CN116213664A - Continuous casting two-cold-zone sectional roller type multi-mode electromagnetic stirring flow control device - Google Patents
Continuous casting two-cold-zone sectional roller type multi-mode electromagnetic stirring flow control device Download PDFInfo
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- CN116213664A CN116213664A CN202310304195.8A CN202310304195A CN116213664A CN 116213664 A CN116213664 A CN 116213664A CN 202310304195 A CN202310304195 A CN 202310304195A CN 116213664 A CN116213664 A CN 116213664A
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- 238000003756 stirring Methods 0.000 title claims abstract description 119
- 238000009749 continuous casting Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 230000006698 induction Effects 0.000 claims abstract description 4
- 238000010992 reflux Methods 0.000 claims description 51
- 230000009471 action Effects 0.000 claims description 19
- 230000005672 electromagnetic field Effects 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 3
- 238000000819 phase cycle Methods 0.000 claims description 3
- 230000006872 improvement Effects 0.000 abstract description 7
- 238000007711 solidification Methods 0.000 abstract description 6
- 230000008023 solidification Effects 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 abstract description 3
- 230000005012 migration Effects 0.000 abstract description 3
- 238000013508 migration Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 description 7
- 238000005204 segregation Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields
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Abstract
The continuous casting two-cold-zone sectional roller type multi-mode electromagnetic stirring flow control device comprises two pairs of electromagnetic stirring rollers which are arranged in parallel, wherein each pair of electromagnetic stirring rollers comprises an electromagnetic stirring upper roller and a lower roller, a slab is positioned between the two pairs of electromagnetic stirring rollers, and a gap is reserved between the slab and the upper roller and between the slab and the lower roller; the electromagnetic stirring upper roller and the electromagnetic stirring lower roller have the same structure, each roller adopts a sectional roller body structure, the number of roller body sections is four, each roller body section comprises an iron core and coils, the coils are coaxially wound on the iron core, insulating sheets are arranged between adjacent coils, and all the coils are provided with cooling devices. The invention generates a constant alternating magnetic field through the electrified coil, and forms induction current in molten steel, thereby generating electromagnetic force, wherein the electromagnetic force acts on the molten steel, promotes the fluidity of the molten steel in the blank shell, drives heat transmission and solute migration, realizes the expansion of an equiaxed crystal area, the uniformity of solute components, the improvement of loose shrinkage cavity, the improvement of solidification hysteresis and the reduction of the generation of Bai Liangdai, and improves the quality of wide and thick slabs.
Description
Technical Field
The invention belongs to the technical field of steelmaking continuous casting, and particularly relates to a continuous casting two-cold-zone sectional roll type multi-mode electromagnetic stirring flow control device.
Background
As global continuous casting ratios and slab yields rise year by year, market demands for "variety type" and "quality type" of slabs are increasing. The development of defect-free high-efficiency continuous casting is an important way for realizing the low-carbon green development of a slab production line. Because of the specificity of the slab in the thickness direction, the defects of center segregation, looseness, cracks and the like are always recognized quality problems which are most difficult to control in continuous casting production, and the efficient production of the slab is severely restricted.
The secondary cooling zone traveling wave electromagnetic stirring technology has the advantages of high density, cleanliness, controllability and the like, belongs to clean energy, can realize non-contact influence on the atomic and molecular dimensions of molten steel, and can obviously influence the physical and chemical processes of melt flow, temperature distribution, solute enrichment, grain nucleation, growth and the like in the molten steel solidification process through the interaction force among a plurality of magnets such as Lorentz force, magnetic force and the like, thereby controlling and improving the structure of a wide and thick slab.
However, the electromagnetic stirring technology used in the current steel factories at home and abroad is given by equipment manufacturers, and the electromagnetic stirring parameters cannot be adjusted according to the change of the section size and the technological parameters of the slab. Practice proves that the best effect can be achieved only by using different stirring parameters aiming at different section sizes and technological parameters, otherwise, slab defects such as center segregation phenomenon, frame segregation phenomenon, white-bright-strip negative segregation phenomenon, solidification hysteresis phenomenon and the like are easy to occur, and the qualification rate of product flaw detection is seriously affected.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a continuous casting two-cold-zone sectional roll type multi-mode electromagnetic stirring flow control device, which generates a constant alternating magnetic field through a power-on coil to generate induced current in molten steel so as to generate electromagnetic force which acts on the molten steel to promote the fluidity of the molten steel in a billet shell and drive heat transmission and solute migration, thereby realizing the expansion of an equiaxed crystal zone, the uniformity of solute components, the improvement of loosening shrinkage cavity, the improvement of solidification hysteresis and the reduction of the generation of Bai Liangdai, and improving the quality of wide and thick slabs.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the continuous casting secondary cooling zone sectional roller type multi-mode electromagnetic stirring flow control device comprises two pairs of electromagnetic stirring rollers, wherein the two pairs of electromagnetic stirring rollers are arranged in parallel, each pair of electromagnetic stirring rollers comprises an electromagnetic stirring upper roller and an electromagnetic stirring lower roller, a slab is positioned between the two pairs of electromagnetic stirring rollers, and a gap is reserved between the slab and each electromagnetic stirring upper roller and each electromagnetic stirring lower roller; the electromagnetic stirring upper roller and the electromagnetic stirring lower roller are identical in structure, each roller adopts a sectional roller body structure, the number of roller body sections is four, each roller body section comprises an iron core and coils, the coils are coaxially wound on the iron core, insulating sheets are arranged between adjacent coils, and all the coils are provided with cooling devices.
The coil is externally coated with a magnetic shielding sleeve, the cross section of the magnetic shielding sleeve is C-shaped, and a C-shaped opening of the magnetic shielding sleeve faces to the plate blank.
The iron core adopts a cylindrical structure.
The maximum magnetic induction intensity of the center of the slab is not lower than 0.08T.
The number of turns of the coil is 0-88, and the coil is made of round or flat copper wires.
Different coil windings on the same iron core adopt different initial phases of current, the same current frequency is introduced, and the energizing mode adopts a pulse mode.
The coil is required to be connected with U, V two-phase alternating current, the phase angle of the connected alternating current is 0-90 degrees, the current is 0-800A, and the frequency is 0-100 Hz; when the coil is connected with alternating current, an alternating electromagnetic field is excited, and the alternating electromagnetic field gradually permeates into the plate blank, so that the flow of molten steel in the plate blank is promoted by electromagnetic force; electromagnetic forces of different modes are generated by changing the current phase sequence.
When the section size of the slab is smaller than 1000mm, only starting two middle roller bodies of the electromagnetic stirring upper roller and the electromagnetic stirring lower roller, wherein the electromagnetic force direction of the two middle roller bodies of the electromagnetic stirring upper roller is in a right-left mode, the electromagnetic force direction of the two middle roller bodies of the electromagnetic stirring lower roller is in a left-right mode, and six reflux areas are formed in the slab after the slab enters an action area of the roller bodies, wherein two reflux areas are respectively formed in the middle area and the two end areas in the slab; or the electromagnetic force direction of the middle two sections of roller bodies of the electromagnetic stirring upper roller is in a right-left mode, the electromagnetic force direction of the middle two sections of roller bodies of the electromagnetic stirring lower roller is in a right-left mode, after a plate blank enters the action zone of the roller bodies, eight reflux areas are formed in the plate blank, wherein four reflux areas are formed in the middle area in the plate blank, and two reflux areas are formed in the two end areas respectively.
When the section size of the slab is 1000 mm-1800 mm, starting all four sections of roller bodies of an electromagnetic stirring upper roller and an electromagnetic stirring lower roller, wherein the electromagnetic force direction of all four sections of roller bodies of the electromagnetic stirring upper roller adopts a right-left mode, the electromagnetic force direction of all four sections of roller bodies of the electromagnetic stirring lower roller adopts a right-left mode, and eight reflux areas are formed in the slab after the slab enters an action area of the roller bodies, wherein two reflux areas are respectively formed in a middle area and a rear end area in the slab, and four reflux areas are formed in a front end area of the slab; or the electromagnetic force directions of all four roller bodies of the electromagnetic stirring upper roller are in a right-left-right mode, the electromagnetic force directions of all four roller bodies of the electromagnetic stirring lower roller are in a left-right-left mode, and after a plate blank enters the action zone of the roller bodies, twelve backflow zones are formed in the plate blank, wherein four backflow zones are formed in the middle zone and the two end zones in the plate blank respectively.
