CA2257427C - Casting nozzle for thin strip casting plants - Google Patents
Casting nozzle for thin strip casting plants Download PDFInfo
- Publication number
- CA2257427C CA2257427C CA002257427A CA2257427A CA2257427C CA 2257427 C CA2257427 C CA 2257427C CA 002257427 A CA002257427 A CA 002257427A CA 2257427 A CA2257427 A CA 2257427A CA 2257427 C CA2257427 C CA 2257427C
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- CA
- Canada
- Prior art keywords
- casting
- dam
- carrier
- nozzle
- thin strip
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The invention is directed to a nozzle for thin strip casting plants, especially for steel strip. In casting plants of this type, the liquid steel must be applied on a carrier from the nozzle forming a casting gap.
The nozzle comprises a nozzle for a thin strip casting plant, comprising: a carrier for thin strip, the carrier being movable in a conveying direction; a back dam which rests on the carrier; a front dam arranged to define a casting gap toward the carrier in the conveying direction; a first primary inductor and a first secondary inductor arranged on the back dam; and a second primary inductor and a second secondary inductor arranged on the front dam, the secondary inductors being water cooled and arranged to project into a region of the casting gap.
The nozzle comprises a nozzle for a thin strip casting plant, comprising: a carrier for thin strip, the carrier being movable in a conveying direction; a back dam which rests on the carrier; a front dam arranged to define a casting gap toward the carrier in the conveying direction; a first primary inductor and a first secondary inductor arranged on the back dam; and a second primary inductor and a second secondary inductor arranged on the front dam, the secondary inductors being water cooled and arranged to project into a region of the casting gap.
Description
CASTING NOZZLE FOR THIN STRIP CASTING PLANTS
Description The invention is directed to a casting nozzle for thin strip casting plants, especially for casting thin steel strip.
DE 37 07 897 discloses a nozzle for casting thin steel strip in which the nozzle forms a back dam which adjoins a movable carrier and a front dam, wherein a casting gap is defined toward the carrier between the back dam and front dam.
Nozzles of the type mentioned above are usually made from refractory material which is subjected to a certain degree of wear at high temperatures of the steel melt, so that the shape of the casting gap can change during casting; however, the nozzle must be exchanged in any case after a certain period of use.
It was the object of the invention to provide an improved nozzle construction in which wear is minimized and in which the melt can be heated in the region of the casting gap.
According to the invention, there is provided a nozzle for a thin strip casting plant, comprising: a carrier for thin strip, the carrier being movable in a conveying direction; a back dam which rests on the carrier;
a front dam arranged to define a casting gap toward the carrier in the conveying direction; a first primary inductor and a first secondary inductor arranged on the back dam; and a second primary inductor and a second secondary inductor arranged on the front dam, the secondary inductors being la water cooled and arranged to project into a region of the casting gap.
Through the use of a primary inductor and a secondary inductor as separate component parts for generating an electromagnetic field which extends into the region of the melt, the melt is prevented on the one hand from reaching the wall of the primary inductor which would lead to electrical short circuiting. On the other hand, an eddy current field can be induced in the melt itself by means of the currents induced in the secondary inductor, so that it is made possible to heat the melt in the region of the outlet or pouring opening. In this way, the pouring opening can be protected from changes caused by deposits of solidified melt. Further, the electromagnetic forces in the melt lead to a displacement of the melt from the secondary inductor which also helps to prevent deposits. The above-described principle is used in the known cold crucible technique to melt metals in water-cooled crucibles.
According to a preferred construction, a secondary inductor is formed of a plurality of portions which are electrically insulated from one another.
Accordingly, every portion acts as an independent secondary inductor.
According to another preferred construction, a plurality of outlet openings for the melt which are arranged adjacent to one another in the width direction of the thin strip are formed between the back dam and front dam.
This results in a more uniform distribution of the melt over the width of the casting gap (thin strip width). The formation of outlet openings is achieved by a corresponding shaping of the back dam in the conveying direction or by a corresponding shaping of the front dam in the direction opposite to the conveying direction.
According to a further preferred construction, a secondary inductor is constructed in the back dam from a plurality of insulated portions, each of which has an inlet and outlet for cooling water, wherein the individual portions are constructed in a dovetail-shaped or arrow-shaped or straight manner for forming the outlet openings for the melt. In particular, a flow directing plate is provided in the interior of the portions, so that a positive guidance is achieved between the inlet and outlet at the end of the portions directed opposite to the casting gap up to the head area of the portions which faces the casting gap.
