displaces substantially all of the molten metal in the cross runner into the mold.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |