Patent US3882923A successfully refreshed from Google Patents.
US3882923A
Expired / Lapsed
US
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Apparatus for magnetic stirring of continuous castings
Assignee: Institut de Recherches de la Siderurgie Francaise IRSID
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Filing: 1973-06-04
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Granted: 1975-05-13
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Expires: 1993-06-04
Abstract
Abstract The molten interior of a continuously cast metal slab is magnetically stirred by mounting inside one or more of the supporting and guiding rolls for the case ingot emerging from the casting mold an electrical inductor connected to a multi-phase current source so that a mobile magnetic field is generated.
Inventors
- 👤 Robert Alberny
- 👤 Jean Delassus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:23
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/12; B22D11/122
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
167 words
In a casting apparatus for continuously casting a metal ingot of an elongated transverse cross section, which comprises an open-ended casting mold and a plurality of supporting and guiding elements arranged in succession adjacent the mold for engaging respective ones of the ingot faces as the cast ingot emerges from the mold, the succession of elements supporting and guiding the cast ingot through a treatment zone wherein the interior of the cast ingot contains molten metal, the improvement including 1. at least one of the supporting and guiding elements defining an interior cavity, 2. an electrical inductor structure arranged within the cavity, and 3. a source of multi-phase current, a. the inductor structure being connected to the current source for generating a mobile magnetic field extending through the supporting and guiding element wherein the inductor structure is arranged into the molten interior of the cast ingot for magnetically stirring the molten metal in the interior while the cast ingot is supported and guided through the treatment zone.
Claim 2
Dependent Claim
167 words
In a casting apparatus for continuously casting a metal ingot of an elongated transverse cross section, which comprises an open-ended casting mold and a plurality of supporting and guiding elements arranged in succession adjacent the mold for engaging respective ones of the ingot faces as the cast ingot emerges from the mold, the succession of elements supporting and guiding the cast ingot through a treatment zone wherein the interior of the cast ingot contains molten metal, the improvement including 1. at least one of the supporting and guiding elements defining an interior cavity, 2. an electrical inductor structure arranged within the cavity, and 3. a source of multi-phase current, a. the inductor structure being connected to the current source for generating a mobile magnetic field extending through the supporting and guiding element wherein the inductor structure is arranged into the molten interior of the cast ingot for magnetically stirring the molten metal in the interior while the cast ingot is supported and guided through the treatment zone.
Claim 3
Dependent Claim
9 words
an electrical inductor structure arranged within the cavity, and
Claim 4
Dependent Claim
9 words
an electrical inductor structure arranged within the cavity, and
Claim 5
Dependent Claim
44 words
In the casting apparatus of claim 1, the supporting and guiding element comprises a tubular body of non-magnetic material and of circular cross section, the interior cavity extending axially within the tubular body and the inductor structure being arranged coaxially within the axial cavity.
Claim 6
Dependent Claim
63 words
a source of multi-phase current, a. the inductor structure being connected to the current source for generating a mobile magnetic field extending through the supporting and guiding element wherein the inductor structure is arranged into the molten interior of the cast ingot for magnetically stirring the molten metal in the interior while the cast ingot is supported and guided through the treatment zone.
Claim 7
Dependent Claim
63 words
a source of multi-phase current, a. the inductor structure being connected to the current source for generating a mobile magnetic field extending through the supporting and guiding element wherein the inductor structure is arranged into the molten interior of the cast ingot for magnetically stirring the molten metal in the interior while the cast ingot is supported and guided through the treatment zone.
Claim 8
Dependent Claim
31 words
In the casting apparatus of claim 2, all the supporting and guiding elements being rolls and the tubular body being of the identical exterior shape as adjacent ones of the rolls.
Claim 9
Dependent Claim
79 words
In the casting apparatus of claim 2, the inductor structure comprising a magnetic core defining a plurality of annular peripheral grooves axially spaced from one another, and annular coils being arranged coaxially within respective ones of the annular grooves, the coils being so connected to the current source as to generate a magnetic travelling field, the direction of displacement of the magnetic travelling field being parallel to the generatrix of the tubular body of the supporting and guiding element.
Claim 10
Dependent Claim
43 words
In the casting apparatus of claim 4, a phase-reversing switch arranged between the current source and the inductor structure, the switch being connected to two phases of the inductor structure to permit reversal of the direction of displacement of the travelling magnetic field.
Claim 11
Dependent Claim
76 words
In the casting apparatus of claim 2, the inductor structure comprising a magnetic core defining a plurality of longitudinal peripheral grooves angularly spaced from one another, and longitudinally extending wires arranged within respective ones of the longitudinal grooves, the wires being so connected to the current source as to generate a rotating magnetic field, the vector representative of the rotating magnetic field being displaced in a plane perpendicular to the longitudinal axis of the tubular body.
Claim 12
Dependent Claim
33 words
In the casting apparatus of claim 2, further comprising a pair of spindles carrying the tubular body and the inductor structure, and respective journals freely rotatably supporting a respective one of the spindles.
Claim 13
Dependent Claim
39 words
In the casting apparatus of claim 2, further comprising a stationary shaft, the inductor structure being affixed to The shaft, and roller bearings freely rotatably supporting the tubular body for free rotation about the stationary shaft and inductor structure.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |