CA2141261A1 - Casting chill mould - Google Patents
Casting chill mouldInfo
- Publication number
- CA2141261A1 CA2141261A1 CA 2141261 CA2141261A CA2141261A1 CA 2141261 A1 CA2141261 A1 CA 2141261A1 CA 2141261 CA2141261 CA 2141261 CA 2141261 A CA2141261 A CA 2141261A CA 2141261 A1 CA2141261 A1 CA 2141261A1
- Authority
- CA
- Canada
- Prior art keywords
- chill mould
- melt
- mould
- wall elements
- chill
- Prior art date
- 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.)
- Abandoned
Links
- 238000005266 casting Methods 0.000 title description 11
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 238000009749 continuous casting Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims 1
- 230000001939 inductive effect Effects 0.000 abstract description 7
- 239000000155 melt Substances 0.000 description 18
- 230000000694 effects Effects 0.000 description 8
- 230000006698 induction Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 5
- 238000012216 screening Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000161 steel melt Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241001296096 Probles Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
A chill mould for a metal melt, formed by electrically conductive wall elements (2, 3) enclosing the metal melt, enables the metal melt to be subjected to effective inductive stirring at low energy cost by the feature that each wall element (2, 3) is electrically insulated from the adjoining wall elements (2, 3).
The single Figure is intended for the Abstract.
The single Figure is intended for the Abstract.
Description
~1~1261 WE/wa 93165C~
23.01.1995 CASTING CHILL MOULD
The invention relates to a casting chill mould for metal melts, which is formed by electrically conductive wall elements enclosing the metal melt.
Such casting chill moulds are used, for example, in the continuous casting of steel. The melt solidifies in the chill mould, while at the same time the solidified steel is continuously drawn off from the chill mould. The formation of structure during solidification can be positively influenced by subjecting the melt to an inductive stirring process. To this end the melt is exposed to a magnetic field which changes in time and space, via which a magnetic rotary field is generated in the melt. This exerts on the melt a torque via which the melt is "stirred".
The operation of such inductive stirrers is comparable with the operation of an asynchronous motor. The interconnected values (magnetic field and electric current) determining the torque generated and transmitted by a transformer in accordance with the law of induction are transmitted in a contactless manner via a magnetic rotary field through the chill mould enclosing the melt to the liquid metal.
One proble~ of inductive stirring is that the magnetic rotary field generated by the stirring device acts not only on the melt, but also on all other metal members disposed in its range of 2141~61 action. The consequence is that at first only the chill mould enclosing the melt is subjected to the full effect of the magnetic induction. Since due to its electric conductivity the chill mould forms a closed conductor circuit, as soon as the chill mould is exposed to a magnetic rotary field, an induction current flows in the mould and again produces a magnetic field.
This second opposing magnetic field, directed oppositely to the primary magnetic field generated by the stirring device, partially cancels out the effect of the primary field, so that finally only a fraction of the magnetic induction originally generated operates in the metal melt. The casting mould enclosing the melt therefore screens the melt against the required action of the magnetic field generated by the device.
The screening effect of the chill mould is particularly heavy in the stirring of a steel melt during the continuous casting of steel, since the chill mould used in continuous casting is generally made of copper and has a particularly high conductivity.
It is known that the screening effect of the chill mould depends mainly on the frequency of the rotary field, the geometry of the chill mould and the electric conductivity of the material of the chill mould. Since the two last-mentioned values as a rule are fixed, in practice attempts are made to increase the depth of penetration of the magnetic rotary field by reducing its frequency, thereby lessening the screening effect of the chill mould. However, the disadvantage of that step is that a reduction in the frequency of the rotary field also reduces the - ~141261 required movement in the melt. The consequence is, for example, a reduction in the quality improvement of the steel thus treated.
Another possibility is to increase the strength of the magnetic field, but this involves a high energy cost and the accompanying high operating costs.
It is an object of the invention to provide a chill mould which enables the metal melt to be effectively stirred by induction at a low energy cost.
This problem is solved according to the invention by the feature that each wall element is electrically insulated from the adjoining wall elements. In this way the chill mould enclosing the melt no longer forms a closed conductor, so that in the device according to the invention induction current can no longer flow in the chill mould. In contrast with the prior art, this feature results in a considerable reduction of the opposing magnetic field generated in the chill mould, so that when the chill mould according to the invention is used in an inductive stirring device, apart from small losses, the primary magnetic field generated by the stirring device acts with its full power directly on the melt.
Since the chill mould now has substantially no influence on the effect of the primary magnetic field, the frequency and therefore the speed of rotation of the rotary field generated by the stirring device can be increased without the risk of additional losses. As a result, the effectiveness of the inductive stirring is enhanced.
