JPH0620609B2 - Ending method of casting operation in belt type continuous casting machine - Google Patents
Ending method of casting operation in belt type continuous casting machineInfo
- Publication number
- JPH0620609B2 JPH0620609B2 JP26177187A JP26177187A JPH0620609B2 JP H0620609 B2 JPH0620609 B2 JP H0620609B2 JP 26177187 A JP26177187 A JP 26177187A JP 26177187 A JP26177187 A JP 26177187A JP H0620609 B2 JPH0620609 B2 JP H0620609B2
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- mold
- cooling
- continuous casting
- casting machine
- 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
Links
Classifications
-
- 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
- B22D11/0685—Accessories therefor for cooling the cast product during its passage through the mould surfaces by cooling the casting belts
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、薄鋳片を連続鋳造するのに用いられるベル
ト式連続鋳造機における鋳造操業終了方法に関するもの
であり、特にタンディッシュ内溶湯の払い出しのあとし
ばしば生起し勝ちなブリード現象を適切に防止する方法
を提案しようとするものである。TECHNICAL FIELD The present invention relates to a casting operation termination method in a belt type continuous casting machine used for continuously casting thin cast pieces, and particularly to a method for finishing molten metal in a tundish. The purpose is to propose a method for appropriately preventing the bleeding phenomenon that often occurs after payout.
ブリード現象とは、タンディッシュからモールドへの注
湯が終了したとき、引続き連続鋳造機内鋳片を引抜く際
に、冷却媒体膜の液圧が溶湯静圧に打ち勝つことによっ
て押し出された未凝固溶湯が、短辺鋳型下端より流出す
る現象をいう。The bleeding phenomenon is the unsolidified molten metal extruded by the fluid pressure of the cooling medium film overcoming the static pressure of the molten metal when the cast piece in the continuous casting machine is continuously withdrawn when the pouring from the tundish into the mold is completed. However, it means that the short side mold flows out from the lower end of the mold.
ブリードした地金は、連続鋳造機の各所に集積するため
種々のトラブルが発生する。The bleeding metal is accumulated in various places of the continuous casting machine, which causes various troubles.
（従来の技術） ブリード現象を抑制する方法として、特開昭54−39321
号公報には、凝固した鋳片後端部が短辺鋳型下端を通り
抜けるときすでに鋳型内で鋳片後端湯面が凝固して、漏
れ出ない程度の速度に引抜き速度を減少させる方法が提
案されている。(Prior Art) Japanese Patent Application Laid-Open No. 54-39321 discloses a method for suppressing the bleeding phenomenon.
In the gazette, when the solidified slab rear end passes through the lower end of the short side mold, the slab rear end molten metal surface is already solidified in the mold, and a method is proposed to reduce the drawing speed to a level at which leakage does not occur. Has been done.
（発明が解決しようとする問題点） 鋳片引抜き速度を低下させると、生産性の低下を招く不
利があるばかりでなく、鋳片全体の温度が低下してダイ
レクト圧延をする場合、再加熱が必要となって省エネル
ギーの観点からも問題になった。(Problems to be solved by the invention) When the casting strip drawing speed is lowered, not only is there a disadvantage that productivity is lowered, but also when the temperature of the entire casting piece is lowered and direct rolling is performed, reheating is not performed. It became necessary and became a problem from the viewpoint of energy saving.
この発明は、鋳片引抜き速度を低下させることなしにブ
リード現象を防止することのできる、ベルト式連続鋳造
機における鋳造操業終了方法を提案することを目的とす
る。It is an object of the present invention to propose a casting operation termination method for a belt type continuous casting machine, which can prevent the bleeding phenomenon without reducing the slab drawing speed.
（問題点は解決するための手段） この発明は、ベルト鋳型に作用する溶湯静圧とつち合う
液圧の冷却媒体膜によってベルト鋳型を支持するベルト
式連続鋳造機における鋳造操業終了方法であって、タン
ディッシュからの注湯を終了して鋳型内の溶湯を払い出
すに際し、冷却媒体膜を形成させる水膜冷却装置による
冷却ゾーンを、引き抜き方向へ複数個に区分しておき、
注湯終了に伴う鋳型内の溶湯自由液面の降下量を計測す
ることにより、該溶湯自由液面と、区分された各冷却ゾ
ーンとの相当距離の変化を逐次に計算し、この計算結果
に基づいて冷却ゾーンのそれぞれに対応する溶湯静圧の
減少量を計算して、この静圧減少量につい合うだけ冷却
媒体用の液圧を逐次に低下させることを特徴とするベル
ト式連続鋳造機における鋳造操業終了方法である。(Means for Solving Problems) The present invention is a method for ending casting operation in a belt type continuous casting machine in which a belt mold is supported by a liquid cooling medium film compensating for the molten metal static pressure acting on the belt mold. Then, when pouring the molten metal in the mold after finishing pouring from the tundish, the cooling zone by the water film cooling device for forming the cooling medium film is divided into a plurality of parts in the drawing direction,
By measuring the amount of drop of the melt free liquid level in the mold at the end of pouring, the change in the equivalent distance between the melt free liquid level and each of the divided cooling zones is sequentially calculated, and this calculation result is In the belt-type continuous casting machine, which is characterized in that the amount of decrease in the molten metal static pressure corresponding to each of the cooling zones is calculated based on the calculated amount, and the liquid pressure for the cooling medium is sequentially decreased as much as this static pressure decrease amount. This is the method of ending the casting operation.
さて一般に、ベルト式連続鋳造機の冷却媒体としては、
多くの場合に水が用いられるので以下、冷却水による事
例について説明する。Generally, as a cooling medium for a belt type continuous casting machine,
Since water is used in many cases, a case using cooling water will be described below.
第１図には、この発明の方法を適用するベルト式連続鋳
造機について示す。図中１はベルト，２はガイドロー
ラ，９は流量制御弁，10は流量計を示す。この連続鋳造
機では、第２図に示すようにベルトの背面から水膜冷却
装置３にて水膜冷却が行われる。この水膜冷却装置に
は、第３図に示すように鋳片の幅方向に並ぶ給水口列
と、その給水口列から一定の距離を持つ排水口列が交互
に設けてあり、給水口から流出する冷却水を排水口に流
入させることによりベルトと水膜冷却装置との間に冷却
水膜６を形成している。第１図では、この給水口列は、
数列で１つの流量制御系に含まれている。FIG. 1 shows a belt type continuous casting machine to which the method of the present invention is applied. In the figure, 1 is a belt, 2 is a guide roller, 9 is a flow control valve, and 10 is a flow meter. In this continuous casting machine, as shown in FIG. 2, the water film cooling device 3 performs water film cooling from the back surface of the belt. In this water film cooling device, as shown in FIG. 3, rows of water inlets arranged in the width direction of the slab and rows of drain holes having a certain distance from the row of water inlets are alternately provided. The cooling water film 6 is formed between the belt and the water film cooling device by causing the outflowing cooling water to flow into the drain port. In Figure 1, this water inlet row is
It is included in one flow rate control system in several sequences.
冷却水膜を流速および圧力は、ベルトの熱変形を防止す
る目的で流速５〜12.5m/s、冷却水膜切れをせずに鋳片
を支持する目的で圧力は溶湯ヘッドに見合う溶湯静圧と
つり合う圧力値となっている。The flow velocity and pressure of the cooling water film are 5 to 12.5 m / s for the purpose of preventing thermal deformation of the belt, and the pressure is suitable for supporting the cast slab without breaking the cooling water film. It is a pressure value that balances with.
（作 用） まずタンディッシュからモールドヘの注湯を終了した時
点でノ各冷却ゾーの代表点とベルト鋳型溶湯自由液面と
相対距離ａｉを測定する。タンディッシュから払い出さ
れた注湯が終了した時点から鋳片が引抜かれた距離ｂが
溶湯自由液面の下降量となるが、これは鋳片カウンダー
13で計測する。ａとｂをもとに溶湯自由液面と各冷却ゾ
ーンとの相対位置を逐次計算し、時々刻々の溶湯静圧を
算定して流量調節弁にてその時点での溶湯静圧とつり合
うように冷却水流量を制御するのである。(Operation) First, when the pouring from the tundish to the mold is finished, the relative distance a i between the representative point of each cooling zo and the free liquid surface of the belt mold melt is measured. The distance b from which the slab is drawn out from the time when the pouring out from the tundish is completed is the amount of descent of the molten metal free liquid level.
Measure with 13. The relative positions of the free surface of the molten metal and each cooling zone are calculated sequentially based on a and b, and the static pressure of the molten metal is calculated every moment so that the flow control valve balances the static pressure of the molten metal at that time. The cooling water flow rate is controlled.
次にこの発明の方法を適用しない場合につちて説明す
る。Next, a case where the method of the present invention is not applied will be described.
ダンディッシュからモールドへの注湯が終了し、連続鋳
造機内鋳片を引抜く時には、溶湯自由液面が徐々に下降
する。すなわち溶湯ヘッドが下降するため、冷却水膜圧
力が溶湯静圧より大きくなって第４図に示すように冷却
水膜厚さが厚くなり、鋳片を押しつぶすような力が働
く。When the pouring from the dundish into the mold is completed and the slab in the continuous casting machine is withdrawn, the molten metal free liquid level gradually drops. That is, since the molten metal head descends, the cooling water film pressure becomes larger than the molten metal static pressure, the cooling water film thickness becomes thicker as shown in FIG. 4, and a force for crushing the cast piece acts.
ベルト式連続鋳造機において鋳型の長辺側は、ベルトで
構成しているので未凝固溶湯が凝固してしまうまで鋳片
を支持し続けるが、短辺側は、第２図に示したように固
定鋳型12で一定の長さのみしか鋳片を支持していない。
したがって注湯が終了して最後端鋳片が短辺鋳型を通過
すると、冷却水膜によって押され、絞り出された未凝固
溶湯は、短辺鋳型側から流出してブリード現象となるの
である。In the belt type continuous casting machine, since the long side of the mold is composed of the belt, it continues to support the slab until the unsolidified molten metal is solidified, but the short side is as shown in FIG. The fixed mold 12 supports the slab only for a certain length.
Therefore, when pouring is completed and the tail end slab passes through the short-side mold, the unsolidified molten metal pressed and squeezed by the cooling water film flows out from the short-side mold side to cause a bleed phenomenon.
ブリート現象は、連続鋳造機内鋳片引抜き時に冷却水膜
圧力ＰＷが溶湯静圧ＰＳより大きくなるために鋳片が押
されて未凝固溶湯が流出する現象であるので、引抜き時
に、定常鋳造中における冷却水膜圧力を保持していて
は、このブリード現象は避けられない。したがってこの
発明の方法では、連続鋳造機内鋳片引抜き時に溶湯ヘッ
ドの低下に伴って冷却水膜圧力を低下させることによっ
て常に溶湯静圧とつり合う冷却水膜圧力を保ち、ブリー
ド現象を防止するのである。The burr phenomenon is a phenomenon in which the cooling water film pressure P W becomes larger than the molten metal static pressure P S during drawing of the cast in the continuous casting machine, so that the cast is pushed and the unsolidified melt flows out. This bleeding phenomenon is unavoidable if the pressure of the cooling water film inside is maintained. Therefore, according to the method of the present invention, the cooling water film pressure is lowered with the decrease of the molten metal head at the time of drawing out the cast piece in the continuous casting machine, so that the cooling water film pressure which is always in balance with the molten metal static pressure is maintained and the bleeding phenomenon is prevented. .
溶湯ヘッドの低下に伴って冷却水膜圧力を低下させる手
段として、冷却水流量を低下させることが挙げられる。
第５図に水膜冷却装置を冷却水膜特性を示す。同図から
流量を低下させることによって冷却水膜圧力は低下する
ことがわかる。したがって溶湯自由液面位置から計算さ
れる溶湯静圧といつり合うように冷却水流量を制御すれ
ばブリード現象は防止できる。As a means for lowering the cooling water film pressure as the molten metal head is lowered, it is possible to reduce the cooling water flow rate.
FIG. 5 shows the cooling water film characteristics of the water film cooling device. It can be seen from the figure that the cooling water film pressure decreases as the flow rate decreases. Therefore, the bleeding phenomenon can be prevented by controlling the flow rate of the cooling water so as to match the static pressure of the molten metal calculated from the position of the molten metal free liquid level.
この冷却水流量制御は、溶湯自由液面の低下に伴って無
段階に制御するのが理想であるが、第６図に示すように
多段に制御範囲を区分してステップ的に流量を制御して
も良い。この場合、冷却水膜圧力が理想曲線よりずれる
範囲は、鋳型によってできたシェルの耐圧範囲である１
kg/cm２以内が望ましい。This cooling water flow rate control is ideally controlled steplessly as the molten metal free liquid level decreases, but as shown in FIG. 6, the flow rate is controlled stepwise by dividing the control range into multiple stages. May be. In this case, the range in which the cooling water film pressure deviates from the ideal curve is the pressure resistance range of the shell formed by the mold.
Less than kg / cm 2 is desirable.
（実施例） 第１図に示した方法により、Ｃ：0.03 wt％（以下単に
％で示す）、Si：0.01％，Mn：0.30％，Ａｌ：0.020
％，Ｐ：0.20％およびＳ：0.15％を含有する組成になる
溶鋼を、冷却水流量を制御しながらベルト厚さ1.4 mmの
ベルト式連続鋳造機にて鋳込んで鋳片厚さ30mmの鋳片を
引抜いた。鋳込み中における最大溶鋼静圧は２kg/cm２
であり、最終鋳込メニスカス位置から短辺鋳型下端まで
の距離は750 mmであった。また冷却水流量制御は、前記
最終メニスカス位置から鋳片を1/3 引抜いた時点で水圧
を0.7 kg/cm２にステップ制御したものである。(Example) By the method shown in FIG. 1, C: 0.03 wt% (hereinafter simply referred to as%), Si: 0.01%, Mn: 0.30%, Al: 0.020
%, P: 0.20% and S: 0.15%, molten steel having a composition of 30 mm is cast by a belt type continuous casting machine with a belt thickness of 1.4 mm while controlling the cooling water flow rate. I pulled out a piece. The maximum static pressure of molten steel during casting is 2 kg / cm 2
And the distance from the final casting meniscus position to the lower end of the short side mold was 750 mm. The cooling water flow rate control is a step control in which the water pressure is 0.7 kg / cm 2 at the time when the cast slab is pulled out from the final meniscus position by 1/3.
この場合、ブリード現象は全く発生しなかった。In this case, the bleeding phenomenon did not occur at all.
（発明の効果） この発明によってブリード地金発生防止が可能となり、
鋳造時間率の向上を図ることができ、地金散乱による操
業トラブルが皆無となった。(Effects of the Invention) This invention makes it possible to prevent the occurrence of bleed metal,
We were able to improve the casting time rate, and there were no operating problems due to metal scattering.
第１図は、この発明の方法を適用するベルト式連続鋳造
機を示す図、 第２図は、ベルト式連続鋳造機を示す図、 第３図は、ベルト式連続鋳造機の水膜冷却装置を示す図
で、同時(a) は正面図、同図(b) は側面図、 第４図は、鋳片引抜時の冷却水膜挙動を示す図で、同図
(a) は通常鋳込時の冷却水膜挙動を示す図、同図(b) は
注湯終了後の冷却水膜挙動を示す図、 第５図は、冷却水膜厚さと冷却水膜圧力と冷却水水量と
の関係を示すグラフ、 第６図は、冷却水の制御方法を示すグラフである。 １……ベルト、２……ガイドローラ ３……水膜冷却装置、４……鋳片 ５……ピンチローラ、６……冷却水膜 ７……給水ヘッダー、８……排水ヘッダー ９……流量制御弁、10……流量計 11……タンディッシュ、12……短辺鋳型 13……鋳片カウンターFIG. 1 is a view showing a belt type continuous casting machine to which the method of the present invention is applied, FIG. 2 is a view showing a belt type continuous casting machine, and FIG. 3 is a water film cooling device of the belt type continuous casting machine. The same figure (a) is a front view, the same figure (b) is a side view, and FIG. 4 is a view showing the behavior of the cooling water film at the time of drawing the cast piece.
(a) is a diagram showing the behavior of the cooling water film during normal casting, (b) is a diagram showing the behavior of the cooling water film after the completion of pouring, and Fig. 5 is the cooling water film thickness and cooling water film pressure. Is a graph showing the relationship between the cooling water amount and FIG. 6, and FIG. 6 is a graph showing the cooling water control method. 1 ... Belt, 2 ... Guide roller 3 ... Water film cooling device, 4 ... Cast piece 5 ... Pinch roller, 6 ... Cooling water film 7 ... Water supply header, 8 ... Drainage header 9 ... Flow rate Control valve, 10 ... Flow meter 11 ... Tundish, 12 ... Short side mold 13 ... Slab counter
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山田 博右 千葉県千葉市川崎町１番地 川崎製鉄株式 会社千葉製鉄所内 (72)発明者 木村 智明 茨城県日立市幸町３―１―１ 株式会社日 立製作所日立工場内 (56)参考文献 特開 昭57−100851（ＪＰ，Ａ) 特開 昭60−54247（ＪＰ，Ａ) 特開 昭60−108145（ＪＰ，Ａ) 特開 昭60−152347（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hirosuke Yamada 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Chiba Works (72) Inventor Tomoaki Kimura 3-1-1, Saiwai-cho, Hitachi, Ibaraki (56) Reference JP-A-57-100851 (JP, A) JP-A-60-54247 (JP, A) JP-A-60-108145 (JP, A) JP-A-60-152347 (JP, A)
Claims (1)
液圧の冷却媒体膜によってベルト鋳型を支持するベルト
式連続鋳造機における鋳造操業終了方法であって、 タンディッシュからの注湯を終了して鋳型内の溶湯を払
い出すに際し、 冷却媒体膜を形成させる水膜冷却装置による冷却ゾーン
を、引き抜き方向へ複数個に区分しておき、 注湯終了に伴う鋳型内の溶湯自由液面の降下量を計測す
ることにより、該溶湯自由液面と、区分された各冷却ゾ
ーンとの相対距離の変化を逐次に計算し、 この計算結果に基づいて冷却ゾーンのそれぞれに対応す
る溶湯静圧の減少量を計算して、 この静圧減少量につり合うだけ冷却媒体用の液圧を逐次
に低下させることを特徴とするベルト式連続鋳造機にお
ける鋳造操業終了方法。1. A method for terminating casting operation in a belt type continuous casting machine, which supports a belt mold by means of a liquid cooling medium film that balances the molten metal static pressure acting on the belt mold, wherein pouring from a tundish is completed. When the molten metal in the mold is discharged by dividing the cooling zone by the water film cooling device that forms the cooling medium film into multiple parts in the drawing direction, the free liquid level in the mold drops when the pouring is completed. By measuring the amount, the change in the relative distance between the molten metal free liquid surface and each of the divided cooling zones is sequentially calculated, and the molten metal static pressure corresponding to each cooling zone is reduced based on this calculation result. A method for terminating a casting operation in a belt type continuous casting machine, characterized in that the amount of fluid is calculated and the hydraulic pressure for the cooling medium is successively reduced by an amount commensurate with this amount of static pressure reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26177187A JPH0620609B2 (en) | 1987-10-19 | 1987-10-19 | Ending method of casting operation in belt type continuous casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26177187A JPH0620609B2 (en) | 1987-10-19 | 1987-10-19 | Ending method of casting operation in belt type continuous casting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01104448A JPH01104448A (en) | 1989-04-21 |
| JPH0620609B2 true JPH0620609B2 (en) | 1994-03-23 |
Family
ID=17366468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26177187A Expired - Lifetime JPH0620609B2 (en) | 1987-10-19 | 1987-10-19 | Ending method of casting operation in belt type continuous casting machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0620609B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0323041A (en) * | 1989-06-20 | 1991-01-31 | Kawasaki Steel Corp | Method for controlling cooling in belt type continuous casting machine |
| JP2680470B2 (en) * | 1990-09-14 | 1997-11-19 | 新日本製鐵株式会社 | Belt cooling method of twin belt type continuous casting machine |
-
1987
- 1987-10-19 JP JP26177187A patent/JPH0620609B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01104448A (en) | 1989-04-21 |
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