WO2019221469A1 - Moule - Google Patents

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Publication number
WO2019221469A1
WO2019221469A1 PCT/KR2019/005738 KR2019005738W WO2019221469A1 WO 2019221469 A1 WO2019221469 A1 WO 2019221469A1 KR 2019005738 W KR2019005738 W KR 2019005738W WO 2019221469 A1 WO2019221469 A1 WO 2019221469A1
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WO
WIPO (PCT)
Prior art keywords
mold
short side
convex member
width
convex
Prior art date
Application number
PCT/KR2019/005738
Other languages
English (en)
Korean (ko)
Inventor
김성연
이형준
조경철
김지준
조현진
Original Assignee
주식회사 포스코
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 주식회사 포스코 filed Critical 주식회사 포스코
Priority to EP19804126.1A priority Critical patent/EP3795273B1/fr
Priority to CN201980032076.3A priority patent/CN112118924B/zh
Priority to JP2020564092A priority patent/JP7037670B2/ja
Publication of WO2019221469A1 publication Critical patent/WO2019221469A1/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
    • B22D11/04—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
    • 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 the occurrence of defects and damage to the mold.
  • the cast steel is produced while the molten steel contained in the mold is cooled through the cooling stand.
  • the continuous casting process injects molten steel into a mold having a constant internal shape, and continuously draws the reacted slabs into the lower side of the mold to manufacture products of various shapes such as slabs, blooms, billets, beam blanks, and the like. It is a process.
  • the cast steel is manufactured using the rectangular mold of the form which assembled the long side part and the short side part.
  • the solidification shell begins to form from the molten steel of the molten steel in the mold, and the thickness of the solidification shell becomes thicker downward. And, the coagulation shell is lowered toward the lower temperature, thereby causing the coagulation shrinkage, which is not compensated in the mold, the air layer is formed between the mold and the cast.
  • the air layer is formed, the heat transfer capacity between the mold and the molten steel or the slab is reduced to cause a solidification delay phenomenon, and thus break out and cracks are generated in the cast.
  • the width of the lower part is reduced compared to the width of the upper part of the mold to incline the mold. That is, the solidification shrinkage of the long side of the cast steel is inclined to the mold short side, and the width of the lower side of the long side is made smaller than the width of the upper side of the long side to compensate.
  • the inclination is given to compensate by making the width of the bottom of the short side smaller than the width of the top of the short side.
  • the inclination of the short side portion is adjusted and fastened with the pair of long side portions. Then, in order to compensate for the solidification shrinkage rate in the short side direction of the cast steel, the side of the short side in contact with the long side is inclined, the short side is manufactured so that the width becomes smaller from the top to the bottom.
  • the solidification shrinkage of the long side of the cast steel can be adjusted by adjusting or changing the overall inclination of the short side, but the slope of the short side cannot be changed.
  • the solidification shrinkage of the long side of the cast steel is compensated by adjusting the installation inclination of the short side, or by providing a multi-taper on the short side to compensate by varying the amount of taper for each upper and lower positions, Compared to the long side, the compensation degree is generally small, and the same amount is compensated without adjusting the degree for each upper and lower positions.
  • the installation slope of the mold short side part is made larger in the related art.
  • wear occurs between the short side of the cast and the short side of the mold, thereby reducing the life of the mold, there is a problem that the quality of the cast.
  • the present invention provides a mold capable of improving the service life and suppressing wear with the cast steel.
  • the present invention provides a mold that can compensate for the solidification shrinkage of the solidification shell.
  • the present invention provides a mold for solidifying molten steel injected into an inner space, the body having the inner space; And a convex member protruding from the inner surface of the body in the inner space direction, and having a protruding length decreasing from the inner surface in the inner space direction toward the lower side.
  • variety of the said convex member is the same in an up-down direction.
  • the width of the convex member decreases toward the lower side.
  • the width of the convex member is short compared to the width of the body.
  • the width of the convex member is equal to the width of the body.
  • the boundary between the body inner surface and the convex member is a straight line.
  • the boundary between the body inner surface and the convex member is curved.
  • the boundary line is convex in the outward direction of the convex member.
  • the boundary line is concave in the inward direction of the convex member.
  • An upper portion of the convex member and an upper portion of the body are positioned at the same height, and the vertical extension length of the convex member is shorter than the vertical extension length of the body.
  • An upper portion of the convex member and an upper portion of the body are positioned at the same height, and the vertical extension length of the convex member is equal to the vertical extension length of the body.
  • the body includes a pair of long side members each extending in one direction and provided to face each other in a direction crossing the extension direction; And a pair of short side members each extending to intersect the long side member and provided to face each other to seal between the pair of long side members, wherein the convex member includes at least one of the long side member and the short side member. Is formed on one.
  • the separation distance of the pair of short side members is disposed to be inclined so as to decrease toward the lower side.
  • the side surface of the short side member in contact with the long side member is inclined toward the center in the width direction of the short side member toward the lower side.
  • the body includes protruding members formed at both end portions in the extending direction of the short side member to form a chamfered surface at the edge of the cast piece to be cast.
  • the mold according to the embodiments of the present invention it is possible to suppress or prevent surface defects and breakout due to shrinkage of the solidification shell as compared with the conventional. That is, the mold according to the embodiments of the present invention is improved in the compensation ratio for the shrinkage of the coagulation shell compared to the conventional. In particular, the mold according to the embodiments of the present invention is improved compared to the conventional compensation ratio for shrinkage at the short side of the solidification shell (C). Therefore, it is possible to suppress or prevent the occurrence of a gap between the mold inner surface and the solidification shell, thereby suppressing or preventing the solidification delay phenomenon.
  • the shrinkage compensation ratio at the short side of the solidification shell can be improved even if the inclination of the short side is not increased.
  • the installation inclination ratio of the short side is made larger, whereby wear between the short side of the cast and the mold short side occurs, thereby reducing the life of the mold and the quality of the cast. This has a problem of deterioration.
