KR100309783B1 - Method and apparatus for evaluating quality of slab in continuous casting line - Google Patents

Method and apparatus for evaluating quality of slab in continuous casting line Download PDF

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KR100309783B1
KR100309783B1 KR1019970075868A KR19970075868A KR100309783B1 KR 100309783 B1 KR100309783 B1 KR 100309783B1 KR 1019970075868 A KR1019970075868 A KR 1019970075868A KR 19970075868 A KR19970075868 A KR 19970075868A KR 100309783 B1 KR100309783 B1 KR 100309783B1
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slab
continuous casting
quality
driver
cast
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KR1019970075868A
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Korean (ko)
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KR19990055895A (en
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천창근
신건
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신현준
재단법인 포항산업과학연구원
이구택
포항종합제철 주식회사
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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
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

PURPOSE: A method and an apparatus for evaluating quality of slab in a continuous casting line are provided to evaluate quality of slab promptly and accurately using drawing force of slab when manufacturing slab by the continuous casting line. CONSTITUTION: In a continuous casting line comprising a plural segments which have driving rolls(2) and are installed at the lower side of a mold to continuously cast slab(5), the apparatus for evaluating quality of slab in the continuous casting line comprises a speed sensor, a current sensor(8) and a voltage sensor(9) each of which are connected to a driver(6) to measure magnitudes of speed, input current and voltage of the driver(6) for driving the driving rolls(2); and a quality evaluation device(10) for calculating actual drawing forces applied to slab at that time by receiving data of measured values from the speed sensor, the current sensor(8) and the voltage sensor(9), and performing quality evaluation of slab by comparing the calculated actual drawing forces with an already inputted theoretical drawing force.

Description

연속주조설비의 주편 품질평가 방법 및 장치Method and device for quality evaluation of casting of continuous casting equipment

본 발명은 연속주조설비를 통해 주조되는 주편의 품질평가 방법 및 장치에 관한 것으로, 특히 주편의 인발력을 이용하여 주편의 품질을 평가하는 방법 및 장치에 관한 것이다.The present invention relates to a method and apparatus for evaluating the quality of cast steel cast through a continuous casting facility, and more particularly, to a method and apparatus for evaluating the quality of cast steel using the pull force of the cast steel.

연속주조설비는 강재의 대량연속적인 제조를 가능하게 하는 설비로서, 이러한 연속주조설비는 전형적으로 도1에서 보는 바와 같이 몰드(1)하방에 각각 구동롤(2)들을 가진 다수의 세그멘트(3)들로 조합구성된 스트랜드(4)를 배치하여 구성된다. 이와 같은 연속주조설비를 통해 제조되는 주편의 품질에는 몰드(1)하방의 스트랜드(4)를 통해 주편(5)이 인발주조될 때 그 주편(5)에 작용하는 인발력이 가장 큰 영향을 주게 되며, 스트랜드(4)의 각 부위에서 적당한 인발력으로 인발주조된 주편은 목적하는 양호한 형상 및 조직을 가지는 우수한 품질의 주편이 되나, 과다 또는 과소한 인발력이 작용되어 주조된 주편은 조직이 치밀하지 못하거나 어긋난 형상을 지닌 저급한 품질의 주편으로 된다.Continuous casting equipment is a facility that enables the continuous production of large quantities of steel, such continuous casting equipment typically has a plurality of segments (3) each having a driving roll (2) under the mold (1) as shown in FIG. It is configured by arranging the strands 4 constituted by them. The quality of the cast steel produced by the continuous casting facility as described above has the greatest influence on the quality of the cast steel when the cast steel 5 is drawn out through the strand 4 below the mold 1. The cast pieces drawn with the appropriate drawing force at each part of the strand 4 become the casts of good quality with the desired shape and structure desired, but the cast pieces are not dense due to the excessive or excessive drawing force applied. Low quality cast steel with misaligned shape.

나아가서, 위와 같은 연속주조설비에 있어서 주편(5)에 작용하는 실제 인발력은 각 세그멘트(3)의 구동롤(2)에 가해지는 구동력에 비례하여 결정되게 되는 바, 종래에는 이러한 관계를 고려하지 않고 일단 주조완성된 주편에 대해 물리적인 분석이나 화학적인 분석을 가해 주편의 품질을 평가하여 왔으며, 구동롤(2)을 구동시키는 모터의 입력전류를 측정하고 그 변화패턴을 분석하여 롤마모 등을 진단하는 기술도 제안된 바 있었으나 이는 주편의 품질평가와는 무관한 것이었다.Furthermore, in the continuous casting facility as described above, the actual drawing force acting on the cast piece 5 is determined in proportion to the driving force applied to the driving roll 2 of each segment 3, and conventionally, such a relationship is not considered. Once the cast has been cast, physical or chemical analysis has been performed to evaluate the quality of the cast, and the roll current is diagnosed by measuring the input current of the motor driving the driving roll (2) and analyzing the change pattern. The technique was proposed, but this was not related to the quality evaluation of cast steel.

본 발명은 이러한 배경에서 연구된 것으로, 그 목적은 연속주조설비에 의한 주편 제조시 주편의 인발력을 이용하여 주편의 품질을 신속,정확하게 평가할 수 있는 새로운 방법 및 장치를 제공하는 데에 있다.The present invention has been studied in this background, and its object is to provide a new method and apparatus capable of quickly and accurately evaluating the quality of a cast using the pull force of the cast during the production of the cast by the continuous casting equipment.

도1은 본 발명이 관련된 연속주조설비의 구성개요도,1 is a configuration diagram of a continuous casting machine according to the present invention,

도2는 본 발명에 따른 장치의 구성개요도.2 is a schematic diagram of a device according to the present invention;

* 도면중 주용부분에 대한 부호의 설명 *Explanation of symbols for main parts in drawing

1:몰드 2:구동롤 3:세그멘트1: Mold 2: Driving roll 3: Segment

4:스트랜드 5:주편 6:구동기4: strand 5: cast 6: actuator

7:속도센서 8:전류센서 9:전압센서7: Speed sensor 8: Current sensor 9: Voltage sensor

10:품질평가장치10: quality evaluation device

상기의 목적을 달성하기 위한 본 발명은 주편을 인발시키는 구동롤들을 가진 복수의 세그멘트들로 이루어진 스트랜드를 몰드하방에 설치구비하는 연속주조설비에 있어서, 상기 각 구동롤을 구동시키는 구동기의 속도와 입력 전류 및 전압을 측정하여 그 구동롤을 통해 주편에 작용하는 실제 인발력을 계산하는 단계와, 몰드내에서의 마찰력과 철정압, 벌징 등에 의한 인발저항을 구하여 이론적인 인발력을 계산하는 단계와, 상기 실제 인발력 및 이론적 인발력을 비교하여 주편의 품질을 평가하는 단계를 포함하는 것을 특징으로 하는 주편의 품질평가 방법 및 동 방법을 실행할 수 있도록 구성된 장치를 제공한다.In order to achieve the above object, the present invention provides a continuous casting facility for installing a strand consisting of a plurality of segments having a driving roll for drawing a cast under the mold, the speed and input of the driver for driving each drive roll Calculating the actual drawing force acting on the slab through the driving roll by measuring the current and the voltage; calculating the theoretical drawing force by calculating the drawing resistance due to frictional force, iron static pressure, bulging, etc .; The present invention provides a method for evaluating the quality of a cast steel and a device configured to execute the method, comprising the step of comparing the pulling force and the theoretical pull power to evaluate the quality of the cast steel.

이하에서, 본 발명을 첨부도면을 참조하여 더욱 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

도2는, 몰드(1)하방에 복수의 세그멘트(3)들로 이루어진 스트랜드(4)가 배치되어 있고, 상기 각 세그멘트(3)에는 주편(5)을 안내인발하는 구동롤(2)들과 이 구동롤(2)을 구동시키기 위한 구동기(또는 구동모터)(6)가 구비되어 있는 연속주조설비에 있어서 상기 구동롤(2)을 통해 주편(5)에 작용하는 실제 인발력을 계산하고, 이 실제 인발력을 이론적으로 계산된 인발력과 비교하여 주편(5)의 품질을 평가하는 본 발명의 방법을 실행하기 위한 장치의 구성개요를 보여 준다.FIG. 2 shows a strand 4 composed of a plurality of segments 3 disposed below the mold 1, each of which has drive rolls 2 for guiding and drawing the cast piece 5; In a continuous casting facility equipped with a drive (or drive motor) 6 for driving the drive roll 2, the actual drawing force acting on the slab 5 through the drive roll 2 is calculated, and The construction of the apparatus for implementing the method of the present invention, which evaluates the quality of the slab 5 by comparing the actual pulling force with the theoretically calculated pulling force, is shown.

본 발명에 따르면, 상기 구동기(6)에 속도센서(7)와 전류센서(8) 및 전압센서(9)가 연결설치되고, 상기 센서들로부터 측정된 매 순간 구동기(6)의 속도와 전류 및 전압값 데이터가 예컨대 컴퓨터와 같은 품질평가장치(10)로 보내어져서 그때의 주편에 작용하는 실제 인발력이 계산되고 계산된 실제 인발력이 기입력되어 있는 이론적 인발력과 비교되어 주편의 품질이 평가되도록 장치가 구성된다.According to the present invention, the speed sensor 7 and the current sensor 8 and the voltage sensor 9 are connected and installed in the driver 6, and the speed and current of the driver 6 measured at each moment from the sensors and The voltage value data is sent to the quality evaluation device 10 such as a computer, for example, so that the actual pulling force acting on the cast steel at that time is calculated, and the calculated actual pulling force is compared with the input theoretical theoretical force to evaluate the quality of the cast steel. It is composed.

상기 구동롤(2)을 통해 주편(5)에 작용하는 실제 인발력은 상기 구동롤(2)을 구동시키는 구동기(6)의 출력토크로부터 구해질 수 있으며, 이 출력토크는 다음과 같은 관계를 이용하여 구할 수 있다.The actual drawing force acting on the slab 5 through the driving roll 2 can be obtained from the output torque of the driver 6 for driving the driving roll 2, and this output torque is obtained using the following relationship. Can be obtained by

즉, 구동기(6)의 입력 전압을 V, 입력 전류를 A, 속도(rpm)를 W, 출력토크를 T, 효율을 μ라고 하면, 상기 구동기(6)의 입력파워 P는 다음 식(1)과 같이 된다.That is, if the input voltage of the driver 6 is V, the input current is A, the speed (rpm) is W, the output torque is T, and the efficiency is μ, the input power P of the driver 6 is expressed by the following equation (1). Becomes

Figure 1019970075868_B1_M0001
Figure 1019970075868_B1_M0001

따라서, 구하고자 하는 출력토크 T는,Therefore, the output torque T to be obtained is

Figure 1019970075868_B1_M0002
Figure 1019970075868_B1_M0002

의 관계식으로부터 구해질 수 있으며, 이 구동기(6)의 출력토크를 이용하여 주편의 실제 인발력을 계산한다.The actual torque of the cast steel can be calculated using the output torque of the actuator 6.

한편, 상기의 실제 인발력과 비교되는 이론적 인발력은 잘 알려져 있는 바와 같이 몰드(1)내에서의 마찰력, 철정압(Ferostatic Pressure), 벌징(Bulging)에 의한 인발저항, 롤 벤딩(Roll Bending)에 의한 인발저항, 스트랜드(4)의 스트레이트닝영역(Straightening Zone)에서의 인발저항 등의 인자들을 고려하여 구해질 수 있다. 예컨대, 이러한 연속주조설비에 있어서는 몰드 탕면으로부터 수직위치에 따라 주편내 용강의 압력이 변화하고, 이 압력에 의해 미응고 용강이 존재하는 세그멘트(3)의 각 구동롤(2)에 철정압이 작용하게 되는 바, 이 철정압은 잘 알려진 계산식으로부터 구해질 수 있고, 상기 철정압으로 인한 주편과 롤간의 인발저항을 계산하여 이론적인 주편 인발력 계산에 산입한다. 또한, 연속주조에 있어서 주편의 표면은 철정압과 자중에 의하여 구동롤(2)들사이에서 볼록하게 변형되는데 이를 벌징이라고 하며, 이러한 벌징에 의한 인발저항도 잘 알려진 방법으로 계산될 수 있다.On the other hand, the theoretical drawing force compared with the actual drawing force is, as is well known, the frictional force in the mold 1, the positive static pressure (Ferostatic pressure), the pull-out resistance by bulging (Bulging), the roll bending (Roll Bending) Factors such as drawing resistance and drawing resistance in the straightening zone of the strand 4 can be obtained. For example, in such a continuous casting facility, the pressure of molten steel in a slab changes from a mold hot water surface to a vertical position, and an iron positive pressure acts on each driving roll 2 of the segment 3 in which unsolidified molten steel exists by this pressure. This iron static pressure can be obtained from a well-known calculation formula and calculates the pull resistance between the cast steel and the roll due to the iron static pressure and calculates the theoretical cast steel pulling force. In addition, in continuous casting, the surface of the cast steel is convexly deformed between the driving rolls 2 by the positive static pressure and its own weight, which is called bulging, and the drawing resistance by such bulging can also be calculated by a well-known method.

위와 같이 계산된 이론적 인발력과 실제의 현장설비에서 상술한 본 발명의 장치를 통해 측정되는 실제 인발력이 품질평가장치(10)에서 비교되고, 비교결과 측정된 실제 인발력이 이론상의 이상적 인발력에 근사하게 접근되면 예컨대 냉간압연용의 양질의 강재로 평가하고, 상기 실제 인발력이 이론 인발력으로부터 설정치이상으로 벗어나 있는 경우는 예컨대 열간압연용으로 쓰일 수 있는 저급의 강재로 평가한다.The theoretical pullout force calculated as described above and the actual pullout force measured by the apparatus of the present invention as described above in the actual field equipment are compared in the quality evaluation apparatus 10, and the actual pullout force measured as a result of the comparison approximates the theoretical ideal pullout force. If it is, for example, it is evaluated as a high quality steel for cold rolling, and if the actual drawing force deviates from the theoretical drawing force by more than a set value, it is evaluated as a low grade steel that can be used for hot rolling, for example.

이상에서 상세히 설명한 바와 같은 본 발명은 연속주조설비에 있어서 주편을 안내인발하는 구동롤(2)을 구동시키는 구동기(6)의 출력토크로부터 주편에 작용하는 실제 인발력을 측정하고 이를 이론적인 인발력과 비교하는 간단하면서도 효율적인 방법에 의해 주편의 품질을 보다 신속,정확하게 평가할 수 있는 효과를 제공한다.The present invention as described in detail above measures the actual drawing force acting on the slab from the output torque of the driver 6 for driving the driving roll 2 for guiding the cast in the continuous casting facility and compare it with the theoretical drawing force It provides a simple and efficient way to evaluate cast iron quality more quickly and accurately.

Claims (2)

구동롤(2)들을 가진 복수의 세그멘트(3)들을 몰드(1)하방에 설치구비하여 주편의 연속주조를 행하는 연속주조설비에 있어서, 상기 구동롤(2)을 구동시키는 구동기(6)의 속도와 입력 전류 및 전압의 크기를 측정하여 이로부터 주편에 작용하는 실제 인발력을 계산하는 단계와, 몰드내에서의 마찰력, 철정압, 벌징 등의 요인에 의한 인발저항을 구하여 이로부터 이론적인 인발력을 계산하는 단계와, 상기 실제 인발력 및 이론적 인발력을 비교하여 주편의 품질을 평가하는 단계를 포함하는 것을 특징으로 하는 연속주조설비의 주편 품질평가 방법.In a continuous casting facility in which a plurality of segments (3) having drive rolls (2) are installed under the mold (1) to continuously cast the slab, the speed of the driver (6) for driving the drive roll (2) And calculating the actual drawing force acting on the cast steel by measuring the magnitude of the input current and voltage, and calculating the theoretical drawing force from the pull resistance caused by factors such as friction, iron static pressure and bulging in the mold. And evaluating the quality of the cast steel by comparing the actual pulling force and the theoretical pull force. 구동롤(2)들을 가진 복수의 세그멘트(3)들을 몰드(1)하방에 설치구비하여 주편의 연속주조를 행하는 연속주조설비에 있어서, 상기 구동롤(2)을 구동시키는 구동기(6)의 속도와 입력 전류 및 전압의 크기를 측정하도록 구동기(6)에 연결설치된 속도센서(7), 전류센서(8), 전압센서(9)와, 상기 센서들로부터의 측정값 데이터를 전송받아 그때의 주편에 작용하는 실제 인발력을 계산하고 그 실제 인발력을 기입력된 이론적 인발력과 비교하여 주편의 품질평가를 행하도록 구성된 품질평가장치(10)를 포함하는 구성을 특징으로 하는 연속주조설비의 주편 품질평가 장치.In a continuous casting facility in which a plurality of segments (3) having drive rolls (2) are installed under the mold (1) to continuously cast the slab, the speed of the driver (6) for driving the drive roll (2) And the speed sensor (7), current sensor (8), and voltage sensor (9) connected to the driver (6) to measure the magnitude of the input current and voltage, and the measured value data from the sensors. A quality evaluation device for a continuous casting machine characterized by including a quality evaluation device (10) configured to calculate the quality of the cast steel by calculating the actual pulling force acting on the steel sheet and comparing the actual pulling force with a previously input theoretical pulling force. .
KR1019970075868A 1997-12-29 1997-12-29 Method and apparatus for evaluating quality of slab in continuous casting line KR100309783B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100870772B1 (en) * 2002-08-29 2008-11-26 재단법인 포항산업과학연구원 Method for estimating the quality of slab

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100870772B1 (en) * 2002-08-29 2008-11-26 재단법인 포항산업과학연구원 Method for estimating the quality of slab

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