JPS6096354A - Cooling pad for continuous casting machine for thin walled billet - Google Patents

Abstract

PURPOSE:To form a uniform and stable water film on the surface of metallic belts and to eliminate uneven cooling by forming the respective sectional areas of feed and discharge holes for cooling water opened to cooling pads and the disposition thereof in a way as to meet the prescribed equation. CONSTITUTION:A titled pad consists of opening feed and discharge holes 15, 16 to cooling pads 7, 8 which eject cooling water flow on the rear surfaces of metallic belts 4, 5 of a continuous casting machine for a thin walled billet. The respective sectional areas of said feed and discharge holes 15, 16 and disposition thereof are set at 0.5<=Ai<=7, Ai/A0>=1.1n, lc20 [where Ai: sectional area of the feed holes (cm<2>), A0: the sectional area of the discharge holes (cm<2>), lc: the distance between the centers of the feed and discharge holes (cm), n: the parameter depending on the disposition of the feed and discharge holes and 0.5 with the triangular disposition, 1 with the square disposition and 2 with the hexagonal disposition]. The above-described continuous casting machine for the thin-walled billet is formed of a pair of the belts 4, 5 which move cyclically and a pair of side plates on the short surface sides of a billet 11.

Description

【発明の詳細な説明】 技　術　分　野 溶融金属とくに溶鋼から厚さが８０鋪以下の薄肉鋳片（
シートバー等）を直接製造する薄肉鋳片連続鋳造機（以
下ベルトキャスターという）の流体（水）膜冷却装置（
冷却パッド）について１冷水の給水孔、排水孔の寸法、
配置を望ましい冷却水流水膜を形成するように改良した
も゛のであ゛る。[Detailed description of the invention] Technical field: Thin slabs (thin slabs with a thickness of 80 mm or less) made from molten metal, especially molten steel.
A fluid (water) film cooling device (
Regarding cooling pad) 1. Dimensions of cold water supply hole and drainage hole,
The arrangement has been improved to form a desirable cooling water film.

従来技術とその問題点 溶鋼から直接シートバーの如き鋼板を連続的にに製造す
る連続鋳造機雷ベルトキャスターとして、例えば特開昭
５７−１００８５１号として開示されたようなものがあ
る。その開示のような同期式のベルトキャスターには種
々の形式のものがあるが、第１図にその代表的な例を示
す。通常該ベルトキャスターは、所定の距離にわたって
溶鋼２を保持するための間隙を維持しつつ、それぞれ複
数個のガイドｏ−ル６　ａ　１６　ｂ　ｅ　６０　ａ　
６　’　ａ　ａ６’ｂ、６’Ｏを介して軸回移動する対
向配置した一対の背面が冷却水膜で冷却されている金属
ベルト４．５と、それら両金属ベルト４．５相互の間に
挾まれて各側縁近傍で繁密に接した一対の固定側板とで
４方を限局し鋳造空間を構成してなる構造を有する。Prior Art and Problems There is a continuous casting mine belt caster for continuously manufacturing steel plates such as sheet bars directly from molten steel, such as the one disclosed in Japanese Patent Application Laid-Open No. 57-100851. There are various types of synchronous belt casters as disclosed therein, and a typical example is shown in FIG. Usually, the belt caster has a plurality of guide wheels 6a, 16b, 60a, and 60a, respectively, while maintaining a gap for holding the molten steel 2 over a predetermined distance.
A pair of opposing metal belts 4.5 whose back surfaces are cooled by a cooling water film move axially through 6'a a6'b and 6'O, and a metal belt 4.5 between the two metal belts 4.5. It has a structure in which a casting space is defined on four sides by a pair of stationary side plates that are sandwiched and closely contacted near each side edge.

なお、図示の１はタンディシュ、８は注入ノズル、７．
８は上記金属ベルト４，５の背面にあって該ベルトを内
側の溶鋼の静圧を冷却水流水膜の圧力で支持し冷却する
ための冷却パッド、９゜１０はベルト張設ばね、１１は
鋳造鋳片を示す。In the figure, 1 is a tundish, 8 is an injection nozzle, and 7.
8 is a cooling pad located on the back side of the metal belts 4 and 5 for cooling the belt by supporting the static pressure of the molten steel inside with the pressure of the cooling water film; 9; 10 is a belt tensioning spring; 11 is a cooling pad; A cast slab is shown.

さて、上記冷却パッド７．８の機能としては、（８） 湯面から鋳片引抜き方向に向うに随って溶鋼もしくは半
凝固鋳片による静圧が変化するので、＠造生成物の各段
階（＠片引抜き方向の各位置）での上記溶鋼静圧と冷却
流水田とがつり合うように、冷却パッドの金属ベルトに
面した導入孔先端に設けた冷却水の液溜め窪みの大きさ
、配置、そこに供給する流量を調節していた。Now, the function of the cooling pad 7.8 is as follows: (8) Since the static pressure due to molten steel or semi-solidified slab changes as it moves from the molten metal surface in the slab drawing direction, The size and arrangement of the cooling water reservoir depression provided at the tip of the introduction hole facing the metal belt of the cooling pad so that the above-mentioned static pressure of molten steel at each position in the single withdrawal direction and the cooling flow field are balanced. , and adjusted the flow rate supplied there.

第２および８図は、こうした従来の冷却パッド７．８に
採用している構造を示すもので、金桐ベルト４，５に面
する側に、冷却水を流出させるための各給水孔１５先端
部分に多数の長円形（ａＸｂ）窪み１２を設け、該金属
ベル）４．５と冷却パッド７．８との間に冷却水流水膜
を形成し、溶鋼静圧に対処するとともにベルトの均一冷
却を果すようになっている。なお、上記長円形窪み１２
の寸法としては、短径（ａ）　＋　５０〜１５０ｍ＋＋
＋、長径（ｂ）　：　１００〜２００闘で、配置は横間
隔（ｚ、　）　１２００〜４ＱＯｓｍ、縦間隔（Ｊ、）
：２’ＯＯ〜６００程度のものが普通である。Figures 2 and 8 show the structure adopted in such a conventional cooling pad 7.8, in which the tip of each water supply hole 15 for cooling water to flow out is provided on the side facing the metal paulownia belts 4, 5. A large number of oval (aXb) depressions 12 are provided in the section to form a cooling water film between the metal bell 4.5 and the cooling pad 7.8 to cope with the static pressure of molten steel and to uniformly cool the belt. It is designed to accomplish the following. In addition, the above-mentioned oval recess 12
The dimensions are short axis (a) + 50 to 150 m++
+, major axis (b): 100-200 fights, horizontal spacing (z, ) 1200-4QOsm, vertical spacing (J, )
: About 2'OO to 600 is normal.

このような従来冷却パッドの構造では、薄肉ス（４） ラブやシートバーを連続鋳造すると、窪み１２部分に形
成される水流部１４とそれ以外の面に形成されろ水膜部
１８とでは液流の速度が著しく異なり冷却強度に差が出
る。In such a conventional cooling pad structure, when thin-walled slabs (4) or sheet bars are continuously cast, liquid flows between the water flow portion 14 formed in the recess 12 portion and the drainage film portion 18 formed on the other surface. The flow speed is significantly different, resulting in a difference in cooling intensity.

そうした冷却の差があると、上記金属ベルトが変形し波
状を呈するに至る。その結果、該金属ベルト４．５と固
定側板との液密接触が害され、隙間を生じて溶鋼が浅田
し、鋳造事故やフィンをもつなど形状不良鋳片を発生す
る。さらに、鋳片表面が平滑にならず、そのため圧延後
の薄鋼板の表面形状にも影暢して品質劣化を招く欠点が
あった。Such a difference in cooling causes the metal belt to deform and take on a wavy appearance. As a result, the liquid-tight contact between the metal belt 4.5 and the stationary side plate is impaired, creating a gap where molten steel spills, leading to casting accidents and slabs with fins or other defects in shape. Furthermore, the surface of the slab is not smooth, which affects the surface shape of the thin steel sheet after rolling, resulting in quality deterioration.

発　明　の　目　的 本発明の目的は、従来の水膜部１８と水流部１４とで金
楓ベルトの背面を冷却する形式の冷却パッドのもつ欠点
を、溶鋼の静圧につり合う冷却水流水膜の形成を給水孔
と排水孔との後述するような配置によって吏服し、鋳造
作業事故や鋳片品質の劣化を防止するところにある。OBJECTS OF THE INVENTION It is an object of the present invention to solve the drawbacks of the conventional cooling pad of the type that cools the back side of the gold maple belt using the water film part 18 and the water flow part 14, by providing a cooling water flow film that balances the static pressure of molten steel. By arranging the water supply hole and drainage hole as described below, the formation of the water supply hole and the drainage hole are prevented, thereby preventing accidents in the casting operation and deterioration of the quality of the slab.

発　明　の　構　成 本発明は、ベルトキャスターの冷却パッド７゜８に対し
、金属ベルト４．５に面して開口させた多数の給水孔１
５と同時に多数の排水孔１６を設けると共に、それらの
大きさ、配置につき、モデル実験によって、冷却水流水
膜の流速分布の観察や熱伝導係数の測定、および実規模
機による測定結果を通じ、次のような条件を満足するよ
うに構成した点に特徴を有する。すなわち、 （１）給水孔１５は金属ベルト４＃５の背面に臨んで、
多数ができるだけ均一に分散していること。Structure of the Invention The present invention provides a cooling pad 7°8 of a belt caster with a large number of water supply holes 1 opened facing the metal belt 4.5.
At the same time as 5, a large number of drainage holes 16 were provided, and their size and arrangement were determined as follows through model experiments, observation of the flow velocity distribution of the cooling water film, measurement of the heat conduction coefficient, and measurement results using a full-scale machine. It is characterized by being configured to satisfy the following conditions. That is, (1) the water supply hole 15 faces the back side of the metal belt 4#5,
The majority should be distributed as evenly as possible.

（２）上記給水孔１５の回りにそれらを中心として排水
孔１６を対称的に配置すること。(2) Drainage holes 16 are arranged symmetrically around the water supply holes 15 with these as the center.

（８）　上記給水孔の断面積Ａｉ（ｃｍ”）と排水孔の
断面積ＡＯ（ｃｎ＋”　）が次式を満足するものである
こと。(8) The cross-sectional area Ai (cm") of the water supply hole and the cross-sectional area AO (cn+") of the drainage hole satisfy the following formula.

Ａｉ７．。≧αｎ　−（ＩＪ 上記式のｎは、給水孔と排水孔の配装置に依存するパラ
メーターであり、それらの配置形が三角形のときｎ　＝
　０．５となり、四角形のときｎ＝＝１となリ、六角形
のときｎ＝２の値をとる。ｎのそれぞれの配置形を、第
４〜６図に示す。Ai7. . ≧αn − (IJ n in the above formula is a parameter that depends on the arrangement of the water supply hole and drainage hole, and when their arrangement is triangular, n =
0.5, n==1 for a square, and n=2 for a hexagon. The respective arrangement shapes of n are shown in FIGS. 4 to 6.

また、αは給水孔と排水孔の断面積の比に関する補正係
数で、α〈１だと均一な流水膜の形成が困難であり、時
として＠査中ベルトの溶損を招く場合があり、特に３０
０〜２０００声ｍ程度の均一な流水膜をベルト背面に安
定して発生させるためには、第７図に示すように該αは
１・１以上にする必要かあり、より望ましくはα≧１．
２がよい。In addition, α is a correction coefficient related to the ratio of the cross-sectional area of the water supply hole and the drainage hole. Especially 30
In order to stably generate a uniform running water film of about 0 to 2000 meters on the back surface of the belt, α needs to be 1.1 or more as shown in FIG. 7, and more preferably α≧1. ．．
2 is good.

（４）　給水孔１５の断面積Ａｉ　（Ｃｍ”　）は、そ
の値が０．５ｃｍ２よりも小さいと、カン石等の付着に
よって孔閉塞を生じやすくなる一方、その値が７Ｃ−を
超えると流水に淀みを生じてしまう。このことから次の
ような関係にあることが必要である。(4) When the cross-sectional area Ai (Cm”) of the water supply hole 15 is smaller than 0.5 cm2, the hole is likely to be clogged due to the adhesion of olivine, etc., whereas when the value exceeds 7C-, water does not flow out. Therefore, the following relationship is required.

０．５≦Ａ１≦７ （５）給水孔と排水孔との間の距離１０は、その値が大
きくなると、均一な流水膜分布を確保することが困難と
なるので、１０≦２００ｗＲにする必要があり、より望
ましくはｌ。≦１７５　ｍ：を選ぶ。0.5≦A1≦7 (5) The distance 10 between the water supply hole and the drainage hole needs to be set to 10≦200wR because if the value becomes large, it becomes difficult to ensure a uniform water film distribution. , more preferably l. ≦175 m: Select.

（７） なお、上述の説明において、冷却パッドの周辺部におい
ては対称性が失われたり一部条件を満足しない部分が生
じるが、通常この部分の金属ベルトは鋳片を直接冷却し
ないので問題はない。また、上記ｎの値を決定する孔装
置は、正確に三角形等に維持される必要はなく、熱流速
分布に大きな変化を生じさせない程度で差があっても許
容される。(7) In the above explanation, symmetry is lost or some conditions are not satisfied in the area around the cooling pad, but this is not a problem because the metal belt in this area usually does not directly cool the slab. do not have. Further, the hole arrangement that determines the value of n does not need to be maintained in an accurate triangular shape, and a difference is allowed as long as it does not cause a large change in the heat flow velocity distribution.

また、本発明は一対の固定側板を有する場合に限らず金
縞ベルトとともに同期移動する形式の側板の場合にも適
用が可能である。Furthermore, the present invention is applicable not only to the case of having a pair of fixed side plates but also to the case of a type of side plate that moves synchronously with the gold-striped belt.

実　施　例 実施例１ 使用冷却パッドは、給水孔断面積Ａｉ　＝　１．１　ｃ
ｍ”（孔径ｄｉ＝ｉ２闘）、排水孔断面積ＡＯ＝　０．
８８ｃｍ”　（孔径ｄ。＝　７　ｍ　）　、給水孔と排
水孔の孔間距離！。”１２０１１ｓ、ｙｌ　１２　（六
角形配置）ものであり、これを第１図に示すようなベル
トキャスターに設置し、厚さ１００１１１１１ＳＩｌｌ
ｌｉ１５’００闘の低炭素ｈｔキルト鋼の連続鋳造鋳片
を得た。この際のタン（８） ディツシュ温度は１５６０”Ｃであり、引抜速度は最大
８．０　ｍ／ｍｉｎで操業した。また、金属ベルトは厚
さ１．２ｍｍの薄鋼板を用いた。Examples Example 1 The cooling pad used has a water supply hole cross-sectional area Ai = 1.1 c
m” (hole diameter di=i2), drainage hole cross-sectional area AO=0.
88 cm" (hole diameter d. = 7 m), the distance between the water supply hole and the drainage hole! , thickness 10011111SIll
A continuously cast slab of low carbon HT quilt steel with a li of 15'00 was obtained. The tongue (8) dish temperature at this time was 1560''C, and the operation was carried out at a maximum drawing speed of 8.0 m/min.A thin steel plate with a thickness of 1.2 mm was used as the metal belt.

上記冷却パッドを用いて金属ベルト背面より冷却を行っ
た鋳片は、従来の第２・８図に示すような冷却パッドを
用いて冷却を行った鋳片に比べ、表面の凹凸もなく平滑
であり、圧延して得られた薄鋼板は美麗な表面であった
。また、約８０　ｔｏｎ鋳造後の金属ベルトも正常であ
り、変形やこれに起因するフィンの生成も見られなかっ
た。The slab cooled from the back side of the metal belt using the cooling pad described above has a smoother surface with no unevenness compared to the slab cooled using a conventional cooling pad as shown in Figures 2 and 8. The thin steel sheet obtained by rolling had a beautiful surface. Furthermore, the metal belt after casting approximately 80 tons was normal, and no deformation or fin formation due to this was observed.

実施例２ 使用した冷却パラＰは、Ａｉ　＝　０．７９　ｃｍ”　
（ｄｉ　＝１０１１１１）、ＡＯ＝　０．７９　ｃｍ”
（ｄ□　＝　１　０１ｍ　）、ｊ。＝１００ｗ、ｎ　＝
　０．５　（三角形配置）のものであり、実施例１とほ
ば同じ条件で鋳片を得、常法の圧延処理を経て厚さ１．
２１１１１の薄鋼板を得た。この場合も、鋳片の表面は
平滑で薄鋼板の表面性状も優れたものが得られた。Example 2 The cooling para-P used was Ai = 0.79 cm”
(di = 101111), AO = 0.79 cm”
(d□ = 1 01m), j. =100w, n=
0.5 (triangular arrangement), the slab was obtained under almost the same conditions as in Example 1, and was rolled to a thickness of 1.5 mm using a conventional rolling process.
A thin steel plate of No. 21111 was obtained. In this case as well, the surface of the slab was smooth and the surface quality of the thin steel plate was also excellent.

実施例ａ 使用した冷却パッドは、Ａｉ＝　８．１ｍ”　（ｄｉ　
＝２０、−）、Ａｏ　＝　０．７９　ｃ＋＋＋”　（ｄ
ｏ　＝　ｌＯｍｍ　）、１ｃ＝１７５＋＋ｔｍ、ｌ］＝
ｌ　（四角形配置）で、これを側面が鋳造方向に先細り
となる絞り込みタイプのベルトキャスターに設置し、厚
さ８０關、幅１０００闘のＡＪキルド鋼を連続鋳造した
。最大引抜き速度はＢ、８　Ｉｌｌ／ｍｉｎである。こ
の結果、得られたシートバーは、実施例１．Ｓと同じで
形状、表面性状とも良好なものが得られた。Example a The cooling pad used was Ai = 8.1 m” (di
= 20, -), Ao = 0.79 c+++” (d
o = lOmm), 1c = 175++tm, l] =
1 (square arrangement), this was installed on a narrow type belt caster whose side surface tapers in the casting direction, and AJ killed steel with a thickness of 80 cm and a width of 1000 mm was continuously cast. The maximum drawing speed is B, 8 Ill/min. As a result, the sheet bar obtained in Example 1. Same as S, good shape and surface quality were obtained.

比較例Ｉ Ａｉ　＝　８．１　ｃｍ”　（ｄｉ　＝　２０　闘）、
Ａｏ　＝　０．７９　ｃｍ”（ａｏ　＝　１０１１１１
１　）、ｔａ＝ｚｓｏｖｎ、ｎ＝１（四角形配置）の冷
却パッドを、絞り込みタイプのベルトキャスターにて、
厚さ８０ｓｌＮ１幅１０００ｇｍ１００Ｏ！キルド鋼を
引抜き速度４．７　ａ／ｍ：ｉｎで連続鋳造した。この
ケースは、孔間距離ｌＯのみが本発明の条ｐｆ　（ｌｏ
＝　２０　ｃｍ　）を外れて２８０鰭と大きいものの例
であるが、約５トン鋳造後、厚さ１．２闘の鋼製ベルト
の内面を観察したところ、局所的に凹凸が認められ、ベ
ルト交換を余儀なくされた。Comparative Example I Ai = 8.1 cm" (di = 20 cm),
Ao = 0.79 cm” (ao = 101111
1), ta = zsovn, n = 1 (square arrangement) cooling pad with narrow type belt casters,
Thickness 80slN1 Width 1000gm100O! Killed steel was continuously cast at a drawing speed of 4.7 a/m:in. In this case, only the hole distance lO is the inventive line pf (lo
This is an example of a large belt with 280 fins, which is outside of the 20cm diameter. When we observed the inner surface of the 1.2mm thick steel belt after casting approximately 5 tons, we found local irregularities and the belt had to be replaced. was forced to.

発　明　の　効　果 以上説明したように本発明によれば、金挑ベルトの背面
に均一で安定した冷却水流水膜を形成させることができ
るので、該金属ベルトの冷却むらが解消でき、ひいては
該ベルトの波打ち変形が解消される。その結果、該ベル
トと側面固定側板の接触が良くなり、鋳造事故が回避で
きるとともに、鋳片ならびに製品板の品質を向上させる
。Effects of the Invention As explained above, according to the present invention, it is possible to form a uniform and stable cooling water film on the back surface of the metal belt, so that uneven cooling of the metal belt can be eliminated, and as a result, the metal belt can be cooled evenly. Belt waving deformation is eliminated. As a result, the contact between the belt and the fixed side plate is improved, and casting accidents can be avoided, and the quality of the slab and product plate is improved.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は、薄肉鋳片連続鋳造機の路線図、第２図は、従
来冷却パッドを示す部分断面図、第８図は、従来冷却パ
ッドのベルト側の部分平面図、 第４〜６図は、いずれも本発明冷却パッドの給水孔、排
水孔配置の例を示す路線図、 第７図は、給水孔と排水孔の断面積比の補正係数αが鋳
片形状指数に及ぼす影暢を示すグラフである。 １・・・タンディシュ　２・・・溶鋼 （１１） ８・・・注入ノズル　４．５・・・金執ベルト６ａ〜６
１０・・・ガイドロール ７．８・・・冷却パッド　９．１０−・・ばね１１・・
・鋳片　１２・・・窪み １８・・・水膜部　１４・・・水流部 １５・・・給水孔　１６・・・排水孔。 特許出願人　川崎製鉄株式会社 同　出願人　株式会社日立製作所 代理人弁理士　杉　村　暁　秀 同　弁理士　杉　村　興　作 （１２）Fig. 1 is a route diagram of a continuous thin slab caster, Fig. 2 is a partial sectional view showing a conventional cooling pad, Fig. 8 is a partial plan view of the belt side of the conventional cooling pad, and Figs. 4 to 6. Figure 7 shows the influence of the correction coefficient α of the cross-sectional area ratio of the water supply hole and the drainage hole on the slab shape index. This is a graph showing. 1... Tundish 2... Molten steel (11) 8... Injection nozzle 4.5... Kintsuki belt 6a-6
10...Guide roll 7.8...Cooling pad 9.10-...Spring 11...
- Slab 12... Depression 18... Water film part 14... Water flow part 15... Water supply hole 16... Drain hole. Patent applicant: Kawasaki Steel Corporation Applicant: Hitachi, Ltd. Patent attorney Akira Sugimura Hidetoshi Patent attorney Kosaku Sugimura (12)

Claims (1)

【特許請求の範囲】 １　冷却パッドの介在により溶融金属および鋳片を保持
するための間隙を維持しつつ輪回移勢する鋳片長辺面側
の一対の金属ペルーと、それら金属ベルト相互間にあっ
てそれらと繁密に接している鋳片短辺面側の一対の側板
とで構成される薄肉鋳片連続＠造機の、その金属ベルト
の背面で冷却水流の導入導出を司る冷却パッドにつき、 該冷却パッドの上記金属ベルトに面して開口させた冷却
水流の給水孔、排水孔の各断面積ならびにそれらの配置
を下記式に示すように構成してなる薄肉鋳片連続鋳造機
の冷却パッド。 記 ０．６≦Ａ１≦７ Ａｉ　／　ＡＯ≧１．１　ｎ ！。≦２０ 式中、Ａ１：給水孔の断面積（Ｃ−） ＡＯ＋排水孔の断面積（Ｃ，”） ！。：給・排水孔中心間の距離（Ｃ） ｎ：給水孔、排水孔の配置に依存す るパラメータで、三角形配置で ０．５、四角形配置で１、六角形 配置で２を示す値[Scope of Claims] 1. A pair of metal belts on the long side surfaces of the slab which are rotated while maintaining a gap for holding the molten metal and the slab through the intervention of a cooling pad, and a pair of metal belts on the long sides of the slab that are located between the metal belts. Regarding the cooling pad that controls the introduction and extraction of the cooling water flow on the back side of the metal belt of the thin-wall continuous cast slab forming machine, which is composed of a pair of side plates on the short side of the slab that are in close contact with A cooling pad for a continuous thin slab casting machine, wherein the cross-sectional area of a water supply hole and a drainage hole for a cooling water flow, which are opened facing the metal belt, and their arrangement are configured as shown in the following formula. Note 0.6≦A1≦7 Ai / AO≧1.1 n! . ≦20 In the formula, A1: Cross-sectional area of the water supply hole (C-) AO + Cross-sectional area of the drainage hole (C,'') !.: Distance between the centers of the supply and drainage holes (C) n: Arrangement of the water supply hole and drainage hole A parameter that depends on , and has a value of 0.5 for a triangular layout, 1 for a quadrangular layout, and 2 for a hexagonal layout.