CN112548053A - Asymmetric sectional roller type electromagnetic stirring device for continuous casting slab secondary cooling area - Google Patents
Asymmetric sectional roller type electromagnetic stirring device for continuous casting slab secondary cooling area Download PDFInfo
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- CN112548053A CN112548053A CN202011321523.8A CN202011321523A CN112548053A CN 112548053 A CN112548053 A CN 112548053A CN 202011321523 A CN202011321523 A CN 202011321523A CN 112548053 A CN112548053 A CN 112548053A
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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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- 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
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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
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
Abstract
The invention provides an asymmetric sectional roller type electromagnetic stirring device for a secondary cooling area of a continuous casting slab. The continuous casting slab secondary cooling area asymmetric sectional roller type electromagnetic stirring device comprises a first sectional roller and a second sectional roller, wherein the first sectional roller and the second sectional roller are connected through a connecting cylinder, and the axial length of the first sectional roller is not equal to that of the second sectional roller; the first sectional roller and the second sectional roller are respectively connected with an external power supply and can form two independent traveling wave magnetic fields. Compared with the prior art, the invention is suitable for producing various casting blank widths, is particularly suitable for a continuous casting slab machine of a narrow-section casting blank, enables the part with relatively weak magnetic field intensity to deviate towards the end part of the casting blank, even can avoid the part with relatively weak magnetic field intensity from acting on the casting blank, greatly increases the average magnetic field intensity and the maximum magnetic field force of the casting blank, and improves the utilization rate of equipment and the metallurgical effect of products.
Description
Technical Field
The invention relates to the technical field of continuous casting secondary cooling area electromagnetic stirring, in particular to an asymmetric sectional roller type electromagnetic stirring device for a continuous casting slab secondary cooling area.
Background
In recent years, continuous casting steel is rapidly developed, the yield of continuous casting billets is continuously increased, the continuous casting process is continuously improved, and the technology is continuously mature. In addition, with the progress of steel making and rolling technologies, the structural changes of the steel industry and new requirements for product specifications and quality have also promoted the development of continuous casting technologies.
With the progress of the continuous casting slab technology, the electromagnetic stirring device for the continuous casting slab secondary cooling area is also continuously improved, and at present, three continuous casting slab secondary cooling area electromagnetic stirring devices are mainly used in the steel industry: 1) and passing through a roller type electromagnetic stirring roller. The electromagnetic stirring device is mainly suitable for a continuous casting slab machine with the width size of a casting blank being less than or equal to 1.8 m. The defects that if the electromagnetic stirring roller is used for casting blank with larger width, the diameter of the electromagnetic stirring roller needs to be increased or the length of the electromagnetic stirring roller needs to be increased, the structure of a continuous casting machine is inevitably changed by increasing the diameter, the mechanical strength is reduced by increasing the length of the electromagnetic stirring roller, the requirement on the mechanical strength cannot be met, and the phenomena of roller sleeve breakage and the like occur. The electromagnetic stirring device is only suitable for a continuous casting slab machine for producing casting blanks with smaller width; 2) and a long electromagnetic stirring roller with an auxiliary supporting device. The electromagnetic stirring device is characterized in that an auxiliary supporting device is additionally arranged below an electromagnetic roller, and the purpose of supporting is achieved by tangency between an auxiliary supporting roller and a roller sleeve surface, slag inclusion is easily caused by the structure, the service life of the auxiliary supporting roller is shortened, the service cycle of the auxiliary supporting roller is generally 2-3 months, the stability of equipment is affected, the auxiliary supporting roller is used for greatly modifying a fan-shaped section, and the difficulty in modifying the fan-shaped section is increased; 3) a conventional symmetric sectional roller type electromagnetic stirring roller (such as a continuous casting secondary cooling sectional roller type pulse current electromagnetic stirring device and method disclosed in the current patent publication No. CN 111299532A). The electromagnetic stirring device is characterized in that the electromagnetic stirring roller is made into a symmetrical sectional roller, the size of an iron core is consistent with that of an iron core of the through roller, the center of the sectional roller is disconnected for a certain distance, and no iron core coil part is arranged in the middle of the sectional roller, so that the central magnetic field intensity is obviously reduced, the magnetic field force at the center is small, the average magnetic field intensity is reduced by about 30 percent, and the average magnetic field intensity acting on a casting blank is enough for a wide-section casting blank. However, for a narrow section, the weaker part of the central magnetic field acts right on the middle of the casting blank, and because the casting blank has a small section, the effective magnetic field area acting on the casting blank is correspondingly reduced, so that the average magnetic field intensity is insufficient.
