CN108500227B - Crystallizer flow field electromagnetic control method for slab continuous casting production - Google Patents
Crystallizer flow field electromagnetic control method for slab continuous casting production Download PDFInfo
- Publication number
- CN108500227B CN108500227B CN201710107016.6A CN201710107016A CN108500227B CN 108500227 B CN108500227 B CN 108500227B CN 201710107016 A CN201710107016 A CN 201710107016A CN 108500227 B CN108500227 B CN 108500227B
- Authority
- CN
- China
- Prior art keywords
- crystallizer
- electromagnetic
- water gap
- electromagnetic stirrer
- upper edge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a crystallizer flow field electromagnetic control method for slab continuous casting production, which adopts a plurality of sets of electromagnetic stirrers to control a crystallizer flow field, wherein the electromagnetic stirrers are traveling wave magnetic field generators, the electromagnetic stirrers are respectively arranged in the upper area of a wide surface (9) of a crystallizer and the lower area of a narrow surface (3) of the crystallizer, the upper electromagnetic stirrer (4) is arranged between the upper edge of the outlet of a water gap (2) and a meniscus (1), and the lower electromagnetic stirrer (7) is arranged below an impact point of a water gap side hole spit-out flow and the narrow surface; the upper and lower electromagnetic stirrers are respectively powered by a power supply and independently control the current intensity. The upper edge of the lower electromagnetic stirrer iron core and the intersection point of a straight line (6) which takes the upper edge of a water gap outlet as a starting point and the angle of the water gap outlet as an angle and the narrow surface of the crystallizer are positioned at the same height, and the stirring direction of the stirring coil is opposite to the flow (5) of the lower circular flow along the narrow edge from bottom to top, so that the impact depth of the lower circular flow is weakened.
Description
Technical Field
The invention relates to a crystallizer control technology for slab continuous casting production, in particular to a crystallizer flow field electromagnetic control method for slab continuous casting production.
Background
In the slab continuous casting process, molten steel enters a continuous casting crystallizer through a submerged nozzle, and molten steel streams respectively flow in the upper direction and the lower direction after impacting the narrow surface of the crystallizer, so that an upper circulation flow and a lower circulation flow are formed in the crystallizer. The upper ring flow governs the molten steel flow near the meniscus of the crystallizer, and influences the melting and spreading of the casting powder and the entrainment of the casting powder; the impact depth of the lower circulation dominates the floating separation on inclusions and bubbles. Therefore, the flow of molten steel in the crystallizer must be controlled from two points: (1) the meniscus must be stabilized to reduce the reverse flow rising along the solidification front to maintain the proper horizontal flow rate under the meniscus. The meniscus is easy to fluctuate due to too high flow speed, so that the casting powder is sucked and captured in the casting blank to become internal and subcutaneous defects; when the flow rate is too low, initial solidification develops near the meniscus, and inclusions and bubbles are captured by the solidification hook at the tip of the solidification surface, resulting in surface defects. (2) It is necessary to prevent the downward flow discharged from the side holes of the submerged nozzle from intruding into the depth of the liquid pool to facilitate the floating separation of the inclusions and bubbles. The electromagnetic force has the advantages of non-contact and no pollution, and is widely used in the aspect of controlling the flow of molten steel in the crystallizer. At present, the electromagnetic stirring technology and the electromagnetic braking technology of the crystallizer are commonly adopted.
The electromagnetic stirring technology is characterized in that the motion of liquid-cavity molten steel is strengthened by means of electromagnetic force induced in a casting blank liquid cavity, so that the convection, heat transfer and mass transfer processes of the molten steel are strengthened, the solidification process of a casting blank is controlled, and the effect of improving the quality of the casting blank is achieved. The electromagnetic stirrer mainly comprises a stirring coil and an iron core. JP57017355A discloses a travelling electromagnetic stirrer for slabs, in which a linear stirrer is arranged along each side of the broad side of a slab mold, and the stirring directions of the two stirrers are opposite, so that a complete circulation can be formed in the mold. Chinese patent CN96121903.3 proposes that two stirrers are respectively arranged along both sides of the broad side of the slab crystallizer, and the two stirrers on each side cover 1/2 broad sides of the crystallizer respectively. Compared with the traditional annular stirring, the annular stirring device has certain adjustability and can adapt to more working conditions. Chinese patent CN200910302486.3 proposes an inductor which divides the inside of the crystallizer into at least 4 magnetic field regions, and by combination, can realize five stirring modes of single rotation, electromagnetic deceleration, electromagnetic acceleration, two-region rotation and four-region rotation. The latter two stirrers are essentially only structurally different from the first stirrer, and the principle is the same. The above-mentioned technique using electromagnetic stirring alone can form a horizontal circulation in the mold and stabilize the molten steel flow velocity near the meniscus, but cannot reduce the depth of penetration of the downward stream discharged from the side hole of the submerged nozzle into the liquid pool, and cannot improve the floating conditions of nonmetallic inclusions and bubbles therein.
Aiming at the problem of relatively deep impact of stream discharged from a water gap at high drawing speed, an electromagnetic braking technology is developed, a static magnetic field is applied to molten steel moving at high speed, and the absolute speed of the molten steel is reduced through Lorenz force generated by induction, so that the impact depth of the molten steel is reduced, and the floating condition of non-metallic inclusions and bubbles at the molten steel is improved. The technology is used together with electromagnetic stirring, and a using method which fully utilizes the characteristics of the two technologies and exerts the advantages of the two technologies is also continuously developed. Chinese patents CN201080019323 and CN201080019325 adopt a method of lower braking and upper stirring, and the two technologies are used in combination in the slab continuous casting production process. However, the electromagnetic braking technology is a 'passive' technology, braking is carried out by means of electromagnetic force generated by molten steel cutting magnetic induction lines, the magnitude of braking force depends on the magnitude of molten steel flow velocity to a great extent, and only under the conditions of very high drawing speed and very high molten steel flow velocity, the electromagnetic braking technology can play a certain role in improving the impact depth of molten steel; for the slab production process at medium and high draw speeds, the effect is limited. When the flow rate of molten steel is constant, if the electromagnetic force of braking needs to be further improved, the problem can be solved only by improving the strength of a static magnetic field, and the difficulty is greatly increased for manufacturing an electromagnetic braking power supply, a coil and the like. Chinese patents CN1266759A and CN1302703A adopt a method of lower stirring and upper braking, and aim to be beneficial to an electromagnetic stirring technology to improve the solidification quality and utilize the electromagnetic braking technology to stabilize the liquid level fluctuation. The electromagnetic stirrer is arranged below a water port of the crystallizer, and the electromagnetic force along the horizontal direction of the crystallizer interacts with the obliquely downward flowing stream spitted out from the side hole of the water port, so whether the improvement of the casting blank quality is facilitated or not is still to be verified, but the action on reducing the impact depth of the spitting stream out from the side hole of the water port is quite limited, and the floating condition of non-metallic inclusions and bubbles in the crystallizer cannot be effectively improved.
Disclosure of Invention
The invention aims to provide a crystallizer flow field electromagnetic control method for slab continuous casting production, which controls the flow of molten steel in a crystallizer by reasonably arranging an electromagnetic stirrer at a local position of the crystallizer, effectively reduces the impact depth of lower circulation, improves the floating condition of non-metallic inclusions and bubbles and achieves the purpose of improving the quality of a casting blank.
In order to realize the technical scheme, the invention adopts the following technical scheme:
a magnetic control method for a crystallizer flow field for slab continuous casting production adopts a plurality of sets of electromagnetic stirrers to control the crystallizer flow field, wherein the electromagnetic stirrers are traveling wave magnetic field generators, the electromagnetic stirrers are respectively arranged in the upper area of the wide surface of a crystallizer and the lower area of the narrow surface of the crystallizer, the upper electromagnetic stirrer is arranged between the upper edge of the water gap outlet and a meniscus, and the lower electromagnetic stirrer is arranged below an impact point of a water gap side hole spitting stream and the narrow surface; the upper and lower electromagnetic stirrers are respectively powered by two sets of power supplies and can respectively and independently control the current intensity.
The magnetic fields of the upper electromagnetic stirrer on the two sides of the wide surface of the crystallizer respectively drive the molten steel to do relative horizontal motion, the upper electromagnetic stirrer covers the area from the upper edge of the water gap outlet to the meniscus, the coverage ratio is larger than 0.75, namely the ratio of the height of the iron core of the upper electromagnetic stirrer to the distance from the upper edge of the water gap outlet to the meniscus is larger than 0.75.
The lower electromagnetic stirrer is provided with two groups of stirring coils which are respectively positioned on one side of the narrow surface of the crystallizer, the upper edge of the iron core of the lower electromagnetic stirrer and the intersection point of a straight line which takes the upper edge of a water gap outlet as a starting point and the angle of the water gap outlet as an angle and the narrow surface of the crystallizer are positioned at the same height, and the stirring direction of each group of stirring coils is opposite to the stream direction of lower circular flow along the narrow edge from bottom to top and is used for weakening the impact depth of the lower circular flow stream.
When the width of the plate blank is changed, the lower electromagnetic stirrer and the width-adjusting copper plate of the crystallizer move together in the horizontal direction; in the vertical direction, the upper edge of the lower electromagnetic stirrer is always at the same height with the intersection point of a straight line which takes the upper edge of the water gap outlet as a starting point and the angle of the water gap outlet as an angle and the narrow surface of the crystallizer by utilizing the lifting mechanism to adjust the upper and lower positions of the lower electromagnetic stirrer.
The lower electromagnetic stirrer is provided with four groups of stirring coils, each crystallizer wide surface is provided with two groups of stirring coils, and the two groups of stirring coils on the same crystallizer wide surface are respectively close to the two narrow surfaces of the crystallizer and are symmetrically arranged by taking the vertical center line of the crystallizer as an axis; two groups of stirring coils which are close to the narrow surface of the same crystallizer and are respectively positioned on the two wide surfaces of the crystallizer are arranged in a face-to-face manner; the upper edge of the lower electromagnetic stirrer iron core and the intersection point of a straight line which takes the upper edge of a water gap outlet as a starting point and takes the angle of the water gap outlet as an angle and the narrow surface of the crystallizer are positioned at the same height, the stirring directions of all groups of stirring coils are from bottom to top and are opposite to the stream direction of the lower circular stream along the narrow edge, and the lower circular stream impact depth is weakened.
When the width of the plate blank is changed, the relative positions of the stirring coil and the width-adjusting copper plate of the crystallizer are kept constant by the lower electromagnetic stirrer in the horizontal direction; in the vertical direction, the lower electromagnetic stirrer keeps the upper edge of the iron core of the stirring coil at the same height with the intersection point of a straight line which takes the upper edge of a water gap outlet as a starting point and takes the angle of the water gap outlet as an angle and a narrow surface of the crystallizer.
The electromagnetic control method of the crystallizer flow field for the slab continuous casting production aims at the phenomenon that when the continuous casting production drawing speed is high, the stream impact of the water outlet is too deep and is not beneficial to the floating of nonmetallic inclusions and bubbles, and an electromagnetic field is applied in a targeted mode at the local position of the narrow side of the crystallizer according to a double-loop structure in the crystallizer during the continuous casting production, so that the impact depth of the stream of the water outlet is reduced to the maximum extent, the floating condition of the nonmetallic inclusions and the bubbles in the crystallizer is improved, the probability of capturing the nonmetallic inclusions and the bubbles by a solidified initial billet shell is reduced, and the quality.
The flow state of the molten steel in the crystallizer is controlled by adopting the electromagnetic control method of the crystallizer flow field, and the impact depth of low circulation flow is actively reduced by utilizing an electromagnetic stirrer at the lower part, so that the floating of nonmetallic inclusions and bubbles is facilitated; compared with the lower part which adopts the electromagnetic braking technology to passively reduce the lower circulation flow velocity and the impact depth, the electromagnetic stirring technology is adopted to actively apply the electromagnetic force, and the device has the advantages of wide parameter adjusting range, flexible operation, mastery of the production initiative and the like. The exciting currents of the upper and lower electromagnetic stirrers can be adjusted according to different drawing speed processes, so that the molten steel flow field in the crystallizer can be actively adjusted in a larger flow velocity interval, a better electromagnetic flow control effect is achieved, and finally, a high-quality continuous casting billet can be obtained.
The invention relates to a crystallizer flow field electromagnetic control method for slab continuous casting production, which aims at improving the flow field in a crystallizer, achieves the effect of optimizing the flow field in the crystallizer by reasonably arranging a plurality of electromagnetic stirrers at different local positions of the crystallizer, and further improves the quality of continuous casting billets. The method can actively adjust the flowing state of the molten steel in the crystallizer according to the actual continuous casting process, such as different steel types and drawing speeds, can adjust the flow field in a wider speed range, has strong activity and has wider application prospect.
Drawings
FIG. 1 is a schematic diagram of the electromagnetic control method of the crystallizer flow field for slab continuous casting production according to the present invention;
FIG. 2 is a three-dimensional schematic diagram of an arrangement form of electromagnetic stirrers of the electromagnetic control method for the crystallizer flow field of the invention;
fig. 3 is a three-dimensional schematic diagram of another arrangement form of the electromagnetic stirrers of the crystallizer flow field electromagnetic control method.
In the figure: the method comprises the following steps of 1 meniscus, 2 water gaps, 3 narrow-face copper plates (width-adjustable copper plates) of the crystallizer, 4 upper electromagnetic stirrers, 5 molten steel impact streams, 6 straight lines with the upper edge of a water gap outlet as a starting point and the angle of the water gap outlet as an angle, 7 lower electromagnetic stirrers (stirring coils), 8 hydraulic lifting mechanisms and 9 wide faces of the crystallizer.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, 2 and 3, a method for electromagnetically controlling a crystallizer flow field for slab continuous casting production, which uses a plurality of sets of electromagnetic stirrers to control the crystallizer flow field, wherein the electromagnetic stirrers are traveling wave magnetic field generators and mainly comprise stirring coils and iron cores, and the electromagnetic stirrers comprise an upper electromagnetic stirrer 4 and a lower electromagnetic stirrer 7; an upper electromagnetic stirrer 4 is arranged in the upper region of the wide face 9 of the mold, a lower electromagnetic stirrer 7 is arranged in the lower region of the narrow face 3 of the mold, the upper electromagnetic stirrer 4 is mounted between the upper edge of the outlet of the nozzle 2 and the meniscus 1, and the lower electromagnetic stirrer 7 is mounted below the impact point between the discharge stream at the side hole of the nozzle 2 and the narrow face 3. The upper and lower electromagnetic stirrers 4, 7 are respectively powered by two sets of power supplies and can respectively and independently control the current intensity. The electromagnetic stirrer is reasonably arranged at the local position of the crystallizer, so that the flow of molten steel in the crystallizer is controlled, the impact depth of lower circulation is effectively reduced, the floating condition of nonmetallic inclusions and bubbles is improved, the probability of capturing the nonmetallic inclusions and the bubbles by a solidified initial billet shell is reduced, and the purpose of improving the quality of a casting billet is achieved.
The magnetic fields of the upper electromagnetic stirrer 4 on two sides of the wide face 9 of the crystallizer respectively drive the molten steel to make relative horizontal motion, the crystallizer is a slab crystallizer, the upper electromagnetic stirrer covers the area between the upper edge of the water gap outlet and the meniscus, the coverage ratio is greater than 0.75, namely the ratio of the height of the iron core of the upper electromagnetic stirrer 4 to the distance between the upper edge of the water gap 2 outlet and the meniscus 1 is greater than 0.75.
There are two arrangements for the structure of the lower electromagnetic stirrer 7. In one arrangement, referring to fig. 2, the lower electromagnetic stirrer 7 is two groups of stirring coils which are respectively located on one side of the narrow face 3 of the crystallizer, the intersection point of the upper edge of the iron core of the lower electromagnetic stirrer 7 and a straight line 6 which takes the upper edge of a water gap outlet as a starting point and takes the angle of the water gap outlet as an angle with the narrow face 3 of the crystallizer is located at the same height, and the stirring direction of each stirring coil is opposite to the flow 5 of the lower circular flow along the narrow edge from bottom to top, so as to weaken the impact depth of the lower circular flow 5.
In the production process, when the slab specification, namely the slab width, changes, the lower electromagnetic stirrer 7 moves together with the width-adjusting copper plate 3 in the horizontal direction; in the vertical direction, the upper edge of the lower electromagnetic stirrer 7 is always at the same height with the intersection point of a straight line 6 which takes the upper edge of the water gap outlet as a starting point and the angle of the water gap outlet as an angle and the narrow face 3 of the crystallizer by adjusting the upper and lower positions of the lower electromagnetic stirrer 7 by using a hydraulic lifting mechanism 8.
Another arrangement form of the lower electromagnetic stirrers is that, referring to fig. 3, the lower electromagnetic stirrers 7 are four groups of stirring coils, each crystallizer broad surface 9 has two groups of stirring coils, and the two groups of stirring coils on the same broad surface are respectively close to the two narrow surfaces 3 of the crystallizer and are symmetrically arranged by taking the vertical center line of the crystallizer as an axis; two groups of stirring coils which are close to the same narrow surface of the crystallizer and are respectively positioned on two wide surfaces of the crystallizer are arranged in a face-to-face manner; the iron core upper edge of the lower electromagnetic stirrer 7 and the intersection point of a straight line 6 which takes the water gap outlet upper edge as a starting point and the water gap outlet angle as an angle and the narrow face 3 of the crystallizer are positioned at the same height, the stirring direction of each stirring coil is from bottom to top and is opposite to the stream 5 direction of the lower circular stream along the narrow edge, and the stirring direction is used for weakening the impact depth of the lower circular stream 5.
In the production process, when the specification of the slab, namely the width of the slab, changes, the position of the stirring coil is adjusted by the hydraulic lifting mechanism 8. The lower electromagnetic stirrer 7 keeps the relative position of the stirring coil and the width adjusting copper plate 3 constant in the horizontal direction; in the vertical direction, the lower electromagnetic stirrer 7 keeps the upper edge of the iron core of the stirring coil at the same height as the intersection point of a straight line 6 which takes the upper edge of a water gap outlet as a starting point and takes a water gap outlet angle as an angle and the narrow face 3 of the crystallizer.
The average magnetic induction intensity of the upper electromagnetic stirrer 4 at the position 15mm away from the front edge of the wide-surface copper plate 9 of the crystallizer is more than 0.065T, and the size of the upper electromagnetic stirrer can be adjusted according to working conditions; the electromagnetic stirring frequency is between 1 Hz and 6Hz, the average magnetic induction intensity of the lower electromagnetic stirrer 7, which is positioned at the 15mm position of the front edge of the narrow-face width-adjusting copper plate 3 of the crystallizer, is more than 0.1T, and the size of the electromagnetic stirrer can be adjusted according to working conditions.
Examples
The production conditions are as follows: the IF steel plate with the pulling speed of 1.6m/s, the width of 1450mm and the thickness of 230mm is produced, the insertion depth of the nozzle (namely the distance from a meniscus to the upper edge of the nozzle) is 190mm, the outer diameter of the nozzle is 80mm, and the inclination angle of the nozzle and the axis of the nozzle is 75 degrees. Aiming at the working condition, the method of the invention simultaneously uses the electromagnetic stirrers at a plurality of local parts of the crystallizer to reasonably adjust the flow field in the crystallizer.
The height of an iron core of the electromagnetic stirrer of the crystallizer is 150mm when the iron core of the electromagnetic stirrer of the crystallizer is arranged along the upper part of the wide surface of the crystallizer, the installation position is positioned between the upper edge of a water gap outlet and a meniscus, and the coverage ratio of the effective stirring area is more than 0.75. Two electromagnetic stirring devices are arranged along the lower part of the narrow side of the crystallizer, and the upper edge of the electromagnetic braking iron core is 180mm away from the upper edge of the water outlet discharge hole.
In the production process, an upper electromagnetic stirrer is started, the frequency of the electromagnetic stirrer is 5Hz, and the average magnetic induction intensity of a travelling wave magnetic field generated by the electromagnetic stirrer at the position 15mm from the front edge of the wide-surface copper plate of the crystallizer reaches about 700 Gauss. The electromagnetic stirrer induces electromagnetic force in the molten steel in the crystallizer and drives the molten steel to move along the wide surface of the copper plate of the crystallizer to form a molten steel circulation in the horizontal direction. The molten steel movement can wash away the inclusions and bubbles at the front edge of the solidified shell, promote the inclusions and bubbles to float to a meniscus, and reduce the content of the defects such as the inclusions and the bubbles in the solidified shell. As can be seen from fig. 1 and 2, in general, the flow direction of molten steel generated by stirring and the circulation direction of molten steel discharged from the nozzle do not interfere with each other, so that excellent process stability can be obtained in the actual production process. In the actual production process, the electromagnetic stirring parameters can be controlled well according to the change of working conditions, so that the movement speed of the molten steel is controlled, and the ideal stirring effect is finally achieved.