  • Fig. 1 shows the main parts of a typical continuous casting device.
  • FIG. 2 is a three-dimensional view showing a mold according to the first embodiment of the present invention.
  • Figure 3 is a front view for explaining that in the mold in the first embodiment of the present invention, a pair of short sides are installed so that the separation distance is reduced toward the lower side;
  • FIG. 4 is a front view for explaining a shape in which the side of the short side in contact with the long side in the mold according to the first embodiment of the present invention is inclined;
  • FIG. 5 is a diagram illustrating a short side part according to a first exemplary embodiment of the present invention.
  • FIG. 6 is a view for explaining a solidification shell (FIG. 6A) formed at an upper portion and a solidification shell (FIG. 6A) formed at a lower portion in the mold according to the first embodiment of the present invention.
  • FIG. 7 is a view for explaining the shape of the convex member, the width of the short side, and the width of the convex member in the short side according to the first embodiment of the present invention.
  • FIG. 8 is a view for explaining the extension length of the inner surface of the short side in the short side according to the first embodiment of the present invention.
  • FIG. 9 is a view showing a short side portion according to a first modification of the first embodiment
  • FIG. 10 is a view showing a short side portion according to a second modification of the first embodiment
  • FIG. 11 is a view showing a short side according to a second exemplary embodiment of the present invention.
  • FIG. 12 is a view showing a short side portion according to a first modification of the second embodiment
  • FIG. 13 is a view showing a short side portion according to a second modification of the second embodiment
  • FIG. 14 is a diagram illustrating a short side part according to a third exemplary embodiment of the present invention.
  • 15 is a view showing a short side portion according to a first modification of the third embodiment
  • FIG. 16 is a view showing a short side portion according to a second modification of the third embodiment
  • 17 is a view showing a short side according to a fourth embodiment of the present invention.
  • FIG. 18 is a diagram showing a short side portion according to a first modification of the fourth embodiment
  • 19 is a view showing a short side portion according to a second modification of the fourth embodiment.
  • FIG. 20 is a view showing a short side according to a fifth embodiment of the present invention.
  • 21 is a three-dimensional view showing a mold according to the sixth embodiment of the present invention.
  • FIG. 22 is a three-dimensional view showing a mold according to the seventh embodiment of the present invention.
  • 23 is a three-dimensional view showing the short side of the mold according to the seventh embodiment of the present invention.
  • FIG. 25 is a view for explaining a solidification shell (FIG. 6A) formed at an upper portion and a solidification shell (FIG. 6A) formed at a lower portion in a conventional mold.
  • FIG. 2 is a three-dimensional view showing a mold according to the first embodiment of the present invention.
  • 3 is a front view for explaining that in the mold according to the first embodiment of the present invention, a pair of short sides are installed such that their separation distance decreases toward the lower side.
  • 4 is a front view for explaining a shape in which the side of the short side in contact with the long side in the mold according to the first embodiment of the present invention is inclined.
  • 5A is a three-dimensional view of the short side according to the first exemplary embodiment of the present invention as viewed from an inner surface direction.
  • 5B is a front view as viewed from the inner surface direction in the short side portion according to the first embodiment of the present invention.
  • 5C is a view of the short side in the lateral direction of the short side according to the first embodiment of the present invention.
  • D, ⁇ , and ⁇ of FIG. 5D are top views at positions ⁇ , ⁇ , and ⁇ which are respective positions in the vertical direction (height direction or Z axis direction) of FIG. 5C.
  • FIG. 6 is a view illustrating a solidification shell (FIG. 6A) formed at the top and a solidification shell (FIG. 6B) formed at the bottom in the mold according to the first embodiment of the present invention.
  • FIG. 7 is a view for explaining the shape of the convex member, the width of the short side portion, and the width of the convex member in the short side portion according to the first embodiment of the present invention.
  • 8 is a view for explaining the extension length of the inner surface of the short side in the short side according to the first embodiment of the present invention.
  • a continuous casting apparatus includes a ladle 10 containing molten steel refined in a steelmaking process and a tundish for temporarily storing molten steel through an injection nozzle connected to the ladle 10. 20), a mold 300 that receives molten steel stored in the tundish 20 and initially solidifies to a predetermined shape, and an immersion nozzle for supplying the molten steel of the tundish 20 to the mold 300 (hereinafter, Nozzle 22).
  • a cooling table provided in the lower portion of the mold 300 and a plurality of segments 50 are continuously arranged to perform a series of molding operations while cooling the non-solidified slab 1 drawn from the mold 300 ( 40).
  • the mold 300 receives molten steel from the tundish 20 and initially solidifies the molten steel into a predetermined shape.
  • the mold 300 according to the embodiment is formed to protrude in the inner space direction from the inner surface of the body and the body having an inner space, the convex member 322 of the shape in which the protruding length from the inner surface toward the inner space toward the lower side is reduced. It includes.
  • the body according to the embodiment is formed in each extending in one direction, a pair of long sides 310 and spaced apart in the direction crossing or perpendicular to the extending direction and each extending in the direction crossing or perpendicular to the long side 310 It is formed, and comprises a pair of short sides 320 spaced apart in the direction crossing or perpendicular to the extending direction.
  • the pair of short sides 320 according to the exemplary embodiment may protrude in the inner space direction and include a convex member 322 having a shape in which the protruding length decreases toward the lower side.
  • each of which is formed extending in one direction, a pair of long sides 310 and spaced in a direction crossing or perpendicular to the extending direction and each of the long sides ( A pair of short sides are formed extending in a direction crossing or perpendicular to the 310, spaced apart in a direction crossing or orthogonal to the extending direction, and having a convex member 322 protruding in the internal space direction of the mold 300.
  • the unit 320 is included.
  • the extension direction of the long side part 310 is defined as the X axis direction
  • the extension direction of the short side part 320 is defined as the Y axis direction.
  • the separation direction of the pair of long sides 310 is the Y-axis direction
  • the separation direction of the pair of short sides 320 is the X-axis direction.
  • Each of the pair of long sides 310 extends in the X-axis direction as described above and is spaced apart in the Y-axis direction, which is a direction orthogonal to the X-axis direction. Accordingly, the pair of long sides 310 are disposed to face each other in the Y axis direction.
  • the pair of long side parts 310 will be referred to as first and second long side parts 310.
  • the pair of short sides 320 extend in the Y axis direction and are spaced apart in the X axis direction, which is a direction orthogonal to the extension direction of the Y axis direction or the long side part 310. Accordingly, the pair of short sides 320 are disposed to face each other in the X axis direction. In this case, the separation distance between the pair of short sides 320 may be smaller than the extension length of the long sides 310. Of course, the present invention is not limited thereto, and the separation distance between the pair of short sides 320 may be the same as the extending direction of the long sides 310.
  • the pair of short sides 320 will be referred to as first and second short sides 320.
  • the mold 300 is configured such that the short side 320 and the long side 310 are interconnected or coupled to each other.
  • one end of an extension direction of the first short side part 320 is connected to the inner surface of the first long side part 310 and the other end is connected to an inner surface of the second long side part 310, and an extension direction of the second short side part 320 is provided.
  • One end of the inner surface of the first long side portion 310, the other end is connected to the inner surface of the second long side portion 310.
  • the molten steel (M) is injected into the mold 300, solidification begins first along the inner surface of the mold 300, and thus the solidification shell C is formed along the inner surface of the mold 300.
  • the coagulation shell (C) becomes thicker toward the bottom, and shrinks by cooling by the mold 300 and cooling outside the mold 300.
  • the solidification shell (C) is mainly contracted in the extending direction of the inner surface of the mold (300). That is, the mold 300 contracts in the long side portion 310 extending direction and the short side portion 320 extending direction. More specifically, referring to FIG. 25, the solidification shell (hereinafter, referred to as long side solidification shell LC) formed along the long side portion 310 of the mold 300 extends in the long side portion 310 (the X axis direction). To shrink mainly, and the solidification shell (hereinafter, referred to as the short side solidification shell SC) formed along the short side portion 320 of the mold 300 mainly contracts in the extending direction (Y axis direction) of the short side portion 320.
  • the solidification shell (hereinafter, referred to as the short side solidification shell SC) formed along the short side portion 320 of the mold 300 mainly contracts in the extending direction (Y axis direction) of the short side portion 320.
  • the solidification shell (C) becomes thicker toward the bottom, so as shown in Figures 25a and 25b, compared to the upper side of the mold 300, the long side solidification shell (LC) and the short side solidification shell of the lower portion of the mold 300 (SC) is thick.
  • the long side coagulation shell LC decreases in its extension length (X-axis length) from the top to the bottom thereof, and the short side solidification shell SC is located at the top thereof.
  • the length of extension decreases toward.
  • each of the long side solidified shell LC and the short side solidified shell SC contracts in the center direction of the extending direction thereof.
  • the length of the lower side solidified shell LC and the short side solidified shell SC is shorter than that of the upper side.
  • Shrinkage of the solidification shell (C) generates an air layer or gap (Gap) between the inner surface of the mold 300 and the solidification shell (C), mainly shrinks in the direction of the center of the extending direction, the long side 310 and the short side A gap Gap is mainly generated at a corner of the mold 300 to which the part 320 is connected (see FIG. 25B).
  • the heat transfer capacity between the mold 300 and the molten steel M or the mold 300 and the solidification shell C is reduced, thereby causing a solidification delay phenomenon, thereby causing a break out and a crack in the cast steel. .
  • the mold 300 is generally provided so that the width of the inner portion decreases downward.
  • the first and second short sides 320 are disposed to face each other, as shown in FIGS. 2 and 3, each of the first and second short sides 320 is gradually lowered. It is inclined so as to be close to the center of the extension direction (X-axis direction) of the long side part 310.
  • FIG. In other words, the distance between the first short side 320 and the second short side 320 is inclined so as to decrease toward the lower side. Accordingly, the lower separation distance SL is shorter than the upper separation distance SL between the first short side 320 and the second short side 320.
  • the change in the separation distance between the first short side portion 320 and the second short side portion 320 means that the long side length of the cast steel decreases toward the lower side.
  • the first and second short sides 320 are arranged to be closer to each other toward the bottom, the inclination may vary according to the shrinkage of the long side solidification shell (LC). That is, the inclination of the long side solidified shell LC may be adjusted such that the pair of short side parts 320 are closer to each other toward the bottom according to the shrinkage rate at which the extended length thereof decreases toward the bottom.
  • LC long side solidification shell
  • the arrangement of the pair of short sides 320 closer to each other toward the bottom may be described as compensating for the long side contraction of the solidification shell C. Therefore, it is possible to prevent or suppress the occurrence of surface defects and breakout due to solidification shrinkage of the long side solidification shell LC.
  • each of the first and second short sides 320 is formed such that its extension length SW decreases toward the lower side thereof.
  • each of the first and second short sides 320 is formed such that its extension length (extension length in the Y-axis direction) SW decreases downward.
  • the length of the short side part 320 in the Y-axis direction is called the width SW of the short side part.
  • the width (SW) is formed to decrease toward the lower side.
  • each of the first and second short sides 320 has a lower width SW than the upper width SW of the upper portion SW. Accordingly, the separation distance of the first and second long sides 310 decreases toward the lower side.
  • the width SW of each of the first and second short sides 320 decreases toward the bottom, in other words, that both sides of the short sides 320 contacting the long sides 310 are inclined surfaces.
  • both side surfaces of the first and second short sides 320 may be inclined to become closer to the center of the width direction of the short sides 320 from the upper side to the lower side. Accordingly, the length of the first and second short sides 320 decreases in the Y-axis direction, that is, the width SW of the first and second short sides 320.
  • the side of the short side portion 320 of the mold 300 is formed to be inclined, and the long side portion 310 disposed in contact with the short side portion is disposed so as to be closer to each other, the short side solidification shell (SC). This is to suppress the occurrence of surface defects and breakout due to shrinkage.
  • the short side solidification shell (SC) decreases as the length of extension decreases toward the lower side by contraction, and both sides of the short side portion 320 are formed to be inclined to be closer to each other toward the lower side, so that the first and second long side portions 310 ),
  • the gap between the two ends and the long side 310 of the mold 300 and the solidification shell (C), more specifically, the short side solidification shell (SC) is generated. Prevented or suppressed.
  • the short side direction of the solidification shell (C) It can be described as compensating for shrinkage. Therefore, occurrence of surface defects and breakout due to solidification shrinkage of the short-side solidification shell SC is suppressed.
  • the long side direction solidification shrinkage compensation of the cast slab or the solidification shell C can be adjusted by adjusting the inclination such that the first and second short sides 320 are closer to each other toward the bottom.
  • both sides of the short side part 320 are determined at the time of manufacture of the short side part 320, and cannot be varied at the time of fastening with the long side part 310. And since the solidification shrinkage rate differs according to steel grade, operating conditions, etc., the inclination of the side surface of the short side part 320 cannot be made large enough. This means that the inclination of both sides of the short side portion 320 cannot be large enough to sufficiently compensate for the solidification shrinkage in the short side direction of the solidification shell C.
  • the mold 300 can not sufficiently compensate for the short side direction shrinkage of the solidification shell (C), as shown in Figure 25b, the gap (gap) is still generated.
  • the embodiment of the present invention provides a mold 300 that can prevent or further suppress the generation of a gap between the mold 300 and the inner surface of the mold 300 and the solidification shell C.
  • the mold 300 which makes contact between the inner surface of the mold 300 and the solidification shell C well without generating a gap or a gap between the inner surface of the mold 300 and the solidification shell C. to provide.
  • the inner surface of the short side portion 320 of the mold 300 is protruded or convex toward the inner space of the mold 300, as shown in Figs.
  • the degree is larger than the degree of protrusion of the lower part.
  • the short side part 320 according to the embodiment of the present invention will be described in detail.
  • variety direction of the short side part 320 ie, the Y-axis direction, is demonstrated.
  • One surface of both sides of the short-side portion 320 in the X-axis direction is an outer surface exposed to the outside of the mold 300, and the other surface is exposed to the internal space of the mold 300, and the molten steel M or the solidification shell C and It is the inner surface that is in direct contact.
  • the inner surface of the short side portion 320 according to the embodiment is a shape inclined upward from both edges in the width direction toward the center, and may have a shape having a curvature, that is, a convex shape.
  • the inside of the mold 300 from the inner surfaces of the short side member 321 and the short side member 321 extending in the Y-axis direction so that the short side portion 320 intersects or perpendicular to the long side portion 310. It is described that it is formed of a convex member 322 protruding in the space direction or the X-axis direction and extending in the Y-axis direction which is an extension direction of the short side member 321.
  • the length in the Y-axis direction among the convex members 322 is called the width PW of the convex member 322.
  • the length protruding from the short side member 321 toward the internal space of the mold 300 that is, the length in the X-axis direction is referred to as the protruding length A.
  • the protruding length A is referred to as the protruding length A.
  • the surface in contact with (C) the other surface is the inner surface of the convex member 322 or the inner surface of the short side portion 320.
  • the convex member 322 When the convex member 322 is formed to extend in the extension direction of the short side member 321, that is, in the width direction (Y-axis direction), the protruding length A increases toward the center from both ends in the extension direction.
  • a point or region having the maximum protruding length A may be a center point in the width direction of the convex member 322. Therefore, the inner surface of the convex member 322 may have a shape inclined upwardly from both ends in the width direction.
  • the protruding length A decreases from the center in the width direction toward both ends, and the inner surface of the convex member 322 is separated from the center in the width direction. It may have a shape inclined downward to both ends.
  • the convex member 322 may have a convex shape in the inner space direction of the mold 300. And, the inner side of the short side portion 320 or the convex member 322 is formed to have an inclination in the width direction, it may have a curvature so that the inclination in the Y-axis direction is variable.
  • the width PW of the convex member 322 may be smaller than the width SW of the short side member 321 as illustrated in FIGS. 5 and 7. At this time, it is preferable that the center of the width direction of the convex member 322 and the center of the width direction of the short side member 321 are concentric. Thus, referring to FIG. 7, the outer regions of both ends of the convex member 322 in the width direction may be flat as an inner surface of the short side member.
  • the width PW of the convex member 322 is smaller than the width SW of the short side member 321, and the center of the width direction of the convex member 322 and the center of the width direction of the short side member 321 are different.
  • the inner surface of the short side portion 320 includes an inner surface of the convex member 322 and an inner surface of the short side member 321 corresponding to the outer side of the inner surface of the convex member 322.
  • the vertical direction of the short side portion 320 according to the first embodiment that is, the Z axis direction will be described.
  • An inner surface of the short side portion 320 or the convex member 322 according to the first embodiment has a shape in which its protruding length A increases from both ends in the Y-axis direction toward the center.
  • the protruding length A of the upper portion is formed to be longer than the protruding length A of the lower portion.
  • the lower protruding length A is shorter than the protruding length A of the upper portion of the convex member 322.
  • the change in the protruding length A in the vertical direction may be a shape that continuously decreases from the top to the bottom without an area where the inclination does not change (see FIG. 5C).
  • the present invention is not limited thereto, and the change in the protruding length A in the up and down direction (Z axis direction) tends to decrease from the top to the bottom, but the protruding length A is changed in some regions of the up and down direction. In some other areas, the protruding length A may be in a staircase shape which does not change.
  • the convex member 322 is formed on the inner surface of the short side member 321 so as to protrude or convex in the inward direction of the mold 300, and the protruding length A of the convex member 322 is longer than the lower part and is lowered. As the protruding length A becomes shorter, the length of at least some of the inner surfaces of the short sides 320, in particular, is longer than in the related art.
  • the width (SW) may be the same.
  • a convex member 322 protruding from the short side member 321 in the direction of the internal space of the mold 300 is formed, and extends downward from the top.
  • at least the inner surface extension length SIL of the short side portion 320 on which the convex member 322 is formed is longer than the inner surface extension length SIL of the conventional short side portion 320 (see FIG. 8). That is, the extension length SIL of the inner surface of the short side portion 320 increases by the protruding length A of the convex member 322.
  • the extension length SIL of the inner side of the short side 320 is one end E 1 , which is one of both ends in the Y-axis direction of the inner side of the short side 320, from the other end E 2 to or from the other end to one end.
  • the inner surface of the short side portion 320 according to the embodiment has a curved shape that is bent at least one or more times by a convex member 322 rather than a straight line, and is compared from one end of the curve to the other end, compared to a path from one end of the straight line to the other end.
  • the route is long.
  • the extension length SIL of the inner surface is increased.
  • the length SIL of the inner surface of the short side portion 320 according to the embodiment is compared with the conventional short side portion 320 in which the entire inner surface is flat without the convex member 322 being formed.
  • the inner surface extension length SIL of the upper portion is longer than the inner surface extension length SIL of the upper portion of the conventional inner surface of the short side portion 320.
  • the inner surface extension length SIL of the lower portion of the inner surface of the short side portion 320 according to the embodiment may be the same as or similar to the inner surface extension length of the lower portion of the inner surface of the conventional short side portion 320.
  • the difference between the inner surface extension length of the upper region and the inner surface extension length of the lower region of the inner side of the short side portion 320 according to the embodiment is larger than in the prior art.
  • the conventional short side portion 320 has only a width SW change that decreases toward the lower side, but in the embodiment, a width SW change that decreases toward the lower side, and an inner surface extension of the short side in direct contact with the molten steel or the solidification shell.
  • the length SIL additionally has a change that decreases downward. Therefore, the reduction rate that decreases as the extension length SIL of the inner surface of the short side portion 320 decreases toward the bottom is lower than the reduction rate that decreases as the extension length SIL of the inner surface of the short side portions 320 is lower. Big.
  • the short side portion 320 is formed to have a convex member 322, and the extending length SIL of the inner side of the short side portion 320 is formed to decrease toward the lower side of the solidification shell C. To further compensate for the solidification shrinkage.
  • the rate of change that the protruding length A of the convex member 322 decreases toward the lower direction is adjusted according to the shrinkage rate change of the solidification shell C in the vertical direction. That is, as the protruding length A of the convex member 322 decreases toward the lower side, the reduction rate for reducing the extension length SIL of the inner surface of the short side portion 320 decreases as the short side solidification shell SC contracts to the lower side. Adjust the length in the Y-axis direction so that it corresponds, equals, or synchronizes with a shorter shrinkage.
  • the change in the protruding length A of the convex member 322 may be obtained through several experiments depending on the steel grade to be cast, the casting speed, the casting facility, and the like.
  • the shrinkage in the short side direction of the solidification shell C is compensated only by the change in the width SW of the short side 320. That is, by making both sides of the short side portion 320 closer to the lower side, the short-side shrinkage of the solidification shell C is compensated.
  • the inclination of the side of the short side portion 320 is determined when the short side portion 320 is manufactured, and when the inclination is increased, problems may occur in the operation, so that the solidification shell (C) There was a limit to compensating short lateral contractions.
  • the shrinkage compensation ratio in the short side direction of the solidification shell (C) can be improved compared to the prior art. have.
  • the gap between the short side solidification shell (SC) and the long side portion 310 is suppressed by the short side contraction of the solidification shell (C) or the short side solidification shell (SC). You can prevent it. Therefore, it is possible to suppress the occurrence of surface cracks and breakouts caused by shrinkage of the solidification shell C.
  • 9A is a three-dimensional view seen from the inner surface direction in the short side portion according to the first modification of the first embodiment.
  • 9B is a front view as viewed from the inner surface direction in the short side portion according to the first modification of the first embodiment.
  • 9C is a view of the short side in the lateral direction according to the first modification of the first embodiment.
  • V, V, and V in FIG. 9D are top views at respective positions V, V, and V in the vertical direction (height direction or Z axis direction) of FIG. 9C.
  • FIG. 10A is a three-dimensional view seen from the inner surface direction in the short side portion according to the second modification of the first embodiment.
  • 10B is a front view of the short side according to the second modification of the first embodiment as seen from the inner surface direction.
  • FIG. 10C is a view as viewed from the side of the short side, in the short side according to the second modification of the first embodiment.
  • FIG. D, ⁇ , and ⁇ of FIG. 10D are top views at respective positions ⁇ , ⁇ , and ⁇ in the vertical direction (height direction or Z axis direction) of FIG. 10C.
  • 11A is a three-dimensional view of the short side according to the second exemplary embodiment of the present invention as viewed from an inner surface direction.
  • 11B is a front view of the short side according to the second exemplary embodiment of the present invention, viewed from an inner surface direction.
  • 11C is a view of the short side in the lateral direction according to the second embodiment of the present invention.
  • VII, VII, and VII in FIG. 11D are top views at respective positions VII, VII, and VII in the vertical direction (height direction or Z axis direction) of FIG. 11C.
  • 12A is a three-dimensional view seen from the inner surface direction in the short side portion according to the first modification of the second embodiment.
  • 12B is a front view as viewed from the inner surface direction in the short side portion according to the first modification of the second embodiment.
  • 12C is a view as viewed from the side of the short side, in the short side according to the first modification of the second embodiment.
  • D, ⁇ , and ⁇ of FIG. 12D are top views at positions ⁇ , ⁇ , and ⁇ which are respective positions in the vertical direction (height direction or Z axis direction) of FIG. 12C.
  • FIG. 13A is a stereoscopic view seen from the inner surface direction in the short side portion according to the second modification of the second embodiment. It is a front view seen from the inner surface room in the short side part which concerns on the 2nd modified example of 2nd Example.
  • FIG. 13C is a view of the short side in the lateral direction according to the second modification of the second embodiment, as viewed from the lateral direction.
  • FIG. D, ⁇ , and ⁇ of FIG. 13D are top views at positions ⁇ , ⁇ , and ⁇ which are respective positions in the vertical direction (height direction or Z axis direction) of FIG. 13C.
  • the convex member 322 is formed such that its protruding length A decreases from top to bottom.
  • the length H 2 extending in the vertical direction of the convex member 322 may be shorter or the same as the length H 1 extending in the vertical direction of the short side member 321.
  • the width PW of the convex member 322 may not change in the vertical direction or may decrease toward the lower side.
  • the 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. Accordingly, since the area corresponding to the lower side of the convex member 322 among the inner surfaces of the short side member 321 is an area where the convex member is not formed, the inner surface of the short side portion 320 in contact with the molten steel or the solidification shell is flat ( flat shape.
  • the vertical extension length H 2 of the convex member 322 may be greater than 0.5 and less than 1 of the vertical extension length H 1 of the short side member 321.
  • the vertical extension length H 2 of the convex member 322 may be 0.9 of the vertical extension length H 1 of the short side member 321 (see FIGS. 5A and 5B).
  • the upper height of the convex member 322 is formed to be equal to the upper height of the short side member 321.
  • the convex member 322 is formed in the upper region from 0.1 point in the vertical direction of the short side member 321. It is a flat shape in which the convex member 322 is not formed in 0.1 area
  • the vertical extension length H 2 of the convex member 322 is not limited thereto, and the vertical extension length H of the convex member 322 (as in the first modification of the first embodiment shown in FIGS. 9A, 9B, and 9C) is not limited thereto.
  • H 2 may be 0.5 of the vertical extension length H 1 of the short side member 321.
  • the convex member 322 is formed in the upper region from the 0.5 point in the up-down direction among the short side members 321, and the convex member 322 is not formed in the region below the 0.5 point. It is a flat shape.
  • the present invention is not limited thereto, and the vertical extension length H 2 of the convex member 322 is shorter than the vertical extension length H 1 of the short side member 321, but the vertical extension length H of the short side member 321 ( May be less than 0.5 of H 1 ).
  • the vertical extension length H 2 of the convex member 322 may be the same as the vertical extension length H 1 of the short side member 321 as in the second modification illustrated in FIG. 10. That is, the convex member 322 may be formed entirely from the top to the bottom of the short side member 321.
  • the convex member 322 does not change its width PW. That is, the positions of both ends (one end and the other end) in the width direction may be the same for each height of the convex member 322.
  • a line connecting one end of the convex member 322 continuously formed in the height direction of the convex member 322 and connecting the other end of the convex member 322 continuously formed in the height direction of the convex member 322 is referred to as a 'boundary line ( DL) '.
  • the boundary line DL may refer to a line where an inner surface of the short side member 321 and an outermost side of the convex member 322 meet.
  • the convex member 322 according to the first exemplary embodiment may be a straight line whose boundary line DL has no curvature (see FIGS. 5 to 10).
  • the width PW of the convex member 322 decreases downward, the width decreases at a constant rate.
  • the overall shape of the convex member 322 formed on the inner surface of the short side member 321 may be a rectangular shape with no change in width or area (see FIGS. 5 to 10).
  • the rate of change of the vertical extension length H 2 of the convex member 322 and the protruding length A of the convex member 322 in the vertical direction is the short-side solidification.
  • the shell (SC) contracts and adjusts to correspond to the contraction rate which is shorter in the Y-axis direction as it goes to the lower side, corresponding to or equal to the contraction rate.
  • the convex member 322 according to the first embodiment and the modifications thereof described above is reduced as the protruding length A decreases downward, but the width PW is the same without changing in the vertical direction.
  • the present invention is not limited thereto, and the width PW of the convex member 322 may decrease in a downward direction as in the second embodiment of FIGS. 11 to 13. That is, the convex member 322 according to the second embodiment has a shape in which its protruding length A decreases downwards, and at the same time, its width PW decreases downwards.
  • the vertical extension length H 2 of the convex member 322 extends in the vertical direction of the short side member 321 as in the second embodiment shown in FIGS. 11 and 12 and the first modified example of the second embodiment. It may be shorter than the length H 1 . Accordingly, the region where the convex member 322 is not formed, that is, the lower region of the short side member 321, may be flat in the inner surface of the short side member 321.
  • the vertical extension length H 2 of the convex member 322 may be the same as the extension length H 1 of the short side member 321 as in the second modification of the second embodiment illustrated in FIG. 13. Accordingly, the convex member 322 according to the second modification of the second embodiment may be formed entirely from the top to the bottom of the short side member 321.
  • the convex member 322 according to the second embodiments is formed such that its width PW decreases downward.
  • the position of both ends in the width direction of the convex member 322 is closer to the center of the short side member 321 as it goes downward.
  • the positions of both ends (one end and the other end) in the width direction may be different for each height of the convex member 322.
  • a line connecting one end of the convex member 322 continuously formed in the height direction of the convex member 322 and connecting the other end of the convex member 322 continuously formed in the height direction of the convex member 322 is referred to as a 'boundary line ( DL) '
  • the shape formed by the boundary line DL may be an inverted triangle shape (see FIGS. 11 to 13) or an inverted trapezoidal shape (see FIG. 11C).
  • the convex member 322 according to the second embodiment may be a straight line whose boundary line does not have a curvature.
  • the overall shape of the convex member 322 may be an inverted triangle or an inverted trapezoidal shape whose width or area becomes narrower toward the lower side.
  • the rate of change of the protruding length of the convex member 322 and the rate of change of the width of the convex member 322 in the vertical extension length and the vertical direction of the convex member 322 are Y as the short-side solidified shell SC contracts and moves downward. Adjust to match, equal to, or synchronize with shorter shrinkage in the axial direction.
  • 14A is a stereoscopic view seen from the inner surface direction in the short side portion according to the third embodiment.
  • 14B is a front view as viewed from the inner surface direction in the short side portion according to the third embodiment.
  • 14C is a view as viewed from the side of the short side, in the short side according to the third embodiment.
  • VII, VII, and VII in FIG. 14D are top views at positions VII, VII, and VII in the vertical direction (height direction or Z axis direction) of FIG. 14C.
  • 15A is a three-dimensional view of the short side portion according to the first modification of the third embodiment as viewed from the inner surface direction.
  • 15B is a front view as viewed from the inner surface direction in the short side portion according to the first modification of the third embodiment.
  • 15C is a view of the short side in the lateral direction according to the first modification of the third embodiment.
  • D, ⁇ , and ⁇ of FIG. 15D are top views at respective positions ⁇ , ⁇ , and ⁇ in the vertical direction (height direction or Z axis direction) of FIG. 15C.
  • FIG. 16A is a stereoscopic view seen from the inner surface direction in the short side portion according to the second modification of the third embodiment.
  • 16B is a front view of the short side according to the second modification of the third embodiment as seen from the inner surface direction.
  • FIG. 16C is a view of the short side in the lateral direction according to the second modification of the third embodiment, as viewed from the lateral direction.
  • FIG. D, ⁇ , and ⁇ of FIG. 16D are top views at positions ⁇ , ⁇ , and ⁇ which are respective positions in the vertical direction (height direction or Z axis direction) of FIG. 16C.
  • the convex member 322 connects one end of the convex member 322 continuously formed in the height direction of the convex member 322, and is formed in the convex member 322 in the height direction of the convex member 322.
  • the present invention is not limited thereto, and as shown in the third exemplary embodiment illustrated in FIGS. 14 to 16, the boundary line DL may have a curvature.
  • the convex member 322 according to the third embodiment may have a shape in which the boundary line DL has a convex or positive curvature to the outside of the convex member 322.
  • the width PW of the convex member 322 decreases downward, which may mean that the reduction rate is not constant.
  • the vertical extension length H 2 of the convex member 322 is the vertical extension length of the short side member 321. Shorter than (H 1 ).
  • the vertical extension length H 2 of the convex member 322 is the same as the vertical extension length H 1 of the short side member 321.
  • the convex member 322 has a shape formed by the boundary line DL in the shape of an inverted triangle, and the boundary line DL is convex or positive outward of the convex member 322. It may be a shape having.
  • 17A is a three-dimensional view seen from the inner surface direction in the short side portion according to the fourth embodiment.
  • 17B is a front view as viewed from the inner surface direction in the short side portion according to the fourth embodiment.
  • 17C is a view of the short side in the lateral direction according to the fourth embodiment.
  • VII, VII, and VII in FIG. 17D are top views of the positions VII, VII, and VII in the vertical direction (height direction or Z axis direction) of FIG. 17C.
  • 18A is a three-dimensional view seen from the inner surface direction in the short side portion according to the first modification of the fourth embodiment.
  • 18B is a front view of the short side according to the first modification of the fourth embodiment as seen from the inner surface direction.
  • 18C is a view of the short side shown in the lateral direction of the short side according to the first modification of the fourth embodiment.
  • VII, VII, and VII in FIG. 18D are top views at respective positions VII, VII, and VII in the vertical direction (height direction or Z axis direction) of FIG. 18C.
  • 19A is a three-dimensional view seen from the inner surface direction in the short side portion according to the second modification of the fourth embodiment.
  • 19B is a front view of the short side according to the second modification of the fourth embodiment, as viewed from the inner surface direction.
  • 19C is a view as viewed from the side of the short side, in the short side according to the second modification of the fourth embodiment.
  • D, ⁇ , and ⁇ of FIG. 19D are top views at positions ⁇ , ⁇ , and ⁇ which are respective positions in the vertical direction (height direction or Z axis direction) of FIG. 19C.
  • the boundary line is a shape having a convex or positive curvature to the outside of the convex member 322.
  • the present invention is not limited thereto, and as in the fourth exemplary embodiment illustrated in FIGS. 17 to 19, the convex member may have a shape in which the boundary line DL has a concave or negative curvature inside the convex member 322. .
  • the vertical extension length H 2 of the convex member 322 is the vertical extension length of the short side member 321. Shorter than (H 1 ).
  • the width PW thereof is shorter than the width SW of the short side member 321.
  • the present invention is not limited thereto, and the width PW of the convex member 322 may correspond to or be equal to the width SW of the short side member 321, as in the fifth exemplary embodiment illustrated in FIG. 20.
  • the width PW of the convex member 322 in the up and down direction is not the same as in the first and first embodiments described above, but varies according to the change in the width SW of the short side member 321. . That is, the width PW of the convex member 322 is reduced to be equal to or synchronized with the rate of change narrowing toward the bottom of the width SW of the short side member 321.
  • the extension length SIL of the inner surface of the short side portion 320 decreases toward the lower side.
  • 21 is a three-dimensional view showing a mold according to the sixth embodiment in which convex members are provided on each of the long side portion and the short side portion.
  • 22 is a three-dimensional view showing the mold according to the seventh embodiment with the corner chamfered.
  • 23 is a three-dimensional view showing the short side of the mold according to the seventh embodiment.
