KR930006638B1 - Continuous casting of steel - Google Patents
Continuous casting of steel Download PDFInfo
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- KR930006638B1 KR930006638B1 KR1019910024841A KR910024841A KR930006638B1 KR 930006638 B1 KR930006638 B1 KR 930006638B1 KR 1019910024841 A KR1019910024841 A KR 1019910024841A KR 910024841 A KR910024841 A KR 910024841A KR 930006638 B1 KR930006638 B1 KR 930006638B1
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- tundish
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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
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- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
제1도는 본 발명의 하드웨어 구성도.1 is a hardware configuration of the present invention.
제2도는 본 발명을 설명하기위한 연속주조 설비의 개략도.2 is a schematic diagram of a continuous casting plant for explaining the present invention.
제3도는 본 발명에 따른 주조개시시의 주조 폭별 주조시간별 주조속도 증속 테이블.3 is a casting speed increase table for each casting time by casting width at the start of casting according to the present invention.
제4도는 본 발명에 따른 턴디쉬 교환시의 주조폭별 턴디쉬내 용강량별 주조속도 감속테이블.4 is a casting speed reduction table for each molten steel in the tundish for each casting width during the tundish exchange according to the present invention.
제5도는 본 발명에 다른 주조완료시의 주조폭별 턴디쉬내 잔여 용강량별 주조속도 감속테이블5 is a casting speed reduction table according to the remaining molten steel in the tundish by casting width at the completion of casting according to the present invention
제6도는 본 발명에 따른 주편인발시 주편말단부의 위치별 주조폭별 주조속도 증속테이블.6 is a casting speed increasing table according to the casting width for each position of the cast slab end portion according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
11 : 전기콤퓨터 12 : 계장콤퓨터11: electric computer 12: instrumentation computer
13 : 작업조건입력부 14 : 모올드 용강 제어부13: working condition input part 14: molten molten steel control part
15 : 턴디쉬 16 : 용강제어장치15: tundish 16: molten steel control device
17 : 용강 18 : 모올드17: molten steel 18: Moold
19 : 용강높이 센서19: molten steel height sensor
본 발명은 강의 연속주조 작업 제어방법에 관한것으로 특히 주조작업의 초기와 말기의 작업조건에 따라 주조속도를 자동 제어함으로써 작업자의 목측에 의한 주조작업속도 편차를 제거하여 주편의 품질개선과 말주편의 수축율 최소화에 따른 실수율 향상효과를 얻을수 있는 강의 연속주조 자동제어방법에 관한 것이다.The present invention relates to a method of controlling continuous casting work of steel, in particular, by automatically controlling the casting speed according to the working conditions at the beginning and the end of the casting work, eliminating the variation in casting work speed due to the operator's neck, thereby improving the quality of the cast steel and shrinkage of the cast steel. The present invention relates to an automatic control method for continuous casting of steel that can improve the error rate due to minimization.
강의 연속주조 작업에서는 주조초기 및 말기 조업에서 모올드내의 용강면안정을 위해 용강제어장치와 주조속도를 제한하고 모올드 파우더를 투입하고 턴디쉬내에 일정량의 용강량을 확보하고 주조속도를 제어하는등 말주편 품질확보 및 실수율 향상을 위한 일련의 제어작업이 동시 다발적으로 요구된다.In the continuous casting operation of steel, in order to stabilize the molten steel in the mould during the initial and final stages of casting, the molten steel control device and the casting speed are limited, the mould powder is injected, the molten steel is secured in the tundish and the casting speed is controlled. A series of control tasks are required at the same time to ensure the quality of the cast and improve the error rate.
따라서 연속주조 조업을 위한 작업인원 설정시 다수의 인원부담과 비효율적인 조업제어가 큰 문제점으로 나타나게된다.Therefore, a large number of personnel burden and inefficient operation control appear to be a big problem when setting up the workforce for continuous casting operation.
특히 주조초기 및 말기에 생산된 주편은 작업의 불안정성과 과도한 주조속도 변동에따라 모올드내의 용강면이 불안정해져 모올드 파우어성 개재물 및 가공성 결함이 주편과 코일의 표면에 표출되어 표면품질의 열화를 가져오게 되고, 주조말기 주편의 과도한 냉각과 주편인발시의 주조속도의 부적절한 증속으로 인하여 주편내 수축길이의 증가에 따른 실수율 저하 및 기계적 성질 저하를 초래하게 된다.In particular, cast steel produced at the beginning and end of casting is unstable due to work instability and excessive casting speed fluctuations, resulting in deterioration of surface quality due to the appearance of mould powder inclusions and workability defects on the surface of cast steel and coil. In addition, due to excessive cooling of the end-casting slab and inadequate increase in casting speed during the casting of the slab, the error rate decreases and the mechanical properties decrease due to the increase in the shrinkage length in the slab.
본 발명은 기존의 연속주조 작업에서 특히 문제가되는 주조 초기 및 말기의 주조속도를 용강면의 높이에 따라 적절히 제한함으로써 고품위의 주편을 얻을수 있는 강의 연속 주조 자동제어 방법을 제안한다.The present invention proposes an automatic control method for continuous casting of steel that can obtain high quality cast steel by appropriately limiting the casting speed of the initial and end castings, which are particularly problematic in conventional continuous casting operations, depending on the height of the molten steel surface.
이하 첨부된 도면에 따라 본 발명을 설명하면 다음과 같다.Hereinafter, the present invention will be described with reference to the accompanying drawings.
제1도는 본 발명의 하드웨어적 구성도로써, 전기 콤퓨터(11)에는 외부에서 입력되는 작업조건에 대한 정보가 작업조건 설정부(13)에서 입력되게 구성하고 또한 용강면 높이센서(19)의 센싱 입력데이터를 포함하는 계장콤퓨터(12)의 연속주조제어 경보가 입력되게 구성한다.1 is a hardware configuration diagram of the present invention, the electric computer 11 is configured so that the information on the working condition input from the outside is input from the working condition setting unit 13 and the sensing of the molten steel height sensor 19 The continuous casting control alarm of the instrumentation computer 12 including the input data is configured to be input.
상기 전기 콤퓨터(11)는 입력되는 모든 데이터에 기초하여 모울드 용강제어부(14)에 제어신호를 제공하게 구성한다.The electric computer 11 is configured to provide a control signal to the molten steel control unit 14 on the basis of all input data.
제2도는 연속주조장치의 개략도로써, 턴디쉬(15)의 용강은 용강제어장치(16)에 의해서, 일정폭으로 개공된 모울드(18)내의 투입되게 되며, 이때 모올드내의 용강(17)의 제1-제5높이(h1-h5)는 용강높이센서(19)에 의해 검지되어 계장콤퓨터(12)로 그 검지신호를 내보내게 된다.2 is a schematic diagram of a continuous casting apparatus, wherein the molten steel of the tundish 15 is introduced into the mold 18 opened by the molten steel control device 16 in a predetermined width, wherein the molten steel 17 in the mold is The first to fifth heights h 1 to h 5 are detected by the molten steel height sensor 19 to send the detection signal to the instrumentation computer 12.
본 발명의 연속주조제어 방법은 자동주조개시 턴디쉬 교환전 자동주조완료, 자동주조 완료의 조업조건별로 외부 작업조건 입력부(13)에 따라 구분제어된다.Continuous casting control method of the present invention is controlled separately according to the external working condition input unit 13 for each operation condition of automatic casting completion, automatic casting completion before the tundish exchange at the time of automatic casting start.
먼저 작업조건 입력부(13)에서 자동주조개시를 입력하면, 처음 모올드 용강제어장치(16)의 개공도가 주조폭에따라 30-50% 열려진 상태에서 턴디쉬(15)에 래들로부터 용강이 주입되어 용강(17)이 모올드(18)내로 주입된다.First, when the automatic casting start is input from the working condition input unit 13, molten steel is injected from the ladle into the tundish 15 while the opening degree of the molten molten steel control device 16 is opened 30-50% according to the casting width. The molten steel 17 is injected into the mould 18.
용강면이 제1용강높이(h1)에 도달하면 용강높이센서(19)에 의해 용강면을 감지 하기 시작하여 이를 계장콤퓨터(12)에 전달하게된다.When the molten steel reaches the first molten steel height h 1 , the molten steel height sensor 19 starts to detect the molten steel surface and transmits it to the instrumentation computer 12.
