KR100942099B1 - Method for removing contaminant from ceramic hearth roll - Google Patents
Method for removing contaminant from ceramic hearth roll Download PDFInfo
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- KR100942099B1 KR100942099B1 KR1020060049456A KR20060049456A KR100942099B1 KR 100942099 B1 KR100942099 B1 KR 100942099B1 KR 1020060049456 A KR1020060049456 A KR 1020060049456A KR 20060049456 A KR20060049456 A KR 20060049456A KR 100942099 B1 KR100942099 B1 KR 100942099B1
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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
- C21D9/563—Rolls; Drums; Roll arrangements
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
- F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/02—Skids or tracks for heavy objects
- F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails
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- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
본 발명은 세라믹 허스롤 표면부 이물질 제거방법에 관한 것으로, 강판의 진행 경로를 따라 일정 간격 떨어져 여러 개의 허스롤이 배치된 소둔로에서 허스롤의 표면에 부착된 이물질을 제거하는 방법에 있어서, 상기 강판의 진행 속도를 100mpm이라 할 때, 상기 강판의 진행 속도를 유지시키면서 상기 강판의 진행 경로를 따라 형성되는 가열대, 균열대, 환원대 및 냉각대에 배치되는 허스롤의 회전 속도를 97∼98mpm, 98∼99mpm, 99∼100mpm 및 100∼101mpm의 범위에 있도록 설정하며, 이러한 구성에 의하면 조업을 중단하지 않은 상태에서 허스롤의 회전 속도를 가열대, 균열대, 환원대 및 냉각대 별로 다르게 설정하여 허스롤 표면부의 이물질을 효과적으로 제거할 수 있다.The present invention relates to a method for removing foreign matter on the surface of a ceramic hearth roll, the method for removing foreign matter attached to the surface of a hearth roll in an annealing furnace in which a plurality of hearth rolls are arranged at a predetermined interval along a traveling path of a steel sheet. When the traveling speed of the steel sheet is 100mpm, the rotational speed of the hearth roll disposed in the heating table, the cracking zone, the reducing zone, and the cooling zone formed along the traveling path of the steel sheet while maintaining the traveling speed of the steel sheet is 97-98mpm, 98 to 99mpm, 99 to 100mpm and 100 to 101mpm range. According to this configuration, the rotation speed of the hearth roll is set differently for the heating table, the cracking zone, the reducing zone, and the cooling zone without interruption of operation. Foreign matter can be effectively removed from the roll surface portion.
연속소둔, 세라믹 허스롤, 브러싱, 강판, 온라인 Continuous Annealed, Ceramic Hearth Roll, Brushing, Steel Sheet, Online
Description
도1은 통상의 연속 소둔설비를 개략적으로 도시한 도면;1 schematically shows a conventional continuous annealing plant;
도2에는 종래의 고온 소둔로가 갖는 문제점을 설명하기 위한 도면;2 is a view for explaining a problem with a conventional high temperature annealing furnace;
도3은 본 발명에 따른 세라믹 허스롤 표면부 이물질 제거방법에 사용되는 소둔로의 구성을 나타낸 개략 구성도;Figure 3 is a schematic block diagram showing the configuration of the annealing furnace used in the method for removing foreign matter on the ceramic hearth roll surface portion according to the present invention.
도4는 본 발명의 주요 구성을 설명하기 위한 도면이다.4 is a view for explaining the main configuration of the present invention.
※도면의 주요부분에 대한 부호의 설명※※ Explanation of symbols about main part of drawing ※
10 : 소둔로10: annealing furnace
11 : 강판11: steel sheet
12 : 허스롤12: hearth roll
13 : 구동모터13: drive motor
본 발명은 세라믹 허스롤 표면부 이물질 제거방법에 관한 것으로서, 보다 상세하게는 조업을 중단하지 않은 상태에서 허스롤의 회전 속도를 가열대, 균열대, 환원대 및 냉각대 별로 다르게 설정하여 허스롤 표면부의 이물질을 제거할 수 있는 세라믹 허스롤 표면부 이물질 제거방법에 관한 것이다.The present invention relates to a method for removing foreign matter from the surface of a ceramic hearth roll, and more specifically, by setting the rotational speed of the hearth roll differently for each heating zone, cracking zone, reducing zone, and cooling zone without interruption of operation. The present invention relates to a method for removing foreign matters from the surface of a ceramic hearth roll capable of removing foreign matters.
일반적으로 안정기와 같은 전기기기에 사용되는 고타발성(Glassless)의 방향성 전기강판의 소둔 작업은 850∼1,300℃의 고온조건을 갖도록 형성된 소둔로에서 수행되며, 대개 0.28∼0.5㎜ 정도의 두께를 갖는 강판이 소둔로의 내부에 설치된 허스롤을 따라 진행하게 된다.In general, annealing of highly oriented electrical steel sheets used in electrical equipment such as ballasts is performed in an annealing furnace formed to have a high temperature condition of 850 to 1,300 ° C., and usually has a thickness of about 0.28 to 0.5 mm. Proceed along the hearth roll installed inside the annealing furnace.
이러한 허스롤의 표면에는 강판과의 접촉으로 인해 산화스케일 등의 이물질이 부착된다.On the surface of such a hearth roll, foreign matters such as an oxide scale adhere to the surface of the hearth roll.
도1은 일반적인 고온 소둔로의 구성을 개략적으로 나타낸 구성도로서, 수평식 고온 소둔로(20)의 내부에 강판(21)의 진행 방향을 따라 일정 간격 떨어져 여러 개의 허스롤(22)이 배치되며, 이들 허스롤(22)은 체인(24)에 의해 함께 회전하도록 연결되어 모터(23)에 의해 회전되는 구성을 갖는다.1 is a schematic view showing a configuration of a general high temperature annealing furnace, in which a plurality of
도2에는 종래의 고온 소둔로가 갖는 문제점을 설명하기 위한 도면으로, 허스롤(22)의 표면에 이물질(S1)이 부착되고, 이러한 허스롤(22)을 통과하는 강판(21)의 표면에는 상기 이물질(S1)에 의해 이물마크(S2)가 형성된 것을 보인다.2 is a view for explaining the problem of the conventional high temperature annealing furnace, foreign matter (S1) is attached to the surface of the
이와 같이 강판의 표면에 발생된 이물마크는, 절연성 확보를 위해 절연코팅되는 강판의 표면에 공간부를 형성시켜 코팅용액의 부착성을 저하시키며, 나아가 응력제거를 위한 예비 소둔처리 및 코어로 타발가공시 절연코팅층이 쉽게 박리될 뿐만 아니라 다수 적층되는 코어 간의 밀착성(점적율)이 현저히 떨어져 와전류 손실이 발생되는 등의 문제점이 있었다.The foreign material mark generated on the surface of the steel sheet thus forms a space portion on the surface of the steel sheet to be insulated to ensure insulation, thereby lowering the adhesion of the coating solution, and further preliminary annealing for stress relief and punching into the core. Not only the insulation coating layer is easily peeled off, but also the adhesion (drop ratio) between the cores stacked a lot, there is a problem that the eddy current loss occurs.
종래에는 이러한 문제점을 해결하기 위하여, 연속적으로 제품 생산시와 동일한 소둔조건 즉, 가열대 880∼900℃, 균열대 855~860℃, 환원대 650~700℃, 냉각대 150~300℃로 각각 설정하고, 이슬점: 70∼80℃, 수소 50vol% 및 질소 50vol% 정도인 산화성 분위기가스 조건 하에서 브러싱 강판(두께 0.8∼0.95t)을 소둔로 내에 투입하여 라인을 정지한 후, 허스롤을 20∼30mpm(분당 강판 이동거리) 정도의 저속으로 정방향(즉, 강판의 진행방향) 회전시킴으로써 허스롤 상단에 위치한 브러싱 강판과의 마찰력에 의해 허스롤 표면에 고착되어 있는 이물질이 제거되도록 하고 있었다.Conventionally, in order to solve this problem, the same annealing conditions as in the production of the product are continuously set, that is, the heating table 880 ~ 900 ℃, cracking zone 855 ~ 860 ℃, reducing zone 650 ~ 700 ℃, cooling table 150 ~ 300 ℃ , Dew point: 70 to 80 ° C, brushed steel sheet (thickness 0.8 to 0.95t) in an annealing furnace under oxidizing atmosphere gas conditions of about 50 vol% hydrogen and 50 vol% nitrogen, and after stopping the line, the hearth roll was 20 to 30 mpm ( By rotating in the forward direction (that is, the moving direction of the steel sheet) at a low speed of about a minute per minute, the foreign matter adhering to the surface of the hearth roll was removed by the frictional force with the brushed steel sheet located at the top of the hearth roll.
