KR100829951B1 - Casting roll for mg slab manufacturing - Google Patents

Casting roll for mg slab manufacturing Download PDF

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Publication number
KR100829951B1
KR100829951B1 KR1020060131407A KR20060131407A KR100829951B1 KR 100829951 B1 KR100829951 B1 KR 100829951B1 KR 1020060131407 A KR1020060131407 A KR 1020060131407A KR 20060131407 A KR20060131407 A KR 20060131407A KR 100829951 B1 KR100829951 B1 KR 100829951B1
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South Korea
Prior art keywords
roll
casting
slab
cast
casting rolls
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KR1020060131407A
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Korean (ko)
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추동균
성환진
박우진
정인호
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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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/005—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of rolls, wheels or the like
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • 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)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Abstract

Casting rolls for manufacturing of a Mg slab are provided to manufacture a slab with a constant thickness when casting a magnesium alloy. In a pair of casting rolls for producing a slab while cooling molten metal supplied through a nozzle, casting rolls for manufacturing of a Mg slab is characterized in that the casting rolls are formed to distribute roughness of the casting rolls to a roll roughness range of 0.5 to 20 mum in the width direction of the rolls such that the casting rolls obtain a positive crown to a roll roughness range of about 20 to 100 mum that is a range suitable for performing post-treatment rolling of wedge and crown portions of the slab, wherein edges of the casting rolls have a low roll roughness range while a central portion of the casting rolls has a high roll roughness range.

Description

마그네슘 주편 제조용 주조롤{Casting roll for Mg slab manufacturing}Casting roll for Mg slab manufacturing

도 1은 박판 주조과정을 나타낸 개략도.1 is a schematic view showing a thin plate casting process.

도 2는 박판 주조시 롤표면과 접촉되는 주편의 응고을 나타낸 단면도.2 is a cross-sectional view showing the solidification of the cast slab in contact with the roll surface during sheet casting.

도 3은 박판 주소시 주편 응고각 분포를 나타낸 개락도.Fig. 3 is a schematic diagram showing the distribution of cast solidification at the time of thin plate address.

도 4는 주편 두께 프로파일 정의를 나타낸 모식도.4 is a schematic diagram showing the cast thickness profile definition.

도 5는 조도 가공된 롤 표면의 상태를 나타낸 평면도.The top view which shows the state of the roughened roll surface.

도 6은 본 발명의 롤 폭방향 조도 분포, 롤 크라운 및 주편 두께 분포를 나타낸 그래프.Figure 6 is a graph showing the roll width direction roughness distribution, roll crown and cast thickness distribution of the present invention.

※도면의 주요부분에 대한 부호의 설명※※ Explanation of symbols about main part of drawing ※

1, 1 ': 주조롤1, 1 ': casting roll

2 : 노즐2: nozzle

4 : 용탕4: molten metal

5 : 주편 5: cast

본 발명은 마그네슘 주편 제조용 주조롤에 관한 것으로서, 더욱 상세하게는 비철 금속과 그 합금을 용탕에서 직접 박판으로 제조하는 박판 주조 공정시 비철 금속 중에서 산화성 및 폭발성이 있는 마그네슘 합금의 주편을 제조할 수 있는 마그네슘 주편 제조용 주조롤에 관한 것이다.The present invention relates to a casting roll for manufacturing magnesium slab, and more particularly, to manufacture a cast of magnesium alloy having oxidative and explosive properties in a nonferrous metal during a thin plate casting process of manufacturing a non-ferrous metal and its alloy directly from molten metal. It relates to a casting roll for producing magnesium cast steel.

종래의 마그네슘(Mg)박판 주조법에서는 박판을 용탕으로부터 직접 제조하기 위해 도 1에 나타낸 바와 같이 용탕주입용 노즐(2)을 통해 배출되는 마그네슘 용탕(4)을 한 쌍의 주조롤(1)(1') 사이에 공급하여 용탕 주입부 노즐 셋백(set back)을 형성하고, 응고 직전의 미응고부가 주조롤(1)(1')에 의해 냉각되면서 응고하여 박판 주편(5)을 제조하고 있다.In the conventional magnesium (Mg) thin plate casting method, a pair of casting rolls (1) (1) of magnesium molten metal (4) discharged through the molten metal injection nozzle (2) as shown in FIG. And the molten metal injection part nozzle set back is formed, and the non-solidified part immediately before solidification is solidified while cooling by the casting roll 1 (1 '), and the thin slab 5 is manufactured.

