CN108284208B - self-adaptive pulling speed change electromagnetic stirring system and stirring method - Google Patents
self-adaptive pulling speed change electromagnetic stirring system and stirring method Download PDFInfo
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- CN108284208B CN108284208B CN201710013707.XA CN201710013707A CN108284208B CN 108284208 B CN108284208 B CN 108284208B CN 201710013707 A CN201710013707 A CN 201710013707A CN 108284208 B CN108284208 B CN 108284208B
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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
- B22D11/16—Controlling or regulating processes or operations
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Abstract
The invention discloses an electromagnetic stirring system adaptive to pulling speed change and a stirring method thereof, which are connected with a continuous casting control system and comprise a crystallizer body, a stirring mechanism, a speed measuring mechanism, an intelligent processing module and a PLC (programmable logic controller), wherein the crystallizer body is used for flowing molten steel, the stirring mechanism and the speed measuring mechanism are both arranged on the crystallizer body, the intelligent processing module is respectively connected with the speed measuring mechanism and the continuous casting control system and is used for monitoring and reading the real-time flow rate of the molten steel and calculating related process parameters, the PLC is respectively connected with the intelligent processing module and the stirring mechanism, and the PLC receives the process parameters calculated by the intelligent processing module and controls the stirring mechanism to execute the process parameters on the molten steel in the crystallizer body.
Description
Technical Field
The invention relates to electromagnetic stirring in slab continuous casting, in particular to an self-adaptive pulling speed change electromagnetic stirring system and a stirring method.
Background
In the production of metal plate blanks, in order to improve the surface and internal quality of casting blanks, electromagnetic stirring is usually applied to liquid metal in a crystallizer, the basic principle of the electromagnetic stirring is that alternating magnetic fields are generated by induction after alternating current is conducted in the stirrer, the alternating magnetic fields can induce and generate current in the liquid metal, and Lorentz force is generated between the induced and generated current and the alternating magnetic fields, the liquid metal flows along the direction of the resultant external force of the acting force under the action of the Lorentz force, aspects are provided, the flow field under the action of the electromagnetic stirring flushes a solid-liquid interface, and is beneficial to floating removal of defects such as inclusions and bubbles, so that the quality of the casting blanks is improved, aspects are provided, the components and the temperature of the metal liquid are homogenized under the action of the electromagnetic stirring, the solidification core of the solid-liquid interface is increased, the crystal grains of the casting blanks are beneficial to refining.
With the development of crystallizer electromagnetic stirring technology, a new -generation electromagnetic stirring technology is proposed, for example, patents CN201080019323 and CN201080019325 both propose electromagnetic stirring methods, wherein an upper magnetic pole and a lower magnetic pole are adopted, the upper magnetic pole performs electromagnetic stirring on molten steel, and the lower magnetic pole performs electromagnetic braking on the molten steel.
In addition, in the existing slab continuous casting production, a continuous casting machine is compatible with steel grades with multiple components, the maximum casting speeds (namely the casting speeds) of different steel grades are different, when the casting speeds are changed, if the same electromagnetic stirring process is adopted, insufficient stirring or excessive stirring can occur, so that the components and the temperature of molten steel are not uniform in the solidification process, bubbles and inclusions in the molten steel are difficult to float upwards and remove, subcutaneous defects are easy to generate, and the phenomena of liquid level slag entrapment and the like can occur if the stirring is excessive, so that the quality and the performance of the slab are seriously deteriorated. In addition, for the slab production process with different components and different pulling speeds, the existing electromagnetic stirring technology only considers the electromagnetic stirring function, can not determine different electromagnetic stirring processes according to the pulling speed, and has great difficulty in real-time and accurate manual intervention.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide electromagnetic stirring systems and stirring methods capable of adaptively adjusting the pulling speed change condition in the slab continuous casting process, so that a better electromagnetic stirring effect is obtained, and stable production of high-quality casting slabs is facilitated.