When the section size of the slab is larger than 1800mm, starting all four sections of roller bodies of an electromagnetic stirring upper roller and an electromagnetic stirring lower roller, wherein the electromagnetic force direction of all four sections of roller bodies of the electromagnetic stirring upper roller adopts a right-left mode, the electromagnetic force direction of all four sections of roller bodies of the electromagnetic stirring lower roller adopts a right-left mode, seven reflux areas are formed in the slab after the slab enters an action area of the roller bodies, a reflux area is formed in a range of 3/4 from the left of the rear end area in the slab, a reflux area is formed in a range of 1/4 from the right of the rear end area in the slab, a reflux area is formed in a range of 1/4 from the left of the middle area in the slab, two reflux areas are formed in a range of 1/4 from the left of the front end area in the slab, and a reflux area is formed in a range of 3/4 from the right of the front end area in the slab; or the electromagnetic force directions of all four roller bodies of the electromagnetic stirring upper roller are in a right-left mode, the electromagnetic force directions of all four roller bodies of the electromagnetic stirring lower roller are in a left-right mode, six backflow areas are formed in the plate blank after the plate blank enters the action area of the roller bodies, one backflow area is formed in the range of 3/4 of the left end area of the inner rear end area of the plate blank, one backflow area is formed in the range of 1/4 of the right end area of the inner front end area of the plate blank, one backflow area is formed in the range of 1/4 of the right end area of the inner middle area of the plate blank, one backflow area is formed in the range of 3/4 of the left end area of the inner front end area of the plate blank, and one backflow area is formed in the range of 1/4 of the right end area of the inner front end area of the plate blank.
The invention has the beneficial effects that:
the continuous casting secondary cooling zone sectional roller type multi-mode electromagnetic stirring flow control device generates a constant alternating magnetic field through the electrified coil, and forms induced current in molten steel so as to generate electromagnetic force, wherein the electromagnetic force acts on the molten steel, promotes the fluidity of the molten steel in a billet shell, and drives heat transmission and solute migration, thereby realizing the expansion of an equiaxed crystal zone, the uniformity of solute components, the improvement of loose shrinkage cavity, the improvement of solidification hysteresis, the reduction of the generation of Bai Liangdai and the improvement of the quality of a wide and thick slab.
The continuous casting secondary cooling zone sectional roller type multi-mode electromagnetic stirring flow control device can generate electromagnetic force perpendicular to the slab drawing speed direction, and the electromagnetic force of the type can promote molten steel in a multi-section slab to generate multi-mode flow so as to strengthen heat convection; meanwhile, compared with the traditional secondary cooling area electromagnetic stirrer, the electromagnetic force action area is larger, so that the production place high-quality slab is more facilitated from the metallurgical effect, and sufficient freedom degree can be provided for continuous casting production operation; in addition, the risk of steel leakage can be minimized, the appearance of the solidification end is modified, and center segregation and frame segregation are reduced.
Drawings
FIG. 1 is a schematic structural view of a continuous casting two-cold-zone sectional roll type multi-mode electromagnetic stirring flow control device;
FIG. 2 is a schematic diagram of a winding mode of a coil winding of a continuous casting two-cold-zone sectional roll type multimode electromagnetic stirring flow control device;
FIG. 3 is a schematic exploded view of the electromagnetic stirring upper/lower roller of the present invention;
FIG. 4 is a graph showing the flow field direction and electromagnetic force distribution when the cross-sectional dimension of the blank is less than 1000mm (scheme one);
FIG. 5 is a graph showing the flow field direction and electromagnetic force distribution when the cross-sectional dimension of the blank is less than 1000mm (scheme II);
FIG. 6 is a graph showing the flow field direction and electromagnetic force distribution when the cross-sectional dimension of the slab is 1000mm to 1800mm (scheme one);
FIG. 7 is a graph showing the flow field direction and electromagnetic force distribution when the cross-sectional dimension of the slab is 1000mm to 1800mm (scheme II);
FIG. 8 is a graph of flow field direction and electromagnetic force distribution when the cross-sectional dimension of the slab is greater than 1800mm (scheme one);
FIG. 9 is a graph of flow field direction and electromagnetic force distribution for a slab having a cross-sectional dimension greater than 1800mm (scheme II);
in the figure, 1-electromagnetic stirring upper roller, 2-electromagnetic stirring lower roller, 3-plate blank, 4-iron core, 5-coil and 6-magnetic shielding sleeve.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
As shown in fig. 1-3, the continuous casting secondary cooling zone sectional roller type multi-mode electromagnetic stirring flow control device comprises two pairs of electromagnetic stirring rollers, wherein the two pairs of electromagnetic stirring rollers are arranged in parallel, each pair of electromagnetic stirring rollers comprises an electromagnetic stirring upper roller 1 and an electromagnetic stirring lower roller 2, a plate blank 3 is positioned between the two pairs of electromagnetic stirring rollers, and a gap is reserved between the plate blank 3 and each electromagnetic stirring upper roller 1 and each electromagnetic stirring lower roller 2; the electromagnetic stirring upper roller 1 and the electromagnetic stirring lower roller 2 are identical in structure, each roller adopts a sectional roller body structure, the number of roller body sections is four, each roller body section comprises an iron core 4 and coils 5, the coils 5 are coaxially wound on the iron cores 4, insulating sheets are arranged between adjacent coils 5, and all the coils 4 are provided with cooling devices.
The coil 5 is externally coated with a magnetic shielding sleeve 6, the cross section of the magnetic shielding sleeve 6 is C-shaped, and a C-shaped opening of the magnetic shielding sleeve 6 faces the slab 3.
The iron core 4 adopts a cylindrical structure.
The maximum magnetic induction intensity of the center of the slab 3 is not less than 0.08T.
The number of turns of the coil 5 is 0-88, and the coil 5 is made of round or flat copper wires.
The coil 5 is required to be connected with U, V two-phase alternating current, the phase angle of the connected alternating current is 0-90 degrees, the current is 0-800A, and the frequency is 0-100 Hz; when the coil 5 is connected with alternating current, an alternating electromagnetic field is excited, and the alternating electromagnetic field gradually permeates into the plate blank 3, so that the flow of molten steel in the plate blank 3 is promoted by electromagnetic force; electromagnetic force with different modes is generated by changing the current phase sequence, so that the on-site actual regulation and control are facilitated.
When the section size of the slab 3 is smaller than 1000mm, only starting two middle roller bodies of the electromagnetic stirring upper roller 1 and the electromagnetic stirring lower roller 2, wherein the electromagnetic force direction of the two middle roller bodies of the electromagnetic stirring upper roller 1 is in a right-left mode, the electromagnetic force direction of the two middle roller bodies of the electromagnetic stirring lower roller 2 is in a left-right mode, and six reflux areas are formed in the slab 3 after the slab 3 enters an action area of the roller bodies, wherein two reflux areas are respectively formed in the middle area and the two end areas in the slab 3, as shown in fig. 4; or the electromagnetic force direction of the middle two sections of roller bodies of the electromagnetic stirring upper roller 1 is in a right-left mode, the electromagnetic force direction of the middle two sections of roller bodies of the electromagnetic stirring lower roller 2 is in a right-left mode, when the plate blank 3 enters the action zone of the roller bodies, eight reflux areas are formed inside the plate blank 3, wherein four reflux areas are formed in the middle area inside the plate blank 3, and two reflux areas are formed in the two end areas respectively, as shown in fig. 5; and the formed reflux zone fully drives a solute field in the molten steel to be reasonably distributed.
When the section size of the slab 3 is 1000 mm-1800 mm, all four sections of roller bodies of the electromagnetic stirring upper roller 1 and the electromagnetic stirring lower roller 2 are started, the electromagnetic force direction of all four sections of roller bodies of the electromagnetic stirring upper roller 1 adopts a right-left mode, the electromagnetic force direction of all four sections of roller bodies of the electromagnetic stirring lower roller 2 adopts a right-left mode, eight reflux areas are formed inside the slab 3 after the slab 3 enters the action area of the roller bodies, wherein two reflux areas are respectively formed in the middle area and the rear end area inside the slab 3, and four reflux areas are formed in the front end area of the slab, as shown in fig. 6; or, the electromagnetic force directions of all four roller bodies of the electromagnetic stirring upper roller 1 are in a right-left-right mode, the electromagnetic force directions of all four roller bodies of the electromagnetic stirring lower roller 2 are in a left-right-left mode, after the plate blank 3 enters the action zone of the roller bodies, twelve reflux zones are formed inside the plate blank 3, wherein four reflux zones are formed in the middle area and the two end areas inside the plate blank 3 respectively, as shown in fig. 7; with the increase of the number of the flow-back areas, the grading control effect of molten steel in each area is better, and the control of segregation and white and bright bands becomes a key point through the fragmentation rationalization control of the electromagnetic stirring roller.
When the section size of the slab 3 is larger than 1800mm, starting all four roller bodies of the electromagnetic stirring upper roller 1 and the electromagnetic stirring lower roller 2, wherein the electromagnetic force direction of all four roller bodies of the electromagnetic stirring upper roller 1 adopts a right-left mode, the electromagnetic force direction of all four roller bodies of the electromagnetic stirring lower roller 2 adopts a right-left mode, after the slab 3 enters an action zone of the roller bodies, seven reflux areas are formed in the slab 3, a reflux area is formed in a range of 3/4 from the left end area in the interior of the slab 3, a reflux area is formed in a range of 1/4 from the right end area in the interior of the slab 3, two reflux areas are formed in a range of 1/4 from the right end area in the interior of the slab 3, a reflux area is formed in a range of 1/4 from the right end area in the interior of the front end area in the slab 3, and as shown in fig. 8, and the mode is suitable for steel types with higher solute components; or, the electromagnetic force directions of all four roller bodies of the electromagnetic stirring upper roller 1 adopt a right-left mode, the electromagnetic force directions of all four roller bodies of the electromagnetic stirring lower roller 2 adopt a left-right mode, six reflux areas are formed in the plate blank 3 after the plate blank 3 enters an action area of the roller bodies, a reflux area is formed in a range of 3/4 from the left of the rear end area in the plate blank 3, a reflux area is formed in a range of 1/4 from the right of the front end area in the plate blank 3, a reflux area is formed in a range of 1/4 from the left of the middle area in the plate blank 3, a reflux area is formed in a range of 3/4 from the left of the front end area in the plate blank 3, and a reflux area is formed in a range of 1/4 from the right of the front end area in the plate blank 3, as shown in fig. 9, and the mode is suitable for steel types with lower solute components; the 1/4 range of the middle area and the two end areas inside the plate blank 3 is beneficial to balancing the molten steel acceleration of the 3/4 range of the reflux area, so that the stability of the molten steel components is protected.
The embodiments are not intended to limit the scope of the invention, but rather are intended to cover all equivalent implementations or modifications that can be made without departing from the scope of the invention.
Claims (10)
1. A continuous casting two-cold-zone sectional roller type multi-mode electromagnetic stirring flow control device is characterized in that: the device comprises two pairs of electromagnetic stirring rollers, wherein the two pairs of electromagnetic stirring rollers are arranged in parallel, each pair of electromagnetic stirring rollers comprises an electromagnetic stirring upper roller and an electromagnetic stirring lower roller, a plate blank is positioned between the two pairs of electromagnetic stirring rollers, and a gap is reserved between the plate blank and each electromagnetic stirring upper roller and each electromagnetic stirring lower roller; the electromagnetic stirring upper roller and the electromagnetic stirring lower roller are identical in structure, each roller adopts a sectional roller body structure, the number of roller body sections is four, each roller body section comprises an iron core and coils, the coils are coaxially wound on the iron core, insulating sheets are arranged between adjacent coils, and all the coils are provided with cooling devices.
2. The continuous casting two-cold-zone sectional roll type multi-mode electromagnetic stirring flow control device according to claim 1, wherein the flow control device is characterized in that: the coil is externally coated with a magnetic shielding sleeve, the cross section of the magnetic shielding sleeve is C-shaped, and a C-shaped opening of the magnetic shielding sleeve faces to the plate blank.
3. The continuous casting two-cold-zone sectional roll type multi-mode electromagnetic stirring flow control device according to claim 1, wherein the flow control device is characterized in that: the iron core adopts a cylindrical structure.
4. The continuous casting two-cold-zone sectional roll type multi-mode electromagnetic stirring flow control device according to claim 1, wherein the flow control device is characterized in that: the maximum magnetic induction intensity of the center of the slab is not lower than 0.08T.
5. The continuous casting two-cold-zone sectional roll type multi-mode electromagnetic stirring flow control device according to claim 1, wherein the flow control device is characterized in that: the number of turns of the coil is 0-88, and the coil is made of round or flat copper wires.
6. The continuous casting two-cold-zone sectional roll type multi-mode electromagnetic stirring flow control device according to claim 1, wherein the flow control device is characterized in that: different coil windings on the same iron core adopt different initial phases of current, the same current frequency is introduced, and the energizing mode adopts a pulse mode.
7. The continuous casting two-cold-zone sectional roll type multi-mode electromagnetic stirring flow control device according to claim 1, wherein the flow control device is characterized in that: the coil is required to be connected with U, V two-phase alternating current, the phase angle of the connected alternating current is 0-90 degrees, the current is 0-800A, and the frequency is 0-100 Hz; when the coil is connected with alternating current, an alternating electromagnetic field is excited, and the alternating electromagnetic field gradually permeates into the plate blank, so that the flow of molten steel in the plate blank is promoted by electromagnetic force; electromagnetic forces of different modes are generated by changing the current phase sequence.
