EP2193000A2 - Appareil et procédé permettant de réguler la forme de la rive d'une bande lors d'un processus de coulée en bande mince - Google Patents

Appareil et procédé permettant de réguler la forme de la rive d'une bande lors d'un processus de coulée en bande mince

Info

Publication number
EP2193000A2
EP2193000A2 EP08833282A EP08833282A EP2193000A2 EP 2193000 A2 EP2193000 A2 EP 2193000A2 EP 08833282 A EP08833282 A EP 08833282A EP 08833282 A EP08833282 A EP 08833282A EP 2193000 A2 EP2193000 A2 EP 2193000A2
Authority
EP
European Patent Office
Prior art keywords
edge
strip
wear
dams
upward
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.)
Withdrawn
Application number
EP08833282A
Other languages
German (de)
English (en)
Other versions
EP2193000A4 (fr
Inventor
Yoon-Ha Kim
Sang-Hoon Kim
Han-Nam Cheong
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.)
Posco Holdings Inc
Original Assignee
Posco Co Ltd
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.)
Filing date
Publication date
Application filed by Posco Co Ltd filed Critical Posco Co Ltd
Publication of EP2193000A2 publication Critical patent/EP2193000A2/fr
Publication of EP2193000A4 publication Critical patent/EP2193000A4/fr
Withdrawn legal-status Critical Current

Links

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
    • B22D11/16—Controlling or regulating processes or operations
    • 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
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • B22D11/185—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by using optical means
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/066—Side dams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles

Definitions

  • the present invention relates to the control of the edge shape of a strip in strip casting, and more particularly to an apparatus and method for controlling the edge shape of a strip in a twin-roll strip casting process, which improve the quality of the strip by using cameras to photograph the edge portions of the strip being cast by strip casting, analyzing the photographs, and then controlling edge dams according to the edge shape of the strip.
  • FIG. 1 is a view showing the construction of a strip casting apparatus according to the prior art. As shown in FIG. 1, an important process for strip casting generally occurs in a sump between two rolls 1 and 2 that rotate in directions opposite to each other.
  • the molten steel When molten steel is supplied to the sump 9 through a submerged entry nozzle 5 from a tundish 4, the molten steel is solidified between a leader strip and the two rolls within 0.2 seconds and rolled.
  • the molten steel, the leader strip that is solidified and a strip that is solidified and follows the leader strip generate roll separating force (RSF).
  • the roll force is sensed by a load cell 10 placed at the rear part of the rolls. The sides of the two rolls are blocked with ceramic edge dams 8 in order to prevent molten steel from flowing out through the sides of the rolls.
  • the solidification capability of molten steel is proportional to the cooling capability of the casting rolls.
  • the solidification capability is influenced by the distance between the two rolls, that is, the roll gap, the casting speed (rotating speed) of the rolls, and the height of molten steel in the sump.
  • the height of molten steel is measured using a height detection sensor 7.
  • m general, when molten steel solidifies, it generates roll force between the rolls.
  • the rolling reduction rate is influenced by the roll gap and the casting speed.
  • the roll gap is measured using a distance measuring unit 3. For example, if the roll gap is excessively great or if the casting speed is excessively high, the solidification point will decrease below the temperature of the center line of roll nips, such that the roll force gradually decreases, thus causing the non- solidification of molten steel and strip breakdown. In the contrary case, the solidification point will increase, leading to high roll force. Therefore, the roll gap, the casting speed and the roll force are typical casting parameters indicating the solidification properties of the strip.
  • the control of the height of molten steel fundamentally requires a high degree of precision and stability. Thus, it is sought to maintain the height of molten steel at a target value starting from immediately after the start of casting. Accordingly, the roll force may seem to result from the relationship between the roll gap and the casting speed.
  • the sides of the two rolls are blocked with edge dams made of a ceramic material.
  • edge dams made of a ceramic material.
  • molten steel can flow into the gap. If molten steel flows into the gap, it will deteriorate the quality of the side of a cast strip, that is, the edge quality of the cast strip, thus reducing the value of the cast strip and abnormally wearing the ceramic material of the edge dam to make normal casting impossible.
  • edge dams are oscillated to remove the skull from the edge dams in a very small skull state at the same time at which the skull is produced.
  • the oscillation of the edge dams additionally wears the seal plate of the edge dams to form an unnecessarily worn portion between the seal plate of the edge dams and the end face of the rolls, and if molten steel penetrates into and is solidified in that portion, burrs will be formed on a cast strip being produced, thus making the edge shape of the strip poor.
  • the efficient control of the edge dams in a twin-roll strip casting process intended for long-term casting is important for producing a high-quality strip and also plays a key role in reducing the production cost by reducing the wear amount of the edge dams.
  • the edge quality of a cast strip being produced is one of the most important indices determining the superiority and inferiority of the cast strip product. Such issues must be solved in order to improve quality and productivity, and thus a control method for solving them is required.
  • the present invention has been made in order to solve the above- described problems occurring in the prior art, and it is an object of the present invention to provide an apparatus and method for controlling the edge shape of a strip in a twin-roll strip casting process, which comprise observing with a camera a strip being produced in situ, transmitting the observation results to an operation room, analyzing the edge quality of the strip through image processing, and then increasing or decreasing the wear rate and upward shift rate of the edge dams depending on the quality of the strip, thus improving the edge quality of the strip and increasing the life span of the expensive edge dams.
  • the present invention provides an apparatus for controlling the edge shape of a strip in a twin-roll strip casting process, the apparatus comprising: an edge dam driving unit which is attached to edge dams attached to both sides of casting rolls so as to control the pressing force of the edge dams against the casting rolls and the upward shift of the edge dams according to the wear and upward shift rate of the edge dams; cameras which are disposed at the strip outlet side of the casting rolls so as to photograph the edge portions of the strip; and a control unit which analyzes the edge shape of the strip from images photographed by the cameras and outputs a signal controlling the wear and upward shift of the edge dams.
  • the edge dam driving unit may include: an upward cylinder which is disposed at the upper area of the center of the side opposite the side of the edge dams that comes in contact with the casting rolls, so as to move the edge dams upward; and wear cylinders which are disposed at the left and right sides of the upper portion of the edge dams and at the lower portion of the center of the edge dams so as to press the edge dams against the casting rolls.
  • the control unit may include: a main control unit which analyzes the strip edge images photographed by the cameras so as to calculate the wear and upward shift rate of the edge dams; an upward-shift control unit which outputs a signal driving the upward cylinder depending on the upward shift rate and target shift rate of the main control unit; an upward-cylinder servo-valve which drives the upward cylinder according to the driving signal of the upward-shift control unit; a wear control unit which outputs a signal driving the wear cylinders according to the wear rate calculated in the main control unit; and a wear cylinder servo-valve which drives the wear cylinders according to the driving signal of the wear control unit.
  • the present invention provides a method for controlling the edge shape of a strip in a twin-roll casting process, the method comprising: a photographing step of photographing images of the edge portions of the strip using cameras disposed at the strip outlet sides of casting rolls; a control signal- producing step of analyzing the strip edge images photographed in the photographing step and outputting a control signal for a wear and upward shift rate; and an edge dam control step of controlling the wear and upward shift of edge dams according to the control signal output in the control signal-producing step.
  • the control signal-producing step may include: an edge analysis step of calculating the burr thickness of the edge dams and the length of an edge fin; a step of outputting a signal for maintaining the edge dams at a default wear and upward shift rate set in the normal state of the edge dams, if the edge analysis step shows a burr thickness of less than 1 mm and no existence of an edge fin; a step of outputting a signal for additionally applying a wear and upward shift rate of 1 ⁇ m per m of the strip to the default wear and upward shift rate, if the edge analysis step shows a burr thickness of more than 1 mm but less than 5 mm and an edge fin length of less than 1 cm; and a step of outputting a signal for additionally applying a wear and upward shift rate of 1.5 ⁇ m per m of the strip to the default wear and upward shift rate, if the edge analysis step shows a burr thickness of more than 5 mm and an edge fin length of more than 1 cm.
  • the edge dam control step may include the steps of: re-analyzing the edge portions of the strip after performing the control of the edge dams according to the signal output in the control signal-producing step; and controlling the edge dams so as to return to the default value of the edge dam wear and upward shift rate, if the edge portions are normal.
  • the default value of the wear and upward shift rate of the edge dams may be set within the range of 0.5 to 5 ⁇ m per m of the strip.
  • control signal-producing step and the edge dam control step may be manually carried out.
  • the present invention provides the effect of improving the quality and productivity of a strip in a twin-roll strip casting process.
  • the present invention provides the effect of allowing an expensive edge dam to be used for a long period of time.
  • the present invention provides the effects of suppressing the generation of strip scraps and extending the life span of an edge dam, thus reducing production cost.
  • FIG. 1 is a view showing the construction of a strip casting apparatus according to the present invention.
  • FIG. 2 is a block diagram of an apparatus for controlling the edge shape of a strip in a twin-roll strip casting process (hereinafter referred to as "edge shape control apparatus") according to an embodiment of the present invention.
  • FIG. 3 is a view showing the position of cylinders attached to an edge dam.
  • FIG. 4 is a flowchart showing the processing procedure of the inventive method for controlling the edge shape of a strip in a twin-roll strip casting process.
  • FIG. 2 is a block diagram showing the construction of an apparatus for controlling the edge shape of a strip in a twin-roll strip casting process
  • FIG. 3 is a view showing the position of cylinders attached to an edge dam.
  • the edge shape control apparatus comprises an edge dam driving unit 100 which is attached to both sides of casting rolls so as to control the pressing force of the edge dams against the casting rolls and the upward shift of the edge dams depending on the wear and upward shift rate of the edge dams; cameras 200 which are disposed at both sides of the edge dams at the outlet side of the casting rolls 12 through which a strip 12 is discharged, the cameras serving to photograph the edge portion of the strip; and a control unit 300 which analyzes the images photographed by the cameras 200 so as to analyze the burr thickness and edge fin length of the edge portion and outputs to the edge dam driving unit 100 a signal controlling the wear and upward shift rate of the edge dams according to the thickness of a burr and the length of an edge fin.
  • the edge dam driving unit 100 comprises: an upward cylinder 101 which is disposed at the upper area of the center of the side opposite the side of the edge dams that comes in contact with the casting rolls, so as to move the edge dam upward; and a wear cylinder 102 which is disposed horizontally at the back side of the edge dams so as to control the forward and backward movement of the edge dams 100 with respect to the casting rolls.
  • the upward cylinder 101 which is disposed at the upper area is connected to the upper portion 111 of the back side of the edge dam 110 as shown in FIG. 3.
  • the wear cylinder 102 is disposed at the back side of the edge dam 110 in order to move the edge dam forward and backward with respect to the casting rolls.
  • the wear cylinder 102 may also be disposed at the back side of the edge dams at each of both sides 112 and 113 of the upper portion of the edge dams and the lower portion 114 of the center of the edge dams.
  • the cameras 200 are disposed at a strip outlet side through which a cast strip is discharged.
  • the cameras photograph the edge portion of the strip 12 with a resolution allowing the edge portion to be analyzed up to a millimeter scale, and output the photographed images to the control unit 300.
  • the control unit 300 comprises: a main control unit 310 which analyzes the strip edge images photographed by the cameras 200 so as to calculate the wear and upward shift rate of the edge dams; an upward-shift control unit 320 which outputs a signal driving the upward cylinder 101 depending on the upward shift rate and target shift rate of the main control unit 310; a first DA converter 321 which converts the driving signal of the upward-shift control unit 320 to an analog signal; a servo-valve 322 which drives the upward cylinder 101 according to the output signal of the first DA converter 321; a first distance measuring sensor 323 which is disposed at each of the casting rolls 1 and 2 so as to sense the upward moving distance of the edge dam 110; a first AD converter 324 which converts the output signal of the first distance measuring sensor 323 to a digital signal and then outputs the digital signal to the upward shift control unit 320; a wear control unit 330 which outputs a signal driving the wear cylinder 102 according to the edge dam wear rate and target wear rate of the main control unit 320;
  • the edge shape control apparatus of the present invention performs the control of the pressing force of the edge dam against the casting rolls and the upward shift of the edge dam to the default set wear and upward shift rate of the edge dam while performing casting as in the prior art.
  • the default set wear and upward shift rate of the edge dam can be set within the range of 0.5-5 ⁇ m per m of a strip.
  • the cameras 200 continuously photograph images of the edge portions of the strip being cast and discharged and output the images to the control unit 300 (Sl).
  • control unit 300 analyzes the strip edge images photographed by the cameras 200 and determines whether the state of the strip edge is poor (S2 and S3). If the state of the edge is determined to be poor, the control unit 300 produces and outputs a signal for controlling the wear and upward shift of the edge dams. An example of the wear and upward shift rate of the edge dams will now be described.
  • the main control unit If the burr thickness of the edge portion is less than 1 mm and no edge fin exists in the strip images photographed by the cameras 200, the main control unit
  • the 310 outputs a signal maintaining the edge dams at the wear and upward shift rate set at a default value in the normal state of the edge dams.
  • the wear and upward shift rate set at a default value in the normal state of the edge dams can be set within the range of 0.5 to 5 ⁇ m per m of the strip as described above. If the burr thickness of the strip edge is more than 1 mm but less than 5 mm and the length of the edge fin is less than 1 cm, the main control unit 310 outputs a signal for additionally applying a wear and upward shift rate of 1 ⁇ m per m of the strip to the default set value.
  • the main control unit 310 outputs a signal for additionally applying a wear and upward shift rate of 1.5 ⁇ m per m of the strip to the default set value.
  • Such output signals of the main control unit 310 are input into the shift control unit 320 and the wear control unit 330 so as to drive the upward cylinder 101 and wear cylinder 102 connected to the back side of the edge dam 110, thus controlling the pressing force of the edge dam against the casting rolls and the upward shift of the edge dam (S4).
  • the edge portions of the strip 12 which is produced while controlling the wear and upward shift rate of the edge dam 110 are continuously photographed with the cameras 200 in order to determine whether the state of the edge portions has been restored to the normal state (S5).
  • control unit 300 continually controls the wear and upward shift of the edge dam according to the edge dam wear and upward shift rate output in step S4. However, if the state of the edge portions has returned to the normal state, the edge dam wear and upward shift rate of the edge dam returns to the initially set default value, and the pressing force of the edge dam against the casting rolls and the upward shift rate of the edge dam are controlled (S6).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

