CN116511439A - Experimental device and method for preparing initial solidification shell of crystallizer permanent magnet stirring square billet - Google Patents
Experimental device and method for preparing initial solidification shell of crystallizer permanent magnet stirring square billet Download PDFInfo
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- CN116511439A CN116511439A CN202310317136.4A CN202310317136A CN116511439A CN 116511439 A CN116511439 A CN 116511439A CN 202310317136 A CN202310317136 A CN 202310317136A CN 116511439 A CN116511439 A CN 116511439A
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- 238000003756 stirring Methods 0.000 title claims abstract description 87
- 238000007711 solidification Methods 0.000 title claims abstract description 42
- 230000008023 solidification Effects 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 26
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 73
- 229910052802 copper Inorganic materials 0.000 claims abstract description 73
- 239000010949 copper Substances 0.000 claims abstract description 73
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 66
- 239000010959 steel Substances 0.000 claims abstract description 66
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 239000002893 slag Substances 0.000 claims description 36
- 238000002474 experimental method Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 239000002436 steel type Substances 0.000 claims description 4
- 238000005266 casting Methods 0.000 abstract description 9
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000003760 magnetic stirring Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000011020 pilot scale process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The utility model discloses an experimental device and method for preparing initial solidification blank shells of a crystallizer permanent magnet stirring square blank, wherein the device comprises a control system, a crucible, a heating furnace for heating the crucible, a permanent magnet stirring module for realizing permanent magnet stirring of molten steel in the crucible, a crystallizer and a blank pulling module matched with the crystallizer, wherein the crystallizer is matched with a crystallizer copper mold, and the control system is respectively and electrically connected with the heating furnace, the permanent magnet stirring module and the blank pulling module. The device and the method can simulate the preparation of the square billet initial solidification shell of the crystallizer under different permanent magnet stirring conditions, have the advantages of simple structure, simplicity and convenience in maintenance, low cost and diversification of magnetic field modes, improve the controllability of the casting blank quality and improve the casting blank quality. The method can be used for researching the influence of permanent magnet stirring of the crystallizer on the initial solidification shell of the square billet, is used for researching the optimal permanent magnet stirring conditions of the crystallizer for different steel grades, and provides guidance for industrial application of the permanent magnet stirring of the crystallizer.
Description
Technical Field
The utility model belongs to the technical field of blank shell preparation, and particularly relates to an experimental device and method for preparing a crystallizer permanent magnet stirring square blank initial solidification blank shell.
Background
The surface and internal defects of the casting blank are closely related to the flowing state of molten steel in the crystallizer, and researches show that nearly 80% of the surface defects of the casting blank originate from the crystallizer. Therefore, controlling and improving the flow of molten steel in a crystallizer is important to improve the quality of casting billets, particularly the surface quality. The electromagnetic stirring of the crystallizer can strengthen the flow of molten steel during pouring and solidification initiation, strengthen the heat transfer of the molten steel in the crystallizer, reduce the superheat degree of the molten steel, further realize the control of the surface (blank shell) quality of a solidified blank, and get the wide attention of metallurgical workers.
However, electromagnetic stirring requires high-power variable-frequency current to generate an alternating magnetic field, and has the advantages of complex equipment, high energy consumption and high maintenance cost; meanwhile, in order to prevent the coil from overheating, flowing water is needed to be used for cooling, on one hand, cooling water takes away the Joule heat of the coil, and electric energy is wasted; on the other hand, despite the use of high quality cooling water, the life of the coil is still short, not exceeding one year, requiring frequent replacement. With the continuous improvement of the performance of magnetic materials, permanent magnetic stirring has become an effective alternative method for electromagnetic stirring. Research shows that the electric energy consumption of permanent magnetic stirring is only one tenth of that of electromagnetic stirring. Therefore, the development of the permanent magnet stirring technology has important significance for reducing the energy consumption and saving the production and operation cost for enterprises.
The test result of the permanent magnetic stirring at the solidification tail end of the small square billet high-carbon cord steel shows that the permanent magnetic stirring at the solidification tail end can reduce carbon segregation in the small square billet, and the energy-saving effect is remarkable. Patent CN108580803a discloses a permanent magnet stirrer at the solidification end of a casting blank of a steelmaking continuous casting machine, and the purpose of stirring a steel blank liquid core is achieved by driving a permanent magnet to rotate through a hydraulic motor. However, the application of the crystallizer permanent magnet stirring technology is rarely reported. The utility model patent CN212419548U discloses a casting blank crystallizer of a steelmaking continuous casting machine, wherein a permanent magnet stirrer is arranged outside the crystallizer, and a hydraulic motor is adopted to drive a permanent magnet to rotate so as to realize stirring. The motion mode of the magnetic field of the patent is single, and the requirements of actual production problems can not be solved by simply replacing permanent magnetic stirring and electromagnetic stirring.
In order to study the influence of permanent magnet stirring of a crystallizer on an initial solidification blank shell, the most ideal method is an industrial field experiment or a small pilot-scale continuous casting machine experiment, but the method has the problems of high experimental risk, high raw material consumption, high energy consumption, influence on a normal production flow, overhigh experimental cost and the like. In addition, some researchers simulate the role of permanent magnet stirring in initial solidification of a crystallizer by establishing a mathematical model, but the methods are based on certain assumptions, and all the factors can influence the correctness of simulation results because all the factors are required to be comprehensive and accurate, and the simulation results often have difficulty in comprehensively and accurately explaining the problem of forming initial solidification shells containing complex, multiphase and instantaneous three-way-one-way-reverse phenomena in the crystallizer. In order to practically study the influence of permanent magnet stirring of a crystallizer on initial solidification of molten steel and realize industrial landing application of the permanent magnet stirring of the crystallizer, a new thought and a new method are needed.
Disclosure of Invention
In view of the above, the utility model aims to provide an experimental device and a method for preparing a square billet initial solidification shell of a crystallizer by permanent magnet stirring, which can simulate the preparation of the square billet initial solidification shell of the crystallizer under different permanent magnet stirring conditions, and have the advantages of simple structure, simple maintenance, low cost and diversified magnetic field modes, so as to improve the controllability of the casting blank quality and the casting blank quality. The method can be used for researching the influence of permanent magnet stirring of the crystallizer on the initial solidification shell of the square billet, is used for researching the optimal permanent magnet stirring conditions of the crystallizer for different steel grades, and provides guidance for industrial application of the permanent magnet stirring of the crystallizer.
The utility model solves the problems by the following technical means:
the utility model relates to an experimental device for preparing initial solidification shells of permanent magnet stirring square billets of a crystallizer, which comprises a control system, a crucible for containing molten steel, a heating furnace for heating the crucible, a permanent magnet stirring module for realizing permanent magnet stirring of molten steel in the crucible, the crystallizer and a billet pulling module matched with the crystallizer, wherein the crystallizer is matched with a copper mold of the crystallizer, and the control system is respectively and electrically connected with the heating furnace, the permanent magnet stirring module and the billet pulling module.
Further, the heating furnace is matched with a heating body and a thermocouple.
Further, the crucible comprises an outer pot body and an inner pot body which are assembled in a sleeved mode, and the thermocouple is arranged between the outer pot body and the inner pot body.
Further, the crystallizer copper mold vibration motor is used for driving the crystallizer copper mold to vibrate, and the crystallizer copper mold vibration motor is electrically connected with the control system.
In a second aspect, the utility model relates to an experimental method for preparing a square billet initial solidification shell by adopting the device, comprising the following steps:
1) Placing 20-25kg of required experimental steel in a crucible, placing the crucible in a heating furnace, and adjusting the height of a permanent magnet module according to the experimental steel types and experimental requirements to realize the control of the magnetic field intensity at the crucible;
2) Starting a heating furnace to melt experimental steel, and keeping the temperature above 30-70 ℃ of liquidus temperature of the used steel grade; starting permanent magnet stirring, adjusting stirring speed, and ensuring that the components and temperature of molten steel are uniform; then adding crystallizer protection slag matched with the steel grade into molten steel, forming a crystallizer protection slag layer after the crystallizer protection slag layer is completely melted, and measuring the temperature of the crystallizer protection slag layer;
3) Slowly inserting a crystallizer copper mold into a molten pool, starting a crystallizer copper mold vibration motor, driving the crystallizer copper mold to vibrate according to a set vibration frequency and a set vibration amplitude, rapidly cooling a crystallizer protection slag layer on the crystallizer copper mold to form a protection slag film, and rapidly solidifying molten steel on the crystallizer copper mold wrapped with the protection slag film along with the continuous insertion of the crystallizer copper mold;
4) When the crystallizer copper mold descends to a set position, stopping downward movement of the crystallizer copper mold, staying for 1-10 seconds, enabling the thickness of an initial solidified blank shell formed by solidifying molten steel on the surface of the crystallizer to reach 1-6mm, starting a blank pulling module to drive the solidified blank shell to move downward, enabling new molten steel to contact with the crystallizer copper mold, pulling out the initial solidified blank shell with a certain length, and keeping the permanent magnet stirring module to operate all the time; closing the copper mold vibration motor of the crystallizer in the process of pulling out the initial solidified blank shell;
5) The crystallizer copper mold drives the initial solidification blank shell to move upwards to separate from a molten pool in the crucible, and the initial solidification blank shell of the permanent magnet stirring square blank of the crystallizer is obtained after cutting; and finally, closing the permanent magnet stirring module of the crystallizer.
Further, the amplitude of the copper mould of the crystallizer is 1-6mm, and the vibration frequency is 50-350 times/min.
Further, the initial solidified shell length is 300-800mm.
The utility model has the beneficial effects that:
according to the device and the method, the positions of the permanent magnets are adjusted in advance, the magnetic field intensity and the magnetic field distribution condition of the crystallizer are adjusted, the rotating speed and the rotating direction of the permanent magnets can be controlled, diversified control of the magnetic field of the position of the crystallizer is realized, the research requirements of initial solidification shells under the condition of permanent magnet stirring of different types of steel and different types of the crystallizer are met through real simulation of permanent magnet stirring of the crystallizer, and the device and the method can be used for exploring the optimal condition of permanent magnet stirring of the crystallizer for different types of steel and provide sufficient reference for industrial application of permanent magnet stirring of the crystallizer. The conventional permanent magnet stirring device with fixed permanent magnet positions has single controllable parameters, is difficult to meet the stirring requirements of different melts, is difficult to explore the optimal permanent magnet stirring conditions, and is unfavorable for providing a proper and exact industrial application scheme. The device and the method of the patent application have the advantages of convenient experimental process, simple equipment operation, stable and reliable simulation process and lower experimental cost, provide real simulation for industrial field experiments of permanent magnet stirring of the crystallizer, avoid wasting excessive energy sources, and provide strong support for industrial application of the permanent magnet stirring of the crystallizer.
Drawings
The utility model is further described below with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of a preferred embodiment of an experimental apparatus for preparing a shell of an initial solidification of a permanent magnet stirring square billet of a crystallizer according to the present utility model.
In the figure: 1-a permanent magnet stirring module; 2-adjustable height support; 3-an outer pot body; 4-thermocouple; 5-a heating element; 6-protecting a slag layer by a crystallizer; 7-molten steel; 8-an inner pot body; 9-a blank pulling module; 10-a crystallizer; 11-control system.
Detailed Description
The present utility model will be described in further detail by way of examples. The features and advantages of the present utility model will become more apparent from the description. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model.
As shown in fig. 1, the experimental device for preparing the initial solidification shell of the permanent magnet stirring square billet of the crystallizer in the embodiment comprises a control system 11, a crucible for containing molten steel, a heating furnace for heating the crucible, a permanent magnet stirring module 1 for realizing permanent magnet stirring of molten steel in the crucible, a crystallizer 10 and a blank pulling module 9 matched with the crystallizer, wherein the crystallizer is matched with a copper mold of the crystallizer, and the control system is respectively electrically connected with the heating furnace, the permanent magnet stirring module and the blank pulling module.
The permanent magnet stirring module comprises a pair of permanent magnets, a permanent magnet rotating motor and an upper telescopic device, wherein the permanent magnets are driven to rotate by the permanent magnet rotating motor, the permanent magnets are arranged on the upper telescopic device and the lower telescopic device, the permanent magnet rotating motor can drive the permanent magnets to move at a set speed and in a set direction, and meanwhile, the upper telescopic device and the lower telescopic device can drive the permanent magnets to lift; the control system is respectively and electrically connected with the permanent magnet rotating motor and the upper and lower telescopic devices.
The blank pulling module comprises a blank pulling device and a blank pulling device moving device for driving the blank pulling device to move, the blank pulling device is matched with the crystallizer, and the blank pulling device moving device is electrically connected with the control system.
The heating furnace is matched with a heating body 5 and a thermocouple 4. In this embodiment, the heating furnace is an electric heating furnace, and the heating element is an electric heating body. The thermocouple is used for detecting temperature, preferably, the crucible comprises an outer pot body 3 and an inner pot body 8 which are sleeved and assembled, and the thermocouple is arranged between the outer pot body and the inner pot body so as to enable the thermocouple to be close to the molten liquid as much as possible, thereby improving the accuracy of temperature detection.
The crystallizer copper mold vibration motor is used for driving the crystallizer copper mold to vibrate and is electrically connected with the control system; the crystallizer copper mold vibrating motor can drive the crystallizer copper mold to vibrate.
The following details the method of using the above device:
example 1
An experimental method for preparing a square billet initial solidification shell by adopting the device comprises the following steps:
1) Placing 20kg of required experimental steel in a crucible, placing the crucible in a heating furnace, and adjusting the height of a permanent magnet module according to the experimental steel types and experimental requirements to realize the control of the magnetic field intensity at the crucible; the central magnetic field intensity is controlled at 1400Gs;
2) Starting a heating furnace to melt experimental steel, and keeping the temperature above 50 ℃ of liquidus temperature of the used steel grade; starting permanent magnet stirring, adjusting the stirring speed, and adjusting the stirring speed to 180rpm by the permanent magnet stirring to ensure that the components and the temperature of the molten steel 6 are uniform; then adding crystallizer protection slag matched with the steel grade into molten steel, forming a crystallizer protection slag layer after the crystallizer protection slag layer is completely melted, and measuring the temperature of the crystallizer protection slag layer;
3) Slowly inserting a crystallizer copper mold into a molten pool, starting a crystallizer copper mold vibration motor, driving the crystallizer copper mold to vibrate according to a set vibration frequency and a set vibration amplitude, rapidly cooling a crystallizer protection slag layer on the crystallizer copper mold to form a protection slag film, and rapidly solidifying molten steel on the crystallizer copper mold wrapped with the protection slag film along with the continuous insertion of the crystallizer copper mold; the amplitude of the copper mould of the crystallizer is 2mm, and the vibration frequency is 200 times/min;
4) When the crystallizer copper mold descends to a set position, the crystallizer copper mold stops moving downwards and stays for 5 seconds, the thickness of an initial solidified blank shell formed by solidifying molten steel on the surface of the crystallizer reaches 1-6mm, a blank pulling module is started to drive the solidified blank shell to move downwards, and meanwhile new molten steel contacts with the crystallizer copper mold to pull out the initial solidified blank shell with a certain length, and the permanent magnet stirring module is kept to operate all the time; closing the copper mold vibration motor of the crystallizer in the process of pulling out the initial solidified blank shell;
5) The crystallizer copper mold drives the initial solidification blank shell to move upwards to separate from a molten pool in the crucible, and the initial solidification blank shell of the permanent magnet stirring square billet of the crystallizer is obtained after cutting, wherein the length of the initial solidification blank shell is 500mm; and finally, closing the permanent magnet stirring module of the crystallizer.
Example 2
An experimental method for preparing a square billet initial solidification shell by adopting the device comprises the following steps:
1) Placing 22kg of experimental steel required in a crucible, placing the crucible in a heating furnace, and adjusting the height of a permanent magnet module according to the experimental steel types and experimental requirements to realize the control of the magnetic field intensity at the crucible; the central magnetic field intensity is controlled at 1400Gs;
2) Starting a heating furnace to melt experimental steel, and keeping the temperature above 30 ℃ of liquidus temperature of the used steel grade; starting permanent magnet stirring, adjusting the stirring speed, and adjusting the stirring speed to 180rpm by the permanent magnet stirring to ensure that the components and the temperature of the molten steel are uniform; then adding crystallizer protection slag matched with the steel grade into molten steel, forming a crystallizer protection slag layer after the crystallizer protection slag layer is completely melted, and measuring the temperature of the crystallizer protection slag layer;
3) Slowly inserting a crystallizer copper mold into a molten pool, starting a crystallizer copper mold vibration motor, driving the crystallizer copper mold to vibrate according to a set vibration frequency and a set vibration amplitude, rapidly cooling a crystallizer protection slag layer on the crystallizer copper mold to form a protection slag film, and rapidly solidifying molten steel on the crystallizer copper mold wrapped with the protection slag film along with the continuous insertion of the crystallizer copper mold; the amplitude of the copper mould of the crystallizer is 1mm, and the vibration frequency is 50 times/min;
4) When the crystallizer copper mold descends to a set position, the crystallizer copper mold stops moving downwards and stays for 1 second, the thickness of an initial solidified blank shell formed by solidifying molten steel on the surface of the crystallizer reaches 1-6mm, a blank pulling module is started to drive the solidified blank shell to move downwards, and meanwhile new molten steel contacts with the crystallizer copper mold to pull out the initial solidified blank shell with a certain length, and the permanent magnet stirring module is kept to operate all the time; closing the copper mold vibration motor of the crystallizer in the process of pulling out the initial solidified blank shell;
5) The crystallizer copper mold drives the initial solidification blank shell to move upwards to separate from a molten pool in the crucible, and the initial solidification blank shell of the permanent magnet stirring square billet of the crystallizer is obtained after cutting, wherein the length of the initial solidification blank shell is 300mm; and finally, closing the permanent magnet stirring module of the crystallizer.
Example 3
An experimental method for preparing a square billet initial solidification shell by adopting the device comprises the following steps:
1) Placing 25kg of steel for experiments in a crucible, placing the crucible in a heating furnace, and adjusting the height of a permanent magnet module according to the types of the steel for experiments and the experimental requirements to realize the control of the magnetic field intensity at the crucible; the central magnetic field intensity is controlled at 1400Gs;
2) Starting a heating furnace to melt experimental steel, and keeping the temperature above 70 ℃ of liquidus temperature of the used steel grade; starting permanent magnet stirring, adjusting the stirring speed, and adjusting the stirring speed to 180rpm by the permanent magnet stirring to ensure that the components and the temperature of the molten steel are uniform; then adding crystallizer protection slag matched with the steel grade into molten steel, forming a crystallizer protection slag layer after the crystallizer protection slag layer is completely melted, and measuring the temperature of the crystallizer protection slag layer;
3) Slowly inserting a crystallizer copper mold into a molten pool, starting a crystallizer copper mold vibration motor, driving the crystallizer copper mold to vibrate according to a set vibration frequency and a set vibration amplitude, rapidly cooling a crystallizer protection slag layer on the crystallizer copper mold to form a protection slag film, and rapidly solidifying molten steel on the crystallizer copper mold wrapped with the protection slag film along with the continuous insertion of the crystallizer copper mold; the amplitude of the copper mould of the crystallizer is 6mm, and the vibration frequency is 350 times/min;
4) When the crystallizer copper mold descends to a set position, the crystallizer copper mold stops moving downwards and stays for 10 seconds, the thickness of an initial solidified blank shell formed by solidifying molten steel on the surface of the crystallizer reaches 1-6mm, a blank pulling module is started to drive the solidified blank shell to move downwards, and meanwhile new molten steel contacts with the crystallizer copper mold to pull out the initial solidified blank shell with a certain length, and the permanent magnet stirring module is kept to operate all the time; closing the copper mold vibration motor of the crystallizer in the process of pulling out the initial solidified blank shell;
5) The crystallizer copper mold drives the initial solidification blank shell to move upwards to separate from a molten pool in the crucible, and the initial solidification blank shell of the permanent magnet stirring square billet of the crystallizer is obtained after cutting, wherein the length of the initial solidification blank shell is 800mm; and finally, closing the permanent magnet stirring module of the crystallizer.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model.
Claims (7)
1. An experimental device for preparing initial solidification blank shells of a permanent magnet stirring square blank of a crystallizer is characterized in that: the device comprises a control system, a crucible for containing molten steel, a heating furnace for heating the crucible, a permanent magnet stirring module for realizing permanent magnet stirring of molten steel in the crucible, a crystallizer and a blank pulling module matched with the crystallizer, wherein the crystallizer is matched with a copper mold of the crystallizer, and the control system is respectively electrically connected with the heating furnace, the permanent magnet stirring module and the blank pulling module.
2. The experimental device for preparing initial solidification blank shells of a permanent magnet stirring square blank of a crystallizer according to claim 1, wherein the experimental device is characterized in that: the heating furnace is matched with a heating body and a thermocouple.
3. The experimental device for preparing initial solidification blank shells of a permanent magnet stirring square blank of a crystallizer according to claim 2, wherein the experimental device is characterized in that: the crucible comprises an outer pot body and an inner pot body which are assembled in a sleeved mode, and the thermocouple is arranged between the outer pot body and the inner pot body.
4. The experimental device for preparing initial solidification blank shells of a permanent magnet stirring square blank of a crystallizer according to claim 3, wherein the experimental device comprises the following components: the crystallizer copper mold vibration motor is used for driving the crystallizer copper mold to vibrate and is electrically connected with the control system.
5. An experimental method for preparing a green initially solidified shell using the apparatus of claim 4, comprising the steps of:
1) Placing 20-25kg of required experimental steel in a crucible, placing the crucible in a heating furnace, and adjusting the height of a permanent magnet module according to the experimental steel types and experimental requirements to realize the control of the magnetic field intensity at the crucible;
2) Starting a heating furnace to melt experimental steel, and keeping the temperature above 30-70 ℃ of liquidus temperature of the used steel grade; starting permanent magnet stirring, adjusting stirring speed, and ensuring that the components and temperature of molten steel are uniform; then adding crystallizer protection slag matched with the steel grade into molten steel, forming a crystallizer protection slag layer after the crystallizer protection slag layer is completely melted, and measuring the temperature of the crystallizer protection slag layer;
3) Slowly inserting a crystallizer copper mold into a molten pool, starting a crystallizer copper mold vibration motor, driving the crystallizer copper mold to vibrate according to a set vibration frequency and a set vibration amplitude, rapidly cooling a crystallizer protection slag layer on the crystallizer copper mold to form a protection slag film, and rapidly solidifying molten steel on the crystallizer copper mold wrapped with the protection slag film along with the continuous insertion of the crystallizer copper mold;
4) When the crystallizer copper mold descends to a set position, stopping downward movement of the crystallizer copper mold, staying for 1-10 seconds, enabling the thickness of an initial solidified blank shell formed by solidifying molten steel on the surface of the crystallizer to reach 1-6mm, starting a blank pulling module to drive the solidified blank shell to move downward, enabling new molten steel to contact with the crystallizer copper mold, pulling out the initial solidified blank shell with a certain length, and keeping the permanent magnet stirring module to operate all the time; closing the copper mold vibration motor of the crystallizer in the process of pulling out the initial solidified blank shell;
5) The crystallizer copper mold drives the initial solidification blank shell to move upwards to separate from a molten pool in the crucible, and the initial solidification blank shell of the permanent magnet stirring square blank of the crystallizer is obtained after cutting; and finally, closing the permanent magnet stirring module of the crystallizer.
6. The method according to claim 5, wherein: the amplitude of the copper mould of the crystallizer is 1-6mm, and the vibration frequency is 50-350 times/min.
7. The method according to claim 6, wherein: the length of the initial solidified shell is 300-800mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310317136.4A CN116511439A (en) | 2023-03-29 | 2023-03-29 | Experimental device and method for preparing initial solidification shell of crystallizer permanent magnet stirring square billet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310317136.4A CN116511439A (en) | 2023-03-29 | 2023-03-29 | Experimental device and method for preparing initial solidification shell of crystallizer permanent magnet stirring square billet |
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| Publication Number | Publication Date |
|---|---|
| CN116511439A true CN116511439A (en) | 2023-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310317136.4A Pending CN116511439A (en) | 2023-03-29 | 2023-03-29 | Experimental device and method for preparing initial solidification shell of crystallizer permanent magnet stirring square billet |
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| Country | Link |
|---|---|
| CN (1) | CN116511439A (en) |
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2023
- 2023-03-29 CN CN202310317136.4A patent/CN116511439A/en active Pending
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