  • the short side portion 320 of the mold includes the convex member 322. That is, the inner surface of the short side portion 320 has been described as protruding or convex in the inward direction of the mold 300.
  • the long side portion 310 of the mold 300 may include the convex member 312. That is, as in the sixth embodiment illustrated in FIG. 21, the long side part 310 extends from the inner surfaces of the long side member 311 and the long side member 311 extending in the X-axis direction to intersect or orthogonal to the short side part 320.
  • the convex member 312 is formed to protrude in the internal space direction or the Y axis direction of the mold 300 and extends in the X axis direction, which is an extension direction of the long side member 311.
  • the convex member 312 of the long side portion 310 may be applied to the first to fifth embodiments described with reference to FIGS. 5 and 9 to 8 to 20.
  • each of the long side portion 310 and the short side portion 320 includes block members 312 and 322, but is not limited thereto.
  • the convex member 312 may be provided only at the long side portion 310. (Not shown).
  • forming the inner surface of the short side portion 320 to protrude or convex in the inner space direction of the mold 300 may be applied to a CHAMMFERED MOLD as shown in FIG. 22. Can be.
  • the mold 300 according to the seventh embodiment includes a pair of long sides 310, each of which is formed to extend in one direction and spaced apart from each other in a direction crossing or perpendicular to the extension direction, and each of the molds 310 intersects the long sides 310. Or it is formed extending in the direction orthogonal, and includes a pair of short sides 320 spaced apart in the direction crossing or perpendicular to the extension direction.
  • the short side portion 320 includes a protruding member 323 protruding in the inner direction of the mold 300. That is, the short side portion 320 according to the seventh embodiment has a short side member 321 extending in the Y axis direction and an inner space direction of the mold 300 from the inner side surfaces of both edges in the Y axis direction of the short side member 321.
  • a convex member 322 protruding from the inner surface of the short side member 321 between the pair of protruding members 323 and the pair of protruding members 323 formed in the inner space direction or the X-axis direction of the mold 300. It includes.
  • the protruding member 323 is configured to form a chamfer in the mold 300, and may be referred to as a chamfering protruding member 323.
  • the convex member 322 of the short side portion 320 may be applied to the first to fifth embodiments described with reference to FIGS. 5 and 9 to 8 to 20.
  • the convex member 322 may be further provided in the long side part 310 or may be provided only in the long side part 310.
  • the mold 300 has a long side portion 310 and a short side portion 320 having different lengths, and thus, has a substantially rectangular shape.
  • the present invention is not limited thereto, and the mold 300 may have a square shape.
  • the short side part 320 is configured to be separated into the short side member 321 and the convex member 322, or the long side part 310 is divided into the long side member 311 and the convex member 312.
  • the short side member 321 and the convex member 322 may be of an integral type
  • the long side member 311 and the convex member 312 may be of an integral type.
  • the mold 300 according to the embodiments of the present invention it is possible to suppress or prevent surface defects and breakout due to shrinkage of the solidification shell C as compared with the related art. That is, the mold 300 according to the embodiments of the present invention is improved in the compensation ratio for the shrinkage of the solidification shell (C) compared to the conventional. In particular, the mold 300 according to the embodiments of the present invention is improved in the compensation ratio for shrinkage in the short side direction of the solidification shell (C) compared to the prior art. Therefore, it is possible to suppress or prevent the occurrence of a gap between the inner surface of the mold 300 and the solidification shell C, thereby preventing or preventing the solidification delay phenomenon.
  • the shrinkage compensation ratio in the short side direction of the solidification shell C can be improved.
  • the installation inclination of the short side portion 320 is increased to increase the shrinkage compensation ratio in the short side direction of the solidification shell C. At this time, wear between the short side of the cast iron and the mold short side portion 320 occurs. Accordingly, the life of the mold 300 is reduced, there is a problem that the quality of the cast steel is reduced.
  • the mold according to the embodiments of the present invention it is possible to suppress or prevent surface defects and breakout due to shrinkage of the solidification shell as compared with the conventional. That is, the mold according to the embodiments of the present invention is improved in the compensation ratio for the shrinkage of the coagulation shell compared to the conventional. In particular, the mold according to the embodiments of the present invention is improved compared to the conventional compensation ratio for shrinkage at the short side of the solidification shell (C). Therefore, it is possible to suppress or prevent the occurrence of a gap between the mold inner surface and the solidification shell, thereby suppressing or preventing the solidification delay phenomenon.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
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Abstract

Un mode de réalisation de la présente invention concerne un moule destiné à solidifier un acier fondu injecté dans un espace intérieur de celui-ci, le moule comprenant : un corps ayant un espace intérieur ; et un élément convexe faisant saillie à partir d'une surface intérieure du corps dans la direction vers l'espace intérieur, la longueur de saillie depuis la surface intérieure dans la direction vers l'espace intérieur étant réduite à mesure qu'elle se déplace vers le côté inférieur de l'élément convexe. Un moule selon des modes de réalisation de la présente invention peut limiter ou empêcher un défaut de surface et une rupture due à la contraction d'une coque de solidification, par comparaison avec un moule classique. C'est-à-dire, un moule selon des modes de réalisation de la présente invention présente un taux de compensation amélioré par rapport à la contraction d'une coque de solidification, par comparaison avec un moule classique. En particulier, un moule selon des modes de réalisation de la présente invention présente un taux de compensation amélioré par rapport à la contraction d'une coque de solidification (C) dans la direction vers un côté plus court de la coque de solidification (C), par comparaison avec un moule classique. Par conséquent, le moule peut limiter ou empêcher la production d'un espace entre une surface intérieure du moule et la coque de solidification, ce qui permet de limiter ou d'empêcher un phénomène de retard de solidification dû à l'espace.
PCT/KR2019/005738 2018-05-14 2019-05-13 Moule WO2019221469A1 (fr)

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

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