JPS6152964A - Mold for continuous casting - Google Patents

Abstract

PURPOSE:To suppress the generation of a recess on a billet surface owing to the small explosion of a lubricating oil and to improve the quality of the billet by opening and disposing plural fine lubricating oil supply holes to a mold copper plate for casting right under the molten metal surface and providing discharge holes for conducting the space of solidified shells to the atm. so as to disperse around the fine holes. CONSTITUTION:An oil supply source 2 feeds the oil through a supply piping 5 to the vertical holes 6 and horizontal holes 7 of the mold copper plate 3 and supplies further the oil to the space from the solidified shells 1b through the fine holes 8. The oil is confined into the holes 8 and the small explosion is induced according to the inflow conditon of the molten steel or the way of making air gaps. The explosion gas in such a case is discharged through one stage of fine discharge holes 11 to the outside from the aperture at the end of a horizontal discharge hole 10 or the aperture at the end of a vertical discharge hole 9.

Description

【発明の詳細な説明】 （産業上の利用分野） 鋼の連続鋳造用鋳型に関してこの明細書で述べる技術内
容は、該鋳型銅板と鋳片間の潤滑を適切に行い、鋳片表
面のオシレーションマークの軽微化ないしは解消に役立
てることについての開発成果を提案するところにある。Detailed Description of the Invention (Industrial Application Field) The technical content described in this specification regarding a mold for continuous casting of steel is to appropriately lubricate between the copper plate of the mold and the slab, and to prevent oscillation on the surface of the slab. The aim is to propose development results that can be used to minimize or eliminate marks.

（従来の輯術ン 鋼の連続鋳造用鋳型における鋳型銅板と鋳片との間の潤
滑は、通常、鋳型内の溶鋼面（メニスカス）上にパウダ
ーまたはレブシードオイルなどの潤滑剤を供給し、かつ
鋳型にオシレーション運動を与えることによってなされ
、このオシレーションの振動数は通常１００　Ｃｐｍ前
後であるが、オシレーションマークを軽減しようとして
、最近３００〜４００　Ｃｐｍまでのようなハイサイク
ル化が試みられている。(In conventional continuous casting molds for engineering steel, lubrication between the mold copper plate and the slab is usually achieved by supplying a lubricant such as powder or Revseed oil onto the molten steel surface (meniscus) in the mold. This is done by applying oscillation motion to the mold, and the frequency of this oscillation is usually around 100 Cpm, but recently attempts have been made to increase the frequency to 300 to 400 Cpm in an attempt to reduce oscillation marks. ing.

しかし、ハイサイクル化すると潤滑剤のシェル間隙への
流れ込みが少なくなって潤滑不良で焼句を起こし、さら
にはブレークアウトなどを引き起こすうれいがあった。However, when the cycle is increased, the flow of lubricant into the gap between the shells decreases, resulting in poor lubrication, which can lead to burnouts and even breakouts.

この対策として特願昭５９　　　　゛−７５７２８号明
細書にて鋳型銅板の表面に細孔をあけ、この細孔を通し
てレプシードオイルなどのｉ関滑剤を供給して潤滑する
方法をさきに提案した。この方法は、潤滑こそ確実にな
るがその後の実験によると、とくに潤滑剤としてレブシ
ードオイルを使う場合、ときとして供給したオイルが鋳
型内の溶鋼によって細孔内に閉じ込められ、密封される
ような状態のもとに局所的にオイルの小爆発が１６き、
そのため鋳片表面に局部凹みが生じる。As a countermeasure to this problem, Japanese Patent Application No. 1975-75728 proposed a method for lubricating the molded copper plate by making pores in its surface and supplying an i-type lubricant such as Lepseed oil through the pores. Although this method ensures lubrication, subsequent experiments have shown that, especially when Revseed oil is used as a lubricant, the supplied oil is sometimes trapped in the pores and sealed by the molten steel in the mold. Under the condition, there were 16 small explosions of oil locally,
Therefore, local depressions occur on the surface of the slab.

この小爆発は、オイルの供給量、供給位置および鋳造条
件によって異なり、条件を適正に選べばある程度防止す
ることは可能ではあるが、溶鋼によるオイルの封じ込め
現象は元来不安定現象であり、潤滑条件、ｉ！８造条件
だけの調整だけでは十分制御しきれない。また、小爆発
による鋳片表面の凹みは鋳片の割れや、さらにはブレ゛
−クアウトの原因にもなつ、また鋳片品質上も好ましく
ない。This small explosion varies depending on the amount of oil supplied, the supply position, and casting conditions, and although it is possible to prevent it to some extent by choosing the conditions appropriately, the phenomenon of oil confinement by molten steel is inherently unstable, and the lubrication Conditions, i! It is not possible to achieve sufficient control by adjusting only the 8-building conditions. Furthermore, dents on the surface of the slab due to small explosions can cause cracks in the slab or even breakouts, and are also unfavorable in terms of quality of the slab.

（発明が解決しようとする問題点ン そこでこの発明は、上記オイルの小爆発の如きによる鋳
片表面の有害な凹みの発生を有効に抑制し、しかもハイ
サイクルオシレーションでの安定した、潤滑を可能とし
、もって円滑な連続鋳造作業の遂行を確保しようとする
ものである。(Problems to be Solved by the Invention) Therefore, the present invention effectively suppresses the formation of harmful dents on the slab surface due to the above-mentioned small explosion of oil, and also provides stable lubrication during high cycle oscillation. The purpose is to make continuous casting possible and thereby ensure smooth execution of continuous casting operations.

（問題点を解決するための手段） この発明は、連続＠造用鋳型の鋳型銅板に、湯面直下で
υ１」口する複数の潤滑油供給用細孔を配設すると共に
、該細孔の周辺に分散位置してシェル間隙を大気と導通
する排気孔を具備させて成ることを特徴とする連続鋳造
用鋳型である。(Means for Solving the Problems) This invention provides a plurality of pores for supplying lubricating oil with openings of υ1" just below the molten metal surface in a copper plate of a continuous casting mold, and This continuous casting mold is characterized by having exhaust holes distributed around the periphery to communicate the shell gap with the atmosphere.

このようにして鋳型銅板の細孔より潤滑剤を直接鋳片と
の間に供給し、適切な潤滑を実現するとともに潤滑剤の
小爆発による鋳片表面性状への影響を防止して、それに
起因するＵ１片表面の局部凹みの発生を有利に抑制する
。In this way, the lubricant is directly supplied between the pores of the mold copper plate and the slab, achieving appropriate lubrication and preventing small explosions of the lubricant from affecting the surface properties of the slab. This advantageously suppresses the occurrence of local dents on the surface of the U1 piece.

ここに用いる潤滑剤としてはレプシードオイル（以下単
にオイルというンパウダーなどがあるが爆発性からする
とオイルの方がより爆発しゃすい。The lubricant used here includes lepseed oil (hereinafter simply referred to as oil) and powder, but in terms of explosiveness, oil is more likely to explode.

もちろんパウダーすなわち粉体潤滑剤でも溶融して反応
によりガスを生成すると体積膨張を生じるが、その量は
少ないので通常はほとんど問題にならず爆発防止の観点
からは粉体錆滑剤を有利とするものの、粉体を細孔より
長時間安定して送ることが目づまりなどの面で難しく、
実用的にはオイル潤滑が簡便で、ここにオイルを潤滑剤
として用いるときの上掲の問題を克服することを安する
わけである口 さて第１図にこの発明による連続鋳造鋳型の縦断面を、
Ａ−Ａ　、Ｂ−Ｂ　、０−０およびＤ−Ｄ各　、断面に
あわせ示し１図中１は鋳片、２はオイル供給源、８は鋳
型銅板、そして４は冷却箱、５はオイル供給配管、６は
縦孔、７見横孔、８は細孔、そして９は排気縦孔、１０
は同横孔、１１が排気孔である。Of course, powder (powder lubricant) also undergoes volumetric expansion when it melts and generates gas through reaction, but since the amount is small, it usually poses no problem, and powder rust lubricants are advantageous from the perspective of explosion prevention. , it is difficult to send powder stably through the pores for a long time due to clogging, etc.
Practically speaking, oil lubrication is convenient and it is easy to overcome the above-mentioned problems when using oil as a lubricant. Figure 1 shows a vertical cross-section of a continuous casting mold according to the present invention. ,
A-A, B-B, 0-0, and D-D are shown according to the cross section. In the figure, 1 is the slab, 2 is the oil supply source, 8 is the mold copper plate, 4 is the cooling box, and 5 is the oil supply. Piping, 6 is a vertical hole, 7 is a horizontal hole, 8 is a small hole, and 9 is an exhaust vertical hole, 10
11 is the horizontal hole, and 11 is the exhaust hole.

