WO2011087225A2 - Buse de coulée immergée et appareil de coulée continue comprenant ladite buse - Google Patents

Buse de coulée immergée et appareil de coulée continue comprenant ladite buse Download PDF

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Publication number
WO2011087225A2
WO2011087225A2 PCT/KR2010/009384 KR2010009384W WO2011087225A2 WO 2011087225 A2 WO2011087225 A2 WO 2011087225A2 KR 2010009384 W KR2010009384 W KR 2010009384W WO 2011087225 A2 WO2011087225 A2 WO 2011087225A2
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WO
WIPO (PCT)
Prior art keywords
pair
discharge
immersion nozzle
molten metal
casting
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Application number
PCT/KR2010/009384
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English (en)
Korean (ko)
Other versions
WO2011087225A3 (fr
Inventor
박철영
최상배
Original Assignee
조선내화 주식회사
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Publication date
Application filed by 조선내화 주식회사 filed Critical 조선내화 주식회사
Priority to CN2010800639373A priority Critical patent/CN102834206A/zh
Publication of WO2011087225A2 publication Critical patent/WO2011087225A2/fr
Publication of WO2011087225A3 publication Critical patent/WO2011087225A3/fr

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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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles

Definitions

  • the present invention relates to a metal casting apparatus, and more particularly, to an immersion nozzle for supplying molten metal to a mold and a continuous casting apparatus including the same.
  • a casting process such as a continuous casting process, refers to a process of continuously casting a molten metal of molten metal through a mold. Melt is injected into the mold from the tundish through the immersion nozzle. The flow of molten metal flowing into the mold and the initial solidification process are one of the factors that determine the properties of the finished cast.
  • the structure of the immersion nozzle can be varied to control the flow of the melt in the mold. If the molten metal is directly lowered into the mold, the penetration depth of the molten metal becomes deeper, thus forming a solidified layer below the mold, which is unstable, and the molten metal may be solidified because the molten metal is not supplied to the molten metal smoothly. On the other hand, when the flotation of the molten metal in the direction of the surface of the molten metal is strong, the surface of the molten metal may become unstable, resulting in uneven formation of the solidification layer of the molten metal, and thus deterioration of cast quality.
  • the present invention is to provide an immersion nozzle and casting apparatus using the same to improve the cast quality in order to solve the above problems.
  • the foregoing problem has been presented by way of example, and the scope of the present invention is not limited by this problem.
  • the casting immersion nozzle of one embodiment of the present invention is provided.
  • the body portion includes an inlet for inflow of the molten metal and an inner hole extending in the longitudinal direction from the inlet.
  • At least one pair of first discharge ports and at least one pair of outlets connected to an end portion of the body portion opposite to the inlet port and inclinedly extended in the longitudinal direction of the longitudinal direction of the body portion such that the melt flows downward in the longitudinal direction of the body portion
  • At least a pair of second outlets disposed outside the first outlets of the apparatus.
  • the at least one pair of second discharge holes may extend inclined radially from the longitudinal center of the body portion so that the molten metal is discharged downward in a direction away from the longitudinal axis center of the body portion. Furthermore, the diameter of the at least one pair of second outlets may be larger than the diameter of the at least one pair of first outlets.
  • the discharge portion includes a bottom portion extending across the longitudinal axis of the body portion and a side wall portion connected to the body portion from the bottom portion, wherein the at least one pair of first discharge holes penetrate the bottom portion.
  • the at least one pair of second outlets may penetrate the side wall.
  • the height of the bottom portion may be lowered away from the longitudinal axis center of the body portion.
  • the body portion may further include a tapered portion that the diameter of the inner hole is larger toward the discharge portion.
  • the body portion includes an inlet for inflow of the molten metal and an inner hole extending in the longitudinal direction from the inlet.
  • the outlet part is connected to the end of the body part opposite the inlet.
  • the discharge portion bottom portion extending across the longitudinal axis of the body portion;
  • a side wall portion connected to the body portion from the bottom portion;
  • At least one pair of first discharge holes extending inclined in the longitudinal direction of the longitudinal direction of the body part such that the molten metal flows downward in the longitudinal direction of the longitudinal direction of the body part;
  • at least one pair of second outlets disposed outside the at least one pair of first outlets and penetrating through the sidewall, and having a diameter greater than that of the at least one pair of first outlets.
  • the continuous casting device of one embodiment of the present invention is provided to include the above-described casting immersion nozzle.
  • the immersion nozzle and the continuous casting apparatus through the combination of the first discharge port and the second discharge port, it is possible to smoothly supply the molten metal to the hot water surface, and to stabilize the hot water surface of the molten metal have. Furthermore, through this, it is possible to adjust the melt flow rate of the hot water surface within the stabilization range for the variation of the casting speed and casting width, it is possible to reduce the shear stress in the immersion nozzle.
  • FIG. 1 is a schematic diagram showing a continuous casting apparatus according to an embodiment of the present invention.
  • FIG. 2 is a perspective view schematically showing an immersion nozzle according to an embodiment of the present invention
  • FIG. 3 is a cross-sectional view taken along line III-III 'of the immersion nozzle of FIG. 2;
  • FIG. 4 is a cross-sectional view schematically showing an immersion nozzle according to another embodiment of the present invention.
  • FIG. 5 is a sectional view schematically showing an immersion nozzle according to an experimental example of the present invention.
  • FIG. 6 is a view showing a flow rate distribution by simulation of the immersion nozzle of FIG. 5; FIG. And
  • FIG. 7 is a diagram illustrating an internal shear stress distribution by simulation of the immersion nozzle of FIG. 5.
  • the molten metal may broadly refer to the liquid phase of the solidification target.
  • molten metal in the casting of a metal may refer to molten metal, and more specifically molten metal in the steel casting may refer to molten steel.
  • FIG. 1 is a schematic diagram illustrating a continuous casting apparatus according to an embodiment of the present invention.
  • the tundish 105 may include a molten metal 50 of molten metal formed at a high temperature therein.
  • Immersion nozzle 100 is connected to the bottom surface of the tundish 105 may be inserted into the mold 140, the end of which defines the slab shape.
  • a plate member (not shown) may be further provided between the immersion nozzle 100 and the tundish 105 to control the amount of the upper nozzle (not shown) and the melt 50.
  • the molten metal 50 is injected into the mold 140 through the immersion nozzle 100 from the tundish 105 and forms an solidification layer 51 to undergo an initial solidification process.
  • the solidification layer 51 exiting the mold 140 is cooled by a cooling medium sprayed through the spray nozzle 156 to form a slab 55 having a predetermined shape, for example, a slab shape.
  • the cast piece 55 is then guided by the guide roller 158 and moved to the next step.
  • the flow and initial solidification process of the molten metal 50 flowing into the mold 140 is one of important factors that determine the properties of the slab 55 in which continuous casting is completed.
  • Continuous casting apparatus according to this embodiment, as will be described later to optimize the structure of the immersion nozzle 100 to increase the stability of the molten metal 50 injected into the mold 140 to improve the quality of the cast (55).
  • FIG. 2 is a perspective view schematically showing an immersion nozzle 100 according to an embodiment of the present invention.
  • 3 is a cross-sectional view taken along line III-III 'of the immersion nozzle 100 of FIG.
  • the immersion nozzle 100 may include a body portion 110 and a discharge portion 120.
  • the body part 110 may include an inlet 112 through which the molten metal (50 of FIG. 1) flows in, and the discharge part 120 may include discharge ports 123 and 126 through which the molten metal 50 flows out.
  • the discharge part 120 may be provided integrally with the body part 110 or may be provided to be separated / combined with the body part 110.
  • the discharge part 120 may refer to a predetermined portion having the discharge holes 123 and 126 of the immersion nozzle 100.
  • the body part 110 may refer to the remaining part from the inlet port 112 to the discharge part 120 along the longitudinal axis V1 of the immersion nozzle 100.
  • the immersion nozzle 100 may be made of a refractory material so as not to be degraded by the hot melt 50.
  • the immersion nozzle 100 may be composed of an oxide, nitride, carbide or a combination thereof.
  • the material of the immersion nozzle 100 has been presented by way of example and does not limit the scope of this embodiment.
  • the body part 110 may include an inlet 112 through which the molten metal 50 is introduced and an inner hole 113 communicating with the inlet 112.
  • the inner hole 113 may extend in the longitudinal axis direction of the immersion nozzle 100 or the body portion 110.
  • the inner hole 113 can have a variety of shapes, the shape of which does not limit the scope of this embodiment.
  • the body part 110 may include a taper part 114 whose diameter D1 increases toward the discharge part 120. Accordingly, the molten metal 50 passing through the inner hole 113 may spread toward the discharge part 120.
  • the discharge part 120 may be connected to an end opposite to the outlet 112 of the body part 110 and may include a bottom part 122 and a side wall part 125.
  • the bottom portion 122 may extend across the longitudinal axis V1 of the body portion 110 to partially close the inner hole 113.
  • the side wall part 125 may extend upward from the bottom part 122 and be connected to an end of the body part 110.
  • the side wall portion 125 may have a bent shape that increases in width from the bottom portion 122 to the body portion 110 or decreases later.
  • the cross section of the discharge part 120 may have a polygonal shape, for example, an octagonal shape, in whole or in part.
  • the bottom portion 122 may have a shape which is swollen inward from the outer circumferential surface 124.
  • the outer circumferential surface 124 may be the bottom of the immersion nozzle 100.
  • the cross section of the discharge part 120 may have a polygonal shape, and the outer circumferential surface 124 may be substantially perpendicular to the longitudinal axis V1 of the body part 110.
  • the height of the bottom portion 122 that is, the thickness of the bottom portion 122 from the outer circumferential surface 124 may be lowered from the longitudinal center V1 of the body portion 110 toward the edge thereof.
  • the at least one pair of first outlets 123 may be connected to the inner hole 113 through the bottom portion 122.
  • the first discharge holes 123 may be symmetrically disposed with respect to the longitudinal axis center V1 of the body part 110.
  • the first discharge holes 123 may be inclined in the direction of the longitudinal axis V1 of the body part 110 so that the molten metal 50 collects in the mold (140 of FIG. 1).
  • the distance from the central portions of the end surfaces of the first discharge holes 123 to the longitudinal axis center V1 of the body part 110 may decrease gradually or gradually from the inside of the discharge part 120 toward the outside.
  • the widths of the first discharge holes 123 may be constant or vary depending on the depth thereof.
  • the molten metal 50 flows downward from the first discharge holes 123 in the direction of the longitudinal axis V1 of the body part 110 and converges in the mold 140 of FIG. 1.
  • the first discharge holes 123 may serve to control the downflow of the molten metal 50 directly into the mold (140 of FIG. 1). Since the molten metal 50 discharged from the first discharge holes 123 collides with each other and spreads, the molten metal 50 may penetrate too deep directly below the mold (140 of FIG. 1) to prevent the formation of a solidified layer. .
  • the at least one pair of second discharge holes 126 may be connected to the inner hole 113 by penetrating the side wall part 125 outside the first discharge holes 123.
  • the second discharge holes 126 may be symmetrically disposed with respect to the longitudinal center V1 of the body part 110.
  • the second discharge holes 126 may extend radially inclined downward from the longitudinal center V1 of the body part 110.
  • the distance from the center of the cross section of the second discharge ports 126 to the longitudinal axis center V1 of the body part 110 may increase gradually or stepwise from the inside of the discharge part 120 to the outside.
  • the widths of the second discharge holes 126 may be constant or vary depending on the depth thereof.
  • the sidewall portion 125 may have a polygonal cross section, and the second discharge holes 126 may pass through at least two surfaces of the sidewall portion 125.
  • Such a shape may contribute to more finely controlling the discharge direction and the amount of the molten metal 50.
  • the molten metal 50 may be discharged downward from the second discharge holes 126 in a direction away from the longitudinal axis center V1 of the body part 110.
  • the molten metal 50 discharged from the second discharge ports 126 may generate a reverse flow flowing toward the water surface by hitting the radially flowing downflow and the mold (140 of FIG. 1).
  • the flow rate of the molten metal 50 can be adjusted within the quality stabilization range with respect to the variation of the casting speed and the casting width.
  • the bath surface of the molten metal 50 is stabilized through the first discharge holes 123, and the diameter D3 of the second discharge holes 126 is larger than the diameter D2 of the first discharge holes 123.
  • FIG. 4 is a cross-sectional view schematically showing an immersion nozzle 100a according to another embodiment of the present invention.
  • the immersion nozzle 100a according to this embodiment is a partial modification of the immersion nozzle 100 of FIGS. 2 and 3, and thus duplicated description is omitted in the two embodiments.
  • the discharge part 120a may include a bottom part 122 and a side wall part 125a.
  • the cross-sectional shape of the discharge part 120a may have a hexagonal shape as a whole or in part.
  • the first discharge holes 123 may be provided to penetrate the bottom part 122, and the second discharge holes 126a may be provided to penetrate the side wall part 125a.
  • the second discharge holes 126a may be distinguished from the discharge holes 126 of FIG. 3 in that the second discharge holes 126a are provided to penetrate at least one surface of the side wall part 125a.
  • the shapes of the discharge parts 120 and 120a are exemplarily shown, and the present invention is not limited to the above-described embodiments.
  • the second discharge holes 126 and 126a have been described as penetrating one side and two sides of the side wall portions 125 and 125a, but may also penetrate two or more sides.
  • the number of the first discharge holes 123 and the second discharge holes 126 and 126a may be two or more.
  • the shape of the bottom 122 can also be modified as appropriate.
  • FIG 5 is a cross-sectional view partially showing an immersion nozzle 300 according to an experimental example of the present invention.
  • the immersion nozzle 300 may include first discharge holes 123 and second discharge holes 126.
  • the immersion nozzle 300 may be substantially the same as the immersion nozzle 100 of FIGS. 2 and 3.
  • FIG. 6 is a diagram illustrating a flow rate distribution by simulation of the immersion nozzle 300 of FIG. 5.
  • the velocity distribution becomes larger toward the red portion and smaller toward the blue portion.
  • the first down stream 52a through the first outlets 123 of FIG. 6 flows out in a converging direction without diverging, and the second down stream 53a flows out downward in a radial direction. Since the flow rates of the first down stream 52a and the second down stream 53a do not differ significantly, it can be seen that the flow rate can be kept constant within the quality stabilization range. A portion of the second down stream 53a is inverted by hitting the mold (140 in FIG. 1) and flows stably in the direction of the water surface. Therefore, according to this experimental example, the flow stability and the surface stability can be secured at the same time.
  • FIG. 7 is a diagram illustrating an internal shear stress distribution by simulation of the immersion nozzle 300 of FIG. 5. In FIG. 7, the shear stress becomes larger toward the red portion and decreases toward the blue portion.
  • the immersion nozzle (300 of FIG. 5) maintains a very low shear stress in the vicinity of the first and second discharge holes (123 and 126 of FIG. 5).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

L'invention concerne une buse de coulée immergée et un appareil de coulée continue comprenant ladite buse. Dans la buse immergée, une partie corps comprend une entrée servant à l'introduction du métal fondu et un orifice interne s'étendant à partir de l'entrée dans la direction de l'axe longitudinal de cette dernière. Une partie évacuation est raccordée à une extrémité de la partie corps du côté opposé à l'entrée. La partie évacuation comprend au moins une paire de premières sorties s'étendant dans la direction du centre de l'axe longitudinal de la partie corps pour évacuer vers le bas le métal fondu dans la direction du centre de l'axe longitudinal de la partie corps ; et au moins une paire de secondes sorties disposées à l'extérieur par rapport à la ou aux paires de premières sorties.
PCT/KR2010/009384 2010-01-18 2010-12-28 Buse de coulée immergée et appareil de coulée continue comprenant ladite buse WO2011087225A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010800639373A CN102834206A (zh) 2010-01-18 2010-12-28 用于铸造的浸入式喷嘴以及包括浸入式喷嘴的连续铸造装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2010-0004280 2010-01-18
KR20100004280A KR101170673B1 (ko) 2010-01-18 2010-01-18 주조용 침지노즐 및 이를 포함하는 연속 주조 장치

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WO2011087225A2 true WO2011087225A2 (fr) 2011-07-21
WO2011087225A3 WO2011087225A3 (fr) 2011-10-27

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CN (1) CN102834206A (fr)
WO (1) WO2011087225A2 (fr)

Families Citing this family (6)

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Publication number Priority date Publication date Assignee Title
CN104096812A (zh) * 2013-04-15 2014-10-15 维苏威高级陶瓷(苏州)有限公司 薄坯板快换浸入式水口
RU2680554C2 (ru) * 2013-11-07 2019-02-22 Везувиус Крусибл Компани Стакан и установка для разливки
CN105727648B (zh) * 2016-04-05 2018-06-22 河南理工大学 脉冲反吹清灰装置及其气体引射器、过滤装置
CN105833623B (zh) * 2016-04-05 2018-10-16 河南理工大学 脉冲反吹清灰装置及其气体引射器、过滤装置
CN105833624B (zh) * 2016-04-05 2018-06-22 河南理工大学 脉冲反吹清灰装置及其气体引射器、过滤装置
CN105771468B (zh) * 2016-04-05 2019-05-21 河南理工大学 脉冲反吹清灰装置及其喷嘴、过滤装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05131250A (ja) * 1991-11-13 1993-05-28 Sumitomo Heavy Ind Ltd 連続鋳造用浸漬ノズル
JPH0641950U (ja) * 1992-11-11 1994-06-03 愛知製鋼株式会社 連続鋳造用浸漬ノズル
IT1284035B1 (it) * 1996-06-19 1998-05-08 Giovanni Arvedi Tuffante per la colata continua di bramme sottili
JPH10128506A (ja) * 1996-10-29 1998-05-19 Nippon Steel Corp 連続鋳造用浸漬ノズル
JPH1147897A (ja) * 1997-07-31 1999-02-23 Nippon Steel Corp 薄肉広幅鋳片連続鋳造用浸漬ノズル
JP2004283850A (ja) 2003-03-20 2004-10-14 Jfe Steel Kk 連続鋳造方法
CN101298093B (zh) * 2008-06-30 2010-08-11 北京科技大学 可抑制csp薄板坯结晶器液面动态失稳的水口

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Publication number Publication date
CN102834206A (zh) 2012-12-19
KR101170673B1 (ko) 2012-08-03
WO2011087225A3 (fr) 2011-10-27
KR20110084628A (ko) 2011-07-26

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