EP0036342A1 - Verfahren zur Kontrolle der Strangkühlung beim Stranggiessen - Google Patents

Verfahren zur Kontrolle der Strangkühlung beim Stranggiessen Download PDF

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Publication number
EP0036342A1
EP0036342A1 EP81400212A EP81400212A EP0036342A1 EP 0036342 A1 EP0036342 A1 EP 0036342A1 EP 81400212 A EP81400212 A EP 81400212A EP 81400212 A EP81400212 A EP 81400212A EP 0036342 A1 EP0036342 A1 EP 0036342A1
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EP
European Patent Office
Prior art keywords
curve
water flow
function
product
speed
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.)
Granted
Application number
EP81400212A
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English (en)
French (fr)
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EP0036342B1 (de
Inventor
Alain Chielens
Philippe Benoit
Bernard Roggo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fives Cail Babcock SA
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Fives Cail Babcock SA
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Publication date
Application filed by Fives Cail Babcock SA filed Critical Fives Cail Babcock SA
Publication of EP0036342A1 publication Critical patent/EP0036342A1/de
Application granted granted Critical
Publication of EP0036342B1 publication Critical patent/EP0036342B1/de
Expired legal-status Critical Current

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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

Definitions

  • the molten metal begins to solidify in the ingot mold, where a relatively thin skin is formed, then solidification continues in the secondary cooling zone equipped with nozzles or spraying booms or water atomization.
  • this secondary cooling by nozzles or ramps is to ensure regular growth of the skin formed in the mold to achieve complete solidification of the product cast in the form of a bar after a predetermined time. Sufficient water flows must be projected onto the bar to maintain the temperature of the skin of the cast product at a value low enough for it to have adequate mechanical strength. On the other hand, if too large water flow rates are used, the temperature of the product poured into the straightening zone of the bar from the curved state to the straight state will be too low; there will follow a decrease in the ductility of the surface of the cast metal such that the deformations due to the straightening of the bar will be greater than the limit deformations acceptable by the metal in this zone. In general, uncontrolled cooling of the cast product can be the cause of significant metallurgical defects, in particular of internal and surface cracks.
  • the total water flow used in the cooling zone or the partial flows of one or more sections of this zone are periodically adjusted according to the age of the fictitious slices of poured product formed during time intervals equal to the setting period, located in the corresponding cooling zone or section. For this, one or more variation curves of water flow rates as a function of the age of the product are used which are pre-established from test results and calculations.
  • the present invention provides a method and a system for taking into account the actual behavior and the thermal history of the cast product.
  • the process which is the subject of the invention is characterized in that the set values of the cooling water flow rates of the various sections of the secondary cooling zone are periodically determined by means of a computer from a first curve representing the variations, as a function of the residence time in the casting machine, of the quantity of heat extracted from a unit mass of the cast product, during its journey from the free surface of the metal in the ingot mold to the zoned solidification or beyond, and a second curve associated with the previous one due to the laws of thermal behavior and representing the variations, as a function of the residence time in the casting machine, of the surface temperature of the cast product.
  • These curves were defined beforehand using a mathematical model for simulating the thermal behavior of the cast product calibrated by experimental results.
  • the equations from which the curves of the quantity of heat extracted and the surface temperature are established include parameters whose value can vary from one casting to another: nature of the metal cast, format of the product cast. It is therefore necessary to have a set of curves for each steel grade and each format that is planned to be cast.
  • the quantity of heat extracted in an ingot mold is determined, the curve of the quantity of heat extracted is corrected by shifting it parallel to the time axis so that it passes through the point whose coordinates are, on the one hand, the residence time of the product poured into the mold and, on the other hand, the quantity of heat extracted in the mold, and the set values of the water flow rates are calculated from the corrected curve.
  • this curve is corrected by connecting by a straight line or a 2nd or 3rd degree curve the point whose the coordinates are, on the one hand, the residence time in the mold and, on the other hand, the surface temperature of the product at the outlet of the mold at a point on the curve corresponding to an upper section of the cooling zone smoothing, and the set values of the water flow rates are calculated from the corrected curve.
  • the surface temperature of the product poured at the outlet of the ingot mold is measured by means of an optical pyrometer or calculated from the amount of heat extracted in the ingot mold by means of a curve established using forecast simulation calculations.
  • the surface temperature profile which is imposed in the secondary cooling zone makes it possible to reach the desired temperature at the exit from the zone, in particular at the straightening point of the bar in a curved casting installation.
  • the efficiency of the cooling device may vary accidentally, for example by fouling or wear of the nozzles.
  • the surface temperature of the bar measured just at the outlet of the cooling zone or in the vicinity of the straightening point in the case of a curved machine is periodically compared with the desired temperature and, if the difference between these two values is greater than a predetermined value, the reference values of the water flow rates of the last sections of the secondary cooling zone are corrected.
  • the reference value of the water flow rate of the last section is corrected; the importance of this correction is a function of the temperature difference. If at the end of a predetermined time this difference is still too great, it is possible to correct the set value of the water flow rates of one or more previous sections.
  • a family of curves of quantity of heat extracted and of surface temperature are used which correspond to different extraction speeds of the cast product.
  • several classes of extraction speed are defined and a set of curves of the quantity of heat extracted and of the surface temperature are associated with each class.
  • the set values of the water flow rates are calculated from the set of curves corresponding to the class into which this speed enters.
  • the set values for the water flow rates for the duration of the transient regime are calculated from the curves corresponding to the initial speed.
  • the extraction speed takes a new value and keeps it for a period of time whose duration is greater than a predetermined value (approximately 5 minutes)
  • a predetermined value approximately 5 minutes
  • the average extraction speed of a slice is defined as the quotient of the distance traveled by this slice in the machine by the age of this slice.
  • This division of the product cast into fictitious elementary slices is moreover generally used in the method of the invention, in the same way as in certain known methods, to determine at a given instant the age of the different slices, information from which the quantities of heat to be extracted, the surface temperatures, the exchange coefficients, the specific water flows and the set values for the water flows of the different sections of the cooling zone are calculated.
  • the machine for the continuous casting of steel shown diagrammatically in FIG. 1 essentially comprises an ingot mold 10, a corset of guide rollers 12, straightening rollers 14 and a cooling device comprising nozzles or spray or atomization grouped by sections, all the nozzles or booms of the same section being connected in parallel to a supply pipe provided with a valve 16 whose opening is controlled by a regulator 18 to maintain the supply flow equal at a set flow rate set by a computer 20.
  • the nozzles or booms are distributed all around the casting bar or, in the case of a bar with rectangular section, only on its large faces. Means are provided for manually adjusting the distribution between the different nozzles or booms of a section, according to their position, of the total flow of water supplying this section.
  • thermometric rod 22 for measuring the temperature of the molten metal in the distributor 24
  • thermometric probes 26 for measuring the temperature of the water of cooling of the ingot mold, at its inlet and outlet
  • flow meter 28 for measuring the flow rate of the cooling water of the ingot mold
  • pulse generator 30 for measuring the extraction speed of the bar and the calculation of the age of the elements of the bar
  • pyro meter 32 for measuring the surface temperature of the bar in the vicinity of the straightening point, etc.
  • the latter determines at regular intervals the set values of the water supply flow rates of the various sections of the cooling device.
  • This regular time interval is for example between 1 and 50 seconds.
  • the principle of cooling control according to the invention is to maintain over time the evolution of the solidification of the bar regardless of the operating regime of the casting machine.
  • a law of variation of the quantity of heat C extracted per kilo of steel is imposed as a function of the residence time in the machine t (FIG. 3) with which is associated a law of variation of the surface temperature T of the bar as a function of the residence time in the machine t (FIG. 2).
  • These laws essentially depend on the grade of steel, the size of the bar and the speed of extraction.
  • steel grades and extraction speeds will be grouped into different classes.
  • the number of classes will depend on the order book of the steelworks.
  • the set values of the supply water flow rates of the different sections of the cooling zone are calculated by integration. Cool and the calculated values are transmitted to the respective controllers 18.
  • the total water flow rate of the cooling zone is calculated and deduced therefrom the total air flow to be used, using an equation or a curve establishing a relationship between these two flows.
  • Means are provided for manually adjusting the distribution between the different sections of the total air flow supplying the secondary cooling zone.
  • the computer 20 determines, on the basis of the values of the flow rate and of the temperatures at the inlet and at the outlet of the cooling water of the ingot mold, measured continuously by the probes 26 and the flow meter 28, or from a file of values established using forecast simulation calculations, the quantity of heat extracted in the mold and deduces the time lag which must be taken into account for the determination of the quantities of heat to be extracted in the secondary cooling zone.
  • the measurement of the surface temperature of the bar in the vicinity of the straightening point is continuously transmitted to the computer 20 by the pyrometer 32. If its value deviates too much from the desired value (for example if the difference is greater than 50 ° C), the computer modifies the setpoint values calculated for the last section (s) of the secondary cooling zone accordingly. Calcu The reader first corrects the setpoint for the water flow from the last cooling section; the extent of the correction depends on the difference between the measured temperature and the desired temperature. Then after a certain time, which depends on the position of the last cooling section relative to the rectification point, the computer corrects the set values for the water flow rates of the last two cooling sections if the difference between the temperatures is still too important.
  • the computer maintains or not, depending on the temperature difference, the correction of the setpoints of the water flow rates of the two last sections.
  • this could gradually correct the water flow setpoints for the last three or four sections of the cooling zone.
  • the set values of the feed water flow rates of each section of the cooling zone are calculated by integrating the water flow rates calculated for each elementary unit located in the section considered. As this average speed varies gradually to finally become equal to the new speed, if it is stable, the set values of the water flows for each section of the cooling zone will gradually change from the values they had at the initial speed up to the values corresponding to the new speed.
  • the computer can supply other information: proposal of an optimal extraction speed in steady state which depends on the nature of the metal, the format of the product and the temperature of the metal in the distributor, alarms if the temperature of the steel in the distributor exceeds the limits imposed, if the calculated water flows are greater than predetermined maximum values, if the difference between the measured and calculated water flows is greater than 10%, if the actual extraction speed is greater than the optimal speed, if the surface temperature at the righting point is too low, etc.
  • the computer can also be advantageously used to check the condition of the cooling device secondary between two flows. For this, the different sections of the cooling device will be supplied; after setting flow rate setpoints using the calculator, the actual flow rates and actual pressures will be measured and the measured values compared to the calculated values. If the device is in good condition (no wear, no fouling, no leakage), there should be no significant differences between these values; in particular for a given flow rate, the pressure measured must comply with the pressure calculated.
  • the calculated pressures are determined by the computer using the pressure-flow curves which are stored in the computer memory and which are pre-established on the basis of test and calculation results.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP81400212A 1980-03-13 1981-02-11 Verfahren zur Kontrolle der Strangkühlung beim Stranggiessen Expired EP0036342B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8005592A FR2477925A1 (fr) 1980-03-13 1980-03-13 Procede de controle du refroidissement du produit coule dans une installation de coulee continue
FR8005592 1980-03-13

Publications (2)

Publication Number Publication Date
EP0036342A1 true EP0036342A1 (de) 1981-09-23
EP0036342B1 EP0036342B1 (de) 1984-02-15

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ID=9239620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400212A Expired EP0036342B1 (de) 1980-03-13 1981-02-11 Verfahren zur Kontrolle der Strangkühlung beim Stranggiessen

Country Status (6)

Country Link
US (1) US4463795A (de)
EP (1) EP0036342B1 (de)
JP (1) JPS56151156A (de)
AT (1) ATE6216T1 (de)
DE (1) DE3162190D1 (de)
FR (1) FR2477925A1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2540016A1 (fr) * 1983-01-28 1984-08-03 Siderurgie Fse Inst Rech Procede de reglage du refroidissement secondaire d'une machine de coulee continue
EP0076743B1 (de) * 1981-10-02 1985-08-14 FIVES-CAIL BABCOCK, Société anonyme Kühlungsverfahren für das gegossene Produkt in einer Stranggiessanlage
US4588020A (en) * 1983-01-11 1986-05-13 Voest-Alpine International Corporation Surveillance system for curved continuous casting plants
FR2643580A1 (fr) * 1989-02-27 1990-08-31 Siderurgie Fse Inst Rech Procede de reglage du refroidissement secondaire d'une machine de coulee continue de produits metalliques
DE4210495C1 (de) * 1992-03-31 1993-04-15 Ibvt Ingenieurbuero Fuer Verfahrenstechnik Gmbh, 4000 Duesseldorf, De
EP0650790A1 (de) * 1993-10-29 1995-05-03 DANIELI & C. OFFICINE MECCANICHE S.p.A. Verfahren und Vorrichtung zur thermischen Oberflächenbehandlung eines Stranges
US5553094A (en) * 1990-02-15 1996-09-03 Iris Systems, Inc. Radio communication network for remote data generating stations
US5953368A (en) * 1988-11-02 1999-09-14 Axonn Corporation Wireless alarm system
WO2009090000A1 (de) * 2008-01-18 2009-07-23 Sms Siemag Ag Verfahren zur regelung der sekundärkühlung von stranggiessanlagen

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6171162A (ja) * 1984-09-17 1986-04-12 Sumitomo Heavy Ind Ltd 連続鋳造機における鋳片の表面温度制御方法
JPS6174763A (ja) * 1984-09-17 1986-04-17 Sumitomo Heavy Ind Ltd 連続鋳造機における鋳片の表面温度制御方法
JPS6171161A (ja) * 1984-09-17 1986-04-12 Sumitomo Heavy Ind Ltd 連続鋳造機における鋳片の表面温度制御方法
AT403351B (de) * 1993-05-19 1998-01-26 Voest Alpine Ind Anlagen Verfahren zum stranggiessen eines metallstranges
US6264767B1 (en) 1995-06-07 2001-07-24 Ipsco Enterprises Inc. Method of producing martensite-or bainite-rich steel using steckel mill and controlled cooling
DE19612420C2 (de) * 1996-03-28 2000-06-29 Siemens Ag Verfahren und Einrichtung zur Steuerung der Kühlung eines Stranges in einer Stranggießanlage
US6056041A (en) * 1997-06-12 2000-05-02 Alcan International Limited Method and apparatus for controlling the temperature of an ingot during casting, particularly at start up
AU4596899A (en) 1998-07-10 2000-02-01 Ipsco Inc. Method and apparatus for producing martensite- or bainite-rich steel using steckel mill and controlled cooling
US6432160B1 (en) 2000-06-01 2002-08-13 Aemp Corporation Method and apparatus for making a thixotropic metal slurry
US6399017B1 (en) * 2000-06-01 2002-06-04 Aemp Corporation Method and apparatus for containing and ejecting a thixotropic metal slurry
US6796362B2 (en) * 2000-06-01 2004-09-28 Brunswick Corporation Apparatus for producing a metallic slurry material for use in semi-solid forming of shaped parts
US7024342B1 (en) 2000-07-01 2006-04-04 Mercury Marine Thermal flow simulation for casting/molding processes
US20090084517A1 (en) * 2007-05-07 2009-04-02 Thomas Brian G Cooling control system for continuous casting of metal
DE102007058109A1 (de) * 2007-12-03 2009-06-04 Sms Demag Ag Vorrichtung zur Steuerung oder Regelung einer Temperatur
CN102632213A (zh) * 2011-02-12 2012-08-15 沈阳鑫君城电子有限公司 铸坯表面温度测量和控制方法及其专用装置
CN108031806A (zh) * 2017-10-17 2018-05-15 襄阳远锐资源工程技术有限公司 一种铅锭浇铸装置及浇铸方法
JP6703201B1 (ja) * 2019-05-28 2020-06-03 堺ディスプレイプロダクト株式会社 有機ｅｌデバイスの製造方法
CN110570760B (zh) 2019-08-13 2022-01-04 武汉华星光电半导体显示技术有限公司 一种可折叠柔性显示装置
CN113102714B (zh) * 2020-07-30 2021-12-03 北京科技大学 一种控制包晶钢板坯角部裂纹的连铸冷却方法
CN112958751A (zh) * 2021-01-27 2021-06-15 唐山不锈钢有限责任公司 一种连铸二次冷却状态的在线预测和管理方法

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FR2027433A1 (de) * 1968-12-31 1970-09-25 Uss Eng & Consult

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US3478808A (en) * 1964-10-08 1969-11-18 Bunker Ramo Method of continuously casting steel
BE759738A (fr) * 1969-12-03 1971-05-17 Schloemann Ag Procede pour refroidir de la matiere en barre sortant d'une lingotiere a bouts ouverts et dispositif pour l'execution de ce procede
CH552424A (de) * 1972-09-06 1974-08-15 Concast Ag Verfahren zum steuern der kuehlung eines aus einer durchlaufkokille austretenden stranges und vorrichtung zur durchfuehrung dieses verfahrens.
DE2444794A1 (de) * 1974-09-19 1976-04-01 Demag Ag Verfahren zum kuehlen des in einer stahlstranggiessanlage erzeugten stranges
US4073332A (en) * 1974-09-26 1978-02-14 Centre De Recherches Metallurgiques Centrum Voor Research In De Metallurgie Method of controlling continuous casting of a metal
GB1518319A (en) * 1974-09-26 1978-07-19 Metallurg Ct Centre Rech Method of controlling continuous casting of a metal
JPS5246330A (en) * 1975-10-11 1977-04-13 Nippon Steel Corp Method of controlling volume of coolin water of secondary cooling zone in continuous casting
DE2651573C2 (de) * 1976-11-12 1983-04-28 Werner Dipl.-Ing. 4320 Hattingen Wilhelm Verfahren und Vorrichtung zum Steuern einer Sekundärkühlung eines aus einer Stranggießkokille austretenden Stahlstrangs

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2027433A1 (de) * 1968-12-31 1970-09-25 Uss Eng & Consult

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0076743B1 (de) * 1981-10-02 1985-08-14 FIVES-CAIL BABCOCK, Société anonyme Kühlungsverfahren für das gegossene Produkt in einer Stranggiessanlage
US4588020A (en) * 1983-01-11 1986-05-13 Voest-Alpine International Corporation Surveillance system for curved continuous casting plants
FR2540016A1 (fr) * 1983-01-28 1984-08-03 Siderurgie Fse Inst Rech Procede de reglage du refroidissement secondaire d'une machine de coulee continue
EP0116496A1 (de) * 1983-01-28 1984-08-22 Institut De Recherches De La Siderurgie Francaise (Irsid) Verfahren zur Regelung der Sekundärkühlung einer Stranggiessmaschine
US4562880A (en) * 1983-01-28 1986-01-07 Institut De Recherches De La Siderurgie Francaise Process for adjusting the secondary-cooling rate of a continuous-casting machine
USRE40111E1 (en) * 1988-11-02 2008-02-26 M & Fc Holding, Llc Wireless alarm system
US5987058A (en) * 1988-11-02 1999-11-16 Axonn Corporation Wireless alarm system
US5953368A (en) * 1988-11-02 1999-09-14 Axonn Corporation Wireless alarm system
FR2643580A1 (fr) * 1989-02-27 1990-08-31 Siderurgie Fse Inst Rech Procede de reglage du refroidissement secondaire d'une machine de coulee continue de produits metalliques
EP0385904A1 (de) * 1989-02-27 1990-09-05 Institut De Recherches De La Siderurgie Francaise (Irsid) Verfahren zur Regelung der Sekundärkühlung einer Stranggiessmaschine für metallische Produkte
US5553094A (en) * 1990-02-15 1996-09-03 Iris Systems, Inc. Radio communication network for remote data generating stations
US6172616B1 (en) 1990-02-15 2001-01-09 Itron, Inc. Wide area communications network for remote data generating stations
US6373399B1 (en) 1990-02-15 2002-04-16 Itron, Inc. Wide area communications network for remote data generating stations
US6653945B2 (en) 1990-02-15 2003-11-25 Itron, Inc. Radio communication network for collecting data from utility meters
US5454417A (en) * 1992-03-31 1995-10-03 IBVT Ingenieurburo f. Verfahrenstechnik GmbH Method for casting steels in arcuate continuous casting installations
DE4210495C1 (de) * 1992-03-31 1993-04-15 Ibvt Ingenieurbuero Fuer Verfahrenstechnik Gmbh, 4000 Duesseldorf, De
US5634512A (en) * 1993-10-29 1997-06-03 Danieli & C. Officine Meccaniche Spa Method and apparatus for casting and thermal surface treatment
EP0650790A1 (de) * 1993-10-29 1995-05-03 DANIELI & C. OFFICINE MECCANICHE S.p.A. Verfahren und Vorrichtung zur thermischen Oberflächenbehandlung eines Stranges
CN1052435C (zh) * 1993-10-29 2000-05-17 丹尼利机械厂联合股票公司 连铸机中表面热处理的方法及装置
WO2009090000A1 (de) * 2008-01-18 2009-07-23 Sms Siemag Ag Verfahren zur regelung der sekundärkühlung von stranggiessanlagen
DE102008004911B4 (de) * 2008-01-18 2025-02-13 Sms Group Gmbh Verfahren zur Regelung der Sekundärkühlung von Stranggießanlagen

Also Published As

Publication number Publication date
EP0036342B1 (de) 1984-02-15
FR2477925A1 (fr) 1981-09-18
JPS56151156A (en) 1981-11-24
US4463795A (en) 1984-08-07
DE3162190D1 (en) 1984-03-22
ATE6216T1 (de) 1984-03-15
FR2477925B1 (de) 1983-12-16
JPS6345905B2 (de) 1988-09-12

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