US3804147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous rotary method of casting metal utilizing a magnetic field
Assignee: ETUDES DE CENTRIFUGATION
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Filing: 1971-03-30
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Granted: 1974-04-16
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Expires: 1991-03-30
Abstract
Abstract Steel blanks or billets are cast by the continuous rotary casting method by effecting in the moulten core of the blank or billet an axial circulation of the liquid metal. This circulation is created by electromagnetic fields induced by inductors which surround the blank or billet. The circulation is downwards near the axis of the blank or billet and upwards along the walls or skin of the blank or billet.
Inventors
- 👤 L Babel
- 👤 M Mola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:11
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/12; B22D11/122
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
In the method of continuously casting metal by pouring molten metal into the upper end of a vertical mold while cooling said mold and rotating it about its vertical axis to form a casting from said metal, the improvement which comprises the step of utilizing a magnetic field to establish an axial circulation of the molten metal, beneath said mold, only in a localized portion of the molten metal near the bottom of the molten metal pool in said casting, the direction of said axial circulation being towards the bottom in the central region of the pool and towards the top of the periphery of said pool.
Claim 2
Dependent Claim
107 words
In the method of continuously casting metal by pouring molten metal into the upper end of a vertical mold while cooling said mold and rotating it about its vertical axis to form a casting from said metal, the improvement which comprises the step of utilizing a magnetic field to establish an axial circulation of the molten metal, beneath said mold, only in a localized portion of the molten metal near the bottom of the molten metal pool in said casting, the direction of said axial circulation being towards the bottom in the central region of the pool and towards the top of the periphery of said pool.
Claim 3
Dependent Claim
43 words
A method according to claim 1 in which the circulation of the liquid metal is effected by the electro-magnetic field induced by a group of several inductors located at the periphery of the blank and each supplied by a phase of polyphase current.
Claim 4
Dependent Claim
23 words
A method according to claim 2, in which currents having an intensity of between 2,000 and 10,000 amps are passed through the inductors.
Claim 5
Dependent Claim
28 words
A method according to claim 2, in which the inductors are supplied with a low voltage, for example, equal to several fractions of a volt or several volts.
Claim 6
Dependent Claim
29 words
A method according to claim 2 in which the polyphase current has a low frequency for example, less than 100 and preferably between 5 and 60 cycles per second.
References Cited (Backward Citations)
CA531772A
Cited
US2763040A
Cited
FR1140200A
Cited
US2963758A
Cited
US3430684A
Cited
US3583469A
Cited
DE1807435A1
Cited
US3623535A
Cited
US3693697A
Cited
US3702630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |