WO2020096391A1 - Dispositif de réduction de compression - Google Patents

Dispositif de réduction de compression Download PDF

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Publication number
WO2020096391A1
WO2020096391A1 PCT/KR2019/015105 KR2019015105W WO2020096391A1 WO 2020096391 A1 WO2020096391 A1 WO 2020096391A1 KR 2019015105 W KR2019015105 W KR 2019015105W WO 2020096391 A1 WO2020096391 A1 WO 2020096391A1
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WO
WIPO (PCT)
Prior art keywords
cast piece
convex
rolls
roll
cast
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PCT/KR2019/015105
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English (en)
Korean (ko)
Inventor
최정윤
이형준
김성연
Original Assignee
주식회사 포스코
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Publication of WO2020096391A1 publication Critical patent/WO2020096391A1/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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use

Definitions

  • the present invention relates to a pressing device, and more particularly, to a pressing device capable of suppressing or preventing the occurrence of defects in the inside of the cast iron.
  • a continuous casting device is a device that injects molten steel into a mold and continuously draws molten steel reacted in the mold downward to produce cast pieces of various shapes such as slabs, blooms, billets, beam blanks, and the like.
  • a tundish that temporarily receives and receives molten steel from a ladle, and a mold that initially injects molten steel through an immersion nozzle from the tundish and initially solidifies into a constant shape through primary cooling ( mold) and a cooling zone that performs a series of molding operations while completing the solidification by secondary cooling the cast steel drawn from the mold.
  • the cast piece that has passed through the cooling zone is cut to a predetermined length, and then transferred to a collecting point.
  • Solidification proceeds from the surface toward the center, and unsolidified molten steel remains inside the casting until solidification is completed.
  • solidification shrinkage occurs, and voids and segregation may be formed inside the casting. have.
  • the cast is pressed with a pressing device equipped with a plurality of rolling rolls to suppress the occurrence of central segregation of the cast by reducing the residual voids.
  • the cast steel in rolling down the cast steel, regardless of a decrease in the amount of uncoagulated molten steel or an increase in strength of the cast steel, the cast steel was rolled using a flat roll having a constant diameter in the width direction. In this case, the unsolidified molten steel is not sufficiently depressed in the end of the solidification period with high strength. In other words, at the end of solidification, the pressing force applied from the flat roll is insufficient to suppress the occurrence of voids and segregation, and there is a problem that the quality of the cast steel is deteriorated.
  • Patent Document 1 Korean Patent Publication 2012-0057315
  • the present invention provides a pressing device capable of suppressing or preventing the occurrence of segregation and shrinkage pores inside the cast iron.
  • the present invention provides a pressing device capable of increasing the pressing force applied to the cast piece.
  • the pressing device each of which is formed to extend in the width direction of the cast piece, is provided with a protruding portion protruding outward on the outer circumferential surface, a plurality of convex rolls arranged in a longitudinal direction crossing the width direction of the cast piece Including, the protrusions of each of the plurality of convex rolls have different widths, and the plurality of convex rolls are arranged such that the width of the protrusions narrows toward the direction in which the solid phase rate of the cast piece increases.
  • the width of each projection of each of the plurality of convex rolls is equal to or greater than the width of the unsolidified portion of the cast piece on which each convex roll is disposed.
  • Each of the plurality of convex rolls is provided such that the center in the width direction of the protrusion is on a straight line with the center in the width direction of the non-solidified portion of the cast piece.
  • the plurality of convex rolls are installed in sections with a solid phase ratio of more than 0.6 and less than 1.0.
  • the plurality of convex rolls are installed in a section having a solid phase ratio of more than 0.6 and 0.9 or less.
  • the plurality of convex rolls are arranged in series in the extending direction of the cast piece.
  • Each is formed to extend in the width direction of the cast piece, and includes a plurality of flat rolls arranged in the longitudinal direction of the cast piece, and on either one of the upper and lower sides of the cast piece, the plurality of convex rolls extend in the direction of the cast piece In a row, the plurality of flat rolls are arranged in a row in the extending direction of the cast on the other side.
  • Each is formed to extend in the width direction of the cast piece, and includes a plurality of flat rolls arranged in the longitudinal direction of the cast piece, and arranged so that the convex roll and the flat roll are alternately repeated multiple times on each of the upper and lower sides of the cast piece. It is arranged so that the arrangement of the convex roll and the flat roll on the upper side of the cast piece and the arrangement of the convex roll and the flat roll on the lower side of the cast piece are staggered.
  • the plurality of convex rolls are disposed at the rear of the plurality of convex rolls so as to be located in a lower solid phase section than the solid phase ratio of the cast pieces, each of which is formed to extend in the width direction of the cast piece, the longitudinal direction of the cast piece It includes a plurality of flat rolls arranged in line.
  • the plurality of flat rolls are installed in sections having a solid phase ratio of 0.3 or more and 06 or less.
  • a sufficient pressing force can be transmitted to the non-solidified portion by arranging a plurality of convex rolls so that the width of the protruding portion decreases as the solid phase rate increases. Therefore, it is possible to suppress or prevent the occurrence of defects inside the cast iron, that is, shrinkage holes and segregation.
  • the pressing portion is pressed using a plurality of convex rolls having different widths, the pressing marks are formed more gently than in the prior art. Accordingly, it is possible to prevent the occurrence of surface defects, such as overlapping defects, during rolling of the cast, which is a subsequent process.
  • FIG. 1 is a view showing a casting equipment including a pressing device according to an embodiment of the present invention
  • Figure 2 is a conceptual diagram for explaining the uncoated portion of the cast
  • Figure 3 is a conceptual diagram for explaining the width of the non-solidified portion according to the solid phase rate
  • FIG. 4 is a view showing a flat roll according to an embodiment of the present invention
  • FIG. 5 is a view showing a convex roll according to an embodiment of the present invention
  • FIG. 6 is a conceptual diagram for explaining the arrangement of a plurality of convex rolls according to an embodiment of the present invention according to the increase of the solid phase rate of the cast
  • FIG. 7 is a conceptual diagram for explaining the arrangement of a plurality of flat rolls and a plurality of convex rolls according to an embodiment of the present invention according to the solid phase rate of the cast steel
  • FIG. 9 is a conceptual diagram for explaining the arrangement of the roll in the vertical direction of the cast piece in the pressing device according to the modification of the embodiment
  • 10 is a graph showing the amount of reduction by the roll located at the end and the force applied from the driving device to achieve the amount of reduction.
  • 1 is a view showing a casting equipment including a pressing device according to an embodiment of the present invention.
  • 2 is a conceptual diagram for explaining a non-coagulation part of a cast piece.
  • 3 is a conceptual diagram for explaining the width of the non-solidified portion according to the solid-phase rate.
  • 4 is a view showing a flat roll according to an embodiment of the present invention.
  • 5 is a view showing a convex roll according to an embodiment of the present invention.
  • 6 is a conceptual diagram for explaining the arrangement of a plurality of convex rolls according to an embodiment of the present invention according to an increase in the solid phase rate of a cast steel.
  • 7 is a conceptual diagram for explaining the arrangement of a plurality of flat rolls and a plurality of convex rolls according to an embodiment of the present invention according to the solid phase ratio of the cast steel.
  • 8 is a conceptual view for explaining the arrangement of the convex roll in the vertical direction of the cast steel in the rolling-down device of the embodiment of the present invention.
  • the casting facility receives the molten steel and temporarily stores it in a tundish (10) for storing and temporarily storing it, and receives the molten steel stored in the tundish (10) in an open form to initially solidify in a predetermined shape ( It includes a solidification device (primary solidification) (mold) (20), solidification (secondary solidification) while moving the cast steel (S) drawn from the mold 20 in one direction, and a solidification device (4000) for pressing it down.
  • a solidification device primary solidification
  • secondary solidification solidification
  • S cast steel drawn from the mold 20 in one direction
  • a solidification device (4000) for pressing it down.
  • the casting equipment is located in front of the immersion nozzle 30 and the solidification device 4000 for supplying molten steel of the tundish 10 to the mold 20, a cutting machine for cutting the finished solid S (not shown) Poetry).
  • the tundish 10 is a means for supplying molten steel to the mold 20, and is a shape of a container having an inner space for receiving molten steel, and the outermost outer wall is formed of an iron shell, and the inner wall of the iron shell is protected by a refractory material.
  • the mold 20 has a hollow shape having upper and lower sides open and an internal space.
  • the mold 20 has a shape in which the lower side is opened for continuous drawing of the primary solidified cast steel S therein, and the lower opening is closed by a dummy bar (not shown) before casting starts.
  • the coagulation device 4000 is located at the lower side of the mold 20 and is located in front of the guide device 4100 and the guide device 4100 for moving and cooling the cast piece S drawn from the mold 20, the cast piece And a pressing device 4200 for pressing the cast piece S while moving and cooling (S).
  • the guide device 4100 is positioned between the plurality of guide rolls 4110 and a plurality of guide rolls 4110 arranged from the lower side of the mold 20 to the front end of the pressing device 4200 and toward the cast piece S It includes an injection nozzle (not shown) for spraying coolant.
  • the plurality of guide rolls 4110 may include a plurality of drive rolls capable of self-rotating to move the cast piece S in one direction, and a plurality of rotation rolls rotatable by the force of the moving piece S.
  • the primary solidified from the mold 20 and drawn out (S) is secondary solidified by the cooling water injected while moving along the solidification device 4000.
  • the solidification of the cast iron S proceeds from the surface of the cast iron S to the inner side, whereby the center of the cast iron S is solidified at the latest.
  • the central part of the cast iron S is the center of the width direction (Y-axis direction) and the thickness direction of the cast steel S (crossing the X-axis direction) or the longitudinal direction (X-axis direction) of the cast steel S Z-axis direction) (see Fig. 2).
  • the final solidification completion point of the cast steel S becomes the center of the cast steel.
  • a rolling device 4200 is installed in front of the guide device 4100 to roll down the cast iron S, and more specifically, soft reduction.
  • the casting S is solidified and cooled while passing through the solidification device 4000, so that the liquid amount inside the casting S increases from the lower side of the mold 20 toward the direction where the cutter (not shown) is located.
  • the amount of uncoated molten steel decreases, and the amount of solid phase increases.
  • the solid state rate increases as the area of the cast piece S adjacent to the cutter (not shown) increases.
  • the solid-phase rate is a value indicating how much unsolidified molten steel is contained in the cast steel, that is, the width (Y-axis direction) length (W S ) of the cast steel (S) and the unsolidified molten steel in the cast steel (S). It can be expressed as a ratio of the width W (Y-axis direction) length W L of the non-solidified portion LA (see FIGS. 2 and 3).
  • the width W L of the non-solidified portion in the entire width direction length W S of the cast piece S is 1
  • that the solid phase ratio is 0.6 means that the width W L of the non-solidified portion is 0.4 (40%) in the entire length W S of the cast steel S (see FIG. 3 (b)).
  • having a solid phase rate of 0.9 means that the width W L of the non-solidified portion is 0.1 (10%) in the entire length W S of the cast steel S (Fig. 3 (c). ) Reference).
  • the position at which the solid phase rate is 1.0 is the position in which the width W L of the non-solidified portion LA becomes '0' in the entire width direction length W S of the cast piece S, that is, there is no liquid amount. In other words, this is the location where the solidification is completed, and is usually referred to as the solidification completion point S F (see FIG. 2).
  • the solid state rate increases as cooling or solidification progresses. That is, as the solidification completion point S F approaches, the length and thickness (the length in the Z-axis direction) of the solid portion SA increase in the width direction (the length in the Z-axis direction), and the width direction (in the Y-axis direction) of the liquid portion LA ) Length and thickness (Z-axis length) decrease.
  • the surface of the cast steel is solidified to facilitate reduction, and sufficient unsolidified molten steel exists inside.
  • the solid phase rate is 0.3 or more and 0.6 or less. In the section (0.3 to 0.6), since the temperature of the cast steel S is relatively high and the strength is low compared to the section with a solid phase ratio exceeding 0.6, it is possible to sufficiently reduce even with a small pressing force.
  • the deformation resistance of a section in which the solid phase rate exceeds 0.6 is larger than a section in which the solid phase rate is 0.3 or more and 0.6 or less. Therefore, in order to sufficiently reduce the unsolidified portion LA in a section in which the solid phase rate exceeds 0.6, a large force or a pressing force is required compared to a section in which the solid phase rate is 0.3 or more and 0.6 or less.
  • the pressing device 4200 is pressed with a relatively small pressing force in a section having a solid phase rate of 0.3 or more and 0.6 or less, and a relatively large pressing force in a section having a solid phase rate exceeding 0.6. It is configured to be pressed.
  • the pressing device 4200 is configured to increase the pressing force toward the casting direction or solidification completion point in a section where the solid phase rate exceeds 0.6.
  • the pressing device 4200 each of which is formed to extend in the width direction (Y-axis direction) of the cast piece (S) of the cast piece (S) in front of the guide roll (4110)
  • a plurality of flat rolls 4210 arranged in series in the extension direction (X-axis direction) and each of which is formed to extend in the width direction (Y-axis direction) of the cast piece S, and thus the cast piece S in front of the plurality of flat rolls 4210 It includes a plurality of convex rolls 4220 arranged in a row in the extending direction (X-axis direction).
  • the pressing device 4200 includes an injection nozzle (not shown) that is located between the plurality of flat rolls 4210 and the convex rolls 4220 to spray cooling water into the cast piece S.
  • Each of the plurality of flat rolls 4210 and the plurality of convex rolls 4220 is provided on the upper and lower sides of the cast piece S, respectively. That is, on each of the upper side and the lower side of the cast piece S, a plurality of flat rolls 4210 are arranged in a row, and a plurality of convex rolls 4220 are arranged in a row in front of the last flat roll 4210.
  • the pressing device 4200 moves the upper flat roll 4210 and the lower flat roll 4210 closer to each other, and moves the upper convex roll 4220 and the lower convex roll 4220 closer to each other, thereby being positioned therebetween. It is a device for rolling down the cast piece S.
  • a driving device (not shown) that can be moved up and down and rotated, and the upper side of the cast piece S so that the separation distance between the convex roll 4220 positioned on the upper side of the cast piece S and the convex roll 4220 located on the lower side is adjusted. It includes a driving device (not shown) that can move up and down and rotate the convex roll 4220 of.
  • the rolling-down device 4200 as described above that is, the plurality of flat rolls 4210 and the plurality of convex rolls 4220 are arranged in a section in which the solid phase ratio is 0.3 or more and less than 1.
  • a plurality of flat rolls 4210 and a plurality of convex rolls 4220 are installed in a section having a solid phase ratio of 0.3 or more and 0.9 or less. Then, the flat roll 4210 or the convex roll 4220 is disposed according to the solid phase rate.
  • the flat roll 4210 includes a roll member (hereinafter, a first roll member 4211) and a first roll member 4211 formed in the width direction (Y-axis direction) of the cast piece S It includes a rotating body (hereinafter, the first rotating body 4212) formed to protrude outward from both ends in the extending direction of).
  • a roll member hereinafter, a first roll member 4211
  • a first roll member 4211 formed in the width direction (Y-axis direction) of the cast piece S It includes a rotating body (hereinafter, the first rotating body 4212) formed to protrude outward from both ends in the extending direction of).
  • the first roll member 4211 has a flat outer peripheral surface in a direction parallel to the width direction (Y-axis direction) of the cast piece S. That is, the first roll member 4211 has a shape in which the diameter of the cast piece S does not change in the width direction (Y-axis direction). In other words, the height of the outer circumferential surface parallel to the width direction (Y-axis direction) of the cast piece S does not change or is the same as the first roll member 4211 in the width direction (Y-axis direction) of the cast piece S.
  • the length of the first roll member 4211 in the width direction (Y-axis direction) may be greater than or equal to the length of the width direction (Y-axis direction) of the cast piece S.
  • the first rotating body 4212 may be installed to protrude outwardly from one end and the other end, which are both ends in the extending direction (Y-axis direction) of the first roll member 4211.
  • a driving device (not shown) for applying a rotational driving force may be connected to the first rotating body 4212.
  • first roll member 4211 and the first rotation body 4212 are driven by rotational power applied to the first rotation body 4212, so that the first rotation body 4212 and the first roll member 4211 are formed. It is installed mutually fastened or connected so that it can rotate together.
  • the flat roll 4210 as described above is installed in a section having a solid phase ratio of 0.3 or more and 0.6 or less. More specifically, in a section in which the solid phase rate is 0.3 or more and 0.6 or less, a plurality of flat rolls 4210 are arranged in the extending direction (X-axis direction) of the cast piece S on each of the upper and lower sides of the cast piece S.
  • the unsolidified portion LA in a section having a solid phase ratio of 0.3 or more and 0.6 or less can be sufficiently reduced even with a flat roll 4210.
  • the convex roll 4220 is in the outer peripheral surface F in a direction parallel to the width direction (Y-axis direction) of the cast iron S, and some regions protrude outward. . That is, the convex roll 4220 has a different diameter in the width direction (Y-axis direction) of the cast piece S, and is a region in which a relatively large diameter area protrudes.
  • a region protruding outward from the outer circumferential surface F of the convex roll 4220 parallel to the width direction (Y-axis direction) of the cast piece S is referred to as a protrusion portion 4221a.
  • the convex roll 4220 When explaining the configuration of the convex roll 4220 in more detail, it is formed to extend in the width direction (Y axis direction) of the cast piece S, and the outer peripheral surface F parallel to the width direction (Y axis direction) of the cast piece S
  • a rotating member hereinafter referred to as a protruding portion 4221a
  • a protruding portion 4221a is formed to protrude outward from both ends in the extending direction (Y-axis direction) of the roll member (hereinafter, the second roll member 4221) and the second roll member 4221. It includes a second rotating body (4222).
  • the second roll member 4221 is a shape in which a part of the region protrudes outward on the outer peripheral surface F parallel to the width direction (Y-axis direction) of the cast piece S. That is, in the second roll member 4221, the cast steel S has a different diameter in the width direction (Y-axis direction), the diameter of the center of the width direction is larger than other areas, and the area with a relatively large diameter is a protrusion ( 4221a). In other words, the outer circumferential surface F of the second roll member 4221 includes a protrusion 4221a that protrudes further outward.
  • the width or the extended length (the length in the Y-axis direction) of the second roll member 4221 may be greater than or equal to the width (W S ) (the length in the Y-axis direction) of the cast piece S.
  • the protruding portion 4221a is provided so that the center of its width direction (Y-axis direction) and the center of the width direction (Y-axis direction) of the cast piece S coincide.
  • the width A of the protrusion (the length in the Y-axis direction) may be equal to or greater than the width W L (the length in the Y-axis direction) of the non-solidified portion LA.
  • the second rotating body 4222 may be installed to protrude outwardly from one end and the other end, which are both ends in the extending direction (Y-axis direction) of the second roll member 4221.
  • the second rotating body 4422 may be connected to a driving device that applies rotational driving force.
  • the second roll member 4221 and the second rotation body 4222 are driven by rotational power applied to the second rotation body 4222, so that the second rotation member 4422 and the second roll member 4221 are rotated. It is installed mutually fastened or connected so that it can rotate together.
  • the solid phase amount is higher than the section having a solid phase rate of 0.3 to 0.6, and the strength is high. Therefore, when the flat roll 4210 is used for pressing, the pressing force reaching the unsolidified portion is reduced. Insufficient, it is not possible to effectively lower the non-solidified portion LA.
  • the pressing force applied to the non-solidified part LA of the cast steel S compared to the flat roll 4210 is provided. Can be increased.
  • a plurality of convex rolls 4220 are installed in a section requiring a large pressing force, that is, a section having a solid phase ratio of greater than 0.6 and less than 1.0.
  • a section having a solid phase ratio of greater than 0.6 and less than 1.0 at least three convex rolls 4220 are installed on the upper and lower sides of the cast piece S, respectively.
  • the width of the unsolidified portion LA decreases as the width W L goes toward the solidification completion point S F , and in the section where the solid phase rate exceeds 0.6, the strength of the cast steel S rapidly increases as the solid phase rate increases. Increase.
  • the widths A of each of the protrusions 4221a are all different, and in a section in which the solid phase ratio is greater than 0.6 and less than 1.0, the protrusions gradually go toward the solidification completion point S F
  • a plurality of convex rolls 4220 are installed so that the width A of 4221a (the length in the Y-axis direction) is small.
  • the convex roll 4220 as described above is disposed on each of the upper and lower sides of the cast piece S, as shown in FIG. 8. That is, a plurality of convex rolls 4220 are disposed on each of the upper and lower sides of the cast iron S of a section with a solid phase ratio of greater than 0.6 and less than 1.0, and the width A of the protrusion 4221a increases toward the solidification completion point S F position. ) (The length in the Y-axis direction) is arranged to be small.
  • the protrusions 4221a of each of the plurality of convex rolls 4220 are preferably provided so that the center of the width direction (Y-axis direction) is located in line with the center of the width direction of the cast piece S.
  • the width A (the length in the Y-axis direction) of the protrusions 4221a of each of the plurality of convex rolls 4220 is the same as the width W L of the non-solidified portion LA at the position where each is disposed. It is preferred, but is not limited to this, and may be large in length.
  • the width A of the protrusion 4221a (the length in the Y-axis direction) may be larger than the width W L of the non-solidified portion LA, for example, of the non-solidified portion LA
  • the width may be adjusted so that the difference between the width W L and the width A of the protrusion 4221a is 5% or less of the width W L of the non-solidified portion LA.
  • the installation of the convex roll 4220 having a narrower width A (the length in the Y-axis direction) of the protruding portion 4221a toward the solidification completion point S F is the width A of the protruding portion 4221a ( The smaller the length in the Y-axis direction), the smaller the force applied or the area acting, and the same force exerted from the driving device has the effect of concentrating the force into the area of the cast steel S facing the protrusion 4221a. Because there is.
  • the convex roll 4220 having a narrow width (A) (length in the Y-axis direction) of the protruding portion 4221a toward the solidification completion point S F in a section in which the solid phase rate is greater than 0.6 and less than 1.0 is installed and reduced.
  • A narrow width
  • the unsolidified portion LA can be sufficiently lowered in a section where the solid phase ratio is greater than 0.6 and less than 1.0.
  • the reduction marks are formed more slowly than in the prior art. Accordingly, it is possible to prevent the occurrence of surface defects, such as overlapping defects, during rolling of the cast, which is a subsequent process.
  • the strength of the solid portion SA is stronger than that of the non-solidified portion LA and the strength of the solid portion SA is stronger in a section in which the solid phase ratio is greater than 0.6 and less than 1.0, a large pressing force is applied to the solid portion SA. In some cases, cracks may occur.
  • the width A (Y-axis length) of each of the protrusions 4221a of the plurality of convex rolls 4220 is the width W L of the non-solidified portion LA at the position where each is disposed. ), Or provided to have a predetermined length and is positioned corresponding to the non-solidified portion LA, so that a relatively small pressing force is applied to the solid portion SA compared to the non-solidified portion LA. Therefore, it is possible to suppress or prevent the occurrence of cracks in the solid phase.
  • FIG. 9 is a conceptual view for explaining the arrangement of the convex roll in the vertical direction of the cast piece in the pressing device according to the modification of the embodiment.
  • the convex roll 4220 may be disposed on the upper side of the cast piece S, and the flat roll 4210 may be disposed on the lower side. More specifically, in a section in which the solid phase ratio is greater than 0.6 and less than 1.0, a plurality of convex rolls 4220 are arranged in the extension direction of the cast piece S on the upper side of the cast piece S, and the lower side of the cast piece S A plurality of flat rolls 4210 may be arranged in the direction of extension of the cast piece (S). At this time, at least three or more convex rolls 4220 installed on the upper side of the cast piece S. In addition, a plurality of convex rolls 4220 are arranged on the upper side of the cast piece S, and the convex roll 4220 having a narrow width A of the protrusion toward the solidification completion point S F is disposed.
  • the flat roll 4210 may be disposed on the upper side of the cast piece S, and the convex roll 4220 may be disposed on the lower side.
  • the convex roll 4220 and the flat roll 4210 may be alternately arranged in the extending direction of the cast piece S on the upper and lower sides of the cast piece S, respectively. have.
  • the convex roll 4220 and the flat roll 4210 are alternately installed and repeated multiple times on the upper side of the cast piece S, and the convex roll on the lower side of the cast piece S ( 4220) and the flat roll 4210 may be alternately installed to be repeated multiple times.
  • the arrangement of the convex roll 4220 and the flat roll 4210 on the upper side of the cast piece S, and the arrangement of the convex roll 4220 and the flat roll 4210 on the lower side of the cast piece S may be arranged to be staggered.
  • at least three or more convex rolls 4220 are installed on the upper and lower sides of the cast iron.
  • the plurality of convex rolls 4220 are disposed on each of the upper and lower sides of the cast piece S, and are arranged in such a manner that the width A of the protruding portion 4221a becomes narrower toward the solidification completion point S F.
  • the width A of the protrusions 4221a is narrowed in the extending direction of the cast steel S on the upper or lower surface of the cast steel S,
  • Table 1 shows whether segregation occurred in the cast slab pressed by the method according to Comparative Examples and Examples.
  • a plurality of flat rolls 4210 are installed on each of the upper and lower sides of the cast piece in a section with a solid phase rate of 0.3 or more and 0.6 or less, and the rolling phase is over 0.6,
  • a plurality of convex rolls 4220 are installed on each of the upper and lower sides of the cast, and are pressed.
  • the second comparative example is a case where the width A of the protrusions 4221a of the plurality of convex rolls 4220 in a section with a solid phase ratio of more than 0.6 and 0.9 or less is the same.
  • the embodiment is a case in which a plurality of convex rolls 4220 are disposed in a section with a solid phase ratio of more than 0.6 and 0.9 or less, so that the width A of the protrusion 4221a decreases toward the solidification completion point S F.
  • the amount of rolling is a difference value between the thickness of the cast steel S before rolling down and the thickness of the casting S after rolling down.
  • the rolling reduction amount was 16 mm, and contraction holes and segregation were clearly seen.
  • the rolling reduction amount was 25.5 mm, which was increased compared to the first comparative example, and shrinkage holes and segregation occurred, but decreased compared to the first comparative example.
  • the rolling reduction amount was 31 mm. It can be seen that the increase was compared to the first and second comparative examples, and it was confirmed that the occurrence of shrinkage cavities and segregation was significantly improved compared to the first and second comparative examples.
  • FIG. 10 is a graph showing the amount of reduction by the roll located at the end of the test described in Table 1 and the force applied from the driving device to achieve the amount of reduction.
  • the last positioned roll is a roll installed at a position with a solid phase ratio of 0.9, which is a flat roll in the first comparative example and a convex roll in the second comparative example and the embodiment.
