KR20020052056A - Apparatus and Method for Controlling Mold Level in Dynamic Soft Reduction - Google Patents
Apparatus and Method for Controlling Mold Level in Dynamic Soft Reduction Download PDFInfo
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- KR20020052056A KR20020052056A KR1020000081236A KR20000081236A KR20020052056A KR 20020052056 A KR20020052056 A KR 20020052056A KR 1020000081236 A KR1020000081236 A KR 1020000081236A KR 20000081236 A KR20000081236 A KR 20000081236A KR 20020052056 A KR20020052056 A KR 20020052056A
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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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- 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
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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
- B22D11/12—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
- B22D41/14—Closures
- B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
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Abstract
본 발명은 다이나믹 소프트 리덕션 시 주형 내 용강레벨 제어장치 및 제어방법에 관한 것으로서, 연속주조기의 주형 내 용강레벨 제어장치에 있어서, 스트랜드 세그먼트(1)의 롤갭을 검출하는 롤갭 측정장치(2)와; 용강의 응고 완료점을 산출하는 프로세스 컴퓨터(3)와; 상기 프로세스 컴퓨터(3)에 연결되어 롤갭의 정보와 응고 완료점 정보를 수신하여 용강의 변화량을 산출하는 보상인자 산출부(4)와; 주형(13) 내 용강레벨을 검출하는 레벨감지센서(5)와; 상기 보상인자 산출부(4)에서 산출한 용강의 변화량과 레벨감지센서(5)에 의한 주형 내 용강레벨을 비교하는 비교연산부 (6)와; 상기 비교연산부(6)에 연결되어 비교연산부(6)의 출력을 입력하여 용강레벨을 제어하는 용강레벨 제어부(7) 및; 상기 용강레벨 제어부(7)에 연결되어 용강레벨 제어부(7)의 출력신호로 슬라이드 게이트(8)를 구동하는 게이트 구동부(9)로 구성되어 연속주조공정에 있어서, 다이나믹 소프트 리덕션을 실시하는 경우에 응고 완료점 길이와 소프트 리덕션량을 연속적으로 측정하여 용강레벨제어기의 보상인자로 활용함으로써 보다 정확하게 용강레벨을 제어할 수 있어서 주편의 품질 향상 및 작업의 안정성을 높일 수 있는 장점이 있다.The present invention relates to a molten steel level control device and a control method in a mold during dynamic soft reduction, comprising: a roll gap measuring device (2) for detecting a roll gap of a strand segment (1); A process computer 3 for calculating the solidification completion point of the molten steel; A compensation factor calculator 4 connected to the process computer 3 for receiving roll gap information and solidification completion point information for calculating variation in molten steel; A level detecting sensor 5 for detecting the molten steel level in the mold 13; A comparison calculation unit (6) for comparing the molten steel level calculated by the compensation factor calculator (4) with the molten steel level in the mold by the level sensor (5); A molten steel level control unit 7 connected to the comparison operation unit 6 to control the molten steel level by inputting the output of the comparison operation unit 6; In the case of a continuous casting process, dynamic soft reduction is performed by the gate driver 9 connected to the molten steel level control unit 7 and driving the slide gate 8 with the output signal of the molten steel level control unit 7. By continuously measuring the solidification point length and the amount of soft reduction and using it as a compensating factor of the molten steel level controller, the molten steel level can be controlled more accurately, which has the advantage of improving the quality of cast steel and improving the work stability.
Description
본 발명은 주조 중 다이나믹 소프트 리덕션 시 스트랜드 세그먼트의 롤갭 정보와 응고 완료점 정보를 연속적으로 측정하여 주형 내 용강레벨 제어기의 보상인자로 활용함으로써 주형 내 용강레벨을 정밀하게 제어할 수 있는 다이나믹 소프트 리덕션 시 주형 내 용강레벨 제어장치 및 제어방법에 관한 것이다.According to the present invention, the dynamic gap of the molten steel can be precisely controlled by using the compensation factor of the molten steel level controller by continuously measuring the roll gap information and the solidification completion point information of the strand segment during the dynamic soft reduction during casting. The present invention relates to a molten steel level control apparatus and a control method.
연속주조공정에서 소프트 리덕션이란 주조 중 스트랜드 내 어느 지점에서 형성되는 응고 완료점을 도출하여 응고 완료점 부근에 존재하는 세그먼트의 롤갭을 축소하여 응고 완료점 근처에서 발생하는 주편 결함을 없애는 프로세스를 의미한다.In the continuous casting process, soft reduction refers to a process of eliminating cast defects occurring near the solidification completion point by deriving the solidification completion point formed at a certain point in the strand during casting to reduce the roll gap of the segment near the solidification completion point. .
상기한 소프트 리덕션은 크게 2가지 방식으로 나눌 수 있는 데, 첫째는 스태틱 방식으로서 주조 속도를 일정하게 유지하여 응고 완료점이 주조 중에 바뀌지 않도록 하여 소프트 리덕션을 하는 방식이며, 둘째는 다이나믹 방식으로서 주조 속도변경이나 강종에 따라 응고 완료점이 계속하여 변화할 경우 응고 완료점을 자동으로 감지하여 응고 완료점 근처에서 소프트 리덕션하는 방식이다.The above mentioned soft reduction can be largely divided into two methods. First is the static method, which maintains a constant casting speed so that the solidification completion point does not change during casting, and the second is a dynamic method, which changes the casting speed. If the solidification completion point is continuously changed according to steel grade or steel grade, the solidification completion point is automatically detected and soft reduction near the solidification completion point is performed.
한편 종래에는 레벨감지센서로부터 주형 내 용강의 레벨을 검출하여 작업자에 의해 미리 설정된 설정값과 비교함으로써 그 편차 정보만을 이용하여 용강레벨을 제어한다. 따라서 주조 중 주조속도 변경으로 인하여 다이나믹 소프트 리덕션을 실시하는 경우에는 주편 내부에 미응고된 용강이 몰드 하부로부터 다시 흘러들어오므로 용강으로 인하여 용강의 레벨을 일시적으로 변경시키는 문제점이 발생한다.On the other hand, conventionally, the level of the molten steel in the mold is detected by the level sensor and compared with a preset value set by the operator to control the molten steel level using only the deviation information. Therefore, when dynamic soft reduction is performed due to a change in casting speed during casting, a problem occurs that temporarily changes the level of the molten steel due to the molten steel since unsolidified molten steel flows again from the lower part of the mold.
본 발명은 상기한 실정을 감안하여 발명한 것으로서, 응고 완료점 길이 함수와 소프트 리덕션량 함수를 용강레벨 제어기의 보상인자로 이용하여 다이나믹 소프트 리덕션을 실시하는 경우에 발생하는 용강레벨의 변동을 보다 정밀하게 제어하는 다이나믹 소프트 리덕션 시 주형 내 용강레벨 제어장치 및 제어방법을 제공함에 그 목적이 있다.The present invention has been invented in view of the above-described situation, and more precisely measures the variation of the molten steel level generated when dynamic soft reduction is performed using the solidification point length function and the soft reduction function as a compensation factor of the molten steel level controller. The purpose of the present invention is to provide a molten steel level control apparatus and a control method in the case of dynamic soft reduction.
도 1은 연속주조설비의 전체 구성도,1 is an overall configuration diagram of a continuous casting facility,
도 2는 본 발명 다이나믹 소프트 리덕션 시 주형 내 용강레벨 제어장치의 구성도,2 is a configuration diagram of a molten steel level control apparatus in a mold at the present invention dynamic soft reduction;
도 3은 본 발명에 따른 주조 중 다이나믹 소프트 리덕션 시 주형 내 용강레벨의 제어를 실행하는 순서도이다.3 is a flow chart for controlling the molten steel level in the mold during dynamic soft reduction during casting according to the present invention.
〈도면중 주요부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>
1 : 스트랜드 세그먼트 2 : 롤갭 측정장치1 strand strand 2 roll gap measuring device
3 : 프로세스 컴퓨터 4 : 보상인자 산출부3: process computer 4: compensation factor calculation unit
5 : 레벨감지센서 6 : 비교연산부5: Level detection sensor 6: Comparative operation unit
7 : 용강레벨 제어부 8 : 슬라이드 게이트7: molten steel level control part 8: slide gate
9 : 게이트 구동부 10 : 턴디쉬9: gate driver 10: tundish
11 : 용강 12 : 래들11: molten steel 12: ladle
13 : 주형13: mold
상기한 목적을 달성하기 위한 본 발명 다이나믹 소프트 리덕션 시 주형 내 용강레벨 제어장치는 주조 중 다이나믹 소프트 리덕션을 실시하는 연속주조기의 주형 내 용강레벨 제어장치에 있어서, 스트랜드 세그먼트(1)의 롤갭을 검출하는 롤갭 측정장치(2)와; 용강의 응고 완료점을 산출하는 프로세스 컴퓨터(3)와; 상기 프로세스 컴퓨터(3)에 연결되어 롤갭의 정보와 응고 완료점 정보를 수신하여 용강의 변화량을 산출하는 보상인자 산출부(4)와; 주형 내 용강레벨을 검출하는 레벨감지센서(5)와; 상기 보상인자 산출부(4)에서 산출한 용강의 변화량과 레벨감지센서(5)에 의한 주형(13) 내 용강레벨을 비교하는 비교연산부(6)와; 상기 비교연산부(6)에 연결되어 비교연산부(6)의 출력을 입력하여 용강레벨을 제어하는 용강레벨 제어부(7) 및; 상기 용강레벨 제어부(7)에 연결되어 용강레벨 제어부(7)의 출력신호로 슬라이드 게이트(8)를 구동하는 게이트 구동부(9)로 구성되는 것을 특징으로 한다.The molten steel level control device in the mold at the present invention dynamic soft reduction to achieve the above object is to detect the roll gap of the strand segment (1) in the molten steel level control device of the continuous casting machine for performing dynamic soft reduction during casting A roll gap measuring device 2; A process computer 3 for calculating the solidification completion point of the molten steel; A compensation factor calculator 4 connected to the process computer 3 for receiving roll gap information and solidification completion point information for calculating variation in molten steel; A level detecting sensor 5 for detecting the molten steel level in the mold; A comparison operation unit 6 for comparing the amount of change in the molten steel calculated by the compensation factor calculating unit 4 with the molten steel level in the mold 13 by the level sensor 5; A molten steel level control unit 7 connected to the comparison operation unit 6 to control the molten steel level by inputting the output of the comparison operation unit 6; And a gate driver 9 connected to the molten steel level controller 7 to drive the slide gate 8 with an output signal of the molten steel level controller 7.
또한 본 발명 다이나믹 소프트 리덕션 시 주형 내 용강레벨 제어방법은 스트랜드 세그먼트(1)에 설치되어 있는 롤갭 측정장치(2)로 롤갭을 측정하는 단계와; 프로세스 컴퓨터(3)로 용강의 응고 완료점을 산출하는 단계와; 상기 롤갭과 응고 완료점 정보를 이용하여 보상인자 산출부(4)에서 용강의 변화량을 산출하는 단계와; 비교연산부(6)에서 상기 보상인자 산출부(4)에서 도출한 용강의 변화량과 레벨감지센서(5)로 검출한 주형(13) 내 용강레벨 및 작업자에 의해 미리 설정된 용강레벨을 비교하여 용강레벨의 편차를 구하는 단계 및; 용강레벨 제어부(7)에서 상기 구해진 용강레벨의 편차로 게이트 구동부(9)를 제어함으로써 게이트 구동부(9)가 슬라이드 게이트(8)를 구동하는 단계로 이루어진 것을 특징으로 한다.In addition, the molten steel level control method in the mold during the dynamic soft reduction of the present invention comprises the steps of measuring the roll gap with a roll gap measuring device (2) installed in the strand segment (1); Calculating a solidification completion point of the molten steel with the process computer 3; Calculating variation of molten steel in the compensation factor calculator 4 using the roll gap and the solidification completion point information; The molten steel level is compared by comparing the variation of the molten steel derived from the compensation factor calculator 4 with the molten steel level in the mold 13 detected by the level detecting sensor 5 and the molten steel level preset by the operator. Obtaining a deviation of; The gate driver 9 drives the slide gate 8 by controlling the gate driver 9 by the deviation of the obtained molten steel level from the molten steel level controller 7.
일반적으로 연속주조설비에 있어서 스트랜드 세그먼트(1)는 상하 각각 5 ∼ 6개의 롤을 하나의 그룹으로 설정하여 1개의 세그먼트로 구성되어 있으며, 소프트 리덕션을 실시할 수 있는 연주기의 세그먼트는의 네 모서리에는 세그먼트의 상판을 구동시킬 수 있는 구동부가 설치되어 있다.In general, in the continuous casting equipment, the strand segment 1 is composed of one segment by setting five to six rolls up and down in one group. The drive part which can drive the upper plate of a segment is provided.
여기서 소프트 리덕션 실시를 위한 전체 프로세스를 살펴보면, 도 2에 도시한 바와 같이 상위 제어기인 프로세스 컴퓨터(3)는 생산되는 주편에 대한 적절한 온도 정보와 기타 정보를 이용한 응고 완료점 도출 모델을 통하여 현재 주조되고 있는 주편에 있어서 응고 완료점을 개략적으로 추정하고, 응고 완료점 근처에 존재하는 몇 개 세그먼트의 롤갭 구동장치를 구동시켜 적절한 롤갭을 조절함으로써 소프트 리덕션이 이루어진다.Referring to the entire process for the soft reduction process, as shown in Figure 2, the process computer 3, the upper controller, is currently cast through the solidification completion point derivation model using the appropriate temperature information and other information about the produced cast steel Soft reduction is achieved by roughly estimating the solidification completion point in the cast slab, and by adjusting the appropriate roll gap by driving a roll gap drive of several segments that exist near the solidification completion point.
이와 같은 소프트 리덕션을 실시할 경우, 현재 생산되는 주편 내부에 미응고된 용강이 있어서, 그 미응고된 용강이 주형(13) 하부를 통하여 몰드로 유입되는현상이 발생하게 되고, 이 때 순간적으로 주형(13) 내 용강의 레벨이 상승하여 운전자가 목표로 하는 적절한 레벨을 유지할 수 없게 되는 문제점이 있다.In the case of performing such soft reduction, there is an unsolidified molten steel inside the currently produced cast steel, and the unsolidified molten steel flows into the mold through the bottom of the mold 13, and at this time, the mold (13) There is a problem that the level of the molten steel rises and the driver cannot maintain the proper level as the target.
또한 소프트 리덕션을 실시할 경우 주형(13) 내 용강레벨 변동에 영향을 미치는 인자를 살펴보면, 첫째 리덕션량으로서 리덕션량에 비례하여 용강레벨의 변동량도 크게 발생하게 되고, 둘째 응고 완료점으로서 응고 완료점 길이에 반비례하여 용강 레벨의 변동량이 발생하게 된다.In addition, when the soft reduction is carried out, the factors affecting the molten steel level fluctuation in the mold 13 are firstly reduced, and the variation of the molten steel level also occurs in proportion to the reduction amount as the reduction amount. The amount of variation in the molten steel level occurs in inverse proportion to the length.
따라서 용강변화량(Q)는 다음 수학식 1로 표현할 수 있다.Therefore, the molten steel variation Q can be expressed by the following Equation 1.
이하, 첨부 도면을 참조하여 본 발명의 작용을 보다 더 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in more detail the operation of the present invention.
도 1은 연속주조설비의 전체 구성도, 도 2는 본 발명 다이나믹 소프트 리덕션 시 주형 내 용강레벨 제어장치의 구성도, 도 3은 본 발명에 따른 주조 중 다이나믹 소프트 리덕션 시 주형 내 용강레벨의 제어를 실행하는 순서도로서, 주조 중 주조속도나 강종의 변화가 없어 새로운 소프트 리덕션이 없을 경우에는 레벨감지센서(5)에서 주형(13) 내의 용강레벨을 검출하여 비교연산부(6)에 전송하게 되고, 현재 감지된 용강레벨과 설정된 용강레벨을 비교하여 그 편차를 산출한 후 용강레벨 제어부(7)에 전송하면 용강레벨 제어부(7)에서 미리 구성된 제어알고리즘으로 게이트 구동부(9)를 제어하여 용강레벨을 제어하게 된다. 하지만 주조 중 주조속도나 강종의 변화가 있어 새로운 소프트 리덕션을 실시해야 되는 경우에는 각 세그먼트( 1)에 설치되어 있는 롤갭 측정장치(2)로부터 새로운 롤갭을 측정하여 보상인자 산출부(4)로 전송하고, 프로세스 컴퓨터(3)내 응고 완료점 검출 모델로부터 응고 완료점을 계산하여 도출된 응고 완료점을 보상인자 산출부(4)로 전송하면, 보상인자 산출부(4)에서는 새로운 소프트 리덕션으로 인하여 주형(13) 내 용강의 변동분을 상기 수학식 1과 같이 도출하여 그 값을 비교연산부(6)에 전달하면, 비교연산부(6)는 용강의 변동분(Q)과 작업자가 설정한 설정값 및 레벨감지센서(5)로부터 측정된 현재의 용강 레벨값을 가감하여 용강레벨 제어부(7)에 전송하면, 용강레벨 제어부( 7)가 게이트 구동부(9)를 제어하여 적절한 게이트량을 조절함으로써 주형(13) 내 용강의 레벨을 제어하게 된다.1 is an overall configuration diagram of the continuous casting equipment, Figure 2 is a block diagram of the molten steel level control apparatus in the mold during the dynamic soft reduction of the present invention, Figure 3 is a control of the molten steel level in the mold during dynamic soft reduction according to the present invention As a flow chart to be executed, when there is no change in casting speed or steel grade during casting, and there is no new soft reduction, the level sensor 5 detects the molten steel level in the mold 13 and transmits it to the comparison operation section 6, and When the detected molten level is compared with the set molten level, the deviation is calculated and transmitted to the molten steel level control unit 7, and the molten steel level control unit 7 controls the gate driver 9 with a preconfigured control algorithm to control the molten steel level. Done. However, if there is a change in casting speed or steel grade during casting and a new soft reduction is to be performed, the new roll gap is measured from the roll gap measuring device 2 installed in each segment 1 and transmitted to the compensation factor calculation unit 4. Then, when the solidification completion point derived by calculating the solidification completion point from the solidification completion point detection model in the process computer 3 is transmitted to the compensation factor calculation unit 4, the compensation factor calculation unit 4 causes the new soft reduction. When the variation of the molten steel in the mold 13 is derived as shown in Equation 1 above, and the value is transferred to the comparison calculation unit 6, the comparison calculation unit 6 sets the variation Q of the molten steel and the set value and level set by the operator. When the present molten steel level value measured by the sensing sensor 5 is added or subtracted to the molten steel level control unit 7, the molten steel level control unit 7 controls the gate driver 9 to adjust the appropriate gate amount so that the mold 13 ) The level of molten steel is controlled.
상기한 바와 같이 본 발명은 연속주조공정에 있어서, 다이나믹 소프트 리덕션을 실시하는 경우에 응고 완료점 길이와 소프트 리덕션량을 연속적으로 측정하여 용강레벨제어기의 보상인자로 활용함으로써 보다 정확하게 용강레벨을 제어할 수 있어서 주편의 품질 향상 및 작업의 안정성을 높일 수 있는 장점이 있다.As described above, in the continuous casting process, when the dynamic soft reduction is performed, the molten steel level can be more accurately controlled by continuously measuring the solidification completion point length and the soft reduction amount as a compensation factor of the molten steel level controller. It is possible to improve the quality of the cast and increase the stability of the work.
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| CN102343426A (en) * | 2011-09-07 | 2012-02-08 | 河北钢铁股份有限公司邯郸分公司 | On-line fault judgment and early-warning method for displacement sensor based on dynamic soft reduction |
| KR101316756B1 (en) * | 2011-11-03 | 2013-10-10 | 주식회사 포스코 | Control method for Centerline Segregation by measuring slab form |
| CN105066864A (en) * | 2015-08-10 | 2015-11-18 | 山西太钢不锈钢股份有限公司 | Rolling mill position sensor running state detection method |
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| JPH01133644A (en) * | 1987-11-20 | 1989-05-25 | Ishikawajima Harima Heavy Ind Co Ltd | Method for starting casting in twin roll type continuous casting machine |
| JPH10211550A (en) * | 1997-01-24 | 1998-08-11 | Sumitomo Metal Ind Ltd | Continuous casting of thin slabs |
| KR20020017028A (en) * | 2000-08-28 | 2002-03-07 | 이구택 | Apparatus and method for controlling strip casting |
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| CN102343426A (en) * | 2011-09-07 | 2012-02-08 | 河北钢铁股份有限公司邯郸分公司 | On-line fault judgment and early-warning method for displacement sensor based on dynamic soft reduction |
| KR101316756B1 (en) * | 2011-11-03 | 2013-10-10 | 주식회사 포스코 | Control method for Centerline Segregation by measuring slab form |
| CN105066864A (en) * | 2015-08-10 | 2015-11-18 | 山西太钢不锈钢股份有限公司 | Rolling mill position sensor running state detection method |
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