WO2023228466A1 - 鋼板の蛇行制御方法、蛇行制御装置、及び製造方法 - Google Patents
鋼板の蛇行制御方法、蛇行制御装置、及び製造方法 Download PDFInfo
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- WO2023228466A1 WO2023228466A1 PCT/JP2023/000975 JP2023000975W WO2023228466A1 WO 2023228466 A1 WO2023228466 A1 WO 2023228466A1 JP 2023000975 W JP2023000975 W JP 2023000975W WO 2023228466 A1 WO2023228466 A1 WO 2023228466A1
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- Prior art keywords
- steel plate
- meandering
- amount
- meandering control
- measuring
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 231
- 239000010959 steel Substances 0.000 title claims abstract description 231
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 title claims description 23
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 18
- 238000004364 calculation method Methods 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 238000005520 cutting process Methods 0.000 claims description 14
- 238000004804 winding Methods 0.000 claims description 9
- 238000000137 annealing Methods 0.000 claims description 7
- 238000005097 cold rolling Methods 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 description 18
- 230000007547 defect Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 230000002950 deficient Effects 0.000 description 4
- 230000037303 wrinkles Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- 210000001015 abdomen Anatomy 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- 238000012935 Averaging Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
- B65H23/032—Controlling transverse register of web
- B65H23/038—Controlling transverse register of web by rollers
Definitions
- the present invention relates to a meandering control method for a steel plate, a meandering control device, and a manufacturing method.
- a continuous steel plate manufacturing apparatus is equipped with a large number of deflector rolls for the purpose of changing the direction of progress of the steel plate.
- the significance of installing deflector rolls is to reduce the construction cost of continuous steel plate manufacturing equipment by making it more compact.
- a problem caused by installing a deflector roll is that the steel plate meanderes due to the frictional force of the deflector roll. Therefore, in order to suppress meandering of the steel plate due to the frictional force of the deflector roll, a CPC (Center Position Control) meandering control device is generally used. However, it is often impossible to use the CPC meandering control device due to cost and installation location constraints.
- Patent Document 1 discloses a method for predicting the amount of meandering of a steel strip from a real-time simulation of the amount of meandering of the steel strip upstream of the steering device and the motion of the steel plate, and controlling the steering device based on the predicted amount of meandering.
- a meandering control method for suppressing meandering of a steel strip has been proposed.
- the meandering amount on the upstream side of the steering device which is used to predict the meandering amount of the steel strip, is part of the shape information of the steel strip, and the meandering of the steel strip is suppressed. There is insufficient information to do so.
- the meandering control method described in Patent Document 1 attempts to compensate for this lack of information with real-time simulation, but there is no description of a simulation method and it has not been put to practical use.
- the meandering control method for a steel plate according to the present invention includes a measuring step of measuring the amount of out-of-plane deformation of the steel plate on the upstream side of a steering device that changes the conveyance direction of the steel plate, and the amount of out-of-plane deformation of the steel plate measured in the measuring step. a calculation step of calculating the average curvature of the steel plate using the calculation step, and calculating an off-center amount of the steel plate in the steering device using the average curvature of the steel plate calculated in the calculation step, and based on the calculated off-center amount. and controlling the winding position of the steel plate with respect to the steering device.
- the measuring step may include a step of measuring the amount of out-of-plane deformation of the steel plate on the exit side of a cutting device (edge trimmer) that is installed upstream of the steering device and cuts the widthwise end of the steel plate.
- a cutting device edge trimmer
- a meandering control device for a steel plate includes a steering device that changes the conveyance direction of the steel plate, a measuring device that measures an amount of out-of-plane deformation of the steel plate on the upstream side of the steering device, and a winding control device for the steel plate with respect to the steering device.
- a position adjustment device that adjusts a hanging position, and a control device that controls the position adjustment device, and the control device measures the average curvature of the steel plate using the amount of out-of-plane deformation of the steel plate measured by the measurement device.
- the off-center amount of the steel plate in the steering device is calculated using the calculated average curvature of the steel plate, and the position adjustment device is controlled based on the calculated off-center amount.
- the measuring device is preferably installed on the exit side of a cutting device that is installed upstream of the steering device and cuts the widthwise end of the steel plate.
- a method for manufacturing a steel plate according to a first aspect of the present invention includes a storage step of storing a steel plate in a looper device while suppressing meandering of the steel plate using a meandering control method for a steel plate according to the present invention; and a cold rolling step of cold rolling the steel plate.
- a method for manufacturing a steel plate according to a second aspect of the present invention includes a storage step of storing a steel plate in a looper device while suppressing meandering of the steel plate using a meandering control method for a steel plate according to the present invention; an annealing step of annealing the steel plate.
- the meandering control method and meandering control device for a steel plate according to the present invention can suppress meandering of a steel plate having a shape defect. Moreover, according to the method for manufacturing a steel plate according to the present invention, meandering of a steel plate having a shape defect can be suppressed, and the steel plate can be manufactured with a high yield.
- FIG. 1 is a block diagram showing the configuration of a steel plate production line to which a steel plate meandering control method and meandering control device according to an embodiment of the present invention are applied.
- FIG. 2 is a schematic diagram showing the configuration of the looper device shown in FIG. 1.
- FIG. 3 is a diagram showing an example of shape data of a steel plate measured by a measuring device.
- FIG. 4 is a diagram illustrating an example of the relationship between the maximum bending of the joint portion of steel plates and the occurrence of flaws.
- FIG. 5 is a diagram illustrating an example of a method for measuring the amount of out-of-plane deformation.
- Shape defects in steel sheets occur mainly due to non-uniformity in the width direction of elongation in the longitudinal direction during the rolling process.
- Shape defects of a steel plate include bending (one-sided elongation) and a combination of ear waves/belly elongation, etc., and the shape defect that has the greatest effect on meandering of a steel plate is bending.
- bending one-sided elongation
- ear waves/belly elongation etc.
- Equation (3) the average curvature K can be expressed as shown in equation (3) below.
- the first term on the right side of Equation (3) is the amount observed as meandering or oblique movement of the steel plate, and the second term on the right side is the amount observed as out-of-plane deformation of the steel plate. From Equation (3), it can be seen that even if only the meandering of the steel plate is observed, the bending (average curvature K) of the steel plate, which is closely related to the meandering of the steel plate, cannot be understood.
- the value of the first term on the right side is zero, so the average curvature K can be determined from the observed amount of out-of-plane deformation (second term on the right side).
- meandering occurs in a thin plate, it is often accompanied by out-of-plane deformation of the thin plate.
- equation (3) can be approximated as shown in equation (4) below, and equation (4) can be transformed as shown in equation (5) below.
- Equation (6) indicates the position in the width direction of the steel plate.
- differential elongation rate ⁇ l (x, y) of the steel plate can be defined as shown in the following equation (8).
- Equation (8) indicates the average length of the steel plate in the width direction, and is expressed as in Equation (9) below.
- b in formula (9) indicates the width of the steel plate.
- equation (10) can be approximated as equation (11) shown below, and when equation (11) is transformed, equation (12) shown below is obtained.
- the average bending curvature K 1 converted from the differential elongation rate ⁇ l (x, y) of the steel plate is defined by the following equation (14).
- Equation (15) corresponds to the second term on the right side of Equation (5)
- Equation (5) can be transformed into Equation (16) shown below.
- the average curvature K of the average bend can be determined from the curvature K1 .
- the curvature K1 can be calculated by substituting the measured value of the amount of out-of-plane deformation of the steel plate and its slope into Equation (14). Therefore, in the present invention, the amount of out-of-plane deformation of the steel plate and its slope are measured at a position where meandering of the steel plate does not occur, the average curvature K of the steel plate is calculated from the measured values, and the calculated average curvature K is used to calculate the amount of out-of-plane deformation of the steel plate and its slope.
- the off-center amount (the direction and amount of positional deviation of the widthwise center position of the steel plate with respect to the widthwise center position of the steering device when the steel plate reaches the steering device), and based on the calculated off-center amount.
- the amount of out-of-plane deformation is one of the indicators indicating the bending and one-sided elongation of the steel plate S.
- the methods shown in FIGS. 5(a) and 5(b) can be considered.
- the method shown in FIG. 5(a) involves applying a normal force to the steel plate S by winding the steel plate S around a roll 20 or pressing the steel plate S to smooth out the wrinkles, and then bend the steel plate S with the wrinkles smoothed out.
- the method shown in FIG. 5(b) is a method in which the steel plate S is made straight in the longitudinal direction (not meandering) and the bending (unilateral elongation) of the steel plate S is calculated from the height of the wrinkles in the steel plate S.
- the method shown in FIG. 5A it becomes difficult to measure the amount of out-of-plane deformation if the length in the longitudinal direction of the steel plate S to which wrinkles are smoothed out is short. Therefore, it is desirable to adopt the method shown in FIG. 5(b), and in this embodiment, the amount of out-of-plane deformation is measured (converted) using the method shown in FIG. 5(b).
- FIGS. 1(a) and 1(b) are block diagrams showing the configuration of a steel plate production line to which a steel plate meandering control method and meandering control device according to an embodiment of the present invention are applied.
- a steel plate production line to which the steel plate meandering control method and meandering control device according to an embodiment of the present invention is applied includes a cutting device 1 that cuts the widthwise ends of the steel plate.
- a looper device 2 that stores the steel sheets whose widthwise ends have been cut by the cutting device 1
- a cold rolling mill 3 that cold-rolls the steel sheets stored in the looper device 2.
- an annealing furnace 4 for annealing the steel sheets stored in the looper device 2 may be arranged.
- FIG. 2 is a schematic diagram showing the configuration of the looper device 2 shown in FIGS. 1(a) and 1(b).
- the looper device 2 is constituted by a horizontal looper including a deflector roll.
- a free looper FL is arranged at the most upstream part of the looper device 2
- a cutting device 1 (not shown) is located downstream of the free looper FL
- a bridle roll BR is downstream of the cutting device 1
- a first deflector roll #1DEF is further downstream of the cutting device 1 (not shown). is located.
- a first steering roll #1STR that also serves as a deflector is arranged downstream of the deflector roll #1DEF.
- Steering roll #1 STR is equipped with a CPC meandering control device.
- a loop car #1 LP car equipped with a second deflector roll is arranged downstream of the steering roll #1 STR.
- the loop car #1 LP car adjusts the length of the steel plate S between the rolls by moving in the left-right direction in the drawing.
- a second steering roll #2 STR that also serves as a deflector is placed on the downstream side of the loop car #1 LP car.
- Steering roll #2STR is equipped with a CPC meandering control device.
- a loop car #2LP car equipped with a third deflector roll is arranged downstream of the steering roll #2STR.
- the loop car #2 LP car adjusts the length of the steel plate S between the rolls by moving in the left-right direction of the drawing.
- a third steering roll #3STR which also serves as a deflector, is placed downstream of the loop car #2LP car.
- Steering roll #3STR is equipped with a CPC meandering control device.
- Support rolls that support the weight of the steel plate S are arranged at a pitch of 2.5 m between the deflector roll #1DEF and the loop car #1 LP car and between the steering roll #2STR and the loop car #2 LP car.
- functions are provided to support the weight of the steel plate S and to open and close when the loop car passes.
- Separator rolls are installed at a pitch of 15m.
- vertical guide rolls are installed near the support rolls at a predetermined pitch to suppress meandering.
- a meandering control device for a steel plate which is an embodiment of the present invention, includes a measuring device 11, a position adjusting device 12, and a control device 13.
- the measuring device 11 is composed of a shape meter such as a tertiary laser scanner, and is arranged upstream of the steering device that changes the conveyance direction of the steel plate. Specifically, in this embodiment, the measuring device 11 is arranged downstream of the cutting device 1 and upstream of the looper device 2 (steering roll). The measuring device 11 measures the shape data of the steel sheet including the amount of out-of-plane deformation of the steel sheet, and outputs an electric signal indicating the measured shape data to the control device 13.
- the location of the measuring device 11 is not limited to the downstream side of the cutting device 1 and the upstream side of the looper device 2, but may be placed at a location where no meandering of the steel plate occurs or where the amount of meandering of the steel plate is zero.
- the measuring device 11 is preferably placed at a position where the amount of meandering of the steel plate is such that it does not affect the measurement of the shape data of the steel plate (for example, the amount of meandering in the width direction of the steel plate is within ⁇ 20 mm). Moreover, when the cutting device 1 is not arranged, the measuring device 11 may be arranged upstream of the looper device 2.
- the position adjustment device 12 adjusts the winding position of the steel plate with respect to the steering roll in the looper device 2 according to the control signal output from the control device 13.
- the operator may manually adjust the winding position of the steel plate with respect to the steering roll.
- the control device 13 is constituted by an information processing device such as a computer, and controls the entire operation of the steel plate meandering control device by executing a computer program stored in advance.
- the control device 13 calculates the average curvature of the steel plate using the amount of out-of-plane deformation of the steel plate measured by the measuring device 11, and uses the calculated average curvature of the steel plate to turn off the steel plate in the steering roll.
- the center amount is calculated, and the position adjustment device 12 is controlled based on the calculated off-center amount.
- FIG. 3 is a diagram showing an example of shape data of a steel plate measured every 0.1 seconds by the measuring device 11. Since the shape data shown in FIG. 3 includes errors, the measuring device 11 may smooth the shape data to calculate a formula representing the curved surface of the steel plate, and use the calculated formula to calculate the average curvature of the steel plate.
- the steel plate meandering control device that is an embodiment of the present invention measures the amount of out-of-plane deformation of the steel plate on the upstream side of the steering device that changes the conveyance direction of the steel plate.
- the average curvature of the steel plate is calculated using the amount of out-of-plane deformation of the steel plate
- the off-center amount of the steel plate in the steering device is calculated using the calculated average curvature of the steel plate
- the steering device is adjusted based on the calculated off-center amount. Controls the winding position of the steel plate.
- meandering of a steel plate having a defective shape can be suppressed.
- this meandering control method it is possible to suppress meandering of a steel plate having a shape defect and to manufacture the steel plate with a high yield.
- Example 1 In this example, we will examine the flaws on steel plates when the meandering control according to the present invention is performed on a plurality of steel plates having different shapes (example) and when the meandering control according to the present invention is not implemented (comparative example, reference example). The presence or absence of occurrence was evaluated. The evaluation results are shown in Table 1 below. In the example, the winding position of the steel plate around the steering roll #1STR shown in FIG. 2 was controlled. As shown in Table 1, it was confirmed that by executing the meandering control of the present invention, it was possible to suppress the occurrence of flaws in the steel plate due to the meandering of the steel plate.
- Example 2 In this example, the relationship between the maximum bending of the joint of steel plates and the occurrence of flaws was evaluated. The evaluation results are shown in Figure 4.
- the horizontal axis indicates the plate width
- the vertical axis indicates the maximum bending of the steel plate
- white circles indicate joints without flaws
- black circles indicate joints with flaws.
- three flaws occurred at 52 joints, and it was confirmed that flaws occur when both the board width and bending are large.
- the sign of the bend indicates the direction in which the flaw will occur, and the value of the bend can predict the occurrence and direction of the flaw.
- a meandering control method and meandering control device for a steel plate that can suppress meandering of a steel plate having a shape defect. Further, according to the present invention, it is possible to provide a method for manufacturing a steel plate that can suppress meandering of a steel plate having a shape defect and manufacture the steel plate with a high yield.
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Abstract
Description
まず、本願発明の概念について説明する。
まず、図1,2を参照して、本発明の一実施形態である鋼板の蛇行制御方法及び蛇行制御装置が適用される鋼板の製造ラインの構成について説明する。
次に、図1を参照して、本発明の一実施形態である鋼板の蛇行制御装置の構成について説明する。
本実施例では、形状が異なる複数の鋼板について本発明に係る蛇行制御を実施した場合(実施例)及び本発明に係る蛇行制御を実施しなかった場合(比較例,参考例)における鋼板の疵の発生有無を評価した。評価結果を以下の表1に示す。実施例では、図2に示すステアリングロール#1STRに対する鋼板の巻掛位置を制御した。表1に示すように、本発明の蛇行制御を実行することにより、鋼板が蛇行して鋼板に疵が発生することを抑制できることが確認された。また、鋼板に曲がりがなければ、蛇行制御を実施しなくても鋼板は蛇行しないので、鋼板に疵は発生しないことが確認された(参考例)。また、鋼板に曲がりがあったとしても、鋼板の板幅とライン幅との差が0.4m以上であれば、鋼板が蛇行しても、鋼板はガイド縦ロールに衝突しないので、鋼板に疵が発生しないことが確認された(参考例)。
本実施例では、鋼板の接合部の最大曲がりと疵発生との関係を評価した。評価結果を図4に示す。図4において、横軸は板幅、縦軸は鋼板の最大曲がり、白丸は疵無しの接合部、黒丸は疵有の接合部を示す。図4に示すように、52個の接合部で3個の疵が発生し、板幅及び曲がりが共に大きい場合に疵が発生することが確認された。また、曲がりの正負は疵の発生方向を表しており、曲がりの値で疵の発生とその方向を予測できる。そこで、曲がりと板幅が所定値より大きい場合、下流のステアリングロールでわざと曲がりから予測される疵の発生方向とは逆方向に鋼板をオフセンターさせたところ、曲がり由来の疵が発生することを抑制できた。
2 ルーパー装置
3 冷間圧延機
4 焼鈍炉
11 測定装置
12 位置調整装置
13 制御装置
S 鋼板
Claims (6)
- 鋼板の搬送方向を変更するステアリング装置の上流側で鋼板の面外変形量を測定する測定ステップと、
前記測定ステップにおいて測定された鋼板の面外変形量を用いて鋼板の平均曲率を算出する算出ステップと、
前記算出ステップにおいて算出された鋼板の平均曲率を用いて、前記ステアリング装置における鋼板のオフセンター量を算出し、算出されたオフセンター量に基づいて前記ステアリング装置に対する鋼板の巻掛位置を制御する制御ステップと、
を含む鋼板の蛇行制御方法。 - 前記測定ステップは、前記ステアリング装置の上流側に設置された、鋼板の幅方向端部を切断する切断装置の出側で鋼板の面外変形量を測定するステップを含む、請求項1に記載の鋼板の蛇行制御方法。
- 前記鋼板の搬送方向を変更するステアリング装置と、
前記ステアリング装置の上流側で鋼板の面外変形量を測定する測定装置と、
前記ステアリング装置に対する鋼板の巻掛位置を調整する位置調整装置と、
前記位置調整装置を制御する制御装置と、
を備え、
前記制御装置は、前記測定装置によって測定された鋼板の面外変形量を用いて鋼板の平均曲率を算出し、算出された鋼板の平均曲率を用いて前記ステアリング装置における鋼板のオフセンター量を算出し、算出されたオフセンター量に基づいて前記位置調整装置を制御する、鋼板の蛇行制御装置。 - 前記測定装置は、前記ステアリング装置の上流側に設置された、鋼板の幅方向端部を切断する切断装置の出側に設置される、請求項3に記載の鋼板の蛇行制御装置。
- 請求項1又は2に記載の鋼板の蛇行制御方法を用いて鋼板の蛇行を抑制しつつ鋼板をルーパー装置に貯留する貯留工程と、
前記ルーパー装置に貯留された鋼板を冷間圧延する冷間圧延工程と、
を含む鋼板の製造方法。 - 請求項1又は2に記載の鋼板の蛇行制御方法を用いて鋼板の蛇行を抑制しつつ鋼板をルーパー装置に貯留する貯留工程と、
前記ルーパー装置に貯留された鋼板を焼鈍する焼鈍工程と、
を含む鋼板の製造方法。
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KR20040027080A (ko) * | 2002-09-27 | 2004-04-01 | 주식회사 포스코 | 수평식 루퍼의 스트립 센터링 장치 |
JP2007046131A (ja) * | 2005-08-11 | 2007-02-22 | Nippon Steel Corp | 金属ストリップの連続処理設備における操業支援装置、操業支援方法、コンピュータプログラム、及びコンピュータ読み取り可能な記録媒体 |
JP2014223973A (ja) * | 2013-05-16 | 2014-12-04 | 新日鉄住金エンジニアリング株式会社 | ステアリング装置、及び、鋼帯の蛇行制御方法 |
JP2017192943A (ja) * | 2016-04-18 | 2017-10-26 | Jfeスチール株式会社 | 鋼板の蛇行検出方法及び蛇行検出装置 |
JP2018192490A (ja) | 2017-05-15 | 2018-12-06 | 新日鐵住金株式会社 | 蛇行制御装置及び蛇行制御方法 |
JP2021194704A (ja) * | 2020-06-12 | 2021-12-27 | Jfeスチール株式会社 | 金属帯の蛇行制御方法及び蛇行制御装置 |
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