WO2010034084A1 - Twin roll caster - Google Patents
Twin roll caster Download PDFInfo
- Publication number
- WO2010034084A1 WO2010034084A1 PCT/AU2009/001297 AU2009001297W WO2010034084A1 WO 2010034084 A1 WO2010034084 A1 WO 2010034084A1 AU 2009001297 W AU2009001297 W AU 2009001297W WO 2010034084 A1 WO2010034084 A1 WO 2010034084A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- molten metal
- tundish
- delivery nozzle
- rolls
- caster
- 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.)
- Ceased
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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/064—Accessories therefor for supplying molten metal
-
- 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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
Definitions
- the present invention relates to a twin roll caster for continuously producing a metal strip, such as a steel strip.
- molten metal is introduced between a pair of counter-rotated horizontal casting rolls that are cooled so that metal shells solidify on the moving roll surfaces and are brought together at a nip between them to produce a solidified strip product delivered downwardly from the nip between the rolls.
- nip is used herein to refer to the general region at which the rolls are closest together.
- the molten metal may be poured from a ladle into a tundish from which it flows through a metal delivery nozzle or series of delivery nozzles (also called “core nozzles") located above the nip, forming a casting pool of molten metal supported on the casting surfaces of the rolls immediately above the nip and extending along the length of the nip.
- This casting pool is usually confined between side plates or dams held in sliding engagement with end surfaces of the casting rolls so as to dam the two ends of the casting pool against outflow.
- Fig. 3 shows a conventional twin roll caster of the type described above comprising a pair of chilled rolls 1 arranged horizontally side by side and a pair of side dams 2 associated with the rolls 1.
- the chilled rolls 1 are constructed such that cooling water may be passed through the rolls and a nip G between the rolls may be expanded and/or contracted depending on the required thickness of a strip 3 to be produced by the caster.
- the rotation speed and direction of the chilled rolls 1 are set such that outer peripheries of the rolls move at the same speed from above a nip G and downwardly between the rolls and into and through the nip.
- a molten metal delivery piece or delivery nozzle 4 is arranged in a space defined by the chilled rolls 1 and the side dams 2 and above the nip G between the rolls.
- the delivery nozzle 4 is in the form of an open-topped elongated trough 6 for receiving molten metal 5 and has longitudinal side walls formed with openings 7 for supply of the molten metal 5 from the trough 6 towards the chilled rolls 1.
- the openings 7 are formed on the side walls adjacent lower ends thereof and are aligned along axes of the rolls 1.
- a molten metal pool 8 is formed to contact the outer peripheries of the rolls 1.
- a tundish 9 is arranged above the delivery nozzle 4 for continuously supplying the molten metal 5 to the delivery nozzle 4.
- the tundish 9 comprises (a) a body 12 in the form of steel sheet box, with the body having a bottom with an elongate opening 11 which is parallel to the axes of the rolls 1 (b) a discharge piece 10 fitted in the opening 11, (c) refractory material 13 shrouding inner walls of the body 12, (d) refractory material 14 shrouding an inner bottom of the body 12 except for a portion into which the discharge piece 10 is fitted, and (e) a steel sheet liner 15 shrouding a bottom of the body 12 except for the opening 11.
- the discharge piece 10 is made of a refractory material and comprises a plurality of holes 16 for allowing the molten metal 5 in the tundish 9 to flow downwardly from the tundish into the delivery nozzle 4.
- twin roll caster in use, cooling water is passed through the chilled rolls 1 to cool the same, and the molten metal 5 is continuously supplied from the tundish 9 to the delivery nozzle 4 to form the molten metal pool 8 between the rolls 1.
- the molten metal 5 is solidified into shells on the outer peripheries of the rolls 1.
- the solidified shells on the outer peripheries of the rolls 1 are brought together at the nip G as the rolls 1 are rotated, and delivered downwardly from the nip G as cast strip 3.
- the momentum of the molten metal 5 that is discharged through the openings 7 of the delivery nozzle 4 may be too high and, as a consequence, the strip 3 delivered from the nip G may have longitudinally-extending blisters at positions corresponding to the openings 7 of the delivery nozzle 4.
