KR100776043B1 - Asymmetrical melt feeding nozzle - Google Patents

Asymmetrical melt feeding nozzle Download PDF

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Publication number
KR100776043B1
KR100776043B1 KR1020060132830A KR20060132830A KR100776043B1 KR 100776043 B1 KR100776043 B1 KR 100776043B1 KR 1020060132830 A KR1020060132830 A KR 1020060132830A KR 20060132830 A KR20060132830 A KR 20060132830A KR 100776043 B1 KR100776043 B1 KR 100776043B1
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South Korea
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nozzle
roll
melt
molten metal
asymmetrical
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KR1020060132830A
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Korean (ko)
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안상호
박우진
정인호
추동균
홍성달
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주식회사 포스코
재단법인 포항산업과학연구원
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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
    • B22D11/10—Supplying or treating molten metal
    • 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
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
    • B22D21/04—Casting aluminium or magnesium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)

Abstract

A slit type nozzle for melt withdrawal is provided to reduce surface defects of a sheet by dispersing pressures applied to the melt by an upper roll and a lower roll instantaneously when melt is withdrawn from a nozzle. In a slit type nozzle for melt withdrawal for supplying melt between an upper roll(R1) and a lower roll(R2) to manufacture a metal sheet, an asymmetrical nozzle(20) for melt withdrawal is characterized in that the nozzle includes an upper nozzle(21) and a lower nozzle(22) having different lengths such that the upper and lower nozzles are formed in an asymmetrical shape, wherein a shortest distance between an end of a shorter one of the upper and lower nozzles and roll rips of the upper and lower rolls is not more than 0.5 mm.

Description

비대칭형 용탕인출용 노즐{Asymmetrical melt feeding nozzle}Asymmetrical melt feeding nozzle

도 1은 종래의 대칭형 노즐에 대한 개념도,1 is a conceptual diagram of a conventional symmetrical nozzle,

도 2는 본 발명의 비대칭형 노즐에 대한 개념도이다.2 is a conceptual diagram of an asymmetric nozzle of the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

10 : 종래의 대칭형 노즐 20 : 본 발명의 비대칭형 노즐10: conventional symmetric nozzle 20: asymmetric nozzle of the present invention

21 : 상부 노즐 22 : 하부 노즐21: upper nozzle 22: lower nozzle

R : 주조롤 R1 : 상부롤R: Casting Roll R1: Upper Roll

R2 : 하부롤R2: Lower Roll

본 발명은 용탕인출 직접주조에 사용되는 용탕인출용 슬릿형 노즐에 관한 것으로서, 특히 용탕인출 직접주조에 의해 제조되는 마그네슘 판재의 표면 결함을 획기적으로 저감시킬 수 있는 용탕인출용 슬릿형 노즐에 관한 것이다.The present invention relates to a slit nozzle for melt extraction, which is used for direct casting of molten metal, and more particularly, to a slit nozzle for melt extraction that can drastically reduce surface defects of a magnesium sheet produced by molten casting direct casting. .

일반적으로 마그네슘 합금은 현존하는 구조용 금속재료 중에서도 가장 가벼운 금속으로서 비강도가 우수한 합금으로 알려져 있으나, 육방정 결정구조의 특성상 성형이 까다로워 마그네슘 압연판재 및 압출재의 가격이 상당히 비싼 편이다. 최근에는 이러한 마그네슘 합금의 생산단가를 낮추기 위한 공정기술의 개발이 활발히 진행되고 있으며, 그 중에서도 회전하는 롤 사이로 용탕을 직접 주입함으로써 용탕으로부터 광폭의 판재를 직접 제조하는 직접 주조법이 주목받고 있다. 이 경우 별도의 압연, 압출공정이 생략될 수 있으므로 마그네슘 판재의 제조단가가 낮아질 뿐만 아니라 응고속도가 높아 합금특성이 향상되는 장점이 있다.In general, magnesium alloy is known as the lightest metal among the existing structural metal materials, and is known as an alloy having excellent specific strength, but due to the characteristics of hexagonal crystal structure, it is difficult to form magnesium rolled sheet and extruded material. Recently, development of a process technology for lowering the production cost of such magnesium alloys is actively progressed, and a direct casting method of directly manufacturing a wide plate from a molten metal by directly injecting a molten metal between rotating rolls is drawing attention. In this case, since a separate rolling and extrusion process may be omitted, not only the manufacturing cost of the magnesium plate is lowered but also the solidification rate is high, thereby improving alloy characteristics.

이러한 직접주조법에 의해 마그네슘 판재를 제조하기 위해서는 용탕을 용탕인출용 슬릿형 노즐을 통해 회전하는 두 개의 롤 사이로 균일하게 주입하여야 한다. 특히 상기 롤 사이로 용탕이 균일하게 주입되도록 하기 위해서는 용탕인출용 슬릿형 노즐이 회전하는 두 개의 롤 사이에 치밀하게 밀착 설치되도록 하여야 한다. 이러한 작업이 용이하게 실현되도록 하기 위해 통상적으로 도 1에 도시된 바와 같이 상하 대칭형 슬릿형 노즐이 사용되고 있다.In order to manufacture the magnesium sheet by the direct casting method, the molten metal must be uniformly injected between the two rolls rotating through the slit nozzle for the molten metal. In particular, in order to uniformly inject the molten metal between the rolls, the molten metal slit-shaped nozzle should be closely installed between the two rotating rolls. In order to easily realize such an operation, a vertically symmetrical slit nozzle is used as shown in FIG. 1.

그러나, 상기 도 1에 도시된 바와 같은 상하 대칭형 노즐이 사용될 경우 상기 노즐로부터 인출되는 용탕은 회전하는 상부롤과 하부롤에 의해 상하방향으로 가압되는 압축응력상태에 놓이게 된다. However, when the vertically symmetrical nozzle as shown in FIG. 1 is used, the melt drawn out from the nozzle is in a compressive stress state that is pressed upward and downward by the rotating upper and lower rolls.

상기 노즐을 통해 인출되는 용탕은 상부롤과 하부롤에 접촉하는 순간부터 용탕의 상하표면이 응고되면서 판재로 제조되기 시작하지만 판재의 내부는 여전히 미응고 상태이므로 다량의 액상이 상기 판재 내부에 잔존하는 반용융 상태가 된다.The molten metal drawn out through the nozzle starts to be manufactured as a plate as the upper and lower surfaces of the melt solidify from the moment of contact with the upper roll and the lower roll, but since the inside of the plate is still unsolidified, a large amount of liquid remains in the plate. It becomes semi-melt state.

이렇게 내부에 액상이 다량 존재하는 반용융 상태로 판재가 상부롤과 하부롤의 가장 간격이 좁은 부분 즉 롤 립(roll lip)을 통과하게 되면 상기 판재 내부의 액상이 상기 판재 표면으로 스며 나오게 되며, 이로 인해 각종 표면 결함이 유발된 다는 문제점이 있었다.When the sheet passes through the narrowest part of the upper roll and the lower roll, that is, the roll lip in a semi-melt state in which a large amount of liquid is present in the inside, the liquid inside the sheet leaks to the surface of the sheet. As a result, various surface defects were caused.

본 발명은 상술한 문제점을 해결하기 위한 것으로서 노즐로부터 용탕이 인출되는 순간 상부롤과 하부롤에 의해 가해지는 압력을 분산하여 상기 판재의 표면 결함을 저감할 수 있는 용탕인출용 슬릿형 노즐을 제공하는데 그 목적이 있다.The present invention has been made to solve the above-mentioned problems and to provide a slit-type nozzle for melt extraction which can reduce the surface defects of the plate material by dispersing the pressure applied by the upper roll and the lower roll at the moment the molten metal is withdrawn from the nozzle The purpose is.

상술한 목적은 상부 롤과 하부 롤 사이로 용탕을 공급하여 금속판재를 제조하는 용탕인출용 슬릿형 노즐로서, 상기 노즐의 상부 노즐 길이와 하부 노즐 길이가 상이하여 비대칭형상을 이루는 비대칭형 용탕인출용 노즐에 의해 달성될 수 있다.The above-mentioned object is a slit-type nozzle for melt extraction for supplying a molten metal between an upper roll and a lower roll to manufacture a metal sheet, and an asymmetric melt extraction nozzle having an asymmetric shape with different lengths of an upper nozzle and a lower nozzle of the nozzle. Can be achieved by

본 발명은 상술한 바와 같이 노즐의 상부 노즐 길이와 하부 노즐 길이가 상이하여 비대칭형상을 이루는 비대칭형 용탕인출용 노즐에 관한 것으로서, 이하 첨부된 도면을 통해 설명하기로 한다.As described above, the present invention relates to an asymmetric melt extraction nozzle having an asymmetrical shape in which the upper nozzle length and the lower nozzle length of the nozzle are different from each other, and will be described below with reference to the accompanying drawings.

첨부된 도 2에 도시된 바와 같이, 본 발명의 노즐(20)은 상부 노즐(21)과 하부 노즐(22)의 길이가 상이하여 비대칭 형상으로 형성되어 있다.As shown in FIG. 2, the nozzle 20 of the present invention is formed in an asymmetrical shape with different lengths of the upper nozzle 21 and the lower nozzle 22.

즉, 상기 상부 노즐(21)의 길이가 상기 하부 노즐(22)의 길이보다 짧은 비대칭 형상으로 인하여 상기 노즐(20)로부터 용탕이 인출되는 순간 상부롤(R1)과 하부롤(R2)에 의해 상기 용탕(혹은 반용융 판재)에 가해지는 압력은 상기 비대칭 형상의 상부 노즐(21)과 하부 노즐(22)의 구조에 의해 압력이 분산되고 이는 상기 상부롤(R1)과 하부롤(R2)에 의한 압력 또한 비대칭으로 작용된다는 것을 뜻한다.That is, due to the asymmetrical shape whose length of the upper nozzle 21 is shorter than the length of the lower nozzle 22, the upper roll R1 and the lower roll R2 are formed at the moment when the molten metal is withdrawn from the nozzle 20. Pressure applied to the molten metal (or semi-molten sheet) is dispersed by the structure of the upper nozzle 21 and the lower nozzle 22 of the asymmetric shape, which is caused by the upper roll R1 and the lower roll R2. Pressure also means that it is asymmetrical.

다시말해서 압력이 비대칭으로 작용된다는 것은 상기 압력이 상기 상부 노즐(21)과 하부 노즐(22)측으로 동일하게 작용되지 않고 본 실시예의 경우 길이가 짧은 상부 노즐(21)에 의해 압력이 분산되는 것이다.In other words, the pressure acting asymmetrically means that the pressure is not acted equally to the upper nozzle 21 and the lower nozzle 22 side, and in this embodiment, the pressure is dispersed by the short upper nozzle 21.

따라서, 본 발명의 노즐(20)로부터 용탕이 인출되는 순간 용탕(혹은 반용융 판재)에 작용하는 압력이 분산되고, 이에 의해 상기 용탕(혹은 반용융 판재) 내부로부터 액상이 표면으로부터 스며 나올 수 있는 가능성을 크게 감소시킬 수 있다.Therefore, the pressure acting on the molten metal (or semi-molten sheet) at the moment when the molten metal is withdrawn from the nozzle 20 of the present invention is dispersed, whereby liquid may bleed out from the surface of the molten metal (or semi-molten sheet). The likelihood can be greatly reduced.

이때, 상기 본 발명의 비대칭 용탕인출용 슬릿형 노즐(20)을 이용하면 상부롤(R1)과 하부롤(R2)에 의한 압축응력 즉 압력을 감소시킬 수 있는 장점이 있지만 노즐의 상하길이 편차가 증가하던가 혹은 노즐 끝단과 롤 립(roll lip)과의 거리가 증가하면 본 발명의 비대칭 노즐(20)의 짧은 측과 롤과 간격이 증가되면서 오히려 용탕이 역류할 수 있다.At this time, the use of the asymmetric melt extraction slit nozzle 20 of the present invention has the advantage of reducing the compressive stress, that is, the pressure due to the upper roll (R1) and the lower roll (R2), but there is a variation in the vertical length of the nozzle Increasing or increasing the distance between the nozzle end and the roll lip (roll lip) may increase the short side and the roll and the gap of the asymmetric nozzle 20 of the present invention, rather the molten metal can flow back.

따라서, 상기 용탕의 역류를 방지하면서 본 발명의 목적을 달성할 수 있도록 본 발명의 비대칭 용탕인출용 슬릿형 노즐(20)을 활용하기 위해서는 비대칭 노즐중 길이가 긴 부분, 즉 장측이 상기 롤 립을 지나치지 않도록 배치된 상태에서 짧은 측 즉, 단측의 노즐 끝단과 롤 립(roll lip)과의 간극이 0.5mm이하로 제한되어야 한다.Accordingly, in order to utilize the asymmetric melt-drawn slit nozzle 20 of the present invention so as to achieve the object of the present invention while preventing the reverse flow of the molten metal, a long part of the asymmetric nozzle, that is, the long side has the roll lip. The gap between the nozzle end on the short side, that is, the end side, and the roll lip should be limited to 0.5 mm or less while being disposed so as not to be excessive.

이러한 사실을 확인하기 위해 다음과 같은 실험을 수행하였다. 즉, 도 1에 도시된 바와 같은 종래의 대칭형 노즐(10)과 도 2에 도시된 발명의 노즐(20)의 표면결함 유발효과를 비교하기 위해 판재주조 실험을 수행하였다.In order to confirm this fact, the following experiment was conducted. That is, the sheet casting experiment was performed to compare the surface defect inducing effect of the conventional symmetrical nozzle 10 as shown in Figure 1 and the nozzle 20 of the invention shown in Figure 2.

이때 상기 대칭형 노즐(10)의 끝단과 롤과의 간격 그리고 본 발명의 비대칭 형 노즐(20)의 끝단과 롤과의 간격을 모두 0.3mm로 조절하였다.At this time, the distance between the end of the symmetrical nozzle 10 and the roll and the distance between the end and the roll of the asymmetric nozzle 20 of the present invention was adjusted to 0.3mm.

또한 마그네슘 용탕온도는 녹는점 온도보다 50도 높은 온도이었으며, 주조롤 즉 상기 상하부 롤(R1,R2)의 선속도는 10m/min으로 설정하였다.In addition, the magnesium molten metal temperature was 50 degrees higher than the melting point temperature, the linear speed of the casting rolls, that is, the upper and lower rolls (R1, R2) was set to 10m / min.

상술한 바와 같이 표면결함 유발효과를 관찰하기 위한 판재주조 시험결과, 종래의 대칭형 노즐(10)의 경우 상부롤(R1)과 하부롤(R2)의 가압에 의해 판재내부의 미응고 액상이 표면으로 스며나오는 이른바 역편석 현상에 의한 표면 결함이 발생되었으나, 본 발명의 비대칭 노즐(20)을 이용한 경우 역편석에 의한 표면 결함이 발생되지 않았다.As a result of the sheet casting test for observing the effect of causing surface defects as described above, in the case of the conventional symmetrical nozzle 10, the non-solidified liquid inside the plate is pressed to the surface by pressing the upper roll R1 and the lower roll R2. Surface defects due to the so-called reverse segregation occurred, but surface defects due to reverse segregation did not occur when the asymmetric nozzle 20 of the present invention was used.

한편 본 발명의 비대칭형 노즐(20)의 끝단과 롤과의 설치간격 조건을 도출하기 위한 시험을 수행하였다.On the other hand, a test was conducted to derive the installation interval condition between the end of the asymmetric nozzle 20 and the roll of the present invention.

이때, 본 발명의 비대칭형 노즐(20) 중 긴 부분 즉 장측의 끝단은 상기 롤의 롤 립을 지나치지 않도록 배치되었으며, 짧은 측 즉, 단측의 끝단과 롤과의 간격은 0.05mm 내지 0.8mm까지 0.05mm간격으로 변화시키면서 용탕의 역류 발생 여부를 확인하였다.At this time, the long part of the asymmetric nozzle 20 of the present invention, that is, the end of the long side is disposed so as not to pass the roll lip of the roll, the short side, that is, the distance between the end of the end and the roll is 0.05mm to 0.8mm It was confirmed whether the reverse flow of the molten metal while changing to the mm interval.

이러한 시험을 수행한 결과 0.5mm까지는 용탕의 역류가 관찰되지 않았고 원활하게 판재주조가 진행되었으나, 그 이상의 간격에서는 용탕의 역류가 관찰되었다.As a result of this test, no reverse flow of the molten metal was observed up to 0.5 mm and smooth casting of the sheet was performed, but a reverse flow of the molten metal was observed at a longer interval.

이상과 같이 종래의 슬릿형 노즐은 상하부롤에 의한 압력으로 인해 반용융 판재에 역편석으로 인한 표면 결함이 발생하는 문제점이 있었으나,As described above, the conventional slit nozzle has a problem in that the surface defects due to reverse segregation in the semi-molten sheet due to the pressure of the upper and lower rolls,

본 발명의 경우 상하 길이가 상이한 비대칭형 노즐을 사용함에 의해 압력이 분산되어 상술한 바와 같은 표면 결함이 발생하지 않는 효과가 있다. In the case of the present invention, the pressure is dispersed by using asymmetric nozzles having different vertical lengths, so that the surface defects as described above do not occur.

Claims (2)

상부 롤과 하부 롤 사이로 용탕을 공급하여 금속판재를 제조하는 용탕인출용 슬릿형 노즐에 있어서,In the slit-shaped nozzle for melt extraction to supply the molten metal between the upper roll and the lower roll to produce a metal sheet material, 상기 노즐의 상부 노즐 길이와 하부 노즐 길이가 상이하여 비대칭형상을 이루는 것을 특징으로 하는 비대칭형 용탕인출용 노즐.An asymmetric melt take-out nozzle, characterized in that the upper nozzle length and the lower nozzle length of the nozzle to form an asymmetric shape. 제1항에 있어서,The method of claim 1, 상기 노즐 중 짧은 측 끝단과 상기 상하부 롤의 롤 립과의 최단거리가 0.5mm이하인 것을 특징으로 하는 비대칭형 용탕인출용 노즐.And a shortest distance between the short side end of the nozzles and the roll lip of the upper and lower rolls is 0.5 mm or less.
KR1020060132830A 2006-12-22 2006-12-22 Asymmetrical melt feeding nozzle KR100776043B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0233147A1 (en) 1986-02-13 1987-08-19 Larex Ag Method and apparatus for continuous twin-roll casting
EP0352353A1 (en) 1988-07-28 1990-01-31 INTRACON Handelsgesellschaft für Industriebedarf mbH Ladle nozzle brick for a closure device of a ladle
KR100654889B1 (en) 2005-06-13 2006-12-06 주식회사 포스코 Nozzle for continuous casting

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0233147A1 (en) 1986-02-13 1987-08-19 Larex Ag Method and apparatus for continuous twin-roll casting
EP0352353A1 (en) 1988-07-28 1990-01-31 INTRACON Handelsgesellschaft für Industriebedarf mbH Ladle nozzle brick for a closure device of a ladle
KR100654889B1 (en) 2005-06-13 2006-12-06 주식회사 포스코 Nozzle for continuous casting

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