JPH0616924B2 - Continuous casting method for thin slabs - Google Patents
Continuous casting method for thin slabsInfo
- Publication number
- JPH0616924B2 JPH0616924B2 JP8620486A JP8620486A JPH0616924B2 JP H0616924 B2 JPH0616924 B2 JP H0616924B2 JP 8620486 A JP8620486 A JP 8620486A JP 8620486 A JP8620486 A JP 8620486A JP H0616924 B2 JPH0616924 B2 JP H0616924B2
- Authority
- JP
- Japan
- Prior art keywords
- fixed side
- cooling body
- molten metal
- speed
- shell
- 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
- B22D11/0605—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 belts, e.g. Hazelett-process
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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） 本発明は、薄鋳片を連続鋳造させる際、初期凝固シェル
が破断したり、固定側面冷却体に焼き付くこと防止する
分野に関するものである。Description: TECHNICAL FIELD The present invention relates to the field of preventing breakage of an initially solidified shell or seizure of a fixed side surface cooling body during continuous casting of thin cast pieces.
（従来の技術） 従来、一定の距離にわたって溶湯を保持するための間隙
を維持して循環する一対の対向して配置された可動ベル
トと、それらの可動ベルトの両側縁部に対向して配置さ
れた固定側面冷却体で形成された空間に、この固定側面
冷却体に当接する溶湯供給ノズルから溶湯を供給して鋳
造する方法が提案されている。しかし、この方法は固定
側面冷却体が固定されているために、この固定側面冷却
体上に形成される初期凝固シェルの引張強度が、このシ
ェルと固定側面冷却体との間の摩擦力よりも小さくなる
と、シェルが破断して固定側面冷却体の上に停滞するた
めに、そのまま鋳造するとブレークアウトにつながる。
そのようなブレークアウトは一般に拘束性ブレークアウ
トと呼ばれるもので、第１図に示すような段階を経てブ
レークアウトが起きる。即ち、固定側面冷却体上に停止
しているシェル16と移動しているシェル18との間に最も
薄いシェル17が形成される。このシェル17が固定側面冷
却体14出側まで移動する前に、固定側面冷却体上に停滞
しているシェル16が固定側面冷却体から離れて移動して
いるシェル18とともに移動すれば、第1a図に示すように
連続的に鋳造することが可能である。しかし、固定側面
冷却体上に停滞しているシェル16が固定側面冷却体から
離れない場合は、第1b図に示すように固定側面冷却体14
の出側で溶鋼15が洩れ、所謂拘束性ブレークアウトが発
生する。また、固定側面冷却体に凝固シェルが焼き付い
た場合も同様な現象が発生する。(Prior Art) Conventionally, a pair of movable belts that are arranged to face each other and circulate while maintaining a gap for holding a molten metal over a certain distance, and are arranged to face both side edges of the movable belts. There has been proposed a method of supplying molten metal to a space formed by the fixed side surface cooling body from a molten metal supply nozzle which is in contact with the fixed side surface cooling body and casting the molten metal. However, since the fixed side cooling body is fixed in this method, the tensile strength of the initially solidified shell formed on the fixed side cooling body is larger than the frictional force between the shell and the fixed side cooling body. When it becomes smaller, the shell breaks and stagnates on the fixed side surface cooling body, which leads to breakout when cast as it is.
Such a breakout is generally called a constrained breakout, and the breakout occurs through the steps shown in FIG. That is, the thinnest shell 17 is formed between the stationary shell 16 and the moving shell 18 on the fixed side surface cooling body. Before this shell 17 moves to the fixed side cooling body 14 exit side, if the shell 16 stagnating on the fixed side cooling body moves with the shell 18 moving away from the fixed side cooling body, It is possible to continuously cast as shown in the figure. However, when the shell 16 stagnant on the fixed side surface cooling body does not separate from the fixed side surface cooling body, as shown in FIG.