- One option to prevent the longitudinally- extending blisters being produced is to position the tundish 9 closer to the delivery nozzle 4 to reduce the distance between the inside of the tundish 9 (i.e. the upper portion of the discharge piece 10) and the surface of the molten metal pool 8 so as to reduce the fall distance and speed and hence the potential energy of the molten metal 5 that flows from the tundish 9 into the delivery nozzle 4, thereby to reduce the momentum of the molten metal 5 flow discharged through the openings 7 compared to the momentum of the molten metal in the conventional caster.
- the present invention provides a twin roll caster comprising a pair of chilled rolls, a pair of side dams, a delivery nozzle arranged in a space defined by the chilled rolls and the side dams for directing molten metal from above to outer peripheries of the rolls, and a tundish arranged above the delivery nozzle for receiving the molten metal and supplying the molten metal to the delivery nozzle, the tundish having a bottom that includes a molten metal discharge section that projects downwardly from a surrounding section of the tundish bottom and defines a depression in the tundish bottom, and the molten metal discharge section including an opening for discharging molten metal downwardly into the delivery nozzle.
- the molten metal discharge section may be in the form of an elongate trough.
- the trough may comprise a bottom wall and side walls that project downwardly from the surrounding sections of the tundish bottom.
- the wall thickness of the bottom wall may be at least equal to the wall thickness of the surrounding section of the tundish bottom.
- the present invention also provides a twin roll caster comprising a pair of chilled rolls, a pair of side dams, a delivery nozzle arranged in a space defined by the chilled rolls and the side dams for directing molten metal from above to outer peripheries of the rolls, a tundish arranged above the delivery nozzle for receiving the molten metal and supplying the molten metal to the delivery nozzle, and a discharge piece incorporated in a bottom of the tundish and having openings for discharging the molten metal downwardly into to the delivery nozzle, wherein the discharge piece projects downwardly from a surrounding section of the tundish bottom and defines a depression in the tundish bottom, and the discharge piece includes an opening for discharging molten metal downwardly into the delivery nozzle.
- the discharge piece may comprise an elongate trough.
- the trough may comprise a bottom wall and side walls that project downwardly from the surrounding sections of the tundish bottom.
- the wall thickness of the bottom wall may be at least equal to the wall thickness of the surrounding section of the tundish bottom.
- the discharge piece may be incorporated in the tundish bottom by providing the tundish bottom with an opening and positioning the discharge piece in the opening.
- the present invention also provides the above- described discharge piece.
- the present invention also provides a method of casting metal strip comprising:
- the depression in the tundish bottom formed by the molten metal discharge section or the discharge piece means that the molten metal has a less speed and potential energy.
- the momentum of the molten metal discharged from the delivery nozzle is reduced compared to that of the conventional caster, thereby reducing the possibility of the above-described shape defect of longitudinally extending striped blisters in cast strip.
- Fig. 1 is a schematic view showing an embodiment of a twin roll caster according to the invention
- Fig. 2 is a schematic view showing the shape of the discharge piece in Fig. 1 and the spacial relationship between the molten metal pool and the discharge piece;
- Fig. 3 is a schematic view showing a conventional twin roll caster.
- Figs. 1 and 2 show an embodiment of a twin roll caster for casting steel strip, typically less than 2 mm thick, according to the invention the caster comprise a pair of chilled roll 1 arranged horizontally side by side and a pair of side dams 2 associated with the rolls 1, a delivery nozzle 4, and a tundish 19 for continuously supplying molten metal 5 to the delivery nozzle 4.
- the tundish 19 comprises a body 12 in the form of steel sheet box, the body having a bottom formed with an elongate opening 11 which is parallel to the axes of the rolls 1, a discharge piece 20 fitted in the opening 11, refractory material 13 shrouding inner walls of the body 12 , refractory material 14 shrouding an inner bottom of the body 12 save for the section of the body 12 into which the discharge piece 20 is fitted, and a liner 15 made of steel sheet and shrouding a bottom of the body 12 except for the opening 11.
- the discharge piece 20 is made of refractory material and is formed with a plurality of holes 21 which allow the molten metal 5 in the tundish 19 to flow down ' into the delivery nozzle 4.
- the tundish 19 is positioned in relation to the delivery nozzle 4 so that the discharge piece 20 is above the delivery nozzle 4.
- the discharge piece 20 is in the form of an elongate trough with a bottom wall 61 and side walls 63 and outwardly extending top walls 65. In effect, the discharge piece 20 forms a downward depression 22 in the bottom of the tundish 19.
- the depression 22 has a flat inner bottom.
