EP3795273B1 - Moule - Google Patents

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Publication number
EP3795273B1
EP3795273B1 EP19804126.1A EP19804126A EP3795273B1 EP 3795273 B1 EP3795273 B1 EP 3795273B1 EP 19804126 A EP19804126 A EP 19804126A EP 3795273 B1 EP3795273 B1 EP 3795273B1
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EP
European Patent Office
Prior art keywords
short side
mold
convex member
side part
exemplary embodiment
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.)
Active
Application number
EP19804126.1A
Other languages
German (de)
English (en)
Other versions
EP3795273A4 (fr
EP3795273A1 (fr
EP3795273C0 (fr
Inventor
Seong Yeon Kim
Hyoung Jun Lee
Kyung Chul Cho
Ji Joon Kim
Hyun Jin Cho
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 EP3795273A4 publication Critical patent/EP3795273A4/fr
Publication of EP3795273A1 publication Critical patent/EP3795273A1/fr
Application granted granted Critical
Publication of EP3795273B1 publication Critical patent/EP3795273B1/fr
Publication of EP3795273C0 publication Critical patent/EP3795273C0/fr
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Anticipated expiration legal-status Critical

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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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0406—Moulds with special profile
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/057—Manufacturing or calibrating the moulds

Definitions

  • the present invention relates to a mold, and more particularly, to a mold capable of suppressing or preventing a defect generated in a slab and a damage on the slab.
  • a slab is manufactured as molten steel accommodated in a mold is cooled while passing through a cooling bed.
  • a continuous casting process manufactures various shaped products such as a slab, a bloom, a billet, and a beam blank by injecting molten steel to a mold having a predetermined inner shape and continuously drawing a semi-solidified slab through a lower side of the mold.
  • the slab is manufactured by using a rectangular mold obtained by assembling long side parts and short side parts.
  • a solidification shell is formed from a surface of the molten steel in the mold, and a thickness of the solidification shell gradually increases in a downward direction. Also, solidification contraction is generated because a temperature gradually decreases in the downward direction.
  • an air layer is generated between the mold and the slab. When the air layer is formed, a heat transfer performance between the mold and the molten steel or the slab is reduced to generate a solidification retarded phenomenon, thereby generating break out and a crack in the slab.
  • the mold is inclined by decreasing a lower width of the mold to be less than an upper width of the mold. That is, a solidification contraction rate of a long side of the slab is compensated by inclining a short side part of the mold to decrease a lower width of the long side part in comparison with an upper width of the long side part, and a solidification contraction rate of a short side of the slab is compensated by inclining a side surface of the short side contacting the long side part of the mold to decrease a lower width of the short side in comparison with an upper width of the short side.
  • one pair of long side parts are coupled by adjusting an inclination of the short side to compensate the solidification contraction rate of the long side of the slab as described above.
  • the short side is manufactured to have a width gradually decreasing from an upper portion to a lower portion thereof by inclining the side surface of the short side contacting the long side part to compensate a solidification contraction rate in a short side direction of the slab.
  • the solidification contraction rate of the long side of the slab may be adjusted by adjusting or changing the entire inclination of the short side part when the long side part and the short side part are coupled.
  • the inclination of the side surface of the short side part may not be changed.
  • the solidification contraction rate of the long side of the slab is compensated by adjusting an installation inclination of the short side part or providing multi-taper to one short side part so that tapered amounts of upper and lower portions are differentiated.
  • a compensation degree of the solidification contraction rate of in the short side direction of the slab is typically less than that of the long side, and the same amount is compensated instead of adjusting the compensation degree for each of upper and lower portions.
  • the installation inclination of the short side part of the mold of the related art is larger to increase the compensation amount for the solidification contraction rate in the short side direction of the slab.
  • wear between the short side of the slab and the short side part of the mold is generated to reduce a lifespan of the mold and degrade a quality of the slab.
  • the present disclosure provides a mold capable of improving a lifespan thereof and suppressing wear with a slab.
  • the present disclosure also provides a mold capable of compensating a solidification contraction rate of a solidification shell.
  • the mold in accordance with the exemplary embodiments may suppress or prevent the surface defect and the break out caused by the contraction of the solidification shell in comparison with the related art. That is, the mold in accordance with the exemplary embodiments may have the improved compensation rate with respect to the contraction of the solidification shell in comparison with the related art. Particularly, the mold in accordance with the exemplary embodiments may have the improved compensation rate with respect to the contraction in the short side of the solidification shell in comparison with the related art.
  • the generation of the gap between the inner surface of the mold and the solidification shell may be suppressed or prevented to thereby suppress or prevent the solidification retarded phenomenon.
  • the contraction compensation rate in the short side direction of the solidification shell may improve.
  • the installation inclination of the short side part is further increased to improve the contraction compensation rate in the short side direction of the solidification shell.
  • wear between the short side part of the mold and the short side of the slab may be generated to reduce the lifespan of the mold and degrade the quality of the slab.
  • the contraction compensation rate in the short side direction of the solidification shell may improve to suppress or prevent the damage on the mold caused by the wear.
  • FIG 1 is a view illustrating a main portion of a general continuous casting apparatus.
  • FIG 2 is a three-dimensional view illustrating a mold in accordance with an exemplary embodiment.
  • FIG 3 is a front view for explaining a state in which one pair of short side parts have a spaced distance gradually decreasing in a downward direction in the mold in accordance with an exemplary embodiment.
  • FIG 4 is a front view for explaining an inclined shape of a side surface of a short side part contacting a long side part in the mold in accordance with an exemplary embodiment.
  • FIG 5 is a three-dimensional view that is viewed in an inner surface direction in the short side part in accordance with an exemplary embodiment.
  • (b) of FIG 5 is a front view that is viewed in the inner surface direction in the short side part in accordance with an exemplary embodiment.
  • (c) of FIG 5 is a view that is viewed in a side surface direction in the short side part in accordance with an exemplary embodiment.
  • a, b, and c of (d) of FIG 5 are top views at positions a, b, and c in a vertical direction (a height direction or a Z-axis direction) of (c) of FIG 5 .
  • FIG 6 is a view for explaining a solidification shell (refer to (a) of FIG 6 ) disposed at an upper portion and a solidification shell (refer to (b) of FIG 6 ) disposed at a lower portion in the mold in accordance with an exemplary embodiment.
  • FIG 7 is a view for explaining a shape of a convex member, a width of the short side part, and a width of the convex member in the short side part in accordance with an exemplary embodiment.
  • FIG 8 is a view for explaining an extension length of the inner surface of the short side part in the short side part in accordance with an exemplary embodiment.
  • the continuous casting apparatus includes: a ladle 10 storing molten steel refined in a steel making process; a tundish 20 receiving the molten steel through an injection nozzle connected to the ladle 10 and temporarily storing the molten steel; a mold 300 receiving the molten steel stored in the tundish 20 and initially solidifying the molten steel into a predetermined shape; and a submerged nozzle 22 (hereinafter, referred to as a nozzle) supplying the molten steel of the tundish 20 to the mold 300.
  • a submerged nozzle 22 hereinafter, referred to as a nozzle
  • the continuous casting apparatus includes a cooling bed 40 including a plurality of segments 50, which are consecutively arranged, for cooling a non-solidified slab 1, which is drawn from the mold 300, and performing a series of molding processes.
  • the mold 300 receives the molten steel from the tundish 20 and initially solidifies the molten steel into a predetermined shape.
  • the mold 300 in accordance with the present invention includes: a body having an inner space; and a convex member 322 protruding in a direction from an inner surface of the body to the inner space and having a protruding length from the inner surface to the inner surface, which gradually decreases in an inner space direction.
  • the body in accordance with an exemplary embodiment includes: one pair of long side parts 310 each extending in one direction and spaced apart from each other in a direction crossing or perpendicular to the extension direction; and one pair of short side parts 320 extending in a direction crossing or perpendicular to the long side parts 310, respectively, and spaced apart from each other in a direction crossing or perpendicular to the extension direction.
  • each of the one pair of short side parts 320 in accordance with an exemplary embodiment includes a convex member 322 protruding in the inner space direction and having a protruding length gradually decreasing in a downward direction.
  • the mold 300 includes: one pair of long side parts 310 each extending in one direction and spaced apart from each other in a direction crossing or perpendicular to the extension direction; and one pair of short side parts 320 extending in a direction crossing or perpendicular to the long side parts 310, respectively, spaced apart from each other in a direction crossing or perpendicular to the extension direction, and each including the convex member 322 protruding in the inner space direction.
  • the extension direction of each of the long side parts 310 is defined as a X-axis direction
  • the extension direction of each of the short side parts 320 is defined as a Y-axis direction.
  • the spaced direction of the one pair of long side parts 310 is the Y-axis direction
  • the spaced direction of the one pair of short side parts 320 is the X-axis direction.
  • the one pair of long side parts 310 each extend in the X-axis direction and are spaced apart from each other in the Y-axis direction crossing the X-axis direction.
  • the one pair of long side parts 310 face each other in the Y-axis direction.
  • the one pair of long side parts 310 are referred to as first and second long side parts 310.
  • the one pair of short side parts 320 each extend in the Y-axis direction and are spaced apart from each other in the X-axis direction perpendicular to the Y-axis direction or the extension direction of the long side parts 310. Thus, the one pair of short side parts 320 face each other in the X-axis direction.
  • a spaced distance between the one pair of short side parts 320 may be less than an extension length of each of the long side parts 310.
  • the exemplary embodiment is not limited thereto.
  • the spaced distance between the one pair of short side parts 320 may be equal to the extension length of each of the long side parts 310.
  • the one pair of short side parts 320 are referred to as first and second short side parts 320.
  • the mold 300 is constituted as the short side parts 320 and the long side parts 310 are connected or coupled to each other.
  • the first short side part 320 has one end connected to an inner surface of the first long side part 310 and the other end connected to an inner surface of the second long side part 310 in the extension direction
  • the second short side part 320 has one end connected to the inner surface of the first long side part 310 and the other end connected to the inner surface of the second long side part 310 in the extension direction.
  • the solidification shell C When molten steel M is injected into the mold 300, solidification is firstly initiated along an inner surface of the mold 300, and thus a solidification shell C is formed along the inner surface of the mold 300. Also, the solidification shell C has a thickness gradually increasing in a downward direction and is contracted due to cooling caused by the mold 300 and cooling caused by the outside of the mold 300.
  • the solidification shell C is mainly contracted in an extension direction of the inner surface of the mold 300. That is, the solidification shell C is contracted in the extension direction of the long side part 310 and the extension direction of the short side part 320 of the mold 300.
  • the solidification shell (hereinafter, referred to as a long side solidification shell LC) formed along the long side part 310 of the mold 300 is mainly contracted in the extension direction (the X-axis direction) of the long side part 310
  • the solidification shell (hereinafter, referred to as a short side solidification shell SC) formed along the short side part 320 of the mold 300 is mainly contracted in the extension direction (the Y-axis direction) of the short side part 320.
