EP0047218B1 - Kontroll- und Regelverfahren beim kontinuierlichen Giessen von Bändern - Google Patents

Kontroll- und Regelverfahren beim kontinuierlichen Giessen von Bändern Download PDF

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Publication number
EP0047218B1
EP0047218B1 EP81420130A EP81420130A EP0047218B1 EP 0047218 B1 EP0047218 B1 EP 0047218B1 EP 81420130 A EP81420130 A EP 81420130A EP 81420130 A EP81420130 A EP 81420130A EP 0047218 B1 EP0047218 B1 EP 0047218B1
Authority
EP
European Patent Office
Prior art keywords
speed
deviation
casting
strip
value
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.)
Expired
Application number
EP81420130A
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English (en)
French (fr)
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EP0047218A2 (de
EP0047218A3 (en
Inventor
Serge Bercovici
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.)
Societe de Conditionnement en Aluminium SCAL GP SA
Original Assignee
Societe de Conditionnement en Aluminium SCAL GP SA
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Societe de Conditionnement en Aluminium SCAL GP SA filed Critical Societe de Conditionnement en Aluminium SCAL GP SA
Priority to AT81420130T priority Critical patent/ATE6217T1/de
Publication of EP0047218A2 publication Critical patent/EP0047218A2/de
Publication of EP0047218A3 publication Critical patent/EP0047218A3/fr
Application granted granted Critical
Publication of EP0047218B1 publication Critical patent/EP0047218B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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

Definitions

  • the subject of the present invention is a process for controlling and regulating the operating parameters of a machine for casting strips between rolls, intended to optimize the conditions for obtaining a good quality product and, in particular, to increase the productivity.
  • the metal distributed by the nozzle fills the free space between the cylinders along a circular arc comprised between the plane of the outlet section of the nozzle and the outlet plane of the cylinders.
  • the metal cools, begins to solidify in a place called swamp, due to the presence of a more or less viscous mixture of crystals and liquid, located at a distance from the plane of the section outlet point of the nozzle generally called marsh depth. Then the metal solidifies completely and is drawn towards the exit plane of the cylinders in an increasingly restricted space, where it undergoes a rolling force which gradually brings it to the desired thickness when it escapes by the space between cylinders in the form of a strip which is then taken up by a reel.
  • This strip is subsequently subjected to various mechanical and / or thermal treatments which lead to products such as thin sheet for example, the mechanical characteristics of which: resistance, elastic limit, elongation, hardness, etc. will be partly depending on the quality of the strip from the casting machine.
  • Good quality presupposes the absence of faults such as cracks, cracks or sagging of metal at the outlet of the cylinders.
  • several causes of the appearance of defects are known on the strips produced from the casting machines concerned here. These are, in general, variations of certain operating factors such as the temperature of the metal supplying the machine, the flow of cooling water from the cylinders, the surface condition of the cylinders linked to the lubrication conditions, the composition of the metal. poured, the level of the metal in the chute, etc ...
  • the values of the running variable and the speed are predetermined as a function of the strip to be laminated and that for a given strip, the maximum speed of the rolling mill is fixed in advance and cannot therefore be exceeded as well as the also shows Figure 4.
  • the applicant has designed a control and regulation process in which the values of the speed and of the walking variables are not predetermined but where only a fixed deviation value to be respected and this reference deviation are fixed only for the walking variables is maintained by varying the speed.
  • This difference corresponds to the difference between an average of values of the walking variable during a previous moment and the instantaneous value so that the values of the walking variables change over time without ever being dependent on a predetermined limit value; Since the walking variables are constantly changing, the speed will change in the same way without ever being limited by a predetermined value, and will therefore lead to maximum productivity.
  • This process in which we consider at least one of the parameters belonging to the group consisting of the torque exerted on at least one of the cylinders to advance the strip, the force exerted by the strip on at least one of the pins , the temperature of the strip at the outlet of the cylinders, is characterized in that the difference between the instantaneous value of the parameter considered and the average value of this same parameter is continuously measured during an immediately preceding period of time; when this difference becomes negative for the torque and the force, and positive for the temperature, and greater in absolute value than a reference difference, less than 10% of the average value, the casting speed is reduced until the deviation becomes again lower than the reference deviation, then, the casting speed is increased as long as the deviation between the instantaneous value of the parameter and the average value of this parameter during an immediately preceding period of time does not exceed the reference deviation.
  • the method according to the invention consists first of all in considering only certain operating parameters such as the torque exerted on at least one of the cylinders to advance the strip, the force exerted by the strip on one at least of the journals of each cylinder, the temperature of the strip at the outlet of the cylinders. Control and regulation can be carried out on one or two or on the three parameters at the same time.
  • the measurement means are conventional: for the torque, it is possible for example to use the intensity of the electric current which feeds the engine for controlling the rotation of the cylinders or to use the indications of a strain gauge placed on one of the pins ; for the force exerted by the strip, one can place, for example, a strain gauge between the chocks of the cylinders and the clamping screws or measure the hydraulic pressure of the clamping circuit; for temperature, one can take for example a thermoelectric probe or an optical pyrometer mounted so as to be able to scan the entire width of the strip and to make it possible to determine an average value of the temperature.
  • the measurements thus made are sent to a computer such as a computer, minicomputer, microprocessor or programmable controller capable of calculating averages.
  • the invention is characterized in that the difference between the instantaneous value of the parameter and the average value of this same parameter is measured for an immediately preceding period of time. It is therefore necessary that the device which receives the information on the values of the parameters can memorize them over a given period of time At and calculate the average. At this time, it must also be able to measure the difference between the value of the parameter at time t and the average value ne of this same parameter during the period At which has just passed, then to compare it to a reference difference, and, according to the value of this difference, to output or not a signal intended to modify the speed of casting of the machine.
  • any deviation value less than the reference deviation will result in the absence of a signal at the computer output; on the contrary, any higher value will result in a signal to reduce the casting speed.
  • This reduction can be done gradually or in fixed-term steps and continues until the difference becomes less than the reference difference.
  • the average value retained by the computer is that which corresponds to the time period At immediately preceding that when the deviation has become greater than the reference deviation.
  • This reference deviation is, in general, less than 10% of the average value of the parameter considered, and this in order to have a suitable response time.
  • the time period At is preferably less than ten minutes to best follow the fluctuations of the parameter.
  • the reduction corresponding to each stage is less than 15% of the speed value at the instant immediately prior.
  • Each level lasts less than five minutes.
  • the computer sends a speed increase signal whose value is less than 10% of the speed value the previous instant and continues to compare the difference between the instantaneous value of the parameter and the average value of the parameter for an immediately preceding period of time less than five minutes.
  • This increase can also be done gradually or in successive stages. In the latter case, the increase in speed at each level is less than 10% of the speed value at an instant immediately prior, the duration of the level being less than five minutes. The increase continues as long as the deviation for one of the three parameters does not exceed the reference deviation.
  • the casting machine will always operate at the maximum speed compatible with the absence of faults.
  • the cylinders are rotated in opposite directions by means of the motor (10).
  • a machine of the SCAL Jumbo 3C type is used as well as a PER-KIN ELMER 1620 minicomputer.
  • the cast alloy is 1050, the composition of which is described in "Standard for Aluminum Mill Products ”published by the Aluminum Association.
  • the thickness of the strip is 10mm.
  • the torque is measured through the intensity of the machine's cylinder drive motor (direct current motor).
  • the rolling forces are measured by means of two manometers measuring the pressure of the hydraulic circuit on each of the two columns.
  • the temperature of the strip, at the outlet of the cylinders, is measured by an optical pyrometer, which scans the entire surface of the strip.
  • the computer immediately gives an order to slow down the linear speed of the cylinders to a value of 0.05 m / min. If after 10 seconds all the differences between the instantaneous values of the cylinder engine intensity, the two pressures and the belt temperature and the average values of these parameters have not become smaller than the reference deviations, the computer gives a second order to slow down the cylinders by 0.05 m / min. This procedure is repeated until each of the deviations is less than the reference deviation. The casting is then again judged stable and the computer repeats the procedure for increasing the speed described above.
  • the maximum instantaneous speed measured under these conditions is 1.25 m / min, which corresponds to a productivity of approximately 2.02 tonnes per hour and per meter of bandwidth produced. Beyond this, solidification defects appear.
  • maintaining continuous casting at this speed is very difficult because it requires perfect consistency of the temperature of the liquid metal in the pouring spout, the lubrication of the cylinders, etc.
  • the process described above however made it possible to maintain an average speed of approximately 1.22 m / min in continuous operation, ie an average productivity of 1.98 tonnes per hour and per meter of width, and this without any defect in solidification on the strip .
  • the method according to the invention finds its application in the continuous casting of metals between cylinders, in all cases where it is desired to optimize the conditions for obtaining a quality product, and, in particular, to increase productivity.

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  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Continuous Casting (AREA)
  • Paper (AREA)
  • Valve Device For Special Equipments (AREA)
  • Sewing Machines And Sewing (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Saccharide Compounds (AREA)
  • Peptides Or Proteins (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Press Drives And Press Lines (AREA)
  • Coating With Molten Metal (AREA)

Claims (9)

1. Verfahren zum Kontrollieren und Regeln von Betriebsparametern einer Maschine zum Stranggiessen von Bändern zwischen Zylindern, - bei dem wenigstens einer der folgenden Parameter in Betracht gezogen wird: das Drehmoment, das an wenigstens einem der Zylinder für den Vorschub des Bands ausgeübt wird, die Kraft, die vom Band auf wenigstens einen der Drehzapfen ausgebüt wird, und die Temperatur des Bands beim Verlassen der Zylinder, gekennzeichnet
- durch ständiges Messen des Unterschieds zwischen dem Augenblickswert des betrachteten Parameters und dem Mittelwert desselben Parameters während einer unmittelbar vorhergehenden Zeitperiode,
- wobei die Giessgeschwindigkeit verringert wird, bis der Unterschied wieder kleiner als der Bezugsunterschied ist, wenn dieser Unterschied für das Drehmoment und die Kraft negativ und für die Temperatur positiv sowie als Absolutwert grösser als ein Bezugsunterschied wird, der um 10% kleiner als der Mittelwert ist,
- wonach die Giessgeschwindigkeit solange erhöht wird, wie der Unterschied zwischen dem Augenblickswert des Parameters und dem Mittelwert dieses Parameters während einer unmittelbar vorhergehenden Zeitperiode den Bezugsunterschied nicht übersteigt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Mittelwert des Parameters während einer Zeitperiode aufgestellt wird, die derjenigen unmittelbar vorausgeht, bei der der Unterschied grösser als der Bezugsunterschied geworden ist.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die unmittelbar vorhergehende Zeitperiode kleiner als 10 Minuten ist.
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Geschwindigkeit in aufeinanderfolgenden Stufen verringert wird.
5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Giessgeschwindigkeit bei jeder Stufe um einen Wert verringert wird, der kleiner als 15% des Werts der Geschwindigkeit in dem unmittelbar vorhergehenden Augenblick ist.
6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass jede Stufe zur Verringerung der Geschwindigkeit eine Dauer von weniger als 5 Minuten hat.
7. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Geschwindigkeit in aufeinanderfolgenden Stufen erhöhtwird.
8. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Giessgeschwindigkeit in jeder Stufe um einen Betrag erhöht wird, der kleiner als 10% des Werts der Geschwindigkeit in einem unmittelbar vorhergehenden Augenblick ist.
9. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass jede Stufe zur Erhöhung der Geschwindigkeit eine Dauer von weniger als 5 Minuten hat.
EP81420130A 1980-09-01 1981-08-28 Kontroll- und Regelverfahren beim kontinuierlichen Giessen von Bändern Expired EP0047218B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81420130T ATE6217T1 (de) 1980-09-01 1981-08-28 Kontroll- und regelverfahren beim kontinuierlichen giessen von baendern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8019162 1980-09-01
FR8019162A FR2490516A1 (fr) 1980-09-01 1980-09-01 Procede de controle et de regulation de parametres de marche d'une machine de coulee continue de bandes entre cylindres

Publications (3)

Publication Number Publication Date
EP0047218A2 EP0047218A2 (de) 1982-03-10
EP0047218A3 EP0047218A3 (en) 1982-03-17
EP0047218B1 true EP0047218B1 (de) 1984-02-15

Family

ID=9245668

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81420130A Expired EP0047218B1 (de) 1980-09-01 1981-08-28 Kontroll- und Regelverfahren beim kontinuierlichen Giessen von Bändern

Country Status (23)

Country Link
US (1) US4497360A (de)
EP (1) EP0047218B1 (de)
JP (1) JPS5775260A (de)
KR (1) KR870002051B1 (de)
AT (1) ATE6217T1 (de)
AU (1) AU542900B2 (de)
BG (1) BG48925A3 (de)
BR (1) BR8105528A (de)
CA (1) CA1165973A (de)
DD (1) DD201651A5 (de)
EG (1) EG15215A (de)
ES (1) ES8206234A1 (de)
FR (1) FR2490516A1 (de)
GB (1) GB2087100B (de)
GR (1) GR75737B (de)
HU (1) HU188689B (de)
IN (1) IN154438B (de)
MX (1) MX156220A (de)
MY (1) MY8500860A (de)
NO (1) NO157646C (de)
SU (1) SU1215608A3 (de)
TR (1) TR21469A (de)
YU (1) YU44418B (de)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2498099A2 (fr) * 1981-01-19 1982-07-23 Conditionnements Aluminium Sca Procede de controle et de regulation de parametres de marche d'une machine de coulee continue de bandes entre cylindres permettant d'eviter le collage
JPS6017625B2 (ja) * 1982-05-24 1985-05-04 川崎製鉄株式会社 双ロ−ル式急冷薄帯製造方法および装置
EP0138059A1 (de) * 1983-09-19 1985-04-24 Hitachi, Ltd. Verfahren und Vorrichtung zum Giessen eines Metallbandes zwischen zwei Walzen
GB8505199D0 (en) * 1985-02-28 1985-04-03 Bicc Plc Extrusion control
US4678023A (en) * 1985-12-24 1987-07-07 Aluminum Company Of America Closed loop delivery gauge control in roll casting
US4727927A (en) * 1987-01-20 1988-03-01 Hunter Engineering Company, Inc. Casting machine control
FR2621839B1 (fr) * 1987-10-14 1992-02-21 Cegedur Procede de controle et de reglage de la lubrification de la face de travail des cylindres rotatifs d'une machine de coulee continue de bandes
US6272282B1 (en) * 1989-07-20 2001-08-07 Canon Kabushiki Kaisha Recording/reproducing apparatus having means for reproducing signals from a recording block recorded immediately before
DD285649A5 (de) * 1989-10-12 1990-12-19 ������@������������k�� Verfahren zum steuern der arbeitsgeschwindigkeit von verarbeitungsmaschinen
US5031688A (en) * 1989-12-11 1991-07-16 Bethlehem Steel Corporation Method and apparatus for controlling the thickness of metal strip cast in a twin roll continuous casting machine
FR2673865A1 (fr) * 1991-03-12 1992-09-18 Rhenalu Pechiney Procede permettant d'eviter la coulure sur une machine de coulee entre cylindres.
KR920019450A (ko) * 1991-04-10 1992-11-19 라우에너 엔지니어링 악티엔게젤샤프트 롤 캐스팅 방법
US5518064A (en) * 1993-10-07 1996-05-21 Norandal, Usa Thin gauge roll casting method
US6648059B2 (en) * 2001-02-22 2003-11-18 Aktiebolaget Skf Method for detecting a roller failure
US7137434B1 (en) 2004-01-14 2006-11-21 Savariego Samuel F Continuous roll casting of ferrous and non-ferrous metals
CN1329146C (zh) * 2005-01-31 2007-08-01 宝山钢铁股份有限公司 薄带连铸粘辊在线预报方法
CN101722284A (zh) * 2009-09-17 2010-06-09 杭州谱诚泰迪实业有限公司 一种连铸结晶器振动检测装置及检测方法
CN103862018B (zh) * 2014-02-10 2015-07-08 邯钢集团邯宝钢铁有限公司 一种利用数学模型调节连铸机扇形段辊缝的方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR755623A (fr) * 1932-05-16 1933-11-28 Hazelett Metals Inc Procédés, appareils et produits métallurgiques
FR866139A (fr) * 1940-03-04 1941-06-18 Procédé et dispositifs de laminage de métaux et alliages en fusion, y compris les aciers
US3478808A (en) * 1964-10-08 1969-11-18 Bunker Ramo Method of continuously casting steel
US3869891A (en) * 1974-04-08 1975-03-11 Measurex Corp Speed optimizing system for a rolling mill

Also Published As

Publication number Publication date
AU542900B2 (en) 1985-03-21
US4497360A (en) 1985-02-05
JPS617143B2 (de) 1986-03-04
NO157646B (no) 1988-01-18
SU1215608A3 (ru) 1986-02-28
CA1165973A (fr) 1984-04-24
EG15215A (en) 1989-12-30
ATE6217T1 (de) 1984-03-15
NO157646C (no) 1988-04-27
TR21469A (tr) 1984-06-28
EP0047218A2 (de) 1982-03-10
YU207981A (en) 1986-04-30
HU188689B (en) 1986-05-28
EP0047218A3 (en) 1982-03-17
KR830007181A (ko) 1983-10-14
MY8500860A (en) 1985-12-31
GB2087100A (en) 1982-05-19
BG48925A3 (en) 1991-06-14
NO812952L (no) 1982-03-02
GB2087100B (en) 1984-02-01
DD201651A5 (de) 1983-08-03
FR2490516B1 (de) 1982-09-10
JPS5775260A (en) 1982-05-11
ES505074A0 (es) 1982-08-16
KR870002051B1 (ko) 1987-12-03
BR8105528A (pt) 1982-05-18
ES8206234A1 (es) 1982-08-16
IN154438B (de) 1984-10-27
AU7477181A (en) 1982-03-11
FR2490516A1 (fr) 1982-03-26
YU44418B (en) 1990-08-31
GR75737B (de) 1984-08-02
MX156220A (es) 1988-07-26

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