CA2088075A1 - Electromagnetic continuous chill casting mould - Google Patents
Electromagnetic continuous chill casting mouldInfo
- Publication number
- CA2088075A1 CA2088075A1 CA002088075A CA2088075A CA2088075A1 CA 2088075 A1 CA2088075 A1 CA 2088075A1 CA 002088075 A CA002088075 A CA 002088075A CA 2088075 A CA2088075 A CA 2088075A CA 2088075 A1 CA2088075 A1 CA 2088075A1
- Authority
- CA
- Canada
- Prior art keywords
- shield
- bar
- inductor
- chill
- section
- 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
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
- B22D11/01—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces
- B22D11/015—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces using magnetic field for conformation, i.e. the metal is not in contact with a mould
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Abstract In an electromagnetic continuous chill casting mould (10) for vertically casting bars or billets, with an inductor (18), an internally cooled electromagnetic shield (24) and a cooling device (12, 34) with a coolant outlet opening (26, 36) directed onto the surface of the bar (32), the tubular shield (24) has a round or oval cross-section, wherein in case of an oval cross-section the large diameter (d1) thereof lies parallel to the longitudinal axis (x) of the bar and the ratio of large (d1) to small (d2) diameter is 1:1 to 3:1.
The shield of round or oval cross-section is easy and cheap to make and subject to hardly any plastic deformation in operation, so that even after prolonged casting operation, no elaborate straightening operations are necessary.
(Fig. 1)
The shield of round or oval cross-section is easy and cheap to make and subject to hardly any plastic deformation in operation, so that even after prolonged casting operation, no elaborate straightening operations are necessary.
(Fig. 1)
Description
2 ~ 8 8 0 r~
The invention concerns an electromagnetic continuous chill casting mould for vertically casting bars or billets, with an inductor, an internally cooled electromagnetic shield and a cooling device with a coolant outlet opening directed onto the surface of the bar.
It is known from US-A-3 985 179 that in electromagnet-ic continuous chill casting moulds the electromagnetic shield can be provided with a cooling system independent of the bar cooling system. Hence it is possible to adjust the shield in height in relation to the position of the inductor without simultaneously altering the line or surface of coolant impingement.
The shield serves to weaken the electromagnetic field and hence reduce the electromagnetic force in the upper region of the inductor directed towards the interior of the bar at the bar surface, to maintain equilibrium with the metallostatic pressure of the liquid bar portion, which decreases upwardly. In practice, as vertical as possible a position of the surface of the liquid bar portion and also as small as possible a meniscus radius at the transition from the vertical bar surface to the horizontal metal bath level in the chill mould is to be ensured in this way. The outer form of the shield usually has in cross-section the shape of a triangle with the apex pointing downwardly and the thickness increasing upwardly.
The designs of electromagnetic shields known from the state of the art are fraught with the disadvantage that they are plastically deformed after a certain number of castings and have to be restraightened each time.
In view of the circumstances, the inventors set themselves the aim of improving an electromagnetic chill mould of the kind mentioned hereinbefore in such a way that, while maintaining proven chill mould frame and inductor configurations, the electromagnetic shield is easier and cheaper to make as well as less maintenance-intensive.
The object is achieved according to the invention by 7.~
the fact that the shield is tubular with a round or oval cross-section, wherein in case of an oval cross-section the large diameter thereof lies parallel to the longitudinal axis of the bar and the ratio of large to small diameter is 1:1 to 3:1, preferably not more than 2:1.
The cross-sectional shape of the shield according to the invention was calculated on the basis of calculations with a simulation model of a casting apparatus, wherein maintenance of the meniscus shape arising with proven configurations of electromagnetic chill moulds as well as of the velocity ield in the liquid bar portion was established as a boundary condition.
For fine adjustment of shielding of the electro-magnetic field in the upper region of the inductor, the shield appropriately can be adjusted in height parallel to the longitudinal axis of the bar in relation to the position of the inductor. Here, the shield is preferably arranged at least partially inside a guide panel of electrically insulating material which is a poor heat conductor.
In a first possible arrangement of the coolant outlet opening of the cooling device, this is arranged above the shield and directed onto a coolant guide surface of a mould body arranged on the side of the shield facing away from the bar. The coolant jet is here directed through between the inductor and shield onto the bar surface, wherein for fine adjustment of the line or surface of coolant impinge-ment on the bar surface the mould body with the coolant guide surface can be adjusted in height in relation to the position of the inductor.
In a second possible arrangement of the coolant outlet opening of the cooling device, this is arranged below the shield and in general also below the inductor.
Further advantages, characteristics and details of the invention follow from the description below of preferred embodiments as well as with reference to the drawings.
These show:
, 2o~g(~r~3 ig. 1: a schematised cross-section through a chill mould; ig. 2: a schematised cross-section through another embodiment of a chill mould.
A chill mould 10 comprises according to Fig. 1 a coolant box 12 for a coolant 14. A cooled inductor 18 is fixed to the c.oolant box 12 by an intermediate layer 16 of electrically insulating material. On a supporting body 20 attached to the coolant box 12 is mounted a guide panel 22 of electrically insulating material which is a poor heat conductor, which is slidable in a vertical direction and in which is inserted a tubular shield 24 of oval cross-section. This shield 24 which is internally cooled with a through-flowing coolant can for example be made of copper or brass with a large outside diameter d1 in a vertical direction of 18 mm, a small out ide diameter d2 in a horizontal direction of 10 mm, as well as a wall thickness of l mm.
The coolant box 12 comprises a coolant outlet opening 26 which is located above the shield 24 and which is directed onto a coolant guide surface 28 of a mould body 30 which is adjustable in height also in relation to the inductor 18, but independently of the guide panel 22. The coolant 14 leaving the coolant outlet opening 26 is guided over the coolant guide surface 28 onto the surface of the bar 32.
In the design according to Fig. 2, the guide panel 22 with the integrated shield 24 is attached to the supporting body 20 so as to be adjustable in height. The guide panel 22 extends vertically downwards over the inductor 18 and thus simultaneously serves as a heat shield 22a. Cooling of the bar takes place here below the inductor 18 via nozzles 34 with nozzle opening 36 arranged around the bar 32, in which the coolant is atomised to a spray mist 38 and directed onto the bar surface.
The invention concerns an electromagnetic continuous chill casting mould for vertically casting bars or billets, with an inductor, an internally cooled electromagnetic shield and a cooling device with a coolant outlet opening directed onto the surface of the bar.
It is known from US-A-3 985 179 that in electromagnet-ic continuous chill casting moulds the electromagnetic shield can be provided with a cooling system independent of the bar cooling system. Hence it is possible to adjust the shield in height in relation to the position of the inductor without simultaneously altering the line or surface of coolant impingement.
The shield serves to weaken the electromagnetic field and hence reduce the electromagnetic force in the upper region of the inductor directed towards the interior of the bar at the bar surface, to maintain equilibrium with the metallostatic pressure of the liquid bar portion, which decreases upwardly. In practice, as vertical as possible a position of the surface of the liquid bar portion and also as small as possible a meniscus radius at the transition from the vertical bar surface to the horizontal metal bath level in the chill mould is to be ensured in this way. The outer form of the shield usually has in cross-section the shape of a triangle with the apex pointing downwardly and the thickness increasing upwardly.
The designs of electromagnetic shields known from the state of the art are fraught with the disadvantage that they are plastically deformed after a certain number of castings and have to be restraightened each time.
In view of the circumstances, the inventors set themselves the aim of improving an electromagnetic chill mould of the kind mentioned hereinbefore in such a way that, while maintaining proven chill mould frame and inductor configurations, the electromagnetic shield is easier and cheaper to make as well as less maintenance-intensive.
The object is achieved according to the invention by 7.~
the fact that the shield is tubular with a round or oval cross-section, wherein in case of an oval cross-section the large diameter thereof lies parallel to the longitudinal axis of the bar and the ratio of large to small diameter is 1:1 to 3:1, preferably not more than 2:1.
The cross-sectional shape of the shield according to the invention was calculated on the basis of calculations with a simulation model of a casting apparatus, wherein maintenance of the meniscus shape arising with proven configurations of electromagnetic chill moulds as well as of the velocity ield in the liquid bar portion was established as a boundary condition.
For fine adjustment of shielding of the electro-magnetic field in the upper region of the inductor, the shield appropriately can be adjusted in height parallel to the longitudinal axis of the bar in relation to the position of the inductor. Here, the shield is preferably arranged at least partially inside a guide panel of electrically insulating material which is a poor heat conductor.
In a first possible arrangement of the coolant outlet opening of the cooling device, this is arranged above the shield and directed onto a coolant guide surface of a mould body arranged on the side of the shield facing away from the bar. The coolant jet is here directed through between the inductor and shield onto the bar surface, wherein for fine adjustment of the line or surface of coolant impinge-ment on the bar surface the mould body with the coolant guide surface can be adjusted in height in relation to the position of the inductor.
In a second possible arrangement of the coolant outlet opening of the cooling device, this is arranged below the shield and in general also below the inductor.
Further advantages, characteristics and details of the invention follow from the description below of preferred embodiments as well as with reference to the drawings.
These show:
, 2o~g(~r~3 ig. 1: a schematised cross-section through a chill mould; ig. 2: a schematised cross-section through another embodiment of a chill mould.
