KR20100127549A - Dummy-bar for the thinner-slab continuous casting apparatus - Google Patents

Dummy-bar for the thinner-slab continuous casting apparatus Download PDF

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Publication number
KR20100127549A
KR20100127549A KR1020090046042A KR20090046042A KR20100127549A KR 20100127549 A KR20100127549 A KR 20100127549A KR 1020090046042 A KR1020090046042 A KR 1020090046042A KR 20090046042 A KR20090046042 A KR 20090046042A KR 20100127549 A KR20100127549 A KR 20100127549A
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South Korea
Prior art keywords
head
continuous casting
dummy bar
dummy
bar
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KR1020090046042A
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Korean (ko)
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문준혁
정해용
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현대제철 주식회사
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Priority to KR1020090046042A priority Critical patent/KR20100127549A/en
Publication of KR20100127549A publication Critical patent/KR20100127549A/en

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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
    • B22D11/08—Accessories for starting the casting procedure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/068—Accessories therefor for cooling the cast product during its passage through the mould surfaces
    • 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
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • B22D11/208—Controlling or regulating processes or operations for removing cast stock for aligning the guide rolls

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

Abstract

PURPOSE: A dummy-bar for a thin slab continuous casting device is provided to form a non-solidified layer at the center of ferritic stainless steel by reducing the amount of discharged heat. CONSTITUTION: A dummy-bar for a thin slab continuous casting device is composed of a body(21) and a head(22). The head is formed on the top of the body and is inserted into the bottom of a mold(10). The center of the head is concave. Both sides of the head are inclined. Rust heads(30) are installed on the top of the head. Protrusions(31) are formed on the rust heads.

Description

박슬라브 연속주조기의 더미바{Dummy-Bar for the Thinner-Slab continuous casting apparatus}Dummy-Bar for the Thinner-Slab continuous casting apparatus

본 발명은 박슬라브 연속주조기의 더미바에 관한 것으로, 보다 상세하게는 연속주조 개시 시 초기 주편의 중심부 과냉을 방지하여 크랙 발생을 방지할 수 있도록 된 박슬라브 연속주조기의 더미바에 관한 것이다.The present invention relates to a dummy bar of a thin slab continuous casting machine, and more particularly, to a dummy bar of a thin slab continuous casting machine which can prevent the occurrence of cracks by preventing the supercooling of the center portion of the initial cast at the start of continuous casting.

연속주조기의 더미바는 연속주조 공정을 개시할 때, 몰드로 주입되는 용강이 부적절하게 흘러내리는 것을 방지하고 주조되어 나오는 제품의 연주속도에 맞추어 제품의 선두를 유도하기 위해 사용되는 것이다.The dummy bar of the continuous casting machine is used to prevent improper flow of molten steel injected into the mold at the beginning of the continuous casting process and to lead the product at the playing speed of the casting product.

턴디쉬에서 몰드로 주입된 용강은 상기 더미바의 헤드와 밀착된 상태로 응고된다. 이후, 핀치롤에 의해 더미바가 하방으로 이동될 때 응고된 초기 주편(이하, 초주편이라 칭함)이 함께 하방으로 이동됨으로써 연속주조가 개시된다.The molten steel injected into the mold in the tundish is solidified in close contact with the head of the dummy bar. Then, when the dummy bar is moved downward by the pinch roll, the solidified initial cast (hereinafter referred to as ultra cast) is moved downward together to start continuous casting.

이후, 벤딩롤에 의해 더미바와 주편이 분리되는데 분리된 더미바는 하방으로 이동되어 라인에서 이탈되고, 주편은 가이드롤을 따라 이동되면서 연속주조가 진행된다.Thereafter, the dummy bar and the slab are separated by the bending roll, the separated dummy bar is moved downward to be separated from the line, and the cast is moved along the guide roll while the continuous casting is performed.

한편, 박(薄)슬라브 연속주조시에는 초기 용강 주입량이 일반 슬라브 연속주 조에 비해 1/4 정도이고, 주조 속도가 상대적으로 빨라서 초기 냉각량 및 초기 생성 응고층 불균일도에 따른 크랙 발생의 우려가 매우 크다.On the other hand, in the case of continuous continuous slab casting, the initial molten steel injection rate is about 1/4 of that of the general slab continuous casting, and the casting speed is relatively fast, so that there is a risk of cracking due to the initial cooling amount and the unevenness of the initial solidification layer. very big.

그런데, 종래의 더미바 헤드는 중심이 상방으로 돌출되어 용강쪽으로 진입되어 있기 때문에 용강의 중심 부분이 과냉되어 응고층이 두텁게 형성된다.However, since the center of the conventional dummy bar head protrudes upward and enters the molten steel, the central portion of the molten steel is supercooled to form a solidified layer.

즉, 초주편의 중심 부분에서 집중 냉각이 발생하여 재료의 연성이 상대적으로 작은 영역이 발생하게 되며, 이에 따라 초주편의 폭방향의 응고가 진행함에 따라 수축에 따른 응력이 중심부 응고층의 연성을 초과할 경우에는 초주편의 표면에 크랙이 발생하게 된다.In other words, concentrated cooling occurs in the center portion of the ultra-thin piece, so that a region having a relatively low ductility of the material is generated. In this case, cracks are generated on the surface of the ultra cast.

상기와 같이 제품의 표면에 크랙이 발생함으로써 제품의 표면 품질이 저하되고, 따라서 초주편에서 크랙이 발생한 선단 부분을 절단하여 제거하게 되므로 제품의 회수율이 저하되는 문제점이 있었다.As the crack is generated on the surface of the product as described above, the surface quality of the product is deteriorated, and thus the cutting part of the product is deteriorated because the front end portion of the crack is cut off and removed.

이에 본 발명은 상기와 같은 문제점을 해결하기 위해 안출된 것으로, 초주편의 중심부 과냉을 방지하여 초주편의 표면에 크랙이 발생하는 것을 방지함으로써 제품의 표면 품질과 회수율을 향상시킬 수 있도록 된 박슬라브 연속주조기의 더미바를 제공함에 그 목적이 있다.Accordingly, the present invention has been made to solve the above problems, the thin slab continuous casting machine that can improve the surface quality and recovery rate of the product by preventing the occurrence of cracks on the surface of the ultra-thin piece to prevent the supercooling of the center piece The purpose is to provide a dummy bar.

상기와 같은 목적을 달성하기 위한 본 발명은,The present invention for achieving the above object,

바디와;Body;

상기 바디의 상부에 형성되어 연속주조 개시전 몰드의 하부에 삽입되며, 중심부가 오목한 형상으로 형성된 헤드;A head formed on an upper portion of the body and inserted into a lower portion of a mold before initiating continuous casting, and having a central portion formed in a concave shape;

를 포함하여 이루어진다.It is made, including.

또한, 상기 헤드의 상면은 중심부를 기준으로 양쪽에 경사면이 형성된 완만한 V자 형상으로 형성된다.In addition, the upper surface of the head is formed in a gentle V-shape formed inclined surfaces on both sides with respect to the center.

또한, 상기 헤드의 상면에, 상방으로 돌출 형성된 돌기부가 형성된 러스트헤드가 장착된다.In addition, on the upper surface of the head, a thrust head having protrusions protruding upward is mounted.

이상 설명한 바와 같은 본 발명에 따르면,According to the present invention as described above,

헤드의 상면이 중심부가 오목한 형상으로 형성됨으로써 용강 중심부의 열방출량이 감소되어 초주편 중심부에 미응고층이 형성된다.Since the upper surface of the head is formed in a concave shape in the center, the amount of heat released in the center of the molten steel is reduced, so that an unsolidified layer is formed in the center of the ultrathin piece.

따라서 초주편 응고시 수축에 의한 응력이 발생하여도 내부연성이 존재하므로 제품 표면에 크랙이 발생하는 것이 방지된다.Accordingly, cracks are prevented from occurring on the surface of the product because internal ductility exists even when stress caused by shrinkage occurs during solidification of the ultra slab.

따라서, 제품의 표면 품질이 향상되며, 초주편 선단 절단량이 감소하여 제품의 회수율이 향상되는 효과가 있다.Therefore, the surface quality of the product is improved, and the cutting amount of the cutting edge is reduced, and thus the recovery rate of the product is improved.

이하, 본 발명을 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings the present invention will be described in detail.

도 1은 몰드에 헤드가 삽입되어 있는 더미바의 개략도이다.1 is a schematic view of a dummy bar with a head inserted in a mold.

박슬라브 연주기의 더미바(20)는 바디(21)와 그 상부에 형성된 헤드(22)를 포함하여 이루어지며, 상기 바디(21)는 직선 일체형으로 되어 있고, 상기 헤드(22)는 연속주조 개시 전에는 몰드(10)의 하부에 삽입되어 있다.The dummy bar 20 of the thin slab player includes a body 21 and a head 22 formed thereon, the body 21 is of a straight line type, and the head 22 starts continuous casting. Previously, it is inserted under the mold 10.

본 발명에 따른 상기 더미바(20)는 상기 헤드(22)의 중심부가 하방으로 오목하게 형성된 것을 특징으로 한다.The dummy bar 20 according to the present invention is characterized in that the central portion of the head 22 is formed concave downward.

즉, 도시된 바와 같이, 상기 헤드(22)의 상면(22a)이 중심부를 기준으로 양쪽에 경사면이 형성된 완만한 V자 형상을 이룬다.That is, as shown, the upper surface (22a) of the head 22 forms a gentle V-shape formed inclined surfaces on both sides with respect to the center.

한편, 상기 더미바(20) 헤드(22)의 상면(22a)에는 러스트헤드(30)가 부착된다.Meanwhile, the thrust head 30 is attached to the top surface 22a of the head 22 of the dummy bar 20.

상기 러스트헤드(30)는 상기 더미바(20) 헤드(22)의 상면(22a)에 밀착 고정되는 평판 형상의 바디와, 그 바디의 상면에 상방으로 돌출 형성된 돌기부(31)로 이루어진다.The rust head 30 is composed of a flat body that is tightly fixed to the upper surface 22a of the dummy bar 20, the head 22, and a protrusion 31 protruding upward on the upper surface of the body.

상기 더미바(20) 헤드(22)의 상면(22a) 양쪽이 평면 형태의 경사면으로 이루 어짐으로써 러스트헤드(30)의 바디를 평판형의 단순한 형태로 제작할 수 있으며, 러스트헤드(30)를 더미바(20) 헤드(22)에 부착하기 용이하다.Both sides of the top surface 22a of the head 22 of the dummy bar 20 are formed in a planar inclined surface, so that the body of the rust head 30 can be manufactured in a simple flat form, and the rust head 30 is piled up. The bar 20 is easy to attach to the head 22.

상기 돌기부(31)의 형상에는 특별한 제한이 없으나 용강 응고시 용강과의 결합력이 보다 큰 형상이 바람직하다.The shape of the protrusion part 31 is not particularly limited, but a shape having a greater bonding force with molten steel at the time of solidifying molten steel is preferable.

도시된 상태와 같이, 몰드(10)의 하부로 더미바(10)의 헤드(22)가 삽입되고, 상기 몰드(10)의 내부로 상방으로부터 용강이 주입된 상태에서 시간이 경과하여 용강이 어느 정도 응고되면 상기 러스트헤드(30)의 돌기부(31)와 용강이 결합되며, 그 상태에서 더미바(20)의 바디(21)를 하방으로 이동시키면 더미바(20)의 헤드(22)가 몰드(10)로부터 빠지면서 용강을 잡아당겨 몰드(10)로부터 배출시키며, 이후 냉각수에 의한 냉각을 통해 초주편이 형성되고, 초주편의 하강 이동에 따라 연속주조가 계속 진행된다.As shown in the drawing, the head 22 of the dummy bar 10 is inserted into the lower portion of the mold 10, and in the state in which molten steel is injected from the upper side into the mold 10, the molten steel is removed. When the solidification degree is solid, the protrusion part 31 of the thrust head 30 and the molten steel are coupled, and when the body 21 of the dummy bar 20 is moved downward in the state, the head 22 of the dummy bar 20 is molded. The molten steel is pulled out from (10) and discharged from the mold (10), after which an ultra cast is formed through cooling by the cooling water, and the continuous casting continues as the down cast moves.

상기와 같이 더미바(20) 헤드(22)의 상면이 중심이 오목한 형상으로 형성됨에 따라 더미바(20) 헤드(22)와의 접촉에 따른 열전달(열방출)은 주로 상기 헤드(22)의 양쪽 경사면에 접한 부분(A부:열방출부)에서 이루어지게 된다.As the upper surface of the dummy bar 20, the head 22 is formed in a concave shape as described above, heat transfer (heat dissipation) due to contact with the dummy bar 20, the head 22 is mainly on both sides of the head 22. It is made in a portion (part A: heat dissipation part) in contact with the inclined surface.

따라서, 종래와 같이 용강의 중심부분에서 집중적인 열방출이 발생하지 않게 됨으로써 용강 중심부의 과냉이 방지된다.Therefore, intensive heat dissipation does not occur in the central portion of the molten steel as in the prior art, thereby preventing overcooling of the central molten steel.

이에 초주편의 폭방향 중심 부분에 고온의 미응고층이 형성되어 주조 진행시 표면의 냉각 수축에 의한 응력 발생시에도 내부 연성이 유지되고 있으므로 제품 표면에 크랙이 발생하는 것을 방지할 수 있게 된다.Accordingly, a high temperature non-solidified layer is formed at the center portion in the width direction of the ultra cast so that the internal ductility is maintained even when stress is generated due to the cooling shrinkage of the surface during casting, thereby preventing cracks from occurring on the surface of the product.

즉, 초기 연주시기가 경과하고 통상적인 연속주조가 진행될 때 주편내 온도 의 분포와 동일한 패턴의 온도분포를 형성할 수 있게 되는 것이다.In other words, it is possible to form a temperature distribution in the same pattern as the distribution of the temperature in the slab when the initial playing time has elapsed and the normal continuous casting is performed.

상기와 같이 초주편의 표면에 크랙이 발생하지 않게 됨으로써 제품의 표면 품질이 향상되는 효과가 있다.As described above, cracks do not occur on the surface of the ultra cast, thereby improving the surface quality of the product.

또한, 같은 이유에 의하여 초주편의 선단(종래 다량의 크랙이 발생하던 부분)을 절단하여 제거해야 할 필요가 없게 되므로 제품 회수율이 향상되는 효과가 있다.In addition, for the same reason, it is not necessary to cut and remove the tip (part where a large amount of crack has occurred) of the ultra-thin piece, thereby improving the product recovery rate.

상기와 같이, 상면이 오목한 형상의 더미바를 사용함으로써 초주편의 표면에 크랙이 발생하는 것을 방지할 수 있게 되는 바, 이는 초주편 표면에 크랙이 발생하기 쉬운 박슬라브 연속주조시 유용하다.As described above, it is possible to prevent the occurrence of cracks on the surface of the ultra-thin piece by using a dummy bar having a concave shape of the upper surface, which is useful during thin slab continuous casting is likely to crack on the surface of the ultra-thin piece.

한편, 상기 미응고층 형성에 의한 용강 유출 사고의 위험은 초주편의 몰드 내 체류 시간을 증가시키거나 또는 초기 냉각수량을 증가시킴으로써 회피할 수 있다.On the other hand, the risk of accidental leakage of the molten steel due to the formation of the non-solidified layer can be avoided by increasing the residence time of the outer cast in the mold or increasing the amount of initial cooling water.

도 1은 도 1은 몰드에 헤드가 삽입되어 있는 더미바의 개략도,1 is a schematic view of a dummy bar having a head inserted into a mold;

도 2는 상기 몰드내 용강과 더미바 헤드 사이의 열이동 모식도이다.2 is a schematic diagram of heat transfer between the molten steel in the mold and the dummy bar head.

*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

10 : 몰드 20 : 더미바10: mold 20: dummy bar

21 : 바디 22 : 헤드21: body 22: head

22a : 상면 30 : 러스트헤드22a: Top 30: Rust Head

31 : 돌기부 A : 열방출부31: projection A: heat dissipation unit

Claims (3)

바디와;Body; 상기 바디의 상부에 형성되어 연속주조 개시전 몰드의 하부에 삽입되며, 중심부가 오목한 형상으로 형성된 헤드;A head formed on an upper portion of the body and inserted into a lower portion of a mold before initiating continuous casting, and having a central portion formed in a concave shape; 를 포함하는 박슬라브 연속주조기의 더미바.Dummy bar of the thin slab continuous casting machine comprising a. 청구항 1에 있어서,The method according to claim 1, 상기 헤드의 상면은 중심부를 기준으로 양쪽에 경사면이 형성된 완만한 V자 형상으로 형성된 것을 특징으로 하는 박슬라브 연속주조기의 더미바.The upper surface of the head is a dummy bar of the thin slab continuous casting machine, characterized in that formed in a gentle V-shape formed on both sides with respect to the center. 청구항 1에 있어서,The method according to claim 1, 상기 헤드의 상면에, 상방으로 돌출 형성된 돌기부가 형성된 러스트헤드가 장착된 것을 특징으로 하는 박슬라브 연속주조기의 더미바.Dummy bar of the thin slab continuous casting machine, characterized in that the upper surface of the head, the rust head is formed with a protrusion formed protruding upward.
KR1020090046042A 2009-05-26 2009-05-26 Dummy-bar for the thinner-slab continuous casting apparatus KR20100127549A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111468691A (en) * 2020-06-12 2020-07-31 无锡隆达金属材料有限公司 Novel copper-nickel alloy semi-continuous round ingot casting dummy ingot head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111468691A (en) * 2020-06-12 2020-07-31 无锡隆达金属材料有限公司 Novel copper-nickel alloy semi-continuous round ingot casting dummy ingot head

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