JPH0626757B2 - How to narrow down belt casters - Google Patents

How to narrow down belt casters

Info

Publication number
JPH0626757B2
JPH0626757B2 JP13220388A JP13220388A JPH0626757B2 JP H0626757 B2 JPH0626757 B2 JP H0626757B2 JP 13220388 A JP13220388 A JP 13220388A JP 13220388 A JP13220388 A JP 13220388A JP H0626757 B2 JPH0626757 B2 JP H0626757B2
Authority
JP
Japan
Prior art keywords
slab
dam block
belt
caster
narrowing
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
JP13220388A
Other languages
Japanese (ja)
Other versions
JPH01306051A (en
Inventor
敏彦 村上
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP13220388A priority Critical patent/JPH0626757B2/en
Publication of JPH01306051A publication Critical patent/JPH01306051A/en
Publication of JPH0626757B2 publication Critical patent/JPH0626757B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637Accessories therefor
    • B22D11/0648Casting surfaces
    • B22D11/066Side dams

Landscapes

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

Description

【発明の詳細な説明】Detailed Description of the Invention 【産業上の利用分野】[Industrial applications]

この発明は薄板連続鋳造用のツインベルトキャスターの
鋳片絞り込み方法に係り、キャスター内での鋳片冷却の
不均一を防止するための鋳片絞り込み方法に関する。
The present invention relates to a slab narrowing method for twin belt casters for continuous casting of thin plates, and more particularly to a slab narrowing method for preventing uneven cooling of the slab in the caster.

【従来の技術】 第6図は一般的なツインベルトキャスター方式の鋳造設
備を示すもので、上下各プーリ(2)(3)の回転により移動
する無端ベルト(1)(11)と、上下ベルト間に挟まれ同調
回転するダムブロック(4)により構成され、このベルト
キャスターの上下無端ベルト間にタンディッシュ(5)よ
り溶融金属(6)を注入し、無端ベルト(1)(11)の移動とと
もにその注入された溶融金属(6)を順次冷却凝固させ、
凝固した薄鋳片(7)をピンチロール(図示せず)にて連
続的に引抜く方式である。 このベルトキャスターのダムブロック(4)は第7図に示
すごとく、ストラップ(8)によりエンドレスに継ぎ合さ
れており、鋳造時上ベルト(1)と下ベルト(11)の側部間
に挟持された状態で移動する。 溶融金属はこの上下の無端ベルト(1)(11)とダムブロッ
ク(4)で構成された空間内で凝固冷却されつつ鋳片とし
て引抜かれる。このため、このベルトキャスター方式に
は以下に示すような問題が生じる。 すなわち、溶融金属が上下の無端ベルトとダムブロック
とで構成される空間内で凝固冷却されて熱収縮すること
により、上ベルト(1)と下ベルト(11)間、およびダムブ
ロックとの間に隙間が生じる。しかし、鋳片(7)は自重
により下ベルト(11)上に接触するため、隙間はすべて鋳
片と上ベルトとの間と、鋳片とダムブロックとの間に生
じる。このため、鋳片上面および側面(鋳片短片)は冷
却が不十分となり、かつ復熱によって鋳片温度が上昇
し、高速鋳造時のブレークアウト等の問題を生じる。 かかる対策として、鋳片幅方向の絞り込みは例えば第8
図に示すごとくキャスターの入側および出側を直線的に
結ぶダムブロック(4)を支持するサイドガイド(9)を絞り
込む方法(特願昭61-102719号等)が既に開発されてい
るが、厚み方向の絞り込みはキャスター入側部と出側部
が同一間隔であり、ダムブロックの厚みを変えることが
できないため、従来の厚み方向の絞り込み方法として
は、第9図に示すごとくベルトを支えるバックアップロ
ール(12)に対し荷重Fをかけて撓みδを生じさせ中央部
を張り出させて絞り込む方法が一般的であった。
2. Description of the Related Art FIG. 6 shows a general twin-belt caster type casting equipment. Endless belts (1) and (11) that move by rotation of upper and lower pulleys (2) and (3), and upper and lower belts. It consists of a dam block (4) that is sandwiched between them and rotates synchronously.Melted metal (6) is injected from the tundish (5) between the upper and lower endless belts of this belt caster to move the endless belts (1) (11). With that, the injected molten metal (6) is sequentially cooled and solidified,
This is a method of continuously pulling out the solidified thin slab (7) with a pinch roll (not shown). The dam block (4) of this belt caster is endlessly joined by a strap (8) as shown in Fig. 7, and is clamped between the upper belt (1) and the lower belt (11) during casting. Move in the open state. The molten metal is solidified and cooled in the space formed by the upper and lower endless belts (1) and (11) and the dam block (4), and is withdrawn as a slab. Therefore, this belt caster system has the following problems. That is, the molten metal is solidified and cooled in the space composed of the upper and lower endless belts and the dam block and heat-contracted, so that between the upper belt (1) and the lower belt (11) and between the dam block. There is a gap. However, since the slab (7) contacts the lower belt (11) by its own weight, all gaps are formed between the slab and the upper belt and between the slab and the dam block. For this reason, the upper surface and the side surface (short piece of the slab) of the slab become insufficiently cooled, and the temperature of the slab rises due to recuperation, which causes a problem such as breakout during high-speed casting. As a countermeasure against this, the narrowing in the width direction of the slab is, for example, the eighth
As shown in the figure, a method (Japanese Patent Application No. 61-102719, etc.) for narrowing down the side guide (9) that supports the dam block (4) that linearly connects the caster's inlet side and outlet side has already been developed. The thickness of the dam block cannot be changed because the caster inlet side and outlet side have the same spacing in the thickness direction, so the conventional thickness direction narrowing method is to back up the belt as shown in Fig. 9. A general method is to apply a load F to the roll (12) to generate a bending δ and to project the central portion to narrow it down.

【発明が解決しようとする課題】[Problems to be Solved by the Invention]

しかし、バックアップロールを撓ませて鋳片厚み方向の
絞り込みを行なう方法では、鋳片中央部が接触する程度
で幅方向全体にわたって上ベルトを接触させて冷却する
ことは困難であり、鋳片上面の冷却を完全に行なうこと
は不可能であった。 したがって、従来は鋳片上下面の温度不均一が生じるの
を余儀なくされ、ブレークアウト等の問題を完全に解決
することができなかった。 この発明は従来の技術のこのような問題点に鑑みなされ
たものであり、その目的とするところは鋳片上面の冷却
能アップと上下面の不均一冷却を緩和し得る鋳片厚み方
向の絞り込み方法を提案しようとするものである。
However, in the method of bending the backup roll and narrowing it down in the thickness direction of the slab, it is difficult to bring the upper belt into contact with the entire width direction to cool the slab at the center of the slab. It was impossible to achieve complete cooling. Therefore, conventionally, the temperature nonuniformity of the upper and lower surfaces of the slab has been forced to occur, and the problems such as breakout could not be completely solved. The present invention has been made in view of such problems of the prior art, and an object thereof is to improve the cooling capacity of the upper surface of the slab and to reduce the uneven cooling of the upper and lower surfaces in the thickness direction of the slab. It is intended to propose a method.

【課題を解決するための手段】[Means for Solving the Problems]

この発明に係るベルトキャスターの絞り込み方法は、ダ
ムブロックの形状を変えるとともに該ダムブロックを傾
動させることによってダムブロック間隔を変え厚み方向
の絞り込みを行なう方法であり、その要旨はダムブロッ
ク上面を円弧状に形成し、かつ鋳片に接する側の下面と
下ベルトとの間にギャップを設け、幅方向の絞り込みと
同時に該ダムブロックを鋳片側に傾動させることによ
り、上ベルトとダムブロック間に生じる隙間分だけ厚み
方向の絞り込みを行なうことを特徴とするベルトキャス
ターの絞り込み方法にある。
The method of narrowing down a belt caster according to the present invention is a method of changing the shape of a dam block and tilting the dam block to change the distance between the dam blocks to narrow down in the thickness direction. A gap is formed between the lower belt and the lower surface on the side in contact with the slab, and the dam block is tilted toward the slab simultaneously with the narrowing in the width direction. There is a method of narrowing down a belt caster characterized by narrowing down in the thickness direction.

