WO2019065360A1 - 鋼板の製造設備および鋼板の製造方法 - Google Patents
鋼板の製造設備および鋼板の製造方法 Download PDFInfo
- Publication number
- WO2019065360A1 WO2019065360A1 PCT/JP2018/034420 JP2018034420W WO2019065360A1 WO 2019065360 A1 WO2019065360 A1 WO 2019065360A1 JP 2018034420 W JP2018034420 W JP 2018034420W WO 2019065360 A1 WO2019065360 A1 WO 2019065360A1
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- WIPO (PCT)
- Prior art keywords
- steel plate
- roll
- shape
- pressing load
- drainage
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
- B21B45/0275—Cleaning devices
- B21B45/0278—Cleaning devices removing liquids
- B21B45/0281—Cleaning devices removing liquids removing coolants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-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
- B21B1/38—Metal-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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0071—Levelling the rolled product
-
- 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
- B21B39/006—Pinch roll sets
Definitions
- the present invention is a steel plate manufacturing facility and a steel plate manufacturing method for obtaining a high quality product by cooling a hot-rolled high-temperature steel plate online, and in particular, manufacturing a steel plate for manufacturing a steel plate excellent in flatness.
- the present invention relates to an installation and a method of manufacturing a steel plate.
- uneven cooling is likely to occur during cooling due to the difference in temperature distribution and shape or surface state of the steel plate immediately after rolling.
- uneven cooling that occurs in thick steel plates with relatively large thicknesses is likely to occur also due to the performance of the cooling device, and when uneven cooling occurs in thick steel plates, deformation of thick steel plates, residual stress, and material variation Etc. will occur.
- various cooling devices capable of uniform cooling have been developed, the improvement of only the cooling device, in particular, does not completely flatten the steel plate after cooling.
- the shape defect of the steel plate after cooling is also expensive because it requires troubles in operation such as passing through of the production line or the like, and an adjustment process with a press or a straightening machine in a post process.
- the uneven cooling of the steel plate may be attributed to the characteristics of the cooling nozzle such as temperature deviation in the upper and lower surfaces or temperature uniformity in the width direction, and to those caused by the shape of the steel plate before cooling.
- the first method is a method of performing shape correction before the accelerated cooling device to flatten the shape and ensure uniform cooling at the time of cooling.
- Patent Document 1 it is described that the shape of the steel plate is corrected by the first shape correction device to a shape that allows sufficient drainage by the drainage roller in the cooling device.
- patent document 2 in order to avoid the flatness defect after cooling by the heat recovery of a steel plate, it is described that the distance from a shape correction apparatus output side to the cooling apparatus entrance side is defined.
- the second method is a method of constraining with a drainage roll.
- the purpose of the drainage roll is 1) to flatten the steel plate by pressing with a roll, and 2) to prevent the leakage of cooling water jetted to the cooling area to the outside.
- Patent Document 3 is a technology that includes draining rolls that can move up and down individually and that the rolls move up and down according to the shape of a steel plate.
- Patent Document 4 is a technology for securing a water blocking effect of cooling water by narrowing the gap between the steel plate and the roll by pressing the drainage roll with a predetermined load or more and flattening the deformed steel plate to a predetermined amount. It is.
- Patent Documents 1 and 2 In recent years, there have been an increase in the number of production lines operated by techniques such as Patent Documents 1 and 2 in which a shape correction device is installed in front of a cooling device online.
- a cooling device that does not have a drainage roll, particularly on the upper surface side of the steel plate, the cooling water leaked from the cooling water injection area to the outside stays for a long time on the steel plate. Subcooling occurs in some places.
- the thickness is particularly thin such as thin (for example, 30 mm or less) and wide (for example, 3000 mm or more).
- shape defects due to rolling are likely to occur.
- it is difficult to properly contact the drainage roll with the steel plate to clamp the cooling water, and the cooling water leaks from the cooling water injection area to the outside on the steel plate upper surface side As a result, supercooling occurs, and a shape defect caused by a temperature deviation occurs.
- the present invention has been made in view of such circumstances, and a steel plate manufacturing facility and a steel plate manufacturing method capable of uniformly cooling a high temperature steel plate by on-line cooling and manufacturing a flat and homogeneous steel plate. Intended to be provided.
- the present inventors flatten the shape of the steel plate preferably to a predetermined steepness or less with the first shape correction device, and then restrain the steel plate appropriately with a drainage roll in the accelerated cooling device to achieve flatness. It has been found that it is possible to manufacture high-grade steel plates.
- the gist of the present invention is as follows. [1] A hot rolling mill, a first shape correction device, and an accelerated cooling device are arranged in this order, An acceleration cooling device is provided with a drainage roll, and the drainage roll restrains a steel plate up and down, and manufacture equipment of the steel plate which has a control mechanism which controls pressing load P for restraining a steel plate. [2]
- the pressing load P is a steel plate manufacturing facility according to [1], which satisfies the following formula (1).
- a high temperature steel plate can be uniformly cooled by on-line cooling, and a flat and homogeneous steel plate can be manufactured.
- FIG. 1 is a schematic view showing the configuration of the steel plate manufacturing equipment of the present invention.
- FIG. 2 is a schematic diagram which shows a mode that a steel plate flows to a 1st shape correction apparatus and an accelerated cooling device.
- FIG. 3 is a schematic view showing the state of the gap between the steel plate and the draining roll, where (a) is the case where the pressing load of the draining roll is insufficient and (b) is the case where the pressing load of the draining roll is excessive c) is the case where the pressing load of the water draining roll is appropriate.
- FIG. 4 is a graph showing the relationship between the pressing load and the deflection of the water draining roll.
- FIG. 5 is a diagram for explaining the definition of the steepness degree ⁇ .
- FIG. 6 is a graph showing the relationship between the degree of steepness and the pressing load in the presence or absence of coolant leakage, and is a graph with a roll diameter of 400 mm.
- FIG. 7 is a view showing a model of the pressing load of the water removing roll.
- FIG. 8 is a graph showing the relationship between the deflection parameter and the pressing load of the drainage roll in the presence or absence of leakage of the cooling water from the drainage roll.
- the manufacturing equipment of this invention is arrange
- the steel plate 5 is rolled by the hot rolling mill 1 and then corrected in shape by the first shape correction device 2 and then controlled and cooled by the accelerated cooling device 3, and is shaped by the second shape correction device 4 as necessary. Will be corrected.
- the arrow in a figure is a conveyance direction of a steel plate.
- FIG. 2 is a schematic view showing how the steel plate 5 flows in the first shape correction device 2 and the accelerated cooling device 3.
- the steel sheet 5 after rolling in the hot rolling mill 1 often has shape defects such as ear waves, and after being flattened by the first shape correction device 2, it is controlled and cooled by the accelerated cooling device 3.
- the accelerated cooling device 3 includes a draining roll 31 for restraining the steel plate 5 from above and below, a cooling nozzle 32 for injecting cooling water, and a pressing load control mechanism 33 for controlling the pressing load P of the draining roll 31. May be installed between the drainage rolls 31.
- FIG. 3 is a schematic diagram which shows the state of the clearance gap between the steel plate 5 and the draining roll 31.
- the shape of the steel plate is bad (for example, a convex shape downward in the width direction of the steel plate)
- the steel plate 5 is pressed against the drainage roller 31 in a deformed state. Therefore, if the pressing load is insufficient, for example, as shown in FIG. 3A, the steel plate 5 having a convex shape downward can not be flattened, and a gap is generated between the steel plate 5 and the drainage roller 31.
- the pressing load of the draining roll 31 is excessive, the draining roll 31 itself is bent and a gap is generated between the steel plate 5 and the draining roll 31 (FIG. 3 (b)).
- FIG. 4 is a graph showing the relationship between the pressing load and the deflection of the drainage roll when the drainage roll with a roll diameter of 300 mm (solid roll) and a drum length of 6 m is pressed against a steel plate with a width of 4000 mm. Deflection was measured with a feeler gauge. It is estimated that a gap of at least 1 mm or less is necessary to properly stop water with the drainage roll, but when the pressing load exceeds several tens of tons, the deflection of the drainage roll exceeds 1 mm and a load of about 100 tons is applied. In this case, a gap of about 6 mm is generated, and the function as a water draining roll can no longer be exhibited.
- the initial shape of the steel plate is flattened and the pressing load of the drainage roller 31 is made less than a certain value. It is considered necessary to limit and maintain a constant pressing load while passing through the steel plate.
- the draining roll 31 in the accelerated cooling device 3 had a cylinder length of 6000 mm, and as the roll diameter, solid rolls of 300 300 and 400 ⁇ , which are used for the draining roll of a general accelerated cooling device, were used.