Aiming at the production conditions in the embodiment, in the production process, the lower electromagnetic stirrer needs to be started, and the average magnetic induction intensity of the travelling wave magnetic field generated by the lower electromagnetic stirrer at the 15mm front edge of the narrow-face width-adjusting copper plate of the crystallizer reaches over 1000 Gauss. The lower electromagnetic stirrer has the main function of slowing down the flow velocity of the lower circular flow molten steel stream, and plays a role in actively reducing the downward impact depth of the molten steel in the invention. The reduction of the impact depth of the lower circular flow and the reduction of the flow velocity of the lower circular flow greatly improve the floating condition of non-metallic inclusions and bubbles in the molten steel, thereby being beneficial to the floating of the non-metallic inclusions and the bubbles, reducing the probability of capturing the non-metallic inclusions and the bubbles by a solidified billet shell and further improving the quality of a final continuous casting billet. Compared with a continuous casting process adopting electromagnetic braking at the lower part, the lower part adopts the electromagnetic stirrer to actively adjust the molten steel flow field in the crystallizer within a larger flow velocity interval, so that a better metallurgical effect is obtained.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A crystallizer flow field electromagnetic control method for slab continuous casting production is characterized in that:
controlling a flow field of the crystallizer by adopting a plurality of sets of electromagnetic stirrers, wherein the electromagnetic stirrers are traveling wave magnetic field generators, the electromagnetic stirrers are respectively arranged in the upper area of the wide surface of the crystallizer and the lower area of the narrow surface of the crystallizer, the upper electromagnetic stirrer is arranged between the upper edge of the water gap outlet and a meniscus, and the lower electromagnetic stirrer is arranged below an impact point of a water gap side hole spitting stream and the narrow surface; the upper and lower electromagnetic stirrers are respectively powered by two sets of power supplies and can respectively and independently control the current intensity;
the magnetic fields of the upper electromagnetic stirrer at the two sides of the wide surface of the crystallizer respectively drive the molten steel to do relative horizontal motion, the upper electromagnetic stirrer covers the area from the upper edge of the water gap outlet to the meniscus, the coverage ratio is greater than 0.75, namely the ratio of the height of the iron core of the upper electromagnetic stirrer to the distance from the upper edge of the water gap outlet to the meniscus is greater than 0.75;
the lower electromagnetic stirrer is provided with two groups of stirring coils which are respectively positioned on one side of the narrow surface of the crystallizer, the upper edge of the iron core of the lower electromagnetic stirrer and the intersection point of a straight line which takes the upper edge of a water gap outlet as a starting point and the angle of the water gap outlet as an angle and the narrow surface of the crystallizer are positioned at the same height, and the stirring direction of each group of stirring coils is opposite to the stream direction of lower circular flow along the narrow edge from bottom to top so as to weaken the impact depth of the lower circular flow stream;
when the width of the plate blank is changed, the lower electromagnetic stirrer and the width-adjusting copper plate of the crystallizer move together in the horizontal direction; in the vertical direction, the upper edge of the lower electromagnetic stirrer is always at the same height with the intersection point of a straight line which takes the upper edge of the water gap outlet as a starting point and the angle of the water gap outlet as an angle and the narrow surface of the crystallizer by utilizing the lifting mechanism to adjust the upper and lower positions of the lower electromagnetic stirrer.
2. A crystallizer flow field electromagnetic control method for slab continuous casting production is characterized in that:
controlling a flow field of the crystallizer by adopting a plurality of sets of electromagnetic stirrers, wherein the electromagnetic stirrers are traveling wave magnetic field generators, the electromagnetic stirrers are respectively arranged in the upper area of the wide surface of the crystallizer and the lower area of the narrow surface of the crystallizer, the upper electromagnetic stirrer is arranged between the upper edge of the water gap outlet and a meniscus, and the lower electromagnetic stirrer is arranged below an impact point of a water gap side hole spitting stream and the narrow surface; the upper and lower electromagnetic stirrers are respectively powered by two sets of power supplies and can respectively and independently control the current intensity;
the magnetic fields of the upper electromagnetic stirrer at the two sides of the wide surface of the crystallizer respectively drive the molten steel to do relative horizontal motion, the upper electromagnetic stirrer covers the area from the upper edge of the water gap outlet to the meniscus, the coverage ratio is greater than 0.75, namely the ratio of the height of the iron core of the upper electromagnetic stirrer to the distance from the upper edge of the water gap outlet to the meniscus is greater than 0.75;
the lower electromagnetic stirrer is provided with four groups of stirring coils, each crystallizer wide surface is provided with two groups of stirring coils, and the two groups of stirring coils on the same crystallizer wide surface are respectively close to the two narrow surfaces of the crystallizer and are symmetrically arranged by taking the vertical center line of the crystallizer as an axis; two groups of stirring coils which are close to the narrow surface of the same crystallizer and are respectively positioned on the two wide surfaces of the crystallizer are arranged in a face-to-face manner; the upper edge of the lower electromagnetic stirrer iron core and the intersection point of a straight line which takes the upper edge of a water gap outlet as a starting point and takes the angle of the water gap outlet as an angle and the narrow surface of the crystallizer are positioned at the same height, the stirring direction of each group of stirring coils is from bottom to top and is opposite to the stream direction of the lower circular stream along the narrow edge, and the lower circular stream is used for weakening the impact depth of the lower circular stream;
when the width of the plate blank is changed, the relative positions of the stirring coil and the width-adjusting copper plate of the crystallizer are kept constant by the lower electromagnetic stirrer in the horizontal direction; in the vertical direction, the lower electromagnetic stirrer keeps the upper edge of the iron core of the stirring coil at the same height with the intersection point of a straight line which takes the upper edge of a water gap outlet as a starting point and takes the angle of the water gap outlet as an angle and a narrow surface of the crystallizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710107016.6A CN108500227B (en) | 2017-02-27 | 2017-02-27 | Crystallizer flow field electromagnetic control method for slab continuous casting production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710107016.6A CN108500227B (en) | 2017-02-27 | 2017-02-27 | Crystallizer flow field electromagnetic control method for slab continuous casting production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108500227A CN108500227A (en) | 2018-09-07 |
| CN108500227B true CN108500227B (en) | 2020-09-25 |
Family
ID=63373065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710107016.6A Active CN108500227B (en) | 2017-02-27 | 2017-02-27 | Crystallizer flow field electromagnetic control method for slab continuous casting production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108500227B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109604551B (en) * | 2019-01-14 | 2020-08-25 | 辽宁石油化工大学 | Independent adjustable combined electromagnetic braking device and method for controlling molten steel flow |
| CN110303126A (en) * | 2019-08-09 | 2019-10-08 | 湖南中科电气股份有限公司 | A kind of intelligence slab electromagnetic stirring system |
| CN113862418A (en) * | 2020-06-30 | 2021-12-31 | 宝山钢铁股份有限公司 | CSP production method of crack-resistant bridge steel |
| CN112296294B (en) * | 2020-09-30 | 2022-09-13 | 首钢集团有限公司 | Method for improving cleanliness of plate blank |