L'invention porte sur un appareil et un procédé qui permettent de réguler la forme de la rive d'une bande lors d'un processus de coulée en bande mince entre cylindres et d'améliorer de la sorte la qualité de la bande obtenue, lequel procédé fait appel à des appareils photographiques qui photographient les parties de rive de la bande soumise à la coulée en bande, les photographies obtenues étant ensuite analysées, et les parois d'obturation latérale régulées en fonction de la forme de la rive de la bande. L'appareil de l'invention comprend: une unité d'entraînement de parois d'obturation latérale qui est reliée aux parois d'obturation latérale fixées de part et d'autre des cylindres de coulée afin de réguler la force de pression desdites parois sur les cylindres de coulée ainsi que le déplacement vers le haut desdites parois en fonction de leur vitesse d'usure et de déplacement vers le haut; des appareils photographiques qui sont disposés du côté de sortie de bande des cylindres de coulée afin de photographier les parties de rive de la bande; et une unité de commande qui analyse la forme de la rive de la bande à partir des images photographiées par les appareils photographiques et qui émet un signal permettant de réguler l'usure et le déplacement vers le haut des parois d'obturation latérale.
EP08833282.0A 2007-09-28 2008-09-25 Appareil et procédé permettant de réguler la forme de la rive d'une bande lors d'un processus de coulée en bande mince Withdrawn EP2193000A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020070097701A KR100977783B1 (ko) 2007-09-28 2007-09-28 쌍롤형 박판 제조공정에서 주편 스트립의 에지형상 제어장치 및 방법
PCT/KR2008/005697 WO2009041777A2 (fr) 2007-09-28 2008-09-25 Appareil et procédé permettant de réguler la forme de la rive d'une bande lors d'un processus de coulée en bande mince

