CN109848385B - Device and method for continuous casting constant-temperature blank ejection based on electromagnetic induction heating - Google Patents
Device and method for continuous casting constant-temperature blank ejection based on electromagnetic induction heating Download PDFInfo
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Abstract
The invention discloses a device and a method for heating continuous casting constant-temperature blank ejection based on electromagnetic induction, which comprises a solenoid coil sleeved on a continuous casting blank and a power supply connected with the solenoid coilThe control cabinet is an infrared thermometer for collecting the head and tail temperatures of the cut continuous casting billet and a microcomputer system connected with the temperature of the infrared thermometer and the power supply control cabinet; the constant-temperature knockout method comprises the steps of recording the head and tail temperature T of the cut continuous casting billet by adopting an infrared thermometer1And T2Feeding back to the microcomputer system, starting the power control cabinet, and outputting the initial power P1To the end power P2Then the microcomputer system is spaced by a time interval TpRestarting the power control cabinet to perform the initial power P of the next period1To the end power P2And (6) outputting. The device has simple structure, and the method for constant-temperature knockout by adopting the device can reduce the temperature gradient in the length direction and the radial direction of the casting blank, reduce the thermal stress generated by uneven temperature distribution of the continuous casting blank before rolling and improve the uniformity of the structure.
Description
Technical Field
The invention belongs to the field of continuous casting, and particularly relates to a device and a method for continuous casting constant-temperature knockout based on electromagnetic induction heating.
Background
Continuous casting is a main mode of steel production, and more than 90% of steel in the world is produced by a continuous casting method at present. In order to further improve the production efficiency of steel products, a continuous casting blank hot-feeding direct rolling technology is researched and developed, namely, the corner part of the casting blank is heated by an induction heat supplementing method, so that the casting blank can meet the rolling requirement without passing through a heating furnace. Compared with the non-traditional method (the continuous casting slab is rolled after being heated in the heating furnace), the method has the advantages of saving energy, shortening the production period from continuous casting slab tapping to hot rolling and forming, and the like. However, most of the conventional induction reheating methods focus on reheating and soaking at the corners of a cast slab, and cannot solve the problem of uneven temperature distribution in the radial direction, particularly uneven temperature distribution in the longitudinal direction of the cast slab. The non-uniformity of the temperature distribution can cause the uneven distribution of the structure and generate thermal stress, and the quality of the rolled casting blank is influenced.
And the problem of uneven temperature distribution in the length direction and the radial direction of the continuous casting billet cannot be eliminated through process optimization. This results from the technological characteristics of the continuous casting technique: the front end of the continuous casting billet is exposed in the air for a longer time than the rear end, so that the cooling strength is greater than that of the rear end, and the different lengths of the front end and the rear end of the continuous casting billet exposed in the air determine that the temperature difference is formed in the length direction of the continuous casting billet; the heat of the continuous casting billet in the crystallizer and the secondary cooling zone is dissipated from the surface, so that the temperature difference is caused by the radial cooling process of the continuous casting billet. Although methods for improving the uneven temperature distribution of the continuous casting billet by adjusting the continuous casting process parameters, such as increasing the drawing speed, namely reducing the temperature difference between the length of the continuous casting billet and the radial direction by reducing the cooling time of the continuous casting billet, cannot fundamentally eliminate the temperature difference.
Disclosure of Invention
The purpose of the invention is as follows: the first purpose of the invention is to provide a device which can fundamentally eliminate the temperature difference of the continuous casting billet in the radial direction and the length direction and further realize the constant-temperature billet ejection of the continuous casting billet;
the second purpose of the invention is to provide a method for constant-temperature ejection by adopting the device.
The technical scheme is as follows: the invention relates to a device for heating continuous casting constant-temperature billet ejection based on electromagnetic induction, which comprises a solenoid coil sleeved on a continuous casting billet, a power supply control cabinet connected with the solenoid coil, an infrared thermometer for collecting the head and tail temperature of the cut continuous casting billet, and a microcomputer system for feeding back the temperature of the infrared thermometer and regulating and controlling the power supply control cabinet.
Furthermore, the solenoid coil is arranged between the roll shafts of the continuous casting machine and is positioned at the front end of the flame cutting machine.
The method for performing constant-temperature knockout by adopting the device comprises the following steps: recording the head and tail temperature T of the continuous casting billet after first cutting by adopting an infrared thermometer1And T2The microcomputer system starts the power supply control cabinet according to the head and tail temperature of the continuous casting billet to output the initial power P to the next continuous casting billet entering the solenoid coil1To the end power P2Then the microcomputer system is spaced by a time interval TpRestarting the power control cabinet to carry out the initial power P of the next casting blank1To the end power P2Outputting until all the continuous casting billets are discharged; wherein the starting power P1End power P2And interval time TpThe following formula is satisfied:
in the above formula, TpThe restart interval time of the power supply control cabinet (2), L the length m of the casting blank, v the casting speed m/s and P1The initial output power of the power supply control cabinet (2), η the thermal efficiency of the induction heating coil, ξ the heat absorption coefficient, the heat loss caused by the heat absorption and radiation of the casting blank, the heat dissipation of cooling water passing through the coil position and the heat transfer of the guide rail, and Q3Heat absorption capacity of head of casting blank L1Is the coil length m; c is the specific heat capacity J/(Kg.K) of the steel; rho is the density Kg/m of steel3(ii) a S is the cross-sectional area m of the casting blank2；T1And T2The surface temperature of the head and the tail end of the casting blank is controlled; p2Outputting power for the end of the power supply control cabinet (2); i' liquid2Is the end current of the solenoid coil; r is the resistance of a casting blank in a coil covering area; q1The total heat absorbed in the process of heating the casting blank; i' liquid1Is a screw threadInitial current of the line pipe coil; σ is the electrical conductivity of the steel.
Furthermore, the current I (t) in the solenoid coil of the present invention satisfies
Wherein, IpIs the current peak value, and f is the current frequency. Preferably, the current frequency f is 50-2500 Hz.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the device is simple in structure and easy and convenient to operate, and meanwhile, the method for constant-temperature knockout by adopting the device can fundamentally reduce the temperature gradient in the length direction and the radial direction of the casting blank, reduce the thermal stress generated by uneven temperature distribution of the continuous casting blank before rolling and improve the uniformity of the structure, thereby improving the quality of the rolled casting blank.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a schematic view of the solenoid coil of the present invention at the front end of the torch cutting machine;
FIG. 3 is a schematic view of the solenoid coil of the present invention located at the rear end of the torch cutting machine.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the device for heating continuous casting and constant-temperature billet ejection based on electromagnetic induction of the present invention comprises a solenoid coil 1 which is arranged between the rollers of a continuous casting machine and can be further sleeved on a continuous casting billet of a heating section, a power control cabinet 2 which is connected with the solenoid coil 1, an infrared thermometer 3 which collects the head and tail temperature of the continuous casting billet after first cutting, and a microcomputer system 4 which feeds back the temperature of the infrared thermometer 1 and regulates and controls the power control cabinet 2.
Wherein, solenoid coil 1 prefers to be water-cooling solenoid coil, can be located flame cutting machine 5 front end or rear end in a flexible way, as shown in fig. 2 and fig. 3, prefers to locate the front end, and solenoid coil 1 form is various, can select according to actual continuous casting billet shape, can be square solenoid coil, rectangle solenoid coil or circular solenoid coil, and solenoid coil 1 does not contact with the casting billet, consequently can not pollute the casting billet, belongs to clean heating, and the heating method is simple, can not have the loss on the consumptive material. The current output by the power control cabinet 2 can be in various forms, and alternating current or pulse current can be selected according to actual conditions. According to the invention, after the head and tail temperature of the continuous casting billet after the first cutting is acquired, the continuous casting billet which subsequently enters the solenoid coil 1 is heated according to the feedback of the head and tail temperature, so that the purpose of constant-temperature billet discharging is achieved. The device has high automation degree, and after the microcomputer system 4 inputs necessary parameters in advance, the microcomputer system 4 can calculate and control the power output from the power control cabinet 2 to the solenoid coil 1 according to the temperature data collected by the infrared thermometer 3.
The method for performing constant-temperature knockout by adopting the device comprises the following steps:
(1) selecting a solenoid coil 1 with an interface similar to that of the continuous casting billet according to the interface shape of the continuous casting billet, laying the solenoid coil 1, and introducing cooling water;
(2) in the microcomputer system 4, T is inputtedp、P1、P2Expressions, and other desired parameters besides temperature, including L1C, ρ, σ, S, L, v, etc.;
(3) starting the microcomputer system 4, the microcomputer system 4 records the head and tail temperature T of the continuous casting billet after the first cutting of the flame cutting machine 5 measured by the infrared thermometer 31And T2And calculate Tp、P1、P2；
(4) The microcomputer system 4 controls the power control cabinet 2 to control the start and output power P1And is linearly reduced to P2Heating the next continuous casting billet at intervals of TpThe microcomputer system 4 will restart the power control cabinet 2 to ensure that the power outputted in the next period is still P1Linear reduction to P2And further heating the next continuous casting billet.
Wherein, the linear finger
When t is 0, P is P1(ii) a When t is equal to 0, the first step is,
namely TpWhen P is equal to P2。
And the initial power P1End power P2And interval time TpSatisfies the following formula:
according to the invention, alternating current or pulse current is introduced into the solenoid coil 1 at the front end or the rear end of the flame cutting machine 5 by the power supply control cabinet 2, the alternating current magnetic field or the pulse magnetic field is excited in space by the current, the alternating current magnetic field or the pulse magnetic field generates induction current in the continuous casting billet, and the induction current generates joule heat in the continuous casting billet so as to heat the casting billet. During heating, the current introduced into the coil is expressed as
According to skin depth
The induced current in the casting blank is mainly concentrated on the surface and exponentially and radially attenuated. In order to improve the thermal efficiency of induction heating, the equivalent diameter and the skin depth of the casting blank meet the requirements
The current frequency determined by the method is usually 50-2500 Hz. (when D is>At 150mm, f is usually 50Hz, and D is<150mm, reference
The value is obtained. ) Wherein IpAnd mu and rho respectively represent a current peak value, a skin depth, the magnetic permeability and the resistivity of a casting blank, D represents the diameter of a round blank, a square blank represents the side length, and a plate blank represents the thickness.
When the current frequency is constant, the output power of the power control cabinet 2 changes from high to low along with the process of drawing, namely, the current peak value I in the solenoid coil 1pDecreases from high to low (I)1Is reduced to I2). After the flame cutting machine 5 is fed, the output power of the power supply control cabinet 2 is changed from high to low again, so that the heating effect of the solenoid coil 1 on the front end of the casting blank is greater than that of the rear end of the casting blank in the length direction of each continuous casting blank; due to the skin effect, an electromagnetic field is mainly concentrated on the surface layer of the continuous casting blank and is exponentially attenuated inside the casting blank, so that the heating effect of the solenoid coil 1 on the surface of the casting blank is larger than that of the solenoid coil inside the continuous casting blank in the radial direction of the continuous casting blank, the heating effect is combined with the process characteristic that the front end of the casting blank is lower in temperature than the rear end of the casting blank, and the surface temperature is lower than that of the solenoid coil inside the continuous casting blank, and finally the horizontal direction and the radial.
Example 1
The side length of the No. 45 steel square billet continuous casting is 150mm, the drawing speed is 1200mm/min, and the length of the casting blank cut by the cutting machine is 1200 mm.
According to the information, No. 45 steel
ρ＝7500Kg/m3，c＝450J/(Kg·K)
According to the conditions, a square water-cooling solenoid coil is selected, and the inner diameter of the coil is 170 mm. Since the billet diameter is 150mm, the frequency f of the current flowing in the induction heating coil is 50 Hz.
When the induction heating coil is 50mm long. Suppose that the temperature of the head and the tail of the continuous casting billet measured by the infrared thermometer is respectively T1＝900℃，T2＝1000℃。
According to P1、P2When ξ takes 1.2 and η takes 0.85, the above-mentioned parameters are inputted into microcomputer system, and the computer can calculate P according to the formula1＝208KW,P2＝32KW，Tp＝60s。
Namely (1) fixing the position of a water-cooling solenoid coil and introducing cooling water; (2) inputting the parameters into a microcomputer system, and calculating by the microcomputer system to obtain initial power P according to the input parameters and data acquired by the infrared temperature measuring instrument1At 208KW, end power P2Is 32 KW; (3) the microcomputer system controls the power control cabinet, and inputs the changed power to the water-cooling solenoid coil; (4) and restarting the power supply every 60s, so that the output power of the power supply control cabinet is reduced to 32KW from 208KW in the heating process of the next casting blank. Finally realizing the constant-temperature blank discharging of all continuous casting blanks.
Example 2
The thickness of the continuous casting section of a certain bearing steel plate blank is 100mm, the width is 400mm for continuous casting, the drawing speed is 800mm/min, and the length of a casting blank cut by a cutting machine is 1200 mm.
According to the data, the steel sigma is 7.34 × 105S/m，ρ＝7200Kg/m3，c＝540J/(Kg·K)。
According to the above conditions, the induction heating coil used was a rectangular coil having a coil cross-section of 120mm in length and 420mm in width. Since the thickness D of the slab is 100mm, according to
Therefore, the frequency range f of the current introduced into the induction heating coil is 86-190 Hz, and 100Hz is selected.
When the induction heating coil is 50mm long. Suppose that the temperature of the head and the tail of the continuous casting billet measured by the infrared thermometer is respectively T1＝900℃，T2＝1100℃。
According to P1、P2When ξ takes 1.2 and η takes 0.85, the above-mentioned parameters are inputted into microcomputer system, and the computer can calculate P according to the formula1＝562KW,P2＝66KW，Tp＝90s。
Namely (1) fixing the position of a water-cooling solenoid coil and introducing cooling water; (2) inputting the parameters into a microcomputer system, and calculating by the microcomputer system to obtain initial power P according to the input parameters and data acquired by the infrared temperature measuring instrument1562KW, end power P2Is 66 KW; (3) microcomputer system control power supplyA control cabinet for inputting the variable power to the water-cooling solenoid coil; (4) and restarting the power supply every 90s, so that the output power of the power supply control cabinet is reduced to 66KW from 562KW in the heating process of the next casting blank. Finally realizing the constant-temperature blank discharging of all continuous casting blanks.
Example 3
The continuous casting diameter of No. 45 steel round billet is 150mm, the drawing speed is 1200mm/min, and the length of the casting blank cut by the cutting machine is 1200 mm.
According to the information, No. 45 steel
ρ＝7500Kg/m3And c is 450J/(Kg. K). The diameter D of the round billet is 150mm, so that the frequency of the current introduced into the induction heating coil is 50 Hz.
When the induction heating coil is 50mm long. Suppose that the temperature of the head and the tail of the continuous casting billet measured by the infrared thermometer is respectively T1＝900℃，T2＝1000℃。
According to P1、P2When ξ takes 1.2 and η takes 0.85, the above-mentioned parameters are inputted into microcomputer system, and the computer can calculate P according to the formula1＝235KW,P2＝188KW，Tp＝60s。
Namely (1) fixing the position of a water-cooling solenoid coil and introducing cooling water; (2) inputting the parameters into a microcomputer system, and calculating by the microcomputer system to obtain initial power P according to the input parameters and data acquired by the infrared temperature measuring instrument1At 235KW, end power P2188 KW; (3) the microcomputer system controls the power control cabinet, and inputs the changed power to the water-cooling solenoid coil; (4) and restarting the power supply every 60s, so that the output power of the power supply control cabinet is reduced to 188KW from 235KW in the heating process of the next casting blank. Finally realizing the constant-temperature blank discharging of all continuous casting blanks.
Claims (4)
1. A continuous casting constant-temperature knockout method based on electromagnetic induction heating is characterized in that: the device related in the method comprises a solenoid coil (1) sleeved on the continuous casting billet, a power control cabinet (2) connected with the solenoid coil (1), an infrared thermometer (3) for collecting the head and tail temperature of the cut continuous casting billet, and a microcomputer system (4) for feeding back the temperature of the infrared thermometer (3) and regulating and controlling the power control cabinet (2);
the constant-temperature knockout method comprises the following steps: the head and tail temperature T of the continuous casting billet after the first cutting is recorded by adopting an infrared thermometer (3)1And T2The microcomputer system (4) starts the power supply control cabinet (2) according to the head and tail temperature of the continuous casting billet, and outputs initial power P to the continuous casting billet entering the solenoid coil (1) next time1To the end power P2Subsequently, the microcomputer system (4) is set at intervals TpRestarting the power control cabinet (2) to carry out the initial power P of the next casting blank1To the end power P2Outputting until all the continuous casting billets are discharged; wherein the starting power P1End power P2And interval time TpThe following formula is satisfied:
in the above formula, TpThe restart interval time of the power supply control cabinet (2), L the length m of the casting blank, v the casting speed m/s and P1The initial output power of the power supply control cabinet (2), η the thermal efficiency of the induction heating coil, ξ the heat absorption coefficient, which corresponds to the heat loss caused by the heat absorption and radiation of the casting blank, the heat dissipation of the cooling water passing through the coil position and the heat transfer of the guide rail, and Q3Heat absorption capacity of head of casting blank L1Is the coil length m; c is the specific heat capacity J/(Kg.K) of the steel; rho is the density Kg/m of steel3(ii) a S is the cross-sectional area m of the casting blank2；T1And T2The surface temperature of the head and the tail end of the casting blank is controlled; p2Outputting power for the end of the power supply control cabinet (2); i' liquid2Is the end current of the solenoid coil; r is the resistance of a casting blank in a coil covering area; q1The total heat absorbed in the process of heating the casting blank; i' liquid1Is the starting current of the solenoid coil; σ is the electrical conductivity of the steel.
2. The method of claim 1, wherein: the solenoid coil (1) is arranged between rollers of the continuous casting machine and is positioned at the front end or the rear end of the flame cutting machine (5).
3. The method of claim 1, wherein: the current I (t) in the solenoid coil (1) is
Wherein, IpIs the current peak value, and f is the current frequency.
4. The method of claim 1, wherein: the current frequency f is 50-2500 Hz.
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| FR2632220B1 (en) * | 1988-06-03 | 1992-08-21 | Grisset Ets | METHOD AND INSTALLATION FOR ONLINE HOMOGENEIZATION AND RECRYSTALLIZATION OF METAL PRODUCTS OBTAINED BY CONTINUOUS CASTING |
| DE3839773C2 (en) * | 1988-11-25 | 1995-12-21 | Schloemann Siemag Ag | Continuous caster with downstream rolling mill |
| US5844213A (en) * | 1990-01-31 | 1998-12-01 | Inductotherm Corp. | Induction heating coil assembly for prevention of circulating currents in induction heating lines for continuous-cast products |
| US5550353A (en) * | 1990-01-31 | 1996-08-27 | Inductotherm Corp. | Induction heating coil assembly for prevent of circulating current in induction heating lines for continuous-cast products |
| JPH0441048A (en) * | 1990-06-07 | 1992-02-12 | Sumitomo Metal Ind Ltd | Apparatus for continuously casting round cast billet |
| NL1007730C2 (en) * | 1997-12-08 | 1999-06-09 | Hoogovens Staal Bv | Apparatus and method for manufacturing a steel strip. |
| RU2134179C1 (en) * | 1998-06-10 | 1999-08-10 | Открытое акционерное общество Акционерная холдинговая компания "Всероссийский научно-исследовательский и проектно-конструкторский институт металлургического машиностроения имени академика Целикова" | Process of manufacture of merchant-mill products in combined casting and rolling aggregate and gear for its realization |
| JP2000264775A (en) * | 1999-03-23 | 2000-09-26 | Sumitomo Sitix Amagasaki:Kk | Electromagnetic induction casting apparatus |
| CN2839299Y (en) * | 2005-05-17 | 2006-11-22 | 上海大学 | Moving inductive heating equipment |
| UA94108C2 (en) * | 2006-06-26 | 2011-04-11 | Смс Зимаг Акциенгезелльшафт | Method for plant for producing of rolled stock as hot-rolled strip of silicon steel based on thin slabs |
| JP2012016723A (en) * | 2010-07-08 | 2012-01-26 | Jfe Steel Corp | Method and device for repairing surface of continuously cast slab |
| DE102011000089A1 (en) * | 2011-01-11 | 2012-07-12 | Thyssenkrupp Steel Europe Ag | Method for producing a hot rolled flat steel product |
| CN202498077U (en) * | 2012-03-13 | 2012-10-24 | 广德因达电炉成套设备有限公司 | Continuous casting and rolling online induction heating apparatus |
| JP5803838B2 (en) * | 2012-07-31 | 2015-11-04 | 新日鐵住金株式会社 | Method for estimating slab temperature |
| JP6439938B2 (en) * | 2016-01-13 | 2018-12-19 | Ｊｆｅスチール株式会社 | Heating method after cutting continuous cast slab |
| JP6562223B2 (en) * | 2017-01-18 | 2019-08-21 | Ｊｆｅスチール株式会社 | Heating method and heating equipment for continuous casting slab |
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