KR100328090B1 - Method for manufacturing a wide hot-rolled strip with low crown - Google Patents

Method for manufacturing a wide hot-rolled strip with low crown Download PDF

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KR100328090B1
KR100328090B1 KR1019970074580A KR19970074580A KR100328090B1 KR 100328090 B1 KR100328090 B1 KR 100328090B1 KR 1019970074580 A KR1019970074580 A KR 1019970074580A KR 19970074580 A KR19970074580 A KR 19970074580A KR 100328090 B1 KR100328090 B1 KR 100328090B1
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South Korea
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rolling
roll
wide
hot
crown
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KR1019970074580A
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Korean (ko)
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KR19990054714A (en
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강신환
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이구택
포항종합제철 주식회사
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/42Control of flatness or profile during rolling of strip, sheets or plates using a combination of roll bending and axial shifting of the rolls
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/40Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2265/00Forming parameters
    • B21B2265/14Reduction rate

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)

Abstract

PURPOSE: A method for manufacturing a wide hot rolled strip having low crown more simply and economically by using thermal crown phenomena formed during the initial rolling stage is provided. CONSTITUTION: In a method for manufacturing a wide hot rolled strip for cold rolled narrow thin strips using a hot rolling machine comprising a plurality of finishing mills, the method for manufacturing a wide hot rolled strip having low crown comprises the processes of performing narrow thick strip hot rolling within the rolling amount range of 5 to 10% of the life cycle of one roll unit; and performing wide strip hot rolling in at least two or more finishing mills from the rear side of the finishing rolling mills within the rolling amount range of 5 to 60% of the life cycle of one roll unit using 3 to 20% increased roll bender force compared to an ordinary roll bender force for wide strips, wherein roll crossing of each finishing mills prior to the last finishing mill is performed in the range of 0.5 to 0.7 degree of an angle, and roll crossing of the last finishing mill is performed in an angle of 0.4 degree or less.

Description

저 크라운 열간압연 광폭박판의 제조방법{Method for manufacturing a wide hot-rolled strip with low crown}Method for manufacturing a wide hot-rolled strip with low crown

본 발명은 냉간압연 협폭박물재 등에 사용되는 열간압연 광폭박판의 제조방법에 관한 것으로서, 보다 상세하게는 압연초기 협폭재투입에 의해 형성되는 압연롤의 열 크라운 현상을 이용하여 저 크라운 열간압연 광폭박판을 제조하는 방법에 관한 것이다.The present invention relates to a method for manufacturing a hot rolled wide thin plate used in cold rolled narrow narrow material, and more particularly, to a low crown hot rolled wide thin plate using a thermal crown phenomenon of a rolling roll formed by initial narrow narrow material injection. It relates to a method of manufacturing.

종래에는 연속주조에 의한 협폭스라브 생산 및 열간압연 협폭재 생산을 거쳐 냉연협폭 박물재를 생산하였다. 그러나 상기한 협폭스라브 생산 및 열간압연 협폭재 생산을 통해 냉연협폭 박물재를 생산하는 경우에는 생산성이 낮은 단점이 있다.Conventionally, after the narrow slab production and hot-rolled narrow width production by continuous casting produced cold rolled narrow width material. However, in the case of producing the cold rolled narrow width material through the narrow slab production and hot rolled narrow width production, there is a disadvantage in low productivity.

상기한 냉연협폭박물재 생산에 있어 생산성을 개선하기 위한 방법으로서 연속주조 스라브 생산시 광폭재를 생산하여 길이방향으로 스라브를 폭분할하여 열간압연공정에 투입하는 방법이 제안되어 행해지고 있다. 그러나 상기 방법의 경우에는 연속주조 스라브 내부의 중심편식, 중심크랙 등 불건전부 존재시 분할된 스라브를 불량재로 처리하게 되어 생산성 향상효과가 미흡한 실정이다.As a method for improving productivity in the production of cold-rolled narrow width material, the method of producing a wide material in continuous casting slab production and dividing the slab in the longitudinal direction and introducing it into a hot rolling process has been proposed. However, in the case of the above method, when there is an unhealthy part such as a center portion inside the continuous casting slab and a center crack, the divided slab is treated as a defective material and thus the productivity improvement effect is insufficient.