A chill mould 10 comprises according to Fig. 1 a coolant box 12 for a coolant 14. A cooled inductor 18 is fixed to the c.oolant box 12 by an intermediate layer 16 of electrically insulating material. On a supporting body 20 attached to the coolant box 12 is mounted a guide panel 22 of electrically insulating material which is a poor heat conductor, which is slidable in a vertical direction and in which is inserted a tubular shield 24 of oval cross-section. This shield 24 which is internally cooled with a through-flowing coolant can for example be made of copper or brass with a large outside diameter d1 in a vertical direction of 18 mm, a small out ide diameter d2 in a horizontal direction of 10 mm, as well as a wall thickness of l mm.
The coolant box 12 comprises a coolant outlet opening 26 which is located above the shield 24 and which is directed onto a coolant guide surface 28 of a mould body 30 which is adjustable in height also in relation to the inductor 18, but independently of the guide panel 22. The coolant 14 leaving the coolant outlet opening 26 is guided over the coolant guide surface 28 onto the surface of the bar 32.
In the design according to Fig. 2, the guide panel 22 with the integrated shield 24 is attached to the supporting body 20 so as to be adjustable in height. The guide panel 22 extends vertically downwards over the inductor 18 and thus simultaneously serves as a heat shield 22a. Cooling of the bar takes place here below the inductor 18 via nozzles 34 with nozzle opening 36 arranged around the bar 32, in which the coolant is atomised to a spray mist 38 and directed onto the bar surface.
Claims (7)
1. Electromagnetic continuous chill casting mould for vertically casting bars or billets, with an inductor (18), an internally cooled electromagnetic shield (24) and a cooling device (12, 34) with a coolant outlet opening (26, 36) directed onto the surface of the bar (32), character-ised in that the shield (24) is tubular with a round or oval cross-section, wherein in case of an oval cross-section the large diameter (d1) thereof lies parallel to the longitudinal axis (x) of the bar and the ratio of large (d1) to small (d2) diameter is 1:1 to 3:1.
2. Chill mould according to claim 1, characterised in that the ratio of large (d1) to small (d2) diameter is not more than 2:1.
3. Chill mould according to claim 1 or 2, characterised in that the shield (24) can be adjusted in height parallel to the longitudinal axis (x) of the bar in relation to the position of the inductor (18).
4. Chill mould according to any of claims 1 to 3, characterised in that the shield (24) is arranged at least partially inside a guide panel (22) of electrically insulating material which is a poor heat conductor.
5. Chill mould according to any of claims 1 to 4, characterised in that the coolant outlet opening (26) of the cooling device (12) is arranged above the shield (24) and directed onto a coolant guide surface (28) of a mould body (30) arranged on the side of the shield (24) facing away from the bar (32).
6. Chill mould according to claim 5, characterised in that the mould body (30) with the coolant guide surface (28) can be adjusted in height in relation to the position of the inductor (18).
7. Chill mould according to any of claims 1 to 4, characterised in that the coolant outlet opening (36) of the cooling device (34) is arranged below the shield (24).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH268/92 | 1992-01-30 | ||
| CH26892 | 1992-01-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2088075A1 true CA2088075A1 (en) | 1993-07-31 |
Family
ID=4183134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002088075A Abandoned CA2088075A1 (en) | 1992-01-30 | 1993-01-26 | Electromagnetic continuous chill casting mould |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0553597A1 (en) |
| JP (1) | JPH05277642A (en) |
| AU (1) | AU3041192A (en) |
| CA (1) | CA2088075A1 (en) |
| ZA (1) | ZA9362B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5323841A (en) * | 1992-11-04 | 1994-06-28 | Wagstaff, Inc. | Annular metal casting unit |
| CN108405821B (en) * | 2018-04-03 | 2019-09-03 | 东北大学 | The casting device and method of the big specification magnesium alloy slab ingot of flawless |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT306939B (en) * | 1969-06-24 | 1973-04-25 | Kuibyshevsky Metall Zd Im V I | Plant for continuous casting |
| SU350321A1 (en) * | 1971-04-27 | 1977-12-05 | Белокалитвинский металлургический завод | Multicavity electromagnetic ingot mould |
| US4126175A (en) * | 1977-02-14 | 1978-11-21 | Getselev Zinovy N | Electromagnetic mould for the continuous and semicontinuous casting of hollow ingots |
| US4796689A (en) * | 1987-03-23 | 1989-01-10 | Swiss Aluminium Ltd. | Mold for electromagnetic continuous casting |
-
1992
- 1992-12-23 AU AU30411/92A patent/AU3041192A/en not_active Abandoned
- 1992-12-28 EP EP92811025A patent/EP0553597A1/en not_active Withdrawn
-
1993
- 1993-01-06 ZA ZA9362A patent/ZA9362B/en unknown
- 1993-01-26 CA CA002088075A patent/CA2088075A1/en not_active Abandoned
- 1993-01-29 JP JP5013775A patent/JPH05277642A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0553597A1 (en) | 1993-08-04 |
| AU3041192A (en) | 1993-08-05 |
| JPH05277642A (en) | 1993-10-26 |
| ZA9362B (en) | 1993-08-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |