KR20000045536A - Apparatus and method for compensation heat treating different kind of strip in continuous furnace - Google Patents

Apparatus and method for compensation heat treating different kind of strip in continuous furnace Download PDF

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KR20000045536A
KR20000045536A KR1019980062096A KR19980062096A KR20000045536A KR 20000045536 A KR20000045536 A KR 20000045536A KR 1019980062096 A KR1019980062096 A KR 1019980062096A KR 19980062096 A KR19980062096 A KR 19980062096A KR 20000045536 A KR20000045536 A KR 20000045536A
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South Korea
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strip
continuous annealing
annealing furnace
furnace
trailing
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KR1019980062096A
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Korean (ko)
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김근영
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이구택
포항종합제철 주식회사
신현준
재단법인 포항산업과학연구원
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Priority to KR1019980062096A priority Critical patent/KR20000045536A/en
Publication of KR20000045536A publication Critical patent/KR20000045536A/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/562—Details

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

PURPOSE: An apparatus and a method are provided, for compensation heat treating a different kind of strip, or first and following strips with different thickness based on the welding point (7) in continuous furnace. CONSTITUTION: A different kind of strip is heat treated by heat treating the following strip (5) in a continuous furnace (1) after compensation heating the following strip (5) in an entrance dynamic furnace (2) with transferring it by the transfer velocity equal to that of the first strip (4) if the following strip (5) is thicker than the first strip (4); or heat treating the following strip (5) in a continuous furnace (1) after modifying the transfer velocity if the first strip (4) is thicker than the following strip (5), and compensation heating the rear part of the first strip (4) which has passed the continuous furnace (1) by the transfer velocity equal to that of the following strip (4) in an exit dynamic furnace (3).

Description

연속소둔로에서의 이종스트립 보상열처리장치 및 방법Dissimilar Strip Compensation Heat Treatment Apparatus and Method in Continuous Annealing Furnace

본 발명은 연속소둔로에서의 이종스트립 보상열처리장치 및 방법에 관한 것으로, 특히 연속소둔로의 입출측에 각각 설치된 급속가열로(Dynamic Furnace)를 이용하여 용접점을 기준으로 그 두께를 달리하는 이종스트립에 보상가열을 실시함으로써 이종스트립의 전후측에 발생되는 불합리한 열처리구간을 최소화할 수 있는 연속소둔로에서의 이종스트립 보상열처리장치 및 방법에 관한 것이다.The present invention relates to a heterostrip strip compensation heat treatment apparatus and method in a continuous annealing furnace, and in particular, a heterogeneous sheet having a different thickness based on a welding point using a dynamic furnace installed at each entry side of the continuous annealing furnace. The present invention relates to a heterostrip strip compensation heat treatment apparatus and method in a continuous annealing furnace capable of minimizing irrational heat treatment intervals generated on the front and rear sides of a hetero strip by performing compensation heating on the strip.

일반적으로, 냉연설비의 연속소둔로는 예열대, 가열대, 균열대, 서냉대, 급냉대, 저온보지대(과시효대), 최종냉각대, 수냉대 등으로 구성되어 있다.In general, the continuous annealing furnace of the cold rolling equipment is composed of a preheating zone, a heating zone, a cracking zone, a slow cooling stand, a quenching stand, a low temperature support stand (overaging zone), a final cooling stand, a water cooling stand, and the like.

이때, 일정한 로온을 유지하는 연속소둔로에는 서로 용접으로 이어진 스트립이 통과되면서 연속적으로 열처리된다.At this time, the continuous annealing furnace to maintain a constant low temperature is continuously heat treated while passing the strips connected to each other by welding.

여기서, 용접부를 기준하여 선후행스트립의 두께를 달리할 경우 연속소둔로의 통과속도도 그 스트립의 두께에 따라 차등적용되어야 스트립의 정상적인 열처리가 가능하다.Here, in the case of varying the thickness of the trailing strip on the basis of the welded part, the pass rate of the continuous annealing furnace must also be differentially applied according to the thickness of the strip to enable normal heat treatment of the strip.

이를테면, 선행스트립의 두께가 후행스트립의 두께보다 두꺼울 경우, 연속소둔로의 스트립 통과속도는 상대적으로 두꺼운 선행스트립에 맞추어져 있기 때문에 이 통과속도를 그대로 후행스트립에 적용할 경우 후행스트립은 과열처리가 된다.For example, if the thickness of the preceding strip is thicker than the thickness of the trailing strip, since the strip passing speed of the continuous annealing furnace is set to the relatively thick preceding strip, if the passing speed is applied to the trailing strip as it is, the trailing strip is overheated. do.

따라서, 이와같은 경우에는 연속소둔로의 스트립 통과속도를 후행스트립의 두께에 맞도록 보다 빠른 속도로 진행시켜야 한다.Therefore, in such a case, the strip passage speed of the continuous annealing furnace should be advanced at a higher speed to match the thickness of the trailing strip.

반대로, 선행스트립의 두께가 후행스트립의 두께보다 얇을 경우, 연속소둔로의 스트립 통과속도는 상대적으로 얇은 선행스트립에 맞추어져 있기 때문에 이 통과속도를 그대로 후행스트립에 적용할 경우 후행스트립은 목표온도이하로 열처리가 된다.On the contrary, if the thickness of the preceding strip is thinner than the thickness of the trailing strip, the strip passing speed of the continuous annealing furnace is set to the relatively thin preceding strip, so if the passing speed is applied to the trailing strip as it is, the trailing strip is below the target temperature. Heat treatment.

따라서, 이와같은 경우에는 연속소둔로의 스트립 통과속도를 후행스트립의 두께에 맞도록 보다 느린 속도로 진행시켜야 한다.Therefore, in such a case, the strip passing speed of the continuous annealing furnace should be progressed at a slower speed to match the thickness of the trailing strip.

그러나, 용접점을 기준하여 두께를 달리하는 선후행스트립에는 어느시점에 연속소둔로의 통과속도를 변경하여도 부적절한 열처리구간이 발생된다.However, in the trailing strip having a different thickness based on the welding point, an inappropriate heat treatment section occurs even when the passage speed of the continuous annealing furnace is changed at any point in time.

가령, 선행스트립의 두께가 후행스트립의 두께보다 얇은 경우, 그 용접점이 연속소둔로의 입구측에서 감지되는 즉시 후행스트립에 맞추어 그 통과속도를 느리게 조정하면 연속소둔로에서 열처리중인 선행스트립의 후단부는 과열처리가 된다.For example, if the thickness of the preceding strip is thinner than the thickness of the trailing strip, as soon as the welding point is detected at the inlet side of the continuous annealing furnace, if the passage speed is slowly adjusted to the trailing strip, the rear end of the preceding strip being heat treated in the continuous annealing furnace It is overheated.

반대로, 선행스트립의 두께가 후행스트립의 두께보다 얇은 경우, 그 용접점이 연속소둔로의 출구측에서 감지되는 즉시 후행스트립에 맞추어 그 통과속도를 느리게 조정하면 연속소둔로에서 열처리중인 후행스트립의 선단부는 목표온도이하로 열처리가 된다.On the contrary, if the thickness of the preceding strip is thinner than the thickness of the trailing strip, as soon as the welding point is detected at the exit side of the continuous annealing furnace, the speed of the trailing strip is slowly adjusted to the trailing strip. Heat treatment is below the target temperature.

본 발명은 연속소둔로의 입출측에 각각 설치된 급속가열로(Dynamic Furnace)를 이용하여 선후행스트립에 보상가열을 실시함으로써 선후행스트립의 전후단부에 발생되는 불합리한 열처리구간을 최소화할 수 있는 연속소둔로에서의 이종스트립 열처리장치 및 방법을 제공함에 그 목적이 있다.According to the present invention, continuous annealing can be performed to minimize irrational heat treatment zones generated at the front and rear ends of the trailing strip by performing compensation heating on the trailing strip using dynamic furnaces respectively installed on the entry side of the continuous annealing furnace. It is an object of the present invention to provide an apparatus and method for dissipating heat strips in a furnace.