한편, 종래의 박판 주조 기술에서는 도 2에 나타낸 바와 같이 용탕이 롤과 접촉하여 롤 폭에 걸쳐 주편 응고각을 형성하고, 주편 응고각 두께가 점차 두꺼워지면서 판두께 형상을 만든다. On the other hand, in the conventional sheet metal casting technique, as shown in FIG. 2, the molten metal contacts the roll to form the slab solidification angle over the roll width, and the slab solidification angle becomes thicker to form a plate thickness shape.

그러나 종래의 박판 주조기에서는 롤표면에 주편의 롤표면 부착 현상이 일어나지 않도록 롤 연마시의 조도를 그대로 사용하고, 롤조도가 폭 방향으로 동일하므로 주편 두께 형상은 롤 열변형 및 롤 기계적 변형의 합에 의해 결정된다. 따라서 주편 두께 형상이 향후의 압연을 위해 바람직한 형상으로 제조되지 못하는 문제점이 있었다.However, in the conventional sheet casting machine, the roughness of roll polishing is used as it is so as not to cause roll surface adhesion of the cast on the roll surface, and since the roll roughness is the same in the width direction, the thickness of the cast steel is the sum of the roll thermal deformation and roll mechanical deformation. Is determined by Therefore, there was a problem that the cast steel thickness shape is not manufactured to the desired shape for future rolling.

즉, 종래와 같이 주편의 조도를 일정하게 주조하는 경우에는 주편 두께 형상은 단지 롤 열변형 및 롤 기계적 변형에 의한 롤 갭 형상에 의해 수동적으로 결정된다. That is, in the case of casting the roughness of the cast steel constantly as in the prior art, the cast steel thickness shape is manually determined only by the roll gap shape due to the roll thermal deformation and the roll mechanical deformation.

그러나 이와 같이 결정된 주편 두께 형상이 가운데가 볼록한 형태를 갖지 못 하는 경우에는 주편의 후처리 가공을 위한 압연 작업시 주편 판폭 방향으로 불균일한 압연이 발생되거나 심한 경우 판 파단이 발생되어 심각한 설비 사고가 발생되는 문제점이 있었다.However, in the case where the determined thickness of the cast steel does not have a convex shape in the middle, uneven rolling occurs in the slab width direction during rolling work for the post-processing of the cast steel, or severe fracture of the plate causes severe equipment accidents. There was a problem.

본 발명은 상기한 문제점을 해결하기 위하여 발명한 것으로서, 그 목적은 마그네슘 합금의 주조시 주편의 두께를 일정하게 제조할 수 있는 마그네슘 주편 제조용 주조롤을 제공함에 있다.The present invention has been made to solve the above problems, an object of the present invention is to provide a casting roll for manufacturing magnesium slab that can produce a constant thickness of the cast steel during casting of the magnesium alloy.

상기 목적을 달성하기 위한 본 발명의 특징적인 구성을 설명하면 다음과 같다.Referring to the characteristic configuration of the present invention for achieving the above object is as follows.

본 발명의 마그네슘 주편 제조용 주조롤은 노즐을 통하여 공급되는 용탕을 냉각시키면서 주편을 생산하는 한 쌍의 주조롤에 있어서, 상기 주조롤은 주편 웨지 및 크라운이 후처리 압연하기에 양호한 범위인 약 20um ~ 100um 범위까지 양의 크라운이 될 수 있도록, 롤 폭방향으로 롤 조도 범위는 0.5um ~ 20um 범위까지 분포되도록 하되, 에지는 작게, 중심부는 크게 조도 가공하여서 된 것이다.In the cast roll for manufacturing magnesium slab of the present invention is a pair of casting rolls to produce the cast while cooling the molten metal supplied through the nozzle, the casting roll is about 20um ~ the range that the cast wedge and crown is good for post-process rolling In order to be a positive crown up to the 100um range, the roll roughness range is distributed in the range of 0.5um to 20um in the roll width direction, but the edge is small and the center is roughened.

이와 같은 특징을 갖는 본 발명을 상세하게 설명하면 다음과 같다.Referring to the present invention having such characteristics in detail as follows.

본 발명은 박판 주조시 주편의 응고가 시작되는 주입용 노즐(2)과 주조롤(1) (1') 사이에서 주조되는 박판의 두께 형상을 폭 방향으로 양호하게 제조하기 위한 것이다.The present invention is for producing the thickness shape of the thin plate cast between the injection nozzle (2) and the casting roll (1) (1 ') that the solidification of the cast during the thin plate casting starts in the width direction.

즉, 용탕(4)을 노즐(2)을 통해 롤닙으로 공급하면서 주조를 하는 경우 후처리 압연 작업을 용이하게 하고, 제품에서 양호한 두께 형상 품질을 얻기 위해서 주편 두께 형상을 제어하는 것이다.That is, when casting while supplying the molten metal 4 to the roll nip through the nozzle 2, post-process rolling operation is facilitated and cast thickness shape is controlled in order to obtain favorable thickness shape quality in a product.

따라서, 본 발명에서는 롤표면의 조도를 폭 방향으로 일정한 곡선을 따라 분포를 가지게 함으로써 롤 조도에 따른 롤 열변형 발생을 주편 두께 형상에 적극적으로 이용하는 것이다.Therefore, in the present invention, the roughness of the roll surface is distributed along a constant curve in the width direction to actively use the generation of roll thermal deformation according to the roll roughness for the thickness of the cast steel.

이러한 본 발명을 첨부 도면에 의해 설명하면 다음과 같다.The present invention will be described with reference to the accompanying drawings.

먼저, 종래에는 도 5에 나타낸 바와 같이 주조롤(1)(1')을 일정한 크기의 조도로 가공하고 있으나, 본 발명에서는 도 6에 나타낸 바와 같이 롤 폭에 걸쳐 조도 분포가 일정한 곡선을 따르도록 함으로써 롤조도 분포에 따른 열변형 특성을 이용할 수 있다. First, as shown in FIG. 5, the casting rolls 1 and 1 ′ are processed with a constant size of roughness. However, in the present invention, as shown in FIG. 6, the roughness distribution has a constant curve over the roll width. Thereby, the heat distortion characteristic according to roll roughness distribution can be utilized.

즉, 도 6에 나타낸 바와 같이 롤 조도를 에지부에는 작게하고 중심부로 갈수록 점차 증가시키면 조도가 작은 부분에서는 응고가 빨리 일어나게 되어 롤 내부로의 열흡수량이 커지므로 롤 열팽창이 많아진다.That is, as shown in Fig. 6, when the roll roughness is made smaller at the edge portion and gradually increased toward the center portion, solidification occurs quickly at the portion where the roughness is small, so that the heat absorption into the roll increases, so that the roll thermal expansion increases.

한편, 조도가 큰 곳에서는 응고가 느리게 일어나므로 롤 열부하가 작아져 롤 열 팽창량이 작게된다. On the other hand, in the case where the roughness is large, solidification occurs slowly, so that the roll heat load is small, so that the roll thermal expansion amount is small.

따라서 롤 크라운은 에지부가 높아지고 중심부가 낮아지는 형상을 나타내며, 이러한 롤 2개가 쌍을 이뤄 주편 응고각을 생성하면 주편 두께 형상은 가운데가 볼록하고, 양쪽이 두께가 작아지는 양의 크라운 형상을 하게 된다. 이와 같이 양의 크라운을 가진 주편을 후처리 압연하면 압연 작업성이 양호하고, 제품 두께 형상이 양호한 품질을 얻게 된다. Therefore, the roll crown has a shape in which the edge portion is increased and the center portion is reduced. When these two rolls are paired to generate the slag solidification angle, the thickness of the slab is convex in the center, and both sides have a positive crown shape. . When the cast steel having a positive crown is post-processed rolled in this manner, the rolling workability is good and the product thickness shape is obtained with good quality.

도 6에 나타낸 바와 같이 롤 폭방향으로 롤 조도를 분포하는 경우는 롤 조도 범위를 0.5um ~20um 범위까지 에서 도 4에서 정의한 주편 웨지 및 크라운이 후처리 압연하기에 양호한 범위인 약 20um ~ 80um 범위까지 양의 크라운이 되는 조건으로 주조될 수 있도록 적정한 조도 가공 칫수를 결정하여 조도 가공을 실시한다. As shown in FIG. 6, in the case of distributing roll roughness in the roll width direction, the range of roll roughness from 0.5um to 20um is in the range of about 20um to 80um, in which the cast wedge and crown defined in FIG. Roughness processing is performed by determining the appropriate roughness dimension so that it can be cast under the condition of being a positive crown.

이상과 같이 마그네슘 박판 주조 시 주편에 약 20um ~ 100um 범위 이내의 웨지 및 양의 크라운을 얻기 위해 롤표면에 0.5um ~20um 의 조도를 에지를 작게, 중심부를 크게 하여 가공한 결과 주조된 주편의 웨지 및 크라운이 양호한 주편을 확보할 수 있었다. As mentioned above, in order to obtain wedges within the range of about 20 μm to 100 μm and positive crowns on the cast steel sheet, the wedge of the cast slab is obtained by processing the roughness of 0.5 μm to 20 μm on the roll surface with small edges and increasing the center. And the crown was able to secure a favorable cast.