【作用】[Action]

第1図はこの発明方法を実施するためのダムブロックの
形状を示す縦断面図、第2図は同上ダムブロックを傾動
させた状態を示す縦断面図である。 すなわち、この発明で用いるダムブロック(14)は該ブロ
ック上面を半径Rの円弧面(14-1)とし、かつ傾動用の
サイドガイドローラ(13)にて押圧した際に該ダムブロッ
クが傾動しやすいように半径Rで円弧面(14-2)として
ギャップCを設けている。 上記ギャップCは通常溶融金属が差込まない程度に設
けるもので、具体的には0.1〜0.3mm程度とし、かつ上ベ
ルト(1)と接した時鋳片側にダムブロック(14)が自然に
傾動しないように半径Rの中心をダムブロック中心か
らdだけ位置をずらして設ける。 このダムブロックによる絞り込み方法は、第1図の状態
でダムブロック(14)をセットしておき、サイドガイドロ
ーラ(13)を押込んでダムブロックを傾動させる。この
時、サイドガイドローラ(13)の押込み力が不足しても、
ダムブロックの上下面の対向角が円弧面となっているの
で、容易に傾動する。 サイドガイドローラの押込みによりダムブロックはC
分だけ傾動し、上面の円弧面(14-1)と上ベルト(1)との
間に隙間dが生じる。つまり、この隙間d分だけ厚
み方向に絞り込まれたことになるのである。 第3図はこの発明の絞り込み方法を示す説明図であり、
図(A)は第6図A部(メニスカス中央)の位置、図
(B)は第6図B部の位置(上ベルトと溶融金属の接触
位置)、図(C)は第6図C部(凝固殻が完全にできた
位置)をそれぞれ示す。 すなわち、第6図A部の位置においてはダムブロック(1
4)は傾動前の状態にあり、ダムブロックの上面は円弧面
(14-1)の鋳片側端部が上ベルト(1)と接触した状態にあ
る。 そして、上ベルト(1)と溶融金属(6)とが接触する湯境部
直後からダムブロック(14)をサイドガイドローラ(13)に
て押込み、この押込みにより短辺側凝固殻(6-1)が押込
まれることによって鋳片が幅方向に絞り込まれる(第6
図B部)。 第6図C部ではさらにダムブロック(14)が傾動すること
によって短辺側凝固殻(6-1)が押込まれるので、鋳片が
厚み方向に絞り込まれ、上面側凝固殻(6-2)と上ベルト
(1)との隙間d分厚み方向に絞り込まれる。
FIG. 1 is a longitudinal sectional view showing the shape of a dam block for carrying out the method of the present invention, and FIG. 2 is a longitudinal sectional view showing a state in which the dam block is tilted. That is, the dam block (14) used in the present invention has the upper surface of the block as an arcuate surface (14-1) having a radius R 1 and tilts when pressed by the tilting side guide roller (13). The gap C 1 is provided as an arc surface (14-2) with a radius R 2 so as to facilitate the operation. The above-mentioned gap C 1 is usually provided to the extent that molten metal is not inserted. Specifically, it is about 0.1 to 0.3 mm, and when contacting the upper belt (1), the dam block (14) is naturally formed on the slab side. The center of the radius R 1 is provided so as to be displaced from the center of the dam block by d so as not to tilt. In this narrowing method using a dam block, the dam block (14) is set in the state shown in FIG. 1, and the side guide roller (13) is pushed in to tilt the dam block. At this time, even if the pushing force of the side guide roller (13) is insufficient,
Since the upper and lower surfaces of the dam block have arcuate facing angles, they easily tilt. The dam block is C 2 by pushing the side guide roller.
It tilts by an amount, and a gap d 1 is formed between the upper arc surface (14-1) and the upper belt (1). That is, this means that the gap d 1 is narrowed down in the thickness direction. FIG. 3 is an explanatory view showing a narrowing method of the present invention,
Figure (A) is the position of Figure 6A part (center of the meniscus), Figure (B) is the position of Figure 6B (contact position of the upper belt and molten metal), Figure (C) is Figure 6C part. (The position where the solidified shell is completely formed) is shown. That is, the dam block (1
4) is in the state before tilting, the upper surface of the dam block is an arc surface
The end on the cast piece side of (14-1) is in contact with the upper belt (1). Then, the dam block (14) is pushed in by the side guide rollers (13) immediately after the molten metal contact portion where the upper belt (1) and the molten metal (6) come into contact, and the short side solidified shell (6-1) is pushed by this pushing. The slab is narrowed in the width direction by being pushed (6th
(FIG. B part). In part C of FIG. 6, the short side solidified shell (6-1) is pushed by further tilting of the dam block (14), so that the cast piece is narrowed down in the thickness direction and the upper surface side solidified shell (6-2 ) And upper belt
It is narrowed down in the thickness direction by a gap d 1 from (1).