생산성 향상을 위한 또 다른 방법으로서 연속주조주형내에 폭분할용 격벽을 설치하여 동시에 폭분할된 상태로 주조하는 방식이 제안되었으나, 이 방법의 경우에는 열간압연에서의 생산성 향상은 수반되지 못하고 단지 연속주조에서만의 생산성 개선효과만을 얻을 수 있어 생산성 향상효과가 미흡하다. 따라서 생산성 측면 등을 고려하여 연속주조 광폭재 생산, 열간압연광폭재 생산, 및 폭분할을 거쳐 냉간압연협폭박물재를 생산하는 방법이 널리 채용되고 있다.As another method for improving productivity, a method of casting in a state in which a width-dividing partition wall is installed in a continuous casting mold and at the same time has been proposed, but in this case, productivity is not accompanied by improvement in hot rolling. Only the productivity improvement effect can be obtained only in the case of insufficient productivity improvement effect. Therefore, in view of productivity, a method of producing cold rolled narrow width material through continuous casting wide width material production, hot rolled wide width material production, and width division has been widely adopted.

본 발명은 상기한 연속주조광폭재 생산, 열간압연광폭재 생산 및 폭분할을 거쳐 냉간압연 협폭재 박물재를 생산하는 방법에 있어 열간압연 광폭재 생산에 관한 것으로서, 이하에서는 이에 대하여 설명한다.The present invention relates to the production of hot-rolled wider material in the method of producing the cold-rolled narrower material through the continuous casting wider material production, hot rolled wider material production and the width-dividing described above, it will be described below.

냉간압연 협폭박물재용 열간압연광폭박판을 통상의 평크라운롤을 이용하여 제조하는 경우 초기에는 약 1000mm 폭이내, 두께 4mm 이상 후물협폭재를 투입하여 압연하고 최대광폭재압연을 거쳐 차츰 박물협폭재로 이행하여 가면서 부분적으로 중간정도의 광폭재를 투입하여 압연해 나간다. 이 경우 박물광폭재는 최대광폭재 압연전후에 투입하여 생산하고 있다.In the case of manufacturing hot rolled wide thin plate for cold rolled narrow width material using ordinary flat crown roll, it is rolled by inserting thick narrow width material within about 1000mm width and thicker than 4mm thickness at first, and then gradually rolled up to wide width narrowing material. As it moves, it partially rolls with a medium width member. In this case, the material wide material is produced before and after rolling the widest wide material.

상기와 같이, 평크라운 롤을 이용하여 열간압연 광폭박판을 제조하는 경우에는 통상 광폭박판에 35∼60μm 정도의 크라운이 형성되며 폭이 클수록 크게 발생된다.As described above, in the case of manufacturing a hot rolled wide thin plate using a flat crown roll, a crown having a thickness of about 35 to 60 μm is usually formed on the wide thin plate, and the larger the width, the larger the crown.

이러한 현상은 평삭롤로 스라브를 열간압연하여 광폭의 열연평판강대를 만드는 경우 광폭압연작업시 압하에 의한 압연롤의 양단부분에 압하력에 의해 휨변형이 증가하여 판에 크라운이 크게 형성되는 경향이 발생하기 때문이다. 특히 3mm 이하의 박물재를 1400mm 이상의 광폭재로 압연하는 경우 이러한 현상은 더욱 두드러지게 되며 통상 45μm 이상의 판크라운이 형성된다.This phenomenon occurs when the slab is hot rolled with a flattening roll to make a wide hot rolled sheet steel sheet. Therefore, when the wide rolling operation is performed, the bending deformation increases at both ends of the rolling roll due to the rolling reduction, so that the crown is formed large on the plate. Because. Particularly, when a thin material of 3 mm or less is rolled into a wide material of 1400 mm or more, this phenomenon becomes more prominent, and a plate crown of 45 μm or more is usually formed.

상기와 같이 판 크라운이 형성된 열간압연 광폭박판을 폭분할 스리팅하여 냉연용도로 재압연 투입시에는 스리팅부위인 중앙부 두께가 두꺼워 냉간압연후 편측파고가 형성되어 재압연용도로 사용할 수 없게 된다.As described above, when hot rolled wide-rolled thin plate having a plate crown is split-split and re-rolled for cold rolling, the thickness of the center portion, which is the slitting part, is thick, and thus a unilateral wave is formed after cold rolling, and thus cannot be used for re-rolling.