도1은 본 발명에 따른 이종스트립 보상열처리장치가 장착된 연속소둔로설비를 나타내는 개략도,1 is a schematic view showing a continuous annealing furnace equipment equipped with a hetero strip compensation heat treatment apparatus according to the present invention;

도2는 입측급속가열로에서 보상열처리시 각 구간별 이종스트립의 열처리온도변화를 나타내는 그래프,Figure 2 is a graph showing the heat treatment temperature change of the heterostrip for each section during compensation heat treatment in the entry rapid heating furnace,

도3은 출측급속가열로에서 보상열처리시 각 구간별 이종스트립의 열처리온도변화를 나타내는 그래프이다.3 is a graph showing the heat treatment temperature change of the heterostrip for each section during compensation heat treatment in the exit rapid heating furnace.

〈도면의 주요부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>

1: 연속소둔로 2: 입측급속가열로 3: 출측급속가열로 4: 선행스트립 5: 후행스트립 6: 용접점감지기 7: 용접점1: continuous annealing furnace 2: entry rapid heating furnace 3: exit rapid heating furnace 4: preceding strip 5: trailing strip 6: welding spot detector 7: welding spot

상기한 목적을 달성하기 위하여 본 발명은 연속소둔로의 입출측에 각각 급속가열로가 용접점을 기준하여 그 두께를 달리하는 선후행스트립을 보상가열하도록 설치되고, 상기 급속가열로의 전방측에 선후행스트립의 용접점을 검출하는 용접점감지기가 설치되는 것을 특징으로 하는 연속소둔로에서의 이종스트립 보상열처리장치를 제공한다.In order to achieve the above object, the present invention is installed on the entry and exit side of the continuous annealing furnace to compensate heating the trailing strip having different thicknesses based on the welding point, respectively, on the front side of the rapid heating furnace. Provided is a heterostrip compensation heat treatment apparatus for a continuous annealing furnace, characterized in that a welding spot detector is provided for detecting a welding spot of a preceding and following strip.

또한, 본 발명은 용접점을 기준하여 그 두께를 달리하는 선후행스트립에 대한 연속소둔로에서의 이종스트립 보상열처리방법에 있어서, 선행스트립보다 후행스트립의 두께가 두꺼운 경우 상기 후행스트립을 선행스트립의 이송속도로 이송시키면서 입측급속가열로에서 보상가열한 후 연속소둔로에서 열처리하거나, 선행스트립이 후행스트립의 두께보다 두꺼운 경우 이송속도를 후행스트립에 맞도록 변경한 후 후행스트립을 연속소둔로에서 열처리하고, 후행스트립의 이송속도로 연속소둔로를 통과한 선행스트립의 후단부를 출측급속가열로에서 보상가열하는 것을 특징으로 하는 연속소둔로에서의 이종스트립 보상열처리방법을 제공한다.In addition, the present invention is a method for compensating heat treatment of a heterostrip strip in a continuous annealing furnace for a trailing strip having a different thickness based on a welding point, wherein the trailing strip is thicker than the preceding strip when the thickness of the trailing strip is thicker than that of the preceding strip. Heated in continuous annealing furnace after compensatory heating in the entrance rapid heating furnace while feeding at the feed rate, or if the preceding strip is thicker than the thickness of the trailing strip, change the feed rate to match the trailing strip and then heat the trailing strip in the continuous annealing furnace. The present invention provides a method for compensating for heterostrip strips in a continuous annealing furnace, wherein the rear end portion of the preceding strip passing through the continuous annealing furnace at a feed rate of the trailing strip is compensated and heated in an exit rapid heating furnace.

도면을 참조하여 본 발명을 상세히 설명한다.The present invention will be described in detail with reference to the drawings.

도1은 본 발명에 따른 이종스트립 보상열처리장치가 장착된 연속소둔로설비를 나타내는 개략도이고, 도2는 입측급속가열로에서 보상열처리시 각 구간별 이종스트립의 열처리온도변화를 나타내는 그래프이며, 도3은 출측급속가열로에서 보상열처리시 각 구간별 이종스트립의 열처리온도변화를 나타내는 그래프이다.Figure 1 is a schematic diagram showing a continuous annealing furnace equipment equipped with a heterostrip strip compensation heat treatment apparatus according to the present invention, Figure 2 is a graph showing the change in the heat treatment temperature of the heterostrip for each section during compensation heat treatment in the entry rapid heating furnace, 3 is a graph showing the change in heat treatment temperature of the hetero strips in each section during compensation heat treatment in the exit rapid heating furnace.

본 발명에서 급속가열로(Dynamic Furnace)(2,3)를 각각 연속소둔로(1)의 입출측에 설치하여 두께를 달리하는 선후행스트립(4,5)이 목표온도에서 열처리되도록 급속가열하게 된다.In the present invention, the rapid heating furnace (Dynamic Furnace) (2,3) is installed on the entry and exit side of the continuous annealing furnace (1), respectively, so that the rapid trailing strip (4,5) of varying thickness is heat-treated at the target temperature do.

즉, 선행스트립(4)의 두께가 후행스트립(5)의 두께보다 얇은 경우, 선후행스트립(4,5)의 용접점(7)이 용접점감지기(6)에서 감지되면서 입측급속가열로(2)에 도달되는 시점에 입측급속가열로를 급속 가열시키게 된다.That is, when the thickness of the preceding strip 4 is thinner than the thickness of the trailing strip 5, the welding spot 7 of the preceding and following strips 4 and 5 is detected by the welding spot detector 6, and the entrance rapid heating furnace ( At the point of reaching 2), the rapid heating furnace is heated rapidly.

이때, 도2에 도시한 바와같이 상대적으로 두께가 두꺼운 후행스트립(5)은 연속소둔로(1)를 통과하기 전에 입측급속가열로(2)에서 일정온도까지 급속가열되기 때문에 연속소둔로를 선행스크립(4)의 이송속도로 빠르게 통과하여도 목표온도로 열처리가 가능하게 된다.At this time, as shown in FIG. 2, the relatively thick trailing strip 5 is preceded by the continuous annealing furnace because it is rapidly heated up to a constant temperature in the entrance rapid heating furnace 2 before passing through the continuous annealing furnace 1. Even if it passes quickly at the feed rate of the script 4, heat treatment is possible at the target temperature.

여기서, 선후행스트립(4,5)의 용접점(7)이 용접점감지기(6)에서 감지되면서 입측급속가열로(2)에 도달되는 시점에 입측급속가열로가 가열을 시작하기 때문에 입측급속가열로를 미처 통과하지 못한 선행스트립(4)의 후단부는 과열처리가 되지만, 이 구간은 종래에 발생되는 선행스트립의 과열처리구간에 비하여 현저히 적은 양이다.Here, the welding speed 7 of the leading and trailing strips 4 and 5 is detected by the welding spot detector 6, and the entrance rapid heating furnace starts heating at the point of time when the entrance rapid heating furnace 2 is reached. The rear end of the preceding strip 4 which has not passed through the furnace is subjected to overheating, but this section is significantly smaller than the conventional overheating section of the preceding strip.

한편, 선행스트립(4)의 두께가 후행스트립(5)보다 상대적으로 두꺼운 경우, 그 용접점(7)이 용접점감지기(6)에서 감지된 후, 다시 연속소둔로(1)에 도달하기 전까지 스트립의 이송속도를 서서히 증가시켜 후행스트립(5)의 이송속도로 조절하게 된다.On the other hand, if the thickness of the preceding strip 4 is relatively thicker than the trailing strip 5, after the welding point 7 is detected by the welding spot detector 6, the welding strip 7 until the continuous annealing furnace 1 is reached again. The feed rate of the strip is gradually increased to adjust the feed rate of the trailing strip 5.

그리고, 용접점(7)이 용접점감지기(6)에 감지되는 순간부터 출측급속가열로(3)를 서서히 가열시켜 서서히 보다 빠른 속도로 연속소둔로(1)를 통과한 선행스트립(4)의 후단부를 가열시키게 된다.Then, from the moment the welding spot 7 is detected by the welding spot detector 6, the exit rapid heating furnace 3 is gradually heated to gradually pass the continuous annealing furnace 1 at a higher speed. The rear end is heated.

이는, 용접점(7)이 용접점감지기(6)에 감지되는 순간 스트립의 이송속도를 서서히 빠르게 조정된 후 다시 용접점이 연속소둔로(1)에 도달하는 시점에서 스트립의 이송속도는 후행스트립(5)의 이송속도로 맞추어지게 된다.This is because, when the welding point 7 is detected by the welding point sensor 6, the feed rate of the strip is gradually adjusted quickly, and then again, at the time when the welding point reaches the continuous annealing furnace 1, the feeding rate of the strip is a trailing strip ( It will be set at the feed rate of 5).

따라서, 스트립의 이송속도를 조절하는 동안 연속소둔로(1)를 통과하는 선행스트립(4)의 후단부는 목표온도이하로 열처리되고, 용접점(7)이 용접점감지기(6)에 감지되는 순간부터 출측급속가열로(3)를 서서히 가열시키면서 연속소둔로를 통과하는 선행스트립의 후단부에 대해 보상열처리를 시작하고 용접점이 출축급속가열로에 도착할 때즈음 출측급속가열로의 가열을 순간적으로 멈추게 된다.Therefore, the rear end of the preceding strip 4 passing through the continuous annealing furnace 1 during the adjusting of the feed rate of the strip is heat-treated below the target temperature, and the moment when the welding point 7 is detected by the welding point detector 6 The heating of the exit rapid heating furnace (3) is started gradually and the compensation heat treatment is started for the rear end of the preceding strip passing through the continuous annealing furnace, and the heating of the exit rapid heating furnace is momentarily stopped when the welding point arrives at the exit rapid heating furnace. do.

이때, 도1에 도시한 바와같이 상대적으로 두께가 두꺼운 선행스트립(4)은 그 후단부가 후행스트립(5)의 이송속도로 연속소둔로(1)를 통과하기 때문에 목표온도이하로 열처리된다.At this time, as shown in Figure 1, the relatively thick leading strip 4 is heat-treated below the target temperature because its rear end passes through the continuous annealing furnace 1 at the feed rate of the trailing strip 5.

따라서, 후행스트립(5)의 이송속도로 연속소둔로(1)를 통과한 선행스트립(4)의 후단부는 출측급속가열로(3)를 통과하면서 목표온도까지 보상열처리된다.Therefore, the rear end of the preceding strip 4 which has passed through the continuous annealing furnace 1 at the feed rate of the trailing strip 5 is subjected to the compensation heat treatment up to the target temperature while passing through the exit rapid heating furnace 3.

그리고, 본 발명에서 사용되는 급속가열로(Dynamic Furnace)(2,3)는 환상솔레노이드코일에 의한 유도가열방식이나 통전롤에 의한 스트립저항가열방식이 사용될 수 있고, 용접점감지기(6)는 투광기에서 투광된 빛이 용접점(7)을 통해 수광기에 수신되면 작동되는 구조로 이루어져 있다.In addition, the rapid furnace (Dynamic Furnace) (2,3) used in the present invention may be an induction heating method using a cyclic solenoid coil or a strip resistance heating method using an energizing roll, the welding spot detector (6) is a transmitter When the light transmitted from is received by the receiver through the welding point (7) consists of a structure that is operated.

본 발명은 연속소둔로의 입출측에 각각 설치된 급속가열로(Dynamic Furnace)를 이용하여 두께를 달리하는 선후행스트립에 대해 목표온도까지 보상열처리를 실시함으로써 선후행스트립의 전후단부에 발생되는 불합리한 열처리구간을 최소화할 수 있는 효과를 제공하게 된다.According to the present invention, irrational heat treatment is generated at the front and rear ends of the trailing strip by performing a compensation heat treatment up to a target temperature for the trailing strip having different thicknesses by using a dynamic furnace installed on the entry side of the continuous annealing furnace. It provides an effect that can minimize the interval.

Claims (2)

연속소둔로(1)의 입출측에 각각 급속가열로(2,3)가 용접점(7)을 기준하여 그 두께를 달리하는 선후행스트립(4,5)을 보상가열하도록 설치되고, 상기 급속가열로(2)의 전방측에 선후행스트립(4,5)의 용접점(7)을 검출하는 용접점감지기(6)가 설치되는 것을 특징으로 하는 연속소둔로에서의 이종스트립 보상열처리장치.Rapid heating furnaces 2 and 3 are respectively installed on the entry and exit side of the continuous annealing furnace 1 so as to compensate heating the trailing strips 4 and 5 having different thicknesses based on the welding point 7. A heterostrip compensation heat treatment apparatus for a continuous annealing furnace, characterized in that a welding point detector (6) is provided at the front side of the heating furnace (2) to detect the welding point (7) of the preceding and following strips (4, 5). 용접점(7)을 기준하여 그 두께를 달리하는 선후행스트립(4,5)에 대한 연속소둔로에서의 이종스트립 보상열처리방법에 있어서,In the heterostrip compensation heat treatment method in the continuous annealing furnace for the trailing strips 4 and 5 whose thicknesses are different with respect to the welding point 7, 선행스트립(4)보다 후행스트립(5)의 두께가 두꺼운 경우 상기 후행스트립(5)을 선행스트립(4)의 이송속도로 이송시키면서 입측급속가열로(2)에서 보상가열한 후 연속소둔로(1)에서 열처리하거나, 선행스트립(5)이 후행스트립(5)의 두께보다 두꺼운 경우 이송속도를 후행스트립(5)에 맞도록 변경한 후 후행스트립(5)을 연속소둔로(1)에서 열처리하고, 후행스트립(5)의 이송속도로 연속소둔로(1)를 통과한 선행스트립(4)의 후단부를 출측급속가열로(3)에서 보상가열하는 것을 특징으로 하는 연속소둔로에서의 이종스트립 보상열처리방법.When the thickness of the trailing strip 5 is thicker than that of the preceding strip 4, the trailing strip 5 is transported at the feed rate of the preceding strip 4 while the compensation heating is performed in the entrance rapid heating furnace 2, and then the continuous annealing furnace ( Heat treatment in 1) or if the preceding strip 5 is thicker than the thickness of the trailing strip 5, the feed rate is changed to match the trailing strip 5, and then the trailing strip 5 is heat-treated in the continuous annealing furnace 1 And dissimilar strips in the continuous annealing furnace, characterized in that the rear end portion of the preceding strip (4) passing through the continuous annealing furnace (1) at the feed rate of the following strip (5) is compensated by the exit rapid heating furnace (3). Compensation heat treatment method.
KR1019980062096A 1998-12-30 1998-12-30 Apparatus and method for compensation heat treating different kind of strip in continuous furnace KR20000045536A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101290456B1 (en) * 2011-06-28 2013-07-26 현대제철 주식회사 High strength cold-rolled steel sheet and method of manufacturing the cold-rolled steel sheet

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101290456B1 (en) * 2011-06-28 2013-07-26 현대제철 주식회사 High strength cold-rolled steel sheet and method of manufacturing the cold-rolled steel sheet

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