  • the force applied from the driving device was expressed as a ratio of the performance to the force capability that the driving device can exert maximum.
  • the maximum force was required even with a small rolling reduction performance.
  • the maximum force was required, but the amount of rolling reduction was increased compared to the first comparative example. That is, a larger amount can be reduced under the same force condition.
  • the proportion of performance is higher, despite more rolling reduction results than the first and second comparative examples. It was smaller than this maximum value. That is, it showed a higher rolling amount at a lower performance ratio than the first and second comparative examples.
  • the rolling-down device 4200 it is possible to increase the rolling-down force without taking a large cost of remodeling the entire casting facility, thereby reducing the cost of improving the facility.
  • a sufficient pressing force can be transmitted to the non-solidified portion by arranging a plurality of convex rolls so that the width of the protruding portion decreases as the solid phase rate increases. Therefore, it is possible to suppress or prevent the occurrence of defects inside the cast iron, that is, shrinkage holes and segregation.

Abstract

L'invention concerne, selon un mode de réalisation, un dispositif de réduction de compression comprenant une pluralité de rouleaux convexes qui s'étendent dans le sens de la largeur d'une pièce coulée, ont des saillies faisant saillie vers l'extérieur à partir de leurs surfaces circonférentielles externes, et sont agencés en une rangée dans la direction longitudinale croisant le sens de la largeur de la pièce coulée, respectivement, les saillies de la pluralité de rouleaux convexes ayant des largeurs différentes les unes des autres et la pluralité de rouleaux convexes étant agencés de telle sorte que les largeurs des saillies deviennent plus étroites dans une direction dans laquelle une fraction solide augmente. En conséquence, selon un aspect de la présente invention, une pluralité de rouleaux convexes sont agencés de telle sorte que les largeurs de saillies soient réduites en fonction d'une augmentation d'une fraction solide et, par conséquent, qu'une force de réduction de compression suffisante puisse être transférée à une partie non solidifiée. Par conséquent, la présente invention peut supprimer ou empêcher un défaut dans une pièce coulée, c'est-à-dire l'apparition d'une ségrégation ou d'un trou réduit.
PCT/KR2019/015105 2018-11-08 2019-11-07 Dispositif de réduction de compression WO2020096391A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493363A (en) * 1976-07-30 1985-01-15 Jernkontoret Method at continuous casting of steels and metal alloys with segregation tendency and apparatus for carrying out the method
JP2003094154A (ja) * 2001-09-21 2003-04-02 Sanyo Special Steel Co Ltd 鋼の連続鋳造方法
JP2005193265A (ja) * 2004-01-06 2005-07-21 Nippon Steel Corp 鋼の連続鋳造設備および連続鋳造方法
KR20120054440A (ko) * 2010-11-19 2012-05-30 주식회사 포스코 주편 압하 장치 및 이를 이용한 연속주조 방법
JP2017100140A (ja) * 2015-11-30 2017-06-08 Ｊｆｅスチール株式会社 鋼の連続鋳造方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0281745U (fr) * 1988-12-08 1990-06-25
KR101252647B1 (ko) 2010-11-26 2013-04-09 주식회사 포스코 연속 주조 장치 및 이를 이용한 연속 주조 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493363A (en) * 1976-07-30 1985-01-15 Jernkontoret Method at continuous casting of steels and metal alloys with segregation tendency and apparatus for carrying out the method
JP2003094154A (ja) * 2001-09-21 2003-04-02 Sanyo Special Steel Co Ltd 鋼の連続鋳造方法
JP2005193265A (ja) * 2004-01-06 2005-07-21 Nippon Steel Corp 鋼の連続鋳造設備および連続鋳造方法
KR20120054440A (ko) * 2010-11-19 2012-05-30 주식회사 포스코 주편 압하 장치 및 이를 이용한 연속주조 방법
JP2017100140A (ja) * 2015-11-30 2017-06-08 Ｊｆｅスチール株式会社 鋼の連続鋳造方法

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