According to another preferred construction, electrically insulated portions of a secondary inductor with an inlet and outlet for cooling water are arranged in the region of the front dam, wherein the portions are dovetail-shaped or arrow-shaped or straight in the head region of the portions, namely, where the front dam adjoins the casting gap to form outlet openings.
Description The invention is directed to a casting nozzle for thin strip casting plants, especially for casting thin steel strip.
DE 37 07 897 discloses a nozzle for casting thin steel strip in which the nozzle forms a back dam which adjoins a movable carrier and a front dam, wherein a casting gap is defined toward the carrier between the back dam and front dam.
Nozzles of the type mentioned above are usually made from refractory material which is subjected to a certain degree of wear at high temperatures of the steel melt, so that the shape of the casting gap can change during casting; however, the nozzle must be exchanged in any case after a certain period of use.
It was the object of the invention to provide an improved nozzle construction in which wear is minimized and in which the melt can be heated in the region of the casting gap.
According to the invention, there is provided a nozzle for a thin strip casting plant, comprising: a carrier for thin strip, the carrier being movable in a conveying direction; a back dam which rests on the carrier;
a front dam arranged to define a casting gap toward the carrier in the conveying direction; a first primary inductor and a first secondary inductor arranged on the back dam; and a second primary inductor and a second secondary inductor arranged on the front dam, the secondary inductors being la water cooled and arranged to project into a region of the casting gap.
Through the use of a primary inductor and a secondary inductor as separate component parts for generating an electromagnetic field which extends into the region of the melt, the melt is prevented on the one hand from reaching the wall of the primary inductor which would lead to electrical short circuiting. On the other hand, an eddy current field can be induced in the melt itself by means of the currents induced in the secondary inductor, so that it is made possible to heat the melt in the region of the outlet or pouring opening. In this way, the pouring opening can be protected from changes caused by deposits of solidified melt. Further, the electromagnetic forces in the melt lead to a displacement of the melt from the secondary inductor which also helps to prevent deposits. The above-described principle is used in the known cold crucible technique to melt metals in water-cooled crucibles.
According to a preferred construction, a secondary inductor is formed of a plurality of portions which are electrically insulated from one another.
Accordingly, every portion acts as an independent secondary inductor.
According to another preferred construction, a plurality of outlet openings for the melt which are arranged adjacent to one another in the width direction of the thin strip are formed between the back dam and front dam.
This results in a more uniform distribution of the melt over the width of the casting gap (thin strip width). The formation of outlet openings is achieved by a corresponding shaping of the back dam in the conveying direction or by a corresponding shaping of the front dam in the direction opposite to the conveying direction.
According to a further preferred construction, a secondary inductor is constructed in the back dam from a plurality of insulated portions, each of which has an inlet and outlet for cooling water, wherein the individual portions are constructed in a dovetail-shaped or arrow-shaped or straight manner for forming the outlet openings for the melt. In particular, a flow directing plate is provided in the interior of the portions, so that a positive guidance is achieved between the inlet and outlet at the end of the portions directed opposite to the casting gap up to the head area of the portions which faces the casting gap.
According to another preferred construction, electrically insulated portions of a secondary inductor with an inlet and outlet for cooling water are arranged in the region of the front dam, wherein the portions are dovetail-shaped or arrow-shaped or straight in the head region of the portions, namely, where the front dam adjoins the casting gap to form outlet openings.
It is understood that reference to the dovetail shape or arrow shape of the front dam or back dam in the area of the outlet openings also comprehends every other shape, especially also semi-circular shapes, etc. Also included is a corresponding shaping of the front dam or back dam, e.g., circular outlet openings can also be formed.
The portions in the front dam which are insulated with respect to one another preferably also have, in their interior, flow directing plates between the inlet and outlet.
An embodiment example of a nozzle for thin strip casting plants will be shown schematically with reference to the drawings.
Figure 1 shows a vertical section through a nozzle, wherein, in the region of the back dam 2, the secondary inductor 22 is formed of individual portions with dovetail-shaped ends. The section lies through the center of the dovetail 23. The back dam 2 is fitted to a carrier 1, especially an endless strip revolving around rollers.