【実施例】【Example】

ベルトキャスターの厚み絞り込みにおいて、第2図に示
す寸法D=50mm,D=50mm,R=160mm,R=2
00mm,C=1mm,C=3mmのダムブロックを用い、薄
鋳片を製造した際の鋳片上面温度と鋳造速度の関係を、
第7図に示す従来のダムブロックを用いた場合と比較し
て第4図に示す。 すなわち、従来法では鋳造速度が6m/min以上の高速鋳造
になるとキャスター出側鋳片温度上昇によりブレークア
ウトすることがあったが、第4図より明らかなごとく、
この発明法の適用によりキャスター内での冷却能がアッ
プし鋳片上面温度を低下できる結果、ブレークアウトが
大幅に減少した。 また、本実施例における鋳片短辺割れ指数を従来法と比
較して第5図に示す。第5図より、この発明法の適用に
より鋳片短辺面の割れも大幅に減少した。
When the thickness of the belt caster is narrowed down, the dimensions D 1 = 50 mm, D 2 = 50 mm, R 1 = 160 mm, R 2 = 2 shown in FIG.
Using a dam block of 00 mm, C 1 = 1 mm, C 2 = 3 mm, the relationship between the casting surface temperature and the casting speed when a thin casting was manufactured
FIG. 4 shows a comparison with the case of using the conventional dam block shown in FIG. That is, in the conventional method, when the casting speed was high speed casting of 6 m / min or more, the caster exit side slab temperature sometimes increased, causing a breakout, but as is clear from FIG.
By applying the method of the present invention, the cooling ability in the caster is increased and the temperature of the upper surface of the slab can be lowered, and as a result, the breakout is greatly reduced. In addition, the slab short side crack index in this example is shown in FIG. 5 in comparison with the conventional method. As shown in FIG. 5, by applying the method of the present invention, cracks on the short side surface of the cast slab were significantly reduced.

【発明の効果】【The invention's effect】

以上説明したごとく、この発明方法によれば、以下に示
す効果を奏する。 ベルトキャスター内で鋳片厚み方向の絞りを行なう
ことができるので、鋳片上面と上ベルトとの間に隙間を
つくることができ、鋳片上面の冷却能アップと鋳片上下
面の不均一冷却を緩和し得る。 鋳片上面側の冷却能アップにより、高速鋳造時のキ
ャスター出側でのブレークアウト防止と鋳片短辺面凝固
殻を均一化でき、欠陥のない品質良好な薄鋳片を安定し
て製造することができる。 鋳片厚み方向の絞り込みをダムブロックの形状を変
えるだけで行なうことができるので、既存の設備に容易
に適用できる。
As described above, the method of the present invention has the following effects. Since it is possible to perform drawing in the thickness direction of the slab in the belt caster, a gap can be created between the top surface of the slab and the upper belt, increasing the cooling capacity of the top surface of the slab and uneven cooling of the top and bottom surfaces of the slab. Can be relaxed. By increasing the cooling capacity of the upper surface of the slab, it is possible to prevent breakout on the caster exit side during high-speed casting and to homogenize the solidified shell on the short side of the slab, and to stably produce thin slabs of good quality without defects. be able to. Since it is possible to narrow down the thickness direction of the slab simply by changing the shape of the dam block, it can be easily applied to existing equipment.

【図面の簡単な説明】[Brief description of drawings]

第1図はこの発明方法を実施するためのダムブロックの
形状を示す縦断面図である。 第2図は同上ダムブロックを傾動させた状態を示す縦断
面図である。 第3図はこの発明の絞り込み方法を示す説明図であり、
図(A)は第6図A部の位置、図(B)は第6図B部の
位置、図(C)は第6図C部の位置をそれぞれ示す。 第4図はこの発明の実施例における鋳片上面温度と鋳造
速度の関係を示す図である。 第5図は同じく実施例における短辺割れ指数を示す図で
ある。 第6図は一般的なツインベルトキャスター方式の鋳造設
備を示す概略図である。 第7図は従来の一般的なダムブロックを示す縦断面図で
ある。 第8図は従来の鋳片幅絞り込み方法を示す概略平面図で
ある。 第9図はバックアップロール撓みによる厚み絞り込み方
法を示す説明図である。 1……上ベルト、11……下ベルト 14……ダムブロック 14-1……ダムブロック上面の円弧面 14-2……ダムブロック下面の円弧面
FIG. 1 is a longitudinal sectional view showing the shape of a dam block for carrying out the method of the present invention. FIG. 2 is a vertical sectional view showing a state in which the same dam block is tilted. FIG. 3 is an explanatory view showing a narrowing method of the present invention,
6A shows the position of part A in FIG. 6, FIG. 6B shows the position of part B in FIG. 6, and FIG. 6C shows the position of part C in FIG. FIG. 4 is a diagram showing the relationship between the temperature of the upper surface of the slab and the casting speed in the embodiment of the present invention. FIG. 5 is a diagram showing a short side crack index in the same example. FIG. 6 is a schematic diagram showing a general twin belt caster type casting facility. FIG. 7 is a vertical cross-sectional view showing a conventional general dam block. FIG. 8 is a schematic plan view showing a conventional method of narrowing a width of a cast slab. FIG. 9 is an explanatory view showing a method of narrowing the thickness by bending the backup roll. 1 …… Upper belt, 11 …… Lower belt 14 …… Dam block 14-1 …… Dam block upper surface arc surface 14-2 …… Dam block lower surface arc surface

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】ベルトキャスターのダムブロックを絞り込
んで鋳造する方法において、ダムブロック上面を円弧状
に形成し、かつ鋳片に接する側の下面と下ベルトとの間
にギャップを設け、幅方向の絞り込みと同時に該ダムブ
ロックを鋳片側に傾動させることにより上ベルトとダム
ブロック間に生じる隙間分だけ厚み方向の絞り込みを行
なうことを特徴とするベルトキャスターの絞り込み方
法。
1. A method of casting by narrowing down a dam block of a belt caster, wherein the upper surface of the dam block is formed in an arc shape, and a gap is provided between the lower surface on the side in contact with the slab and the lower belt, and A method for narrowing down a belt caster, characterized in that the dam block is tilted toward the slab simultaneously with the narrowing down, thereby narrowing down in the thickness direction by a gap created between the upper belt and the dam block.
JP13220388A 1988-05-30 1988-05-30 How to narrow down belt casters Expired - Lifetime JPH0626757B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13220388A JPH0626757B2 (en) 1988-05-30 1988-05-30 How to narrow down belt casters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13220388A JPH0626757B2 (en) 1988-05-30 1988-05-30 How to narrow down belt casters

Publications (2)

Publication Number Publication Date
JPH01306051A JPH01306051A (en) 1989-12-11
JPH0626757B2 true JPH0626757B2 (en) 1994-04-13

Family

ID=15075804

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13220388A Expired - Lifetime JPH0626757B2 (en) 1988-05-30 1988-05-30 How to narrow down belt casters

Country Status (1)

Country Link
JP (1) JPH0626757B2 (en)

Also Published As

Publication number Publication date
JPH01306051A (en) 1989-12-11

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