JPS6057935B2 - Continuous casting mold - Google Patents
Continuous casting moldInfo
- Publication number
- JPS6057935B2 JPS6057935B2 JP14533882A JP14533882A JPS6057935B2 JP S6057935 B2 JPS6057935 B2 JP S6057935B2 JP 14533882 A JP14533882 A JP 14533882A JP 14533882 A JP14533882 A JP 14533882A JP S6057935 B2 JPS6057935 B2 JP S6057935B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- cooling water
- molten steel
- continuous casting
- level
- 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
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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Description
【発明の詳細な説明】
本発明は連続鋳造用鋳型に係り、詳しくは、連続鋳造時
に溶鋼湯面の変化に応じて鋳型の冷却ゾーンを変化調整
できる連続鋳造用鋳型に係る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous casting mold, and more particularly to a continuous casting mold that can change and adjust the cooling zone of the mold according to changes in the molten steel level during continuous casting.
連鋳々型は約７００７７！７７１の長さを有し、鋳型内
壁は高い熱伝導率を有す銅又は銅合金により構成され、
鋳型内溶鋼は鋳型壁内部に供給される冷却水により間接
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、凝固殼の厚さが内部溶鋼の静圧に耐える程度
まで成長を図り、鋳型下方に引抜かれてゆく。この鋳型
による冷却の良否は鋳片の表面品質に−重大な影響を及
ぼすほか、ブレイクアウト等の事故原因ともなりこれら
冷却は第１図に示す如く行なわれている。The continuous mold has a length of about 70077!771, and the inner wall of the mold is made of copper or copper alloy with high thermal conductivity.
The molten steel in the mold is indirectly cooled by the cooling water supplied inside the mold wall, and solidification progresses gradually from the part in contact with the mold wall, and the thickness of the solidified shell grows to the extent that it can withstand the static pressure of the molten steel inside. The mold is pulled out downwards. The quality of cooling by the mold has a significant effect on the surface quality of the slab, and can also cause accidents such as breakouts. Cooling is performed as shown in FIG. 1.
すなわち、鋳型１の内壁を内方に傾斜させ鋳型１の下方
から上方に冷却水が流れるように冷却水；供給口７、排
出口８を有するバックフレーム２を鋳型背面に固設し、
この供給口７ならびに排出口８間の冷却水通路に高速で
冷却水を流すことで冷却を行なつている。That is, a back frame 2 having a cooling water supply port 7 and a discharge port 8 is fixed to the back of the mold so that the inner wall of the mold 1 is inclined inward so that the cooling water flows from below to above the mold 1.
Cooling is performed by flowing cooling water at high speed through the cooling water passage between the supply port 7 and the discharge port 8.
しかしながら、この鋳型であると、モールドパウダー６
を使用して溶鋼３を連続鋳造する場合、モールドパウダ
ーの特性にもよるが溶鋼３上で溶融されたパウダー６が
鋳型１によつて冷却され、鋳型１の壁上で固化し、所謂
スラグベア５が形成される。このスラグベア５が形成さ
れると、鋳型１と凝固シェル４との間のモー”ルドパウ
ダー６の供給が阻害され、元来この間はモールドパウダ
ー６によつて潤滑状態が保持されているのであるが、こ
の潤滑が悪化し、鋳造品の品質の悪化や、拘束性ブレー
クアウトが誘発される。本発明は上記欠点の解決を目的
とし、具体的には、鋳型内の湯面レベルに応じて冷却水
による冷却ゾーンを変化調整できる連続鋳造用鋳型を提
案する。However, with this mold, mold powder 6
When continuously casting molten steel 3 using a mold powder, the powder 6 molten on the molten steel 3 is cooled by the mold 1 and solidified on the wall of the mold 1, forming a so-called slag bear 5. is formed. When this slag bear 5 is formed, the supply of mold powder 6 between the mold 1 and the solidified shell 4 is obstructed, and a lubricated state is originally maintained by the mold powder 6 during this period. , this lubrication deteriorates, leading to deterioration in the quality of the cast product and to induction of restraint breakout.The present invention aims to solve the above-mentioned drawbacks. We propose a continuous casting mold that can change and adjust the water cooling zone.
すなわち、本発明は連続鋳造される溶鋼の降下方向と対
向して上向きに冷却水を上昇させて鋳型内壁面を冷却す
る冷却水通路の溶鋼湯面レベルとして予定される最上部
の近傍から下向きに間隔をおいて前記冷却水の排出口を
複数個設け、更に、各排出口には冷却水の調整弁を設け
て成ることを特徴とする。That is, the present invention raises the cooling water upward opposite to the descending direction of the continuously cast molten steel to cool the inner wall surface of the mold. A plurality of the cooling water discharge ports are provided at intervals, and each discharge port is further provided with a cooling water regulating valve.
以下、本発明について詳しく説明する。The present invention will be explained in detail below.
ます、本発明者等は上記のところの鋳型のもつ欠点につ
いて研究したところ、従来例に係る連続鋳造用鋳型内に
設けられた冷却水通路はその排出口が固定されて変化で
きないこと、すなわち、鋳型冷却水通路の排出口が一定
レベルであるため、溶鋼の湯面レベルの高低によつて溶
融モールドパウダーが冷却されることがわかつた。First, the present inventors studied the drawbacks of the above-mentioned mold, and found that the cooling water passage provided in the conventional continuous casting mold has a fixed outlet and cannot be changed. It was found that since the outlet of the mold cooling water passage was at a constant level, the molten mold powder was cooled depending on the level of the molten steel.
そこで、湯面レベルの変化に応じで、鋳型内の冷却状況
、つまり冷却ゾーンを変えることができれば上記の問題
が解消できる。本発明は上記知見にもとづいて成立した
ものであつて、鋳型内溶鋼の湯面レベルに応じて、鋳型
上端部における冷却水の量を調節し、溶融モールドパウ
ダーを固化操業することを可能とする。Therefore, if the cooling situation in the mold, that is, the cooling zone, could be changed in response to changes in the melt level, the above problem could be solved. The present invention was established based on the above knowledge, and it is possible to solidify molten mold powder by adjusting the amount of cooling water at the upper end of the mold according to the level of molten steel in the mold. .
すなわち、第２図は本発明の一つの実施例に係る連続鋳
造用鋳型の一部を示す縦断面図であつて、この鋳型は第
１図に示す従来例の鋳型と同様に銅板等の鋳型１とバッ
クフレーム２との間に冷却水通路１４が設けられている
。この冷却水通路１４内では溶鋼３の降下時にその降下
方向に対向するよう、冷却水は供給口７から入つて上向
きに流動し、鋳型１の内壁面を冷却する。この鋳型にお
いてその冷却水通路４の上部、つまり、溶鋼３の湯面レ
ベルとして予定される最上部の近傍から下向きに複数個
の排出口、例えば、第２図に示す例ては３つの排出口８
，９，１０を設けて、更に、各排出口８，９，１０にそ
れぞれ調整弁１１，１２，１３を取付ける。That is, FIG. 2 is a vertical sectional view showing a part of a continuous casting mold according to an embodiment of the present invention, and this mold is similar to the conventional mold shown in FIG. A cooling water passage 14 is provided between the back frame 1 and the back frame 2. In this cooling water passage 14, the cooling water enters from the supply port 7 and flows upward to cool the inner wall surface of the mold 1 so as to be opposite to the descending direction of the molten steel 3 when it descends. In this mold, a plurality of discharge ports, for example, three discharge ports in the example shown in FIG. 8
, 9, and 10 are provided, and furthermore, regulating valves 11, 12, and 13 are attached to each of the discharge ports 8, 9, and 10, respectively.
このように鋳型の冷却水通路を構成すると、溶鋼湯面レ
ベルの変化にかかわらず、従来例の鋳型と相違して、鋳
型内壁面は良好に冷却され、所謂スラグベア等が生じな
い。一般に、連続鋳造用鋳型はすでに第１図によつて示
した通り冷却水通路は縦方向に平行状に多数形成され、
その頂部に冷却水の排出口が形成されるのに対し、下部
に冷却水の供給口が形成され、これら排出口と供給口を
有するバックフレームは鋳型背面にボルト止め等の手段
で固設されている。By configuring the mold cooling water passage in this way, unlike conventional molds, the mold inner wall surface is cooled well and so-called slag bears do not occur, regardless of changes in the molten steel level. Generally, as already shown in FIG. 1, continuous casting molds have a large number of cooling water passages formed in parallel in the vertical direction.
A cooling water outlet is formed at the top, while a cooling water supply port is formed at the bottom, and the back frame with these outlet and supply ports is fixed to the back of the mold by means such as bolting. ing.
従つて、この構造の鋳型では各部の抜熱能力は、鋳型の
上部ならびに下部の間、巾方向に渡つて等しい。Therefore, in a mold having this structure, the heat extraction capacity of each part is equal between the upper and lower parts of the mold in the width direction.
このため、注入される溶鋼の鋳型内レベルは、注入及び
引抜条件の変化によつて変動するにも拘らず、第１図に
示す如く、溶鋼湯面レベルの位置が低い場合には従来例
の鋳型では湯面レベル以上のところでも均一に冷却され
ているため、その表面に溶融しているモールドパウダー
が冷却されて固化し、スラグベアが形成される。その結
果、スラグベアの発生部位より下位へはモールドパウダ
ーの供給が止まり、上記問題が生じる。これに対し、本
発明に係る鋳型においては冷却水通路の排出口が高さ方
向に複数配設され、鋳型内湯面レベルの変動に応じて、
上記冷却水排出口からの排出水量が変化するため、第１
図に示す如く湯面レベルが低下しても、それに応じて上
部の抜熱能力が低下させることができる。更に詳しく説
明すると、本発明に係る鋳型では第２図に示す如く冷却
水は３つの排出口８，９，１０から成り、各排出口はそ
の流量を調整するために調整弁１１，１２，１３が設け
られている。For this reason, even though the level of injected molten steel in the mold fluctuates due to changes in injection and drawing conditions, when the molten steel surface level is low as shown in Figure 1, the level of the molten steel in the mold is low. Since the mold is uniformly cooled even above the molten metal level, the mold powder molten on its surface is cooled and solidified, forming slag bears. As a result, the supply of mold powder stops below the site where slag bears occur, causing the above-mentioned problem. On the other hand, in the mold according to the present invention, a plurality of discharge ports of the cooling water passage are arranged in the height direction, and according to fluctuations in the mold level,
Since the amount of water discharged from the cooling water outlet changes,
As shown in the figure, even if the hot water level falls, the heat removal capacity of the upper part can be reduced accordingly. To explain in more detail, in the mold according to the present invention, as shown in FIG. 2, the cooling water consists of three outlets 8, 9, and 10, and each outlet has a regulating valve 11, 12, 13 to adjust its flow rate. is provided.
従つて、例えば、鋳型内の溶鋼湯面レベルが排出口８，
９の間にある場合には、調整弁１３は閉じ、３０％程度
の冷却水を排出口８から排出し、残りは排出口９から流
出させる。このため、モールドパウダーの浮遊する位置
の抜熱能力は削減され、溶融パウダー６の固化は抑制さ
れて、スラグベアが生じない。また、溶鋼の湯面レベル
が排出口９，１０の間に低下したときには、調整弁１３
は全開となり、冷却水は排出口８からは１０％、排出口
９からは２０％、排出口から残りが流出するように制御
し、同様の効果を達成する。なお、これらの制御は湯面
レベルを自動的に検出し、その検出信号によつて各調整
弁を制御する・と、容易に自動的に行なうことが可能で
ある。次に、第１図に示す従来例の鋳型と第２図に示す
本発明に係る鋳型とを用いて、２２０×（９００〜１５
５０）順のスラブを連続鋳造し、この際の表面欠陥発生
率、拘束性ブレークアウト発生率を求めた・ところ、次
の通りであつた。（１）表面欠陥発生率
従来例 ０．２５％
本発明 ０．０５％
（２）拘束性ブレークアウト発生率
ｊ 従来例 １．粛／１０００ストランド 本発
明 ０渇件／１０００ストランドなお、鋳造条件は次
の通りである。Therefore, for example, if the molten steel surface level in the mold is at the outlet 8,
9, the regulating valve 13 is closed, approximately 30% of the cooling water is discharged from the outlet 8, and the remainder is discharged from the outlet 9. Therefore, the heat removal capacity of the mold powder floating position is reduced, the solidification of the molten powder 6 is suppressed, and slag bears do not occur. Further, when the level of molten steel drops between the discharge ports 9 and 10, the regulating valve 13
is fully opened, the cooling water is controlled so that 10% of the cooling water flows out from the outlet 8, 20% from the outlet 9, and the rest flows out from the outlet to achieve the same effect. Note that these controls can be easily and automatically performed by automatically detecting the hot water level and controlling each regulating valve based on the detected signal. Next, using the conventional mold shown in FIG. 1 and the mold according to the present invention shown in FIG.
50) The successive slabs were continuously cast, and the surface defect occurrence rate and restraint breakout occurrence rate were determined as follows. (1) Surface defect occurrence rate Conventional example 0.25% Present invention 0.05% (2) Restrictive breakout occurrence rate j Conventional example 1. 0 strands/1000 strands The present invention 0 strands/1000 strands The casting conditions are as follows.
溶鋼成分：Ｃ／０．０５〜０．４５ Ｍｎ／０．２０〜１．５０ Ｓｉ／０．０３〜０．３５ Ｐ／０．０１５５〜０．１５０ Ｓ／０．００３〜０．０３０ 鋳込速度：０．９〜１．８ｍ１／ＭｉｎMolten steel composition: C/0.05-0.45 Mn/0.20~1.50 Si/0.03~0.35 P/0.0155~0.150 S/0.003~0.030 Casting speed: 0.9~1.8m1/Min
第１図は従来例に係る連続鋳造用鋳型の一部の縦断面図
、第２図は本発明の一つの実施例に係る連続鋳造用鋳型
の一部の縦断面図である。
符号、１・・・・・・鋳型銅板、２・・・・・・バック
フレーム、３・・・・・・溶鋼、４・・・・・・凝固シ
ェル、５・・・・・・スラグベア、６・・・・・・モー
ルドパウダー、７・・・・・・冷却水供給口、８，９，
１０・・・・・・冷却水排出口、１１，１２，１３・・
・・・・調整弁、１４・・・・冷却水通路。FIG. 1 is a longitudinal sectional view of a part of a continuous casting mold according to a conventional example, and FIG. 2 is a longitudinal sectional view of a part of a continuous casting mold according to an embodiment of the present invention. Code, 1...Mold copper plate, 2...Back frame, 3... Molten steel, 4... Solidified shell, 5... Slag bear, 6...Mold powder, 7...Cooling water supply port, 8,9,
10... Cooling water outlet, 11, 12, 13...
...Adjustment valve, 14...Cooling water passage.
Claims (1)
冷却水を上昇させて鋳型内壁面を冷却する冷却水通路の
溶鋼湯面レベルとして予定される最上部の近傍から下向
きに間隔をおいて前記冷却水の排出口を複数個設け、更
に、各排出口には冷却水の調整弁を設けて成ることを特
徴とする連続鋳造用鋳型。1 At intervals downward from the vicinity of the top of the cooling water passage, which is intended to be the molten steel surface level, in which cooling water is raised upward opposite to the descending direction of molten steel to be continuously cast to cool the inner wall surface of the mold. A mold for continuous casting, characterized in that a plurality of the cooling water discharge ports are provided, and each discharge port is further provided with a cooling water regulating valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14533882A JPS6057935B2 (en) | 1982-08-20 | 1982-08-20 | Continuous casting mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14533882A JPS6057935B2 (en) | 1982-08-20 | 1982-08-20 | Continuous casting mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5935856A JPS5935856A (en) | 1984-02-27 |
| JPS6057935B2 true JPS6057935B2 (en) | 1985-12-17 |
Family
ID=15382859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14533882A Expired JPS6057935B2 (en) | 1982-08-20 | 1982-08-20 | Continuous casting mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6057935B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2148374T3 (en) * | 1994-06-06 | 2000-10-16 | Danieli Off Mecc | METHOD FOR CONTROLLING THE DEFORMATIONS OF THE SIDE WALLS OF A GLASS, AND CONTINUOUS CAST GLASS. |
| EP0686446B1 (en) * | 1994-06-06 | 2000-08-16 | DANIELI & C. OFFICINE MECCANICHE S.p.A. | Continuous-casting crystalliser with increased heat exchange and method to increase the heat exchange in a continuous-casting crystalliser |
| DE69518360T2 (en) * | 1994-06-06 | 2000-12-28 | Danieli Off Mecc | Continuous casting mold with improved heat exchange and method for increasing the heat exchange of a continuous casting mold |
-
1982
- 1982-08-20 JP JP14533882A patent/JPS6057935B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5935856A (en) | 1984-02-27 |
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