그러나, 이 경우, 브러싱 강판의 반복사용에 따라 강판재질의 연화가 발생되고 이로 인해 소둔로내 브러싱 강판의 장력제어가 곤란하며 브러싱 작업 중 강판이 쉽게 파손되는 문제점이 있었다.However, in this case, softening of the steel sheet material occurs due to repeated use of the brushed steel sheet, which makes it difficult to control the tension of the brushed steel sheet in the annealing furnace and the steel sheet is easily broken during the brushing operation.
또한, 라인 정지 후 브러싱 작업이 진행되므로, 그 횟수가 증가함에 따라 생산성이 현저히 떨어지는 문제점이 있었다.In addition, since the brushing operation is performed after the line stop, there is a problem that productivity is remarkably decreased as the number thereof increases.
또한, 브러싱 작업을 자주할 경우 세라믹 허스롤 표면에 특수코팅된 코팅층이 조기에 손상되어 허스롤 교환주기를 단축시키는 문제점이 있었다.In addition, when the brushing operation is frequently performed, there is a problem in that the coating layer coated on the surface of the ceramic hearth roll is damaged prematurely, thereby shortening the hearth roll exchange cycle.
따라서, 본 발명은 상기한 종래의 문제점을 해결하기 위한 것으로서, 조업을 중단하지 않은 상태에서 허스롤의 회전 속도를 가열대, 균열대, 환원대 및 냉각대 별로 다르게 설정하여 허스롤 표면부의 이물질을 제거할 수 있는 세라믹 허스롤 표면부 이물질 제거방법을 제공하는 것을 그 목적으로 한다.Accordingly, the present invention is to solve the above-mentioned conventional problems, by setting the rotational speed of the hearth roll differently for each heating zone, cracking zone, reducing zone and cooling zone without interrupting the operation to remove foreign matter on the surface of the hearth roll. It is an object of the present invention to provide a method for removing foreign matter from the surface of a ceramic hearth roll.
상기한 목적을 달성하기 위한 기술적인 구성으로서, 본 발명은, 강판의 진행 경로를 따라 일정 간격 떨어져 여러 개의 허스롤이 배치된 소둔로에서 허스롤의 표면에 부착된 이물질을 제거하는 방법에 있어서, 상기 강판의 진행 속도를 100mpm이라 할 때, 상기 강판의 진행 속도를 유지시키면서 상기 강판의 진행 경로를 따라 형성되는 가열대, 균열대, 환원대 및 냉각대에 배치되는 허스롤의 회전 속도를 97∼98mpm, 98∼99mpm, 99∼100mpm 및 100∼101mpm의 범위에 있도록 설정함을 특징으로 하는 세라믹 허스롤 표면부 이물질 제거방법을 마련함에 의한다.As a technical configuration for achieving the above object, the present invention, in the method for removing foreign matter adhering to the surface of the hearth roll in the annealing furnace in which a plurality of hearth rolls are arranged at regular intervals along the traveling path of the steel sheet, When the traveling speed of the steel sheet is 100mpm, the rotational speed of the hearth roll disposed in the heating zone, the cracking zone, the reducing zone, and the cooling zone formed along the traveling path of the steel sheet while maintaining the traveling speed of the steel sheet is 97 to 98mpm. And a method for removing foreign matter from the surface of the ceramic hearth roll, which is set so as to be in a range of 98 to 99mpm, 99 to 100mpm and 100 to 101mpm.
이하, 본 발명을 첨부된 도면을 참조하여 보다 상세하게 설명하고자 한다.Hereinafter, with reference to the accompanying drawings, the present invention will be described in more detail.
도3은 본 발명에 따른 세라믹 허스롤 표면부 이물질 제거방법에 사용되는 소둔로의 구성을 나타낸 개략 구성도이다.Figure 3 is a schematic block diagram showing the configuration of the annealing furnace used in the foreign material removal method of the ceramic hearth roll surface portion according to the present invention.
수평식 고온 소둔로(10)의 내부에 강판(11)의 진행 방향을 따라 일정 간격 떨어져 여러 개의 허스롤(12)이 배치되며, 이들 허스롤(12)은 각각 독립적으로 구동되는 구동모터(13)에 의해 회전되도록 연결된다.A plurality of
바람직하게는, 도4에 도시된 것처럼, 각 영역에 설치된 허스롤들이 동일한 구동모터에 의해 함께 회전되도록 연결된다.Preferably, as shown in Fig. 4, the hearth rolls installed in each region are connected to be rotated together by the same drive motor.
즉, 상기 소둔로(10)의 내부에 설치된 허스롤(12)들은 강판의 진행 방향을 따라 가열대에 속하는 영역에 설치된 허스롤(12A)들과, 균열대에 속하는 영역에 설치된 허스롤(12B)들과, 환원대에 속하는 영역에 설치된 허스롤(12C)들과, 냉각대에 속하는 영역에 설치된 허스롤(12D)들로 구분된다.That is, the
그리고, 가열대의 허스롤(12A)들은 가열대 담당 구동모터(13A)에 의해 함께 구동되도록 연결되며, 균열대의 허스롤(12B)들은 균열대 담당 구동모터(13B)에 의해 함께 구동되도록 연결되며, 환원대의 허스롤(12C)들은 환원대 담당 구동모터(13C)에 의해 함께 구동되도록 연결되며, 냉각대의 허스롤(12D)들은 냉각대 담당 구동모터(13D)에 의해 함께 구동되도록 연결된다.Then, the hearth rolls 12A of the heating table are connected to be driven together by the driving motor for the heating table 13A, and the hearth rolls 12B of the cracking table are connected to be driven together by the driving motor 13B for the cracking table and are reduced. The hearth rolls 12C of the stand are connected to be driven together by the drive belt charge motor 13C, and the hearth rolls 12D of the cooling stand are connected to be driven together by the drive motor 13D of the cooling stand.
본 발명의 실시예에서는 강판의 진행 방향을 따라 1번 허스롤부터 3번 허스롤까지, 즉 3개의 허스롤(12A)이 가열대에 배치되고, 4번 허스롤부터 11번 허스롤까지, 즉 8개의 허스롤(12B)이 균열대에 배치되고, 12번 허스롤과 13번 허스롤, 즉 2개의 허스롤(12C)이 환원대에 배치되고, 14번 허스롤부터 16번 허스롤까지, 즉 3개의 허스롤(12D)이 냉각대에 배치된 것을 알 수 있다.In the embodiment of the present invention, from the first roll to the third roll of the hearth roll, that is, the three rolls of the hearth roll 12A are disposed in the heating table and the fourth roll of the hearth roll to the fourth roll of the hearth roll, that is, 8 Two hearth rolls 12B are arranged in the cracking zone, and the 12 hearth rolls and the 13 hearth rolls, that is, the two hearth rolls 12C, are placed in the reduction zone, from the 14th hearth roll to the 16th hearth roll, ie It can be seen that three hearth rolls 12D are arranged in the cooling zone.
본 발명은 이렇게 개별적으로 또는 구간별로 구동되도록 구성된 허스롤들을 구간대별로 적정한 회전수로 회전되게 하여 강판의 처짐 현상을 방지하여 세라믹 허스롤과의 접촉면적을 최소로 한 상태, 즉 점접촉 상태에서 세라믹 허스롤 표면부에 부착된 이물질이 고착되기 전에 제거할 수 있다.In the present invention, the hearth rolls configured to be driven individually or in sections are rotated at an appropriate rotation speed for each section to prevent sagging of the steel sheet so that the contact area with the ceramic hearth roll is minimized, that is, in a point contact state. Foreign matter adhering to the surface of the ceramic hearth roll can be removed before it adheres.
이를 보다 상세하게 설명한다.This will be described in more detail.
소둔라인의 허스롤들은 구간별, 즉 가열대, 균열대, 환원대 및 냉각대별로 동일한 회전 속도를 갖도록 구동모터에 의해 회전 구동된다.The hearth rolls of the annealing line are rotationally driven by the drive motor so as to have the same rotational speed by section, that is, by heating zone, crack zone, reduction zone and cooling zone.
강판의 온라인 속도를 100mpm이라고 할 때, 그 강판의 온라인 속도를 유지하면서, 가열대에 설치된 허스롤(13A)의 회전속도는 97∼98mpm, 균열대에 설치된 허스롤(13B)의 회전속도는 98∼99mpm, 환원대에 설치된 허스롤(13C)의 회전속도는 99 ∼100mpm, 냉각대에 설치된 허스롤(13D)의 회전속도는 100∼101mpm으로 설정한다.When the online speed of the steel sheet is 100mpm, while the online speed of the steel sheet is maintained, the rotation speed of the hearth roll 13A provided in the heating table is 97-98mpm, and the rotation speed of the hearth roll 13B provided in the cracking table is 98-. The rotational speed of the hearth roll 13C provided at 99 mpm and the reduction zone is set to 99 to 100 mpm, and the rotational speed of the hearth roll 13D provided at the cooling zone is set to 100 to 101 mpm.
이렇게 허스롤의 회전속도를 구간별로 서로 다르게 설정하면, 라인을 정지하지 않으면서 강판과 허스롤 사이에 점접촉을 유도하며, 또한 허스롤이 이물질에 의해 오염되는 것을 최소화시킬 수 있으며, 강판과 세라믹 허스롤 사이에 미세한 마찰력이 발생하면서 허스롤 표면에 부착된 이물질이 제거된다.If the rotational speed of the hearth roll is set differently for each section, the point contact is induced between the steel plate and the hearth roll without stopping the line, and also the hearth roll can be minimized from being contaminated by foreign substances. Fine friction is generated between the hearth rolls, and foreign matter adhering to the hearth roll surface is removed.
이하에서, 본 발명의 실시예를 살펴본다.Hereinafter, an embodiment of the present invention will be described.
16개의 세라믹 허스롤이 설치된 통상의 연속 소둔설비를 사용하고, 또한 상기 허스롤의 각각을 별도의 구동모터를 이용하여 개별적으로 구동하였다.A conventional continuous annealing apparatus equipped with 16 ceramic hearth rolls was used, and each of the hearth rolls was individually driven using a separate drive motor.
그리고, 실시예에서 사용된 강판은 탄소(C) 0.04∼0.07wt%, 규사(Si) 2.5∼4.0wt%, 망간(Mn) 0.5∼0.25wt%, 인(P) 0.03wt% 이하, 황(S) 0.02wt% 이하, 알루미늄(Al) 0.1wt% 이하, 질소(N) 0.01wt% 이하, 나머지 Fe 및 기타 불가피한 불순물로 이루어진 방향성 전기강판용 냉연강판이었다.In addition, the steel sheets used in the examples were 0.04 to 0.07 wt% of carbon (C), 2.5 to 4.0 wt% of silica sand (Si), 0.5 to 0.25 wt% of manganese (Mn), 0.03 wt% or less of phosphorus (P), and sulfur ( S) 0.02 wt% or less, aluminum (Al) 0.1 wt% or less, nitrogen (N) 0.01 wt% or less, cold rolled steel sheet for oriented electrical steel sheets composed of remaining Fe and other unavoidable impurities.
소둔조건으로서, 소둔로 내 온도는 연속적으로 제품 생산시와 동일한 소둔조건 즉, 가열대 880∼900℃, 균열대 855~860℃, 환원대 650~700℃, 냉각대 150~300℃로 각각 설정하고, 이슬점: 70∼80℃, 수소 50vol% 및 질소 50vol% 정도인 0.2∼2.0N㎥/hr의 유량으로 질소가스를 주입하였다.As annealing conditions, the temperature in the annealing furnace is continuously set to the same annealing conditions as in the production of the product, that is, the heating table 880 to 900 ° C, the cracking table 855 to 860 ° C, the reducing table 650 to 700 ° C, and the cooling table 150 to 300 ° C, respectively. Nitrogen gas was injected at a flow rate of 0.2 to 2.0 Nm 3 / hr, which was a dew point of 70 to 80 ° C., 50 vol% of hydrogen, and 50 vol% of nitrogen.
그리고, 강판의 온라인 속도를 100mpm으로 유지한 상태에서, 가열대에 설치된 허스롤(13A)의 회전속도는 97∼98mpm, 균열대에 설치된 허스롤(13B)의 회전속도는 98∼99mpm, 환원대에 설치된 허스롤(13C)의 회전속도는 99∼100mpm, 냉각대에 설치된 허스롤(13D)의 회전속도는 100∼101mpm의 범위로 유지하였다.Then, while the on-line speed of the steel sheet was maintained at 100 mpm, the rotational speed of the hearth roll 13A provided on the heating table was 97-98mpm, and the rotational speed of the hearth roll 13B provided on the cracking table was 98-99mpm, The rotational speed of the hearth roll 13C provided was 99 to 100mpm, and the rotational speed of the hearth roll 13D provided to the cooling table was maintained in the range of 100 to 101mpm.
또한, 하기 표 1은 허스롤의 회전속도를 다양하게 하여 그 회전속도가 본 발명의 범위에 있는 것을 실시예로 표시하고 본 발명의 범위에서 벗어난 것을 비교예로 표시하였다. 또한, 하기에서 나타낸 허스롤 회전속도는 강판의 온라인 속도에 대한 상대속도이다. 즉, "1"로 표시된 것은 강판의 온라인 속도에 1을 더한 값인 "101"이 절대 회전속도이며, "-1"로 표시된 것은 강판의 온라인 속도에 1을 뺀 값인 "99"가 절대 회전속도이다.In addition, Table 1 below shows the rotational speed of the hearth roll to vary the rotational speed in the scope of the present invention by way of example and the deviation from the scope of the present invention as a comparative example. In addition, the hearth roll rotation speed shown below is a relative speed with respect to the online speed of the steel sheet. In other words, "1" denotes the absolute rotational speed of "101", which is the online speed of the steel plate plus 1, and "99" denotes the absolute rotational speed of the steel plate of the online speed of the steel plate minus one. .
이러한 비교예1 내지 비교예5 및 실시예1 내지 실시예3에 따른 브러싱 효과, 즉 강판과 세라믹 허스롤 사이에 미세한 마찰력이 발생하면서 허스롤 표면에 부착된 이물질이 제거되는 효과를 확인하기 위하여, 허스롤의 오염 여부, 강판의 이물마크 발생 여부 및 제품의 이물마크 발생 여부 등을 측정하였으며, 또한 허스롤의 저속회전에 의해 강판에 과도한 장력이 가해지는지의 여부를 판단하기 위하여, 강판의 두께 변화 및 강판에 굽힘 변형이 발생하는지의 여부를 측정하였다.In order to confirm the brushing effect according to Comparative Examples 1 to 5 and Examples 1 to 3, that is, the effect of removing foreign matter adhered to the surface of the hearth roll while generating a fine frictional force between the steel plate and the ceramic hearth roll, The thickness of the steel sheet was measured to determine whether there was contamination of the hearth roll, foreign material marks on the steel plate and foreign material marks on the product. Also, in order to determine whether excessive tension is applied to the steel sheet by the low speed rotation of the hearth roll, And whether bending deformation occurred in the steel sheet was measured.
구체적으로, 허스롤의 오염여부 판단은 허스롤 표면에 부착된 이물질을 직접 육안으로 확인하여 이물질이 없으면 합격(○), 육안상 미발견되나 촉감이 있으면 보통(△), 이물질이 발견되면 불합격(×)으로 구분하였다.Specifically, judging whether or not the contamination of the hearth roll is directly checked by the naked eye attached to the surface of the hearth roll and pass (○) if there is no foreign matter, undetected visually, but normal (△) if there is a touch, fail ( X).
강판의 이물마크 발생 여부는 별도의 이물마크 체크용 스트립을 소둔로 내에 투입한 후 10초 정도 허스롤을 회전시켜 강판에 발생된 흠집정도를 보고 판단하였다. 이때 촉감과 흠집이 없으면 합격(○), 촉감은 없으나 심한 흠집이 육안으로 관찰되면 보통(△), 촉감과 흠집이 발견되면 불합격(×)으로 구분하였다.The presence of foreign material marks on the steel sheet was determined by inserting a separate foreign material check strip into the annealing furnace and rotating the hearth roll for about 10 seconds to determine the degree of scratches generated in the steel sheet. At this time, if there is no touch and scratches, pass (○), no touch, but if severe scratches are observed with the naked eye, it is classified as normal (△), and if touch and scratches are found, it is classified as fail (×).
제품 표면에의 이물마크 발생 여부는 소둔조건의 온도까지 승온시킨 후 제품 강판을 소둔로내 투입시켜 통과한 제품에 이물마크가 미 발생되면 합격(○), 이물마크 흔적은 있으나 촉감이 없으면 보통(△), 이물마크가 육안으로 확인되면 불합격(×)으로 구분하였다.The presence of a foreign material mark on the surface of the product is raised to the temperature of the annealing condition, and the product steel sheet is put into the annealing furnace. (Triangle | delta)), and when a foreign material mark was visually recognized, it divided into reject (x).
강판의 두께변화의 정도 및 골판 발생 여부는 의도한 제품 두께(0.25∼0.5T) 대비 0.005∼0.01T 정도의 두께 감소에 골판짐, 즉 굽힙변형이 없으면 합격(○), 의도한 제품 두께(0.25∼0.5T) 대비 0.01∼0.03T 정도의 두께 감소에 골판이 발생될 조짐이 보이면 보통(△), 의도한 제품 두께(0.25∼0.5T) 대비 0.03∼0.07T 정도의 두께 감소에 골판 식별이 가능한 경우 불합격(×)으로 구분하였다.The degree of change in the thickness of the steel sheet and the occurrence of the corrugated plate were correlated with the thickness reduction of 0.005 to 0.01T compared to the intended product thickness (0.25 to 0.5T), that is, if there is no bending deformation, the pass (○) and the intended product thickness (0.25 ~ 0.5T), if there is a sign of occurrence of the corrugated plate at 0.01 ~ 0.03T thickness reduction, it is possible to identify the corrugated plate at a thickness reduction of 0.03 ~ 0.07T compared to the intended product thickness (0.25 ~ 0.5T). In case of failure, it was divided into (×).
결과를 하기 표 2에 나타내었다.The results are shown in Table 2 below.
[표 1] 및 [표 2]에서 볼 수 있는 바와 같이, 온라인 속도를 100mpm 상태로 유지하면서 가열대측 허스롤의 회전속도는 온라인 속도 대비 -3 ~ -2mpm으로, 균열대측 허스롤의 회전속도는 온라인 속도 대비 -2 ~ -1mpm으로, 환원대측 허스롤의 회전 속도는 온라인 속도 대비 -1 ~ 0mpm으로, 냉각대측 허스롤의 회전 속도는 온라인 속도 대비 0 ~ +1mpm으로 각각 설정하여 라인 정지 없이 온라인 작업중일 경우(실시예 1 내지 3) 브러싱 효과 및 스트립 두께 변화가 양호하게 나타났다.As shown in [Table 1] and [Table 2], while maintaining the online speed at 100mpm, the rotational speed of the heating-side hearth roll is -3 ~ -2mpm compared to the online speed, and the rotational speed of the crack-side hearth roll is -2 ~ -1mpm compared to the online speed, the rotational speed of the reducing side hearth roll is -1 ~ 0mpm compared to the online speed, and the rotational speed of the cooling side hearth roll is set to 0 ~ + 1mpm compared to the online speed, respectively. When working (Examples 1 to 3) the brushing effect and the strip thickness change were good.
그리고, 온라인 속도를 100mpm 상태로 유지하면서 가열대측 허스롤의 회전속도는 온라인 속도 대비 -3mpm으로, 균열대측 허스롤의 회전속도는 온라인 속도 대비 -2mpm으로, 환원대측 허스롤의 회전속도는 온라인 속도 대비 -1mpm으로, 냉각대측 허스롤의 회전속도는 온라인 속도 대비 0mpm이하로 할 경우(비교예 1 내지 3) 브러싱 효과가 저하되어 허스롤의 표면에 이물질이 잔존하였다.And while maintaining the online speed at 100mpm, the rotational speed of the heating-side hearth roll is -3mpm compared to the online speed, the rotational speed of the crack-side hearth roll is -2mpm compared to the online speed, and the rotational speed of the reducing-side hearth roll is online speed In contrast, -1mpm, when the rotational speed of the cooling-side hearth roll is 0mpm or less compared to the on-line speed (Comparative Examples 1 to 3), the brushing effect was lowered, and foreign matter remained on the surface of the hearth roll.
또한, 온라인 속도를 100mpm 상태로 유지한 상태에서 가열대측 허스롤의 회전속도는 온라인 속도 대비 -2mpm으로, 균열대측 허스롤의 회전속도는 온라인 속도 대비-1mpm으로, 환원대측 허스롤의 회전 속도는 온라인 속도 대비 0mpm으로, 냉각대측 허스롤의 회전 속도는 온라인 속도 대비 +1mpm이상으로 할 경우 강판이 늘어나는 조짐이 발생하였다.In addition, while maintaining the online speed at 100mpm, the rotational speed of the heating-side hearth roll is -2mpm compared to the online speed, the rotational speed of the crack-side hearth roll is -1mpm compared to the online speed, and the rotational speed of the reduction-side hearth roll is At 0mpm compared to the on-line speed, the rotational speed of the hearth roll on the cooling side was increased to + 1mpm compared to the on-line speed.
전방롤을 역방향으로 회전시키는 경우(비교예 4, 5)에는 브러싱 효과 및 강판 두께 변화가 열위한 것으로 나타났다. 특히 전방롤을 역방향 회전시키는 경우, 강판에 걸리는 인장력에 의해 최악의 경우 파단이 발생될 위험이 있었다.When the front roll was rotated in the reverse direction (Comparative Examples 4 and 5), the brushing effect and the steel sheet thickness change were found to be inferior. In particular, when rotating the front roll in the reverse direction, there was a risk of breaking in the worst case due to the tensile force applied to the steel sheet.
상술한 바와 같이 본 발명에 따른 세라믹 허스롤 표면부 이물질 제거방법에 의하면, 고온 소둔로내 온라인 상태에서 세라믹 허스롤 표면부 이물질 제거를 위한 브러싱 작업이 효과적으로 이루어질 수 있으며, 이에 따라 생산성 증가 및 브러싱 강판을 별도로 설치할 필요성이 없으며 또한 설비의 휴지 상태에서 별도의 브러싱 작업을 수행할 필요가 없어 설비의 가동효율이 향상되는 효과를 갖는다.As described above, according to the method of removing foreign matters on the surface of the ceramic hearth roll according to the present invention, a brushing operation for removing foreign matters on the surface of the ceramic hearth roll in the online state in a high temperature annealing furnace can be effectively performed, thereby increasing productivity and brushing steel sheet. There is no need to install separately and do not need to perform a separate brushing operation in the idle state of the equipment has the effect of improving the operating efficiency of the equipment.
또한 강판의 오염이 방지되므로 전기강판의 절연코팅성, 층간 와전류 방지 및 점적율이 향상된다.In addition, since contamination of the steel sheet is prevented, insulation coating properties, interlayer eddy current prevention, and spot ratio of the electrical steel sheet are improved.
나아가 세라믹 허스롤 사용기간을 2배 정도 연장시켜 원가절감에 획기적인 효과를 가져온다.Furthermore, the use of ceramic hearth rolls has been extended by two times, bringing a dramatic effect on cost reduction.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62274084A (en) | 1986-05-21 | 1987-11-28 | Kawasaki Steel Corp | Method for removing matter sticking to roll |
| JPH08302432A (en) * | 1995-05-10 | 1996-11-19 | Nkk Corp | Manufacture of high silicon steel strip |
| JPH11286731A (en) | 1998-04-01 | 1999-10-19 | Nippon Steel Corp | Horizontal type continuous heat treatment furnace for grain silicon steel sheet |
| KR20030043457A (en) * | 2001-11-28 | 2003-06-02 | 주식회사 포스코 | Method for controlling entrance interval and entrance velocity according to thickness of a plate in heat treatment furnace |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62274084A (en) | 1986-05-21 | 1987-11-28 | Kawasaki Steel Corp | Method for removing matter sticking to roll |
| JPH08302432A (en) * | 1995-05-10 | 1996-11-19 | Nkk Corp | Manufacture of high silicon steel strip |
| JPH11286731A (en) | 1998-04-01 | 1999-10-19 | Nippon Steel Corp | Horizontal type continuous heat treatment furnace for grain silicon steel sheet |
| KR20030043457A (en) * | 2001-11-28 | 2003-06-02 | 주식회사 포스코 | Method for controlling entrance interval and entrance velocity according to thickness of a plate in heat treatment furnace |
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