Publications (2)

Publication Number Publication Date
EP2193000A2 true EP2193000A2 (fr) 2010-06-09
EP2193000A4 EP2193000A4 (fr) 2015-01-28

Family

ID=40512022

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08833282.0A Withdrawn EP2193000A4 (fr) 2007-09-28 2008-09-25 Appareil et procédé permettant de réguler la forme de la rive d'une bande lors d'un processus de coulée en bande mince

Country Status (7)

Country Link
US (1) US20110073271A1 (fr)
EP (1) EP2193000A4 (fr)
JP (1) JP5127926B2 (fr)
KR (1) KR100977783B1 (fr)
CN (1) CN101801562B (fr)
AU (1) AU2008304045B2 (fr)
WO (1) WO2009041777A2 (fr)

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KR101243117B1 (ko) * 2009-12-17 2013-03-12 주식회사 포스코 쌍롤식 박판 주조공정의 에지댐 제어 방법
CN102198495B (zh) * 2010-03-26 2013-05-29 宝山钢铁股份有限公司 双辊薄带连铸侧封控制方法及装置
JP5837758B2 (ja) 2011-04-27 2015-12-24 キャストリップ・リミテッド・ライアビリティ・カンパニー 双ロール鋳造装置及びその制御方法
KR101309920B1 (ko) * 2011-12-13 2013-09-17 주식회사 포스코 에지댐의 진동 측정 장치 및 방법
KR101372681B1 (ko) 2011-12-21 2014-03-10 주식회사 포스코 쌍롤식 박판 주조공정에서의 에지 벌징 저감 방법 및 시스템
JP5924246B2 (ja) * 2012-11-22 2016-05-25 トヨタ自動車株式会社 引上式連続鋳造装置、引上式連続鋳造方法、及び凝固界面検出装置
JP6315729B2 (ja) * 2013-12-23 2018-04-25 ポスコＰｏｓｃｏ 鋳片スカーフィング装置およびその制御方法
KR101620700B1 (ko) * 2014-07-24 2016-05-13 주식회사 포스코 쌍롤식 박판 주조 방법
CN112247085B (zh) * 2020-09-07 2021-10-19 东北大学 一种薄带连铸侧封压紧机构的控制方法及装置
CN115519096B (zh) * 2022-09-19 2023-08-01 江苏中科云控智能工业装备有限公司 基于大数据的压铸件去毛刺装备状态检测系统及方法

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Also Published As

Publication number Publication date
AU2008304045B2 (en) 2011-10-06
JP5127926B2 (ja) 2013-01-23
CN101801562B (zh) 2013-03-06
WO2009041777A2 (fr) 2009-04-02
WO2009041777A3 (fr) 2009-06-11
JP2010536580A (ja) 2010-12-02
EP2193000A4 (fr) 2015-01-28
CN101801562A (zh) 2010-08-11
KR100977783B1 (ko) 2010-08-24
KR20090032443A (ko) 2009-04-01
US20110073271A1 (en) 2011-03-31
AU2008304045A1 (en) 2009-04-02

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