Molten steel 15 leaks on the outlet side of the so-called so-called restrained breakout occurs. The same phenomenon occurs when the solidified shell is seized on the fixed side surface cooling body.
そこで、凝固シェルが固定側面冷却体に焼き付くことに
起因するブレークアウトを防止する技術として、対向し
た一対の無端ベルトの両側縁部に配置された本発明の固
定側面冷却体に相当する支持冷却部材に微振動を与えて
凝固シェルが支持冷却部材に焼き付かないようにするこ
とが特開昭59-153553号公報に提案されている。Therefore, as a technique for preventing breakout due to seizure of the solidified shell on the fixed side surface cooling body, a supporting cooling member corresponding to the fixed side surface cooling body of the present invention disposed on both side edge portions of the pair of endless belts facing each other. Japanese Patent Application Laid-Open No. 59-153553 proposes that the solidified shell is not seized on the supporting cooling member by applying a slight vibration to the support cooling member.
また、移動鋳型を有する金属の連続鋳造装置で、鋳型の
移動速度を一定の鋳片移動速度よりも大きい一定速度に
することにより、移動鋳型が凝固殻と固着することを防
止することが、特開昭56-165543号公報に提案されてい
る。Further, in a metal continuous casting apparatus having a moving mold, it is possible to prevent the moving mold from sticking to the solidified shell by setting the moving speed of the mold to a constant speed that is higher than a constant moving speed of the cast piece. It is proposed in Japanese Laid-Open Publication No. 56-165543.
（問題点を解決するための手段） しかし、前述した前者の技術は溶湯供給ノズルが支持冷
却部材に当接している構造となっているために、微振動
を与えると溶湯供給ノズルと支持冷却部材との間に間隙
が生じたり、溶湯供給ノズルの先端部が欠損することが
あった。このために、この部分に溶湯が差し込むことに
よって鋳片の表面性状が悪化したり、ブレークアウトが
発生する問題があり、前記特開昭59-153553 号公報の固
定側面冷却体に微振動を与える技術を適用できない。(Means for Solving Problems) However, the former technique described above has a structure in which the molten metal supply nozzle is in contact with the supporting cooling member, and therefore, when a slight vibration is applied, the molten metal supply nozzle and the supporting cooling member are provided. In some cases, a gap was formed between the molten metal and the molten metal, or the tip of the melt supply nozzle was damaged. For this reason, there is a problem that the surface quality of the slab is deteriorated and the breakout occurs due to the molten metal being inserted into this portion, and a slight vibration is given to the fixed side surface cooling body of the above-mentioned JP-A-59-153553. Technology cannot be applied.
また、後者の技術では、無端ベルトで冷却・凝固した初
期凝固シェルは一定速度で引き抜かれており、無端ベル
トと同期して引き抜かれているシェルと固定側面冷却体
上で冷却・凝固し停滞しているシェルとの境界にはすべ
り摩擦が発生する。このすべり摩擦力により、固定側面
冷却体上で停滞しているシェルは固定側面冷却体から引
離されるが、この現象は一定していないので、ブレーク
アウトの危険性がある。Also, in the latter technique, the initial solidified shell cooled and solidified by the endless belt is pulled out at a constant speed, and it cools and solidifies on the shell and the fixed side surface cooling body that are pulled out synchronously with the endless belt and stagnates. Sliding friction occurs at the boundary with the shell. Due to this sliding frictional force, the shell stagnant on the fixed side surface cooling body is separated from the fixed side surface cooling body, but since this phenomenon is not constant, there is a risk of breakout.
（問題点を解決するための手段） 本発明は、第３図、第４図および第５図に示すような溶
湯供給ノズルが固定側面冷却体に当接する構造の連続鋳
造機により薄鋳片を連続鋳造する際に、薄鋳片の引抜き
速度VCと一対の無端ベルトあるいはいずれか一方の無端
ベルトの回転移動速度VBとを周期的に変化させることで
前記問題点を解決した。(Means for Solving the Problems) The present invention uses a continuous casting machine having a structure in which a molten metal supply nozzle is in contact with a fixed side surface cooling body as shown in FIGS. 3, 4, and 5 to produce thin cast pieces. In continuous casting, the above problems were solved by periodically changing the drawing speed V C of the thin cast piece and the rotational movement speed V B of the pair of endless belts or one of the endless belts.
また、上記薄鋳片の引抜き速度VCと無端ベルトの回転移
動速度VBを周期的に変化させる態様としては、第2aおよ
び第2b図に示すように無端ベルトの回転移動速度の波形
と薄鋳片の引抜き速度の波形とを一致させ、各瞬時にお
ける各速度を一致させる態様も含まれる。Further, as a mode of periodically changing the drawing speed V C of the thin slab and the rotational movement speed V B of the endless belt, as shown in FIGS. 2a and 2b, the waveform of the rotational movement speed of the endless belt and the thin A mode is also included in which the waveform of the withdrawal speed of the slab is made to match and the respective speeds at each instant are made to match.
上述した無端ベルトの回転移動速度VBおよび薄鋳片の引
抜き速度VCを周期的に変化させる電気的手段としては、
各々の速度を常に検知して予め設定した周期1/f（ｆは
振動数）および振幅ａ、さらにパルス幅ｂに合うよう
に、無端ベルトおよびピンチロールの駆動モーターの回
転数を制御する。前記2a図および第2b図に示した薄鋳片
の引抜き速度VCと無端ベルトの回転移動速度VBの周期1/
fは、実験の結果、初期凝固シェルの引抜き速度をVC、
固定側面冷却体の長さに等しい１サイクル当たりのピッ
チをLnすると つまり１回の無端ベルトおよび薄鋳片引抜き速度の周期
的な速度により初期凝固シェルが間欠的に引き抜かれる
ピッチが０mmより大きく固定側面冷却長さ未満になるよ
うに周期1/fを設定し、また振幅ａは 以上に設定し、さらにはパルス幅ｂは２sec 未満にする
とよい。As the electrical means for periodically changing the rotational movement speed V B of the endless belt and the drawing speed V C of the thin cast piece,
The speeds of the drive motors for the endless belt and the pinch rolls are controlled so that the respective speeds are constantly detected and the preset cycle 1 / f (f is the frequency), amplitude a, and pulse width b are met. Cycle 1 / of the drawing speed V C of the thin cast piece and the rotational movement speed V B of the endless belt shown in FIGS. 2a and 2b
f is the result of the experiment, the extraction speed of the initial solidified shell is V C ,
If the pitch per cycle equal to the length of the fixed side cooling body is L n That is, the cycle 1 / f is set so that the pitch at which the initial solidified shell is intermittently drawn out by the endless belt and the cyclic speed of the thin slab drawing speed is greater than 0 mm and less than the fixed side surface cooling length, The amplitude a is The pulse width b may be set to the above and the pulse width b may be less than 2 sec.
また、第2c図に示すように無端ベルトの回転移動速度VB
と薄鋳片引抜き速度VCを周期的に変化させる場合も、無
端ベルトの回転移動速度VBの周期1/f1および振幅a1や薄
鋳片の引抜き速度VCの周期1/f2および振幅a2は、前記第
2a図におけると同様に与えればよいが、望ましくは1/f2
＜1/f2にするとよい。Further, as shown in FIG. 2c, the rotation speed V B of the endless belt is
Even if the drawing speed V C of the thin slab is changed periodically, the cycle 1 / f 1 of the rotational movement speed V B of the endless belt and the amplitude a 1 and the cycle 1 / f 2 of the drawing speed V C of the thin slab And the amplitude a 2 is
It can be given as in Fig. 2a, but preferably 1 / f 2
<1 / f 2 is recommended.
（作 用） 本発明法は、無端ベルトの回転移動速度VBと鋳片引抜き
速度VCを周期的に変化させることにより、この周期的な
速度変化に対応してべり摩擦力を周期的に変化させるこ
とができ、固定側面冷却体上に停滞している初期凝固シ
ェルを周期的に引き離すことが可能となる。(Operation) According to the method of the present invention, the sliding frictional force is cyclically changed in response to this cyclical speed change by cyclically changing the rotational movement speed V B of the endless belt and the slab drawing speed V C. It can be varied and allows the initial solidified shell, which is stagnant on the fixed side cooling body, to be periodically pulled away.
また、無端ベルトの回転移動速度と鋳片引抜き速度の周
期的な速度変化により初期凝固シェルに振動を与えるの
で、固定側面冷却体に当接している溶湯供給ノズルおよ
び固定側面冷却体には、殆ど振動が伝播されない。In addition, since the initial solidification shell is vibrated by the periodic speed change of the rotational movement speed of the endless belt and the slab withdrawal speed, the molten metal supply nozzle and the fixed side surface cooling body which are in contact with the fixed side surface cooling body are almost Vibration is not propagated.
（実施例１） 注入ノズル９からの溶湯を溶湯保持容器５および溶湯供
給ノズル３を介して、駆動ロール８、テンションロール
７および入側ロール４により回転移動し水膜冷却箱６で
背面を冷却している無端ベルト１と図示しない長さ300m
mの固定側面冷却体で形成された空間に溶湯15を注入す
る装置を第３図に示す。この装置を用いて、厚さ20mm、
幅600mmの薄鋳片(SS41)を平均５m/minの鋳片引抜き速度
V0で引き抜き、上下の無端ベルトの回転移動速度VBおよ
び初期凝固シェルの引抜き速度VCを、第1a図に示すよう
にV0を基準としてａsin2 πftとなるように周期的に変
動させて鋳造した。なお、この時のａを０．３m/minと
し、ｆを60回/minに設定した。(Example 1) The molten metal from the injection nozzle 9 is rotatably moved by the drive roll 8, the tension roll 7 and the inlet roll 4 through the molten metal holding container 5 and the molten metal supply nozzle 3, and the back surface is cooled by the water film cooling box 6. Endless belt 1 and 300m length not shown
FIG. 3 shows an apparatus for injecting the molten metal 15 into the space formed by the fixed side surface cooling body of m. Using this device, thickness 20mm,
Thin strip with a width of 600 mm (SS41) has an average slab drawing speed of 5 m / min
Pulling at V 0, the drawing speed V C of the rotational moving speed V B and the initial solidified shell of the upper and lower endless belt, and periodically varied so as to asin2 πft the V 0 as a reference, as shown in Figure 1a Cast. At this time, a was set to 0.3 m / min and f was set to 60 times / min.
（実施例２） 実施例１と同一サイズの鋳片を平均鋳片引抜き速度
（V0）７m/minで引き抜いた。この際、無端ベルトの回
転移動速度VBおよび初期凝固シェルの引抜き速度VCを第
2b図のパターンで、ａを０．５m/min、ｂを０．２〜
０．３秒、ｆを60回/minに設定した。(Example 2) A slab of the same size as in Example 1 was drawn at an average slab drawing speed (V 0 ) of 7 m / min. At this time, the rotational movement speed V B of the endless belt and the drawing speed V C of the initial solidified shell are set to
In the pattern shown in Fig. 2b, a is 0.5 m / min and b is 0.2-
0.3 seconds, f was set to 60 times / min.
（実施例３） 厚さ10mm、幅600mmの薄鋳片(SPCC)をV0＝10m/min，VBの
平均地11m/min，f1＝60回/min，f2＝30回/min，a1＝0.3
0m/min，a2＝0.15m/min，Ln＝450として鋳造した。(Example 3) A thin cast slab (SPCC) having a thickness of 10 mm and a width of 600 mm was V 0 = 10 m / min, an average V B of 11 m / min, f 1 = 60 times / min, f 2 = 30 times / min. , A 1 = 0.3
Casting was carried out at 0 m / min, a 2 = 0.15 m / min, and L n = 450.
比較のため従来のように引抜き速度と無端ベルトの回転
移動速度を定速とし、鋳造した結果を第１表に示す。For comparison, as in the prior art, the drawing speed and the rotational movement speed of the endless belt were set to constant speeds, and the results of casting are shown in Table 1.
この表からもわかるように、完鋳率は43％から100％に
増加し、鋳片の表面は美麗で、無端ベルトの周期的な速
度変化に対応したリップルマークが鋳片側面に見られる
ものの、シェルが固定側面冷却体に焼き付き不規則な停
滞と解放を繰り返したと考えられる多数のブレークアウ
トマークは全く観察されず、溶湯供給ノズルの破損もな
かった。 As can be seen from this table, the complete casting rate increased from 43% to 100%, the surface of the slab was beautiful, and ripple marks corresponding to the periodic speed change of the endless belt were seen on the side of the slab. No large number of breakout marks, which are considered to have been caused by the shell seizing on the fixed side surface cooling body and repeating irregular stagnation and release, were observed, and the melt supply nozzle was not damaged.
（発明の効果） 以上説明したように本発明によれば、初期凝固シェルが
破断したり固定側面冷却体に焼き付くことによるブレー
クアウトは全く発生せず、溶湯供給ノズルの破損も起こ
さずに、表面が美麗な鋳片を製造することが可能とな
る。(Effects of the Invention) As described above, according to the present invention, no breakout occurs due to breakage of the initial solidified shell or seizure of the fixed side surface cooling body, and no damage to the molten metal supply nozzle occurs. It is possible to produce beautiful slabs.
第1a図および第1b図は、固定側面冷却体上に形成される
シェルを示す図、 第2a図，第2b図および第2c図は、無端ベルトの回転移動
速度VB、初期凝固シェルの引抜き速度VCおよび平均鋳片
引抜き速度V0との関係を表す図、 第３図、第４図および第５図は、本発明の方法に使用す
る装置を示す図である。 １……無端ベルト、２……ピンチロール ３……溶湯供給ノズル、４……入側ロール ５……溶湯保持容器、６……水膜冷却箱 ７……テンションロール、８……駆動ロール ９……注入ノズル、10……不活性ガス入口 11……雰囲気調整カバー、12……薄鋳片 13……曲げロール、14……固定側面冷却体 15……溶湯、16……停滞シェル 17……薄いシェル、18……移動シェルFIGS. 1a and 1b are views showing a shell formed on a fixed side surface cooling body, and FIGS. 2a, 2b and 2c are a rotational movement speed V B of an endless belt and a withdrawal of an initial solidification shell. FIG. 3, FIG. 4, FIG. 5, and FIG. 5, which show the relationship between the velocity V C and the average slab drawing velocity V 0 , are diagrams showing the apparatus used in the method of the present invention. 1 ... Endless belt, 2 ... Pinch roll, 3 ... Molten metal supply nozzle, 4 ... Inlet roll, 5 ... Melt holding container, 6 ... Water film cooling box, 7 ... Tension roll, 8 ... Drive roll, 9 …… Injection nozzle, 10 …… Inert gas inlet 11 …… Atmosphere adjusting cover, 12 …… Thin cast piece 13 …… Bending roll, 14 …… Fixed side cooling body 15 …… Melting metal, 16 …… Stagnant shell 17 …… … Thin shell, 18… Moving shell
───────────────────────────────────────────────────── フロントページの続き (72)発明者 野崎 努 千葉県千葉市川崎町１番地 川崎製鉄株式 会社技術研究本部内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsutomu Nozaki 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Technical Research Division
Claims (2)
間隙を維持しつつ循環する一対の対向して配置された循
環体と、それらの循環体の両側縁部に対向して配置され
た固定側面冷却体とで形成された空間に、該固定側面冷
却体と当接した溶湯供給ノズルから溶湯を供給して薄鋳
片を連続鋳造する方法において、前記循環体の回転移動
速度と引き抜かれる鋳片の引抜速度を周期的に変化させ
ながら鋳造することを特徴とする薄鋳片の連続鋳造方
法。1. A pair of circulating bodies arranged so as to circulate while maintaining a gap for holding a molten metal over a certain distance, and fixed side faces arranged so as to face both side edges of the circulating bodies. In a method of continuously casting a thin cast piece by supplying a molten metal from a molten metal supply nozzle in contact with the fixed side surface cooling body to a space formed by a cooling body, a rotational movement speed of the circulating body and a cast piece to be withdrawn A method for continuously casting thin slabs, characterized in that casting is performed while periodically changing the drawing speed of the slab.
き速度の波形とを一致させ、各瞬時における各速度を一
致させることを特徴とする特許請求の範囲第１項記載の
薄鋳片の連続鋳造方法。2. The thin casting according to claim 1, wherein the waveform of the rotational movement speed of the circulating body and the waveform of the withdrawal speed of the slab are made to coincide with each other so that the respective speeds at each moment are made to coincide with each other. Continuous casting method for pieces.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8620486A JPH0616924B2 (en) | 1986-04-16 | 1986-04-16 | Continuous casting method for thin slabs |
| KR1019860005093A KR940008621B1 (en) | 1985-06-27 | 1986-06-25 | Casting method & apparatus for endless strip |
| AU59358/86A AU588335B2 (en) | 1985-06-27 | 1986-06-26 | Method and apparatus for casting endless strip |
| BR8602964A BR8602964A (en) | 1985-06-27 | 1986-06-26 | PROCESS AND APPARATUS FOR THE ENGINEERING OF A METAL STRIP |
| CA000512549A CA1278415C (en) | 1985-06-27 | 1986-06-26 | Method and apparatus for casting endless strip |
| EP86401432A EP0210891B1 (en) | 1985-06-27 | 1986-06-27 | Method and apparatus for casting endless strip |
| US06/879,278 US4735254A (en) | 1985-06-27 | 1986-06-27 | Method and apparatus for casting endless strip |
| DE8686401432T DE3683099D1 (en) | 1985-06-27 | 1986-06-27 | METHOD AND DEVICE FOR CASTING ENDLESS SHEET METAL TAPES. |
| AT86401432T ATE70753T1 (en) | 1985-06-27 | 1986-06-27 | METHOD AND DEVICE FOR CASTING ENDLESS METAL STRIPS. |
| US07/102,114 US4817702A (en) | 1985-06-27 | 1987-09-29 | Apparatus for casting endless strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8620486A JPH0616924B2 (en) | 1986-04-16 | 1986-04-16 | Continuous casting method for thin slabs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62244554A JPS62244554A (en) | 1987-10-24 |
| JPH0616924B2 true JPH0616924B2 (en) | 1994-03-09 |
Family
ID=13880245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8620486A Expired - Lifetime JPH0616924B2 (en) | 1985-06-27 | 1986-04-16 | Continuous casting method for thin slabs |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0616924B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6908964B2 (en) | 2000-12-28 | 2005-06-21 | General Electric | Method for the preparation of a poly(arylene ether)-polyolefin composition, and composition prepared thereby |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113878099B (en) * | 2021-10-12 | 2023-06-02 | 山东理工大学 | Method for inhibiting temperature downlink of reflux zone and double-roller casting and rolling system applying method |
-
1986
- 1986-04-16 JP JP8620486A patent/JPH0616924B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6908964B2 (en) | 2000-12-28 | 2005-06-21 | General Electric | Method for the preparation of a poly(arylene ether)-polyolefin composition, and composition prepared thereby |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62244554A (en) | 1987-10-24 |
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