In the actual production process, the same continuous casting slab machine not only can produce casting blanks with one width, but also can produce casting blanks with different widths, and the traditional sectional roller can not meet the metallurgical requirement. In view of the defects of the conventional continuous casting slab secondary cooling area electromagnetic stirring device, the invention provides an asymmetric sectional roller type electromagnetic stirring device for the continuous casting slab secondary cooling area, so as to overcome the defects of the prior art.
Disclosure of Invention
The invention aims to provide an asymmetric sectional roller type electromagnetic stirring device for a second cold area of a continuous casting slab, which solves the problems of insufficient mechanical strength, equipment instability, insufficient average magnetic field strength, small central magnetic field force and the like of the traditional electromagnetic stirring device for the second cold area of the continuous casting slab, and improves the metallurgical effect of producing casting blanks with various widths by using the same continuous casting slab machine.
The technical scheme of the invention is as follows: the asymmetric sectional roller type electromagnetic stirring device for the second cold area of the continuous casting slab comprises a first sectional roller and a second sectional roller, wherein the first sectional roller and the second sectional roller are connected through a connecting cylinder, and the axial length of the first sectional roller is not equal to that of the second sectional roller; the first sectional roller and the second sectional roller are respectively connected with an external power supply, so that the first sectional roller and the second sectional roller can form two independent traveling wave magnetic fields.
Among the above-mentioned scheme, through having designed unequal first segmentation roller and second segmentation roller of length for electromagnetic stirring device is asymmetric structure, makes the weak part of magnetic field intensity remove to the direction that needs were adjusted, with the direction that is applicable to the production multiple casting blank width, on the continuous casting slab machine of specially adapted narrow section casting blank, the average magnetic field intensity and the biggest magnetic field force of greatly increased casting blank have promoted the utilization ratio and the product metallurgical effect of equipment. In addition, the first sectional roller and the second sectional roller can respectively adjust electrical parameters, so that the direction of electromagnetic force can be adjusted, and the magnetic field intensity generated by the two sectional rollers is optimal.
Preferably, the first segmentation roller comprises a first nonmagnetic roller sleeve and a first electromagnetic inductor arranged in the first nonmagnetic roller sleeve; the second sectional roller comprises a second nonmagnetic roller sleeve and a second electromagnetic inductor arranged in the second nonmagnetic roller sleeve; the first non-magnetic roller sleeve and the second non-magnetic roller sleeve are connected with the connecting cylinder; the first electromagnetic inductor and the second electromagnetic inductor are respectively connected with the external power supply.
Preferably, the first electromagnetic inductor comprises a first iron core and a first coil winding, and the first coil winding is wound on the first iron core; the second electromagnetic inductor comprises a second iron core and a second coil winding, and the second coil winding is wound on the second iron core; the first coil winding and the second coil winding are respectively connected with an external power supply.
Preferably, the first coil winding and the second coil winding are different in winding structure, and the winding structure includes a rotation direction and/or a number of turns of the coil.
Preferably, the length of the first non-magnetic roller sleeve and the second non-magnetic roller sleeve is 300 mm-2000 mm, and the outer diameter of the roller sleeve is phi 100 mm-phi 400 mm.
Preferably, a distance L is formed between the end of the first segment roller remote from the connecting cylinder and the end of the second segment roller remote from the connecting cylinder, the distance L having a center line H, and the connecting cylinder being offset with respect to the center line H.
Preferably, the connecting cylinder is offset in the direction of the second split roller with respect to the center line H.
Preferably, the axial length of the first segment roller is longer than the axial length of the second segment roller.
The first sectional roller 1 is longer than the second sectional roller 7, so that the winding space area of the first sectional roller is larger than that of a single roller of the traditional symmetrical sectional roller, and compared with the traditional symmetrical sectional roller, the central magnetic field intensity of the first sectional roller is about 200% of that of the traditional sectional roller type electromagnetic stirring roller, the average magnetic field intensity acting on a casting blank is about 300% of that of the traditional sectional roller type electromagnetic stirring roller, and the magnetic field intensity generated by the two sectional rollers is optimal.
Preferably, the tail ends, far away from the connecting cylinder, of the first sectional roller and the second sectional roller are sequentially connected with a water outlet cylinder and an outlet box.
Compared with the related technology, the invention has the beneficial effects that:
the position of the connecting cylinder is adjusted, so that the part with a weaker central magnetic field moves towards the direction of the second sectional roller, the magnetic field intensity and electromagnetic force distribution on the section of the casting blank gradually shift along with the increase of the shifting distance of the connecting cylinder from the center of the casting blank, and the part with the weaker magnetic field intensity gradually moves from left to right, so that the influence of the part with the weaker magnetic field intensity on the casting blank can be reduced to the greatest extent;
secondly, because the first sectional roller is longer than the second sectional roller, the winding space area of the first sectional roller is larger than that of a single roller of the traditional symmetrical sectional roller, so compared with the traditional symmetrical sectional roller, the central magnetic field intensity of the first sectional roller is about 200 percent of that of the traditional sectional roller type electromagnetic stirring roller, the average magnetic field intensity acting on the casting blank is about 300 percent of that of the traditional sectional roller type electromagnetic stirring roller, and the magnetic field intensity generated by the two sectional rollers is optimal;
compared with the traditional split-roller electromagnetic stirring device, the continuous casting slab secondary cooling area asymmetric split-roller electromagnetic stirring device enriches stirring modes, comprises a single butterfly-shaped flow field rotation mode and a double butterfly-shaped flow field secondary area rotation mode, and can meet more metallurgical requirements;
and fourthly, changing the action point of the part with weaker magnetic field intensity to ensure that the part with weaker magnetic field intensity reaches the asymmetric sectional roller type electromagnetic stirring device in the continuous casting slab secondary cooling area with the best metallurgical effect, wherein the electromagnetic stirring device is suitable for a continuous casting slab machine for producing various casting slabs with widths, particularly narrow-section casting slabs, so that the part with weaker magnetic field intensity deviates towards the end part of the casting slab, even the part with weaker magnetic field intensity can be prevented from acting on the casting slab, the average magnetic field intensity and the maximum magnetic field force of the casting slab are greatly increased, and the utilization rate of equipment and the product metallurgical effect are improved.
Drawings
FIG. 1 is a schematic view of a conventional sectional roller type electromagnetic stirring device applied to a narrow slab;
FIG. 2 is a schematic structural view of a continuous casting slab secondary cooling zone asymmetric sectional roller type electromagnetic stirring device provided by the invention;
FIG. 3 is a schematic view of the asymmetric sectional roller type electromagnetic stirring device for the secondary cooling zone of the continuous casting slab, which is provided by the invention, acting on a narrow slab;
FIG. 4 is a graph showing the comparison of the magnetic field intensity distribution between the asymmetric sectional roller type electromagnetic stirring device of the present invention and the conventional sectional roller type electromagnetic stirring device;
FIG. 5 is a schematic view of a first flow field according to the present invention;
FIG. 6 is a schematic representation of a first flow field of the present invention;
FIG. 7 is a schematic structural diagram of a second flow field according to the present invention;
fig. 8 is a schematic view of a second flow field of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.
As shown in fig. 2, the present embodiment provides a continuous casting slab secondary cooling zone asymmetric sectional roller type electromagnetic stirring apparatus, which includes a first sectional roller 1, a second sectional roller 7, and a connecting cylinder 6 connected between the first sectional roller 1 and the second sectional roller 7.
The first sectional roller 1 comprises a first nonmagnetic roller sleeve 2 and a first electromagnetic inductor 3 arranged in the first nonmagnetic roller sleeve 2. The second sectional roller 7 comprises a second nonmagnetic roller sleeve 8 and a second electromagnetic inductor 9 arranged in the second nonmagnetic roller sleeve 8. The first nonmagnetic roller sleeve 7 and the second nonmagnetic roller sleeve 8 are connected with the connecting cylinder 6.
After the first electromagnetic inductor 3 and the second electromagnetic inductor 9 are electrified with alternating current, a traveling wave magnetic field is excited to generate electromagnetic force. The first electromagnetic inductor 3 comprises a first iron core 4 and a first coil winding 5, and the first coil winding 5 is wound on the first iron core 4. The second electromagnetic inductor 9 includes a second iron core 10 and a second coil winding 11, and the second coil winding 11 is wound on the second iron core 10. The first coil winding 5 and the second coil winding 11 are respectively connected with an external power supply, so that the first sectional roller 1 and the second sectional roller 7 can form two independent traveling wave magnetic fields.
The first coil winding 5 and the second coil winding 11 are different in winding mode structure, the winding mode structure comprises the rotation direction and/or the number of turns of a coil, and meanwhile, the coil types of the two coil windings are different. The first electromagnetic inductor 3 and the second electromagnetic inductor 9 may have the same or different electrical parameters. The magnetic field strength of the first segment roller 1 and the second segment roller 7 is optimized by adjusting the electrical parameters.
The end of the first segment roller 1 remote from the connecting cylinder 6 and the end of the second segment roller 7 remote from the connecting cylinder 6 form a distance L, which has a center line H, relative to which the connecting cylinder 6 is offset. And the connecting cylinder 6 is offset in the direction of the second segment roller 7 with respect to the center line H such that the axial length of the first segment roller 1 is longer than the axial length of the second segment roller 7.
The connecting cylinder 6 is a coreless coil winding part and plays a role in connection and support. By adjusting the position of the connecting cylinder 6, the first segment roller 1 is lengthened, and at the same time, the length of the second segment roller 7 is correspondingly reduced, so that the part with weaker central magnetic field moves towards the second segment roller 7. With the increase of the offset of the connecting cylinder 6 from the central line H, the magnetic field intensity and the electromagnetic force distribution on the section of the casting blank are gradually offset, and the part with weaker magnetic field intensity gradually moves from left to right, so that the influence of the part with weaker magnetic field intensity on the casting blank can be reduced to the greatest extent.
The length of the first nonmagnetic roller sleeve 2 and the second nonmagnetic roller sleeve 8 is 300 mm-2000 mm, and the outer diameter of the roller sleeve is phi 100 mm-phi 400 mm. And the first nonmagnetic roller sleeve 2 and the second nonmagnetic roller sleeve 8 can be customized according to the actual production casting blank metallurgy requirement.
The tail ends of the first sectional rollers 1, which are far away from the connecting cylinder 6, are sequentially connected with a first water outlet cylinder 12a and a first outlet box 13 a. The tail ends of the second sectional rollers 7 far away from the connecting cylinder 6 are sequentially connected with a second water outlet cylinder 12b and a second outlet box 13 b. The water outlet barrel and the outlet box are the existing technologies, which are not the improvement points of the invention, and the structure and the functional principle are not described again.
Fig. 2 is a schematic diagram of a conventional segmented roller type electromagnetic stirring device acting on a continuous casting narrow slab, and fig. 3 is a schematic diagram of an asymmetric segmented roller type electromagnetic stirring device of the present invention acting on a continuous casting narrow slab, respectively, and electromagnetic forces generated by the electromagnetic stirring device act together on a narrow-sized continuous casting slab 14.
Referring to fig. 4, in the drawings: br1 is the magnetic field intensity spatial distribution curve of the traditional sectional roller type electromagnetic stirring roller, and Br2 is the magnetic field intensity spatial distribution curve of the asymmetric sectional roller type electromagnetic stirring roller. For narrow slabs, by using the asymmetric sectional roller type electromagnetic stirring roller device, the curve chart of the magnetic field intensity distribution shows that the concave part of the magnetic field intensity deviates to the right, which shows that the weaker part of the magnetic field deviates to the right. And as can be seen from the figure, the maximum value A2 of the magnetic field intensity of the electromagnetic stirring roller is about 2 times of the maximum value A1 of the magnetic field intensity of the traditional sectional roller type electromagnetic stirring roller, the minimum value B2 of the magnetic field intensity is much larger than the value B1 of the magnetic field intensity, and the effective average magnetic field intensity acting on the narrow plate blank is increased to 3 times from the overall distribution curve, so that the corresponding electromagnetic force is also increased, and the metallurgical effect of the casting blank is greatly improved.
Referring to fig. 5 and 6, in the drawings: a is the flowing direction of molten steel, B is the direction of drawing blank, and F is the direction of electromagnetic force. By respectively adjusting the electrical parameters of the first sectional roller 1 and the second sectional roller 7, the electromagnetic forces generated by the first sectional roller 1 and the second sectional roller 7 can be directed in the same direction, and the molten steel flowing on the continuous casting slab 14 generates upward circulation and downward circulation in the same direction, so that a single rotation mode is formed.
Referring to fig. 7 and 8, by adjusting the electrical parameters of the first segment roll 1 and the second segment roll 7, the electromagnetic forces of the first segment roll 1 and the second segment roll 7 can be opposite or opposite, and the molten steel flowing on the continuous casting slab 14 can generate two upward circulations and two downward circulations, thereby forming a two-zone rotating stirring mode.
According to the technical scheme, the length of the inductor in the two sectional rollers is adjusted, the iron core is optimized, the position of the weaker magnetic field part in the middle part can be flexibly adjusted, and the maximum value and the minimum value of the magnetic field intensity are greatly increased compared with the magnetic field intensity of the traditional sectional roller type electromagnetic stirring roller. The central magnetic field intensity of the device is about 200% of that of the traditional sectional roller type electromagnetic stirring roller, the average magnetic field intensity acting on the casting blank is about 300% of that of the traditional sectional roller type electromagnetic stirring roller, so that the magnetic field intensity generated by the two sectional rollers is optimal, the average magnetic field intensity and the maximum magnetic field force are better suitable for the condition of producing narrow slabs by a medium-width continuous casting slab machine, the electromagnetic stirring device is also in a working area where a linear magnetic field is generated by an inductor, the electromagnetic stirring device is in a better position, the stirring mode is enriched, the device comprises a single rotation mode and a two-area rotation mode, the device can be suitable for more metallurgical requirements, and the device is a necessary device for improving the casting blank quality and the metallurgical.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. The asymmetric sectional roller type electromagnetic stirring device for the second cold zone of the continuous casting slab comprises a first sectional roller (1) and a second sectional roller (7), and is characterized in that the first sectional roller (1) and the second sectional roller (7) are connected through a connecting cylinder (6), and the axial length of the first sectional roller (1) is not equal to that of the second sectional roller (7); the first sectional roller (1) and the second sectional roller (7) are respectively connected with an external power supply, so that the first sectional roller (1) and the second sectional roller (7) can form two independent traveling wave magnetic fields.
2. The asymmetric segmented roller type electromagnetic stirring device for the second cold zone of the continuous casting slab as claimed in claim 1, characterized in that the first segmented roller (1) comprises a first nonmagnetic roller shell (2) and a first electromagnetic inductor (3) arranged in the first nonmagnetic roller shell (2); the second sectional roller (7) comprises a second nonmagnetic roller sleeve (8) and a second electromagnetic inductor (9) arranged in the second nonmagnetic roller sleeve (8); the first non-magnetic roller sleeve (7) and the second non-magnetic roller sleeve (8) are connected with the connecting cylinder (6); the first electromagnetic inductor (3) and the second electromagnetic inductor (9) are respectively connected with the external power supply.
3. The continuous cast slab secondary cooling zone asymmetric segmented roller type electromagnetic stirring device according to claim 2, characterized in that the first electromagnetic inductor (3) comprises a first iron core (4) and a first coil winding (5), and the first coil winding (5) is wound on the first iron core (4); the second electromagnetic inductor (9) comprises a second iron core (10) and a second coil winding (11), and the second coil winding (11) is wound on the second iron core (10); the first coil winding (5) and the second coil winding (11) are respectively connected with an external power supply.
4. The secondary cold-zone asymmetric segmented roller type electromagnetic stirring device for continuously cast slabs according to claim 3, wherein the first coil winding (5) and the second coil winding (11) are different in winding manner structure, the winding manner structure comprises a rotation direction and/or a number of turns of the coil.
5. The continuous casting slab secondary cold zone asymmetric segmented roller type electromagnetic stirring device according to claim 2, characterized in that the length of the first non-magnetic roller shell (2) and the second non-magnetic roller shell (8) is 300mm to 2000mm, and the outer diameter of the roller shell is phi 100mm to phi 400 mm.
6. The asymmetric segmented roller type electromagnetic stirring device for the secondary cooling zone of the continuous casting slab as claimed in any one of claims 1 to 5, wherein a distance L is formed between the end of the first segmented roller (1) far away from the connecting cylinder (6) and the end of the second segmented roller (7) far away from the connecting cylinder (6), the distance L has a center line H, and the connecting cylinder (6) is offset relative to the center line H.
7. The asymmetric segmented roller type electromagnetic stirring device for secondary cooling of continuous casting slabs according to claim 6, characterized in that the connecting cylinder (6) is offset in the direction of the second segmented roller (7) with respect to the center line H.
8. The asymmetric segmented roller type electromagnetic stirring device for the secondary cooling zone of the continuous casting slab as claimed in any one of claims 1 to 5, characterized in that the axial length of the first segmented roller (1) is longer than the axial length of the second segmented roller (7).
9. The asymmetric sectional roller type electromagnetic stirring device for the secondary cooling area of the continuous casting slab as claimed in any one of claims 1 to 5, wherein the ends of the first sectional roller (1) and the second sectional roller (7) far away from the connecting cylinder (6) are sequentially connected with a water outlet cylinder and an outlet box.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116213664A (en) * | 2023-03-27 | 2023-06-06 | 东北大学 | Continuous casting two-cold-zone sectional roller type multi-mode electromagnetic stirring flow control device |
| CN116352039A (en) * | 2023-06-01 | 2023-06-30 | 江苏省沙钢钢铁研究院有限公司 | Center quality control method of continuous casting billet for bridge steel |
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| CN116352039A (en) * | 2023-06-01 | 2023-06-30 | 江苏省沙钢钢铁研究院有限公司 | Center quality control method of continuous casting billet for bridge steel |
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