JP3228212B2 - Method and apparatus for producing round billet slabs by continuous casting - Google Patents

Method and apparatus for producing round billet slabs by continuous casting

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Publication number
JP3228212B2
JP3228212B2 JP01588598A JP1588598A JP3228212B2 JP 3228212 B2 JP3228212 B2 JP 3228212B2 JP 01588598 A JP01588598 A JP 01588598A JP 1588598 A JP1588598 A JP 1588598A JP 3228212 B2 JP3228212 B2 JP 3228212B2
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JP
Japan
Prior art keywords
roll
slab
forming
continuous casting
round billet
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 - Fee Related
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JP01588598A
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Japanese (ja)
Other versions
JPH11216547A (en
Inventor
敦嗣 平田
克美 木本
憲一 信田
誠一郎 林田
勝吉 岩田
Original Assignee
住友金属工業株式会社
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Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【発明の属する技術分野】本発明は、連続鋳造による丸
ビレット鋳片の製造方法と装置、特に連続鋳造に続いて
未凝固圧下法および凝固後成形法を用いる、製管用の丸
ビレット鋳片の製造方法と装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing round billet slabs by continuous casting, and more particularly to a method for producing round billet slabs for pipe making using continuous casting followed by unsolidification rolling and post-solidification molding methods. It relates to a manufacturing method and an apparatus.
【0002】[0002]
【従来の技術】連続鋳造により丸ビレット鋳片を製造す
る場合、材質が低炭素鋼、軸受け鋼等の低合金鋼、高Cr
鋼のときには、最後に凝固する中心部に偏析 (中心偏
析) 、軸芯割れ、ポロシティが生成する。そのような鋳
片をシームレスパイプ製造にそのまま用いると内面疵を
多発し、製品とならない。
2. Description of the Related Art When producing round billet slabs by continuous casting, the materials are low carbon steel, low alloy steel such as bearing steel, and high Cr.
In the case of steel, segregation (center segregation), axial cracks, and porosity are generated in the center that finally solidifies. If such a slab is used as it is in the production of a seamless pipe, internal flaws occur frequently and do not become a product.
【0003】そこで、丸ビレット鋳片の内面品質向上の
ために、凝固完了後、鋳片に圧下を施す方法が多く提案
されている。例えば、特開平9−201601号公報、同9−
201602号公報はいずれも凝固完了後に圧下を加えた後、
再度、丸鋳片にする方法を開示している。
[0003] In order to improve the inner surface quality of round billet slabs, there have been proposed many methods of reducing the slab after solidification is completed. For example, JP-A-9-201601 and JP-A-9-201601
After applying the reduction after solidification is completed,
Again, a method of making a round slab is disclosed.
【0004】[0004]
【発明が解決しようとする課題】このような従来技術に
対して、本出願人は、未凝固時に鋳片に圧下を施す方法
も、例えば、特願平9−56478 号、同9−56477 号、同
9−144200号において提案した。これらはいづれも中心
部が未凝固部の位置にて大圧下を施し、その後真円に成
形する方法を開示している。
In contrast to such prior art, the present applicant has also proposed a method of reducing the slab during unsolidification, for example, in Japanese Patent Application Nos. 9-56478 and 9-56477. No. 9-144200. These methods disclose a method in which a central portion is subjected to a large pressure reduction at a position of an unsolidified portion and then formed into a perfect circle.
【0005】しかしながら、上記のような未凝固圧下法
に続いて凝固完了圧下を行う方法を、実際の生産に用い
ようとすると、真円に成形する際のロール圧下の鋳込上
流側において、鋳片の天地方向がねじれてしまう現象が
発生することが判明した。このような現象が発生する
と、成形ロールに所定の狙いどうりの方向では鋳片が挿
入されないことになり、真円形状に成形することが不可
能となる。
However, if the method of performing the solidification completion reduction following the above-described unsolidification reduction method is to be used for actual production, the casting upstream of the roll reduction under the roll reduction when forming into a perfect circle is performed. It has been found that a phenomenon in which the vertical direction of the piece is twisted occurs. When such a phenomenon occurs, the cast slab is not inserted into the forming roll in a predetermined desired direction, and it becomes impossible to form a perfect circular shape.