Moreover, as a result of the reduced losses, the energy required for a stirring device equipped with the casting chill mould according to the invention is less than that required by conventionally equipped devices. As a result, transformers and frequency converters which are of lower power and therefore cheap can be used for supplying the device operated in conjunction with the chill mould according to the invention, while the geometry of the mould remains unchanged. In a precisely similar manner, the cross-sections of the cables used can be reduced due to the low electric power required, the result being a reduced requirement for material and therefore a saving in costs. The reduction of the power density in the stirring coil of the stirring device accompanying a reduction in the electric power required also has positive effects on the device's service life.
On the other hand, due to the low screening effect of the casting chill mould, its wall thicknesses can be increased while the power of the stirring device remains unchanged. This results in a lengthening of the service life of the casting chill mould.
Lastly, with an inductive stirrer operated in conjunction with the casting chill mould according to the invention it is no longer necessary to adapt the stirring current to the state of wear of the wall elements, since the thickness of the wall elements of the mould no longer influence their screening effect.
In this way it is possible to obviate errors caused in the prior art by a delayed readjustment of the magnetic field generated by the stirrer. This produces appreciable advantages in securing a constant satisfactory quality of the melt treated.
- ~141261 The chill mould according to the invention is more particularly suitable for use as a continuous casting chill mould.
An embodiment of the invention shown in the drawing will now be explained in greater detail.
The drawing shows in perspective a water-cooled casting chill mould 1 for the continuous casting of steel. The mould is enclosed by a stirrer generating an electromagnetic field acting on the melt. The chill casting mould is formed by four positively assembled plate-shaped wall elements 2 which enclose the steel melt cast into the chill mould. The wall elements 2, 3 are insulated electrically from one another by insulating paper 4 which is inserted in joints 5 between the wall elements 2. This prevents the occurrence of an opposing field to the primary magnetic field generated by the stirrer. The primary magnetic field can therefore act with substantially full strength on the melt during its solidification.
23.01.1995 CASTING CHILL MOULD
The invention relates to a casting chill mould for metal melts, which is formed by electrically conductive wall elements enclosing the metal melt.
Such casting chill moulds are used, for example, in the continuous casting of steel. The melt solidifies in the chill mould, while at the same time the solidified steel is continuously drawn off from the chill mould. The formation of structure during solidification can be positively influenced by subjecting the melt to an inductive stirring process. To this end the melt is exposed to a magnetic field which changes in time and space, via which a magnetic rotary field is generated in the melt. This exerts on the melt a torque via which the melt is "stirred".
The operation of such inductive stirrers is comparable with the operation of an asynchronous motor. The interconnected values (magnetic field and electric current) determining the torque generated and transmitted by a transformer in accordance with the law of induction are transmitted in a contactless manner via a magnetic rotary field through the chill mould enclosing the melt to the liquid metal.
One proble~ of inductive stirring is that the magnetic rotary field generated by the stirring device acts not only on the melt, but also on all other metal members disposed in its range of 2141~61 action. The consequence is that at first only the chill mould enclosing the melt is subjected to the full effect of the magnetic induction. Since due to its electric conductivity the chill mould forms a closed conductor circuit, as soon as the chill mould is exposed to a magnetic rotary field, an induction current flows in the mould and again produces a magnetic field.
This second opposing magnetic field, directed oppositely to the primary magnetic field generated by the stirring device, partially cancels out the effect of the primary field, so that finally only a fraction of the magnetic induction originally generated operates in the metal melt. The casting mould enclosing the melt therefore screens the melt against the required action of the magnetic field generated by the device.
The screening effect of the chill mould is particularly heavy in the stirring of a steel melt during the continuous casting of steel, since the chill mould used in continuous casting is generally made of copper and has a particularly high conductivity.
It is known that the screening effect of the chill mould depends mainly on the frequency of the rotary field, the geometry of the chill mould and the electric conductivity of the material of the chill mould. Since the two last-mentioned values as a rule are fixed, in practice attempts are made to increase the depth of penetration of the magnetic rotary field by reducing its frequency, thereby lessening the screening effect of the chill mould. However, the disadvantage of that step is that a reduction in the frequency of the rotary field also reduces the - ~141261 required movement in the melt. The consequence is, for example, a reduction in the quality improvement of the steel thus treated.
Another possibility is to increase the strength of the magnetic field, but this involves a high energy cost and the accompanying high operating costs.
It is an object of the invention to provide a chill mould which enables the metal melt to be effectively stirred by induction at a low energy cost.
This problem is solved according to the invention by the feature that each wall element is electrically insulated from the adjoining wall elements. In this way the chill mould enclosing the melt no longer forms a closed conductor, so that in the device according to the invention induction current can no longer flow in the chill mould. In contrast with the prior art, this feature results in a considerable reduction of the opposing magnetic field generated in the chill mould, so that when the chill mould according to the invention is used in an inductive stirring device, apart from small losses, the primary magnetic field generated by the stirring device acts with its full power directly on the melt.
