JPH02205234A - Method for detecting molten metal surface level in cast strip continuous casting - Google Patents
Method for detecting molten metal surface level in cast strip continuous castingInfo
- Publication number
- JPH02205234A JPH02205234A JP1022530A JP2253089A JPH02205234A JP H02205234 A JPH02205234 A JP H02205234A JP 1022530 A JP1022530 A JP 1022530A JP 2253089 A JP2253089 A JP 2253089A JP H02205234 A JPH02205234 A JP H02205234A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- hot water
- contact
- detection terminal
- eddy current
- 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
- 239000002184 metal Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000009749 continuous casting Methods 0.000 title claims description 10
- 238000005266 casting Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000001514 detection method Methods 0.000 claims description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
- 239000000155 melt Substances 0.000 claims 1
- 230000000630 rising effect Effects 0.000 claims 1
- 230000007246 mechanism Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000220317 Rosa Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/186—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by using electric, magnetic, sonic or ultrasonic means
-
- 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
- B22D11/0637—Accessories therefor
- B22D11/064—Accessories therefor for supplying molten metal
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、溶融金属を急冷・凝固して薄肉鋳片を連続鋳
造する際、湯面り部に注湯された溶融金属の湯面レベル
を検出する方法に関する。Detailed Description of the Invention (Industrial Field of Application) The present invention is aimed at controlling the level of the molten metal poured into the molten metal surface area when continuously casting thin slabs by rapidly cooling and solidifying the molten metal. Concerning how to detect.
（従来の技術）
溶融金属から最終形状に近い薄肉鋳片を鋳造するとき、
後続する圧延や熱処理等の工程が簡略化されるため、設
備に対する負担が軽減される。たとえば、旧来の連鋳機
では、鋳造されたスラブな粗圧延、熱間圧延して帯板と
し、この帯板を冷間圧延工程に搬送していた。しかし、
冷間圧延工程に直接送り込むことができる薄肉の鋳片が
得られると、熱間圧延を省略することができ、また冷間
圧延に・先立ち帯板を熱処理する必要もなくなる。(Prior art) When casting thin slabs close to the final shape from molten metal,
Since subsequent steps such as rolling and heat treatment are simplified, the burden on equipment is reduced. For example, in a conventional continuous casting machine, a cast slab was roughly rolled and hot rolled into a strip, and the strip was conveyed to a cold rolling process. but,
If a thin slab is obtained that can be fed directly into the cold rolling process, hot rolling can be omitted and there is no need to heat treat the strip prior to cold rolling.
このような観点から、薄肉鋳片を溶融金属から直接製造
する方法として、単ロール方式、双ロール方式、単ベル
ト方式、双ベルト方式、ロール−ベルト方式等の各種の
連続鋳造方法が提案されている。これらの方法において
は、何れも湯溜り部に注湯された溶融金属を冷却ロール
或いはベルトを介して抜熱し、その上に凝固シェルを生
成させる。凝固シェルは、冷却ロール、ベルト等の回転
成いは走行に伴って成長しながら、鋳造空間から薄肉鋳
片として送り出される。From this point of view, various continuous casting methods such as single roll method, twin roll method, single belt method, double belt method, and roll-belt method have been proposed as methods for directly manufacturing thin slabs from molten metal. There is. In all of these methods, heat is removed from molten metal poured into a sump via a cooling roll or belt, and a solidified shell is formed thereon. The solidified shell is sent out from the casting space as a thin slab while growing as the cooling rolls, belts, etc. rotate and run.
薄肉鋳片の形状、特に厚みを一定化させるためには、溶
融金属が冷却ロール又はベルトに接触して凝固シェルが
成長する時間を正確にコントロールすることが必要であ
る。そこで、湯面レベルを適宜の手段で検出し、湯面レ
ベルが設定値より低いときには注湯量を多くし、高いと
きには注湯量を少なくすることによって、湯溜り部の湯
面レベルを常に一定に維持する方法が採用される。In order to keep the shape, especially the thickness, of the thin slab constant, it is necessary to accurately control the time during which the molten metal contacts the cooling roll or belt and the solidified shell grows. Therefore, by detecting the hot water level using an appropriate means and increasing the amount of hot water poured when the hot water level is lower than the set value, and decreasing the amount of hot water poured when it is higher, the hot water level in the pool is always maintained at a constant level. The method will be adopted.
湯面レベル検出用の測定器としては、湯溜り部に注湯さ
れた溶融金属が導体であることに着目した渦電流センサ
ーが、特殊条件下に適した測定器といえる。しかし、渦
電流センサーは、分解能には優れているものの、周囲の
影響を受は易い。そのため、周囲にある磁場の強弱や導
体の有無等に応じて、測定結果が大きく異なってくる。As a measuring device for detecting the level of hot water, an eddy current sensor that focuses on the fact that the molten metal poured into the pool is a conductor can be said to be a suitable measuring device under special conditions. However, although eddy current sensors have excellent resolution, they are easily influenced by the surrounding environment. Therefore, the measurement results will vary greatly depending on the strength of the surrounding magnetic field, the presence or absence of conductors, etc.
そこで、本発明者等は、渦電流センサーと通電電極型セ
ンサーとを併用することによって、渦電流センサーに対
する周囲の影響を排除しながら、高い精度で湯面レベル
を検出する方法を開発し、特願昭６３−２６８２５４号
として出願した。Therefore, the present inventors developed a method of detecting the hot water level with high accuracy by using an eddy current sensor and a current-carrying electrode type sensor while eliminating the influence of the surroundings on the eddy current sensor. The application was filed as Application No. 63-268254.
第４図は、この方法を組み込んだ異径双ロール方式の連
続鋳造機を示す。この連続鋳造機は、互いに逆方向に回
転する小径上ロール１ａと大径下ロール１ｂとを備えて
おり、これら冷却ロール１ａ、ｌｂの間に湯溜り部２の
ノズル部３が開口している。この湯溜り部２は、両側部
が大径下ロール１ｂの周面に対向するサイド堰（図示せ
ず）で仕切られ、タンデイツシュ等の中間容器から注湯
ノズル４を介して溶融金属が注入される。FIG. 4 shows a continuous casting machine with twin rolls of different diameters incorporating this method. This continuous casting machine is equipped with a small-diameter upper roll 1a and a large-diameter lower roll 1b that rotate in opposite directions, and a nozzle part 3 of a sump part 2 opens between these cooling rolls 1a and lb. . This pool 2 is partitioned on both sides by side weirs (not shown) facing the circumferential surface of the large-diameter lower roll 1b, and molten metal is injected from an intermediate container such as a tundish through a pouring nozzle 4. Ru.
湯溜り部２には通電電極型センサー５が配置されており
、湯溜り部２の上方に渦電流型センサー６が配置されて
いる。通電電極型センサー５は、長尺の共通電極と、長
さの異なる複数の対向電極を備えており、これら共通電
極と対向電極との間の導通状態によって、湯面７のレベ
ルを多段階で検出する。他方、渦電流型センサー６とし
ては、コイルで発生した磁束が湯溜り部２を通過するこ
とによりて変化する磁束密度の変化分を検出値とする通
常タイプのものが使用される。A current-carrying electrode type sensor 5 is arranged in the water reservoir 2, and an eddy current sensor 6 is arranged above the water reservoir 2. The current-carrying electrode type sensor 5 is equipped with a long common electrode and a plurality of counter electrodes of different lengths, and the level of the hot water level 7 can be adjusted in multiple stages depending on the conduction state between the common electrode and the counter electrodes. To detect. On the other hand, as the eddy current type sensor 6, a normal type sensor is used, which detects a change in magnetic flux density as a result of the magnetic flux generated by the coil passing through the water reservoir 2.
湯溜り部２に溶融金属が注入されると、湯面７が上昇し
、通電電極型センサー５の電極に接触するようになる。When molten metal is poured into the pool 2, the level 7 of the molten metal rises and comes into contact with the electrode of the energized electrode type sensor 5.
その結果、共通電極と所定の対向電極との間が導通状態
になり、湯面７が所定の対向電極の下端にあることが検
出される。この検出値を制御機構８に入力し、渦電流型
センサー６からの湯面レベルに関する検出値を補正する
。この通電電極型センサー５によって検出される湯面レ
ベルの測定誤差は、検出用電極の長さ設定の精度と同様
な約±０．５ｍｍの範囲に収められる。そして、この通
電電極型サンサー５の検出値を補正入力として制御機構
８に取り込むｈのであるから、渦電流型センサー６に対
する周囲の影響を排除しながら高蹟度で湯面レベルの測
定が行われる。As a result, conduction is established between the common electrode and the predetermined counter electrode, and it is detected that the hot water level 7 is at the lower end of the predetermined counter electrode. This detected value is input to the control mechanism 8, and the detected value regarding the hot water level from the eddy current type sensor 6 is corrected. The measurement error of the hot water level detected by this current-carrying electrode type sensor 5 is within a range of approximately ±0.5 mm, which is the same as the accuracy of the length setting of the detection electrode. Since the detected value of the energized electrode type sensor 5 is inputted to the control mechanism 8 as a correction input, the hot water level can be measured at high turbulence while eliminating the influence of the surroundings on the eddy current type sensor 6. .
（発明が解決しようとする課運）
先願で提案した方法においては、通電電極型センサー５
の検出用電極が溶融金属に接触し導通状態になることを
前提としている。このため、通電電極型センサー５の検
出用電極に溶融金属が付着することが避けられない。付
着した溶融金属は、検出用電極の間でブリッジとなって
凝固しがちであり、その後に湯面７が降下した場合にあ
っても検出用電極を導通状態に維持する恐れがある。(Problem to be solved by the invention) In the method proposed in the earlier application, the current-carrying electrode type sensor 5
It is assumed that the detection electrode contacts the molten metal and becomes conductive. Therefore, adhesion of molten metal to the detection electrode of the current-carrying electrode type sensor 5 is unavoidable. The adhered molten metal tends to form a bridge between the detection electrodes and solidify, and there is a risk that the detection electrodes may be maintained in a conductive state even if the molten metal level 7 subsequently falls.
この点で、検出用電極の導通状態を基にした方式は、鋳
込み開始時における湯面レベルの検出に適するものの、
湯溜り部２における溶融金属が定常状態に達した後では
精度良く湯面レベルを検出することができない。すなわ
ち、鋳込み開始時には、注湯に従って湯面レベルが上昇
傾向にあり、検出用電極な導通状態にするブリッジが形
成されていないので、検出用電極に溶融金属が接触した
か否かを正確に検出することができる。In this respect, although the method based on the conduction state of the detection electrode is suitable for detecting the level of the molten metal at the start of casting,
After the molten metal in the pool 2 reaches a steady state, the level of the molten metal cannot be detected with high accuracy. In other words, at the start of pouring, the level of the molten metal tends to rise as the metal pours, and the bridge that makes the detection electrode conductive has not been formed, making it possible to accurately detect whether or not the molten metal has come into contact with the detection electrode. can do.
他方、湯溜り部２に注湯された溶融金属が定常状態に達
したときに、渦電流型センサー６の出力は、湯溜り部２
からの輻射熱による温度上昇、治具の熱変形等に起因し
て変動する。このとき、検出用電極の間にブリッジが形
成されていると、検出用電極が導通しており、通電電極
型センサー５による湯面検出ができない状態にある。し
かも、定常状態にあっても、湯面７は鋳造条件の変動等
に対応して上下動し、冷却ロール１ａ、１ｂの周面で形
成される凝固シェルの厚みや表面性状に影響を与え易い
。On the other hand, when the molten metal poured into the molten metal pool 2 reaches a steady state, the output of the eddy current sensor 6
Fluctuations occur due to temperature rise due to radiant heat from the machine, thermal deformation of the jig, etc. At this time, if a bridge is formed between the detection electrodes, the detection electrodes are electrically connected and the current-carrying electrode type sensor 5 cannot detect the hot water level. Moreover, even in a steady state, the molten metal surface 7 moves up and down in response to changes in casting conditions, etc., which tends to affect the thickness and surface properties of the solidified shell formed on the circumferential surfaces of the cooling rolls 1a and 1b. .
そこで、本発明は、渦電流型センサーに入力する補正情
報を接触型検出用端子の移動量から得ることによって、
溶融金属の付着如何に拘らず高精度で湯面レベルを検出
し、渦電流型センサーの測定精度に対する雰囲気条件、
熱条件等の影響を排除しながら、湯溜り部の状態を正確
に把握し、安定した条件下で薄肉鋳片を鋳造することを
目的とする。Therefore, the present invention obtains correction information to be input to the eddy current sensor from the amount of movement of the contact detection terminal.
Detects the level of molten metal with high accuracy regardless of whether molten metal is attached, and determines the atmospheric conditions for the measurement accuracy of the eddy current sensor.
The purpose is to accurately grasp the condition of the sump while eliminating the influence of thermal conditions, etc., and to cast thin slabs under stable conditions.
（課題を解決するための手段）
本発明は、その目的を達成するために、冷却ロール及び
／又はベルトで区画された湯溜り部に注湯された溶融金
属を前記冷却ロール及び／又はベルトを介した抜熱によ
り冷却・凝固し、薄肉鋳片を連続鋳造する際、前記湯溜
り部の上方に渦電流型センサーを配置し、且つ接触型検
出用端子を前記湯溜り部の上方に上下動可能に配置し、
基準点から前記湯溜り部の湯面に接する位置まで下降す
る前記接触型検出用端子の移動量、或いは前記湯溜り部
の湯面に接した位置から上昇する前記接触型検出用端子
の移動量を測定し、該移動量に基づいて前記渦電流型セ
ンサーで検出された測定値を補正することを特徴とする
。(Means for Solving the Problems) In order to achieve the object, the present invention aims to transfer molten metal poured into a pool section partitioned by cooling rolls and/or belts to the cooling rolls and/or belts. When continuously casting thin slabs, an eddy current sensor is placed above the pool, and a contact detection terminal is moved up and down above the pool. possible placement,
The amount of movement of the contact type detection terminal as it descends from a reference point to a position in contact with the hot water surface of the hot water pool, or the amount of movement of the contact type detection terminal as it rises from a position in contact with the hot water surface of the hot water pool. The present invention is characterized in that the measured value detected by the eddy current sensor is corrected based on the amount of movement.
（作用）
以下、図面を参照しながら、本発明の特徴を、その作用
と共に具体的に説明する。(Function) Hereinafter, the features of the present invention will be specifically explained along with its function with reference to the drawings.
第１図は、渦電流型センサーに対する補正情報を得るた
め、湯面レベルを接触式で直接測定する機構を示す。す
なわち、接触型検出用端子９を湯面７の上方に配置し、
この接触型検出用端子９をステッピングモータ１０等回
転を正確に測定できるモータにより一定の速度で昇降さ
せる。接触型検出用端子９は、その下端が湯面７に接触
したときに電流が流れるようにした黒鉛電極で構成され
、基準点Ａと接触点Ｂとの間を上下動する。そして、基
準点Ａに接触型検出用端子９があるか否かを検出するた
め、発光素子１１ａ及び受光素子１１ｂからなる光学系
を設けている。たとえば、発光素子１１ａから出射され
たレーザービーム等の光路１１ｃが接触型検出用端子９
で遮られたとき、接触型検出用端子９が基準点Ａにある
と判定する。なお、基準点Ａにおける接触型検出用端子
９の検出には、リミットスイッチ等の検出素子を使用す
ることもできる。FIG. 1 shows a mechanism for directly measuring the hot water level by contact in order to obtain correction information for the eddy current sensor. That is, the contact type detection terminal 9 is arranged above the hot water level 7,
This contact type detection terminal 9 is raised and lowered at a constant speed by a motor such as a stepping motor 10 whose rotation can be accurately measured. The contact type detection terminal 9 is composed of a graphite electrode through which a current flows when its lower end contacts the hot water surface 7, and moves up and down between the reference point A and the contact point B. In order to detect whether or not the contact type detection terminal 9 is present at the reference point A, an optical system consisting of a light emitting element 11a and a light receiving element 11b is provided. For example, the optical path 11c of the laser beam etc. emitted from the light emitting element 11a is connected to the contact detection terminal 9.
, it is determined that the contact type detection terminal 9 is at the reference point A. Note that a detection element such as a limit switch may also be used to detect the contact type detection terminal 9 at the reference point A.
この状態から、ステッピングモータ１０の駆動により接
触型検出用端子９を接触点Ｂまで下降させる。このとき
、接触型検出用端子９として黒鉛電極を使用したものに
あっては、ワイヤを介して接触型検出用端子９に電圧を
印加しておく、この接触型検出用端子９が湯面７に接触
すると電流が流れ始めるので、この電流の有無を検出し
て、接触点Ｂに接触型検出用端子９があるか否かを判定
する。また逆に、接触型検出用端子９を接触点Ｂにセッ
トし、この状態から接触型検出用端子９を上昇させて、
基準点Ａまでの移動量を検出することもできる。From this state, the contact type detection terminal 9 is lowered to the contact point B by driving the stepping motor 10. At this time, if a graphite electrode is used as the contact type detection terminal 9, a voltage is applied to the contact type detection terminal 9 via a wire. When the contact point B is contacted, a current starts to flow, so the presence or absence of this current is detected to determine whether the contact type detection terminal 9 is present at the contact point B. Conversely, the contact type detection terminal 9 is set at the contact point B, and the contact type detection terminal 9 is raised from this state.
The amount of movement to the reference point A can also be detected.
基準点Ａから接触点Ｂまでの移動量は、ステッピングモ
ータ１０のステップ数をカウントすることで知ることが
できる。これにより、湯面７のレベルが１０．１ｍｍ以
下の高精度で実測される。The amount of movement from the reference point A to the contact point B can be determined by counting the number of steps of the stepping motor 10. Thereby, the level of the hot water surface 7 is actually measured with high accuracy of 10.1 mm or less.
得られた湯面レベルの検出値は、第４図の場合と同様に
、制御機構８に入力され、渦電流型センサー６からの測
定値を補正する情報として使用される。The obtained detected value of the hot water level is input to the control mechanism 8, as in the case of FIG. 4, and is used as information for correcting the measured value from the eddy current sensor 6.
この方式においては、基準点Ａを湯面７から離れた位置
に設定することができるため、接触型検出用端子９が湯
面７からの輻射熱を受けて高温に曝されることがない。In this method, since the reference point A can be set at a position away from the hot water surface 7, the contact type detection terminal 9 is not exposed to high temperatures due to radiant heat from the hot water surface 7.
そのため、温度、熱膨張等の影響を受けることなく、高
精度で湯面７が測定される。また、接触型検出用端子９
の先端に溶融金属が一度付着した場合にあっても、導通
状態に基づいて湯面レベルを検出する方式でないため、
緑返し接触型検出用端子９を使用することができる。そ
して、接触点Ｂにおける接触型検出用端子９は、光セン
サー等によって検出されるため、付着した溶融金属或い
は地金等による影響を受けることがない。Therefore, the hot water level 7 can be measured with high accuracy without being affected by temperature, thermal expansion, etc. In addition, contact type detection terminal 9
Even if molten metal adheres to the tip of the molten metal, there is no method to detect the molten metal level based on the conduction state.
A green contact type detection terminal 9 can be used. Since the contact detection terminal 9 at the contact point B is detected by an optical sensor or the like, it is not affected by attached molten metal or base metal.
なお、接触型検出用端子９を昇降させる場合、その位置
が渦電流型センサー６の測定結果に影響を及ぼすことが
ある。そこで、接触型検出用端子９の周囲にシールド板
１２を配置することが好ましい。第２図は、このシール
ド板１２によって、接触型検出用端子９と渦電流型セン
サー６との間が遮られていることを示す平面図である。Note that when the contact detection terminal 9 is moved up and down, its position may affect the measurement results of the eddy current sensor 6. Therefore, it is preferable to arrange a shield plate 12 around the contact type detection terminal 9. FIG. 2 is a plan view showing that the contact detection terminal 9 and the eddy current sensor 6 are blocked by the shield plate 12.
また、注湯或いは鋳造時における湯面７は波立フている
ことが多く、この波立ちが接触型検出用端子９による測
定結果に影響を与えやすい。この場合、多数個所に接触
型検出用端子９を配置し、何れか１個或いは複数個、の
接触型検出用端子９が湯面７に接触したことを基にして
湯面レベルを判定すると、波立ちによる影響が抑えられ
る。Further, the molten metal surface 7 during pouring or casting is often rippled, and these ripples tend to affect the measurement results by the contact type detection terminal 9. In this case, if contact-type detection terminals 9 are arranged at multiple locations and the hot water level is determined based on whether one or more contact-type detection terminals 9 come into contact with the hot water surface 7, The effects of ripples are suppressed.
（実施例）
連続鋳造機としては、基本的に第４図に示した設備構成
をもつものを使用した。ただし、第４図の通電電極型セ
ンサー５に代えて、第１図に示した接触型検出用端子９
を組み込んだ。(Example) As a continuous casting machine, one having basically the equipment configuration shown in FIG. 4 was used. However, instead of the current-carrying electrode type sensor 5 shown in FIG. 4, the contact type detection terminal 9 shown in FIG.
Incorporated.
ステンレス鋼５ＵＳ３０４組成の溶鋼を湯溜り部２に注
湯し、肉厚２．０ｍｍで板幅６５０ｍｍの薄肉鋳片を鋳
造した。このとき、注湯開始に伴って湯溜り部２に供給
された溶鋼の湯面７は、渦電流型センサー６で測定した
ところでは第３図に示すような上昇曲線をとっていた。Molten steel having the composition of stainless steel 5US304 was poured into the sump 2, and a thin slab having a wall thickness of 2.0 mm and a plate width of 650 mm was cast. At this time, the level 7 of the molten steel supplied to the pool 2 with the start of pouring had an upward curve as shown in FIG. 3, as measured by the eddy current sensor 6.
ところが、注湯途中の時点ｔ、で、湯面７を接触型検出
用端子９で実測したところ、渦電流型センサー６の検出
値に△ｈ１の誤差が生じていた。そこで、この誤差△ｈ
、を制御機構８で演算して、渦電流型センサー６による
検出値を上方修正した。However, when the hot water level 7 was actually measured using the contact type detection terminal 9 at time t during pouring, an error of Δh1 had occurred in the detected value of the eddy current type sensor 6. Therefore, this error △h
, was calculated by the control mechanism 8, and the value detected by the eddy current sensor 6 was revised upward.
この状態で注湯を継続すると、湯溜り部２の湯面７は更
に上昇した。そこで、湯面７が定常レベルに達した時点
ｔ２で、湯面７を接触型検出用端子９で再度実測した。When pouring was continued in this state, the hot water level 7 in the hot water pool 2 further rose. Therefore, at time t2 when the hot water level 7 reached a steady level, the hot water level 7 was measured again using the contact type detection terminal 9.
このとき、渦電流型センサー６の検出値に誤差Δｈ２が
生じていた。そこで、同様にして検出誤差△ｈ２に基づ
き、渦電流型センサー６による検出値を上方修正した。At this time, an error Δh2 occurred in the detected value of the eddy current sensor 6. Therefore, similarly, the value detected by the eddy current sensor 6 was revised upward based on the detection error Δh2.
更に、湯溜り部２の湯面７が定常状態になった段階で、
接触型検出用端子９により湯面レベルを周期的に検出し
た。そして、それぞれの検出時点１、．１４で検出され
た誤差△ｈ３、△ｈ４に基づいて、渦電流型センサー６
による検出値を上方あるいは下方に修正した。このよう
にして、湯面７を目標レベルに維持しながら溶鋼を注湯
し、薄肉鋳片を鋳造した。得られた薄肉鋳片は、鋳造の
全期間にわたって湯面７が目標レベルに保たれているた
め安定した条件下で鋳造されたものであり、肉厚不良、
ガス巻込み等の欠陥がない形状特性に優れたものであっ
た。Furthermore, at the stage when the hot water level 7 of the hot water pool portion 2 has reached a steady state,
The hot water level was periodically detected using a contact type detection terminal 9. Then, each detection time point 1, . Based on the errors △h3 and △h4 detected in 14, the eddy current sensor 6
The detected value was revised upward or downward. In this way, molten steel was poured while maintaining the molten metal level 7 at the target level, and a thin slab was cast. The obtained thin-walled slab was cast under stable conditions because the molten metal level 7 was maintained at the target level throughout the casting period, and there were no defects in wall thickness or
It had excellent shape characteristics with no defects such as gas entrainment.
なお、以上の例においては、異径双ロール方式の連続鋳
造機で説明した。しかし、本発明は、これに拘束される
ものではなく、注湯された溶融金属を急冷・凝固して薄
肉鋳片を製造するものである限り、他の双ロール方式、
単ドラム方式、単ベルト方式、双ベルト方式、ロール−
ベルト方式等の連続鋳造機に対しても同様に適用するこ
とができる。In the above example, a continuous casting machine with different diameter twin rolls was used. However, the present invention is not limited to this, and as long as the poured molten metal is rapidly cooled and solidified to produce a thin slab, other twin roll methods,
Single drum system, single belt system, double belt system, roll
It can be similarly applied to continuous casting machines such as belt type.
（発明の効果）
以上に説明したように、本発明においては、繰返し使用
可能な接触型検出用端子を基準点と接触点との間を移動
させ、その移動量から湯面レベルを実測している。そし
て、この実測値によって渦電流型センサーの検出値を補
正しているので、導通状態に基づいて湯面レベルを検出
する通電電極型センサーを使用した場合と異なり、定常
状態に達した湯面のレベルを継続的に実測することがで
き、鋳造期の湯面レベルを渦電流型センサーで粒度良く
把握することが可能となる。その結果、鋳造条件の制御
に対する信頼性が向上し、品質が優れ且つ一定した製品
を製造することができる。(Effects of the Invention) As explained above, in the present invention, the reusable contact type detection terminal is moved between the reference point and the contact point, and the hot water level is actually measured from the amount of movement. There is. Since the detected value of the eddy current type sensor is corrected using this actual measurement value, unlike when using a current-carrying electrode type sensor that detects the hot water level based on the conduction state, the hot water level reaches a steady state. The level can be measured continuously, and the molten metal level during the casting stage can be accurately determined using an eddy current sensor. As a result, reliability in controlling casting conditions is improved, and products of excellent and consistent quality can be manufactured.
第１図は本発明で使用する接触型検出用端子の作用を説
明するための図であり、第２図は鋳造空間を示す平面図
、第３図は本発明の効果を具体的に表したグラフ、第４
図は本発明者等が先に提案した通電電極型センサーを使
用した湯面レベル検出機構を備えた連続鋳造機の要部を
示す。
１ａ：小径上ロール １ｂ：大径下ロール２：湯溜
り部 ３：ノズル部４：注湯ノズル
５：通電電極型センサー６：渦電流型センサー ７：
湯面
８：制御機構 ９：接触型検出用端子１０ニ
スチツピングモータ
１１ｂ＝受光素子 １１ａ：発光素子１２：シー
ルド板 １１Ｃ：光路Ａ：基準点
Ｂ：接触点Fig. 1 is a diagram for explaining the action of the contact type detection terminal used in the present invention, Fig. 2 is a plan view showing the casting space, and Fig. 3 is a diagram specifically showing the effects of the present invention. graph, 4th
The figure shows the main parts of a continuous casting machine equipped with a molten metal level detection mechanism using a current-carrying electrode type sensor previously proposed by the present inventors. 1a: Small diameter upper roll 1b: Large diameter lower roll 2: Pool portion 3: Nozzle portion 4: Pouring nozzle
5: Current-carrying electrode type sensor 6: Eddy current type sensor 7:
Hot water surface 8: Control mechanism 9: Contact type detection terminal 10 Tipping motor 11b = Light receiving element 11a: Light emitting element 12: Shield plate 11C: Optical path A: Reference point
B: Contact point
Claims (1)
に注湯された溶融金属を前記冷却ロール及び／又はベル
トを介した抜熱により冷却・凝固し、薄肉鋳片を連続鋳
造する際、前記湯溜り部の上方に渦電流型センサーを配
置し、且つ接触型検出用端子を前記湯溜り部の上方に上
下動可能に配置し、基準点から前記湯溜り部の湯面に接
する位置まで下降する前記接触型検出用端子の移動量、
或いは前記湯溜り部の湯面に接した位置から前記基準点
まで上昇する前記接触型検出用端子の移動量を測定し、
該移動量に基づいて前記渦電流型センサーで検出された
測定値を補正することを特徴とする薄肉鋳片連続鋳造に
おける湯面レベル検出方法。1. When continuously casting thin slabs by cooling and solidifying the molten metal poured into a pool section divided by cooling rolls and/or belts by removing heat through the cooling rolls and/or belts, An eddy current type sensor is disposed above the hot water pool, and a contact type detection terminal is placed above the hot water pool so as to be movable up and down, from a reference point to a position where it touches the hot water surface of the hot water pool. the amount of movement of the contact-type detection terminal that descends;
Alternatively, measuring the amount of movement of the contact type detection terminal rising from a position in contact with the hot water surface of the hot water pool to the reference point,
A method for detecting a melt level in continuous casting of thin-walled slabs, characterized in that a measured value detected by the eddy current sensor is corrected based on the amount of movement.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1022530A JPH02205234A (en) | 1989-02-02 | 1989-02-02 | Method for detecting molten metal surface level in cast strip continuous casting |
| EP89121941A EP0380774B1 (en) | 1989-02-02 | 1989-11-28 | Method of and installation for regulating a liquid metal level in the pouring basin of continuous casting plants for strips |
| DE58908599T DE58908599D1 (en) | 1989-02-02 | 1989-11-28 | Process and device for regulating the level of the casting level in the casting room of a continuous strip caster. |
| AT89121941T ATE113510T1 (en) | 1989-02-02 | 1989-11-28 | METHOD AND EQUIPMENT FOR CONTROLLING THE HEIGHT OF THE CASTING LEVEL IN THE CASTING AREA OF A CONTINUOUS STRIP CASTING PLANT. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1022530A JPH02205234A (en) | 1989-02-02 | 1989-02-02 | Method for detecting molten metal surface level in cast strip continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02205234A true JPH02205234A (en) | 1990-08-15 |
| JPH0513747B2 JPH0513747B2 (en) | 1993-02-23 |
Family
ID=12085353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1022530A Granted JPH02205234A (en) | 1989-02-02 | 1989-02-02 | Method for detecting molten metal surface level in cast strip continuous casting |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0380774B1 (en) |
| JP (1) | JPH02205234A (en) |
| AT (1) | ATE113510T1 (en) |
| DE (1) | DE58908599D1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010146621A1 (en) * | 2009-06-15 | 2010-12-23 | 株式会社Ihi | Strip casting method and twin roll casting machine |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004090491A2 (en) * | 2003-03-31 | 2004-10-21 | Saudi Arabian Oil Company | Measurement of molten sulfur level in receptacles |
| CN111628625B (en) * | 2020-05-12 | 2021-12-10 | 中国科学技术大学 | Device for driving liquid metal liquid drops by light-controlled electric field |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3146360C2 (en) * | 1981-11-23 | 1983-10-27 | Wieland-Werke Ag, 7900 Ulm | Device for level control of the bath level in a continuous casting mold |
| DE3323749A1 (en) * | 1983-07-01 | 1985-01-03 | Norddeutsche Affinerie AG, 2000 Hamburg | METHOD FOR REGULATING THE BATH MIRROR LEVEL OF A METAL MELT |
| JPS60187455A (en) * | 1984-03-08 | 1985-09-24 | Kobe Steel Ltd | Detection of molten metal level in casting mold |
| EP0194327A1 (en) * | 1985-03-09 | 1986-09-17 | Fried. Krupp Gesellschaft mit beschränkter Haftung | Apparatus for regulating the position of the liquid metal level within a double belt continuous casting mould |
| US4728875A (en) * | 1986-10-20 | 1988-03-01 | Allegheny Ludlum Corporation | Method and apparatus for monitoring a liquid level |
-
1989
- 1989-02-02 JP JP1022530A patent/JPH02205234A/en active Granted
- 1989-11-28 AT AT89121941T patent/ATE113510T1/en not_active IP Right Cessation
- 1989-11-28 EP EP89121941A patent/EP0380774B1/en not_active Expired - Lifetime
- 1989-11-28 DE DE58908599T patent/DE58908599D1/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010146621A1 (en) * | 2009-06-15 | 2010-12-23 | 株式会社Ihi | Strip casting method and twin roll casting machine |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0380774B1 (en) | 1994-11-02 |
| EP0380774A2 (en) | 1990-08-08 |
| JPH0513747B2 (en) | 1993-02-23 |
| ATE113510T1 (en) | 1994-11-15 |
| DE58908599D1 (en) | 1994-12-08 |
| EP0380774A3 (en) | 1992-01-29 |
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