US5678623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casting equipment
Assignee: Norsk Hydro ASA
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Filing: 1996-04-10
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Granted: 1997-10-21
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Expires: 2016-04-10
Abstract
Abstract Casting equipment for continuous or semi-continuous direct chill casting of metals, in particular the casting of billets or ingots of aluminum, has a mold cavity (4) with an inlet (2) that is upwardly open, an intermediate, inwardly facing and heat insulated overhang or hot-top (8), and an outlet with a vertically movable supporting device (5). A slit (10) supplies water to cool the molted metal. The wall in the mold cavity is wholly or partly constituted by a permeable material, whereby oil and/or gas are supplied through the permeable material to form an oil and/or gas layer between the metal and the wall of the mold to prevent the metal from coming into direct contact with the wall of the mold. The oil and gas are supplied separately through two independent, and, by means of a sealing element (14) or the like, physically separated rings or wall elements (12, 13). The upper wall element (12) for the supply of oil, is arranged above the area where the freezing front of the metal is located, while the lower wall element for the supply of gas is arranged directly opposite to the freezing front (19) of the metal (11) and extends from a lower part of the mold cavity and beyond the contact point between the metal and the mold wall.
Inventors
- 👤 Idar Kjetil Steen
- 👤 Bjarne Heggset
- 👤 Torstein S.ae butted.ther
- 👤 Sverre Hanaset
- 👤 Karl Venås
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:11
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/07; B22D11/04; B22D11/0401
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
222 words
A casting arrangement comprising: a casting mould having a wall defining a mould cavity, said mould cavity having an upwardly facing inlet, an outlet, and an intermediate inwardly facing insulated overhang, whereby when molten metal is cast in said casting mould, molten metal enters said inlet, goes through said intermediate inwardly facing insulated overhang and to said outlet, the molten metal having a contact point with said wall of said casting mould; a vertically movable support at said outlet for supporting the molten metal that is cast; means for supplying water into said mould cavity for cooling molten metal being cast such that a freezing front is formed in the molten metal being cast at a freezing front point in said mould cavity; an oil supply wall element forming a part of said wall of said casting mould and located above said freezing front point; a gas supply wall element forming a part of said wall of said casting mould, located below said oil supply wall element and directly opposite to said freezing front point, and extending upward to a point above said contact point of the molten metal with said wall of said casting mould, wherein said oil supply element and said gas supply element are physically separate; and means for sealing said oil supply element from said gas supply element.
Claim 2
Dependent Claim
222 words
A casting arrangement comprising: a casting mould having a wall defining a mould cavity, said mould cavity having an upwardly facing inlet, an outlet, and an intermediate inwardly facing insulated overhang, whereby when molten metal is cast in said casting mould, molten metal enters said inlet, goes through said intermediate inwardly facing insulated overhang and to said outlet, the molten metal having a contact point with said wall of said casting mould; a vertically movable support at said outlet for supporting the molten metal that is cast; means for supplying water into said mould cavity for cooling molten metal being cast such that a freezing front is formed in the molten metal being cast at a freezing front point in said mould cavity; an oil supply wall element forming a part of said wall of said casting mould and located above said freezing front point; a gas supply wall element forming a part of said wall of said casting mould, located below said oil supply wall element and directly opposite to said freezing front point, and extending upward to a point above said contact point of the molten metal with said wall of said casting mould, wherein said oil supply element and said gas supply element are physically separate; and means for sealing said oil supply element from said gas supply element.
Claim 3
Dependent Claim
29 words
The arrangement of claim 1, wherein said oil supply element comprises a material selected from the group consisting of a porous metallic material, graphite and a porous ceramic material.
Claim 4
Dependent Claim
19 words
The arrangement of claim 1, wherein said oil supply element comprises a slit filled with heat resistant fiber paper.
Claim 5
Dependent Claim
25 words
The arrangement of claim 1, wherein said gas supply element comprises a material selected from the group consisting of graphite and a porous ceramic material.
Claim 6
Dependent Claim
25 words
The arrangement of claim 2, wherein said gas supply element comprises a material selected from the group consisting of graphite and a porous ceramic material.
Claim 7
Dependent Claim
25 words
The arrangement of claim 3, wherein said gas supply element comprises a material selected from the group consisting of graphite and a porous ceramic material.
Claim 8
Dependent Claim
25 words
The arrangement of claim 1, wherein said means for sealing comprises a packing that is made of a material that is non-porous and heat resistant.
Claim 9
Dependent Claim
14 words
The arrangement of claim 1, wherein said packing is made of a metal material.
Claim 10
Dependent Claim
25 words
The arrangement of claim 1, wherein said means for sealing comprises a layer between said oil and gas supply elements that comprise an impregnating agent.
Claim 11
Dependent Claim
232 words
A casting arrangement comprising: a casting mould having a mould wall defining a mould cavity, said casting mould having an inlet to said mould cavity and an outlet from said mould cavity, and said casting mould further comprising an overhang portion between said inlet and said outlet defining a passage that is narrower than said mould cavity; a vertically movable support disposed at said outlet for supporting metal cast by said casting mould; a water channel extending through said mould wall to said mould cavity, whereby when molten metal is cast through said mould cavity, water can be supplied to said mould cavity to chill the molten metal, thus creating a freezing front of the molten metal; an oil supply element forming a part of said mould wall of said casting mould, said oil supply wall being located above a point along the mould cavity corresponding to an intended freezing front point; a gas supply element forming a part of said wall of said casting mould located below said oil supply wall element and directly opposite to the intended freezing front point, and extending upward to a point above an intended point of contact between the molten metal and said wall of said casting mould, wherein said oil supply element and said gas supply element are physically separate elements; and a seal between said oil supply element and said gas supply element.
Claim 12
Dependent Claim
232 words
A casting arrangement comprising: a casting mould having a mould wall defining a mould cavity, said casting mould having an inlet to said mould cavity and an outlet from said mould cavity, and said casting mould further comprising an overhang portion between said inlet and said outlet defining a passage that is narrower than said mould cavity; a vertically movable support disposed at said outlet for supporting metal cast by said casting mould; a water channel extending through said mould wall to said mould cavity, whereby when molten metal is cast through said mould cavity, water can be supplied to said mould cavity to chill the molten metal, thus creating a freezing front of the molten metal; an oil supply element forming a part of said mould wall of said casting mould, said oil supply wall being located above a point along the mould cavity corresponding to an intended freezing front point; a gas supply element forming a part of said wall of said casting mould located below said oil supply wall element and directly opposite to the intended freezing front point, and extending upward to a point above an intended point of contact between the molten metal and said wall of said casting mould, wherein said oil supply element and said gas supply element are physically separate elements; and a seal between said oil supply element and said gas supply element.
Claim 13
Dependent Claim
21 words
The casting arrangement of claim 10, wherein oil and gas supply channels extend to said oil and gas supply elements, respectively.
Claim 14
Dependent Claim
21 words
The casting arrangement of claim 10, wherein at least one of said oil and gas supply elements comprises an annular member.
Claim 15
Dependent Claim
28 words
The casting arrangement of claim 10, wherein said overhang portion is defined by a refractory member disposed at said inlet, said refractory member abutting said oil supply element.
Claim 16
Dependent Claim
31 words
The casting arrangement of claim 10, wherein said oil supply wall element comprises a material selected from the group consisting of a porous metallic material, graphite and a porous ceramic material.
Claim 17
Dependent Claim
19 words
The arrangement of claim 10, wherein said oil supply element comprises a slit filled with heat resistant fiber paper.
Claim 18
Dependent Claim
25 words
The arrangement of claim 10, wherein said gas supply element comprises a material selected from the group consisting of graphite and a porous ceramic material.
Claim 19
Dependent Claim
23 words
The arrangement of claim 10, wherein said seal comprises a packing that is made of a material that is non-porous and heat resistant.
Claim 20
Dependent Claim
14 words
The arrangement of claim 17, wherein said packing is made of a metal material.
Claim 21
Dependent Claim
23 words
The arrangement of claim 10, wherein said seal comprises a layer between said oil and gas supply elements that comprises an impregnating agent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-10-20 | 2001-04-21 | 2001-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-20 | 2005-04-21 | 2005-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-20 | 2009-04-21 | 2009-10-21 | $7700.00 | Window Closed / Lapsed |