Since the chill mould now has substantially no influence on the effect of the primary magnetic field, the frequency and therefore the speed of rotation of the rotary field generated by the stirring device can be increased without the risk of additional losses. As a result, the effectiveness of the inductive stirring is enhanced.
Moreover, as a result of the reduced losses, the energy required for a stirring device equipped with the casting chill mould according to the invention is less than that required by conventionally equipped devices. As a result, transformers and frequency converters which are of lower power and therefore cheap can be used for supplying the device operated in conjunction with the chill mould according to the invention, while the geometry of the mould remains unchanged. In a precisely similar manner, the cross-sections of the cables used can be reduced due to the low electric power required, the result being a reduced requirement for material and therefore a saving in costs. The reduction of the power density in the stirring coil of the stirring device accompanying a reduction in the electric power required also has positive effects on the device's service life.
On the other hand, due to the low screening effect of the casting chill mould, its wall thicknesses can be increased while the power of the stirring device remains unchanged. This results in a lengthening of the service life of the casting chill mould.
Lastly, with an inductive stirrer operated in conjunction with the casting chill mould according to the invention it is no longer necessary to adapt the stirring current to the state of wear of the wall elements, since the thickness of the wall elements of the mould no longer influence their screening effect.
In this way it is possible to obviate errors caused in the prior art by a delayed readjustment of the magnetic field generated by the stirrer. This produces appreciable advantages in securing a constant satisfactory quality of the melt treated.
- ~141261 The chill mould according to the invention is more particularly suitable for use as a continuous casting chill mould.
An embodiment of the invention shown in the drawing will now be explained in greater detail.
The drawing shows in perspective a water-cooled casting chill mould 1 for the continuous casting of steel. The mould is enclosed by a stirrer generating an electromagnetic field acting on the melt. The chill casting mould is formed by four positively assembled plate-shaped wall elements 2 which enclose the steel melt cast into the chill mould. The wall elements 2, 3 are insulated electrically from one another by insulating paper 4 which is inserted in joints 5 between the wall elements 2. This prevents the occurrence of an opposing field to the primary magnetic field generated by the stirrer. The primary magnetic field can therefore act with substantially full strength on the melt during its solidification.
Claims (3)
1. A chill mould for a metal melt, which is formed by electrically conductive wall elements (2, 3) enclosing the metal melt, characterized in that each wall element (2) is electrically insulated from the adjoining wall elements (3).
2. A chill mould according to claim 1, characterized in that the insulation between the wall elements (2, 3) is formed by insulating paper (4) laid between the wall elements (2, 3).
3. Use of the chill mould according to claims 1 or 2 as a continuous casting chill mould in conjunction with electromagnetic stirring in the continuous casting of steel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4402500.9-24 | 1994-01-28 | ||
| DE19944402500 DE4402500C2 (en) | 1994-01-28 | 1994-01-28 | Casting mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2141261A1 true CA2141261A1 (en) | 1995-07-29 |
Family
ID=6508880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2141261 Abandoned CA2141261A1 (en) | 1994-01-28 | 1995-01-27 | Casting chill mould |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0665073A3 (en) |
| CA (1) | CA2141261A1 (en) |
| DE (1) | DE4402500C2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI117746B (en) * | 2002-01-09 | 2007-02-15 | Borealis Tech Oy | Container |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1146622B (en) * | 1953-09-21 | 1963-04-04 | Ver Leichtmetallwerke Gmbh | Continuous casting mold |
| DE2800458C3 (en) * | 1978-01-05 | 1981-10-01 | Gecelev, Zinovij Naumovič, Kujbyšev | Electromagnetic continuous casting mold |
| FR2595596B1 (en) * | 1986-03-13 | 1988-04-29 | Cegedur | LINGOTIERE FOR ADJUSTING THE NEXT LEVEL IN WHICH IT IS IN CONTACT WITH THE FREE METAL SURFACE IN A VERTICAL CAST |
| SE501935C2 (en) * | 1993-11-10 | 1995-06-26 | Asea Brown Boveri | Method and apparatus for slowing down the movement of a molten casting mold |
-
1994
- 1994-01-28 DE DE19944402500 patent/DE4402500C2/en not_active Expired - Fee Related
-
1995
- 1995-01-24 EP EP95100881A patent/EP0665073A3/en not_active Withdrawn
- 1995-01-27 CA CA 2141261 patent/CA2141261A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP0665073A3 (en) | 1997-01-29 |
| DE4402500C2 (en) | 1995-12-21 |
| DE4402500A1 (en) | 1995-08-03 |
| EP0665073A2 (en) | 1995-08-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |