WO2010146621A1 - Procede de coulee en bande mince et machine de coulee entre cylindres - Google Patents

Procede de coulee en bande mince et machine de coulee entre cylindres Download PDF

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Publication number
WO2010146621A1
WO2010146621A1 PCT/JP2009/002704 JP2009002704W WO2010146621A1 WO 2010146621 A1 WO2010146621 A1 WO 2010146621A1 JP 2009002704 W JP2009002704 W JP 2009002704W WO 2010146621 A1 WO2010146621 A1 WO 2010146621A1
Authority
WO
WIPO (PCT)
Prior art keywords
molten metal
strip
nozzle piece
actuator
thickness
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.)
Ceased
Application number
PCT/JP2009/002704
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English (en)
Japanese (ja)
Inventor
大塚裕之
中山勝巳
吉澤廣喜
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.)
IHI Corp
Original Assignee
IHI Corp
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 IHI Corp filed Critical IHI Corp
Priority to BRPI0924932-0A priority Critical patent/BRPI0924932A2/pt
Priority to PCT/JP2009/002704 priority patent/WO2010146621A1/fr
Priority to KR1020117029454A priority patent/KR20120015453A/ko
Publication of WO2010146621A1 publication Critical patent/WO2010146621A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • 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
    • B22D11/064—Accessories therefor for supplying molten metal

Definitions

  • the present invention relates to a strip casting method and a twin roll casting machine.
  • FIG. 1 shows an example of a conventional twin roll casting machine, which includes a pair of cooling rolls 1 arranged horizontally and a pair of side weirs 2 attached to the cooling roll 1.
  • the cooling roll 1 is configured such that cooling water flows through the roll 1 and the roll gap G can be adjusted in accordance with the thickness of the strip 3 to be produced.
  • the rotation direction and speed of the cooling roll 1 are set so that the outer peripheral surface of each cooling roll 1 moves from the upper side toward the roll gap G at a constant speed.
  • One side weir 2 is in surface contact with one end of each cooling roll 1, and the other side weir 2 is in surface contact with the other end of each cooling roll 1, and is surrounded by the cooling roll 1 and the side weir 2.
  • the nozzle piece 4 for supplying molten metal is arranged so as to be located immediately above the roll gap G.
  • the nozzle piece 4 has an elongated nozzle trough 6 for receiving the molten metal 5 at the top, and an opening 7 for supplying the molten metal 5 from the nozzle trough 6 to the cooling roll 1 at a lower end portion of the longitudinal side wall.
  • a plurality of holes are formed so as to be aligned along the axis of the cooling roll 1, and when the molten metal 5 is poured into the nozzle trough 6, a molten metal pool 8 that contacts the outer peripheral surface of the cooling roll 1 is formed.
  • the cooling roll 1 when the cooling roll 1 is rotated by forming the molten metal pool 8 while removing the heat from the cooling roll 1 by circulating the cooling water, the molten metal 5 is solidified on the outer peripheral surface of the cooling roll 1.
  • the solidified shell S is formed.
  • the solidified shell S formed on the outer peripheral surface of the cooling roll 1 is pasted together at the roll gap G, and is sent out as a strip 3 downward. At this time, a load is applied to the neck portions of the cooling rolls 1 so as to approach each other so that the produced strip 3 has a target plate thickness.
  • Patent Document 1 detects the liquid level position of molten steel during operation, controls the rotational speed of a twin roll according to the height of the liquid level, and tries to obtain the steel plate with uniform board thickness.
  • Patent Document 2 detects the current molten metal surface of the molten metal on the surface of the cooling drum when manufacturing a thin metal plate, and the solidified shell generated at the location where the molten metal surface contacts the surface of the cooling drum is the roll gap.
  • Patent document 3 grasps the change of the casting pool height position when manufacturing the strip, and controls the rotation speed of the casting roll and the flow rate of the molten metal supplied to the casting pool to change the thickness of the strip. It is intended to suppress.
  • the control to increase the thickness of the strip 3 is performed by lowering the rotation speed of the cooling roll 1 (lowering the rotation speed) or deepening the molten metal pool 8 to raise the free liquid level, and the metal is cooled. This is achieved by extending the time of touching the outer peripheral surface of the roll 1.
  • the control to reduce the thickness of the strip 3 is performed by increasing the number of rotations of the cooling roll 1 (increasing the rotation speed) or by shallowing the molten metal reservoir 8 to lower the free liquid level position. This is achieved by reducing the time during which the metal touches the outer peripheral surface of the cooling roll 1.
  • JP 60-049836 A Japanese Unexamined Patent Publication No. Sho 63-224846 JP-A-10-263758
  • the moving speed of the strip 3 fed from the twin roll casting machine also changes according to the rotation speed of the cooling roll 1. It is necessary to adjust the plate passing speed of the strip 3 in the rolling device, the cooling device, and the winding device located in the subsequent process so as to correspond to the change in the number of rotations of the cooling roll 1. Speed control is required.
  • the range in which the nozzle piece 4 is immersed fluctuates, and the molten metal pool 8 is swung.
  • impurities such as oxides adhering to the nozzle piece 4 fall into the molten metal pool 8 and solidify. If it is caught in the shell, the quality of the strip 3 is deteriorated.
  • the thickness variation of the strip 3 is not influenced only by the time when the metal is in contact with the outer peripheral surface of the cooling roll 1, but the surface roughness and cleanliness of the outer peripheral surface of the cooling roll 1 (adhesive layer such as oxide) Therefore, it is difficult to adjust the thickness of the strip 3 by paying attention only to the depth of the molten metal reservoir 8 because it is also affected by the composition of the atmospheric gas in the place where the twin roll casting machine is installed.
  • the present invention has been made in view of the above-described circumstances, and an object of the present invention is to appropriately adjust the strip thickness while avoiding quality defects.
  • the molten metal supplied from the tundish is cooled as a molten metal pool in which a predetermined range of the nozzle piece is immersed through a nozzle piece arranged between a pair of cooling rolls.
  • the tundish will move to the molten metal pool.
  • the amount of molten metal to be filled is reduced to make the molten metal reservoir shallow, and in parallel with this molten metal replenishment operation, the free liquid surface position of the molten metal reservoir is obtained, so that the relative position of the nozzle piece to the molten liquid free liquid surface is constant.
  • the nozzle piece is displaced vertically.
  • An actuator for adjusting the position of the molten metal up and down, a gate provided in the molten metal supply passage from the tundish to the nozzle piece and opened and closed by the actuator for adjusting the flow rate, the free liquid level of the molten metal pool and the outer peripheral surface of the cooling roll Which measures the thickness of the strip sent from between the cooling rolls, a position calculating means for obtaining the current free liquid level position of the molten metal pool based on an image signal transmitted from the camera, A thickness sensor and an actuator for adjusting the flow rate according to the measured value of the plate thickness sensor are operated, and the position calculating And a control means for operating the actuator for position adjustment according to the calculated value, and a deviation between a predetermined target value of the strip thickness and a measured value of the strip
  • the strip thickness starts to decrease, the lack of heat removal is compensated for by increasing the time during which the molten metal pool is deepened and the metal is in contact with the outer peripheral surface of the cooling roll.
  • the free liquid surface of the molten metal pool and the nozzle piece The nozzle piece is displaced in the vertical direction so that the relative position is constant, and the control of preventing the molten metal pool from swinging is also used, so that impurities such as oxides adhering to the nozzle piece fall into the molten metal pool.
  • the strip thickness can be adjusted appropriately while avoiding poor quality without being caught in the solidified shell.
  • FIG. 2 shows an example of the twin roll casting machine of the present invention.
  • a pair of cooling rolls 1 arranged horizontally a pair of side weirs 2 attached to the cooling roll 1, and a nozzle piece 4.
  • a tundish 9 for storing the molten metal 5 to be supplied to the nozzle piece 4 a slide gate 11 provided in the molten metal supply flow path from the tundish 9 to the nozzle piece 4 and opened and closed by a flow rate adjusting actuator 10.
  • a support 12 that supports the nozzle piece 4 and can be displaced up and down and a position adjustment actuator 13 that displaces the nozzle piece 4 up and down via the support 12 are provided.
  • the slide gate 11 has a partition plate 11a capable of closing the hole 9a for flowing down the molten metal formed in the bottom of the tundish 9, and the actuator 10 moves the partition plate 11a to adjust the opening degree of the hole 9a.
  • the camera 14 that captures the boundary between the free liquid level of the molten metal pool 8 and the outer peripheral surface of the cooling roll 1, and image analysis processing is performed based on the image signal transmitted from the camera 14 to perform the molten metal pool.
  • a position calculating means 15 for determining the current free liquid level position
  • a plate thickness sensor 16 for measuring the plate thickness of the strip 3 fed from between the cooling rolls 1, and a flow rate according to the measured value of the plate thickness sensor 16.
  • a control unit 17 that operates the adjustment actuator 10 and operates the position adjustment actuator 13 in accordance with the calculated value of the position calculation unit 15.
  • a screw jack is used for the actuators 10 and 13 and an X-ray gauge is used for the plate thickness sensor 16, for example.
  • the control means 17 uses the deviation between the target value of the strip 3 thickness and the measured thickness of the strip 3 obtained from the thickness sensor 16 as a parameter when the strip thickness of the strip 3 starts to decrease during operation.
  • the actuator 10 for adjusting the flow rate is operated so that the replenishment amount of the molten metal 5 from the tundish 9 to the molten metal reservoir 8 temporarily increases, the molten metal reservoir 8 is deepened to raise the free liquid level position, and the cooling roll
  • the plate thickness gradual increase control that extends the time during which the metal (molten metal 5 and solidified shell S) is in contact with the outer peripheral surface of 1, when the plate thickness of the strip 3 starts to increase during operation.
  • the flow rate adjusting actuator 10 is operated so that the replenishment amount of the molten metal 5 from the dish 9 to the molten metal reservoir 8 is temporarily reduced, the molten metal reservoir 8 is shallowed to lower the free liquid level, and the metal is the cooling roll 1 Outer peripheral surface Performing a thickness decreasing control to reduce the The times mentioned, but does not changing the rotation
  • the thickness of the strip 3 increases as the molten metal reservoir 8 is deeper, but the thickness of the strip 3 is not determined only by the position of the free liquid surface of the molten metal reservoir 8. Moreover, the relationship between the thickness of the solidified shell S and the cooling time is not actually a simple proportional relationship, and the solidification rate tends to gradually decrease, but for convenience, the solidification rate during operation is unchanged. Assuming that, a value of solidification constant K [mm / min 0.5 ] may be used.
  • the control means 17 is based on the current free liquid surface position of the molten metal reservoir 8 obtained from the position calculating means 15 and increases the replenishment amount of the molten metal 5 to increase the free liquid.
  • the position adjusting actuator 13 is operated so that the nozzle piece 4 rises following the free liquid level position, and the relative position of the free liquid level between the nozzle piece 4 and the molten metal reservoir 8 is made constant.
  • the nozzle piece 4 is used for position adjustment so as to descend following the free liquid level position.
  • the actuator 13 is operated to execute position lowering control for keeping the relative position of the free liquid level of the nozzle piece 4 and the molten metal reservoir 8 constant.
  • the position calculation means 15 obtains the current free liquid level position of the molten metal reservoir 8, and the control means 17 sets the preset plate 3 of the strip 3. While comparing the target value of the thickness with the measured value of the thickness of the strip 3 obtained from the thickness sensor 16, the actuator 10 for adjusting the flow rate is operated as described below, and the molten metal pool obtained from the position calculating means 15 is obtained.
  • the position adjusting actuator 13 is operated according to the current free liquid level position of No. 8.
  • the control means 17 causes the actuator 10 for adjusting the flow rate so that the opening degree of the slide gate 11 is expanded for a predetermined time.
  • the molten metal reservoir 8 is deepened, the position of the free liquid level is increased, the time during which the metal (the molten metal 5 and the solidified shell S) is in contact with the outer peripheral surface of the cooling roll 1 is extended, the lack of heat removal is eliminated, and the strip 3 The plate thickness gradually increases toward the target value.
  • the control means 17 operates the position adjusting actuator 13 so that the nozzle piece 4 rises following the free liquid level position, thereby freeing the nozzle piece 4 and the molten metal reservoir 8. Since the relative position of the liquid level is kept constant without changing, the molten metal pool 8 does not swing. Therefore, it is possible to avoid the defective quality of the strip 3 caused by impurities such as oxides adhering to the nozzle piece 4 dropping into the molten metal pool 8 and being caught in the solidified shell S.
  • the control means 17 causes the actuator 10 for flow rate adjustment so that the opening degree of the slide gate 11 is narrowed for a predetermined time.
  • the molten metal reservoir 8 becomes shallow, the free liquid surface position is lowered, the time during which the metal (the molten metal 5 and the solidified shell S) is in contact with the outer peripheral surface of the cooling roll 1 is shortened, excess heat removal is eliminated, and the strip 3 The plate thickness gradually decreases toward the target value.
  • the control means 17 When the free liquid level position is lowered, the control means 17 operates the position adjusting actuator 13 so that the nozzle piece 4 descends following the free liquid level position, so that the nozzle piece 4 and the molten metal reservoir 8 are free. Since the relative position of the liquid level is kept constant without changing, the molten metal pool 8 does not swing. Therefore, it is possible to avoid the defective quality of the strip 3 caused by impurities such as oxides adhering to the nozzle piece 4 dropping into the molten metal pool 8 and being caught in the solidified shell S.
  • strip casting method and twin roll casting machine of the present invention are not limited to the above-described embodiments, and it goes without saying that modifications can be made without departing from the scope of the present invention.

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

Abstract

Selon l'invention, outre le contrôle d'épaisseur de plaque d'une bande mince (3) pour rattraper l'évacuation insuffisante de la chaleur par approfondissement d'un puits métallique fondu (8) formé entre les rouleaux de refroidissement (1) de façon à prolonger le temps pendant lequel le métal touche les surfaces circonférentielles externes des rouleaux de refroidissement (1), et le contrôle d'épaisseur de plaque de la bande mince (3) pour réguler l'évacuation excessive de la chaleur par réduction du puits métallique fondu (8) de façon à écourter le temps pendant lequel le métal touche les surfaces circonférentielles externes des rouleaux de refroidissement (1); le contrôle est effectué de façon combinée afin d'empêcher que le puits métallique fondu (8) se balance par déplacement d'un porte-buse (4) verticalement par le biais d'un actionneur (13), ainsi la position du niveau de liquide libre du puits métallique fondu (8) par rapport au porte-buse (4) devient constante, ce qui empêche les impuretés telles que des oxydes collant au porte-buse de tomber dans le puits métallique fondu (8).
PCT/JP2009/002704 2009-06-15 2009-06-15 Procede de coulee en bande mince et machine de coulee entre cylindres Ceased WO2010146621A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BRPI0924932-0A BRPI0924932A2 (pt) 2009-06-15 2009-06-15 Método de lingotamento de tiras e máquina de lingotamento de cilindro duplo
PCT/JP2009/002704 WO2010146621A1 (fr) 2009-06-15 2009-06-15 Procede de coulee en bande mince et machine de coulee entre cylindres
KR1020117029454A KR20120015453A (ko) 2009-06-15 2009-06-15 스트립 주조 방법 및 쌍롤 주조기

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2009/002704 WO2010146621A1 (fr) 2009-06-15 2009-06-15 Procede de coulee en bande mince et machine de coulee entre cylindres

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WO2010146621A1 true WO2010146621A1 (fr) 2010-12-23

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PCT/JP2009/002704 Ceased WO2010146621A1 (fr) 2009-06-15 2009-06-15 Procede de coulee en bande mince et machine de coulee entre cylindres

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BR (1) BRPI0924932A2 (fr)
WO (1) WO2010146621A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101309877B1 (ko) * 2011-11-15 2013-09-17 주식회사 포스코 턴디쉬 노즐 셋팅장치

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6068139A (ja) * 1983-09-21 1985-04-18 Kawasaki Steel Corp 急冷薄帯の製法
JPH02205234A (ja) * 1989-02-02 1990-08-15 Nippon Kinzoku Kogyo Kk 薄肉鋳片連続鋳造における湯面レベル検出方法
JPH06297111A (ja) * 1993-04-19 1994-10-25 Nippon Steel Corp 双ロール式薄板連続鋳造機の雰囲気ガスシール装置
JPH08226844A (ja) * 1994-12-09 1996-09-03 Ishikawajima Harima Heavy Ind Co Ltd 双ロール鋳造機の溶湯溜り深さモニター装置及び方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6068139A (ja) * 1983-09-21 1985-04-18 Kawasaki Steel Corp 急冷薄帯の製法
JPH02205234A (ja) * 1989-02-02 1990-08-15 Nippon Kinzoku Kogyo Kk 薄肉鋳片連続鋳造における湯面レベル検出方法
JPH06297111A (ja) * 1993-04-19 1994-10-25 Nippon Steel Corp 双ロール式薄板連続鋳造機の雰囲気ガスシール装置
JPH08226844A (ja) * 1994-12-09 1996-09-03 Ishikawajima Harima Heavy Ind Co Ltd 双ロール鋳造機の溶湯溜り深さモニター装置及び方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101309877B1 (ko) * 2011-11-15 2013-09-17 주식회사 포스코 턴디쉬 노즐 셋팅장치

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BRPI0924932A2 (pt) 2015-07-07
KR20120015453A (ko) 2012-02-21

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