- the discharge piece 20 is also formed so that the bottom wall 61 and the side walls 63 protrude downwardly from the bottom of the tundish 19. This downward protrusion 23 has a flat bottom.
- the wall thickness tl of the bottom wall 61 of the discharge piece 20 is greater than the wall thickness t2 of the top walls 65 of the piece.
- the wall thickness tl of the bottom wall 61 of the discharge piece 20 is greater than the wall thickness of a surrounding section of the tundish bottom.
- the molten metal 5 is continuously supplied from the tundish 19 to the delivery nozzle 4 to form a molten metal pool 8.
- the chilled rolls 1 are counter- rotated so that the molten metal 5 is solidified on the outer peripheries of the chilled rolls 1 into solidified shells.
- the solidified shells on the outer peripheries of the rolls 1 are brought together at the nip G into a strip 3 which is delivered downward from the nip G.
- the discharge piece 20 forms a depression 22 in the tundish bottom at a position directly above the delivery nozzle 4.
- the distance A between the inner bottom of the depression 22 formed by the discharge piece 20 and the surface of the molten metal pool 8 is less than the distance B between the surrounding section of the tundish bottom the surface of the molten metal pool 8.
- the speed and the potential energy of the molten metal 5 supplied to the discharge nozzle 4 is less than is the case in the conventional caster, thereby reducing the momentum of the molten metal 5 flow through the openings 7 of the delivery nozzle 4 toward the outer peripheries of the chilled rolls 1 compared to the momentum generated in the conventional caster, and thereby minimising the possibility of the formation of the above-mentioned blister-like shape defects in cast strip 3.
- forming the discharge piece 20 so that it projects downwardly from the tundish bottom has a beneficial effect of making it possible to maintain the wall thickness so that the durability of the discharge piece is not impaired. This feature also makes it possible to increase the wall thickness and thereby improve durability.
- twin roll caster according to the invention is not limited to the above embodiment and that various changes and modifications may ⁇ be made without departing from the spirit and scope of the invention.
- the present invention is not so limited and extends to arrangements in which the tundish bottom comprises a molten metal discharge section that has the same structure as the above-described discharge piece 20.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
A twin roll caster is disclosed. The caster comprises a pair of chilled rolls (1), a pair of side dams (2), a delivery nozzle (4) arranged in a space defined by the chilled rolls and the side dams for directing molten metal from above to outer peripheries of the rolls, and a tundish (19) arranged above the delivery nozzle for receiving the molten metal and supplying the molten metal to the delivery nozzle. The tundish has a bottom that includes a molten metal discharge section or incorporates a discharge piece (20) that projects downwardly from a surrounding section of the tundish bottom and defines a depression in the tundish bottom. The molten metal discharge section or discharge piece includes an opening for discharging molten metal downwardly into the delivery nozzle.
Description
TWIN ROLL CASTER
Technical Field
The present invention relates to a twin roll caster for continuously producing a metal strip, such as a steel strip.
Background Art
In a twin roll caster molten metal is introduced between a pair of counter-rotated horizontal casting rolls that are cooled so that metal shells solidify on the moving roll surfaces and are brought together at a nip between them to produce a solidified strip product delivered downwardly from the nip between the rolls. The term "nip" is used herein to refer to the general region at which the rolls are closest together. The molten metal may be poured from a ladle into a tundish from which it flows through a metal delivery nozzle or series of delivery nozzles (also called "core nozzles") located above the nip, forming a casting pool of molten metal supported on the casting surfaces of the rolls immediately above the nip and extending along the length of the nip. This casting pool is usually confined between side plates or dams held in sliding engagement with end surfaces of the casting rolls so as to dam the two ends of the casting pool against outflow.
Fig. 3 shows a conventional twin roll caster of the type described above comprising a pair of chilled rolls 1 arranged horizontally side by side and a pair of side dams 2 associated with the rolls 1.
The chilled rolls 1 are constructed such that cooling water may be passed through the rolls and a nip G
between the rolls may be expanded and/or contracted depending on the required thickness of a strip 3 to be produced by the caster. The rotation speed and direction of the chilled rolls 1 are set such that outer peripheries of the rolls move at the same speed from above a nip G and downwardly between the rolls and into and through the nip.
One of the side dams 2 contacts the end of one of the chilled rolls 1 and the other side dam 2 contacts the end of the other roll 1. A molten metal delivery piece or delivery nozzle 4 is arranged in a space defined by the chilled rolls 1 and the side dams 2 and above the nip G between the rolls.
The delivery nozzle 4 is in the form of an open-topped elongated trough 6 for receiving molten metal 5 and has longitudinal side walls formed with openings 7 for supply of the molten metal 5 from the trough 6 towards the chilled rolls 1. The openings 7 are formed on the side walls adjacent lower ends thereof and are aligned along axes of the rolls 1. As the molten metal is poured into and from the trough 6, a molten metal pool 8 is formed to contact the outer peripheries of the rolls 1.
A tundish 9 is arranged above the delivery nozzle 4 for continuously supplying the molten metal 5 to the delivery nozzle 4. The tundish 9 comprises (a) a body 12 in the form of steel sheet box, with the body having a bottom with an elongate opening 11 which is parallel to the axes of the rolls 1 (b) a discharge piece 10 fitted in the opening 11, (c) refractory material 13 shrouding inner walls of the body 12, (d) refractory material 14 shrouding an inner bottom of the body 12 except for a portion into which the discharge piece 10 is
fitted, and (e) a steel sheet liner 15 shrouding a bottom of the body 12 except for the opening 11. The discharge piece 10 is made of a refractory material and comprises a plurality of holes 16 for allowing the molten metal 5 in the tundish 9 to flow downwardly from the tundish into the delivery nozzle 4.
It has been recently proposed to provide a gas seal means 17 between the chilled rolls 1 and the tundish 9 and resilient seal members 18 between the gas seal means 17 and the liner 15 of the tundish 9 to define a closed space above the molten metal pool 8 and to supply inert gas onto the outer peripheries of the rolls 1 in this space so as to establish and maintain an inert gas atmosphere in the space.
In the above-described twin roll caster, in use, cooling water is passed through the chilled rolls 1 to cool the same, and the molten metal 5 is continuously supplied from the tundish 9 to the delivery nozzle 4 to form the molten metal pool 8 between the rolls 1. In this state, as the rolls 1 are counter-rotated, the molten metal 5 is solidified into shells on the outer peripheries of the rolls 1. The solidified shells on the outer peripheries of the rolls 1 are brought together at the nip G as the rolls 1 are rotated, and delivered downwardly from the nip G as cast strip 3.
The above description is not to be understood as an admission of the common general knowledge in Australia or elsewhere.
Summary of Invention
Technical Problems
In the twin roll caster shown in Fig. 3, the momentum of the molten metal 5 that is discharged through the openings 7 of the delivery nozzle 4 may be too high and, as a consequence, the strip 3 delivered from the nip G may have longitudinally-extending blisters at positions corresponding to the openings 7 of the delivery nozzle 4.
One option to prevent the longitudinally- extending blisters being produced is to position the tundish 9 closer to the delivery nozzle 4 to reduce the distance between the inside of the tundish 9 (i.e. the upper portion of the discharge piece 10) and the surface of the molten metal pool 8 so as to reduce the fall distance and speed and hence the potential energy of the molten metal 5 that flows from the tundish 9 into the delivery nozzle 4, thereby to reduce the momentum of the molten metal 5 flow discharged through the openings 7 compared to the momentum of the molten metal in the conventional caster.
One option to reduce the distance between the inside of the tundish 9 (i.e. the upper portion of the discharge piece 10) and the surface of the molten metal pool 8 is to reduce the wall thickness of the discharge piece 10. However, this would result in a loss of durability of the discharge piece 10. Moreover, it may not be an option to reduce the above distance by simply changing the re-positioning the tundish to be closer to the delivery nozzle 4 in view of equipment constraints, for example due to the provision of the gas seal means 17.
Solution to Problems
The present invention provides a twin roll caster comprising a pair of chilled rolls, a pair of side dams, a delivery nozzle arranged in a space defined by the chilled rolls and the side dams for directing molten metal from above to outer peripheries of the rolls, and a tundish arranged above the delivery nozzle for receiving the molten metal and supplying the molten metal to the delivery nozzle, the tundish having a bottom that includes a molten metal discharge section that projects downwardly from a surrounding section of the tundish bottom and defines a depression in the tundish bottom, and the molten metal discharge section including an opening for discharging molten metal downwardly into the delivery nozzle.
The molten metal discharge section may be in the form of an elongate trough.
The trough may comprise a bottom wall and side walls that project downwardly from the surrounding sections of the tundish bottom.
The wall thickness of the bottom wall may be at least equal to the wall thickness of the surrounding section of the tundish bottom.
The present invention also provides a twin roll caster comprising a pair of chilled rolls, a pair of side dams, a delivery nozzle arranged in a space defined by the chilled rolls and the side dams for directing molten metal from above to outer peripheries of the rolls, a tundish arranged above the delivery nozzle for receiving the molten metal and supplying the molten metal to the delivery nozzle, and a discharge piece incorporated in a
bottom of the tundish and having openings for discharging the molten metal downwardly into to the delivery nozzle, wherein the discharge piece projects downwardly from a surrounding section of the tundish bottom and defines a depression in the tundish bottom, and the discharge piece includes an opening for discharging molten metal downwardly into the delivery nozzle.
The discharge piece may comprise an elongate trough.
The trough may comprise a bottom wall and side walls that project downwardly from the surrounding sections of the tundish bottom.
The wall thickness of the bottom wall may be at least equal to the wall thickness of the surrounding section of the tundish bottom.
The discharge piece may be incorporated in the tundish bottom by providing the tundish bottom with an opening and positioning the discharge piece in the opening.
The present invention also provides the above- described discharge piece.
The present invention also provides a method of casting metal strip comprising:
(a) assembling a pair of counter-rotatable casting rolls to form a nip there between through which strip can be cast and a pair of side dams adjacent the ends of the casting rolls capable of supporting a casting pool of molten metal formed on the casting surfaces above the nip,
(b) positioning a metal delivery nozzle axially along and above the nip and capable of discharging molten metal to form the casting pool,
(c) positioning a tundish having a molten metal discharge section or a discharge piece above the discharge nozzle and capable of discharging molten metal from the tundish into the delivery nozzle, and
(d) supplying molten metal to the discharge nozzle via the tundish and forming a molten metal pool that is confined by the casting rolls and the side dams and counter-rotating the rolls and forming a downwardly moving cast strip.
Advantages of the Invention
The advantages of the twin roll caster of the present invention include the following advantages:
(1) The depression in the tundish bottom formed by the molten metal discharge section or the discharge piece means that the molten metal has a less speed and potential energy. As a result, the momentum of the molten metal discharged from the delivery nozzle is reduced compared to that of the conventional caster, thereby reducing the possibility of the above-described shape defect of longitudinally extending striped blisters in cast strip.
(2) Forming the discharge piece so that it projects downwardly from the tundish bottom makes it possible to maintain the wall thickness of the molten metal discharge section or the discharge piece so that the durability of these sections of the tundish is not impaired. This
feature also makes it possible to increase the wall thickness and thereby improve durability.
Brief Description of Drawings
The present invention is described further by way of example with reference to the accompanying drawings, of which:
Fig. 1 is a schematic view showing an embodiment of a twin roll caster according to the invention;
Fig. 2 is a schematic view showing the shape of the discharge piece in Fig. 1 and the spacial relationship between the molten metal pool and the discharge piece; and
Fig. 3 is a schematic view showing a conventional twin roll caster.
Description of Embodiment
Figs. 1 and 2 show an embodiment of a twin roll caster for casting steel strip, typically less than 2 mm thick, according to the invention the caster comprise a pair of chilled roll 1 arranged horizontally side by side and a pair of side dams 2 associated with the rolls 1, a delivery nozzle 4, and a tundish 19 for continuously supplying molten metal 5 to the delivery nozzle 4.
In the Figs. 1 and 2, parts similar to those in Fig. 3 are represented by the same reference numerals.
With reference to Figs. 1 and 2, the tundish 19 comprises a body 12 in the form of steel sheet box, the
body having a bottom formed with an elongate opening 11 which is parallel to the axes of the rolls 1, a discharge piece 20 fitted in the opening 11, refractory material 13 shrouding inner walls of the body 12 , refractory material 14 shrouding an inner bottom of the body 12 save for the section of the body 12 into which the discharge piece 20 is fitted, and a liner 15 made of steel sheet and shrouding a bottom of the body 12 except for the opening 11. The discharge piece 20 is made of refractory material and is formed with a plurality of holes 21 which allow the molten metal 5 in the tundish 19 to flow down ' into the delivery nozzle 4.
The tundish 19 is positioned in relation to the delivery nozzle 4 so that the discharge piece 20 is above the delivery nozzle 4. The discharge piece 20 is in the form of an elongate trough with a bottom wall 61 and side walls 63 and outwardly extending top walls 65. In effect, the discharge piece 20 forms a downward depression 22 in the bottom of the tundish 19. The depression 22 has a flat inner bottom. The discharge piece 20 is also formed so that the bottom wall 61 and the side walls 63 protrude downwardly from the bottom of the tundish 19. This downward protrusion 23 has a flat bottom.
With reference to Fig. 2 the wall thickness tl of the bottom wall 61 of the discharge piece 20 is greater than the wall thickness t2 of the top walls 65 of the piece. In addition, the wall thickness tl of the bottom wall 61 of the discharge piece 20 is greater than the wall thickness of a surrounding section of the tundish bottom.
In use of the twin roll caster, with cooling water being passed through the chilled rolls 1 to cool
the same, the molten metal 5 is continuously supplied from the tundish 19 to the delivery nozzle 4 to form a molten metal pool 8. The chilled rolls 1 are counter- rotated so that the molten metal 5 is solidified on the outer peripheries of the chilled rolls 1 into solidified shells. As the chilled rolls 1 are rotated, the solidified shells on the outer peripheries of the rolls 1 are brought together at the nip G into a strip 3 which is delivered downward from the nip G.
As is noted above, the discharge piece 20 forms a depression 22 in the tundish bottom at a position directly above the delivery nozzle 4. As a consequence, the distance A between the inner bottom of the depression 22 formed by the discharge piece 20 and the surface of the molten metal pool 8 is less than the distance B between the surrounding section of the tundish bottom the surface of the molten metal pool 8. As a consequence, the speed and the potential energy of the molten metal 5 supplied to the discharge nozzle 4 is less than is the case in the conventional caster, thereby reducing the momentum of the molten metal 5 flow through the openings 7 of the delivery nozzle 4 toward the outer peripheries of the chilled rolls 1 compared to the momentum generated in the conventional caster, and thereby minimising the possibility of the formation of the above-mentioned blister-like shape defects in cast strip 3. In addition, forming the discharge piece 20 so that it projects downwardly from the tundish bottom has a beneficial effect of making it possible to maintain the wall thickness so that the durability of the discharge piece is not impaired. This feature also makes it possible to increase the wall thickness and thereby improve durability.
- li ¬
lt is to be understood that a twin roll caster according to the invention is not limited to the above embodiment and that various changes and modifications may¬ be made without departing from the spirit and scope of the invention.
By way of example, whilst the above embodiment includes a separate discharge piece 20 that is incorporated into an opening in the tundish bottom, the present invention is not so limited and extends to arrangements in which the tundish bottom comprises a molten metal discharge section that has the same structure as the above-described discharge piece 20.
Claims
1. A twin roll caster comprising a pair of chilled rolls, a pair of side dams, a delivery nozzle arranged in a space defined by the chilled rolls and the side dams for directing molten metal from above to outer peripheries of the rolls, and a tundish arranged above the delivery nozzle for receiving the molten metal and supplying the molten metal to the delivery nozzle, the tundish having a bottom that includes a molten metal discharge section that projects downwardly from a surrounding section of the tundish bottom and defines a depression in the tundish bottom, and the molten metal discharge section including an opening for discharging molten metal downwardly into the delivery nozzle.
2. The caster defined in claim 1 wherein the molten metal discharge section is in the form of an elongate trough.
3. The caster defined in claim 2 wherein the trough comprises a bottom wall and side walls that project downwardly from the surrounding sections of the tundish bottom.
4. The caster defined in claim 3 wherein the wall thickness of the bottom wall is at least equal to the wall thickness of the surrounding section of the tundish bottom.
5. A twin roll caster comprising a pair of chilled rolls, a pair of side dams, a delivery nozzle arranged in a space defined by the chilled rolls and the side dams for directing molten metal from above to outer peripheries of the rolls, a tundish arranged above the delivery nozzle for receiving the molten metal and supplying the molten metal to the delivery nozzle, and a discharge piece incorporated in a bottom of the tundish and having openings for discharging the molten metal downwardly into to the delivery nozzle, wherein the discharge piece projects downwardly from a surrounding section of the tundish bottom and defines a depression in the tundish bottom, and the discharge piece includes an opening for discharging molten metal downwardly into the delivery nozzle.
6. The caster defined in claim 5 wherein the discharge piece comprises an elongate trough.
7. The caster defined in claim 6 wherein the trough comprises a bottom wall and side walls that project downwardly from the surrounding sections of the tundish bottom.
8. The caster defined in claim 7 wherein the wall thickness of the bottom wall is at least equal to the wall thickness of the surrounding section of the tundish bottom.
9. The caster defined in any one of claims 5 to 8 wherein the discharge piece is incorporated in the tundish bottom by providing the tundish bottom with an opening and positioning the discharge piece in the opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200980140014.0A CN102176991B (en) | 2008-09-29 | 2009-09-29 | Twin Roll Casting Machine |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008-251240 | 2008-09-29 | ||
| JP2008251240A JP2010082626A (en) | 2008-09-29 | 2008-09-29 | Twin roll caster |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2010034084A1 true WO2010034084A1 (en) | 2010-04-01 |
Family
ID=42059226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/AU2009/001297 Ceased WO2010034084A1 (en) | 2008-09-29 | 2009-09-29 | Twin roll caster |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2010082626A (en) |
| CN (1) | CN102176991B (en) |
| WO (1) | WO2010034084A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8813828B2 (en) | 2011-12-09 | 2014-08-26 | Nucor Corporation | Casting delivery nozzle |
| CN108907124A (en) * | 2018-07-19 | 2018-11-30 | 芜湖君华材料有限公司 | A kind of fast quenching device of amorphous alloy solution casting |
| CN112844912A (en) * | 2021-02-25 | 2021-05-28 | 佛山市中研非晶科技股份有限公司 | Combined nozzle system of amorphous nanocrystalline strip manufacturing equipment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111421045B (en) * | 2020-04-21 | 2025-03-11 | 上海治臻新能源股份有限公司 | A waste separation mechanism for preparing metal plate trimmings for fuel cells |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2249978A (en) * | 1990-11-26 | 1992-05-27 | Ishikawajima Harima Heavy Ind | Tundish flow control |
| GB2261619A (en) * | 1991-11-21 | 1993-05-26 | Ishikawajima Harima Heavy Ind | Strip casting |
| GB2266256A (en) * | 1992-04-24 | 1993-10-27 | Ishikawajima Harima Heavy Ind | Delivery nozzle in metal strip casting |
| WO1997027015A1 (en) * | 1996-01-24 | 1997-07-31 | Ishikawajima-Harima Heavy Industries Company Limited | Metal delivery system for continuous caster |
| EP0627275B1 (en) * | 1993-05-27 | 2000-07-12 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Casting metal strip |
-
2008
- 2008-09-29 JP JP2008251240A patent/JP2010082626A/en not_active Withdrawn
-
2009
- 2009-09-29 WO PCT/AU2009/001297 patent/WO2010034084A1/en not_active Ceased
- 2009-09-29 CN CN200980140014.0A patent/CN102176991B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2249978A (en) * | 1990-11-26 | 1992-05-27 | Ishikawajima Harima Heavy Ind | Tundish flow control |
| GB2261619A (en) * | 1991-11-21 | 1993-05-26 | Ishikawajima Harima Heavy Ind | Strip casting |
| GB2266256A (en) * | 1992-04-24 | 1993-10-27 | Ishikawajima Harima Heavy Ind | Delivery nozzle in metal strip casting |
| EP0627275B1 (en) * | 1993-05-27 | 2000-07-12 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Casting metal strip |
| WO1997027015A1 (en) * | 1996-01-24 | 1997-07-31 | Ishikawajima-Harima Heavy Industries Company Limited | Metal delivery system for continuous caster |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8813828B2 (en) | 2011-12-09 | 2014-08-26 | Nucor Corporation | Casting delivery nozzle |
| US8978738B2 (en) | 2011-12-09 | 2015-03-17 | Nucor Corporation | Casting delivery nozzle |
| US9126262B2 (en) | 2011-12-09 | 2015-09-08 | Nucor Corporation | Casting delivery nozzle |
| CN108907124A (en) * | 2018-07-19 | 2018-11-30 | 芜湖君华材料有限公司 | A kind of fast quenching device of amorphous alloy solution casting |
| CN112844912A (en) * | 2021-02-25 | 2021-05-28 | 佛山市中研非晶科技股份有限公司 | Combined nozzle system of amorphous nanocrystalline strip manufacturing equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102176991A (en) | 2011-09-07 |
| CN102176991B (en) | 2015-04-01 |
| JP2010082626A (en) | 2010-04-15 |
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