이와 같이 본 발명은 마그네슘 박판 주조 시 롤 표면 조도를 일정한 곡선 형상으로 가공된 주조롤에 의해서 주편의 두께 편차를 방지함은 물론, 이러한 주편을 이용하여 후처리 압연 시 압연 작업성이 양호하게 되는 특유의 효과가 있다.As such, the present invention prevents the thickness variation of the cast slab by the cast roll processed to a constant curved shape of the roll surface roughness when casting magnesium thin plate, as well as the rolling workability during post-treatment rolling using such cast slab. Has the effect of.

Claims (2)

노즐(2)을 통하여 공급되는 용탕(4)을 냉각시키면서 주편을 생산하는 한 쌍의 주조롤(1)(1')에 있어서, In a pair of casting rolls (1) (1 ') for producing cast steel while cooling the molten metal (4) supplied through the nozzle (2), 상기 주조롤(1)(1')은 주편 웨지 및 크라운이 후처리 압연하기에 양호한 범위인 약 20um ~ 100um 범위까지 양의 크라운이 될 수 있도록, 롤 폭방향으로 롤 조도 범위는 0.5um ~ 20um 범위까지 분포되도록 하되, 에지는 작게, 중심부는 크게 조도 가공함을 특징으로 하는 마그네슘 제조용 주조롤.The casting roll (1) (1 ') is 0.5um ~ 20um roll roughness range in the roll width direction so that the cast wedge and crown can be a positive crown in the range of about 20um ~ 100um, which is a good range for post-process rolling The cast roll for manufacturing magnesium, characterized in that to be distributed to a range, but the edge is small, the center is roughness processing. 삭제delete
KR1020060131407A 2006-12-20 2006-12-20 Casting roll for mg slab manufacturing KR100829951B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011050417A1 (en) * 2009-10-30 2011-05-05 Bluescope Steel Limited Method and apparatus for controlling variable shell thickness in cast strip
KR101296113B1 (en) 2009-12-17 2013-08-19 주식회사 포스코 An apparatus and method for controlling wedge of strip in twin roll strip casting process
KR101356770B1 (en) 2011-12-28 2014-01-28 재단법인 포항산업과학연구원 Method of working casting roll profile for magnesium strip casting

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Publication number Priority date Publication date Assignee Title
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JPH05220547A (en) * 1992-02-14 1993-08-31 Nippon Steel Corp Method for estimating plate crown in twin roll type strip continuous casting and continuous casting
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Cited By (15)

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US8960265B2 (en) * 2009-10-30 2015-02-24 Nucor Corporation Method and apparatus for controlling variable shell thickness in cast strip
AU2010312330B2 (en) * 2009-10-30 2016-05-26 Nucor Corporation Method and apparatus for controlling variable shell thickness in cast strip
EP2493642A1 (en) * 2009-10-30 2012-09-05 Nucor Corporation Method and apparatus for controlling variable shell thickness in cast strip
CN102712035A (en) * 2009-10-30 2012-10-03 纽科尔公司 Method and apparatus for controlling variable shell thickness in cast strip
EP3753648A1 (en) * 2009-10-30 2020-12-23 Nucor Corporation Method and apparatus for controlling variable shell thickness in cast strip
AU2016203488B2 (en) * 2009-10-30 2018-05-17 Nucor Corporation Method and apparatus for controlling variable shell thickness in cast strip
US20110108228A1 (en) * 2009-10-30 2011-05-12 Nucor Corporation Method and apparatus for controlling variable shell thickness in cast strip
EP2493642A4 (en) * 2009-10-30 2015-03-11 Nucor Corp Method and apparatus for controlling variable shell thickness in cast strip
WO2011050417A1 (en) * 2009-10-30 2011-05-05 Bluescope Steel Limited Method and apparatus for controlling variable shell thickness in cast strip
CN102712035B (en) * 2009-10-30 2015-07-15 纽科尔公司 Method and apparatus for controlling variable shell thickness in cast strip
US8960264B2 (en) 2009-10-30 2015-02-24 Nucor Corporation Method and apparatus for controlling variable shell thickness in cast strip
US9744589B2 (en) 2009-10-30 2017-08-29 Nucor Corporation Method and apparatus for controlling variable shell thickness in cast strip
KR101776831B1 (en) 2009-10-30 2017-09-08 누코 코포레이션 Method and apparatus for controlling variable shell thickness in cast strip
KR101296113B1 (en) 2009-12-17 2013-08-19 주식회사 포스코 An apparatus and method for controlling wedge of strip in twin roll strip casting process
KR101356770B1 (en) 2011-12-28 2014-01-28 재단법인 포항산업과학연구원 Method of working casting roll profile for magnesium strip casting

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