The casting gap 4 is formed between the back dam 2 and the front dam 3. A
primary inductor 21 adjoins the secondary inductor 22. In the free area between the dovetail 23 and front dam 3, the liquid steel can flow out of the backup area 5 into the solidification area 6 through the flow direction indicated by arrow 7. A flow directing plate 24 is arranged in portion 22. The secondary inductor 22 is covered by refractory material 25 toward the backup area 5. The inductors 22, 23 are water-cooled and are preferably made of copper. The primary inductor 21 is supplied with high frequency.
In the version shown in Figure 2, the front dam 3 is formed by a plurality of secondary inductors 32 which are electrically insulated from one another and in which a primary inductor 31 induces an electrical current. The primary inductor 31 and secondary inductor 32 are cooled by water and the primary inductor 31 is supplied with high frequency. The secondary inductor 32 extends to the tip of the dovetail of the secondary inductor 22.
The portions in the front dam which are insulated with respect to one another preferably also have, in their interior, flow directing plates between the inlet and outlet.
An embodiment example of a nozzle for thin strip casting plants will be shown schematically with reference to the drawings.
Figure 1 shows a vertical section through a nozzle, wherein, in the region of the back dam 2, the secondary inductor 22 is formed of individual portions with dovetail-shaped ends. The section lies through the center of the dovetail 23. The back dam 2 is fitted to a carrier 1, especially an endless strip revolving around rollers.
The casting gap 4 is formed between the back dam 2 and the front dam 3. A
primary inductor 21 adjoins the secondary inductor 22. In the free area between the dovetail 23 and front dam 3, the liquid steel can flow out of the backup area 5 into the solidification area 6 through the flow direction indicated by arrow 7. A flow directing plate 24 is arranged in portion 22. The secondary inductor 22 is covered by refractory material 25 toward the backup area 5. The inductors 22, 23 are water-cooled and are preferably made of copper. The primary inductor 21 is supplied with high frequency.
In the version shown in Figure 2, the front dam 3 is formed by a plurality of secondary inductors 32 which are electrically insulated from one another and in which a primary inductor 31 induces an electrical current. The primary inductor 31 and secondary inductor 32 are cooled by water and the primary inductor 31 is supplied with high frequency. The secondary inductor 32 extends to the tip of the dovetail of the secondary inductor 22.
Claims (4)
1. A nozzle for a thin strip casting plant, comprising:
a carrier for thin strip, the carrier being movable in a conveying direction;
a back dam which rests on the carrier;
a front dam arranged to define a casting gap toward the carrier in the conveying direction;
a first primary inductor and a first secondary inductor arranged on the back dam; and a second primary inductor and a second secondary inductor arranged on the front dam, the secondary inductors being water cooled and arranged to project into a region of the casting gap.
a carrier for thin strip, the carrier being movable in a conveying direction;
a back dam which rests on the carrier;
a front dam arranged to define a casting gap toward the carrier in the conveying direction;
a first primary inductor and a first secondary inductor arranged on the back dam; and a second primary inductor and a second secondary inductor arranged on the front dam, the secondary inductors being water cooled and arranged to project into a region of the casting gap.
2. A nozzle according to claim 1, wherein the secondary inductors are formed of a plurality of portions which are electrically insulated from one another and wherein each of the portions has an inlet and an outlet for cooling water.
3. A nozzle according to claim 1, wherein the back dam and the front dam are configured and arranged to form between them a plurality of outlet openings that are adjacent to one another in a width direction of the thin strip.
4. A nozzle according to claim 3, wherein the secondary inductors are formed of electrically insulated portions with inlets and outlets for cooling water, and wherein the portions have a shape selected from a group consisting of dovetail-shaped, arrow shaped and straight so as to form the outlet openings.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19622924.3 | 1996-06-07 | ||
| DE19622924 | 1996-06-07 | ||
| DE19636697.6 | 1996-09-10 | ||
| DE19636697A DE19636697C1 (en) | 1996-06-07 | 1996-09-10 | Casting nozzle used in plant for continuous casting of thin steel bands |
| PCT/DE1997/001151 WO1997047412A1 (en) | 1996-06-07 | 1997-06-03 | Casting nozzle for thin strip casting plants |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2257427A1 CA2257427A1 (en) | 1997-12-18 |
| CA2257427C true CA2257427C (en) | 2006-02-14 |
Family
ID=35892354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002257427A Expired - Lifetime CA2257427C (en) | 1996-06-07 | 1997-06-03 | Casting nozzle for thin strip casting plants |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2257427C (en) |
-
1997
- 1997-06-03 CA CA002257427A patent/CA2257427C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2257427A1 (en) | 1997-12-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20170605 |