【0006】ここに、本発明の目的は、未凝固圧下法あ
るいは凝固完了圧下法のいずれにおいても、最終的な真
円成形に際しての鋳片の真円成形ロールへの正しい挿入
が行われる技術を開発することである。
Here, an object of the present invention is to provide a technique for correctly inserting a slab into a perfect circular forming roll at the time of final perfect circular forming in either the unsolidified rolling method or the solidification completed rolling method. It is to develop.
【0007】[0007]
【課題を解決するための手段】本発明者らは、上述の課
題解決について検討を重ね、次のような知見を得た。 例えば垂直ロールから成る真円成形ロールに入る前の
鋳片は天地方向につぶれた楕円形状をしており、その楕
円度が大きいほど、容易にねじれが発生する。
Means for Solving the Problems The present inventors have repeatedly studied the above-mentioned problems and obtained the following knowledge. For example, the slab before entering the perfect circular forming roll composed of a vertical roll has an elliptical shape that is crushed in the vertical direction, and the greater the ellipticity, the more easily twisting occurs.
【0008】ねじれは、楕円鋳片の成形中に、鋳片が
より力のかかりにくい方へと逃げることにより発生する
ため、垂直ロールから成る真円成形ロールへと挿入する
際に、常に水平に保持しながら挿入することが必要であ
る。
[0008] Since the twist is generated by the escape of the slab to the direction where less force is applied during the formation of the elliptical cast slab, when the slab is inserted into a perfect circular forming roll composed of a vertical roll, the twist always occurs. It is necessary to insert while holding.
【0009】したがって、楕円度が大きい鋳片でも、ね
じれ発生の防止が可能であることを知り、そのための手
段として、例えば垂直ロールから成る真円成形ロールへ
挿入する際には、常に水平に保持して置くことが、ある
いはその逆が重要であることに着目して、本発明を完成
した。
Therefore, it has been found that twisting can be prevented even with a cast piece having a large ellipticity, and as a means for that purpose, for example, when the cast piece is inserted into a perfect circular forming roll composed of a vertical roll, it is always held horizontally. The present invention has been completed by noting that it is important to place them in the opposite direction or vice versa.
【0010】ここに、本発明は次の通りである。 (1) 丸ビレットの連続鋳造に続いて、未凝固圧下、そし
て凝固完了後に真円成形を行う丸ビレット鋳片の製造方
法において、上流側に設けたロールによって鋳片押さえ
を行いながら前記真円成形を真円成形用ロールによって
行うことを特徴とする、連続鋳造による丸ビレット鋳片
の製造方法。
Here, the present invention is as follows. (1) Following the continuous casting of a round billet, in a method for producing a round billet slab in which unsolidification is performed under a unsolidified pressure, and after solidification is completed, the round shape is performed while holding the slab by a roll provided on the upstream side. A method for producing a round billet slab by continuous casting, wherein the forming is performed by a perfect circular forming roll.
【0011】(2) 丸ビレットの連続鋳造装置における凝
固完了後の成形領域において、真円成形用ロールと、該
真円成形用ロールの上流側に鋳片押さえ用ロールを設置
したことを特徴とする、連続鋳造による丸ビレット鋳片
の製造装置。
(2) In a forming area after solidification is completed in a round billet continuous casting apparatus, a perfect round forming roll and a slab holding roll are provided upstream of the perfect round forming roll. To manufacture round billet slabs by continuous casting.
【0012】(3) 丸ビレットの連続鋳造に際して、水平
ロール1段による未凝固圧下を加えた後、垂直ロール1
段による真円成形を加え、その後最終ピンチロールによ
り引き抜く過程において、真円成形用の垂直ロールの上
流側に鋳片押さえ用水平ロールを設置することを特徴と
する、連続鋳造による丸ビレット鋳片の製造方法。
(3) In continuous casting of a round billet, a non-solidifying pressure is applied by one horizontal roll, and then the vertical roll 1
A round billet slab by continuous casting, in which a horizontal roll for holding a slab is provided upstream of a vertical roll for forming a perfect circle in a process of adding a perfect circle by a step and then pulling out by a final pinch roll. Manufacturing method.
【0013】(4) 丸ビレットの連続鋳造に際して、最終
ピンチロールによる引き抜き後水平ロール1段による未
凝固圧下を加えた後、垂直ロール1段による真円成形を
加える過程において、真円成形用の垂直ロールの上流側
に鋳片押さえ用水平ロールを設置することを特徴とす
る、連続鋳造による丸ビレット鋳片の製造方法。
(4) In the continuous casting of a round billet, after drawing by a final pinch roll, applying a non-solidification reduction by one horizontal roll, and then applying a perfect circular molding by one vertical roll, A method for producing a round billet slab by continuous casting, wherein a horizontal roll for slab holding is installed upstream of a vertical roll.
【0014】(5) 前記(3) または(4) において、垂直ロ
ールロール1段による真円成形の後、水平ロール1段、
垂直ロール1段、というように複数段の真円成形用ロー
ルを設ける、連続鋳造による丸ビレット鋳片の製造方
法。
(5) In the above (3) or (4), after forming a perfect circle by one vertical roll roll, one horizontal roll,
A method for producing round billet slabs by continuous casting, in which a plurality of round forming rolls, such as a vertical roll, are provided.
【0015】(6) 前記鋳片押さえ用水平ロールを前記の
真円成形用の垂直ロールの上流側3m以内に設ける上記
(3) ないし(5) のいずれかに記載の連続鋳造による丸ビ
レット鋳片の製造方法。
(6) The horizontal roll for holding a slab is provided within 3 m upstream of the vertical roll for forming a perfect circle.
(3) The method for producing a round billet slab by continuous casting according to any one of (5) to (5).
【0016】[0016]
【発明の実施の形態】次に、添付図面を参照して本発明
の実施の形態についてさらに具体的に説明する。
Next, embodiments of the present invention will be described more specifically with reference to the accompanying drawings.
【0017】図1(a) 、(b) は、本発明にかかる連続鋳
造による丸ビレット鋳片の製造工程の一例を示す模式的
説明図である。図1(a) に示すように、タンディッシュ
1から平面断面が円形の連続鋳造用鋳型2に注入された
溶鋼3は鋳型2内において冷却され、凝固シェルが外側
に形成される。この鋳型2から引き抜かれた鋳片4は、
スプレー冷却帯5を経てピンチロール帯6に入り、次い
で未凝固圧下用の水平ロール対7にて中心部が未凝固の
状態にて大圧下される。未凝固圧下は必要により垂直ロ
ール対によって行ってもよい。
FIGS. 1 (a) and 1 (b) are schematic explanatory views showing an example of a production process of a round billet slab by continuous casting according to the present invention. As shown in FIG. 1 (a), molten steel 3 poured from a tundish 1 into a continuous casting mold 2 having a circular plane cross section is cooled in the mold 2 and a solidified shell is formed outside. The slab 4 drawn from the mold 2 is
After entering the pinch roll zone 6 through the spray cooling zone 5, the central roll is greatly reduced in a non-solidified state by a pair of horizontal rolls 7 for non-solidification reduction. Unsolidification reduction may be performed by a vertical roll pair if necessary.
【0018】このとき断面が楕円形となった鋳片は、図
示例では完全凝固後の領域に設けられた鋳片押さえ用水
平ロール対8を経て、真円成形用の垂直ロール対9にて
真円成形され、シームレスパイプ製造用の丸ビレット鋳
片とされる。その後、最終のピンチロール10によって引
き抜かれる。真円成形ロール対が水平ロール対の場合に
は鋳片押さえ用ロールは垂直ロール対となる。
At this time, the slab having an elliptical cross section passes through a pair of horizontal rolls 8 for holding slabs provided in a region after complete solidification in the illustrated example, and then to a pair of vertical rolls 9 for forming a perfect circle. It is formed into a perfect circle and becomes a round billet slab for manufacturing a seamless pipe. Then, it is pulled out by the final pinch roll 10. When the pair of round forming rolls is a horizontal roll pair, the slab holding roll is a vertical roll pair.
【0019】図示例では、真円成形用のロール対は一対
しか設けていないが、必要に応じて、垂直ロール、水平
ロール、垂直ロールというように、垂直ロールと水平ロ
ールを交互に複数段設けてもよい。このように真円成形
ロールを多段に設けた場合、一部を孔型ロールとしても
よい。
In the illustrated example, only one pair of rolls for forming a perfect circle is provided, but if necessary, a plurality of vertical rolls and horizontal rolls are alternately provided, such as a vertical roll, a horizontal roll, and a vertical roll. You may. When the round forming rolls are provided in multiple stages as described above, a part of the rolls may be a hole type roll.
【0020】また、鋳片押さえ用水平ロールはフラット
ロールでも、カリバーロールでもよい。図1(b) は、図
1(a) の変更例であって、真円成形ロール9の下流側に
ピンチロールを設けない場合を示すが、特に図示例では
真円成形用の垂直ロールを2段に設けている。
The horizontal roll for holding the slab may be a flat roll or a caliber roll. FIG. 1 (b) is a modification of FIG. 1 (a) and shows a case where no pinch roll is provided on the downstream side of the perfect circular forming roll 9, but in the illustrated example, a vertical roll for perfect circular forming is used. It is provided in two stages.
【0021】ここに、本発明者らの知見によれば、図示
例の場合、真円成形ロールによる鋳片ねじれの現象は、
垂直方向における未凝固圧下によって、断面楕円形に変
形した鋳片を、垂直ロールにて真円成形を行おうとする
ため、鋳片水平方向のロールへの接触が点接触に近く、
安定性に欠けるため、図2(b) に示すように鋳片に力の
かかりにくい方向に鋳片が逃げてしまうことにより発生
する。
Here, according to the findings of the present inventors, in the case of the illustrated example, the phenomenon of slab twisting due to the perfect circular forming roll is as follows.
Due to the unsolidification reduction in the vertical direction, the slab deformed into an elliptical cross section is going to be formed into a perfect circle with a vertical roll, so the contact to the roll in the horizontal direction of the slab is close to point contact,
Due to lack of stability, as shown in FIG. 2 (b), this occurs when the slab escapes in a direction in which a force is less likely to be applied to the slab.
【0022】すなわち、図2(a) に示すように真円成形
用ロールに挿入された断面が楕円形の鋳片は、真円成形
用ロールに対して楕円先端の点接触となるため安定せ
ず、図2(b) のように矢印方向に回転しながら真円成形
ロール内に挿入されることになる。したがって、天地方
向のねじれは避けられない。図示例では真円成形用ロー
ルが垂直ロール対の場合を示すが、水平ロール対の場合
も事情は同じである。図3に示すように、このときのね
じれの程度、つまりねじれ度は、鋳込長さ1m 当たりの
ねじれ角度 (θ)をもって記述する。
That is, as shown in FIG. 2 (a), the cast slab having an elliptical cross section inserted into the roll for forming a perfect circle has a point contact at the tip of the ellipse with the roll for forming a perfect circle, so that it is stable. Instead, as shown in FIG. 2 (b), it is inserted into the round forming roll while rotating in the direction of the arrow. Therefore, a twist in the vertical direction is inevitable. In the illustrated example, the case where the perfect circular forming roll is a vertical roll pair is shown, but the situation is the same for a horizontal roll pair. As shown in FIG. 3, the degree of twist at this time, that is, the degree of twist, is described as a twist angle (θ) per m of the casting length.
【0023】ここに、本発明によればかみ込み時および
真円成形時に図2(a) の状態を維持させるために、真円
成形用ロールの上流側に鋳片押さえ用ロール (単に押さ
え用ロールとも云う) 、図示例では水平ロールを配置す
るのである。したがって、その限りにおいて水平ロール
の配置は制限されないが、一般にはパスラインを一致さ
せて可及的に近接して設置する。
According to the present invention, in order to maintain the state shown in FIG. 2A at the time of biting and at the time of forming a perfect circle, a slab holding roll (merely a holding In the illustrated example, horizontal rolls are arranged. Therefore, the arrangement of the horizontal rolls is not limited as long as it is in general, but the rolls are generally installed as close as possible with matching pass lines.
【0024】ところで、鋳片のねじれ度 (鋳込長1mあ
たりのねじれ角度) は未凝固圧下率(圧下率、つまり圧
下による厚み変化率) に依存する。この関係を実験的に
求め、グラフに示したものを図4に示す。
By the way, the degree of twist of the slab (the twist angle per 1 m of the casting length) depends on the unsolidified draft rate (the draft rate, ie, the rate of thickness change due to the draft). This relationship was experimentally determined, and what is shown in the graph is shown in FIG.
【0025】図4において、ねじれ度が1°/mをこえ
ると成形時の真円度が1.5 %を越えてしまいシームレス
パイプ用素材として使用できなくなる。また、内部品質
改善効果があるのは、従来の技術から圧下率15%以上の
場合である。したがって、内部品質改善効果を得る場合
は必ず鋳片ねじれが問題となる。
In FIG. 4, if the degree of twist exceeds 1 ° / m, the roundness at the time of molding exceeds 1.5%, and the material cannot be used as a material for a seamless pipe. In addition, the effect of improving the internal quality is obtained when the rolling reduction is 15% or more from the conventional technology. Therefore, in order to obtain the effect of improving the internal quality, the twist of the slab always becomes a problem.
【0026】ここに、本発明によれば、真円成形ロール
の鋳込上流側に押さえ用ロールを設けることにより、常
に楕円の長径を水平にした真円成形用ロールへの挿入が
可能となり、ねじれが防止できる。
According to the present invention, by providing the holding roll on the upstream side of the casting of the perfect circular forming roll, it is possible to always insert the perfect circular forming roll with the major axis of the ellipse horizontal. Twist can be prevented.
【0027】なお、鋳込下流側に設けることは、真円成
形後の鋳片を再度圧下することになるため意味がない。
鋳片押さえ用ロールは駆動式であることが望ましいが、
非駆動でもよい。また、荷重は未凝固圧下した鋳片厚み
をさらに圧下することがなく、かつ、充分に鋳片の保持
が可能なように、押し付け力は5〜50トンとすることが
望ましい。
It is meaningless to provide the cast slab after casting into a round shape again by providing it on the downstream side of the casting.
The slab holding roll is preferably driven,
It may not be driven. Further, it is desirable that the pressing force be 5 to 50 tons so that the load does not further reduce the thickness of the unsolidified and reduced slab and that the slab can be sufficiently held.
【0028】すでに述べたように、鋳片押さえ用ロール
は、ねじれが防止できれば、その設置位置に関しても、
特定の形態に制限されないが、一般には、成形ロールの
鋳込上流側3m以内に設置することが望ましい。これ
は、これ以上の距離をあけると、例えば、常に楕円の長
径を水平にして垂直成形ロールへの挿入が実際上困難と
なるからである。
As already described, if the slab holding roll can be prevented from being twisted, it can be installed at any position.
Although not limited to a particular form, it is generally desirable to install it within 3 m upstream of the forming roll on the casting side. This is because if the distance is longer than this, it is practically difficult to insert the ellipse into the vertical forming roll, for example, by always keeping the major axis of the ellipse horizontal.
【0029】このような関係を実験的に求めた結果を図
5にグラフでもって示す。押さえ用水平ロール〜真円成
形ロール間距離が3mを越えるとねじれ度が1°/mを
越えるため、成形時の真円度が1.5 %を越えてしまいシ
ームレスパイプ用素材として使用できなくなる。次に、
本発明の作用効果について実施例によってさらに具体的
に説明する。
FIG. 5 is a graph showing the result of experimentally determining such a relationship. If the distance between the holding horizontal roll and the round forming roll exceeds 3 m, the degree of twist exceeds 1 ° / m, so that the roundness during forming exceeds 1.5% and cannot be used as a material for a seamless pipe. next,
The operation and effect of the present invention will be described more specifically with reference to examples.
【0030】[0030]
【実施例】直径225 mmの断面円形の連続鋳造用鋳型に
て、図1(a) に示す構造に実質上等しい設備により丸ビ
レット鋳片を鋳造した。未凝固圧下用の水平ロール対7
による未凝固圧下位置は、溶湯メニスカスより23mと
し、鋳片押さえ用水平ロール8、真円成形ロール9はそ
れぞれ溶湯メニスカスよ31m、32mの位置に配置した。
EXAMPLE A round billet slab was cast in a continuous casting mold having a circular section of 225 mm in diameter with equipment substantially equivalent to the structure shown in FIG. Horizontal roll pair 7 for unsolidification reduction
The unsolidification rolling position was 23 m from the molten metal meniscus, and the horizontal roll 8 for slab holding and the perfect circular forming roll 9 were arranged at positions 31 m and 32 m from the molten meniscus, respectively.
【0031】鋳造速度は1.2 〜2.2 m/min 、スプレー冷
却比水量は0.05〜0.8 l/kg・steelとした。表1に、本
発明にかかる鋳片押さえ用ロール適用の効果を示す。
The casting speed was 1.2 to 2.2 m / min, and the spray cooling specific water amount was 0.05 to 0.8 l / kg · steel. Table 1 shows the effects of applying the slab holding roll according to the present invention.
【0032】ねじれ度とは、鋳込長1mあたりの図3に
示すねじれ角度 (θ) である。また、真円度とは直径か
ら短径を引いたものを真円径で除して、100 をかけたも
のである。この真円度は1.5 %以下が良好なレベルであ
る。
The degree of twist is the twist angle (θ) shown in FIG. 3 per casting length of 1 m. The roundness is a value obtained by dividing a value obtained by subtracting a minor diameter from a diameter by a true circular diameter and multiplying by 100. A good level of this roundness is 1.5% or less.
【0033】実施例1は、鋳造速度を1.2 m/min とし
て、本発明にかかる押さえロールを適用した例であり、
ねじれ度は0°/m、真円度は1.0 %であるため、安定
した連続圧下操業ができている。
Example 1 is an example in which the holding speed according to the present invention is applied at a casting speed of 1.2 m / min.
Since the degree of twist is 0 ° / m and the roundness is 1.0%, stable continuous rolling operation is possible.
【0034】実施例2は、鋳造速度を1.8 m/min とし
て、本発明にかかる押さえロールを適用した例であり、
ねじれ度は0°/m、真円度は0.8 %であるため、安定
した連続圧下操業ができている。
Example 2 is an example in which the presser roll according to the present invention is applied at a casting speed of 1.8 m / min.
Since the degree of twist is 0 ° / m and the roundness is 0.8%, stable continuous rolling operation is possible.
【0035】実施例3は、鋳造速度を2.2 m/min とし
て、本発明にかかる押さえロールを適用した例であり、
ねじれ度は0°/m、真円度は1.2 %であるため、安定
した連続圧下操業ができている。
Example 3 is an example in which the holding speed according to the present invention is applied at a casting speed of 2.2 m / min.
Since the degree of twist is 0 ° / m and the roundness is 1.2%, stable continuous rolling operation is possible.
【0036】しかしながら、本発明のように押さえロー
ルを適用しない比較例ではいずれも満足する結果は得ら
れなかった。比較例1は、鋳造速度を1.2 m/min とする
が、押さえロールを適用しない例であり、ねじれ度が2
°/mで連続圧下操業が不可能なうえに、真円度が5.0
%と1.5 %を超えているため品質上問題がある。
However, no satisfactory results were obtained in any of the comparative examples in which the pressing roll was not applied as in the present invention. Comparative Example 1 is an example in which the casting speed was set to 1.2 m / min, but the holding roll was not applied, and the twist degree was 2 m / min.
Continuous rolling operation is impossible at ° / m, and roundness is 5.0
% And 1.5%, there is a quality problem.
【0037】比較例2は、鋳造速度を1.8 m/min とする
が、押さえロールを適用しない例であり、ねじれ度が4
°/mで連続圧下操業が不可能なうえに、真円度が7.0
%と1.5 %を超えているため品質上問題がある。
Comparative Example 2 is an example in which the casting speed was 1.8 m / min, but the press roll was not used, and the twist degree was 4
Continuous rolling operation is impossible at ° / m, and roundness is 7.0
% And 1.5%, there is a quality problem.
【0038】比較例3は、鋳造速度を2.2 m/min とする
が、押さえロールを適用しない例であり、ねじれ度が6
°/mで連続圧下操業が不可能なうえに、真円度が10.0
%と1.5 %を超えているため品質上問題がある。
Comparative Example 3 is an example in which the casting speed was 2.2 m / min, but the pressing roll was not applied, and the twist degree was 6 m / min.
Continuous rolling operation is not possible at ° / m, and roundness is 10.0
% And 1.5%, there is a quality problem.
【0039】次いで図1(b) に示す構成と同様の連続鋳
造装置を用いても本発明を実施した。ただし、真円成形
は1段で行った。その結果、上述の例と同様の結果が得
られた。
Next, the present invention was carried out using a continuous casting apparatus having the same structure as that shown in FIG. However, the perfect circular molding was performed in one stage. As a result, the same result as in the above example was obtained.
【0040】[0040]
【表1】 [Table 1]
【0041】[0041]
【発明の効果】以上説明したように、本発明によれば、
連続鋳造によって未凝固圧下法、凝固後成形法を用いて
丸ビレット鋳片を製造する際に、操業上安定して連続成
形が可能であり、かつ品質上重要である真円度も良好な
ものが得られるため、その実用上の意義は大きい。
As described above, according to the present invention,
When manufacturing round billet slabs using the unsolidification rolling method and the post-solidification molding method by continuous casting, continuous molding is possible with stable operation and good roundness, which is important for quality. Therefore, its practical significance is great.
【図面の簡単な説明】[Brief description of the drawings]
【図1】図1(a) は、本発明にかかる圧下法を実施する
ための設備概要を示す模式的説明図、図1(b) はその変
更例の部分的説明図である。
FIG. 1 (a) is a schematic explanatory view showing an outline of equipment for implementing a drafting method according to the present invention, and FIG. 1 (b) is a partial explanatory view of a modified example thereof.
【図2】図2(a) 、(b) は真円成形時に鋳片がねじれて
いる状態を示す模式的説明図である。
FIGS. 2 (a) and 2 (b) are schematic explanatory views showing a state in which a slab is twisted at the time of forming a perfect circle.
【図3】真円成形時の鋳片ねじれ度を示す模式的説明図
である。
FIG. 3 is a schematic explanatory view showing the degree of twist of a slab at the time of forming a perfect circle.
【図4】未凝固圧下率と鋳片ねじれ度の関係を示すグラ
フである。
FIG. 4 is a graph showing the relationship between unsolidified draft and slab twist.
【図5】押さえロール〜真円成形ロール間距離とねじれ
度の関係を示すグラフである。
FIG. 5 is a graph showing a relationship between a distance between a holding roll and a perfect circular forming roll and a degree of twist.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 林田 誠一郎 和歌山市湊1850番地 住友金属工業株式 会社和歌山製鉄所内 (72)発明者 岩田 勝吉 和歌山市湊1850番地 住友金属工業株式 会社和歌山製鉄所内 (56)参考文献 特開 平8−117941(JP,A) 特開 平9−201602(JP,A) 特開 平9−201601(JP,A) 特開 平7−204812(JP,A) 特開 平1−289552(JP,A) 特開 昭51−37031(JP,A) 特開 平10−249490(JP,A) 特開 平10−146651(JP,A) 特開 平10−328800(JP,A) 特開 平9−295113(JP,A) 特開 平3−275259(JP,A) 特開 平10−175049(JP,A) 特開 平10−166124(JP,A) 実開 昭50−34410(JP,U) 特公 昭44−17366(JP,B1) (58)調査した分野(Int.Cl.7,DB名) B22D 11/128 350 B21B 1/46 B22D 11/00 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Seiichiro Hayashida 1850 Minato, Wakayama Sumitomo Metal Industries Co., Ltd.Sumitomo Metal Works Ltd. (72) Inventor Katsuyoshi Iwata 1850 Minato, Wakayama City Sumitomo Metal Industries Co., Ltd. References JP-A-8-117941 (JP, A) JP-A-9-201602 (JP, A) JP-A-9-201601 (JP, A) JP-A-7-204812 (JP, A) JP-A-1 JP-A-289552 (JP, A) JP-A-51-37031 (JP, A) JP-A-10-249490 (JP, A) JP-A-10-144661 (JP, A) JP-A-10-328800 (JP, A) JP-A-9-295113 (JP, A) JP-A-3-275259 (JP, A) JP-A-10-175049 (JP, A) JP-A-10-166124 (JP, A) 34410 (JP, U) JP44-17366 (JP, B1 (58) Fields surveyed (Int. Cl. 7 , DB name) B22D 11/128 350 B21B 1/46 B22D 11/00

Claims (6)

    (57)【特許請求の範囲】(57) [Claims]
  1. 【請求項1】 丸ビレットの連続鋳造に続いて、未凝固
    圧下、そして凝固完了後に真円成形を行う丸ビレット鋳
    片の製造方法において、上流側に設けたロールによって
    鋳片押さえを行いながら前記真円成形を真円成形用ロー
    ルによって行うことを特徴とする、連続鋳造による丸ビ
    レット鋳片の製造方法。
    1. A method for producing a round billet slab in which continuous casting of a round billet is performed, followed by unsolidification under pressure, and after the solidification is completed, wherein the slab is held down by a roll provided on an upstream side. A method for producing round billet slabs by continuous casting, characterized in that perfect circular forming is performed by a perfect circular forming roll.
  2. 【請求項2】 丸ビレットの連続鋳造装置における凝固
    完了後の成形領域において、真円成形用ロールと、該真
    円成形用ロールの上流側に鋳片押さえ用ロールを設置し
    たことを特徴とする、連続鋳造による丸ビレット鋳片の
    製造装置。
    2. In a molding area after solidification in a continuous casting device for a round billet, a roll for forming a perfect circle and a roll for holding a slab are provided upstream of the roll for forming a perfect circle. , Continuous billet production equipment for round billet.
  3. 【請求項3】 丸ビレットの連続鋳造に際して、水平ロ
    ール1段による未凝固圧下を加えた後、垂直ロール1段
    による真円成形を加え、その後ピンチロールにより引き
    抜く過程において、真円成形用の垂直ロールの上流側に
    鋳片押さえ用水平ロールを設置することを特徴とする、
    連続鋳造による丸ビレット鋳片の製造方法。
    3. In the continuous casting of a round billet, a non-solidifying pressure is applied by one horizontal roll, a true circular forming is applied by one vertical roll, and then a drawing is performed by a pinch roll. Characterized by installing a horizontal roll for slab holding on the upstream side of the roll,
    A method for producing round billet slabs by continuous casting.
  4. 【請求項4】 丸ビレットの連続鋳造に際して、ピンチ
    ロールによる引き抜き後水平ロール1段による未凝固圧
    下を加えた後、垂直ロール1段による真円成形を加える
    過程において、真円成形用の垂直ロールの上流側に鋳片
    押さえ用水平ロールを設置することを特徴とする、連続
    鋳造による丸ビレット鋳片の製造方法。
    4. A continuous roll for forming a perfect circle in a process of applying a non-solidification pressure by a single horizontal roll after drawing by a pinch roll and then applying a perfect circular forming by a vertical roll during continuous casting of a round billet. A method for producing a round billet slab by continuous casting, wherein a horizontal roll for slab holding is installed upstream of the slab.
  5. 【請求項5】 請求項3または4において、垂直ロール
    1段による真円成形の後、水平ロール1段、垂直ロール
    1段、というように複数段の真円成形用ロールを設け
    る、連続鋳造による丸ビレット鋳片の製造方法。
    5. The continuous casting according to claim 3, wherein after a round forming by one vertical roll, a plurality of round forming rolls such as a horizontal roll and a vertical roll are provided. Manufacturing method of round billet slab.
  6. 【請求項6】 前記鋳片押さえ用水平ロールを前記の真
    円成形用の垂直ロールの上流側3m 以内に設ける請求項
    3ないし5のいずれかに記載の連続鋳造による丸ビレッ
    ト鋳片の製造方法。
    6. The method for producing a round billet slab by continuous casting according to claim 3, wherein the horizontal roll for holding the slab is provided within 3 m upstream of the vertical roll for forming a perfect circle. .
JP01588598A 1998-01-28 1998-01-28 Method and apparatus for producing round billet slabs by continuous casting Expired - Fee Related JP3228212B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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JP3228212B2 true JP3228212B2 (en) 2001-11-12

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Country Link
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* Cited by examiner, † Cited by third party
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DE10144234A1 (en) * 2001-09-08 2003-03-27 Sms Demag Ag Method and device for optimizing the quality of cast strands with round or approximately round cross sections
CN102189102B (en) * 2010-03-09 2013-02-06 中冶东方工程技术有限公司秦皇岛研究设计院 Method for rolling liquid core under heavy reduction rate by virtue of online thickness regulating roll by utilizing continuous casting machine

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