JPH02217138A - Mold for continuous casting and controlling method thereof - Google Patents
Mold for continuous casting and controlling method thereofInfo
- Publication number
- JPH02217138A JPH02217138A JP3664389A JP3664389A JPH02217138A JP H02217138 A JPH02217138 A JP H02217138A JP 3664389 A JP3664389 A JP 3664389A JP 3664389 A JP3664389 A JP 3664389A JP H02217138 A JPH02217138 A JP H02217138A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- cooling water
- cooling
- water
- wall
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000009749 continuous casting Methods 0.000 title claims description 14
- 239000000498 cooling water Substances 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000005266 casting Methods 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 241000270708 Testudinidae Species 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract 1
- 238000012546 transfer Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 230000005499 meniscus Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 235000019484 Rapeseed oil Nutrition 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は連続鋳造用鋳型およびその鋳型の制御方法に関
し、詳しくは鋳型の下部構造に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a continuous casting mold and a method of controlling the mold, and more particularly to a lower structure of the mold.
（従来の技術及びその課題）
連続鋳造用鋳型は通常６００〜１２００ｍｍの長さを有
するもので鋳型内壁は高い熱伝導率を有する材料、すな
わち銅または銅合金等により構成されている。(Prior art and its problems) A continuous casting mold usually has a length of 600 to 1200 mm, and the inner wall of the mold is made of a material having high thermal conductivity, such as copper or a copper alloy.
このような鋳型を用いて鋳造を行う場合、溶鋼は鋳型壁
内部に供給される冷却媒体（例えば水）により間接的に
冷却作用を受け、鋳型壁に接する部分から漸次凝固が進
行し、凝固シェルの厚さが内部溶鋼の流体静力学的圧力
に耐え得る程度まで成長するに伴い凝固シェルは収縮し
、鋳型壁と凝固シェルの間に空隙を生じる事になる。When casting is performed using such a mold, the molten steel is indirectly cooled by a cooling medium (e.g. water) supplied inside the mold wall, and solidification progresses gradually from the part in contact with the mold wall, forming a solidified shell. As the thickness of the solidified shell grows to the extent that it can withstand the hydrostatic pressure of the internal molten steel, the solidified shell contracts, creating a void between the mold wall and the solidified shell.
特に矩形断面を有する鋳型においては、鋳型の広面壁中
央部と接する鋳片凝固シェルは内部の溶調圧力により外
側に膨出し易く鋳型壁面と比較的よく接触し易いが、鋳
型広面側端部および挟置側の下部においては空隙が顕著
に現れ易い傾向がある。Particularly in a mold with a rectangular cross section, the solidified slab shell in contact with the center of the wide wall of the mold tends to bulge outward due to the internal melting pressure and comes into relatively good contact with the mold wall, but at the wide end of the mold and There is a tendency for voids to appear conspicuously in the lower part on the sandwiching side.
この空隙発生は鋳片から鋳型壁への熱伝導効率を著しく
低下させ、鋳片の凝固シェル成長を大きく阻害し、凝固
シェル厚さの不均一による表面縦割れ等品質欠陥の誘因
となり、さらには凝固シェル破損によるブレークアウト
の大きな要因となる場合が多い。これは現状連続鋳造設
備の大きな基本的問題点となっており、特に高速鋳造化
指向への最大の障害になっている。This generation of voids significantly reduces the efficiency of heat transfer from the slab to the mold wall, greatly inhibits the growth of the solidified shell of the slab, and causes quality defects such as surface vertical cracks due to uneven thickness of the solidified shell. This is often a major cause of breakout due to damage to the solidified shell. This is a major fundamental problem with the current continuous casting equipment, and is the biggest obstacle to achieving high-speed casting.
この鋳型壁と凝固シェルの空隙発生を防止する鋳型（装
置）および方法として、■鋳型内における鋳片の平均凝
固収縮率に相当する量だけ鋳型内壁面（平面）を経験的
に内側に傾斜させて固定的に堅持する鋳型および方法、
■鋳型内壁に、鋳造方向に連続する少なくとも２つのテ
ーパー段を付与する、いわゆるマルチテーパー鋳型およ
び方法（特開昭５３−１２５９３２号公報）等が提案さ
れている。しかしこのような鋳型壁の直線的１段または
２段以上、かつ固定的に堅持された傾斜（テーパー）付
与のみでは鋳造速度、温度、網種等様々の要因により変
動する複雑なａ固数縮量に順応して凝固シェルと鋳型内
壁面とを適当な接触面圧を保ちなから当接させることは
極めて困難で、鋳型壁面下部で空隙を佳したり、逆に凝
固シェルとの断続的接触による鋳型壁の甚だしい摩耗を
生起しやすく、メツキ層の剥離の問題も多い。また、■
相対する２対の鋳型壁のうちの何れか一方もしくは両方
の鋳型壁を上下方向に２段以上分割形成するとともに、
最上段壁を除く下段壁をそれぞれ移動装置に連結し、鋳
型内方を指向して移動自在に設けた鋳型（特開昭５６−
９５４５１号公報）も提案されている。この鋳型は鋳片
との間に適当な面圧を有する下部内壁板が鋳片の収縮量
に順応して前後方向に摺動する事によって鋳片との間の
空隙発生を減少し、さらに鋳片との異常接触による下部
内壁板表面の異常摩耗を防止するように工夫したもので
ある。しかし通常どおり鋳型自溶鋼表面に潤滑剤として
モールドパウダー（ＣａＯ−５ｉＯ□ＣａＦｚ−Ｎａｚ
Ｏを主成分とする基材粉と炭素粉の混合物）を添加する
場合、下段鋳型壁と鋳片との隙間に自然にうまく流入さ
れないため、下段鋳型の冷却効果の向上また同時に潤滑
効果の向上も小さい。As a mold (equipment) and method for preventing the generation of voids between the mold wall and the solidified shell, we have empirically shown that the inner wall surface (plane) of the mold is inclined inward by an amount corresponding to the average solidification shrinkage rate of the slab in the mold. a mold and method for holding it firmly;
(2) A so-called multi-taper mold and method (Japanese Unexamined Patent Publication No. 125932/1983) have been proposed in which the inner wall of the mold is provided with at least two tapered steps that are continuous in the casting direction. However, with only one or more straight steps of the mold wall and a fixedly maintained slope (taper), a complicated a-hardness reduction that varies depending on various factors such as casting speed, temperature, mesh type, etc. It is extremely difficult to bring the solidified shell into contact with the inner wall of the mold without maintaining an appropriate contact surface pressure depending on the amount of the solidified shell. This tends to cause severe wear on the mold wall, and there are many problems with peeling of the plating layer. Also,■
Either or both of the two pairs of opposing mold walls are divided into two or more stages in the vertical direction, and
A mold in which the lower walls except the uppermost wall are connected to a moving device so as to be movable inwardly of the mold
95451) has also been proposed. In this mold, the lower inner wall plate, which has an appropriate surface pressure between the slab and the slab, slides back and forth in accordance with the amount of contraction of the slab, thereby reducing the generation of gaps between the slab and the slab. This is designed to prevent abnormal wear on the surface of the lower inner wall plate due to abnormal contact with the pieces. However, as usual, mold powder (CaO-5iO□CaFz-Naz
When adding a mixture of O-based base material powder and carbon powder, it does not naturally flow into the gap between the lower mold wall and the slab, improving the cooling effect of the lower mold and improving the lubrication effect at the same time. It's also small.
したがって下部鋳型壁の摩耗もあまり改善されない。Therefore, the wear of the lower mold wall is not significantly improved.
