CA2730616A1 - Electromagnetic braking device on continuous casting molds - Google Patents
Electromagnetic braking device on continuous casting molds Download PDFInfo
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- CA2730616A1 CA2730616A1 CA2730616A CA2730616A CA2730616A1 CA 2730616 A1 CA2730616 A1 CA 2730616A1 CA 2730616 A CA2730616 A CA 2730616A CA 2730616 A CA2730616 A CA 2730616A CA 2730616 A1 CA2730616 A1 CA 2730616A1
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- mold
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- dip tube
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- 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
- B22D11/10—Supplying or treating 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
To bring about a direct effect on the fluid streams exiting the mould dip tube (2) of moulds in continuous casting moulds (1) of a continuous casting plant for casting liquid metals, in particular liquid steel materials for producing slab and thin slab products with format widths of 750 to 3500 mm and format thicknesses of 30 to 500 mm, said casting plant being equipped with an electromagnetic braking device for improving the product quality, it is proposed to dispose at least two poles (10) per mould broad side (3) symmetrically with respect to the perpendicular reference line (4) of the mould dip tube (2) such that the primary axes (12) of the poles' outlet cross section (11a) are aligned at a specific angle (.alpha.1, and .alpha.2) relative to the perpendicular reference line (4) of the mould dip tube (2).
Description
ELECTROMAGNETIC BRAKING DEVICE
ON CONTINUOUS CASTING MOLDS
The invention concerns a method and a device for casting liquid metals, especially liquid steel works materials, to produce slab and thin-slab products with format widths of 750 to 3,500 mm and format thicknesses of 30 to 500 mm in a continuous casting installation, which, for the purpose of achieving improved product quality, is equipped with an electromagnetic braking device that consists of coils with cores and a yoke, by whose generated magnetic field effect the flow conditions within the liquid metal in the mold are controlled.
To improve product quality by exerting a positive effect on the flow conditions within the continuous casting mold, it is already known that the mold can be equipped with an electromagnetic brake, which consists of coils with cores and a yoke, with which magnetic fields are generated, which are used to influence the flow conditions prevailing in the steel bath within the mold. In this connection, to develop the fullest possible effectiveness of the magnetic fields, it is necessary to bring the magnetic fields as close as possible to the continuous casting mold. Therefore, usually either the electromagnetic braking systems are moved up to the mold by hydraulic or electromechanical means only after the mold has been placed in the casting machine or they are permanently installed in various arrangements on the mold of the continuous casting installation. In this regard, basically, the coil or the coil combinations, each with a core, are positioned from the outside on the mold or on the water tank, through which water flows, or on the rear side of the copper plate, or the coil is permanently fixed on the structural steel work, and a moving core is moved through it into the mold.
WO 2004/022264 Al, for example, discloses an electromagnetic braking device for molten steel flowing into a continuous casting mold, which comprises at least one magnetic coil with a ferromagnetic core assigned to the broad sides of the mold.
To reduce the oscillating masses and at the same time increase the strength of the magnetic field, the core consists, on the one hand, of a primary part that houses the magnetic coil and can be moved to vary its distance from the broad-side walls and, on the other hand, of attachments that are fixed in water tanks of the mold, such that the parts of the core, when they are move together into their operating position, form U-shaped
ON CONTINUOUS CASTING MOLDS
The invention concerns a method and a device for casting liquid metals, especially liquid steel works materials, to produce slab and thin-slab products with format widths of 750 to 3,500 mm and format thicknesses of 30 to 500 mm in a continuous casting installation, which, for the purpose of achieving improved product quality, is equipped with an electromagnetic braking device that consists of coils with cores and a yoke, by whose generated magnetic field effect the flow conditions within the liquid metal in the mold are controlled.
To improve product quality by exerting a positive effect on the flow conditions within the continuous casting mold, it is already known that the mold can be equipped with an electromagnetic brake, which consists of coils with cores and a yoke, with which magnetic fields are generated, which are used to influence the flow conditions prevailing in the steel bath within the mold. In this connection, to develop the fullest possible effectiveness of the magnetic fields, it is necessary to bring the magnetic fields as close as possible to the continuous casting mold. Therefore, usually either the electromagnetic braking systems are moved up to the mold by hydraulic or electromechanical means only after the mold has been placed in the casting machine or they are permanently installed in various arrangements on the mold of the continuous casting installation. In this regard, basically, the coil or the coil combinations, each with a core, are positioned from the outside on the mold or on the water tank, through which water flows, or on the rear side of the copper plate, or the coil is permanently fixed on the structural steel work, and a moving core is moved through it into the mold.
WO 2004/022264 Al, for example, discloses an electromagnetic braking device for molten steel flowing into a continuous casting mold, which comprises at least one magnetic coil with a ferromagnetic core assigned to the broad sides of the mold.
To reduce the oscillating masses and at the same time increase the strength of the magnetic field, the core consists, on the one hand, of a primary part that houses the magnetic coil and can be moved to vary its distance from the broad-side walls and, on the other hand, of attachments that are fixed in water tanks of the mold, such that the parts of the core, when they are move together into their operating position, form U-shaped
2 yokes to generate a closed magnetic flux.
DE 10 2004 046 729 Al discloses a magnetic brake for a continuous casting mold, in which a magnetic field generated by permanent magnets is meant to control the flow of the liquid metal. To obtain variation of the magnetic field strength, the permanent magnets arranged on the mold can be variously adjusted in groups to alter the field strength distribution. In this regard, provision is also made for permanent magnets to be arranged in the water tank of the continuous casting mold and for it to be possible to adjust them to rest directly against the mold plate.
DE 195 33 577 discloses a continuous casting mold for casting steel, which has an electromagnetic device that comprises a plurality of stirrer elements. These stirrer elements are arranged in pairs at intervals along the outside wall of the mold and are connected to an a.c. power supply.
The stirrer elements stir the molten metal in the continuous casting mold in such a way that bubbling on the surface of the molten metal and the formation of bridges of solidified metal between the dip tube and the wall of the mold in the upper region of the continuous casting mold are avoided.
EP 0 045 938 discloses a method and a device for stirring a liquid core of a continuously cast steel strand of
DE 10 2004 046 729 Al discloses a magnetic brake for a continuous casting mold, in which a magnetic field generated by permanent magnets is meant to control the flow of the liquid metal. To obtain variation of the magnetic field strength, the permanent magnets arranged on the mold can be variously adjusted in groups to alter the field strength distribution. In this regard, provision is also made for permanent magnets to be arranged in the water tank of the continuous casting mold and for it to be possible to adjust them to rest directly against the mold plate.
DE 195 33 577 discloses a continuous casting mold for casting steel, which has an electromagnetic device that comprises a plurality of stirrer elements. These stirrer elements are arranged in pairs at intervals along the outside wall of the mold and are connected to an a.c. power supply.
The stirrer elements stir the molten metal in the continuous casting mold in such a way that bubbling on the surface of the molten metal and the formation of bridges of solidified metal between the dip tube and the wall of the mold in the upper region of the continuous casting mold are avoided.
EP 0 045 938 discloses a method and a device for stirring a liquid core of a continuously cast steel strand of
3 rectangular cross section. The device consists of a plurality of coil parts whose longitudinal axis runs obliquely to the adjacent narrow side of the strand. This arrangement makes it possible to reduce the number of white bands and to control their form of development. The brake produces its effect directly on the strand, so that the bath level is not affected in a disadvantageous way.
EP 0 832 704 discloses an electromagnetic brake for a continuous casting mold that produces movement of the molten steel in the mold symmetrically to the dip tube. The arrangement of the coil parts causes symmetric development of the flow right and left of the dip tube and a velocity reduction at the meniscus.
DE 600 16 255 T2 describes a device for casting metals that has an electromagnetic brake comprising magnetic cores, which are permanently mounted on one side of the mold in such a way that they cover essentially the whole width of the mold except for a central section and which are connected with a removable yoke, wherein the winding is arranged around the yoke in such a way that the central axis of the winding extends essentially parallel to a longitudinal axis of the mold and at right angles to the casting direction of the mold.
As a result of these measures, the originally vertically
EP 0 832 704 discloses an electromagnetic brake for a continuous casting mold that produces movement of the molten steel in the mold symmetrically to the dip tube. The arrangement of the coil parts causes symmetric development of the flow right and left of the dip tube and a velocity reduction at the meniscus.
DE 600 16 255 T2 describes a device for casting metals that has an electromagnetic brake comprising magnetic cores, which are permanently mounted on one side of the mold in such a way that they cover essentially the whole width of the mold except for a central section and which are connected with a removable yoke, wherein the winding is arranged around the yoke in such a way that the central axis of the winding extends essentially parallel to a longitudinal axis of the mold and at right angles to the casting direction of the mold.
As a result of these measures, the originally vertically
4 directed flow velocity of the liquid metal cast in the vicinity of the inlet tube is reversed or at least strongly reduced (braked). In addition, horizontal and vertical rotation of the molten cast occurs.
Finally, DE 602 19 062 T2 describes a device for casting metals, wherein magnetic elements comprising magnetic cores and electric conductor windings are arranged along each longitudinal side of the mold. These magnetic elements generate a magnetic field by an applied polyphase alternating voltage. This arrangement of magnetic elements makes it possible to control the movement of the molten material near the upper surface in the end regions and to brake the downward movement of the molten cast.
Proceeding from the prior art described above, the objective of the invention is to specify an arrangement and alignment for the poles of the electromagnetic braking systems by which it is possible to achieve direct control of the flow of the molten steel from the dip tube of the mold.
This objective is achieved with the characterizing features of Claim 1. To achieve direct electromagnetic control of the streams of liquid emerging from the mold dip tube, at least two poles on each broad side of the mold are arranged symmetrically to the vertical reference line of the mold dip tube, such that the primary axes of the exit cross sections of the poles are suitably aligned at a certain angle al and a2.
As a result of the alignment of the poles of the electromagnetic braking device in the primary flow direction of the dip tube flow, the electromagnetic braking device directly controls, as a locally acting field, the streams of liquid emerging from the mold dip tube with respect to their direction, their velocity profile, and their turbulence structure. As a result of the liquid streams modified in this way, the development of detrimental velocity fluctuations in the bath surface are advantageously limited and can thus be controlled. The results that can be achieved in this way include low turbulence in the bath surface, fewer undesirable inclusions of, for example, casting flux or slag, and a homogeneous temperature distribution, and thus all together improved quality of the cast products and an increase in the casting rate.
Due to the concentrated effect of the design and arrangement, in accordance with the invention, of the poles of the electromagnetic braking device on the dip tube flow, the power requirement of the braking device is very low and amounts to only about 1/ to '- of the electric power that it would otherwise be necessary to supply, and, in addition, it is not necessary to adapt the braking device as a function of the format width, but rather it is only necessary to provide for adjustment of the field strength as a function of the throughput.
In this connection, the braking device is operated basically with a permanent field and adjustable field strength by means of direct current; but operation with alternating field strength and possible reversal by means of alternating current is an alternative possibility.
The poles of the electromagnetic braking device of the invention have any desired exit cross section with the formation of a primary axis. This exit cross section can be formed, for example, as a triangle, rectangle, any desired polygon, or with a curved contour.
In accordance with the invention, the primary axes are aligned in a well-defined way, such that the primary axes of the poles intersect the vertical reference line of the mold dip tube above the poles at an angle al of 1 to 89 or, alternatively, below the poles at an angle a2 of 1 to 89 .
The angles al and a2 are manually set by rotation of the poles before operation of the continuous casting installation, or, in accordance with another embodiment of the invention, they are variably adjusted by motorized rotation of the poles during the operation of the continuous casting plant and then changed as required, where the motorized adjustment of the angles is accomplished, for example, by means of a motor, a hydraulic rotary drive, or a hydraulic or pneumatic cylinder.
The possible centers of rotation of the poles preferably lie on their primary axes, but, alternatively, they can also be arranged outside the poles, depending on the geometric realization of the poles.
In one possible embodiment of the invention, the electromagnetic braking device with coils, cores and yoke is positioned directly on the mold, so that it oscillates together with the mold during the operation of the continuous casting installation.
In another possible embodiment of the invention, the electromagnetic braking device is permanently mounted separate from the mold, so that in this case it does not oscillate together with the mold.
Finally, it is also possible to divide the electromagnetic braking device into separate parts, with, for example, the ends of the poles being arranged on the mold, and the coils, the split core, and the yoke being positioned on the stationary machine structure.
Further advantages and details of the invention are more fully explained below with reference to the specific embodiments illustrated in the accompanying schematic drawings.
-- Figure 1 shows a perspective view of a mold with an electromagnetic braking device.
-- Figure 2 shows a cross-sectional side view of a mold for thick slabs with an electromagnetic braking device.
-- Figure 3 shows a cross-sectional side view of a mold for thin slabs with an electromagnetic braking device.
-- Figures 4 and 5 show the mold of Figure 2 with rotatable poles in different angular positions.
-- Figures 6 to 8 show the mold with rotatable poles in different angular positions with an alternative pole design.
-- Figure 9 shows examples of pole designs with the primary axis indicated.
Figure 1 shows a perspective view of the mold 1 of a continuous casting installation with an electromagnetic braking device arranged in the lower region of the mold dip tube 2. The electromagnetic braking device, which consists of the cores 14, the yokes 14', and the magnetic coils 13, is arranged in such a way in accordance with the invention that two poles 10 are positioned opposite each other on each broad side 3 of the mold. They are aligned symmetrically to the vertical reference line 4 of the mold dip tube 2 relative to the principal flow direction of the dip tube flow, so that the primary axes 12 of the exit cross sections of the poles intersect this reference line 4 at a certain angle al. As a result of the reference of the alignment of the poles 10 to the principal flow direction of the dip tube flow, the streams of liquid flowing into the mold 1 are controlled in a direct way by the magnetic field lines created between the poles 10.
The principal flow direction of the dip tube flow, which is not shown in the perspective view of Figure 1, is shown in the cross-sectional side views of Figures 2 to 5.
Figure 2 shows a mold 1 for thick slabs with the principal flow direction 5 of the dip tube flow emerging laterally from the mold dip tube 2 at about right angles.