용강면이 파우더투입개시 높이인 제3높이(h3)에 이루면 계장 콤퓨터(12)는 모올드파우더투입개시 신호를 전기 콤퓨터(11)에 전송하고 전기콤퓨터(11)는 파우더 투입기(도시생략)가 파우더를 투입개시하도록 제어한다.When the molten steel surface reaches the third height (h 3 ), which is the powder injection start height, the instrumentation computer 12 transmits a mould powder injection start signal to the electric computer 11, and the electric computer 11 is a powder input machine (not shown). Control to start loading the powder.
용강면이 주조개시높이인 제4높이(h4)에 이르면 주조속도는 제3도의 주조폭별, 주조시간별, 주조속도별 증속테이블에 따라 자동제어된다.When the molten steel reaches the fourth height h 4 , which is the casting start height, the casting speed is automatically controlled according to the speed increasing table for each casting width, casting time, and casting speed in FIG. 3.
이후 용강면이 설정높이인 제5높이(h5)에 이르면 모울드(18)내의 용강면은 계장콤퓨터(12)의 전기콤퓨터(11)에 의해 자동 조절된다.Then, when the molten steel reaches the fifth height h 5 , which is the set height, the molten steel in the mold 18 is automatically adjusted by the electric computer 11 of the instrumentation computer 12.
이에 앞서 제3도의 테이블은 주조될 주편크기에 따른 용강제어장치에서의 용강유속(kg/m)과 더미바(Dummy Bar)와 계장 콤퓨터(12)에 용강높이 센싱 신호를 제공하는 용강높이 센서(19)가 용강을 최초로감지 가능한 제1높이(h1)에서부터 설정높이인 제5높이(h6)를 센싱하는 데까지 걸리는 시간, 즉 용강 채움시간(약 1분)을 고려하면 결정된다. 또 이 테이블에서 최종 주조속도는 주조폭별 허용 최대주조 속도로 결정된다.Prior to this, the table of FIG. 3 is a molten steel sensor for providing molten steel height sensing signals to the molten steel flow rate (kg / m), the dummy bar, and the instrumentation computer 12 according to the size of the cast steel to be cast ( 19 is determined by considering the time taken for sensing the molten steel for the first time from the first height h 1 to the fifth height h 6 , the set height, that is, the molten steel filling time (about 1 minute). The final casting speed in this table is also determined by the maximum casting speed allowed for each casting width.
한편 턴디쉬 교환전 자동 주조 완료는 턴디쉬 교환작업중 주조중인 턴디쉬의 주조말기시 주조속도를 제어하게된다. 이는 작업조건 입력부(13)에 입력되는 외부 키버튼에 의해 실행된다.On the other hand, the completion of automatic casting before the tundish exchange control the casting speed at the end of the casting of the tundish being cast during the tundish exchange operation. This is executed by an external key button input to the work condition input unit 13.
이때의 주조속도는 제4도에서 도시하고 있는 바와같이 주조폭별, 턴디쉬내 용강량별로 자동제어되는데, 후속 턴디쉬 주조초기 조건을 확보해야하기 때문에 턴디쉬 교환시 말기 주조속도를 "0"을 유지할 필요가 있어 제5도의 주조말기 주조제어 속도제어 테이블과는 다소 상이한 별도의 테이블로 관리한다.At this time, the casting speed is automatically controlled for each casting width and molten steel in the tundish, as shown in FIG. 4. Since the initial tundish casting conditions must be secured, the final casting speed at the time of tundish change is "0". Since it is necessary to maintain this, it is managed by a separate table somewhat different from the end casting control speed control table of FIG.
턴디쉬 교환후의 주조개시는 주조초기의 자동주조 개시와 동일한 방법으로 제어한다.The casting start after the tundish replacement is controlled in the same manner as the automatic casting start of the initial casting.
다음 자동주조완료는 주조말기시에 주편 인발 작업을 포함한 주조속도를 자동 제어 하게 된다. 이는 작업 조건 입력부(13)에 외부에서 입력되는 자동주조완료 키 버튼에 의해서 제5도에서 도시하고 있는 바와같은 주조폭별 턴디쉬내 잔여 용강량에 따라 자동제어 되는데, 턴디쉬내 잔여용강량이 최종값에 도달하면 모올드 용강장치(16)가 폐쇄되고 모올드내 용강면 자동제어 기능이 정지된다. 이후 모올드(18)내 용강(17)이 용강면 제2높이(h2)에 이르면 연속주조조업을 주편 인발 모드로 자동절환되고 그 주조 속도는 제6도의 주조폭별, 말주편 말단부 위치에 따라 자동 제어된다.The next automatic casting completion will automatically control the casting speed including the casting drawing operation at the end of casting. This is automatically controlled according to the remaining molten steel in the tundish for each casting width as shown in FIG. 5 by the automatic casting completion key button input to the working condition input unit 13 from the outside. When the value is reached, the molten molten steel device 16 is closed and the molten steel surface automatic control function is stopped. After the molten steel 17 in the molde 18 reaches the molten steel surface second height (h 2 ), the continuous casting operation is automatically switched to the casting drawing mode, and the casting speed is at the end position of the end of the cast iron according to the casting width of FIG. It is automatically controlled accordingly.
한편, 제5도의 주조속도 테이블은 턴디쉬내 잔여 용강 최소화와 주조말기용강 채움시간 확보를 통한 말주편의 품질을 안정하게 유도하게되며 말주편 수축율을 최소화시키게 된다.On the other hand, the casting speed table of FIG. 5 induces stable cast iron quality by minimizing remaining molten steel in the tundish and securing filling time for the end-cast steel, and minimizes shrinkage of the cast iron.
또, 제6도의 주조속도 테이블은 말주편 수축을 감소를 위해 신속히 정상 주조 속도에 도달하게 됨을 보이고 있다.In addition, the casting speed table of FIG. 6 shows that the casting speed table quickly reaches the normal casting speed to reduce the shrinkage of the cast iron.
이상에서 설명한 바와같은 본 발명은 연속주조 현장에서 조업조건, 예를들면 주조초기, 턴디쉬교환시기, 주조말기 조건에 따라 주조속도를 자동제어하게 되므로 작업인원의 감축과 작업표준화를 통한 주편 초기 및 말단부 품질 안정화와 말주편 수축율감소에 다른 실수율향상을 꾀할 수 있다.As described above, the present invention automatically controls the casting speed according to the operating conditions, for example, the beginning of casting, the time of the tundish change, and the end of the casting, in the continuous casting site. Other real rate improvement can be achieved for stabilization of end quality and reduction of shrinkage of cast iron.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019910024841A KR930006638B1 (en) | 1991-12-28 | 1991-12-28 | Continuous casting of steel |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019910024841A KR930006638B1 (en) | 1991-12-28 | 1991-12-28 | Continuous casting of steel |
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| KR930012147A KR930012147A (en) | 1993-07-20 |
| KR930006638B1 true KR930006638B1 (en) | 1993-07-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100977781B1 (en) * | 2007-09-28 | 2010-08-24 | 주식회사 포스코 | Initial casting method for stable casting in twin roll strip casting |
| EP1536900B2 (en) † | 2002-09-12 | 2012-08-15 | Siemens VAI Metals Technologies GmbH | Method for commencing a casting process |
| EP1784520B2 (en) † | 2004-07-13 | 2017-05-17 | Abb Ab | A device and a method for stabilizing a metallic object |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101243120B1 (en) * | 2009-12-16 | 2013-03-12 | 주식회사 포스코 | An apparatus and method for preventing strip breakage of startup procedure in twin roll strip casting process |
-
1991
- 1991-12-28 KR KR1019910024841A patent/KR930006638B1/en not_active IP Right Cessation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1536900B2 (en) † | 2002-09-12 | 2012-08-15 | Siemens VAI Metals Technologies GmbH | Method for commencing a casting process |
| EP1784520B2 (en) † | 2004-07-13 | 2017-05-17 | Abb Ab | A device and a method for stabilizing a metallic object |
| KR100977781B1 (en) * | 2007-09-28 | 2010-08-24 | 주식회사 포스코 | Initial casting method for stable casting in twin roll strip casting |
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| Publication number | Publication date |
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| KR930012147A (en) | 1993-07-20 |
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