一方、この鋳型壁と凝固シェルの空隙に伝熱媒体を充填
し、空隙部分の冷却を強化する方法として、■伝熱媒体
として黒鉛、塩化カリウム、塩化カルシウム、塩化ナト
リウム、はう酸等をパウダー状あるいはそれらに菜種油
などを加えてペースト状にして空隙に供給する方法（特
開昭５５−９２２５６号公報）、さらに前記黒鉛微粒子
の混合液を粘度、熱伝導度の観点から改良を加えた、■
植物油（菜種油など）に１０００メツシユ以下の黒鉛微
粒子を１５〜２５体積％添加した混合液を空隙に供給す
る方法（特開昭５７−１５４３５１号公報）も別途提案
されている。しかし、これらの伝熱媒体供給法は、流動
性が悪いため刻々形状が変化する空隙の細部まで行きわ
たらず、十分な伝熱媒体効果が上がらないという問題が
ある。On the other hand, as a method of filling the void between the mold wall and the solidified shell with a heat transfer medium to strengthen the cooling of the void, the method is as follows: ■ Powder of graphite, potassium chloride, calcium chloride, sodium chloride, ferrous acid, etc. or by adding rapeseed oil or the like to the paste and supplying it to the voids (Japanese Unexamined Patent Publication No. 55-92256), and further improving the mixed liquid of graphite particles from the viewpoint of viscosity and thermal conductivity. ■
A method (Japanese Unexamined Patent Publication No. 154351/1982) has also been proposed in which a mixture of vegetable oil (rapeseed oil, etc.) to which 15 to 25% by volume of graphite particles of 1000 mesh or less is added is supplied to the voids. However, these methods of supplying a heat transfer medium have a problem in that, due to poor fluidity, the heat transfer medium cannot reach the fine details of the gaps whose shape changes every moment, and therefore a sufficient heat transfer medium effect cannot be achieved.
本発明は前述の諸点に鑑みてなされたものである。すな
わち本発明は、鋳型広面側端部および挟置側下部に形成
される空隙による鋳型冷却能の低下を防止し、凝固シェ
ル形成を増進、均一化し、または潤滑の改善により鋳型
壁の甚だしい摩耗防止を目的とするものである。The present invention has been made in view of the above-mentioned points. That is, the present invention prevents a decrease in mold cooling ability due to the voids formed at the wide end of the mold and the lower part of the clamping side, promotes and uniformizes the formation of a solidified shell, and prevents severe wear on the mold wall by improving lubrication. The purpose is to
（課題を解決するための手段）
上記目的を達成するために本発明に係る連続鋳造鋳型は
、矩形断面を有する連続鋳造組立鋳型において、相対す
る２対の鋳型壁のうちの何れか一方もしくは両方の鋳型
壁を鋳片鋳込方向に２段以上に分割形成すると共に、最
上流側鋳型壁を除く下流側鋳型壁を複数の冷却水ガイド
板で鋳片輻方向に分割構成し、対を成す下流側鋳型壁を
構成する前記夫々の冷却ガイド板を互いに接離移動可能
に構成している。(Means for Solving the Problems) In order to achieve the above object, a continuous casting mold according to the present invention provides a continuous casting mold having a rectangular cross section, in which one or both of two pairs of opposing mold walls are used. The mold wall is divided into two or more stages in the slab casting direction, and the downstream mold wall except the most upstream mold wall is divided in the slab radial direction with a plurality of cooling water guide plates, forming a pair. The respective cooling guide plates constituting the downstream mold wall are configured to be movable toward and away from each other.
またかかる構成の連続鋳造用鋳型の構成要素である対を
成す冷却水ガイド板の夫々相対する面に給水口列と排水
口列を交互に設けてこれら給水系及び排水系の圧力を検
出し、この検出値に基づいて鋳片と下流側鋳型壁間に形
成されろ水膜厚さ、冷却水流速を鋳片幅方向において均
一と成すべ（前記対を成す夫々の冷却水ガイド板の接離
移動制御を行うこととしている。Further, water supply port rows and drain port rows are provided alternately on opposing surfaces of the pair of cooling water guide plates, which are the constituent elements of the continuous casting mold having such a configuration, and the pressures of these water supply and drainage systems are detected, Based on this detected value, the thickness of the filter film formed between the slab and the downstream mold wall and the flow velocity of the cooling water are made uniform in the width direction of the slab. Movement control will be performed.
本発明鋳型において、複数の冷却水ガイド板を用いて下
流側鋳型を鋳片幅方向に分割構成したのは、■凝固シェ
ルが広幅面中央のみ膨らんでいるため、分割構成するこ
とによって中央部と、端部の隙間を一定にするため、■
広幅の冷却水ガイド板を使用した場合、熱変形による歪
が大きく、隙間の一様化が不可能なため、である。In the mold of the present invention, the reason why the downstream mold is divided in the slab width direction using a plurality of cooling water guide plates is because the solidified shell bulges only in the center of the wide side. , In order to keep the gap at the end constant, ■
This is because when a wide cooling water guide plate is used, distortion due to thermal deformation is large and it is impossible to make the gap uniform.
本発明における鋳型の制御方法において、鋳片幅方向に
おいて均一と成す鋳片と下流側鋳型壁間に形成されろ水
膜厚さ、冷却水流速値は何等限定されるものではないが
、本発明者らの研究・実験によれば水膜厚さは０．２〜
３．０ｍｍ、冷却水の流速は６〜４０ｍ／Ｓの範囲に設
定すれば、下流側鋳型に高速水膜による強冷却と強制潤
滑の２つの機能を持たせることができる。In the mold control method of the present invention, the thickness of the filter film formed between the slab and the downstream mold wall, which is uniform in the slab width direction, and the cooling water flow rate are not limited in any way, but the present invention According to their research and experiments, the water film thickness is 0.2~
3.0 mm, and the flow rate of the cooling water is set in the range of 6 to 40 m/s, the downstream mold can have two functions: strong cooling by a high-speed water film and forced lubrication.
（作 用）
上記した構成の本発明によれば、下流側鋳型を構成する
冷却ガイド板を夫々移動可能にしたため、鋳片と鋳型壁
間の間隔を鋳片幅方向に均一となるように制御できる。(Function) According to the present invention configured as described above, since the cooling guide plates constituting the downstream mold are made movable, the distance between the slab and the mold wall can be controlled to be uniform in the width direction of the slab. can.
（実 施 例）
以下本発明を添付図面に基づいて更に具体的に説明する
。(Example) The present invention will be described in more detail below based on the accompanying drawings.
第１図は本発明の一実施例を示したものであり、連続鋳
造用鋳型を上流側鋳型１と下流側鋳型２の二分割にした
場合の組込み構造を示す。ところで、上流側鋳型１は通
常、テーパーを付与された鋳型壁、または相対する２対
の平行鋳型壁を有する。FIG. 1 shows an embodiment of the present invention, and shows an assembly structure in which a continuous casting mold is divided into two parts, an upstream mold 1 and a downstream mold 2. By the way, the upstream mold 1 usually has a tapered mold wall or two pairs of opposing parallel mold walls.
一方、下流側鋳型２は例えば第二図（イ）に示す短冊状
または同図（ロ）に示す亀甲状に類する形状の複数の冷
却水ガイド板３より構成され、それぞれ例えばシリンダ
４等の移動装置にリンク８を介して連結され、対を成す
鋳型壁面が接離移動できるように成されている。なお、
第１図中９はスプリングを示す。On the other hand, the downstream mold 2 is composed of a plurality of cooling water guide plates 3 each having a rectangular shape as shown in FIG. 2 (A) or a tortoise shell shape as shown in FIG. It is connected to the device via a link 8 so that the paired mold wall surfaces can move toward and away from each other. In addition,
9 in FIG. 1 indicates a spring.
第２図は下流側鋳型２壁を構成する冷却水ガイド板３の
概略を示すものであり、当該冷却水ガイド板３には給水
口５列と排水口６列を交互に設け、当該給水部と排水部
とに設けられた圧力検知器７により圧力を検出し、この
検出値に応じてシリンダ４により各冷却水ガイド板３を
移動できるようにしている。FIG. 2 schematically shows the cooling water guide plate 3 that constitutes the wall of the downstream mold 2, and the cooling water guide plate 3 is provided with five rows of water supply ports and six rows of drainage ports alternately. The pressure is detected by pressure detectors 7 provided in the and drainage parts, and each cooling water guide plate 3 can be moved by the cylinder 4 according to the detected value.
なお、上流側鋳型１方向への冷却水の吹き上げを防止す
るため、冷却水ガイド板３の最上段の列は排水口とした
方が望ましい。In addition, in order to prevent the cooling water from blowing up in the direction of the upstream mold 1, it is preferable that the uppermost row of the cooling water guide plate 3 be used as a drain port.
また給水口５および排水口６の少なくともどちらか一方
を第２図（イ）に示すようにスリット状長孔とすること
によって、鋳片１０と冷却水ガイド板３間に形成された
水膜内の冷却水の均一な流れを実現できる。In addition, by making at least one of the water supply port 5 and the drain port 6 into a slit-like elongated hole as shown in FIG. A uniform flow of cooling water can be achieved.
ところで第３図は、通常の鋳型の場合の鋳型冷却水と鋳
片表面間の総括熱伝達係数の鋳造方向分布を測定し、図
示したものである。この分布がら人体において鋳型メニ
スカスから約１００〜３００ ｔｗｎ以上下方において
空隙が発止し易く、最上流側鋳型の長さは、メニスカス
下１００〜３００ ｍｍの長さを持たせることが有効で
あること、また鋳片凝固シェル厚さの増加には平均総括
熱伝達係数がｉｏｏ。By the way, FIG. 3 shows the measured distribution of the overall heat transfer coefficient in the casting direction between the mold cooling water and the surface of the slab in the case of a normal mold. Due to this distribution, voids are likely to form approximately 100 to 300 twn or more below the mold meniscus in the human body, and it is effective to make the length of the most upstream mold 100 to 300 mm below the meniscus. , and the average overall heat transfer coefficient is ioo for the increase in slab solidification shell thickness.
ｋｃａｌ／ｍ２・ｈｒ・°Ｃ以上の下流側鋳型冷却能力
が必要であることが判る。これを改善するために通常鋳
型の冷却水増大、また冷却水圧力の上昇等積々の試みが
なされてきたが、前記空隙の生成により限度がある。そ
こで本発明者らは高速水膜の利用を思いつき、鋭意研究
を重ねた結果、鋳型を上記した如く構成し、かつ鋳型壁
と鋳片間に形成される水膜厚さを０．２〜３．０＋ｎｌ
１１、冷却水の平均流速Ｖを６〜４０ｍ／Ｓの範囲に設
定すれば、水膜の厚さの変動を防止して鋳型幅方向の厚
み精度を確保し、強冷却化、強制潤滑がより効果的に行
えることを見出した。以下この水膜条件につき詳細に説
明する。It can be seen that a downstream mold cooling capacity of kcal/m2·hr·°C or more is required. In order to improve this problem, many attempts have been made to increase the amount of cooling water in the mold or to increase the pressure of the cooling water, but there are limits due to the formation of the voids. Therefore, the present inventors came up with the idea of using a high-speed water film, and as a result of intensive research, they constructed a mold as described above, and the thickness of the water film formed between the mold wall and the slab was 0.2 to 3. .0+nl
11. By setting the average flow velocity V of the cooling water in the range of 6 to 40 m/s, fluctuations in the thickness of the water film can be prevented, thickness accuracy in the mold width direction can be ensured, and stronger cooling and forced lubrication can be achieved. I found out that it can be done effectively. This water film condition will be explained in detail below.
第２図（イ）に示す冷却水ガイドＦｉ３の給水口５から
流出した冷却水の平均流速■を８ ｍ ／ Ｓに制御し
て、鋳造中の平均水膜ＩｔさＴと、その変動幅Δδ５を
測定した結果を第４図に示す。同図からも判るように、
鋳造中の平均水膜厚さＴが３．０ｍｍ以上および０．２
ｍｍ以下になると水膜の変動幅Δδが増加する。By controlling the average flow velocity of the cooling water flowing out from the water supply port 5 of the cooling water guide Fi3 shown in FIG. The measurement results are shown in Figure 4. As can be seen from the same figure,
The average water film thickness T during casting is 3.0 mm or more and 0.2
When it becomes less than mm, the fluctuation width Δδ of the water film increases.
その理由として、平均水膜厚さＴが、０．２ｍｍ以下に
なると、局所的な水膜切れが生じ、さらに冷却水ガイド
板３が熱変形し、水膜の変動幅Δδが大きくなったもの
と推定される。また、併せて同図中に鋳造された鋳片凝
固シェルの厚さ偏差Δｄを示しているが、水膜の変動幅
Δδと同じ傾向を示しており、凝固シェルの厚さの均一
化を良好にするには平均水膜厚さＴを（Ｌ２〜３．０ｍ
ｍの範囲に設定することが好ましい。図示省略したが、
上記第４図に示した傾向は、冷却水の流速を６〜４０ｍ
／Ｓの範囲内で変化させた場合も同様であった。The reason for this is that when the average water film thickness T becomes 0.2 mm or less, local breakage of the water film occurs, and furthermore, the cooling water guide plate 3 is thermally deformed, and the fluctuation width Δδ of the water film becomes large. It is estimated to be. In addition, the same figure also shows the thickness deviation Δd of the cast slab solidified shell, which shows the same tendency as the water film variation width Δδ, and the thickness of the solidified shell can be made uniform. To make the average water film thickness T (L2~3.0m
It is preferable to set it within the range of m. Although not shown,
The trend shown in Figure 4 above is that the flow rate of cooling water is 6 to 40 m.
The same result was obtained when the value was changed within the range of /S.
次に、平均水膜厚さ１を０．５ｍｍにして、冷却水の平
均流速を１〜１００ｍ／Ｓの範囲で変化させて、鋳型冷
却水と鋳型表面間の総括伝達係数を調べた結果を第５図
に示す。同図からも判るように、冷却水の平均流速■が
６ ｍ ／ Ｓ未満であると、水膜の水温が上昇して気
泡の発生を招き、冷却能が不足する。また冷却水の平均
流速Ｖが４０ｍ／Ｓ以」二になっても熱伝達係数は余り
上昇せず、冷却水を大量に流すために設備が大損りとな
るので、冷却水の平均流速Ｖは６〜４０ｍ／Ｓの範囲と
することが好ましい。上記の傾向は、水膜の平均水膜厚
さＴを０．２〜３．０Ｍの範囲内で変化させた場合も同
様であった。Next, we set the average water film thickness 1 to 0.5 mm, varied the average flow velocity of the cooling water in the range of 1 to 100 m/s, and investigated the overall transfer coefficient between the mold cooling water and the mold surface. It is shown in FIG. As can be seen from the figure, if the average flow velocity of the cooling water is less than 6 m/s, the water temperature of the water film increases, leading to the generation of bubbles, resulting in insufficient cooling performance. Furthermore, even if the average flow velocity V of the cooling water becomes 40 m/s or more, the heat transfer coefficient will not increase much, and the equipment will be seriously damaged due to the large amount of cooling water flowing, so the average flow velocity V of the cooling water will be It is preferable to set it as the range of 6-40m/S. The above tendency was the same when the average water film thickness T of the water film was changed within the range of 0.2 to 3.0M.
次に本発明の効果を確認するために行った実験の結果に
ついて説明する。Next, the results of experiments conducted to confirm the effects of the present invention will be explained.
１ヒート５０トンの低炭素アルミキルド鋼を、４ｍ／ｍ
ｉｎなる鋳造条件で第１図に示す２段式連続鋳造用鋳型
を供えた連続鋳造機により、厚さ１０５ｍｍ、幅１０５
０ｍｍの鋳片を鋳造した。この際使用した上流側鋳型の
長さは３５０ ｍｍ （メニスカス下２５０ｍｍ）であ
り、下流側鋳型には第２図（イ）に示す短冊状冷却水ガ
イド板（幅： １００ ｍｍ、長さ：５５０ｍｍ）を２
２個取り付けた（（鋳型法面倒１０個、鋳型挾面側１個
）×２）。冷却水ガイド板の給水口、排水口の詳細は次
のとおりである。50 tons of low carbon aluminum killed steel per heat, 4m/m
A continuous casting machine equipped with a two-stage continuous casting mold shown in Fig. 1 was used under casting conditions of 105 mm in thickness and 105 mm in width.
A slab of 0 mm was cast. The length of the upstream mold used at this time was 350 mm (250 mm below the meniscus), and the downstream mold was equipped with a rectangular cooling water guide plate (width: 100 mm, length: 550 mm) shown in Figure 2 (a). ) to 2
Two were attached ((10 on the mold side, 1 on the mold clamping side) x 2). Details of the water inlet and drain outlet of the cooling water guide plate are as follows.
給水口：高さ１．５ｍｍＸ幅１２ｍｍ
排水口：高さ２．２ｍｍＸ幅１２ｍｍ
給水口および排水口の相互間隔：それぞれ２ｍｍ給水口
と排水口の横方向ピッチ：１４ｍｍ給水口列と排水口列
との間隔：５０Ｍ
鋳造中、水膜の平均水膜厚さＴを０．５岨に維持し、冷
却水の流速を１０〜１５ｍ／Ｓの範囲にして鋳造した。Water inlet: Height 1.5 mm x Width 12 mm Drain port: Height 2.2 mm x Width 12 mm Interval between water inlet and drain outlet: 2 mm each Horizontal pitch between water inlet and drain outlet: 14 mm Water inlet row and drain outlet row interval: 50M During casting, the average water film thickness T of the water film was maintained at 0.5 m/s, and the cooling water flow rate was set in the range of 10 to 15 m/s.
その結果、鋳造速度４ｍ／ｍｉｎでも凝固シェル厚さが
確保され、下流側鋳型壁の摩耗、摩擦力の上昇もなかっ
た。As a result, the solidified shell thickness was ensured even at a casting speed of 4 m/min, and there was no wear on the downstream mold wall and no increase in frictional force.
（発明の効果）
以上説明したように本発明によれば、鋳型広面側端部お
よび挟部側下部に形成される空隙による鋳型冷却能低下
を防止し、凝固シェル形成を増進・均一化し、さらに潤
滑の改善により鋳型壁の甚だしい摩耗防止が図られる。(Effects of the Invention) As explained above, according to the present invention, it is possible to prevent a decrease in mold cooling ability due to the voids formed at the end of the wide side of the mold and the lower part of the nip side, to promote and uniformize solidification shell formation, and to Improved lubrication prevents excessive wear on the mold walls.
すなわち、４ｍ／ｍｉｎ以上の高速鋳造が安定して可能
になる。That is, high-speed casting of 4 m/min or more is stably possible.
第１図は本発明鋳型の一実施例を示す図面、第２図は冷
却水ガイド板の説明図であり、（イ）は第１実施例を示
す正面図、（ロ）は第２実施例の要部を示す正面図、（
ハ）は断面して示す側面図、第３図は通常鋳型の鋳型冷
却水と鋳片表面間の統括熱伝達係数の鋳造方向分布を示
す図面、第４図は平均水膜厚さＴと水膜厚さ変動Δδお
よび鋳片凝固シェルの厚さ偏差Δｄとの関係図、第５図
は冷却水平均流速Ｖと、鋳型冷却水と鋳片表面間の総括
熱伝達係数との関係を示す図面である。
１は上流側鋳型、２は下流側鋳型、３は冷却水ガイド板
、４はシリンダ、５は給水口、６は排水口、７は圧力検
知器。
工４
第３図
鋳型上端か５の距畷−飢）
第４図
乎均水ＡｊＩＬ屑さ
Ｓ（」０
第５図Fig. 1 is a drawing showing one embodiment of the mold of the present invention, Fig. 2 is an explanatory diagram of a cooling water guide plate, (a) is a front view showing the first embodiment, and (b) is a diagram of the second embodiment. Front view showing the main parts of (
C) is a cross-sectional side view, Figure 3 is a diagram showing the distribution of the overall heat transfer coefficient between the mold cooling water of a normal mold and the slab surface in the casting direction, and Figure 4 is the average water film thickness T and water A diagram showing the relationship between the film thickness variation Δδ and the thickness deviation Δd of the slab solidified shell, and Figure 5 is a diagram showing the relationship between the average cooling water flow velocity V and the overall heat transfer coefficient between the mold cooling water and the slab surface. It is. 1 is an upstream mold, 2 is a downstream mold, 3 is a cooling water guide plate, 4 is a cylinder, 5 is a water supply port, 6 is a drain port, and 7 is a pressure detector. Work 4 Fig. 3 Upper end of the mold 5.
Claims (2)
対する２対の鋳型壁のうちの何れか一方もしくは両方の
鋳型壁を鋳片鋳込方向に２段以上に分割形成すると共に
、最上流側鋳型壁を除く下流側鋳型壁を複数の冷却水ガ
イド板で鋳片幅方向に分割構成し、対を成す下流側鋳型
壁を構成する前記夫々の冷却ガイド板を互いに接離移動
可能に構成したことを特徴とする連続鋳造用鋳型。(1) In a continuous casting assembly mold having a rectangular cross section, one or both of the two opposing mold walls are divided into two or more stages in the slab casting direction, and the most upstream side The downstream mold wall other than the mold wall is divided in the slab width direction by a plurality of cooling water guide plates, and the cooling guide plates forming the pair of downstream mold walls are movable toward and away from each other. A continuous casting mold characterized by:
す冷却水ガイド板の夫々相対する面に給水口列と排水口
列を交互に設けてこれら給水系及び排水系の圧力を検出
し、この検出値に基づいて鋳片と下流側鋳型壁間に形成
される水膜厚さ、冷却水流速を鋳片幅方向において均一
と成すべく前記対を成す夫々の冷却水ガイド板の接離移
動制御を行うことを特徴とする連続鋳造用鋳型の制御方
法。(2) Water supply port rows and drain port rows are provided alternately on opposing surfaces of the pair of cooling water guide plates constituting the continuous casting mold according to claim 1, and the pressures of these water supply systems and drainage systems are detected. Based on this detected value, the contact between each of the pair of cooling water guide plates is adjusted so that the thickness of the water film formed between the slab and the downstream mold wall and the flow velocity of the cooling water are made uniform in the width direction of the slab. A method for controlling a continuous casting mold, characterized by performing separation control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3664389A JP2808633B2 (en) | 1989-02-16 | 1989-02-16 | Continuous casting mold and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3664389A JP2808633B2 (en) | 1989-02-16 | 1989-02-16 | Continuous casting mold and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02217138A true JPH02217138A (en) | 1990-08-29 |
| JP2808633B2 JP2808633B2 (en) | 1998-10-08 |
Family
ID=12475529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3664389A Expired - Lifetime JP2808633B2 (en) | 1989-02-16 | 1989-02-16 | Continuous casting mold and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2808633B2 (en) |
-
1989
- 1989-02-16 JP JP3664389A patent/JP2808633B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2808633B2 (en) | 1998-10-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3595302A (en) | Cooling structure for continuous-casting mold | |
| RU2310543C2 (en) | Method for correlating heat transfer of molds, namely in zone of metal heel | |
| RU2240892C2 (en) | Liquid-cooled mold | |
| US6315030B1 (en) | High speed continuous casting device and relative method | |
| US6152209A (en) | Method and device for measuring and regulating the temperature and quantity of cooling water for water-coolable walls of a continuous casting mold | |
| JPH02217138A (en) | Mold for continuous casting and controlling method thereof | |
| JP2003311377A (en) | Tube-type mold for continuous casting | |
| MXPA00001023A (en) | Mould plate for a mould with a funnel shaped entry for the continuous casting of metal. | |
| JP6947192B2 (en) | Mold for continuous casting of steel and continuous casting method of steel | |
| CA2420232A1 (en) | Chilled continuous casting mould for casting metal | |
| JPH0366448A (en) | Mold for continuous casting | |
| JPH03297541A (en) | Mold for continuous casting equipment | |
| JPH0810905A (en) | Continuous casting mold for slab | |
| JPH04294843A (en) | Method for controlling mold for continuous casting | |
| CN213080005U (en) | Combined H-shaped crystallizer | |
| JPS62158554A (en) | Continuous casting method | |
| JPH0335849A (en) | Mold for continuous casting and lubricating method thereof | |
| US20230415223A1 (en) | Crystallizer for the continuous casting of a metal product, and corresponding casting method | |
| KR20040097142A (en) | Adjustment of heat transfer in continuous casting moulds in particular in the region of the meniscus | |
| JPH0270358A (en) | Mold for continuous casting | |
| SU1002086A1 (en) | Mould for metal continuous casting plants | |
| CN111774540A (en) | Combined H-shaped crystallizer | |
| JPH02104446A (en) | Method for cooling continuous casting mold, and mold and cooling device for execution thereof | |
| JPH03114627A (en) | Mold for continuous casting | |
| JPH03291148A (en) | Dummy bar for drawing billet and continuous casting method |