Corresponding to this principal flow direction 5, a pole 10 is arranged on each side in the lower region of the mold dip tube 2 in such a way that the primary axes 12 of the exit cross section lla of each pole 10 intersects the vertical reference line 4 of the mold dip tube 2 at an angle a. Since the point of intersection is located above the poles 10, this angle is denoted al.
Figure 3 shows a mold 1 for thin slabs with the principal flow direction 5 of the dip tube flow emerging laterally from the mold dip tube 2 at an angle of about 45 . The arrangement of the poles 10 with respect to this principal flow direction is changed from that of Figure 2 in that the point of intersection of the primary axes 12 of the exit cross section lla of each pole 10 with the vertical reference line 4 of the mold dip tube 2 is now located below the poles 10, and for this reason the angle of intersection is denoted a2 to distinguish it from al.
Figures 4 and 5 show an alternative realization of an electromagnetic braking device for a thick slab mold 1 of the type illustrated in Figure 2 for adaptation to altered conditions of the streams of liquid emerging from the mold dip tube 2. The poles 10 of this embodiment are designed to rotate clockwise 18 or counterclockwise 19 about a point of rotation 20 that lies on the primary axes 12 of the exit cross section 11a. In Figure 5, the two poles 10 were rotated clockwise 18 or counterclockwise 19 from their original positions in Figure 4. This caused the original angle al in Figures 2 and 4 to increase to a new value all in Figure 5.
Figures 6 to 8 show examples of possible rotations of the poles 10. The poles 10, which are formed with a curved contour of their exit cross sections 11e, are arranged symmetrically to the vertical reference line 4 of the mold dip tube 2 in the region of the outlet 6 of the mold dip tube 2.
Figure 6 shows an assumed initial position. The initial position of the poles 10 shown in Figure 6 was changed to the position shown in Figure 7 by rotating the left pole 10 inward in direction of rotation 18, i.e., clockwise, and rotating the right pole 10 inward in the opposite direction of rotation 19 by an angular amount of 5 in each case. Rotation of the poles 10 outward in the opposite directions by an angular amount of 20 changes the positions of the poles 10 from their initial positions shown in Figure 6 to the new positions shown in Figure 8.
To show exit cross sections 11 of the poles 10 that can be used in accordance with the invention, Figure 9 shows a selection of various possible exit cross sections 11. The exit cross sections 11 are shown with the primary axis 12 of the exit cross section 11 indicated. The upper row of drawings shows assumed initial positions, and the lower row shows the end positions obtained by rotation in direction of rotation 19 by a certain angular amount. In detail, the following exit cross sections are shown from left to right:
- rectangular exit cross section 11a, triangular exit cross section ilb, polygonal exit cross section llc, and - oval exit cross section lid.
List of Reference Numbers and Letters 1 mold 2 mold dip tube 3 mold broad side 4 vertical reference line of the mold dip tube principal flow direction of the dip tube flow 6 outlet of the mold dip tube pole 11a_e exit cross section of the pole 12 primary axis of the exit cross section of the poles 13 magnetic coils 14 core 14' yoke magnetic field lines 16 point of intersection above the poles 17 point of intersection below the poles 18 direction of rotation (clockwise) 19 direction of rotation (counterclockwise) point of rotation al angle between the vertical reference line of the mold dip tube and the primary axis in the exit cross section of the poles with the intersection located above the poles 92 angle between the vertical reference line of the mold dip tube and the primary axis in the exit cross section of the poles with the intersection located below the poles
Finally, DE 602 19 062 T2 describes a device for casting metals, wherein magnetic elements comprising magnetic cores and electric conductor windings are arranged along each longitudinal side of the mold. These magnetic elements generate a magnetic field by an applied polyphase alternating voltage. This arrangement of magnetic elements makes it possible to control the movement of the molten material near the upper surface in the end regions and to brake the downward movement of the molten cast.
Proceeding from the prior art described above, the objective of the invention is to specify an arrangement and alignment for the poles of the electromagnetic braking systems by which it is possible to achieve direct control of the flow of the molten steel from the dip tube of the mold.
This objective is achieved with the characterizing features of Claim 1. To achieve direct electromagnetic control of the streams of liquid emerging from the mold dip tube, at least two poles on each broad side of the mold are arranged symmetrically to the vertical reference line of the mold dip tube, such that the primary axes of the exit cross sections of the poles are suitably aligned at a certain angle al and a2.
As a result of the alignment of the poles of the electromagnetic braking device in the primary flow direction of the dip tube flow, the electromagnetic braking device directly controls, as a locally acting field, the streams of liquid emerging from the mold dip tube with respect to their direction, their velocity profile, and their turbulence structure. As a result of the liquid streams modified in this way, the development of detrimental velocity fluctuations in the bath surface are advantageously limited and can thus be controlled. The results that can be achieved in this way include low turbulence in the bath surface, fewer undesirable inclusions of, for example, casting flux or slag, and a homogeneous temperature distribution, and thus all together improved quality of the cast products and an increase in the casting rate.