  • the solidification shell C has a thickness gradually increasing in the downward direction, and each of the long side solidification shell LC and the short side solidification shell SC of a lower portion of the mold 300 has a thickness greater than that of an upper portion of the mold 300.
  • the long side solidification shell LC has an extension length (a length in the X-axis direction) gradually decreasing from the upper portion to the lower portion
  • the short side solidification shell SC has an extension length (a length in the Y-axis direction) gradually decreasing from the upper portion to the lower portion.
  • each of the long side solidification shell LC and the short side solidification shell SC is contracted in a central direction of the extension direction thereof.
  • each of the long side solidification shell LC and the short side solidification shell SC of the lower portion has a length less than that of the upper portion.
  • the contraction of the solidification shell C generates a gap or an air layer between the inner surface of the mold 300 and the solidification shell C. Since the contraction is generated mainly in the central direction of the extension direction, the gap is mainly generated at corners of the mold 300 (refer to (b) of FIG 25 ). Thus, a heat transfer performance between the mold 300 and the molten steel M or between the mold 300 and the solidification shell C is reduced to cause a solidification retarded phenomenon and thus generate break out and a crack in the slab.
  • the mold 300 having an inner width gradually decreasing in the downward direction is generally prepared.
  • each of the first and second short side parts 320 is gradually inclined in the downward direction and becomes adjacent to a center of the extension direction (the X-axis direction) of the long side part 310 as illustrated in FIGS. 2 and 3 .
  • the first and second short side parts 320 are inclined so that a spaced distance between the first short side part 320 and the second short side part 320 gradually decreases in the downward direction.
  • a lower spaced distance SL between the first short side part 320 and the second short side part 320 is shorter than an upper spaced distance SL.
  • the above-described variation of the spaced distance between the first short side part 320 and the second short side part 320 eventually represents that a length of the long side of the slab gradually decreases in the downward direction.
  • an inclination angle thereof may be varied in accordance with a contraction rate of the long side solidification shell LC. That is, the inclination angle may be adjusted so that the spaced distance between the one pair of short side parts 320 gradually decreases in the downward direction in accordance with the contraction rate in which the extension length of the long side solidification shell LC gradually decreases in the downward direction.
  • the gap between the solidification shell C and an inner wall of the mold, more particularly between the short side part 320 and both ends of the long side solidification shell LC may be prevented or suppressed due to the one pair of short side parts 320 having the spaced distance gradually decreasing in the downward direction.
  • the feature in which the one pair of short side parts 320 are disposed so that the spaced distance therebetween gradually decreases in the downward direction may represent that contraction in the direction of the long side of the solidification shell C is compensated.
  • a surface defect and break out in accordance with solidification contraction of the long side solidification shell LC may be prevented or suppressed.
  • each of the first and second short side parts 320 has an extension length SW gradually decreasing in the downward direction.
  • each of the first and second short side parts 320 has the extension length (an extension length in the Y-axis direction) gradually decreasing in the downward direction.
  • the length in the Y-axis direction of the short side part 320 is referred to as a width SW of the short side part.
  • the width SW gradually decreases in the downward direction.
  • each of the first and second short side parts 320 has the lower width SW less than the upper width SW.
  • the spaced distance between the first and second sides 310 gradually decreases in the downward direction.
  • each of the first and second short side parts 320 has a length in the Y-axis direction, i.e., the width SW, in the downward direction.
  • the spaced distance between the long side parts 310 disposed to contact the short side parts gradually decreases in the downward direction to suppress generation of the surface defect and the break out caused by the contraction of the short side solidification shell SC.
  • the both side surfaces of the short side part 320 are inclined to be gradually close to each other in the downward direction, and the spaced distance between the first and second long side parts 310 gradually decreases in the downward direction.
  • the mold 300 and the solidification shell C more particularly, generation of the gap between the both ends of the short side solidification shell SC and the long side part 310 is prevented or suppressed.
  • the feature in which the both side surfaces of the short side part 320 are inclined or the spaced distance between the first and second long side parts 310 gradually decreases in the downward direction may represent compensation for the contraction in the short side direction of the solidification shell C.
  • the generation of the surface defect and the break out caused by the solidification contraction of the short side solidification shell SC is suppressed.
  • the compensation for the contraction in the short side direction of the solidification shell C or the slab may be adjusted by adjusting the inclination so that the spaced distance between the first and second short side parts 320 gradually decreases in the downward direction.
  • the inclination of each of the both side surfaces of the short side part 320 may be determined when manufactured and may not be varied when coupled with the long side part 310. Also, since the solidification contraction rate is varied depending on the kind of steel and operation conditions, the side surface of the short side part 320 may not have a sufficiently large inclination. This may represent that the inclination of each of the both side surfaces of the short side part 320 is not large enough to sufficiently compensate the solidification contraction rate in the short side direction of the solidification shell C.
  • a decrease rate of the gradually decreasing spaced distance between the first and second long side parts 310 in the downward direction may not be coincided to or synchronized with the contraction rate of the short side solidification shell SC, and a difference therebetween may be great.
  • the mold 300 may not sufficiently compensate the contraction in the short side direction of the solidification shell C to still generate the gap as illustrated in (b) of FIG 25 .
  • the mold 300 capable of preventing or further suppressing generation of the gap between the inner surface of the mold 300 and the solidification shell C therein is provided.
  • the mold 300 allowing the inner surface of the mold 300 and the solidification shell C to smoothly contact each other without the generation of the gap or the spaced distance therebetween.
  • the inner surface of the short side part 320 of the mold 300 has a protruding or convex shape toward the inner space of the mold 300, and an upper portion of the inner surface protrudes further than a lower portion thereof.
  • the short side part 320 in accordance with an exemplary embodiment will be described in more detail.
  • a shape of the short side part 320 in the width direction, i.e., the Y-axis direction, will be described.
  • the short side part 320 has one surface of both surfaces in the X-axis direction, which is exposed to the outside of the mold 300, and the other surface exposed to the inner space of the mold 300 to directly contact the molten steel M or the solidification shell C.
  • the inner surface of the short side part 320 in accordance with an exemplary embodiment may have an upward inclined shape in a direction from both edges in the width direction to the center, i.e., a convex shape of which the inclination has a curvature.
  • the short side part 320 will be described to include: a short side member 321 extending in the Y-axis direction so that the short side part 320 crosses or is perpendicular to the long side part 310; and a convex member 322 protruding in the direction from the inner surface of the short side member 321 to the inner space of the mold 300 or the X-axis direction and extending in the Y-axis direction that is the extension direction of the short side member 321.
  • a length of the convex member 322 in the Y-axis direction is referred to as a width PW of the convex member 322.
  • a protruding length from the short side member 321 to the inner space of the mold 300 of the convex member 322, i.e., a length in the X-axis direction is referred to as a protruding length A.
  • one surface contacts or is connected to the short side member 321, and the other surface faces the inner space of the mold 300 to contact the molten steel M or the solidification shell C.
  • the other surface is the inner surface of the convex member 322 or the short side part 320.
  • the protruding length A gradually increases from both ends to the center of the extension direction.
  • a point or an area having the maximum protruding length A may be a central point of the width direction of the convex member 322.
  • the inner surface of the convex member 322 may have an upward inclined shape from the both ends to the center of the width direction.
  • the convex member 322 may have a shape in which the protruding length A of the convex member 322 gradually decreases from the center to the both ends of the width direction, and the inner surface of the convex member is inclined downward from the center to the both ends of the width direction.
  • the convex member 322 in accordance with an exemplary embodiment may have a convex shape toward the inner space of the mold 300. Also, when the inner surface of the short side part 320 or the convex member 322 has an inclination in the width direction, and the inclination is varied in the Y-axis direction.
  • the width PW of the convex member 322 may be less than the width SW of the short side member 321 as illustrated in FIGS. 5 and 7 .
  • the center of the convex member 322 in the width direction and the center of the short side member 321 in the width direction may be concentric with each other.
  • an outer area of the both ends in the width direction of the convex member 322 may be a flat surface that is the inner surface of the short side member.
  • the inner surface of the short side part 320 includes the inner surface of the convex member 322 and the inner surface of the short side member 321 corresponding to an outer side of the inner surface of the convex member 322.
  • the inner surface of the short side part 320 or the convex member 322 in accordance with an exemplary embodiment has the protruding length A that gradually increases from the both ends to the center in the Y-axis direction.
  • the upper protruding length A is greater than the lower protruding length A as illustrated (a) to (d) of FIG 5 .
  • the lower protruding length A is shorter than the upper protruding length A of the convex member 322.
  • variation of the protruding length A in the vertical direction may have a shape that continuously decreases from the upper portion to the lower portion without an area having a constant inclination (refer to (c) of FIG 5 ).
  • the exemplary embodiment is not limited thereto.
  • the variation of the protruding length A in the vertical direction gradually decreases from the upper portion to the lower portion
  • the variation of the protruding length A in the vertical direction may have a step shape in which the protruding length A is varied in a partial area in the vertical direction and is not varied in the other partial area.
  • the convex member 322 When the convex member 322 is formed on the inner surface of the short side member 321 to protrude or be convex in an inward direction of the mold 300, and the protruding length A of the convex member 322 has the upper portion greater than the lower portion and gradually decreases in the downward direction, at least a portion of the inner surface of the short side part 320, particularly the length of the upper portion, extends further than that of the related art.
  • the widths SW thereof may be equal to each other.
  • the convex member 322 protruding from the short side member 321 to the inner space of the mold 300 is formed and extends downward from the upper portion.
  • an inner surface extension length SIL of the short side part 320 on which the convex member 322 is formed is greater than an inner surface extension length SIL of the short side part 320 of the related art (refer to FIG 8 ). That is, the inner surface extension length SIL of the short side part 320 increases as many as the protruding length A of the convex member 322.
  • the inner surface extension length SIL of the short side part 320 represents a length of a path from one end E1 that is one of both ends in the Y-axis direction to the other end E2 or a path from the other end to the one end.
  • the inner surface of the short side part 320 in accordance with an exemplary embodiment has a curved shape having at least one bent portion instead of a straight line shape, and a length of a path from one end to the other end of a curve is greater than that of a path from one end to the other end of a straight line.
  • the inner surface extension length SIL of the short side part 320 increases.
  • the inner surface extension length SIL of the short side part 320 in accordance with an exemplary embodiment is greater than that of an upper portion of the inner surface of the short side part 320 of the related art.
  • the inner surface extension length SIL of the lower portion of the inner surface of the short side part 320 in accordance with an exemplary embodiment may be the same as or similar to that of a lower portion of the inner surface of the short side part 320 of the related art.
  • a difference between the inner surface extension length of the upper area and the inner surface extension length of the lower area of the short side part 320 in accordance with an exemplary embodiment is greater than that of the related art.
  • the width SW gradually decreases in the downward direction
  • the inner surface extension length SIL of the short side part directly contacting the molten steel or the solidification shell gradually decreases in the downward direction in the exemplary embodiment while only the width SW of the short side part 320 of the related art gradually decreases in the downward direction.
  • a decreasing rate in which the inner surface extension length SIL of the short side part 320 of the related art gradually decreases in the downward direction is greater than that in which the inner surface extension length SIL of the short side part 320 in accordance with an exemplary embodiment gradually decreases in the downward direction.
  • the feature of forming the short side part 320 to have the convex member 322 and forming the inner surface extension length SIL of the short side part 320 to gradually decrease in the downward direction is to additionally further compensate the solidification contraction rate of the short side direction of the solidification shell C.
  • a variation rate in which the protruding length A of the convex member 322 gradually decreases in the downward direction is adjusted in accordance with variation of the contraction rate of the solidification shell C in the vertical direction. That is, the variation rate is adjusted so that the decreasing rate in which the inner surface extension length SIL of the short side part 320 decreases as the protruding length A of the convex member 322 gradually decreases in the downward direction is equal to, synchronized with, or corresponded to the contraction rate in which the length in the Y-axis direction of the short side solidification shell SC gradually decreases in the downward direction as the short side solidification shell SC is contracted.
  • the variation of the protruding length A of the convex member 322 may be obtained through a plurality of experiments according to the kind of steel, a casting speed, or casting equipment.
  • the contraction rate of the short side direction of the solidification shell C is compensated only through variation of the width SW of the short side part 320. That is, the contraction in the short side direction of the solidification shell C is compensated as the both side surfaces of the short side part 320 is gradually close to each other in the downward direction.
  • the inclination of the side surface of the short side part 320 is determined when the short side part 320 is manufactured, and when the inclination is large, a limitation in operation may occur. Thus, compensation for the contraction in the short side direction of the solidification shell C is limited.
  • a contraction compensation rate of the short side direction of the solidification shell C may improve further than that of the related art by providing the short side part 320 including the convex member 322 to protrude toward the inner space of the mold 300.
  • the generation of the gap between the short side solidification shell SC and the long side part 310 may be prevented or suppressed more than the related art due to the contraction in the short side direction of the solidification shell C or the contraction of the short side solidification shell SC.
  • the generation of the surface crack and the break out caused by the contraction of the solidification shell C may be suppressed or prevented.
  • FIG 9 is a three-dimensional view that is viewed in an inner surface direction in a short side part in accordance with a modified example of an exemplary embodiment.
  • (b) of FIG 9 is a front view that is viewed in the inner surface direction in the short side part in accordance with the modified example of the exemplary embodiment.
  • (c) of FIG 9 is a view that is viewed in a side surface direction of the short side part in the short side part in accordance with the modified example of the exemplary embodiment.
  • a, b, and c of (d) of FIG 9 are top views at positions a, b, and c in the vertical direction (the height direction or the Z-axis direction) of (c) of FIG 9 .
  • FIG 10 is a three-dimensional view that is viewed in an inner surface direction in a short side part in accordance with another modified example of the exemplary embodiment.
  • (b) of FIG 10 is a front view that is viewed in the inner surface direction in the short side part in accordance with the another modified example of the exemplary embodiment.
  • (c) of FIG 10 is a view that is viewed in a side surface direction of the short side part in the short side part in accordance with the another modified example of the exemplary embodiment.
  • a, b, and c of (d) of FIG 10 are top views at positions a, b, and c in the vertical direction (the height direction or the Z-axis direction) of (c) of FIG. 10 .
  • FIG 11 is a three-dimensional view that is viewed in an inner surface direction in a short side part in accordance with another exemplary embodiment.
  • (b) of FIG 11 is a front view that is viewed in the inner surface direction in the short side part in accordance with the another exemplary embodiment.
  • (c) of FIG 11 is a view that is viewed in a side surface direction of the short side part in the short side part in accordance with the another exemplary embodiment.
  • a, b, and c of (d) of FIG 11 are top views at positions a, b, and c in the vertical direction (the height direction or the Z-axis direction) of (c) of FIG 11 .
  • FIG 12 is a three-dimensional view that is viewed in an inner surface direction in a short side part in accordance with a modified example of the another exemplary embodiment.
  • (b) of FIG 12 is a front view that is viewed in the inner surface direction in the short side part in accordance with the modified example of the another exemplary embodiment.
  • (c) of FIG 12 is a view that is viewed in a side surface direction of the short side part in the short side part in accordance with the modified example of the another exemplary embodiment.
  • a, b, and c of (d) of FIG 12 are top views at positions a, b, and c in the vertical direction (the height direction or the Z-axis direction) of (c) of FIG 12 .
  • FIG 13 is a three-dimensional view that is viewed in an inner surface direction in a short side part in accordance with another modified example of the another exemplary embodiment.
  • (b) of FIG 13 is a front view that is viewed in the inner surface direction in the short side part in accordance with the another modified example of the another exemplary embodiment.
  • (c) of FIG 13 is a view that is viewed in a side surface direction of the short side part in the short side part in accordance with the another modified example of the another exemplary embodiment.
  • a, b, and c of (d) of FIG 13 are top views at positions a, b, and c in the vertical direction (the height direction or the Z-axis direction) of (c) of FIG 13 .
