KR100423519B1 - A method of controlling a shearing of slab in a continuous casting process - Google Patents
A method of controlling a shearing of slab in a continuous casting process Download PDFInfo
- Publication number
- KR100423519B1 KR100423519B1 KR10-1999-0025170A KR19990025170A KR100423519B1 KR 100423519 B1 KR100423519 B1 KR 100423519B1 KR 19990025170 A KR19990025170 A KR 19990025170A KR 100423519 B1 KR100423519 B1 KR 100423519B1
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- weight
- slab
- shear
- sum
- residual
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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
- B22D11/12—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
Abstract
본 발명에 따른 연속주조시 전단제어방법에 의하면, 수용가의 주문에 따른 전단할 슬래브에 대한 주문정보를 입력받으며, 연속주조 라인에 남아있는 용강의 잔여중량을 산출하고, 입력된 슬래브의 지시최대/하한중량합을 산출하고, 잔여중량과 지시상한중량합과 지시하한중량합에 의해 전단할 슬래브의 매수를 가감하고, 전단할 각 슬래브별 목표중량의 합을 산출하고, 잔여중량과 목표중량의 합과 전단할 슬래브의 매수에 의해 각 슬래브별로 반영할 반영중량을 산출하며, 반영중량과 각 슬래브별 목표중량을 합산하여 각 전단할 슬래브별 전단중량을 산출하고, 각 슬래브별 전단길이를 산출하여 슬래브를 전단하는 함으로써 잉여 슬래브를 감소시킬 수 있다.According to the shear control method during continuous casting according to the present invention, receiving order information for the slab to be sheared according to the customer's order, calculate the remaining weight of the molten steel remaining in the continuous casting line, the maximum indication / of the input slab Calculate the lower limit weight sum, subtract or subtract the number of slabs to shear from the sum of the remaining weight, the indicated upper limit and the lower limit weight, calculate the sum of the target weights for each slab to be sheared, and add the remaining and target weights together. Calculate the reflecting weight to be reflected for each slab by the number of slabs to be sheared, and calculate the shear weight for each slab to be sheared by summing the reflected weight and the target weight for each slab, and calculating the shear length for each slab By shearing the excess slab can be reduced.
Description
본 발명은 연속주조시 전단 제어방법에 관한 것으로, 상세하게는 미니밀 연속주조 공정에서 연속주조중 잉여재 발생을 최소화할 수 있도록 하는 연속주조시 전단 제어방법에 관한 것이다.The present invention relates to a shear control method during continuous casting, and more particularly, to a shear control method during continuous casting to minimize the occurrence of surplus material during continuous casting in the mini mill continuous casting process.
일반적으로 연속주조법이라 함은 종래의 조괴에서 분괴압연을 거쳐 슬래브나 블룸을 만드는 방법에 비하여 잉곳케이스(Ingot Case)의 주조, 형발, 균열, 분괴압연을 생략하고 직접 용강을 주형에 주입하여 냉각, 응고시켜 연속적으로 슬래브나, 블룸, 빌릿등을 제조하는 방법이다.In general, the continuous casting method is that ingot case casting, molding, cracking, and rolling of the ingot case is omitted, and molten steel is directly injected into the mold to cool, It solidifies and produces a slab, a bloom, a billet, etc. continuously.
연속주조설비는 위에서 주입되는 용강이 주형을 통하여 아래로 흐름에 따라 주형의 단면형상으로 응고되면서 연속 생산하는 방식으로 되어 잇다. 정밀하게 온도를 맞추어 출강된 용강을 래들(Ladle)에 의해 연주기 주상으로 이송한 다음, 중간 용기인 턴디시(Tundish)로 주입한다. 턴디시에서는 용강중 게재물을 부상 분리시키며 몰드(Mold)내로 용강을 주입한다.Continuous casting equipment is produced by continuously producing molten steel injected from above through the mold and solidifying into the cross-sectional shape of the mold. The molten steel with precise temperature adjustment is transferred to the caster column by ladle, and then injected into the intermediate container Tundish. In tundish, molten steel is injected into the mold while floating the separation of molten steel.
여기서 다시 여러가닥의 주형에 주입하는데 주형은 냉각수를 통하게 되어 있어 내부의 용강은 점차 응고된다. 주입된 용강은 주형의 밑바닥에 미리 받쳐져 있는 더미바(Dummy Bar)의 선단에 응고, 고착되고 더미바를 핀치롤(Pinch Roll)로 잡아당겨 늘림으로써 응고된 주편도 내려가며 주형을 상하로 운동시켜 강편이 주형에 부착되는 것을 방지한다.Here, the mold is injected into several strands again, and the mold is passed through the cooling water so that the molten steel inside gradually solidifies. The injected molten steel solidifies and adheres to the tip of the dummy bar, which is pre-supported to the bottom of the mold, and pulls the dummy bar down with a pinch roll to move the mold down and move the mold up and down. Prevent the piece from sticking to the mold.
주형은 용착을 방지하기 위해 강제 진동시키며, 주입된 용강을 소정의 단면크기로 신속하고 균일하게 외측으로부터 응고시키기 위하여 냉각수를 사용하여 강제로 냉각시킨다.The mold is forcibly vibrated to prevent welding and is forcibly cooled using coolant to solidify the injected molten steel from the outside quickly and uniformly to a predetermined cross-sectional size.
주형에서 나온 주편은 2차 냉각대로 들어가며 2차 냉각대에서 들어온 주편은 중심을 가급적 신속히 응고시키기 위해 주편 표면에 물이 분사되며, 주편의 변형을 방지하기 위해 롤러가이드(Roller Guide)가 설치된다.The cast from the mold enters the secondary cooling zone, and the cast from the secondary cooling stand is sprayed with water onto the surface of the cast to solidify the center as quickly as possible, and a roller guide is installed to prevent the cast from being deformed.
롤러가이드를 통과한 후 벤딩디바이스(Bending Device)에 의해 소정의 곡률로 굽어진다. 냉각대에는 여러개의 핀치롤이 설치되어 주편의 전중량을 지탱하면서 소정의 주입속도에 맞춰서 주편을 인발한다. 그리고 굽혀진 주편은 교정기에서 똑바로 펴서 가스절단기에서 소정의 길이로 절단된다.After passing through the roller guide is bent to a predetermined curvature by the bending device (Bending Device). A plurality of pinch rolls are installed in the cooling table to draw the casts at a predetermined injection speed while supporting the entire weight of the casts. The bent cast piece is straightened in a straightener and cut into a predetermined length in a gas cutter.
그런데 미니밀(mini mill)은, 래들과 턴디시의 용량이 적고 전단까지의 세그먼트 길이가 짧아 전단까지 슬래브의 매수가 1매이다. 미니밀은 연속주조 후 슬래브를 압연하지 않으며 작업지시 슬래브 번호대로 생산을 한다. 그래서 지시중량 대비 도착중량이 40Ton이상 많으면 연속주조중 잉여재가 발생하게 되는데, 연속주조된 슬래브를 리덕션 밀에서 수요자의 요구두께에 따라서 압연을 하여야 하기 때문에 수용자가 주문한 슬래브 이외의 잉여재가 발생되는 문제점이 있었다.By the way, the mini mill has a small number of ladles and tundishes and a short segment length to the front end, so that the number of slabs is one to the front end. The mini mill does not roll the slab after continuous casting and produces it according to the work order slab number. Therefore, if the arrival weight is more than 40Ton compared to the indicated weight, surplus material is generated during continuous casting.In addition, the surplus material other than the slab ordered by the customer is generated because the continuous cast slab must be rolled in accordance with the required thickness of the consumer in the reduction mill. there was.
본 발명은 상기한 종래의 문제점을 해결하기 위하여 안출된 것으로써, 래들내의 용강 평량중량 오차를 제거하여 잉여재를 최소화할 수 있는 연속주조시 전단제어방법을 제공하는데 목적이 있다.An object of the present invention is to provide a shear control method during continuous casting to minimize the surplus material by eliminating the basis weight error of the molten steel in the ladle to solve the above problems.
전술한 목적을 달성하기 위하여 본 발명에 따른 연속주조시 전단제어방법은, 수용가의 주문에 따른 전단할 슬래브에 대한 주문정보를 입력받는 주문정보입력단계, 주문정보입력단계 후 연속주조 라인에 남아있는 용강의 잔여중량을 산출하는 잔여중량산출단계, 주문정보입력단계에서 입력된 슬래브의 중량범위값중에서 최소값의 합인 지시하한중량합과 슬래브의 중량범위값 중에서 최대값의 합인 지시상한중량합을 산출하는 중량합산출단계, 잔여중량산출단계에서 산출된 잔여중량과 상기 중량합산출단계에서 산출된 지시상한중량합과 지시하한중량합에 의해 상기 잔여중량에서 상기 지시하한중량합을 감한 값이 최소기준중량이하인지를 판단하여 상기 잔여중량에서 상기 지시하한중량합을 감한 값이 최소기준중량이하라고 판단되면 전단할 슬래브의 매수를 1개 감소시키고, 잔여중량에서 지시상한중량합을 감한 값이 최대기준중량 이상인지를 판단하여 잔여중량에서 지시상한중량합을 감한 값이 최대기준중량이상이라고 판단되면 전단할 슬래브의 매수를 1개 증가시켜 전단할 슬래브의 매수를 가감하는 슬래브매수산출단계, 슬래브매수산출단계 후 산출된 슬래브의 매수에 따라 전단할 각 슬래브별 목표중량의 합을 산출하는 목표총중량산출단계, 잔여중량과 목표중량의 합인 목표총중량과 슬래브매수산출단계에서 산출된 전단할 슬래브의 매수에 의해 각 슬래브별로 반영할 반영중량을 산출하는 반영중량산출단계, 반영중량과 각 슬래브별 목표중량을 합산하여 각 전단할 슬래브별 전단중량을 산출하는 전단중량산출단계, 전단중량산출단계 후 각 슬래브별 전단길이를 산출하고 슬래브를 전단하는 전단단계를 포함하는 것을 특징으로 하는 방법이다.In order to achieve the above object, the shear control method during continuous casting according to the present invention, the order information input step for receiving the order information for the slab to be sheared according to the customer's order, remaining in the continuous casting line after the order information input step Residual weight calculation step for calculating the residual weight of molten steel and ordered upper limit weight sum which is the sum of the maximum value among the slab weight range values and sum of the minimum value among the slab weight range values input in the order information input step The minimum reference weight is obtained by subtracting the indicated lower limit weight sum from the residual weight by the remaining weight calculated in the weight addition step, the residual weight calculation step, and the indicated upper limit weight sum and the lower limit weight sum calculated in the weight calculation step. If it is determined that the value obtained by subtracting the indicated lower limit weight from the residual weight is less than or equal to the minimum reference weight, Decrease the number of slabs by 1 and determine whether the value obtained by subtracting the indicated maximum weight from the residual weight is greater than or equal to the maximum reference weight. Target total weight calculation step that calculates the sum of the target weights for each slab to shear according to the number of slabs calculated after the slab count calculation step that increases or decreases the number of slabs to shear by increasing the number of sheets, and the remaining weight Reflected weight calculation step that calculates the reflected weight to be reflected for each slab by the target gross weight, which is the sum of the target weights and the slab number calculated in the slab yield calculation stage, and adds the reflected weight and the target weight for each slab. Shear weight calculation step for calculating shear weight for each slab, shear length calculation for each slab after shear weight calculation step and slab Shearing is a method comprising a shearing step.
도 1은 본 발명에 따른 연속주조시 전단제어장치의 구성도이다.1 is a block diagram of a shear control apparatus during continuous casting according to the present invention.
도 2는 본 발명에 따른 연속주조시 전단제어장치의 전기적인 구성의 블록도이다.Figure 2 is a block diagram of the electrical configuration of the shear control apparatus during continuous casting according to the present invention.
도 3a, 도 3b는 본 발명에 따른 연속주조시 전단제어장치의 제어흐름도이다.3a and 3b is a control flow chart of the shear control apparatus during continuous casting according to the present invention.
<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>
11,12:래들 30:래들커버11,12: ladle 30: ladle cover
40:턴디시 50:몰드40: Tundish 50: Mold
60:세그먼트 70:엣지히터60: segment 70: edge heater
100:전단부 110:유도히터100: shear 110: induction heater
160:무게감지부 170:길이측정부160: weight detection unit 170: length measurement unit
190:부하구동부 210:트랙킹송신부190: Load drive section 210: Tracking transmitter
220:설비제어부 310:트랙킹기능부220: facility control unit 310: tracking function
320:전단제어부 330:데이터저장부320: shear control unit 330: data storage unit
340:사양관리제어부340: specification management control unit
이하에서는 첨부한 도면을 참조하여 본 발명을 상세하게 설명하겠다.Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.
미니밀 연조주조 공정의 설비는, 용강이 들어있으며 대기위치(Watigng position)에서 대기하는 래들(Ladle)(11)을 주조위치(Casting position)로 회전시켜 후술하는 턴디시(40) 상부로 이동시키는 래들지지부(Laddle turret)(20)와, 주조위치로 이동된 래들(12)내의 용강온도 저하 방지를 위해 래들(12)의 상부를 개폐시키는 래들커버(Ladle cover)(30)와, 주조위치에 있는 래들(12)로부터 용강을 인출할수 있도록 래들(12)의 하부를 개폐시키는 슬라이드게이트(Slide gate)(13)와, 슬라이드게이트(13)가 개방되어 래들(12)로부터 인출된 용강을 주입하는 1차적 용기로써 후속 래들의 연결 또는 주조 속도 조절 또는 용강의 분배 역할을 하는 턴디시(Tundish)(40)를 구비한다.The equipment of the mini mill soft casting process is a ladle (11) which contains molten steel and waits at a standby position to rotate the ladle 11 to a casting position to move to the upper portion of the tundish 40 to be described later. Laddle turret 20, ladle cover 30 for opening and closing the upper part of the ladle 12 to prevent the molten steel temperature decrease in the ladle 12 moved to the casting position, and in the casting position A slide gate 13 for opening and closing the bottom of the ladle 12 so that the molten steel can be withdrawn from the ladle 12, and the slide gate 13 is opened to inject molten steel drawn from the ladle 12. The primary vessel is provided with a tundish 40 which serves to connect subsequent ladles or to control casting speed or to distribute molten steel.
그리고 전술한 턴디시(40)로부터 주입된 용강을 1차 냉각하여 수요가가 요구하는 크기로 형성할 수 있도록 동(Cu)으로 이루어지는 몰드(Mold)(50)와, 몰드(50)에 용강을 주입시 초기에 후술하는 핀치롤에 의해 인발할 수 있도록 몰드(50)로부터 일정길이를 갖는 링크식으로 된 더미바(Dummy bar)와, 주조된 슬래브가 원형을 보존하면서 완전히 응고되도록 하는 몰드(50)로부터 생성된 슬래브를 일정한 속도를 유지하면서 하부로 인발하며 슬래브를 2차 냉각시키는 핀치롤(Pinch roll)로 구성되는 세그먼트(Segment)(60)를 구비하고 있다.Then, molten steel is formed in the mold 50 made of copper and the mold 50 so that molten steel injected from the above-described tundish 40 may be first cooled to form the size required by the demand. Dummy bars having a predetermined length from the mold 50 so that they can be drawn out by a pinch roll which will be described later at the time of injection, and a mold 50 which allows the cast slab to completely solidify while preserving the original shape. And a segment 60 composed of a pinch roll that draws the slab generated from the bottom of the slab to a lower portion while maintaining a constant speed and cools the slab secondaryly.
또한, 세그먼트(60)를 통과한 슬래브의 양쪽면을 전기유도식으로 재가열하는 엣지히터(Edge heater)(70)와, 엣지히터(70)를 통과한 슬래브 표면의 불순물을 제거하는 디스케일러(Descaler)(80)와, 디스케일러(80)를 통과한 슬래브를 압하하는 제1,2압연롤(91)(92)과 제1,2압연롤(91)(92)을 통과한 슬래브를 주문크기의바(Bar)로 절단하는 전단부(Pendlum shear)(100)와, 전단부(100)에서 절단된 바(Bar)의 전면을 가열하는 유도히터(Inductive heater)(110)등으로 구성된다. 미설명부호 120은 가속로이며, 130은 코일스테이션이다.In addition, an edge heater 70 electrically reheats both sides of the slab passing through the segment 60, and a descaler for removing impurities on the surface of the slab passing through the edge heater 70. 80) and the first and second rolling rolls 91 and 92 and the first and second rolling rolls 91 and 92 which reduce the slab passed through the descaler 80. It is composed of a front end (Pendlum shear) 100 to cut into a bar (Bar), an inductive heater (110) for heating the front of the bar (Bar) cut at the front end (100). Reference numeral 120 is an accelerator, and 130 is a coil station.
본 발명에 따른 연속주조시 전단제어방법의 전기적인 구성은 크게 나누어 공정 제어 시스템(Process Control System, 이하 PCS라 칭함)(300)과 프로그래머블 논리 제어기(Programmable Logic Controller, 이하 PLC라 칭함)(200)와, 각종 감지수단 그리고 부하구동부(190)로 이루어진다.The electrical configuration of the shear control method during continuous casting according to the present invention is roughly divided into a process control system (hereinafter referred to as a PCS) 300 and a programmable logic controller (hereinafter referred to as a PLC) 200 And various sensing means and a load driving unit 190.
전술한 각 종 감지수단은, 대기위치감지부(140), 주조위치감지부(150), 무게감지부(160), 길이측정부(170), 래들커버작동입력부(180) 등이 있다.Each of the above-described sensing means includes a standby position detecting unit 140, a casting position detecting unit 150, a weight detecting unit 160, a length measuring unit 170, a ladle cover operation input unit 180, and the like.
그리고 PLC(200)는 전술한 각 감지수단으로부터 신호를 입력받는 트랙킹송신부(210)와 각종 설비의 구동을 제어하는 설비제어부(220)로 구성된다. 또한 PCS(300)는 PLC(200)의 트랙킹송신부(210)로부터 출력되는 신호를 입력받아 각 설비위치에 따른 슬래브를 트랙킹하는 트랙킹기능부(310)와, 트랙킹기능부(310)와 후술하는 데이터저장부(330)에 저장된 정보에 의해서 목표중량으로 전단길이를 산출하는 전단제어부(320), 수요사양별 정보와 그에 따른 작업관리 정보를 입력하는 사양관리제어부(340)와, 사양관리제어부(340)에서 입력된 정보를 저장하는 데이터저장부(330) 등으로 구성된다.And PLC 200 is composed of a tracking transmission unit 210 receives a signal from each of the above-described sensing means and the facility control unit 220 for controlling the driving of various equipment. In addition, the PCS 300 receives a signal output from the tracking transmitter 210 of the PLC 200, and a tracking function unit 310 for tracking the slab according to each facility position, a tracking function unit 310, and data to be described later. The shear control unit 320 for calculating the shear length by the target weight based on the information stored in the storage unit 330, the specification management control unit 340 for inputting the demand specification information and work management information according to the specification management control unit 340 It consists of a data storage unit 330 for storing the information input from).
또한 PCS(300)의 전단제어부(320)는 PLC(200)의 설비제어부(220)와도 접속되어 있는데, 설비제어부(220)는 전단제어부(320)로부터 출력되는 신호에 근거하여 각종 설비를 제어한다. 특히, 연속 압연된 바(Bar)를 수요자가 주문한 크기에 맞도록 전단하는 장치인 전단부(펜드럼시어(Pendlum Shear))(100)를 비롯한 각종 부하의 작동을 제어한다.In addition, the front end control unit 320 of the PCS 300 is also connected to the facility control unit 220 of the PLC 200, the facility control unit 220 controls various equipment based on the signal output from the front end control unit 320. . In particular, it controls the operation of various loads, including a front end portion (Pendlum Shear) 100, which is a device for shearing a continuously rolled bar to fit the size ordered by the consumer.
이하에서는 본 발명에 따른 작동을 제어 흐름도에 따라 설명하겠다. 제어흐름에서 전달되는 데이타는 전기적 신호로서 센서에 의하여 중량을 감지하는 아나로그신호와, 중량을 지시하는 디지탈신호로 이루어진다.The operation according to the invention will now be described according to a control flow diagram. Data transmitted in the control flow is an electrical signal consisting of an analog signal for sensing the weight by the sensor and a digital signal for indicating the weight.
관리자는 수요가의 주문에 따른 정보, 즉 슬래브별 두께, 폭, 최대/최소 중량등의 정보를 사양관리제어부(340)를 통하여 입력(S10)하게 되는데, 사양관리제어부(340)로 입력된 수요가의 주문에 따른 정보는 데이터저장부(330)에 저장된다.The manager inputs information according to the order of the demand price, that is, information such as thickness, width, maximum / minimum weight for each slab through the specification management control unit 340 (S10), the demand input to the specification management control unit 340 Information according to the temporary order is stored in the data storage unit 330.
그리고 전단제어부(320)는 래들지지부(20)를 제어하여 대기위치(Wating position)에 있는 래들(L/D)(11)을 주조위치(Casting position)로 이동시킨다. 래들(12)이 래들지지부(20)에 의하여 주조위치로 이동되면 조업자는 래들커버(30)를 닫기 위해서 래들커버작동입력부(180)로 래들커버닫음 명령을 입력한다. 래들커버작동입력부(180)로부터 입력된 래들커버닫음 명령은 트랙킹송신부(210)로 입력되어 트랙킹기능부(310)를 통해 전단제어부(320)로 입력된다. 그에 따라서 전단제어부(320)는 래들커버(30)를 닫기 위해서 설비제어부(220)를 제어하여 부하구동부(190)로 하여금 래들커버(30)를 닫도록 제어한다. 그리고 래들커버(30)의 닫힘을 인지하게 된다.And the shear control unit 320 controls the ladle support 20 to move the ladle (L / D) 11 in the waiting position (Wating position) to the casting position (Casting position). When the ladle 12 is moved to the casting position by the ladle support portion 20, the operator inputs the ladle cover closing command to the ladle cover operation input unit 180 to close the ladle cover 30. The ladle cover closing command input from the ladle cover operation input unit 180 is input to the tracking transmission unit 210 and is input to the front end control unit 320 through the tracking function unit 310. Accordingly, the front end control unit 320 controls the facility control unit 220 to close the ladle cover 30 to control the load driving unit 190 to close the ladle cover 30. Then, the closing of the ladle cover 30 is recognized.
래들커버(30)가 닫히고 나면 전단제어부(320)는 무게감지부(160)를 통해 래들의 총 중량(래들커버와 래들 그리고 용강의 총 중량)을 감지하여 도착중량을 산출한다(S20).After the ladle cover 30 is closed, the shear control unit 320 detects the total weight of the ladle (the total weight of the ladle cover, the ladle and the molten steel) through the weight sensing unit 160 to calculate the arrival weight (S20).
그리고 슬라이드게이트(Slide gate)(13)를 오픈시켜 래들(L/D)(12)내의 용강이 턴디시(T/D)(40)로 투입되도록 한다.Then, the slide gate 13 is opened to allow molten steel in the ladle L / D 12 to be introduced into the tundish 40.
이때 무게감지부(160)는 턴디시(T/D)(40)의 중량을 감지하여 그에 따른 신호를 PLC(200)의 트랙킹송신부(210)로 출력하게 된다. 그러면 트랙킹송신부(210)는 무게감지부(160)로부터 출력된 신호를 PCS(300)의 트랙킹기능부(310)로 송신하고 트랙킹기능부(310)는 그 신호를 다시 전단제어부(320)로 출력한다. 그에 따라서 전단제어부(320)는 래들(L/D)(12)로부터 용강이 턴디시(T/D)(40)로 투입되기 전에 턴디시(T/D)(40)에 남아있던 용강의 잔여중량과 새로 투입된 용강의 중량을 산출한다. 그리고 전단제어부(320)는 그 산출된 중량에 의해서 각 슬래브별 전단중량과 전단 예정길이를 산출한다(S30).At this time, the weight sensing unit 160 detects the weight of the tundish (T / D) 40 and outputs a signal according to the tracking transmitter 210 of the PLC (200). Then, the tracking transmitter 210 transmits the signal output from the weight sensing unit 160 to the tracking function unit 310 of the PCS 300, and the tracking function unit 310 outputs the signal to the front end controller 320 again. . Accordingly, the shear control unit 320 is the remaining of the molten steel remaining in the tundish (T / D) 40 before the molten steel is introduced into the tundish (T / D) 40 from the ladle (L / D) 12. Calculate the weight and the weight of the newly added molten steel. The shear control unit 320 calculates the shear weight for each slab and the predetermined shear length based on the calculated weight (S30).
이때 잉여재의 발생을 줄이기 위해서, 산출된 중량이 수요가 슬래브의 지시중량보다 크면 슬래브별 전단중량값을 최대중량범위내에서 증가시키고, 지시중량보다 적으면 슬래브별 전단중량값을 최소중량보다는 큰 범위내에서 감소시킨다. 그리고 나서 산출된 전단 예정길이를 PLC의 설비제어부로 출력한다.At this time, in order to reduce the occurrence of surplus material, if the calculated weight is greater than the indicated weight of the slab, the shear weight value for each slab is increased within the maximum weight range, and if it is less than the indicated weight, the shear weight value for each slab is larger than the minimum weight. Reduce within. Then, the calculated estimated shear length is output to the equipment control unit of the PLC.
한편 전단제어부(320)는 길이측정부(170)를 통해서 전단부(100)를 통과한 슬래브의 길이를 측정하여, 그 측정된 슬래브의 길이정보를 설비제어부로 출력한다. 그러면 설비제어부(220)는 전단제어부(320)에서 출력되는 길이정보를 입력받아 현재 전단부(100)를 통과한 슬래브의 길이를 산출(S40)하고 그 길이가 전단 예정길이가 되었는지를 판단한다(S50).On the other hand, the front end control unit 320 measures the length of the slab passed through the front end 100 through the length measuring unit 170, and outputs the length information of the measured slab to the facility control unit. Then, the facility control unit 220 receives the length information output from the front end control unit 320, calculates the length of the slab currently passing through the front end 100 (S40) and determines whether the length is the expected length of shear ( S50).
그래서 단계(S50)에서 판단결과 현재 전단부(100)를 통과한 슬래브의 길이가 전단 예정길이가 되었다고 판단되면 설비제어부(220)는 전단부(100)를 작동시켜 슬래브를 전단한다(S60). 그에 따라서 트랙킹송신부(200)는 전단이벤트와 전단길이정보를 PCS(300)의 트랙킹기능부(310)를 통하여 전단제어부(320)로 전달한다.Thus, if it is determined in step S50 that the length of the slab currently passing through the shear section 100 becomes the shear length, the facility control unit 220 shears the slab by operating the shear section 100 (S60). Accordingly, the tracking transmitter 200 transmits the shear event and the shear length information to the shear controller 320 through the tracking function 310 of the PCS 300.
전단제어부(320)는 차기 전단 예정 슬래브별 두께, 폭, 비중을 산출(S70)하고, 주조위치에 위치한 래들(L/D)(12)에 남아있는 잔여중량을 포함한 설비상에서 전단되지 않고 걸쳐있는 잔여중량을 산출한다(S80). 즉, 잔여중량은 {래들(L/D)잔량 + 턴디시(T/D)잔량 + (몰드~전단부 사이의 슬래브중량)} - (래들(L/D)중량 + 턴디시(T/D)중량)에 의해 산출된다. 그리고 래들(12)내의 용강중량은 {(무게감지부에 의한 래들(12)의 총중량) - (래들자체중량 + 래들커버중량)}에 의해 산출된다. 그리고 전단할 지시매수로 지시상한중량합과 지시하한중량합을 산출한다(S90).The shear control unit 320 calculates the thickness, width, and specific gravity for each of the next scheduled shear slabs (S70), and is not sheared on the equipment including the residual weight remaining in the ladle (L / D) 12 located at the casting position. The residual weight is calculated (S80). That is, the remaining weight is {the amount of ladle (L / D) + tundish (T / D) remaining + (slab weight between mold and shear)}-(ladle (L / D) weight + tundish (T / D) ) By weight). And the molten steel weight in the ladle 12 is computed by {(total weight of the ladle 12 by a weight detection part)-(ladle itself weight + ladle cover weight)}. The indicated upper limit weight sum and the lower limit weight sum are calculated from the number of sheets to be sheared (S90).
그리고 나서 잔여중량에서 지시하한중량합을 감한값이 최소기준값, 예를 들어 13톤(Ton) 이하인지를 판단(S100)하는데, 판단결과 잔여중량에서 지시하한중량합을 감한값이 최소기준값, 예를 들어 13톤(Ton) 이하라고 판단되면 전단할 지시 슬래브의 매수를 감소기준값(예를 들어 1개)만큼 감소시킨다(S110).Then, it is determined whether the value obtained by subtracting the lower limit weight sum from the residual weight is less than or equal to the minimum reference value (for example, 13 tons) (S100). For example, if it is determined to be 13 tons or less, the number of instructions slabs to be sheared is reduced by a decrease reference value (for example, one) (S110).
지시슬래브의 매수를 감소기준값만큼 감소시킨 후에는 계산된 전단일정에서 마지막 슬래브 정보를 삭제한다(S120).After the number of indicating slabs is reduced by the reduction reference value, the last slab information is deleted from the calculated shear schedule (S120).
한편 단계(S100)에서 잔여중량에서 지시하한중량합을 감한값이 최소기준값이하가 아니라고 판단되면, 잔여중량에서 지시상한중량합을 감한 값이 최대 기준값, 예를 들어 27톤 이상인지를 판단한다(S101). 그리하여 판단결과 잔여중량에서 지시상한중량합을 감한 값이 최대 기준값 이상라고 판단되면 전단할 지시 슬래브 매수를 증가기준값(예를 들어 1개)만큼 증가시킨다(S102). 그리고 나서 증가된 슬래브 매수의 정보, 즉 슬래브번호, 전단중량, 길이 등을 생성한다(S103).On the other hand, if it is determined in step S100 that the value obtained by subtracting the lower limit weight sum from the residual weight is not less than the minimum reference value, it is determined whether the value obtained by subtracting the upper limit weight sum from the residual weight is the maximum reference value, for example, 27 tons or more ( S101). Thus, if it is determined that the value obtained by subtracting the upper limit weight from the remaining weight is greater than or equal to the maximum reference value, the number of indicating slabs to be sheared is increased by an increase reference value (for example, one) (S102). Then, information about the increased number of slabs, that is, slab number, shear weight, length, and the like is generated (S103).
그리고 나서, 전단할 목표 총중량을 산출한다(S130).Then, the target gross weight to be sheared is calculated (S130).
전단할 목표 총중량을 산출한 후에는 산출된 전단할 목표 총중량에서 잔여중량을 감하고 전단할 슬래브 매수로 나누어 반영중량을 산출한다(S140). 즉, 반영중량 = 전단할 목표 총중량 - 잔여 중량 / 전단할 슬랩 매수 에 의해서 반영중량을 산출한다.After calculating the target gross weight to shear, the remaining weight is subtracted from the calculated target gross weight to be sheared, and the reflected weight is calculated by dividing by the number of slabs to be sheared (S140). That is, the reflected weight is calculated by reflecting weight = target gross weight to shear-remaining weight / number of slabs to shear.
그리고 나서 슬래브별 목표중량에 반영중량을 더하여 슬래브별 전단중량을 산출(S150)하며, 두께 및 폭 그리고 비중으로 슬래브별 전단길이를 산출(S160)하고 단계(S40)으로 리턴한다.Then, the shear weight for each slab is calculated by adding the reflected weight to the target weight for each slab (S150), and the shear length for each slab is calculated (S160) by the thickness, width, and specific gravity, and the process returns to step S40.
전술한 바와 같이 본 발명에 따른 전단제어방법에 의하면, 수용가의 주문에 따른 전단할 슬래브에 대한 주문정보를 입력받으며, 연속주조 라인에 남아있는 용강의 잔여중량을 산출하고, 입력된 슬래브의 지시상한/하한중량합을 산출하고, 잔여중량과 지시상한중량합과 지시하한중량합에 의해 전단할 슬래브의 매수를 가감하고, 전단할 각 슬래브별 목표중량의 합을 산출하고, 잔여중량과 목표중량의 합과 전단할 슬래브의 매수에 의해 각 슬래브별로 반영할 반영중량을 산출하며, 반영중량과 각 슬래브별 목표중량을 합산하여 각 전단할 슬래브별 전단중량을 산출하고, 각 슬래브별 전단길이를 산출하여 슬래브를 전단하는 함으로써 잉여 슬래브를 감소시킬 수 있다.As described above, according to the shear control method according to the present invention, receiving order information about the slab to be sheared according to the customer's order, calculates the remaining weight of the molten steel remaining in the continuous casting line, the upper limit of the input slab Calculate the sum of the lower and lower limits, subtract and subtract the number of slabs to shear from the sum of the remaining and indicated upper and lower limits, and calculate the sum of the target weights for each slab to shear; Calculate the reflected weight to be reflected for each slab by the sum and the number of slabs to be sheared, calculate the shear weight for each slab to be sheared by adding the reflected weight and the target weight for each slab, and calculate the shear length for each slab By shearing the slab, the excess slab can be reduced.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5695456A (en) * | 1979-12-28 | 1981-08-01 | Kawasaki Steel Corp | Ingot cutting method in continuous casting |
| JPS58167065A (en) * | 1982-03-26 | 1983-10-03 | Hitachi Ltd | Continuous casting device |
| JPS62212047A (en) * | 1986-03-13 | 1987-09-18 | Kobe Steel Ltd | Slab cutting method for continuous casting |
| JPS63313641A (en) * | 1987-06-16 | 1988-12-21 | Nkk Corp | Apparatus for controlling cutting weight of cast slab |
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1999
- 1999-06-29 KR KR10-1999-0025170A patent/KR100423519B1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5695456A (en) * | 1979-12-28 | 1981-08-01 | Kawasaki Steel Corp | Ingot cutting method in continuous casting |
| JPS58167065A (en) * | 1982-03-26 | 1983-10-03 | Hitachi Ltd | Continuous casting device |
| JPS62212047A (en) * | 1986-03-13 | 1987-09-18 | Kobe Steel Ltd | Slab cutting method for continuous casting |
| JPS63313641A (en) * | 1987-06-16 | 1988-12-21 | Nkk Corp | Apparatus for controlling cutting weight of cast slab |
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