상기한 판 크라운 형성을 억제하기 위한 방법으로 롤 단위내에서의 압연롤 위치 조정만을 실시하는 방법을 들 수 있다. 그러나, 롤 단위내에서 압연롤 위치조정만을 행하는 경우에는 다음과 같은 문제점이 있게 된다.As a method for suppressing the above-mentioned plate crown formation, the method of performing only the rolling roll position adjustment in a roll unit is mentioned. However, when only rolling roll position adjustment is performed in a roll unit, there exists a following problem.

1) 박물광폭재를 롤단위 초반에 투입할 경우 판크라운이 과대발생하는 경향이 나타나 열간압연판에서의 저 크라운 확보는 더욱 어려워 지고,1) When the thin material broadener is introduced at the beginning of the roll unit, plate crowns tend to occur excessively, making it difficult to secure a low crown in a hot rolled plate.

2) 롤단위 후반부에 투입하는 경우 판의 양측부분 끝 부근에 협폭압연재의 연속 압연에 의해 발생된 부분적 과다 마모개소 존재로 인해 광폭박물압연 투입재의 판상에 하이스폿(high spot)을 발생하게 되어 냉연박물압연후 형상불량을 유발하게 되며,2) In case of putting in the latter part of roll unit, high spots are generated on the plate of wide thin rolled input material due to the presence of partial excessive wear caused by continuous rolling of narrow rolled material near both ends of the plate. After cold rolling, it will cause shape defects.

3) 통상압연방식의 광폭재 압연중에 단순히 압하력만 증강시키면 열간압연중 판에 다량의 주름이 발생하여 판의 편측사행 등 압연조작실수 등 작업위험이 유발되거나 폭분할 작업이 불가할 정도로 형상불량이 야기된다.3) If the rolling force is simply increased during the rolling of the broad rolling material of the ordinary rolling method, a large amount of wrinkles may occur on the plate during hot rolling, which may cause work risks such as rolling operation such as unilateral slanting of the plate, or shape defects such that the work cannot be divided. This is caused.

상기한 판 크라운 형성을 억제하기 위한 다른 방법으로는 압연롤을 크로싱(crossing)하여 압연하는 방법, 압연롤을 내,외부롤로 2중화하여 내부에 유체에 의한 유압을 부여하여 롤 표면에 크라운을 형성하여 저 크라운 평판을 제조하는 방법, 도1에 나타난 바와 같이 롤 가공시 '+' 크라운을 롤에 부여하도록 초기 연삭을 실시하는 방법 및 롤에 'S'자형 크라운을 압연롤에 부여토록 연삭하여 롤을 축방향으로 이동하여 적정 판 크라운을 얻어내는 방법 등을 들 수 있다.Another method for suppressing the formation of the plate crown is a method of cross rolling and rolling a rolling roll, and double rolling the rolling roll into inner and outer rolls to impart hydraulic pressure to the inside to form a crown on the roll surface. Method for producing a low crown flat plate, as shown in Figure 1, the initial grinding to give a '+' crown to the roll during the roll processing and the roll by grinding to give the 'S' shaped crown to the rolling roll The method of moving to an axial direction, and obtaining a suitable plate crown is mentioned.

도1에서 부호 "1"은 압연롤을, 그리고 "2"는 광폭재를 나타낸다. 그러나 상기한 압연롤을 크로싱하여 압연하는 방법의 경우 단순히 박판협폭재 냉연용 소재를 열연광폭생산코자 하면 열간압연판중 판중앙부에 과도한 파고가 형성되어 판이 날아다니게 되는 현상을 유발하여 압연오작 등을 일으킬 우려가 높은 단점이 있다.In Fig. 1, reference numeral "1" denotes a rolling roll and "2" denotes a broad member. However, in the case of the method of rolling by rolling the above-mentioned rolling rolls, if you simply want to produce hot rolled width cold rolled material for hot rolled slag, excessive dug is formed at the center of the plate in the hot rolled sheet, causing the plate to fly and causing rolling malfunction. There is a high concern.

또한 상기 유압에 의해 롤 표면에 크라운을 형성하는 방법의 경우에는 압연설비비가 고가인 문제점이 있고, '+'크라운을 롤에 부여하는 방법은 압연롤의 전체수명을 단축하게 되어 경제성이 감소되는 문제점이 있으며, 롤에 'S'자형 크라운을 부여하는 방법의 경우에는 설비비가 증가할 뿐만 아니라 광폭박물재의 판전체에 고른 저 크라운을 형성하기 어려운 문제점이 있다.In addition, the method of forming a crown on the surface of the roll by the hydraulic pressure has a problem that the rolling equipment cost is expensive, the method of applying a '+' crown to the roll shortens the overall life of the rolling roll to reduce the economic efficiency There is a problem in that the method of providing the 'S'-shaped crown on the roll is not only to increase the equipment cost, but also to form a low crown evenly on the whole plate of the wide material.

본 발명자는 상기한 종래방법 들의 제반 문제점을 해결하기 위하여 연구 및 실험을행하고, 그 결과에 근거하여 본 발명을 제안하게 된 것으로서, 본 발명은 열간 압연초기에 형성되는 롤의 열크라운 현상을 이용하여 보다 간단하고 보다 경제적으로 보다 적은 크라운을 갖는 열간압연 광폭박판을 제조하고자 하는데 그 목적이 있다.The present inventors have conducted research and experiments to solve the above problems of the conventional methods, and based on the results, the present invention proposes the present invention by using a hot crown phenomenon of a roll formed at the beginning of hot rolling. It is an object of the present invention to manufacture a hot rolled wide thin plate having a simpler and more economically less crown.

도1은 종래의 저 크라운 열간압연 광폭박판의 제조방법을 설명하기 위한 모식도1 is a schematic diagram for explaining a method for manufacturing a conventional low crown hot rolled wide plate.

도2는 본 발명에 따라 저 크라운 열간압연 광폭박판을 제조하는 방법을 설명하기 위한 모식도Figure 2 is a schematic diagram for explaining a method for producing a low crown hot rolled wide width plate according to the present invention.

도3은 통상의 방법과 본 발명에 의해 열간압연 광폭박판을 제조한 경우 광폭박판의 크라운 및 웨지 형성정도를 나타내는 그래프Figure 3 is a graph showing the degree of crown and wedge formation of the wide thin plate when the hot-rolled wide plate according to the conventional method and the present invention

* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

1: 압연롤 2: 광폭재 3: 협폭재1: rolling roll 2: wide member 3: narrow member

본 발명은 다수개의 사상압연기를 구비한 열간압연기를 사용하여 냉간압연 협폭박물재용 열간압연광폭박판을 제조하는 방법에 있어서, 1개의 롤단위 수명의 5-10%의 압연량 범위에서 협폭후물재 열간압연을 행하고 1개의 롤단위 수명의 5-60%의 압연량 범위에서 사상압연기들중 후단부 적어도 2개 이상의 사상압연기에서 통상의 광폭박판재 롤 벤더력 대비 3-20% 증대된 롤 벤더력으로 광폭박판재 열간압연을 행하여 저 크라운 열간압연 광폭박판을 제조하는 방법에 관한 것이다.The present invention relates to a method for manufacturing a hot rolled wide width sheet for cold rolled narrow width material using a hot rolling mill having a plurality of filament rolling mills. Rolling is performed, and the roll bender force is increased by 3-20% compared to the general wide sheet roll bender in at least two finishing mills in the rear end of the finishing mills in the rolling amount range of 5-60% of the life of one roll unit. The present invention relates to a method for producing a low crown hot rolled wide width plate by performing hot rolled sheet material.

이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

본 발명은 도2에 나타난 바와 같이 1개의 롤단위 수명의 5-10%의 압연량 범위에서 협폭재(3) 열간압연을 행하고[도2(b) 참조], 1개의 롤단위 수명의 5-60%의 압연량 범위에서 광폭재(2) 압연을 행함으로서 저 크라운 열간압연 광폭박판을 제조하는 방법이다.As shown in Fig. 2, the present invention performs hot rolling of the narrow material 3 in the rolling amount range of 5 to 10% of the life of one roll unit (see Fig. 2 (b)). It is a method of manufacturing a low crown hot rolled wide width plate by performing wide material (2) rolling in 60% of rolling amount range.

본 발명에 따라 저 크라운 열간압연 광폭박판을 제조하기 위해서는 1개 롤단위 수명의 초기 5-10% 범위에서 협폭 후물재를 투입하여 협폭후물재 열간압연을 해야 한다.In order to manufacture the low crown hot rolled wide width plate according to the present invention, the narrow thick material should be hot rolled in a narrow thick material in the initial 5-10% of the life of one roll unit.

상기 협폭후물재 열간압연이 1개롤 단위 수명의 초기 5% 미만까지만 행해지는 경우에는 롤에 적정 수준의 열팽창 크라운이 형성되지 않아 저 크라운(35μm 이하)의열연 광폭박물재 제조가 어렵고, 초기 10% 이상까지 행해지는 경우에는 초기 조정용 협폭후물재 압연시 발생하는 압연통판 양단부 마모량 증가로 인한 부분적 이상이 증대되어 품질이 열화될 우려가 있다.When the narrow thick material hot rolling is performed only to less than the initial 5% of the life of one roll unit, it is difficult to manufacture a low crown (35 μm or less) hot rolled wide width material because an appropriate level of thermal expansion crown is not formed on the roll. In the case of performing to the above, there is a fear that the partial abnormality due to the increase in the amount of wear on both ends of the rolling plate generated during the narrow narrow material for initial adjustment is increased and the quality is deteriorated.

따라서 본 발명에 있어 협폭후물재 열간압연은 1개의 롤단위 수명의 초기 5-10% 범위에서 행하는 것이 바람직하다.Therefore, in the present invention, it is preferable that the narrow thick material hot rolling is performed in the initial 5-10% range of one roll unit life.

상기 협폭후물재 열간압연시 협폭후물재는 목적하는 박물광폭재 폭의 60-90% 범위의 폭과 4mm 이상의 두께를 갖는 것이 바람직한데, 그 이유는 초기 협폭압연 말기재와 목적하는 광폭박물압연의 초번재간의 폭차이가 너무 큰 경우(150mm 초과하는 경우)에는 목적광폭재의 폭양단부 인접 부근에서 양측 2개소의 하이스폿(high-spot)을 형성하기 때문이다.The narrow width material at the time of hot rolling of the narrow width material material preferably has a width in the range of 60-90% of the width of the width of the desired thin material material and a thickness of 4 mm or more. This is because when the width difference between the first ashes is too large (more than 150 mm), two high spots are formed on both sides near the widthwise ends of the target width ashes.

한편, 상기 광폭박판재 열간압연이 1개 롤단위 수명의 5% 미만의 압연량 범위에서 행해지는 경우에는 적정한 열 크라운 형성이 되지 않아 저 크라운 확보가 곤란하고 60%를 초과한 압연량범위에서 행해지는 경우에는 롤에 형성된 양측 홈모양 마모부에 의해 하이스폿(high-spot)이 형성되어 냉연박물재 압연후 빌드 업(build up)과 같은 형상불량을 일으킬 우려가 크다.On the other hand, when the wide sheet hot rolling is performed in the rolling amount range of less than 5% of the life of one roll unit, it is difficult to secure a low crown due to the lack of proper thermal crown formation and is performed in the rolling amount range exceeding 60%. In this case, high-spots are formed by both groove-shaped wear parts formed on the roll, and there is a high possibility of causing a shape defect such as build up after rolling the cold rolled material.

따라서, 본 발명에 있어 광폭박판재 열간압연은 1개롤단위 수명의 5-60%의 압연량 범위에서 행해지는 것이 바람직하다. 상기한 5-60%의 압연량 범위는 압연중 온라인 롤 드레싱(on-line roll dressing)을 실시한 경우에 적용하는 것이 바람직하고, 롤 드레싱을 실시하지 않은 경우에는 광폭박판재 열간압연은 1개롤 단위 수명의 5-40%의 압연량 범위로 제한하는 것이 바람직하다.Therefore, in the present invention, it is preferable that the hot rolled wide sheet material is performed in the rolling amount range of 5-60% of the life of one roll unit. The above 5-60% rolling range is preferably applied when on-line roll dressing is performed during rolling, and when the roll dressing is not performed, hot rolled sheet is used for one roll unit life. It is desirable to limit the rolling amount to 5-40% of the range.

상기 사상압연기들중 후단부 적어도 2개 이상의 사상압연기에서의 통상의 광폭박판재 롤 벤더력이 통상의 광폭박판재 롤 벤더력 대비 증가율이 3% 이하인 경우에는 적정한 저 크라운을 갖는 광폭 박판재를 얻기 곤란하고, 증가율이 20% 이상인 경우에는 압연력 과다로 인한 판의 양 어깨부 이상 두께 감소가 일어날 우려가 있으므로, 본 발명에 있어 롤 벤더력은 통상의 광폭박판재 롤 벤더력 대비 3-20% 증가시키는 것이 바람직하다.When the general wide sheet roll bender force in the rear end of at least two or more finishing mills of the finishing mills has an increase rate of 3% or less compared to the general wide sheet roll bender force, it is difficult to obtain a wide sheet material having an appropriate low crown. When the increase rate is 20% or more, there is a possibility that the thickness reduction of both shoulder portions of the plate due to excessive rolling force may occur, so that the roll bender force in the present invention is increased by 3-20% compared to the general wide sheet roll bender force. Do.

본 발명에 있어서는 최종 사상압연기 이전의 각 사상압연기의 롤 크로싱을 0.5~0.7° 범위로 부과하고, 또한 최종 사상압연기의 롤 크로싱을 0.4° 이하로 하여 압연시 판 중앙부에 발생하는 파고(중파)형성을 적정수준으로 감소시켜 압연주행성과 작업 안정성을 확보토록 하는 것이 바람직하다. 즉, 롤 크로싱이 0.7°초과하면 중심부가 과잉 압연되어 중심부 파형굴곡이 발생하여 압연형상이 불량해지며 0.5°보다 작아지면 판형상제어 역할이 감소되어 중앙부의 두께가 두꺼워져 향에지부가 얇아지는 과잉크라운이 발생된다. 또한, 최종 사상압연기의 롤 크로싱이 0.4°미만의 경우에도 중심부가 과잉 압연되어 중심부 파형굴곡이 발생하여 압연형상이 불량해진다.In the present invention, the wave crossing of each finishing mill before the final finishing mill is imposed in the range of 0.5 to 0.7 °, and the roll crossing of the final finishing mill is 0.4 ° or less, so that the crest (medium wave) is generated at the center of the plate during rolling. It is desirable to reduce the pressure to an appropriate level to ensure rolling runability and work stability. In other words, when the roll crossing exceeds 0.7 °, the center part is excessively rolled to cause the center wave bending, resulting in poor rolling shape, and when the roll crossing is smaller than 0.5 °, the plate shape control role is reduced and the thickness of the center part is thickened, resulting in thinner edges. Overcrowding occurs. In addition, even when the roll crossing of the final finishing mill is less than 0.4 °, the center portion is excessively rolled to cause the center portion to bend, resulting in poor rolling shape.

또한, 본 발명에 있어서는 동일 유사 폭 (압연재 폭 차이 약 50mm 이내) 연속 압연시 발생하는 롤 마모에 의한 판 크라운의 증가를 방지키위해 압연량 10-15㎞당 1회씩 상대적 협폭재(목적대상 냉연중 광폭재 대비 약 100-200 mm 적은 폭)롤 크라운 회복용 재료로 투입하여 1개의 롤단위 내에서 수회 반복하여 폭 분할 투입가능한박물 냉연소재에 적합한 수준인 35㎛ 이하의 저 크라운을 확보할 수도 있다.In addition, in the present invention, in order to prevent an increase in the plate crown due to roll wear occurring during continuous rolling of the same pseudo-width (within 50mm difference in the width of the rolled material), a relatively narrow width material is used once per 10-15 km of rolling amount (target object). It is about 100-200 mm smaller than wide width material during cold rolling) to secure low crown of 35㎛ or less, which is suitable for cold rolled material that can be divided into several times in one roll unit by inserting it into roll crown recovery material. It may be.

또한, 본 발명은 '+'의 초기 크라운을 부여하는 경우에도 적용할 수 있으며 이 경우에는 롤단위에서의 적용가능 범위가 초기 롤 크라운 부여치와 열팽창 크라운의 합이 광폭박물재 압하시의 롤 휨량과 상쇄되는 시점으로 해당 롤 단위내 위치를 이동하여 적용할 수 있다.In addition, the present invention may be applied to the case of giving an initial crown of '+', in which case the applicable range in the roll unit is the sum of the initial roll crown imparted value and the thermal expansion crown is the amount of roll warpage when the wide material is pressed. It can be applied by moving the position in the roll unit to the point of offsetting.

상기와 같이 광폭박판 열간압연 후에는 압연시 형성된 파고를 교정하는 스킨패스(skin pass)를 실시하여 폭분할처리시 정상적인 작업이 이루어지도록 한다.As described above, after the hot rolling of the wide thin plate, a skin pass for correcting the crest formed during rolling is performed to allow a normal operation to be performed during the width division process.

이하, 실시예를 통하여 본 발명을 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.

실시예Example

통상의 방법과 본 발명벙에 의해 판두께 2.0mm × 1524mm의 열간압연 광폭박판을 제조하고, 광폭박판의 크라운 형성 및 웨지형성 정도를 조사하고, 그 결과를 도 3에 나타내었다.According to the conventional method and the present invention, a hot rolled wide thin plate having a plate thickness of 2.0 mm x 1524 mm was prepared, and the crown formation and wedge forming degree of the wide thin plate were investigated, and the results are shown in FIG. 3.

도 3 (a)는 통상의 방법을 적용한 경우를, 도 3 (b)는 본 발명법을 적용한 경우를 나타낸다.Fig. 3 (a) shows a case where a conventional method is applied and Fig. 3 (b) shows a case where the present invention method is applied.

도 3에 나타낸 바와같이, 본 발명에 따라 열간압연 광폭 박판을 제조하는 경우가 통상의 방법을 적용한 경우보다 저 크라운 및 저 웨지가 형성됨을 알 수 있다.As shown in FIG. 3, it can be seen that the production of hot rolled wide thin plates according to the present invention results in the formation of low crowns and low wedges than when conventional methods are applied.

상술한 바와같이, 본 발명은 열간압연 초기에 형성되는 롤의 열 크라운 현상을 이용하여 보다 간단하고, 보다 경제적으로 보다 낮은 크라운을 갖는 냉간압연 협폭박물재용 열간압연 광폭박판을 제조할 수 있는 효과가 있는 것이다.As described above, the present invention is simpler, more economically, by using the heat crown phenomenon of the roll formed at the beginning of hot rolling, and more economically, it is possible to produce a hot rolled wide width plate for cold rolled narrow width material having a lower crown. It is.

Claims (2)

다수개의 사상압연기를 구비한 열간압연기를 사용하여 냉간압연 협폭박물재용 열간압연 광폭박판을 제조하는 방법에 있어서, 1개의 롤단위 수명의 5-10%의 압연량 범위에서 협폭후박재 열간압연을 행하고, 1개의 롤단위 수명의 5-60%의 압연량 범위에서 사상압연기들 중 후단부 적어도 2개 이상의 사상압연기에서 통상의 광폭박판재 롤 벤더력 대비 3-20% 증대된 롤 벤더력으로 광폭박판재 열간압연을 행하는 것을 특징으로 하는 저 크라운 열간압연 광폭박판의 제조방법In the method for manufacturing a hot rolled wide width plate for cold rolled narrow width material using a hot rolling mill having a plurality of filament rolling mills, the narrow width thin material hot rolling is performed in a rolling amount range of 5-10% of the life of one roll unit. Hot rolled sheet steel with roll bender force 3-20% higher than conventional wide sheet roll bender in at least two finishing mills in the rear end of finishing mills in the range of 5-60% of rolling life of one roll unit Process for producing a low crown hot rolled wide width plate, characterized in that rolling 제 1항에 있어서, 최종 사상압연기 이전의 각 사상압연기의 롤 크로싱을 0.5~0.7° 범위로 부과하고, 또한 최종 사상압연기의 롤 크로싱을 0.4°이하로 하는 것을 특징으로 하는 저 크라운 열간압연 광폭박판의 제조방법The low crown hot-rolled wide sheet according to claim 1, wherein a roll crossing of each finishing mill before the final finishing mill is imposed in a range of 0.5 to 0.7 °, and a roll crossing of the final finishing mill is 0.4 ° or less. Manufacturing Method
KR1019970074580A 1997-12-26 1997-12-26 Method for manufacturing a wide hot-rolled strip with low crown KR100328090B1 (en)

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