In order to achieve the purpose, the invention adopts the following technical scheme:
, electromagnetic stirring systems adaptive to pulling speed change are connected with a continuous casting control system and comprise a crystallizer body, a stirring mechanism, a speed measuring mechanism, an intelligent processing module and a PLC (programmable logic controller), wherein the crystallizer body is used for flowing molten steel, the stirring mechanism and the speed measuring mechanism are both arranged on the crystallizer body, the intelligent processing module is respectively connected with the speed measuring mechanism and the continuous casting control system and is used for monitoring and reading the real-time flow rate of the molten steel and calculating related process parameters, the PLC is respectively connected with the intelligent processing module and the stirring mechanism, and the PLC receives the process parameters calculated by the intelligent processing module and controls the stirring mechanism to execute the process parameters on the molten steel in the crystallizer body;
the stirring mechanism comprises an electromagnetic stirrer and an electromagnetic brake, the electromagnetic stirrer is arranged on the outer side surface of the crystallizer body, and the electromagnetic brake is also arranged on the outer side surface of the crystallizer body and is arranged below the electromagnetic stirrer;
the speed measuring mechanism comprises a plurality of speed measuring probes which are respectively used for measuring the flow velocity of the molten steel between the electromagnetic stirrers and the flow velocity of the molten steel between the electromagnetic brakes.
And a water gap is arranged at the top end of the crystallizer body.
And a magnetic insulating plate is arranged between the electromagnetic brakes on the same side.
The speed measuring probes are four, two of the speed measuring probes are used for measuring the flow velocity of the molten steel between the electromagnetic stirrers, and the other two speed measuring probes are used for measuring the flow velocity of the molten steel between the electromagnetic brakes.
The number of the electromagnetic stirrers is 1-6.
The number of the electromagnetic brakes is 2-8.
In another aspect, adaptive pulling rate changing electromagnetic stirring methods include the following steps:
s1, when casting starts, molten steel flows into a crystallizer body from a water gap, then real-time monitoring data of a throwing speed is sent to an intelligent processing module from a continuous casting control system, the intelligent processing module calculates a difference value between a pulling speed value and a pulling speed default value, and then a proportioning mode of a stirring mechanism is calculated according to the difference value intelligent processing module;
s2, after casting is stable, speed measuring probes arranged on the crystallizer body measure horizontal flow velocity distribution at different heights in the crystallizer body, two speed measuring probes in the speed measuring mechanism measure the speed of a flow field in an electromagnetic stirring area above the crystallizer body, the other two speed measuring probes measure the speed of the flow field in an electromagnetic braking area below the crystallizer body, and data of the speed of each flow field is transmitted to the intelligent processing module in real time;
s3, the intelligent processing module respectively calculates the flow field speeds of the electromagnetic stirring area and the electromagnetic braking area, and sends the calculated technological parameter instructions of the stirring intensity and the braking intensity to the PLC;
and S4, when the blank drawing speed is increased or reduced, the stirring strength and the braking strength are correspondingly increased or reduced, so that the self-adaptive adjustment of the blank drawing speed in the slab continuous casting process is realized.
In the step S1, when the difference is not greater than 0, the proportioning mode is an electromagnetic stirring mode, that is, only the upper electromagnetic stirrer needs to be started, and the electromagnetic brake does not need to be started; when the difference value is more than 0, the proportioning mode is an electromagnetic stirring and electromagnetic braking mode, namely the electromagnetic stirrer is started at the upper part, the electromagnetic brake is started at the lower part, and the electromagnetic stirring intensity and the electromagnetic braking intensity are enhanced along with the increase of the difference value.
In step S3, when the flow velocity difference in the crystallizer body plate width direction is greater than a predetermined value with respect to the flow field velocity in the stirrer region, the stirring current of the electromagnetic stirrer is increased, the stirring intensity in the region with a smaller flow velocity is increased, and the stirring intensity in the region with a larger flow velocity is decreased until the flow velocity difference in the crystallizer body plate width direction is less than the predetermined value, and when the flow field velocity in the electromagnetic braking region is greater than the average velocity, the local braking intensity is increased.
In the step S4, if the difference between the flow field velocities in the width direction of the crystallizer body plate in the electromagnetic stirring area is smaller than the set value, the electromagnetic stirring intensity may be temporarily not adjusted, but the electromagnetic braking intensity needs to be adjusted accordingly according to the increase or decrease of the blank drawing speed.
In the technical scheme, the invention also has the following beneficial effects:
1. the invention can realize the automatic adjustment of the electromagnetic stirring parameters in the slab continuous casting process, can self-adapt to the pulling speed change and the pulling speed fluctuation in the production process, and is suitable for different components, types and continuous casting process parameters, and the application range is ;
2. the electromagnetic braking part is designed independently and separately, and the magnetic field intensity and direction of the electromagnetic braking can be independently adjusted according to the actual process requirement;
3. the invention can realize the online optimization and adjustment of the electromagnetic stirring parameters and is easy to realize automation.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the electromagnetic stirrer distribution and electromagnetic stirring zone flow field in the present invention;
fig. 3 is a schematic diagram of the electromagnetic brake distribution and electromagnetic brake area flow field in the present invention.
Detailed Description
The technical solution of the present invention is further illustrated in below with reference to the drawings and examples.
Please refer to fig. 1 to 3, the kinds of electromagnetic stirring systems with adaptive pulling rate variation provided by the present invention are connected to a continuous casting control system, and include a crystallizer body 1, a stirring mechanism, a speed measuring mechanism, an intelligent processing module and a PLC, wherein the crystallizer body 1 is used for flowing molten steel through a water gap 2 arranged at the top of the crystallizer body, the stirring mechanism and the speed measuring mechanism are both arranged on the crystallizer body 1, the intelligent processing module is respectively connected to the speed measuring mechanism and the continuous casting control system for monitoring and reading the real-time horizontal flow rate of the molten steel and calculating the related process parameters, the PLC is respectively connected to the intelligent processing module and the stirring mechanism, and the PLC receives the process parameters calculated by the intelligent processing module and controls the stirring mechanism to execute the process parameters on the molten steel in the crystallizer body.
Preferably, the stirring mechanism includes an electromagnetic stirrer 3 and an electromagnetic brake 4, the electromagnetic stirrer 3 is disposed on the outer side surface of the mold body 1, and the electromagnetic brake 4 is also disposed on the outer side surface of the mold body 1 and both disposed below the electromagnetic stirrer 3.
The invention adopts the combination of a speed measuring mechanism and an electromagnetic stirring mechanism of liquid metal to automatically generate an electromagnetic stirring scheme and output an execution instruction, the blank drawing speed can be correspondingly adjusted when steel grades with different components are switched in the casting process, the speed measuring mechanism measures the flow speed in the crystallizer body 1, the flow field data is fed back to an intelligent processing module, the intelligent processing module calculates the flow speed distribution condition, judges the stirring input mode, gives out execution parameters, and executes the electromagnetic stirring process through a PLC (programmable logic controller). The speed measuring mechanism detects the longitudinal speed and the horizontal speed in the crystallizer body 1, and determines an electromagnetic stirring proportioning mode through the flow speed detection of the longitudinal speed, namely the upper electromagnetic stirring intensity and the lower electromagnetic braking intensity; and determining an electromagnetic stirring scheme through the flow velocity detection of the transverse velocity, and outputting the electromagnetic stirring scheme optimized in real time through the intelligent processing module and the PLC.
Preferably, the speed measuring mechanism comprises a plurality of speed measuring probes 5 which are respectively used for measuring the flow velocity of the molten steel between the electromagnetic stirrers 3 and the flow velocity of the molten steel between the electromagnetic brakes 4, in the embodiment, four speed measuring probes 5 are arranged, two speed measuring probes are used for measuring the horizontal velocities of two sides of the wide surface of the crystallizer body 1 in the area between the upper electromagnetic stirrers 3, the area is close to the free liquid surface of the molten steel, the flow field mainly presents single-cycle circumferential flow under the action of the electromagnetic stirrers 3, the flow velocities of two sides of the wide surface of the crystallizer body 1 are basically equal in magnitude and opposite in direction, the other two speed measuring probes are used for measuring the horizontal flow velocity distribution of two sides of the wide surface of the crystallizer body 1 in the braking area between the lower electromagnetic brakes 4, the flow field structure of the molten steel area is complex, the flow field structure of the area is , the flow field is influenced by the single-cycle flow field of the electromagnetic stirring area and presents cycle flow in the circumferential direction, the flow field is influenced by the jet flow of the water gap 2, the flow field flows to the two.
For the use form of the electromagnetic stirrers 3, the integral electromagnetic stirrers 3 can be adopted, the zoned stirring can also be adopted, the number of the zoned electromagnetic stirrers 3 can be selected from 1 to 6, the electromagnetic brakes 4 can be selected from 2 to 8 according to the process requirements, and the magnetic insulating plates 6 are arranged between the electromagnetic brakes 4 on the same side to prevent the electromagnetic influence between the electromagnetic brakes 4 on the same side.
In another aspect, the adaptive pulling rate varying electromagnetic stirring methods provided by the present invention comprise the following steps:
s1, when casting starts, molten steel flows into a crystallizer body 1 from a water gap 2, then real-time monitoring data of a throwing speed is sent to an intelligent processing module from a continuous casting control system, the intelligent processing module calculates a difference value between a pulling speed value and a pulling speed default value, and then a proportioning mode of a stirring mechanism is calculated according to the difference value intelligent processing module; when the difference value is less than or equal to 0, the proportioning mode is an electromagnetic stirring mode, namely, only the upper electromagnetic stirrer 3 needs to be started, and the electromagnetic brake 4 does not need to be started; when the difference is more than 0, the proportioning mode is an electromagnetic stirring and electromagnetic braking mode, namely the electromagnetic stirrer 3 is started at the upper part, the electromagnetic brake 4 is started at the lower part, and the electromagnetic stirring intensity and the electromagnetic braking intensity are enhanced along with the increase of the difference.
S2, after casting is stable, speed measuring probes 5 arranged on the crystallizer body 1 measure horizontal flow velocity distribution at different heights in the crystallizer body 1, two speed measuring probes 5 in a speed measuring mechanism measure the speed of a flow field of an electromagnetic stirring area above the crystallizer body 1, the area is close to the free liquid level of molten steel, the flow field mainly presents single-cycle circumferential flow (such as the direction of arrow flow in a figure 2) under the action of an electromagnetic stirrer 3, the flow velocities on two sides of a wide surface of the crystallizer body 1 are basically equal in size and opposite in direction, the other two speed measuring probes 5 measure the speed of the flow field of an electromagnetic braking area below the crystallizer body 1, the flow field structure of the area is complex, the flow field is influenced by the single-cycle flow field of the electromagnetic stirring area in the circumferential direction (such as the direction of a dotted arrow in a figure 3), the flow field is influenced by jet flow of a water gap 2 in the other aspect, the flow flows to narrow surfaces on two sides of the crystallizer body 1 (such as the direction of the arrow in the figure 3), the flow field is comprehensively influenced by the circumferential direction of the jet flow presented and the jet flow field on two sides of the electromagnetic braking area can have fixed.
S3, the intelligent processing module respectively calculates the flow field speeds of the electromagnetic stirring area and the electromagnetic braking area, and sends the calculated technological parameter instructions of the stirring intensity and the braking intensity to the PLC; for the flow field speed of the stirrer area, when the flow speed difference in the width direction of the crystallizer body 1 is greater than a set value, the stirring current of the electromagnetic stirrer 3 is increased, the stirring intensity of the area with a smaller flow speed is increased, and the stirring intensity of the area with a larger flow speed is reduced until the flow speed difference in the width direction of the crystallizer body 1 is less than the set value, and for the flow field of the electromagnetic braking area, when the flow speed in the width direction of the crystallizer body 1 is greater than an average speed, the local braking intensity is increased.
S4, when the blank drawing speed is increased or reduced, the stirring strength and the braking strength are correspondingly increased or reduced, and the self-adaptive adjustment of the blank drawing speed in the slab continuous casting process is realized; if the flow field velocity difference in the width direction of the crystallizer body 1 in the electromagnetic stirring area is smaller than a set value, the electromagnetic stirring intensity can be temporarily not adjusted, but the electromagnetic braking intensity needs to be correspondingly adjusted according to the increase or decrease of the throwing speed.
The electromagnetic stirring system and the stirring method thereof realize the self-adaptive regulation of the pulling speed in the continuous casting process of the plate blank, further realize the production of high-quality continuous casting plate blank, have better process adaptability, thereby achieving better stirring effect and having better application prospect of .
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (4)
1, electromagnetic stirring method with self-adaptive pulling speed change, which is characterized by comprising the following steps:
s1, when casting starts, molten steel flows into a crystallizer body from a water gap, then real-time monitoring data of a throwing speed is sent to an intelligent processing module from a continuous casting control system, the intelligent processing module calculates a difference value between a pulling speed value and a pulling speed default value, and then a proportioning mode of a stirring mechanism is calculated according to the difference value intelligent processing module;
s2, after casting is stable, speed measuring probes arranged on the crystallizer body measure horizontal flow velocity distribution at different heights in the crystallizer body, two speed measuring probes in the speed measuring mechanism measure the speed of a flow field in an electromagnetic stirring area above the crystallizer body, the other two speed measuring probes measure the speed of the flow field in an electromagnetic braking area below the crystallizer body, and data of the speed of each flow field is transmitted to the intelligent processing module in real time;
s3, the intelligent processing module respectively calculates the flow field speeds of the electromagnetic stirring area and the electromagnetic braking area, and sends the calculated technological parameter instructions of the stirring intensity and the braking intensity to the PLC;
and S4, when the blank drawing speed is increased or reduced, the stirring strength and the braking strength are correspondingly increased or reduced, so that the self-adaptive adjustment of the blank drawing speed in the slab continuous casting process is realized.
2. The adaptive pulling rate varying electromagnetic stirring method of claim 1, wherein in step S1, when the difference is ≤ 0, the proportioning mode is electromagnetic stirring mode, i.e., only the upper electromagnetic stirrer needs to be activated and the electromagnetic brake does not need to be activated, and when the difference is > 0, the proportioning mode is electromagnetic stirring plus electromagnetic braking mode, i.e., the upper electromagnetic stirrer is activated, the lower electromagnetic brake is activated, and the electromagnetic stirring intensity and the electromagnetic braking intensity increase with the increase of the difference.
3. The adaptive pulling rate varying electromagnetic stirring method of claim 1, wherein in step S3, when the difference between the flow velocities in the width direction of the crystallizer body plate is greater than a predetermined value, the stirring current of the electromagnetic stirrer is increased, the stirring intensity in the region with a smaller flow velocity is increased, the stirring intensity in the region with a larger flow velocity is decreased, until the difference between the flow velocities in the width direction of the crystallizer body plate is less than the predetermined value, and when the velocity in the width direction of the crystallizer body plate is greater than the average velocity, the local braking intensity is increased in the flow field in the electromagnetic braking region.
4. The adaptive pulling rate variation electromagnetic stirring method of claim 1, wherein in step S4, if the flow field velocity difference in the width direction of the crystallizer body plate in the electromagnetic stirring area is less than a predetermined value, the electromagnetic stirring intensity is temporarily not adjusted, but the electromagnetic braking intensity is adjusted accordingly according to the increase or decrease of the pulling speed.
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| CN110014130B (en) * | 2019-05-22 | 2020-10-20 | 湖南中科电气股份有限公司 | Control method and control system for electromagnetic stirring of steel continuous casting crystallizer |
| CN110625079B (en) * | 2019-10-21 | 2020-12-15 | 北京科技大学 | Intelligent continuous casting electromagnetic stirring online control system and method |
| 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 |
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