Due to the concentrated effect of the design and arrangement, in accordance with the invention, of the poles of the electromagnetic braking device on the dip tube flow, the power requirement of the braking device is very low and amounts to only about 1/ to '- of the electric power that it would otherwise be necessary to supply, and, in addition, it is not necessary to adapt the braking device as a function of the format width, but rather it is only necessary to provide for adjustment of the field strength as a function of the throughput.
In this connection, the braking device is operated basically with a permanent field and adjustable field strength by means of direct current; but operation with alternating field strength and possible reversal by means of alternating current is an alternative possibility.
The poles of the electromagnetic braking device of the invention have any desired exit cross section with the formation of a primary axis. This exit cross section can be formed, for example, as a triangle, rectangle, any desired polygon, or with a curved contour.
In accordance with the invention, the primary axes are aligned in a well-defined way, such that the primary axes of the poles intersect the vertical reference line of the mold dip tube above the poles at an angle al of 1 to 89 or, alternatively, below the poles at an angle a2 of 1 to 89 .
The angles al and a2 are manually set by rotation of the poles before operation of the continuous casting installation, or, in accordance with another embodiment of the invention, they are variably adjusted by motorized rotation of the poles during the operation of the continuous casting plant and then changed as required, where the motorized adjustment of the angles is accomplished, for example, by means of a motor, a hydraulic rotary drive, or a hydraulic or pneumatic cylinder.
The possible centers of rotation of the poles preferably lie on their primary axes, but, alternatively, they can also be arranged outside the poles, depending on the geometric realization of the poles.
In one possible embodiment of the invention, the electromagnetic braking device with coils, cores and yoke is positioned directly on the mold, so that it oscillates together with the mold during the operation of the continuous casting installation.
In another possible embodiment of the invention, the electromagnetic braking device is permanently mounted separate from the mold, so that in this case it does not oscillate together with the mold.
Finally, it is also possible to divide the electromagnetic braking device into separate parts, with, for example, the ends of the poles being arranged on the mold, and the coils, the split core, and the yoke being positioned on the stationary machine structure.
Further advantages and details of the invention are more fully explained below with reference to the specific embodiments illustrated in the accompanying schematic drawings.
-- Figure 1 shows a perspective view of a mold with an electromagnetic braking device.
-- Figure 2 shows a cross-sectional side view of a mold for thick slabs with an electromagnetic braking device.
-- Figure 3 shows a cross-sectional side view of a mold for thin slabs with an electromagnetic braking device.
-- Figures 4 and 5 show the mold of Figure 2 with rotatable poles in different angular positions.
-- Figures 6 to 8 show the mold with rotatable poles in different angular positions with an alternative pole design.
-- Figure 9 shows examples of pole designs with the primary axis indicated.
Figure 1 shows a perspective view of the mold 1 of a continuous casting installation with an electromagnetic braking device arranged in the lower region of the mold dip tube 2. The electromagnetic braking device, which consists of the cores 14, the yokes 14', and the magnetic coils 13, is arranged in such a way in accordance with the invention that two poles 10 are positioned opposite each other on each broad side 3 of the mold. They are aligned symmetrically to the vertical reference line 4 of the mold dip tube 2 relative to the principal flow direction of the dip tube flow, so that the primary axes 12 of the exit cross sections of the poles intersect this reference line 4 at a certain angle al. As a result of the reference of the alignment of the poles 10 to the principal flow direction of the dip tube flow, the streams of liquid flowing into the mold 1 are controlled in a direct way by the magnetic field lines created between the poles 10.
The principal flow direction of the dip tube flow, which is not shown in the perspective view of Figure 1, is shown in the cross-sectional side views of Figures 2 to 5.
Figure 2 shows a mold 1 for thick slabs with the principal flow direction 5 of the dip tube flow emerging laterally from the mold dip tube 2 at about right angles.
Corresponding to this principal flow direction 5, a pole 10 is arranged on each side in the lower region of the mold dip tube 2 in such a way that the primary axes 12 of the exit cross section lla of each pole 10 intersects the vertical reference line 4 of the mold dip tube 2 at an angle a. Since the point of intersection is located above the poles 10, this angle is denoted al.
Figure 3 shows a mold 1 for thin slabs with the principal flow direction 5 of the dip tube flow emerging laterally from the mold dip tube 2 at an angle of about 45 . The arrangement of the poles 10 with respect to this principal flow direction is changed from that of Figure 2 in that the point of intersection of the primary axes 12 of the exit cross section lla of each pole 10 with the vertical reference line 4 of the mold dip tube 2 is now located below the poles 10, and for this reason the angle of intersection is denoted a2 to distinguish it from al.
Figures 4 and 5 show an alternative realization of an electromagnetic braking device for a thick slab mold 1 of the type illustrated in Figure 2 for adaptation to altered conditions of the streams of liquid emerging from the mold dip tube 2. The poles 10 of this embodiment are designed to rotate clockwise 18 or counterclockwise 19 about a point of rotation 20 that lies on the primary axes 12 of the exit cross section 11a. In Figure 5, the two poles 10 were rotated clockwise 18 or counterclockwise 19 from their original positions in Figure 4. This caused the original angle al in Figures 2 and 4 to increase to a new value all in Figure 5.
Figures 6 to 8 show examples of possible rotations of the poles 10. The poles 10, which are formed with a curved contour of their exit cross sections 11e, are arranged symmetrically to the vertical reference line 4 of the mold dip tube 2 in the region of the outlet 6 of the mold dip tube 2.
Figure 6 shows an assumed initial position. The initial position of the poles 10 shown in Figure 6 was changed to the position shown in Figure 7 by rotating the left pole 10 inward in direction of rotation 18, i.e., clockwise, and rotating the right pole 10 inward in the opposite direction of rotation 19 by an angular amount of 5 in each case. Rotation of the poles 10 outward in the opposite directions by an angular amount of 20 changes the positions of the poles 10 from their initial positions shown in Figure 6 to the new positions shown in Figure 8.
To show exit cross sections 11 of the poles 10 that can be used in accordance with the invention, Figure 9 shows a selection of various possible exit cross sections 11. The exit cross sections 11 are shown with the primary axis 12 of the exit cross section 11 indicated. The upper row of drawings shows assumed initial positions, and the lower row shows the end positions obtained by rotation in direction of rotation 19 by a certain angular amount. In detail, the following exit cross sections are shown from left to right:
- rectangular exit cross section 11a, triangular exit cross section ilb, polygonal exit cross section llc, and - oval exit cross section lid.
List of Reference Numbers and Letters 1 mold 2 mold dip tube 3 mold broad side 4 vertical reference line of the mold dip tube principal flow direction of the dip tube flow 6 outlet of the mold dip tube pole 11a_e exit cross section of the pole 12 primary axis of the exit cross section of the poles 13 magnetic coils 14 core 14' yoke magnetic field lines 16 point of intersection above the poles 17 point of intersection below the poles 18 direction of rotation (clockwise) 19 direction of rotation (counterclockwise) point of rotation al angle between the vertical reference line of the mold dip tube and the primary axis in the exit cross section of the poles with the intersection located above the poles 92 angle between the vertical reference line of the mold dip tube and the primary axis in the exit cross section of the poles with the intersection located below the poles
Claims (17)
1. A method for casting liquid metals to produce slab and thin-slab products with format widths of 750 to 3,500 mm and format thicknesses of 30 to 500 mm in a continuous casting installation, which, for the purpose of achieving improved product quality, is equipped with an electromagnetic braking device that consists of coils (13) with cores (14) and a yoke (14'), by whose generated magnetic field effect the flow conditions within the liquid metal in the mold (1) are controlled, characterized in that to achieve direct electromagnetic control of the streams of liquid emerging from the mold dip tube (2), at least two poles (10) are arranged opposite each other with mirror symmetry on each broad side (3) of the mold (1) and at least two poles (10) are arranged symmetrically to the vertical reference line (4) of the mold dip tube (2) on each broad side (3) of the mold (1), such that the primary axes (12) of the exit cross sections (11 a-e) of the poles (10) are aligned at an angle .alpha. or .alpha.2 of 1° to 89° .....
to the principal flow direction (5) of the dip tube flow.
to the principal flow direction (5) of the dip tube flow.
2. A method in accordance with claim 1, characterized in that the primary axes (12) are aligned in a well-defined way, such that the primary axes (12) of the poles (10) intersect the vertical reference line (4) of the mold dip tube (2) above the poles (10) at an angle (.alpha.1) of 1° to 89° or, alternatively, below the poles (5) at an angle (.alpha.2) of 1° to 89°.
3. A method in accordance with claim 2, characterized in that the angles (.alpha.1, .alpha.2) are manually set by rotation of the poles (10) before operation of the continuous casting installation.
4. A method in accordance with claim 2, characterized in that the angles (.alpha.1 and .alpha.2) are variably adjusted by manual or motorized rotation of the poles (10) during the operation of the continuous casting plant and changed as required.
5. A method in accordance with claim 1, claim 2, claim 3, or claim 4, characterized in that the field strength of the braking device is adjusted as a function of the throughput of the mold (1).
6. A method in accordance with one or more of claims 1 to 5, characterized in that the braking device is operated with a permanent field and adjustable field strength by means of direct current.
7. A method in accordance with one or more of claims 1 to 5, characterized in that the braking device is operated with alternating field strength and possible reversal by means of alternating current.
8. A mold (1) of a continuous casting installation for casting liquid metals to produce slab and thin-slab products with format widths of 750 to 3,500 mm and format thicknesses of 30 to 500 mm, which, for the purpose of achieving improved product quality, is equipped with an electromagnetic braking device that consists of coils (13) with cores (14) and a yoke (14'), by whose generated magnetic field effect the flow conditions within the liquid metal in the mold (1) are controlled, in accordance with claims 1 to 7, characterized in that at least two poles (10) are arranged opposite each other with mirror symmetry on each broad side (3) of the mold (1), and that at least two poles (10) are arranged symmetrically to the vertical reference line (4) of the mold dip tube (2) on each broad side (3) of the mold (1) in such a way that the direction of the primary axes (12) of the exit cross sections (11 a-e) of the poles (10) largely corresponds to the principal flow directions (5) of the dip tube flow, and in this connection the primary axes (12) intersect the vertical reference line (4) of the mold dip tube (2) above the poles (10) at an angle (.alpha.1) of 1° to 89° or, alternatively, below the poles (10) at an angle (.alpha.2) of 1° to 89°.
9. A mold (1) in accordance with claim 8, characterized in that the poles (10) are designed with various exit cross sections such as a triangle, rectangle, any desired polygon, or with a curved contour, which are formed with a primary axis (12).
10. A mold (1) in accordance with claim 8 or claim 9, characterized in that the poles (10) are aligned in a stationary geometric arrangement on the mold (1) at an angle (.alpha.1, .alpha.2) to the vertical reference line (4) of the mold dip tube (2).
11. A mold (1) in accordance with claim 8 or claim 9, characterized in that the poles (10) are designed to be suitably rotatable for manual or motorized adjustment of the angle (.alpha.1 or .alpha.2) before or during operation of the continuous casting installation.
12. A mold (1) in accordance with claim 11, characterized in that the motorized adjustment of the angles is accomplished, for example, by means of a motor, a hydraulic rotary drive, or a hydraulic or pneumatic cylinder.
13. A mold (1) in accordance with claim 11 or claim 12, characterized in that a possible center of rotation (20) of the pole (10) lies on its primary axis (12).
14. A mold (1) in accordance with claim 11 or claim 12, characterized in that a possible center of rotation (20) lies outside the pole (10).
15. A mold (1) in accordance with one or more of claims 8 to 14, characterized in that the electromagnetic braking device with magnetic coils (13), cores (14) and yoke (141) is positioned directly on the mold (1) and oscillates together with the mold (1) during the operation of the continuous casting installation.
16. A mold (1) in accordance with one or more of claims 8 to 14, characterized in that the electromagnetic braking device is permanently mounted separate from the mold (1) and does not oscillate together with the mold (1).
17. A mold (1) in accordance with one or more of claims 8 to 14, characterized in that the electromagnetic braking device is divided into separate parts in such a way that the ends of the poles are arranged on the mold (1), and the magnetic coils, the core (14), and the yoke (14') are positioned on the stationary machine structure.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008033075.2 | 2008-07-15 | ||
| DE102008033075 | 2008-07-15 | ||
| DE102009029889.4 | 2009-06-23 | ||
| DE102009029889A DE102009029889A1 (en) | 2008-07-15 | 2009-06-23 | Electromagnetic brake device on continuous casting molds |
| PCT/EP2009/005129 WO2010006773A1 (en) | 2008-07-15 | 2009-07-15 | Electromagnetic braking device on continuous casting molds |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2730616A1 true CA2730616A1 (en) | 2010-01-21 |
Family
ID=41528313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2730616A Abandoned CA2730616A1 (en) | 2008-07-15 | 2009-07-15 | Electromagnetic braking device on continuous casting molds |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20110162817A1 (en) |
| EP (1) | EP2326441B1 (en) |
| JP (1) | JP5236806B2 (en) |
| KR (2) | KR20130075785A (en) |
| CN (1) | CN102099136B (en) |
| CA (1) | CA2730616A1 (en) |
| DE (1) | DE102009029889A1 (en) |
| RU (1) | RU2468886C2 (en) |
| WO (1) | WO2010006773A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825245A (en) * | 2011-06-14 | 2012-12-19 | 鞍钢股份有限公司 | Helical electromagnetic stirring device |
| CN113102704A (en) * | 2021-04-12 | 2021-07-13 | 郭之珩 | Electromagnetic stirring device and electromagnetic stirring processing method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT507590A1 (en) † | 2008-11-20 | 2010-06-15 | Siemens Vai Metals Tech Gmbh | METHOD AND CONTINUOUS CASTING SYSTEM FOR MANUFACTURING THICK BRAMMS |
| DE102009056001A1 (en) | 2009-08-28 | 2011-03-03 | Sms Siemag Ag | Method of pouring liquid metals |
| WO2020187551A1 (en) * | 2019-03-18 | 2020-09-24 | Primetals Technologies Austria GmbH | Electromagnetic brake for a mold of a slab continuous casting assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE667795A (en) * | 1964-07-10 | |||
| SE436251B (en) * | 1980-05-19 | 1984-11-26 | Asea Ab | SET AND DEVICE FOR MOVING THE NON-STANDED PARTS OF A CASTING STRING |
| EP0045938A1 (en) * | 1980-08-11 | 1982-02-17 | Concast Holding Ag | Method and apparatus for stirring a strand having a rectangular cross-section in a continuous-casting installation |
| KR850001783B1 (en) * | 1984-01-12 | 1985-12-18 | 이승제 | Manufacturing method of chalk |
| SU1675033A1 (en) * | 1988-04-04 | 1991-09-07 | Всесоюзный научно-исследовательский и проектно-конструкторский институт металлургического машиностроения им.А.И.Целикова | Method of electromagnetic stirring of liquid phase of a continuously cast ingot |
| SE501322C2 (en) * | 1993-01-19 | 1995-01-16 | Asea Brown Boveri | Device for injection molding in mold |
| JPH0819841A (en) * | 1994-07-04 | 1996-01-23 | Nkk Corp | Continuous casting method |
| DE19533577C1 (en) * | 1995-08-29 | 1996-10-24 | Mannesmann Ag | Electromagnetic system for continuous casting mould |
| EP0832704A1 (en) * | 1996-09-19 | 1998-04-01 | Hoogovens Staal B.V. | Continuous casting machine |
| KR100376504B1 (en) * | 1998-08-04 | 2004-12-14 | 주식회사 포스코 | Continuous casting method and continuous casting apparatus used |
| SE515990C2 (en) | 1999-09-03 | 2001-11-05 | Abb Ab | Device for continuous or semi-continuous casting of metals |
| SE523881C2 (en) | 2001-09-27 | 2004-05-25 | Abb Ab | Device and method of continuous casting |
| DE10237188A1 (en) | 2002-08-14 | 2004-02-26 | Sms Demag Ag | Electromagnetic braking device for steel melts flowing into a continuous casting mold, comprises a magnetic coil having a core consisting of a main part receiving a magnetic coil and travelling toward the wide side walls of a mold |
| US7984749B2 (en) * | 2003-12-18 | 2011-07-26 | Sms Siemag Ag | Magnetic device for continuous casting mold |
| KR20060120022A (en) * | 2003-12-18 | 2006-11-24 | 에스엠에스 데마그 악티엔게젤샤프트 | Magnetic brake for continuous casting moulds |
| DE102004046729A1 (en) | 2003-12-18 | 2005-07-14 | Sms Demag Ag | Continuous casting mold, especially a thin slab mold, used in the continuous casting of metals comprises permanent magnets which give a varying filed strength using differing magnet strengths over the width and/or height |
-
2009
- 2009-06-23 DE DE102009029889A patent/DE102009029889A1/en not_active Withdrawn
- 2009-07-15 RU RU2011105386/02A patent/RU2468886C2/en not_active IP Right Cessation
- 2009-07-15 WO PCT/EP2009/005129 patent/WO2010006773A1/en active Application Filing
- 2009-07-15 US US13/054,253 patent/US20110162817A1/en not_active Abandoned
- 2009-07-15 KR KR1020137013964A patent/KR20130075785A/en not_active Application Discontinuation
- 2009-07-15 CN CN200980127917.5A patent/CN102099136B/en not_active Expired - Fee Related
- 2009-07-15 KR KR1020117002222A patent/KR20110025992A/en active Search and Examination
- 2009-07-15 CA CA2730616A patent/CA2730616A1/en not_active Abandoned
- 2009-07-15 EP EP09777198.4A patent/EP2326441B1/en active Active
- 2009-07-15 JP JP2011517806A patent/JP5236806B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825245A (en) * | 2011-06-14 | 2012-12-19 | 鞍钢股份有限公司 | Helical electromagnetic stirring device |
| CN102825245B (en) * | 2011-06-14 | 2015-07-08 | 鞍钢股份有限公司 | Helical electromagnetic stirring device |
| CN113102704A (en) * | 2021-04-12 | 2021-07-13 | 郭之珩 | Electromagnetic stirring device and electromagnetic stirring processing method |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2326441A1 (en) | 2011-06-01 |
| RU2468886C2 (en) | 2012-12-10 |
| CN102099136A (en) | 2011-06-15 |
| KR20130075785A (en) | 2013-07-05 |
| EP2326441B1 (en) | 2016-12-07 |
| JP2011527942A (en) | 2011-11-10 |
| KR20110025992A (en) | 2011-03-14 |
| JP5236806B2 (en) | 2013-07-17 |
| RU2011105386A (en) | 2012-08-20 |
| WO2010006773A1 (en) | 2010-01-21 |
| DE102009029889A1 (en) | 2010-02-18 |
| CN102099136B (en) | 2014-07-02 |
| US20110162817A1 (en) | 2011-07-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |
Effective date: 20161229 |