8. The continuous casting two-cold-zone sectional roll type multi-mode electromagnetic stirring flow control device according to claim 1, wherein the flow control device is characterized in that: when the section size of the slab is smaller than 1000mm, only starting two middle roller bodies of the electromagnetic stirring upper roller and the electromagnetic stirring lower roller, wherein the electromagnetic force direction of the two middle roller bodies of the electromagnetic stirring upper roller is in a right-left mode, the electromagnetic force direction of the two middle roller bodies of the electromagnetic stirring lower roller is in a left-right mode, and six reflux areas are formed in the slab after the slab enters an action area of the roller bodies, wherein two reflux areas are respectively formed in the middle area and the two end areas in the slab; or the electromagnetic force direction of the middle two sections of roller bodies of the electromagnetic stirring upper roller is in a right-left mode, the electromagnetic force direction of the middle two sections of roller bodies of the electromagnetic stirring lower roller is in a right-left mode, after a plate blank enters the action zone of the roller bodies, eight reflux areas are formed in the plate blank, wherein four reflux areas are formed in the middle area in the plate blank, and two reflux areas are formed in the two end areas respectively.
9. The continuous casting two-cold-zone sectional roll type multi-mode electromagnetic stirring flow control device according to claim 1, wherein the flow control device is characterized in that: when the section size of the slab is 1000 mm-1800 mm, starting all four sections of roller bodies of an electromagnetic stirring upper roller and an electromagnetic stirring lower roller, wherein the electromagnetic force direction of all four sections of roller bodies of the electromagnetic stirring upper roller adopts a right-left mode, the electromagnetic force direction of all four sections of roller bodies of the electromagnetic stirring lower roller adopts a right-left mode, and eight reflux areas are formed in the slab after the slab enters an action area of the roller bodies, wherein two reflux areas are respectively formed in a middle area and a rear end area in the slab, and four reflux areas are formed in a front end area of the slab; or the electromagnetic force directions of all four roller bodies of the electromagnetic stirring upper roller are in a right-left-right mode, the electromagnetic force directions of all four roller bodies of the electromagnetic stirring lower roller are in a left-right-left mode, and after a plate blank enters the action zone of the roller bodies, twelve backflow zones are formed in the plate blank, wherein four backflow zones are formed in the middle zone and the two end zones in the plate blank respectively.
10. The continuous casting two-cold-zone sectional roll type multi-mode electromagnetic stirring flow control device according to claim 1, wherein the flow control device is characterized in that: when the section size of the slab is larger than 1800mm, starting all four sections of roller bodies of an electromagnetic stirring upper roller and an electromagnetic stirring lower roller, wherein the electromagnetic force direction of all four sections of roller bodies of the electromagnetic stirring upper roller adopts a right-left mode, the electromagnetic force direction of all four sections of roller bodies of the electromagnetic stirring lower roller adopts a right-left mode, seven reflux areas are formed in the slab after the slab enters an action area of the roller bodies, a reflux area is formed in a range of 3/4 from the left of the rear end area in the slab, a reflux area is formed in a range of 1/4 from the right of the rear end area in the slab, a reflux area is formed in a range of 1/4 from the left of the middle area in the slab, two reflux areas are formed in a range of 1/4 from the left of the front end area in the slab, and a reflux area is formed in a range of 3/4 from the right of the front end area in the slab; or the electromagnetic force directions of all four roller bodies of the electromagnetic stirring upper roller are in a right-left mode, the electromagnetic force directions of all four roller bodies of the electromagnetic stirring lower roller are in a left-right mode, six backflow areas are formed in the plate blank after the plate blank enters the action area of the roller bodies, one backflow area is formed in the range of 3/4 of the left end area of the inner rear end area of the plate blank, one backflow area is formed in the range of 1/4 of the right end area of the inner front end area of the plate blank, one backflow area is formed in the range of 1/4 of the right end area of the inner middle area of the plate blank, one backflow area is formed in the range of 3/4 of the left end area of the inner front end area of the plate blank, and one backflow area is formed in the range of 1/4 of the right end area of the inner front end area of the plate blank.
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| CN112548053A (en) * | 2020-11-23 | 2021-03-26 | 湖南中科电气股份有限公司 | Asymmetric sectional roller type electromagnetic stirring device for continuous casting slab secondary cooling area |
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