| CN112296296A (en) * | 2020-09-30 | 2021-02-02 | 首钢集团有限公司 | Method for controlling liquid level fluctuation of slab crystallizer |
| CN113102711A (en) * | 2021-04-01 | 2021-07-13 | 中国第一重型机械股份公司 | Method and device for producing forged piece |
| CN113441694A (en) * | 2021-05-20 | 2021-09-28 | 山东创新金属科技有限公司 | Casting platform for aluminum alloy electromagnetic stirring continuous ingot casting |
| CN115194113B (en) * | 2022-06-21 | 2023-10-13 | 首钢集团有限公司 | Adjustment method of slab crystallizer |
| CN115194107B (en) * | 2022-07-13 | 2023-05-16 | 沈阳工程学院 | Multi-stage independent adjustable composite magnetic field device and method for controlling metal liquid flow |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0596349A (en) * | 1991-10-04 | 1993-04-20 | Kawasaki Steel Corp | Method for continuously casting steel using magneto static field conducting method |
| JPH0671401A (en) * | 1992-08-28 | 1994-03-15 | Nippon Steel Corp | Controller for fluid of molten steel in continuous casting mold |
| JP3096879B2 (en) * | 1993-10-14 | 2000-10-10 | 新日本製鐵株式会社 | Continuous casting method for slabs with excellent surface and internal quality |
| JP3522497B2 (en) * | 1997-07-04 | 2004-04-26 | 新日本製鐵株式会社 | Steel continuous casting method |
| JP2000061599A (en) * | 1998-08-26 | 2000-02-29 | Sumitomo Metal Ind Ltd | Continuous casting method |
| JP3566904B2 (en) * | 1999-04-20 | 2004-09-15 | 新日本製鐵株式会社 | Steel continuous casting method |
| JP2002263800A (en) * | 2001-03-13 | 2002-09-17 | Nippon Steel Corp | Apparatus and system for controlling fluidity of molten metal |
| JP5026204B2 (en) * | 2007-09-13 | 2012-09-12 | 新日本製鐵株式会社 | Steel continuous casting method |
| JP5716440B2 (en) * | 2011-02-10 | 2015-05-13 | 新日鐵住金株式会社 | Slab manufacturing method and slab with excellent surface quality |
| CN202517018U (en) * | 2012-02-20 | 2012-11-07 | 上海大学 | Electromagnetic stirring device of continuous casting crystallizer |
-
2017
- 2017-02-27 CN CN201710107016.6A patent/CN108500227B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108500227A (en) | 2018-09-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108500227B (en) | Crystallizer flow field electromagnetic control method for slab continuous casting production | |
| CN108500228B (en) | Flow field control method for slab continuous casting crystallizer | |
| EP0401504B2 (en) | Apparatus and method for continuous casting | |
| KR100376504B1 (en) | Continuous casting method and continuous casting apparatus used | |
| CN109604551A (en) | A kind of individually adjusted combination electro-magnetic braking device and method controlling molten steel flow | |
| EP3441158B1 (en) | Vertical electromagnetic braking device for controlling flow of molten steel in continuous casting crystallizer | |
| CN203541512U (en) | Braking type submerged nozzle used for continuous casting of plate blanks or shaped blanks | |
| CN211758438U (en) | Submersed nozzle for high-speed continuous casting of small square billets | |
| CN115194107B (en) | Multi-stage independent adjustable composite magnetic field device and method for controlling metal liquid flow | |
| CN116237483A (en) | Continuous casting method combining crystallizer immersion nozzle structure and process | |
| CN110773731A (en) | Improve immersion side nozzle for continuous casting in crystallizer flow field | |
| CN212239170U (en) | Submersed nozzle brick capable of reducing slag rolling of sheet billet crystallizer | |
| CN203541470U (en) | Braking type submerged nozzle used for mass production | |
| CN203209684U (en) | Six-hole submerged nozzle for pouring large square blank | |
| CN114932206B (en) | Independently controllable composite magnetic field device and method for controlling molten metal flow in crystallizer | |
| JPS61193755A (en) | Electromagnetic stirring method | |
| CN203316714U (en) | Spinning-type turbulence controller for continuous casting tundish | |
| CN2504014Y (en) | Electromagnetic brake of continuous cast molten pool liquid wave | |
| CN201603853U (en) | Quadripuntal submersed nozzle used for pouring conventional plate blank and preventing molten steel turbulence | |
| CN106623879B (en) | A kind of T-type tundish flow control device | |
| CN105689698A (en) | Braking-type submerged nozzle for beam blank continuous casting | |
| CN110270669B (en) | Method for deformation of meniscus of slab crystallizer under condition of magnetic pressure constraint control of high pulling speed | |
| CN210208631U (en) | Molten steel current stabilizer | |
| CN208906299U (en) | Submersed nozzle with oval cross section | |
| CN111215617A (en) | Submersed nozzle for high-speed continuous casting of small square billets |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |