KR100306564B1 - Apparatus and method for controlling mould level in varying slab bulging - Google Patents
Apparatus and method for controlling mould level in varying slab bulging Download PDFInfo
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- KR100306564B1 KR100306564B1 KR1019990033999A KR19990033999A KR100306564B1 KR 100306564 B1 KR100306564 B1 KR 100306564B1 KR 1019990033999 A KR1019990033999 A KR 1019990033999A KR 19990033999 A KR19990033999 A KR 19990033999A KR 100306564 B1 KR100306564 B1 KR 100306564B1
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- level
- compensation
- mold
- steel
- amount
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 71
- 239000010959 steel Substances 0.000 claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 230000003247 decreasing effect Effects 0.000 claims abstract description 9
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 abstract description 4
- 230000007423 decrease Effects 0.000 description 6
- 238000007654 immersion Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000001976 improved effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Classifications
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- 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
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- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
- B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
Abstract
본 발명은 주편벌징에 의한 주형내 탕면레벨 제어장치 및 방법에 관한 것으로, 특히 측정되는 주편(10)의 벌징량 변화에 따라 제어기(18)에서 슬라이딩노즐(12)의 개도를 제어함으로써 주형(3)내의 탕면레벨을 조절하는 주편벌징에 의한 주형내 탕면레벨 제어장치에 있어서, 각 구동롤(4)에 설치되어 주편(10)의 벌징량변화에 따른 구동롤(4)의 토크를 측정하는 토크측정부(9)와; 상기 토크측정부(9)의 토크정보로부터 주형(3)내의 증가 또는 감소할 보상용강량을 산출하는 보상인자산출부(16)와; 상기 보상인자산출부(16)의 보상용강량을 레벨감지센서(7)의 용강레벨로부터 증감시켜 보상용강레벨을 구하고, 이 보상용강레벨과 설정용강레벨을 비교 산출한 보상편차를 상기 제어부(18)로 전송하는 비교연산부(17)로 구성되는 것을 특징으로 하는 주편벌징에 의한 주형내 탕면레벨 제어장치에 관한 것이다.The present invention relates to an apparatus and method for controlling the level of in-mold by slab bulging, and in particular, by controlling the opening degree of the sliding nozzle 12 in the controller 18 according to the change in the bulging amount of the slab 10 to be measured. In the mold level control device in the mold by the slab bulging to adjust the level of the molten metal in the), the torque is installed on each drive roll 4 to measure the torque of the drive roll (4) according to the change in the bulging amount of the slab (10) Measuring section 9; A compensation person asset output unit (16) for calculating the amount of compensation steel to be increased or decreased in the mold (3) from the torque information of the torque measuring unit (9); The compensation steel level is increased or decreased from the molten steel level of the level detecting sensor 7 to obtain the compensation steel level, and the controller 18 calculates a compensation deviation obtained by comparing the compensation steel level with the set steel level. It relates to an in-mold mold level control device by the slab bulging, characterized in that it comprises a comparison operation unit 17 for transmitting to.
또한, 본 발명은 토크측정부(9)에서 주편(10)의 벌징량변화에 따른 구동롤(4)의 토크변화를 검출하는 단계와; 보상인자산출부(16)에서 상기 토크측정부(9)의 토크정보부터 보상용강량을 산출하는 단계와; 비교연산부(17)에서 상기 보상인자산출부(16)의 보상용강량을 레벨감지센서(7)의 용강레벨로부터 증감하여 보상용강레벨을 구하고, 이 보상용강레벨과 설정용강레벨을 비교하여 편차를 구하는 단계와; 상기 비교연산부(17)에서 산출된 보상편차에 따라 제어부(18)에서 슬라이딩노즐(12)의 개도를 제어하여 주형(3)에 주입되는 용강량을 조절하는 단계로 구성되는 것을 특징으로 하는 주편벌징에 의한 주형내 탕면레벨 제어방법에 관한 것이다.In addition, the present invention comprises the steps of detecting the torque change of the drive roll (4) in accordance with the bulging amount of the slab 10 in the torque measuring unit (9); Calculating an amount of compensation steel from the torque information of the torque measuring unit (9) in the compensation person asset output unit (16); The comparison calculation unit 17 obtains the compensation steel level by increasing or decreasing the compensation steel amount of the compensation person asset output unit 16 from the molten steel level of the level sensing sensor 7, and compares the compensation steel level with the set steel level to determine the deviation. Obtaining; Cast molten steel, characterized in that for controlling the amount of molten steel injected into the mold 3 by controlling the opening degree of the sliding nozzle 12 in the control unit 18 according to the compensation deviation calculated by the comparison operation unit 17 The present invention relates to a method for controlling the in-mold level of water by using a mold.
Description
본 발명은 주편벌징에 의한 주형내 탕면레벨 제어장치 및 방법에 관한 것으로, 특히 연속주조설비에 있어 주편을 구동하는 구동롤의 토크를 측정하여 주편의 벌징량을 산출하고, 산출된 벌징량을 전향보상인자로 활용함으로써 주형내의 탕면레벨을 보다 정확하게 제어할 수 있는 주편벌징에 의한 주형내 탕면레벨 제어장치 및 방법에 관한 것이다.The present invention relates to an apparatus and method for controlling the in-mold level of the mold by slab bulging, and particularly, in a continuous casting facility, by measuring the torque of a driving roll for driving the slab, calculating the bulging amount of the slab, and converting the calculated bulging amount. The present invention relates to an apparatus and method for controlling the level of molten metal in the mold by slab bulging, which can more accurately control the level of molten metal in the mold.
종래의 주형내 탕면레벨 제어장치 및 방법은 도1에 도시한 바와같이 레벨감지센서(7)에서 주형(3)내의 탕면레벨을 측정하여 비교연산부(14)에 전송하게 되면 비교연산부에서 설정탕면레벨과 비교하여 그 편차를 구하게 된다.In the conventional mold level control apparatus and method in the mold, as shown in FIG. 1, when the level sensor 7 measures the level of the water level in the mold 3 and transmits the level to the comparison operation unit 14, the level setting level is set in the comparison operation unit. The deviation is obtained by comparing with.
그리고, 비교연산부(14)에서 산출된 탕면레벨편차에 따라 제어부(11)에서 슬라이딩노즐(12)의 개도를 제어하여 침지노즐(8)로 주입되는 용강량을 조절하게 된다.Then, the controller 11 controls the opening degree of the sliding nozzle 12 to adjust the amount of molten steel injected into the immersion nozzle 8 according to the level of the water level calculated by the comparison operation unit 14.
이때, 구동롤(4)과 가이드롤(5)을 따라 진행되는 주편(10)의 벌징(Bulging)(6)에 변화가 발생되면 주형(3)내의 탕면레벨이 심하게 변동되고, 이로인해 용강(2)이 주형을 오버플로(Overflow)하거나 주형내 주편의 응고셀이 찢어지면서 용강이 응고셀 밖으로 흘러나오는 블랙아웃(Blackout) 등이 발생되어 주편의 품질에 악영향을 미치게 된다.At this time, if a change occurs in the bulging 6 of the slab 10 traveling along the driving roll 4 and the guide roll 5, the level of the water in the mold 3 is severely changed, which causes the molten steel ( 2) Overflow of the mold or tearing of the solidification cell of the cast in the mold causes blackout of molten steel flowing out of the solidification cell, which adversely affects the quality of the casting.
따라서, 이러한 주편(10)의 벌징(6)의 크기변화에 따른 주형(3)내의 탕면레벨변동을 제어하기 위하여 도2에 도시한 바와같이 벌징량측정장치(15)로부터 최대벌징량개소가 검출되어 벌징량산출부(13)에 입력되면 벌징량산출부에서 주편의 벌징량을 산출하여 비교연산부(14-1)로 전송하게 된다.Accordingly, the maximum bulging amount is detected from the bulging amount measuring device 15 as shown in FIG. 2 in order to control the level of water level in the mold 3 according to the size change of the bulging 6 of the slab 10. When the bulge amount calculation unit 13 is input, the bulge amount calculation unit calculates the bulge amount of the cast steel and transmits it to the comparison operation unit 14-1.
그리고, 비교연산부(14-1)에서는 벌징량산출부(13)에서 산출된 주편(10)의 벌징량변화를 레벨감지센서(7)에서 측정된 용강레벨에 반영하여 설정용강레벨과의 편차를 산출하고, 다시 레벨편차에 의해 제어부(11-1)에서 슬라이딩노즐(12)의 개도를 제어하여 외란으로 작용하는 주편의 벌징량변동에 의한 탕면레벨을 제어하게 된다.In addition, the comparison operation unit 14-1 reflects the bulging amount change of the slab 10 calculated by the bulging amount calculation unit 13 in the molten steel level measured by the level sensor 7 to determine the deviation from the set steel level. It calculates and again controls the opening degree of the sliding nozzle 12 by a level deviation, and controls the water level level by fluctuation of the bulging amount of the slab which acts as a disturbance.
그러나, 롤(4,5) 사이에 설치되는 주편벌징측정장치(15)는 그 설치장소가 비좁아 취부 및 취외작업이 매우 까다롭고, 고온다습한 환경에 의해 자주 고장이 발생되어 주편(10)의 벌징량을 정확히 측정할 수 없게 되는 문제점이 있다.However, the slab bulging measuring device 15 installed between the rolls 4 and 5 is very difficult to install and take out due to its narrow installation place, and frequent failure occurs due to a high temperature and high humidity environment. There is a problem in that the bulging amount cannot be accurately measured.
본 발명은 연속주조설비에 있어 주편을 구동하는 구동롤의 토크를 측정하여 주편의 벌징량을 산출하고, 산출된 벌징량을 전향보상인자로 활용함으로써 주형내의 탕면레벨을 보다 정확하게 제어할 수 있는 주편벌징에 의한 주형내 탕면레벨 제어장치 및 방법을 제공함에 그 목적이 있다.The present invention is to measure the torque of the drive roll for driving the cast steel in the continuous casting equipment to calculate the bulging amount of the cast, and by using the calculated bulging amount as a forward compensation factor cast steel that can more accurately control the water level in the mold It is an object of the present invention to provide an apparatus and method for controlling the level of water in the mold by bulging.
도1은 종래의 주편벌징에 의한 주형내 탕면레벨 제어장치를 나타내는 블록선도,1 is a block diagram showing a mold level control apparatus in a mold by conventional slab bulging;
도2는 종래의 주편벌징에 의한 주형내 탕면레벨 제어장치를 나타내는 블록선도,2 is a block diagram showing a mold level control apparatus in a mold by conventional slab bulging;
도3은 본 발명에 따른 주편벌징에 의한 주형내 탕면레벨 제어장치를 나타내는 블록선도,Fig. 3 is a block diagram showing an in-mold level control apparatus for in-mold by slab bulging according to the present invention;
도4는 본 발명에 따른 주편벌징에 의한 주형내 탕면레벨 제어방법을 나타내는 순서도이다.Figure 4 is a flow chart showing a method for controlling the level of water in the mold by the slab bulging according to the present invention.
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
1: 턴디쉬 2: 용강 3: 주형 4: 구동롤 5: 가이드롤 6: 벌징 7: 레벨감지센서 8: 침지노즐 9: 토크측정부 10: 주편 11,11-1: 제어부 12: 슬라이딩노즐 13: 벌징량산출부DESCRIPTION OF SYMBOLS 1: Tundish 2: Molten steel 3: Mold 4: Driving roll 5: Guide roll 6: Bulging 7: Level sensor 8: Immersion nozzle 9: Torque measuring part 10: Casting 11, 11-1: Control part 12: Sliding nozzle 13 : Punishing quantity calculation unit
상기한 목적을 달성하기 위하여 본 발명은 측정되는 주편의 벌징량 변화에 따라 제어기에서 슬라이딩노즐의 개도를 제어함으로써 주형내의 탕면레벨을 조절하는 주편벌징에 의한 주형내 탕면레벨 제어장치에 있어서, 각 구동롤에 설치되어 주편의 벌징량변화에 따른 구동롤의 토크를 측정하는 토크측정부와; 상기 토크측정부의 토크정보로부터 주형내의 증가 또는 감소할 보상용강량을 산출하는 보상인자산출부와; 상기 보상인자산출부의 보상용강량을 레벨감지센서의 용강레벨로부터 증감시켜 보상용강레벨을 구하고, 이 보상용강레벨과 설정용강레벨을 비교 산출한 보상편차를 상기 제어부로 전송하는 비교연산부로 구성되는 것을 특징으로 하는 주편벌징에 의한 주형내 탕면레벨 제어장치를 제공한다.In order to achieve the above object, the present invention provides a mold level control device in a mold by bulging the molten metal in the mold by controlling the opening degree of the sliding nozzle in the controller according to the change in the bulging amount of the cast steel, each driving A torque measuring unit installed on the roll to measure torque of the driving roll according to the bulging amount of the cast steel; A compensation person asset outputting unit for calculating the amount of compensation steel to be increased or decreased in the mold from the torque information of the torque measuring unit; And a compensating unit for increasing the compensating steel quantity of the compensator asset output from the molten steel level of the level sensing sensor to obtain a compensating steel level, and transmitting the compensating deviation obtained by comparing the compensating steel level with the set steel level to the controller. Provided is a mold level control device in a mold by slab bulging characterized in that.
또한, 본 발명은 토크측정부에서 주편의 벌징량변화에 따른 구동롤의 토크변화를 검출하는 단계와; 보상인자산출부에서 상기 토크측정부의 토크정보부터 보상용강량을 산출하는 단계와; 비교연산부에서 상기 보상인자산출부의 보상용강량을 레벨감지센서의 용강레벨로부터 증감하여 보상용강레벨을 구하고, 이 보상용강레벨과 설정용강레벨을 비교하여 편차를 구하는 단계와; 상기 비교연산부에서 산출된 보상편차에 따라 제어부에서 슬라이딩노즐의 개도를 제어하여 주형에 주입되는 용강량을 조절하는 단계로 구성되는 것을 특징으로 하는 주편벌징에 의한 주형내 탕면레벨 제어방법을 제공한다.In addition, the present invention comprises the steps of detecting the torque change of the drive roll according to the change in the bulging amount of the cast steel in the torque measuring unit; Calculating a compensating steel quantity from the torque information of the torque measuring unit in the compensator asset outputting unit; Obtaining a compensation steel level by increasing / decreasing the compensation steel amount of the compensation person asset exiting part from the molten steel level of a level detecting sensor, and comparing the compensation steel level with a set steel level to obtain a deviation; And controlling the amount of molten steel injected into the mold by controlling the opening degree of the sliding nozzle in the control unit according to the compensation deviation calculated by the comparison operation unit.
도면을 참조하여 본 발명의 구성을 설명한다.The configuration of the present invention will be described with reference to the drawings.
도3은 본 발명에 따른 주편벌징에 의한 주형내 탕면레벨 제어장치를 나타내는 블록선도이고, 도4는 본 발명에 따른 주편벌징에 의한 주형내 탕면레벨 제어방법을 나타내는 순서도이다.Fig. 3 is a block diagram showing an in-mold weeping level control apparatus by slab bulging according to the present invention.
본 발명의 토크측정부(9)는 각 구동롤(4)에 설치되어 주편(10)의 벌징량변화에 따른 구동롤의 토크(Torque)를 측정하게 된다.Torque measuring unit 9 of the present invention is installed on each drive roll (4) to measure the torque (Torque) of the drive roll according to the bulging amount change of the slab (10).
그리고, 각 구동롤(4)의 토크를 측정하는 토크측정부(9)는 그 토크정보를 보상인자산출부(16)에 전송하게 되고, 보상인자산출부에서는 토크측정부의 토크정보를 하기의 식을 이용하여 주형(3)내의 증가 또는 감소할 용강량을 산출해내게 된다.Then, the torque measuring unit 9 for measuring the torque of each drive roll (4) transmits the torque information to the compensator asset outlet 16, the compensator asset outlet is the torque information of the torque measuring unit in the following equation Calculate the amount of molten steel to increase or decrease in the mold (3).
즉, 보상인자산출부(16)에서는 토크측정부(9)에서 측정되는 구동롤(4)의 토크가 상승되면 벌징(6)의 양이 증가하여 용강(2)의 레벨이 하강하는 것으로 판단함으로써 증가할 보상용강량을 산출하게 된다.That is, when the torque of the drive roll 4 measured by the torque measuring unit 9 is increased in the compensation asset asset output unit 16, the amount of the bulging 6 is increased to determine that the level of the molten steel 2 is lowered. The amount of compensation steel to be increased is calculated.
그러나, 보상인자산출부(16)에서는 토크측정부(9)에서 측정되는 구동롤(4)의 토크가 하강되면 벌징(6)의 양이 감소하여 용강(2)의 레벨이 상승하는 것으로 판단함으로써 감소할 보상용강량을 산출하게 된다.However, in the compensator asset output section 16, when the torque of the driving roll 4 measured by the torque measuring section 9 decreases, the amount of the bulging 6 decreases, so that the level of the molten steel 2 rises. The amount of compensation steel to be reduced is calculated.
또한, 비교연산부(17)에서는 보상인자산출부(16)에서 전송되는 주편(10)의 벌징량에 따른 보상용강량을 전향보상인자로 활용하여 레벨감지센서(7)에서 검출되는 현재의 용강레벨로부터 증감시킨 후, 설정용강레벨과 비교하게 된다.In addition, the comparison operation unit 17 utilizes the compensation steel amount according to the bulging amount of the slab 10 transmitted from the compensator asset exit 16 as a forward compensation factor, and the current molten steel level detected by the level sensor 7. After increasing / decreasing from, it is compared with the set steel level.
이때, 비교연산부(17)에서는 용강레벨편차값을 제어부(18)로 전송하게 되고, 이 제어부에서는 슬라이딩노즐(12)의 개도율을 조절하여 침지노즐(8)을 통한 용강의 주입량을 미리 조절하게 된다.In this case, the comparison operation unit 17 transmits the molten steel level deviation value to the control unit 18, and in this control unit, the injection amount of the molten steel through the immersion nozzle 8 is adjusted in advance by adjusting the opening ratio of the sliding nozzle 12. do.
이하, 본 발명의 작용을 설명한다.The operation of the present invention will be described below.
주조중 레벨감지센서(7)에서 주형(3) 내의 용강(2)의 레벨을 검출하여 비교연산부(17)에 전송하게 되고, 주편(10)의 벌징량 변화가 없는 경우 비교연산부(9-1)에서는 레벨감지센서(7)의 용강레벨과 설정용강레벨을 비교하여 편차를 산출하게 된다.The level sensor 7 during casting detects the level of the molten steel 2 in the mold 3 and transmits it to the comparison calculation unit 17. When there is no change in the bulging amount of the cast 10, the comparison calculation unit 9-1 ) Calculates a deviation by comparing the molten steel level of the level sensor 7 with the set molten steel level.
그리고, 제어부(18)에서는 비교연산부(17)에서 산출된 용강레벨편차에 의해 슬라이딩노즐(12)의 개도를 제어하여 침지노즐(8)를 통해 주형(3)에 주입되는 용강량을 제어하게 된다.The controller 18 controls the opening degree of the sliding nozzle 12 by the molten steel level deviation calculated by the comparison operation unit 17 to control the amount of molten steel injected into the mold 3 through the immersion nozzle 8. .
그러나, 주편(10)의 벌징량 변화가 발생되면 토크측정부(9)에서 구동롤(4)의 토크를 측정하게 되고, 토크측정부(9)에서는 상승 또는 하강되는 구동롤의 토크변화량을 검출하여 보상인자산출부(16)로 전송하게 된다.However, when a change in the bulging amount of the slab 10 occurs, the torque measuring unit 9 measures the torque of the driving roll 4, and the torque measuring unit 9 detects the torque change amount of the driving roll that is raised or lowered. To be sent to the compensation asset asset 16.
이때, 보상인자산출부(16)에서는 토크가 상승되면 벌징량의 증가에 의해 용강(2)의 레벨이 하강하는 것으로 판단하여 증가할 보상용강량을 산출하게 되고, 토크가 하강되면 벌징량의 감소에 의해 용강(2)의 레벨이 상승하는 것으로 판단하여 감소할 보상용강량을 산출하게 된다.At this time, the compensator asset output unit 16 determines that the level of the molten steel 2 decreases by increasing the bulging amount when the torque is increased, and calculates the amount of compensation steel to be increased, and decreases the bulging amount when the torque is lowered. It is determined that the level of the molten steel (2) is increased by to calculate the amount of compensation molten steel to be reduced.
여기서, 비교연산부(17)에서는 보상인자산출부(16)에서 전송되는 주편(10)의 벌징량에 따른 보상용강량을 레벨감지센서(7)에서 검출되는 현재의 용강레벨로부터 증감시킨 후, 설정용강레벨과 비교하여 보상편차를 구하게 된다.Here, the comparison operation unit 17 increases and decreases the compensation steel amount according to the bulging amount of the slab 10 transmitted from the compensator asset output unit 16 from the current molten steel level detected by the level detecting sensor 7, and then sets it. Compensation deviation is obtained by comparing with molten steel level.
그리고, 제어부(18)에서는 비교연산부(17)에서 전송된 보상편차에 의해 슬라이딩노즐(12)의 개도율을 조절하여 침지노즐(8)을 통한 용강의 주입량을 미리 조절하게 된다.In addition, the controller 18 adjusts the amount of opening of the molten steel through the immersion nozzle 8 in advance by adjusting the opening ratio of the sliding nozzle 12 by the compensation deviation transmitted from the comparison operation unit 17.
본 발명은 구동롤의 토크변화량으로부터 주편의 벌징량변화를 산출함으로써 주형내의 용강레벨을 보다 정확히 제어할 수 있고, 토크측정부의 경우 벌징량을 직접 측정하는 종래의 벌징측정장치에 비해 정비의 효율이 향상되는 효과를 제공하게된다.The present invention can more accurately control the molten steel level in the mold by calculating the change in the bulging amount of the cast from the torque change amount of the drive roll, the torque measuring unit is more efficient in maintenance than the conventional bulging measuring device which directly measures the bulging amount. Will provide an improved effect.
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| KR1019990033999A KR100306564B1 (en) | 1999-08-17 | 1999-08-17 | Apparatus and method for controlling mould level in varying slab bulging |
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