（作用） オイル供給源２は泊ポンプ（図示せず）などとし、オイ
ル供給配管５を介して・鋳型鋼板３に予め設えた縦孔６
および横孔７に送ワ込み、鋳片１と連なる未凝固溶鋼１
ａの湯面直下に開口させた複数の細孔より鋳片シェル１
ｂとのすき間（エアーギャップ）に供給する。このとき
湯面からの溶鋼のエアーギャップへの流入状況やエアー
ギャップのでき方によっては細孔８内にオイルを封じ込
めこれが不時に小爆発を生じる原因となる。(Function) The oil supply source 2 is a pump (not shown) or the like, and the oil is supplied through an oil supply pipe 5 to a vertical hole 6 provided in advance in the molded steel plate 3.
Unsolidified molten steel 1 is fed into the horizontal hole 7 and connected to the slab 1.
The slab shell 1 is formed through multiple pores opened just below the hot water surface of a.
Supplied into the air gap with b. At this time, depending on the flow of molten steel from the molten metal surface into the air gap and the way the air gap is formed, oil may be trapped in the pores 8 and cause a small explosion to occur inadvertently.

オイルの分子量は数百のオーダーで水と比べると８０〜
４０倍あり、比重も０．９弱で水より小さいことから爆
発力も水のｌ／４ｏ程度となり、したがって爆発も局所
的で小さいため、爆風の抜は道も小さなもので対処でき
る。The molecular weight of oil is on the order of several hundred, and compared to water it is 80~
It is 40 times heavier and has a specific gravity of just under 0.9, which is smaller than water, so the explosive force is about 1/4o of water, and therefore the explosion is local and small, so the blast can be overcome with a small path.

すなわちこの発明では上記の細孔８の周辺に爆風の抜は
道として役立つ排気細孔１１を分散配置する。That is, in the present invention, exhaust pores 11 are distributed around the pores 8, which serve as vents for blast air.

この排気細孔１１は、細孔８の周辺に多数配置するのが
望ましいが加工上の便宜を考え図示のように排気横孔１
０に集約させ、１段分の排気細孔１１からの爆発ガスを
まとめて排気横孔１０の端部開口、もしくは排気縦孔９
の端部開口より外部に排出させるわけである。It is desirable to arrange a large number of these exhaust holes 11 around the pores 8, but for convenience in processing, the exhaust side holes 11 are arranged as shown in the figure.
0, and the explosive gas from one stage's worth of exhaust holes 11 is collected into the end opening of the horizontal exhaust hole 10 or the vertical exhaust hole 9.
The liquid is discharged to the outside through the opening at the end.

排気細孔１１の孔径は排気上は大きい方が良いが、あま
り大きくすると溶ｆｉｌｉ１１ａが差し込んで目づまり
を起こすので、通常はＩＭ程度におさえる必要がある。It is better for the diameter of the exhaust pores 11 to be large for the purpose of exhaustion, but if the diameter is too large, the molten fili 11a will insert and cause clogging, so it is usually necessary to keep the diameter to about IM.

図示の例では、給油用の細孔８の１段分に対して排気細
孔１１も１段だけ設けているが排気不足の場合は、給油
用の細孔８の１段に対し、排気細孔１１を２段、８段に
増設してももちろん力）まわない。In the illustrated example, only one stage of exhaust holes 11 is provided for one stage of the oil supply holes 8, but in case of insufficient exhaust, the exhaust hole 11 is provided for one stage of the oil supply holes 8. Of course, even if the holes 11 are expanded to 2 or 8 stages, the force will not change.

また、上記のように排気細孔１１の径が大きくとれない
ことに対しては第１図Ａ−Ａ断面図に示すように給油用
の細孔８のピッチに対し、排気用細孔１１のピッチをよ
り密にして排気通路の断面積を硲保し、排気孔の段数を
少なくすることもできる。In addition, since the diameter of the exhaust pores 11 cannot be made large as described above, the pitch of the exhaust pores 11 is smaller than the pitch of the oil supply pores 8, as shown in the sectional view taken along the line A-A in FIG. It is also possible to make the pitch denser to maintain the cross-sectional area of the exhaust passage and reduce the number of stages of exhaust holes.

必要な排気孔の面積は、潤滑剤の種類、鋳型サイズ、鋳
造条件によって異なるが、通常のオイル潤滑の場合で給
油用細孔８の総断面積のＰｌぼ８〜ｌＯ倍程度にとれば
小爆発によ、る鋳片表面の有害な凹みは防止できる。The required area of the exhaust hole varies depending on the type of lubricant, mold size, and casting conditions, but in the case of normal oil lubrication, it is small if it is approximately 8 to 10 times the total cross-sectional area of the oil supply pores 8. Harmful dents on the slab surface caused by explosions can be prevented.

なお、第２図には従来の排気手段を欠く給油子′段を構
じた連続鋳造鋳型の第１図に対応する断面をあられし、
対応する照応記号は第１図と同様である。なお、各図に
おいて１２は配管５の固定継手、１３は盲栓、１４は鋳
型鋼板１の背面に形成した冷却スロット、１５は鋳型銅
板の取付はボルト孔、１６は冷却水である。In addition, FIG. 2 shows a cross section corresponding to FIG. 1 of a continuous casting mold equipped with an oil feeder stage that lacks conventional exhaust means.
The corresponding anaphors are the same as in FIG. In each figure, 12 is a fixed joint for the pipe 5, 13 is a blind plug, 14 is a cooling slot formed on the back surface of the molded steel plate 1, 15 is a bolt hole for mounting the molded copper plate, and 16 is a cooling water.

以上この発明につきハイサイクルオシレーション鋳造時
における潤滑方法についての適用に関し説明をしたが、
オシレーション併用は必ずしも必須ではなく、条件が整
えばもちろんオシレーション無しの鋳造にも応用の可能
性がある。The application of this invention to the lubrication method during high cycle oscillation casting has been explained above.
It is not always necessary to use oscillation in combination, and if the conditions are right, it may of course be applied to casting without oscillation.

（発明の効果ン （１）　　ハイサイクルオシレーション鋳造においても
十分な鋳片潤滑が可能であり、潤滑剤の小爆発等による
有害な鋳片表面の凹みを発生させることなくオシレーシ
ョンマーク７の軽微な平滑できれいな表面の鋳片の鋳造
が可能になる。(Effects of the invention (1) Sufficient slab lubrication is possible even in high-cycle oscillation casting, and slight oscillation mark 7 can be achieved without causing harmful dents on the slab surface due to small explosions of lubricant, etc. This makes it possible to cast slabs with smooth and clean surfaces.

（２）　　本発明は従来タイプの銅板に対し追加工する
だけで適用可能であり既設連鋳機へも低コストで適用で
きる。(2) The present invention can be applied to conventional type copper plates by simply performing additional processing, and can also be applied to existing continuous casting machines at low cost.

（３）潤滑剤の使用はオイル、パウダーのいずれも可能
で適用範囲も広い。(3) The lubricant can be either oil or powder, and has a wide range of applications.

（４）鋳造条件、潤滑条件によっては、オシレーション
なしの鋳造も可能である。(4) Depending on the casting conditions and lubrication conditions, casting without oscillation is also possible.

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

第１図は、この発明に従う連続鋳造用鋳型の断面図、 第２図は、従来鋳型の断面図である。 １・・・鋳片　　　　　　　　１ａ１１．溶鋼１ｂ・・
・′凝固シェル　　　　８・・・鋳型鋼板　　　　　　
　　ｂ８・・・潤滑剤供給用の細孔 １１・・・排気細孔FIG. 1 is a sectional view of a continuous casting mold according to the present invention, and FIG. 2 is a sectional view of a conventional mold. 1... Slab 1a11. Molten steel 1b...
・'Solidified shell 8...Mold steel plate
b8...Lubricant supply pore 11...Exhaust pore

Claims (1)

【特許請求の範囲】[Claims] １、連続鋳造用鋳型の鋳型銅板に、湯面直下で開口する
複数の潤滑油供給用細孔を配設すると共に、該細孔の周
辺に分散位置してシェル間隙を大気と導通する排気孔を
具備させて成ることを特徴とする連続鋳造用鋳型。1. A plurality of pores for lubricating oil supply that open just below the molten metal surface are arranged in the mold copper plate of the continuous casting mold, and exhaust holes are distributed around the pores to communicate the shell gap with the atmosphere. A continuous casting mold characterized by comprising: