EP2222426B1 - Vorfahren zur steuerung oder regelung einer temperatur - Google Patents

Vorfahren zur steuerung oder regelung einer temperatur Download PDF

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Publication number
EP2222426B1
EP2222426B1 EP08857319.1A EP08857319A EP2222426B1 EP 2222426 B1 EP2222426 B1 EP 2222426B1 EP 08857319 A EP08857319 A EP 08857319A EP 2222426 B1 EP2222426 B1 EP 2222426B1
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EP
European Patent Office
Prior art keywords
strip
strand
temperature
target temperature
controlling
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
Application number
EP08857319.1A
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German (de)
English (en)
French (fr)
Other versions
EP2222426A1 (de
Inventor
Horst Gärtner
Heinz-Jürgen Oudehinken
Wolfgang Sauer
Thomas Heimann
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SMS Group GmbH
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SMS Group GmbH
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Publication of EP2222426A1 publication Critical patent/EP2222426A1/de
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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
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands

Definitions

  • the invention relates to a method for controlling or regulating the temperature of a casting strand in a continuous casting installation with a control or regulating unit for controlling or regulating the temperature of the casting strand in a secondary cooling of a continuous casting installation with at least one means for cooling the casting strand.
  • the strand of the casting material is cooled behind the mold until it solidifies completely in the so-called secondary cooling.
  • This cooling process plays a crucial role in the material quality of the strand.
  • the complete solidification should take place within the roll segments of the continuous caster, which support the strand with a liquid core.
  • the aim is that the cooling rates of the strand cooling and the temperature range for the strand shell are dimensioned so that the cast strand solidifies without errors.
  • cooling is carried out by spray water cooling, the spray water quantity being controlled by specifying spray water tables.
  • these spray water tables contain the amount of cooling water to be set for the spray water for each cooling zone. Certain amounts of water are therefore specified for different casting speeds.
  • the operator of the system selects a suitable table that is used to set the water quantities in the secondary cooling becomes. The handling of the many different tables for different operating conditions is complex and troublesome in everyday casting.
  • the target temperatures for regulating secondary cooling are automatically and dynamically adapted to the current conditions.
  • the complex handling of the numerous tables, which is still required in the prior art, is at least partially unnecessary for an operator.
  • the setpoint temperatures are usually preset so that normal operation of the system with the casting parameters to be expected (for example, casting temperature, casting speed) is possible.
  • the invention provides for the target temperatures to be dynamically adapted to the prevailing circumstances, that is to say any changed casting parameters.
  • the target temperatures are reset to their original values. This control / regulation of the target temperature takes place in a separate / separate first module within the entire control and regulation unit.
  • the data and / or signals which the control or regulating unit receives are, in particular, the temperature value of the casting strand at at least one position, the temperature value either being calculated or measured.
  • the temperatures of the casting strand can advantageously be measured in addition to the calculation in order to compare the temperature calculation with the measurement.
  • the control or regulating unit uses the received and determined data and / or signals to determine the state of the casting strand at at least one position and controls or regulates the temperature of the casting strand at at least one position in a second module, taking into account the adjusted target temperature and requirements of the casting process through suitable cooling.
  • the setpoint temperature of the casting strand is dynamically adjusted at at least one position as a function of the outlet temperature of the casting strand from the mold.
  • control or regulating unit uses the determined and / or received data or signals to determine the deflection of the strand and / or the strand shell between at least individual rollers. It is advantageous if the control or regulating unit uses the determined and / or received data or signals to determine an elongation of the strand and / or strand shell between at least individual rollers. It is also an advantage that the value of the determines deflection and / or elongation is compared with a comparison value and a warning is triggered if a limit value is exceeded.
  • the value of the determined deflection and / or elongation is compared with a comparison value and if a limit value is exceeded, the setpoint temperature of the strand is lowered at least in the region of the strand in which the excess is determined. Furthermore, it is expedient if the setpoint temperature or the setpoint temperatures is adjusted such that the deflection and / or the expansions does not exceed the permissible limit values for essentially the entire area of the secondary cooling.
  • the control or regulating unit uses the determined and / or received data and / or signals to determine a ductility of the strand. It is expedient if the determined ductility of the strand is compared with a predeterminable limit value of the ductility and a warning is triggered if the limit value is undershot. It is also expedient if the specific ductility of the strand is compared with a predeterminable limit value of the ductility and if the temperature falls below the limit value, the target temperature of the strand is raised. It is also advantageous if the ductility of the strand is preferably determined for an area in front of a bending and / or straightening unit of the continuous casting installation.
  • control or regulating unit determines a solidification length of the strand on the basis of determined and / or received data and / or signals, the specific solidification length of the strand being compared with a predefinable limit value and if the limit value is exceeded, an increase in the desired temperature of the strand is initiated. It is also advantageous if the control unit regulates the target temperature of the strand is selected in such a way that the limit values are essentially reached.
  • a parameter for the control can be, for example, the full utilization of the existing production capacity, such as using the available strand support in the continuous casting plant with regard to the solidification length essentially to the end.
  • the mathematical solidification length can therefore be taken into account when controlling or regulating the temperature or cooling.
  • Another advantageous parameter for controlling the cooling can be the achievement and compliance with at least individual quality parameters for the strand, some new steel types being sensitive to unfavorable cooling processes, so that the cooling rate is a control parameter in order to favorably influence the strip quality.
  • the strand temperature at the mold outlet also changes.
  • the subsequent cooling should take this into account, so that there are no quality problems, for example in the form of excessive thermal stresses, which could lead to cracks in some sensitive types of steel.
  • the strand of the continuous caster has the property of bulging out between the supporting roles. If the bulges are too large, high bending stresses and internal expansions may arise. This in turn could lead to strand damage.
  • the maximum permissible bulging is advantageously specified as a function of the casting parameters, such as, for example, the casting speed and / or the casting temperature.
  • the strand In the event that the strand is bent or straightened, it experiences additional strains and tensions. The strand material should then be able to withstand these additional expansions and tensions without substantial crack damage occurring. If the strand is brittle, it could crack the surface. In order to avoid such cracks as far as possible, it is advantageous if the strand is bent and straightened in a temperature range in which the strand is suitably ductile.
  • the invention relates to a control method or a regulating method, in particular for secondary cooling of a continuous caster.
  • Figure 1 schematically shows a continuous casting plant 1 with a mold 7 and a strand guide 8 and with a casting strand 2.
  • the control or regulation of the temperature is carried out automatically without the intervention of an operator or semi-automatically, in which case the control or regulating unit 3 determines the state of the continuous casting plant 1 analyzed on the basis of the available measurement data and making suggestions to the operator for setting various manipulated variables.
  • the continuous casting installation 1 also has means 4, 5 for data or signal acquisition, such as sensors.
  • temperature sensors 4 are arranged along the strand 2.
  • the means 4, 5 detect, that is to say detect or calculate, state variables of the strand or the continuous casting installation and pass this data on to the control or regulating unit 3, which dynamically determines the desired temperature or the desired temperatures of the strand 2 on the basis of the signals and / or data and on the basis of this controls the coolant 6 in order to achieve the desired temperature in the respective areas of the strand 2 the setpoint temperature is changed in such a way that the setpoint temperatures are dynamically adjusted as a function of the conditions of the cast strand.
  • a calculation of the temperature of the casting strand is advantageously carried out and the cooling or the amount of spray water is regulated in order to achieve the target temperature by regulation.
  • a catalog of the temperature target curves is also advantageously used. It is advantageous according to the invention that a monitoring module is fed by the temperature calculation, so that the bulging, the ductility and the distance from solidification to the end of the system are determined in this monitoring module. These specific values are compared with limit values and either a warning is issued and / or a dynamic adaptation of the target temperature or the target temperatures is carried out. This also applies to the Figure 6 referred.
  • the thermal stresses in the strand shell at the mold exit are reduced. Furthermore, it is advantageous if the control or regulation reduces or avoids operating states in which bulge of the strand between rollers becomes too large. It is also advantageous if the control or regulation prevents or reduces operating states in which the strand is bent or straightened in a temperature range in which the strand material is brittle. In addition, it is expedient if the open-loop or closed-loop control monitors the solidification length of the strand and preferably avoids or possibly reduces that the solidification length of the strand is longer than the distance to the end of the strand support, so that the strand already behind the end of the strand support is essentially frozen.
  • the control method according to the invention for controlling or regulating the temperature in the secondary cooling of the casting strand is based on a temperature regulation, at least one, but advantageously a plurality of target temperature distributions for the strand surface being stored as selectable default values in the memory of a control or regulating unit.
  • control or regulating unit 3 has a stored data record, such as a table in which a suitable target temperature distribution is assigned for each usable or editable material or for each usable or processable group of materials.
  • a control or regulating unit 3 controls the cooling water quantities of the secondary cooling on the basis of the stored and selected data in such a way that the strand temperatures at least substantially correspond to the target temperatures.
  • the open-loop or closed-loop control is optimized in such a way that the setpoint temperature distribution of the strand is not predefined for all operating states and is therefore predefined in a binding manner, but rather that the setpoint temperature distribution is dynamically adjusted according to predefinable criteria.
  • control or regulating unit advantageously contains further modules in order to perform additional tasks.
  • the Figure 2 shows a diagram 20 of a procedure according to the invention, according to which it is queried in block 21 what the temperature of the casting strand at the mold outlet or on the cooling segment following the mold is.
  • a query is made as to whether this determined temperature or a determined cooling rate is greater than a predefinable limit value or as the cooling rate prevailing between the mold and the cooling segment. If the answer to this query is yes, block 24 continues, in which a warning can be issued.
  • an increase or a reduction in the target temperature is activated and a reduced or increased cooling of the strand in the outlet area is activated, so that the temperature or the cooling rate of the strand is within the permissible limit values. If the answer to the query in block 22 is no, the set temperature is not changed in block 23. This process can be monitored and carried out virtually continuously, which is why this process step can be returned via the loop 26.
  • the setpoint temperatures of the line are then adapted to the determined outlet temperature for the first cooling segments. This creates a uniform cooling process for the strand while reducing thermal stresses.
  • the bulge of the strand can also be calculated, and the permissible bulge of the strand can also be determined.
  • the permissible bulging can depend, for example, on the current process parameters of the continuous caster.
  • the Figure 3 shows a diagram 30 of a procedure according to the invention, after which it is queried in block 31 how large the bulge of the strand between segment carriers.
  • a query is made as to whether this determined bulge is greater than a predefinable limit value, the limit value being able to be stored differently from area to area. If the answer to this question is yes, block 33 continues, in which a warning can be issued.
  • the control or regulating unit 3 preferably continuously or at intervals compares the detected or calculated bulging of the cast strand with the maximum permissible value during casting.
  • the target temperature is lowered.
  • the setpoint temperature is preferably lowered in the area of the casting strand where the excess is detected, it being also possible to control or undertake a reduction in the setpoint temperature in the section beforehand.
  • a further calculation module in the control or regulating unit 3 can determine the ductility of the strand. A comparison can be made between the determined value of the ductility with an allowable minimum value. If the ductility falls below this limit in a bending or straightening unit, the setpoint temperature is increased by the control or regulating unit, this preferably taking place in at least one cooling segment in front of the area of the bending or straightening unit.
  • Figure 4 referenced which shows a diagram 40 of a procedure according to the invention, after which it is queried in block 41 how great the ductility of the strand is preferably in a bending or straightening unit.
  • a query is made as to whether this determined ductility is less than a predeterminable limit value, the limit value possibly being stored differently from area to area. If this query is answered with yes, block 43 continues, in which a warning can be issued.
  • a reduction in the setpoint temperature of the strand is triggered and an increased cooling of the strand in the region of the reduced ductility is triggered, so that the temperature of the strand cools down at least there or at least in an area before it. If the query is answered with No in block 42, the set temperature is not changed, see block 45. This method can be monitored and carried out virtually continuously, which is why this method step can be returned via loop 46.
  • the control or regulating unit 3 can calculate or determine the solidification length of the strand 2 and monitor it using sensor signals. There the strand is supported by supporting segments, it is expedient if the solidification length is not longer than the maximum distance of the last supporting segment in the direction of transport. This advantageously has the effect that the strand is already solidified before it leaves the last supporting segment.
  • a solidification length for the strand according to a defined threshold lies before the last segment. The threshold value can be monitored by means of a sensor, so that if the solidification length is exceeded beyond this threshold value, the control or regulating unit 3 performs countermeasures. The expected solidification length is estimated on the basis of the current dynamic behavior.
  • the control or regulating unit causes the set temperature of the strand to be reduced at least in a region before the threshold solidification length, so that the solidification length of the strand is reduced overall. This causes a stronger strand cooling and the solidification length becomes shorter.
  • the threshold is advantageously chosen so that during the control or regulation process the solidification length does not or does not significantly exceed the threshold value and falls behind the supporting segments.
  • Figure 5 shows a diagram 50 of a procedure according to the invention, according to which it is queried or dynamically estimated in block 51 how long the solidification length of the strand is.
  • a query is made as to whether this determined solidification length is greater than a predefinable limit value.
  • block 53 continues, in which a warning can be issued.
  • a reduction in the setpoint temperature of the strand is controlled and an increased cooling of the strand is triggered, so that the temperature of the strand cools down at least in a preferred range and the strand length is reduced.
  • the target temperature is not changed, see block 55. This method can be monitored and carried out virtually continuously, which is why this method step can be returned via loop 56.
  • the Figure 6 schematically shows a casting installation 60, in which cooling segments 61 are provided for cooling the casting strand 62.
  • the temperature of the casting strand can be determined by means of the sensor 63 or a plurality of sensors in order to compare the casting strand temperature previously calculated with the measurement.
  • the temperature data of the sensor or sensors 63 are fed to data acquisition 64, which is also fed with further process data.
  • the data from the data acquisition 64 are fed to the monitoring unit 65 and the temperature calculation 66 and the target temperature table 67.
  • the monitoring unit 65 also receives data from the temperature calculation 66, which also forwards data to the control unit 68 for the cooling water quantity, the temperature calculation 66 also receiving data back from the control unit 68.
  • the monitoring unit 65 forwards data to the control unit 69 for the desired temperature, which in turn forwards data to the unit 68, which in turn controls the cooling segments 61. Bulging, ductility and removal of solidification from the end of the plant are determined in the monitoring unit 65. These are then compared with limit values, as described in the Figures 3 , 4 and 5 and the related description is described above. In the event of limit violations, there is either only a warning message or the target temperatures are changed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP08857319.1A 2007-12-03 2008-11-27 Vorfahren zur steuerung oder regelung einer temperatur Active EP2222426B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710058109 DE102007058109A1 (de) 2007-12-03 2007-12-03 Vorrichtung zur Steuerung oder Regelung einer Temperatur
PCT/EP2008/010076 WO2009071236A1 (de) 2007-12-03 2008-11-27 Vorrichtung zur steuerung oder regelung einer temperatur

Publications (2)

Publication Number Publication Date
EP2222426A1 EP2222426A1 (de) 2010-09-01
EP2222426B1 true EP2222426B1 (de) 2020-05-20

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EP08857319.1A Active EP2222426B1 (de) 2007-12-03 2008-11-27 Vorfahren zur steuerung oder regelung einer temperatur

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US (1) US9079243B2 (zh)
EP (1) EP2222426B1 (zh)
JP (1) JP2011502798A (zh)
KR (1) KR101246074B1 (zh)
CN (1) CN101883649B (zh)
BR (1) BRPI0820030B1 (zh)
CA (1) CA2706449C (zh)
DE (1) DE102007058109A1 (zh)
RU (1) RU2448803C2 (zh)
TW (1) TW200940211A (zh)
UA (1) UA97568C2 (zh)
WO (1) WO2009071236A1 (zh)
ZA (1) ZA201002233B (zh)

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CN101983799B (zh) * 2010-11-18 2014-04-30 马鞍山钢铁股份有限公司 异型坯连铸二冷区冷却装置
CN102416456B (zh) * 2011-12-14 2013-12-04 武汉钢铁(集团)公司 板坯连铸二次冷却控制系统与方法
CN104516464B (zh) * 2014-12-30 2018-10-12 公瑞燕 一种用于计算机系统的智能冷却系统
CN105195702A (zh) * 2015-09-30 2015-12-30 芜湖新兴铸管有限责任公司 一种连铸水冷调整工艺结构
CN108237226B (zh) * 2017-04-01 2020-06-30 浙江一火科技股份有限公司 一种用于粉末注射成形高外观要求零件的动态模具控温系统
CN107127314B (zh) * 2017-04-08 2019-02-12 湖南千盟工业智能系统股份有限公司 一种连铸二冷段铸流表面温度智能测量方法
TWI645922B (zh) * 2018-01-30 2019-01-01 中國鋼鐵股份有限公司 Method for reducing surface defects of cast embryo
DE102018215583A1 (de) 2018-09-13 2020-03-19 Sms Group Gmbh Verfahren zur Steuerung oder Regelung der Temperatur eines Gießstrangs in einer Stranggießanlage
TWI681831B (zh) * 2019-02-01 2020-01-11 中國鋼鐵股份有限公司 溫度監測系統及溫度監測方法
CN109865810B (zh) * 2019-03-22 2020-10-30 麦特勒智能科技(张家港)有限公司 一种冶金连铸冷却水的智能控制方法
CN113414363A (zh) * 2021-06-15 2021-09-21 阳春新钢铁有限责任公司 一种五流方坯铸机一元二次多维动态二冷配水控制系统
CN113996773B (zh) * 2021-10-27 2022-08-19 北京科技大学 一种动态多元化连铸冷却在线控制方法与系统
CN114130980B (zh) * 2021-10-29 2023-06-20 中冶南方连铸技术工程有限责任公司 连铸动态二冷控制方法

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Also Published As

Publication number Publication date
US20100324721A1 (en) 2010-12-23
JP2011502798A (ja) 2011-01-27
WO2009071236A1 (de) 2009-06-11
CN101883649B (zh) 2015-11-25
DE102007058109A1 (de) 2009-06-04
BRPI0820030B1 (pt) 2017-11-28
BRPI0820030A2 (pt) 2015-05-26
CN101883649A (zh) 2010-11-10
UA97568C2 (ru) 2012-02-27
RU2010127273A (ru) 2012-01-10
WO2009071236A8 (de) 2010-06-03
TW200940211A (en) 2009-10-01
CA2706449A1 (en) 2009-06-11
ZA201002233B (en) 2010-11-24
KR20100080907A (ko) 2010-07-13
RU2448803C2 (ru) 2012-04-27
BRPI0820030A8 (pt) 2016-05-03
KR101246074B1 (ko) 2013-03-21
CA2706449C (en) 2013-07-23
US9079243B2 (en) 2015-07-14
EP2222426A1 (de) 2010-09-01

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