  • the convex member 322 in accordance with exemplary embodiments has a protruding length A that gradually decreases in the downward direction. Also, a vertical extension length H 2 the convex member 322 may be equal to or less than a vertical extension direction H 1 of the short side member 321. Also, a width PW of the convex member 322 may not be varied in the vertical direction or gradually decrease in the downward direction.
  • the vertical extension length H 2 of the convex member 322 in accordance with an exemplary embodiment may be shorter than the vertical extension length H 1 of the short side member 321, and a height of the lower end of the convex member 322 may be higher than that of the lower end of the short side member 321.
  • an area corresponding to the lower side of the convex member 322 in the inner surface of the short side member 321 is an area on which the convex member is not formed, the inner surface of the short side part 320 contacting the molten steel or the solidification shell has a flat shape.
  • the convex member 322 has the same upper height as the short side member 321.
  • the convex member 322 when a lowermost end of the short side member 321 of the short side part 320 is 0, and an uppermost end thereof is 1, the convex member 322 is formed from a 0.1 point in the vertical direction of the short side member 321, and a flat shape is formed at an area below the 0.1 point instead of the convex member 322.
  • the convex member 322 is formed in the upper area from a 0.5 point of the vertical direction of the short side member 321, and a flat shape is formed in the lower area from the 0.5 point.
  • the vertical extension length H 2 of the convex member 322 is less than 0.5 times of the vertical extension length H 1 of the short side member 321.
  • the convex member 322 in accordance with the exemplary embodiments has the constant width PW. That is, positions of the both ends (one end and the other end) in the width direction of the convex member 322 may be equal to each other in accordance with the height thereof.
  • a line connecting one end of the convex member 322 continuously formed in the height direction of the convex member 322 and the other end of the convex member 322 continuously formed in the height direction of the convex member 322 is defined as a 'boundary line DL'.
  • the boundary line DL may represent a line at which the inner surface of the short side member 321 meets an outermost side of the convex member 322.
  • the convex member 322 in accordance with the exemplary embodiments may have the boundary line DL that is a straight line without a curvature. This may represent that the width decreases with a constant rate when the width PW of the convex member 322 gradually decreases in the downward direction.
  • the entire shape of the convex member 322 formed on the inner surface of the short side member 321 may have a rectangular shape having no variation in width or area (refer to FIGS. 5 to 10 ).
  • each of the variation rate of the protruding length A of the convex member 322 in the vertical direction and the vertical extension length H 2 of the convex member 322 is adjusted to be equal to, synchronized with, or corresponded to the contraction rate in the Y-axis direction, which gradually varied less in the downward direction as the short side solidification shell SC is contracted.
  • the protruding length A of the convex member 322 gradually decreases in the downward direction, but the width PW thereof is constant in the vertical direction instead of being varied.
  • the width PW of the convex member 322 may gradually decreases in the downward direction like the another embodiment illustrated in FIGS. 11 to 13 . That is, the protruding length A of the convex member 322 in accordance with the another embodiment gradually decreases in the downward direction and the width PW thereof also gradually decreases in the downward direction.
  • the area on which the convex member 322 is not formed in the inner surface of the short side member 321, i.e., the lower area of the short side member 321, may have a flat shape.
  • the convex member 322 in accordance with the another exemplary embodiments has the constant width PW that gradually decreases in the downward direction.
  • PW the width direction of the convex member 322
  • positions of the both ends are gradually close to the center of the short side member 321 in the downward direction.
  • the positions of the both ends (one end and the other end) in the width direction may be different from each other in accordance with the height thereof.
  • a line connecting one end of the convex member 322 continuously formed in the height direction of the convex member 322 and the other end of the convex member 322 continuously formed in the height direction of the convex member 322 is defined as a 'boundary line DL'
  • a shape formed by the boundary line DL may be a reverse triangular shape (refer to FIGS. 11 to 13 ) or a reverse trapezoidal shape (refer to (c) of FIG 11 ).
  • the convex member 322 in accordance with the another exemplary embodiment may have the boundary lien that is a straight line without a curvature.
  • the entire shape of the convex member 322 may have a reverse triangular shape or a reverse trapezoidal shape having a width or an area that gradually decreases in the downward direction.
  • each of the vertical extension length of the convex member 322 and the variation rate of the protruding length of the convex member 322 in the vertical direction is adjusted to be equal to, synchronized with, or corresponded to the contraction rate in which the length in the Y-axis direction of the short side solidification shell SC gradually decreases less in the downward direction as the short side solidification shell SC is contracted.
  • the boundary line LD connecting one end of the convex member 322 continuously formed in the height direction of the convex member 322 and the other end of the convex member 322 continuously formed in the height direction of the convex member 322 is the straight line without a curvature.
  • the boundary line may have a curvature like the yet another embodiment illustrated in FIGS. 14 to 16 .
  • the boundary line DL of the convex member 322 in accordance with the yet another embodiment may have a shape protruding to the outside of the convex member 322 or a shape having a positive curvature.
  • the width PW of the convex member 322 gradually decreases in the downward direction, and the decreasing rate is not constant.
  • the vertical extension length H 2 of the convex member 322 is less than the vertical extension length H 1 of the short side member 321.
  • the vertical extension length H 2 of the convex member 322 is equal to the vertical extension length H 1 of the short side member 321.
  • boundary line DL of the convex member 322 in accordance with the yet another embodiment may have an approximately triangular shape that protrudes to the outside of the convex member 322 or has a positive curvature.
  • the boundary line connecting one end of the convex member 322 continuously formed in the height direction of the convex member 322 and the other end of the convex member 322 continuously formed in the height direction of the convex member 322 has a shape protruding to the outside of the convex member 322 or a shape having a positive curvature.
  • the yet another exemplary embodiment is not limited thereto.
  • the boundary line DL of the convex member may have a shape concave inward the convex member 322 or a shape having a negative curvature like the still another exemplary embodiment illustrated in FIGS. 17 to 19 .
  • the vertical extension length H 2 of the convex member 322 is less than the vertical extension length H 1 of the short side member 321.
  • the vertical extension length H 2 of the convex member 322 is equal to the vertical extension length H 1 of the short side member 321.
  • the convex member 322 in accordance with the exemplary embodiment to the still another exemplary embodiment has the width PW less than that of the short side member 321.
  • the exemplary embodiments are not limited thereto.
  • the width PW of the convex member 322 may correspond to or be equal to the width SW of the short side member 321 like a yet still another exemplary embodiment in FIG 20 .
  • the width PW of the convex member 322 in the vertical direction is not the same as the above-described exemplary embodiment and varied along the variation of the width SW of the short side member 321. That is, the width PW of the convex member 322 may decrease to be equal to or synchronized with the variation rate of the width SW of the short side member 321 gradually decreasing in the downward direction.
  • the inner surface extension length SIL of the short side part 320 gradually decreases in the downward direction.
  • FIG 21 is a three-dimensional view illustrating a mold having a convex member disposed on each of a long side part and a short side part in accordance with a still even yet another exemplary embodiment.
  • FIG 22 is a three-dimensional view illustrating a mold having chamfered corners in accordance with a still even further exemplary embodiment.
  • FIG 23 is a three-dimensional view illustrating a short side part of the mold in accordance with a still even further exemplary embodiment.
  • the short side part 320 of the mold is configured to include the convex member 322. That is, the inner surface of the short side part 320 has the shape protruding or convex to the inside of the mold 300.
  • the long side part 310 of the mold 300 may include a convex member 312. That is, as illustrated in the still even yet another exemplary embodiment in FIG 21 , the long side part 310 includes a long side member 311 extending in the X-axis direction to cross or be perpendicular to the short side part 320 and a convex member 312 protruding in the Y-axis direction or the inner space direction of the mold 300 from the inner surface of the long side member 311 and extending in the X-axis direction that is an extension direction of the long side member 311.
  • features of the exemplary embodiment to the yet still another exemplary embodiment described in FIGS. 5 , and 9 to 20 may be applied to the convex member 312 of the long side part 310.
  • each of the long side part 310 and the short side part 320 includes the convex member 312 and 322 in the still even yet another exemplary embodiment, the still even yet another exemplary embodiment is not limited thereto.
  • the long side part 310 may include the convex member 312 (not shown).
  • the feature in which the inner surface of the short side part 320 protrudes or is convex to the inner space of the mold 300 may be applied to the chamfered mold as in the still even further exemplary embodiment in FIG 22 .
  • the mold 300 in accordance with the still even further exemplary embodiment includes: one pair of long side parts 310 each extending in one direction and spaced apart from each other in a direction crossing or perpendicular to an extension direction thereof; and one pair of short side parts 320 extending in a direction crossing or perpendicular to the long side parts, respectively, and spaced apart from each other in a direction crossing or perpendicular to the extension direction thereof.
  • the short side part 320 includes a protruding member 323 protruding to the inside of the mold 300. That is, the short side part 320 in accordance with the still even further exemplary embodiment includes: a short side member 321 extending in the Y-axis direction; one pair of protruding members 323 each extending in a direction from an inner surface of each of both edges in the Y-axis direction of the short side member 321 to the inner space of the mold 300; and a convex member 322 protruding in the X-axis direction or a direction from an inner surface of the short side member 321 to the inner space of the mold 300 between the one pair of protruding members 323.
  • the protruding member 323 may provide a chamfered shape to the mold 300 and be referred to as a chamfered protruding member 323.
  • the convex member 322 may be additionally provided to the long side part 310 or provided only to the long side part 310.
  • the mold 300 has the approximately rectangular shape in which the long side part 310 and the short side part 320 have different lengths from each other.
  • the exemplary embodiments are not limited thereto.
  • the mold 300 may have a square shape.
  • the short side part 320 includes the short side member 321 and the convex member 322, which are separated, or the long side part 310 includes a long side member 311 and the convex member 312, which are separated.
  • the short side member 321 and the convex member 322 may be integrated with each other, and the long side member 311 and the convex member 312 may be integrated with each other.
  • the mold 300 in accordance with the exemplary embodiments may suppress or prevent the surface defect and the break out caused by the contraction of the solidification shell C in comparison with the related art. That is, the mold 300 in accordance with the exemplary embodiments may have the improved compensation rate with respect to the contraction of the solidification shell C in comparison with the related art. Particularly, the mold 300 in accordance with the exemplary embodiments has the improved compensation rate with respect to the contraction in the short side direction of the solidification shell C in comparison with the related art.
  • the generation of the gap between the inner surface of the mold 300 and the solidification shell C may be suppressed or prevented to thereby suppress or prevent the solidification retarded phenomenon.
  • the contraction compensation rate in the short side direction of the solidification shell C may improve.
  • an installation inclination of the short side part 320 is further increased to improve the contraction compensation rate in the short side direction of the solidification shell C.
  • wear between the short side part 320 of the mold and a short side of the slab may be generated to reduce a lifespan of the mold 300 and degrade a quality of the slab.
  • the contraction compensation rate in the short side direction of the solidification shell C may improve to suppress or prevent damage on the mold 300 caused by the wear.
  • the mold in accordance with the exemplary embodiments may suppress or prevent the surface defect and the break out caused by the contraction of the solidification shell in comparison with the related art. That is, the mold in accordance with the exemplary embodiments may have the improved compensation rate with respect to the contraction of the solidification shell in comparison with the related art. Particularly, the mold in accordance with the exemplary embodiments may have the improved compensation rate with respect to the contraction in the short side of the solidification shell in comparison with the related art.
  • the generation of the gap between the inner surface of the mold and the solidification shell may be suppressed or prevented to thereby suppress or prevent the solidification retarded phenomenon.

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

Claims (10)

  1. Moule (300) qui solidifie un acier fondu injecté dans un espace intérieur de celui-ci, comprenant :
    un corps comportant l'espace intérieur ; et
    un organe convexe (322) qui fait saillie dans une direction allant d'une surface intérieure du corps à l'espace intérieur, dans lequel une longueur de saillie (A) de l'organe convexe (322) dans une direction allant de la surface intérieure à l'espace intérieur diminue progressivement,
    dans lequel le corps comprend :
    une paire d'organes à côté long (311) s'étendant chacun dans une direction et installés pour se faire face dans une direction croisant la direction étendue ; et
    une paire d'organes à côté court (321) s'étendant pour croiser les organes à côté long (311), respectivement, et installés pour se faire face, scellant ainsi une portion entre ladite paire d'organes à côté long (311),
    l'organe convexe (322) est formé en saillie à partir des organes à côté court (321) vers l'espace intérieur du moule (300) et s'étend vers le bas à partir d'une portion supérieure,
    dans lequel la portion supérieure de l'organe convexe (322) est positionnée à la même hauteur qu'une portion supérieure du corps, et
    dans lequel la longueur d'extension verticale (H2) de l'organe convexe (322) est inférieure à 0,5 fois la longueur d'extension verticale (H1) du corps, et un taux de variation est ajusté de telle sorte qu'un taux décroissant auquel la longueur d'extension de surface intérieure (SIL) d'une partie à côté court (320) diminue à mesure que la longueur de saillie (A) de l'organe convexe (322) diminue progressivement dans une direction vers le bas soit égal, synchronisé ou corresponde à un taux de contraction auquel une longueur dans une direction d'axe Y d'une coquille de solidification à côté court (SC) diminue progressivement dans la direction vers le bas à mesure que la coquille de solidification à côté court (SC) est contractée.
  2. Moule (300) selon la revendication 1, dans lequel l'organe convexe (322) a la même largeur (PW) dans une direction verticale.
  3. Moule (300) selon la revendication 1, dans lequel l'organe convexe (322) a une largeur (PW) qui diminue progressivement dans une direction vers le bas.
  4. Moule (300) selon la revendication 1, dans lequel l'organe convexe (322) a une largeur (PW) inférieure à celle du corps.
  5. Moule (300) selon la revendication 1, dans lequel l'organe convexe (322) a la même largeur (PW) que celle du corps.
  6. Moule (300) selon la revendication 3, dans lequel la largeur (PW) de l'organe convexe (322) diminue progressivement dans la direction vers le bas avec un taux constant.
  7. Moule (300) selon la revendication 6, dans lequel une ligne de délimitation (DL) entre la surface intérieure du corps et l'organe convexe (322) est une ligne droite.
  8. Moule (300) selon la revendication 3, dans lequel la largeur (PW) de l'organe convexe (322) diminue progressivement dans la direction vers le bas avec un taux non constant.
  9. Moule (300) selon la revendication 8, dans lequel une ligne de délimitation (DL) entre la surface intérieure du corps et l'organe convexe (322) est une courbe.
  10. Moule (300) selon la revendication 9, dans lequel ladite paire d'organes à côté court (321) est inclinée de sorte qu'une distance espacée entre ladite paire d'organes à côté court (321) diminue progressivement dans la direction vers le bas.
EP19804126.1A 2018-05-14 2019-05-13 Moule Active EP3795273B1 (fr)

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KR1020180055134A KR102074364B1 (ko) 2018-05-14 2018-05-14 주형
PCT/KR2019/005738 WO2019221469A1 (fr) 2018-05-14 2019-05-13 Moule

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KR102441319B1 (ko) * 2020-12-17 2022-09-08 주식회사 포스코 주형
CN113857444A (zh) * 2021-10-10 2021-12-31 秦皇岛瀚丰长白结晶器有限责任公司 一种适合生产普碳钢的高拉速结晶器
DE102022207234A1 (de) * 2022-07-15 2024-01-18 Sms Group Gmbh Kupferplatte mit verbesserter Oberflächengeometrie
CN115815545A (zh) * 2022-10-27 2023-03-21 东北大学 一种凸型弧面连铸结晶器窄面铜板及其使用方法

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CN112118924A (zh) 2020-12-22
KR20190130430A (ko) 2019-11-22
EP3795273A4 (fr) 2021-03-24
JP2021521016A (ja) 2021-08-26
WO2019221469A1 (fr) 2019-11-21
KR102074364B1 (ko) 2020-02-06
JP7037670B2 (ja) 2022-03-16
EP3795273A1 (fr) 2021-03-24
CN112118924B (zh) 2023-01-31
EP3795273C0 (fr) 2023-08-02

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