- FIG. 6 is a graph showing the relationship between the degree of steepness and the pressing load in the presence or absence of coolant leakage, and is a graph with a roll diameter of 400 mm.
- ⁇ indicates that water did not leak from between the steel plate and the roll, and ⁇ indicates that water leaked from between the steel plate and the roll. The leakage of cooling water was checked visually.
- the deflection amount ⁇ of the central portion in the longitudinal direction of the drainage roller 31 can be calculated by the following equation.
- the inner diameter d of the water draining roll 31 may be set to 0 in the equation of the second moment of area I of the above-mentioned formula (4). From the above equation, it is considered that the deflection amount ⁇ of the drainage roll 31 caused by the width of the steel plate 5 and the dimensions of the drainage roll 31 is in proportion to the following parameters.
- the right side of the equation (5) is referred to as a deflection parameter.
- the steel plate has a thickness of 30 mm, the width is 2500 mm, 3500 mm, 5000 mm, both the solid roll and the hollow roll have a diameter of 400 mm (note that the inner diameter of the hollow roll is 32 mm and the thickness is 40 mm), and the roll length 6000 mm. And The presence or absence of leakage of the cooling water was visually confirmed, and it was determined that the cooling water leaked from between the steel plate and the roll ( ⁇ : poor).
- FIG. 8 is a graph showing the influence of the deflection parameter and the pressing load of the drainage roller 31 on the presence or absence of the leakage of the cooling water from the drainage roller 31. It can be seen that, as the deflection parameter is larger, the cooling water leaks at a lower pressing load. From FIG. 8, it is found that the following relationship is established when the limit of the coolant leakage occurrence is arranged.
- the lower limit value of the pressing load P is 1.0 ton or more because the distortion slightly remaining in the steel plate forced by the roller leveler is flattened to the extent that the water can be drained to the minimum by the pressing force of the drainage roll. It is preferable to do.
- the first shape correction device 2 may be either a reduction-type skin pass leveler or a repetitive bending-type roller leveler.
- a roller leveler capable of repeated bending which has a higher correction capability than a skin pass leveler having a low correction capability for longitudinal warpage generated at the front end portion of the steel plate 5.
- the steepness of the steel plate 5 it is preferable to correct the steepness of the steel plate 5 to less than 2.0%. More preferably, it is less than 1.0%.
- the accelerated cooling device 3 it is difficult to manage the flow rate in the width direction of the steel plate so as to be completely uniform. For this reason, it is preferable to further correct the steel plate 5 by the second shape correcting device 4 after the control cooling by the accelerated cooling device 3 because slight warpage may occur due to temperature unevenness at the time of controlled cooling.
- amendment by the roller leveler which can be bent repeatedly is preferable.
- the drainage roll 31 may have a hollow structure or a solid structure. From the viewpoint of reducing the deflection of the water draining roll 31, it is preferable to increase the rigidity of the roll, so a solid structure (solid roll) is preferable. Furthermore, it is also possible to reduce an additional pressing load such as oil pressure by the solid weight of the drainage roll itself by adopting a solid structure.
- the cooling nozzle 32 is not particularly limited, and, for example, a plurality of circular pipe jet nozzles, slit nozzles, flat nozzles, flat sprays, square sprays, full cone sprays, spray nozzles that spray single water such as oval spray, water of the same shape
- a mist spray nozzle mixed with air can be used.
- the pressing load control mechanism 33 may be any type that can apply a constant pressing pressure such as a spring type such as a spring or an air pressure or hydraulic pressure, but in the present invention, the drainage roller 31 does not bend. It is important to maintain the pressing load of the For this reason, a control mechanism capable of maintaining a constant pressing force is preferable.
- the spring type the pressing amount of the spring (spring) changes in accordance with the shape of the steel plate 5, and as a result, the pressing load also changes significantly. Therefore, in the case of the spring type control mechanism, the first shape In the shape correction of the steel plate by the correction device 2, it is necessary to keep the steepness of the steel plate low (preferably less than 1.0%). Therefore, a control mechanism using hydraulic pressure or pneumatic pressure that can expect a constant pressing load is preferable.
- the present invention is preferably applied to a steel plate having a plate thickness of 30 mm or less and / or a plate width of 3000 mm or more, and the occurrence of shape defects caused by rolling can be suppressed.
- a steel plate was manufactured using the manufacturing equipment shown in FIG.
- the steel sheet 5 with a thickness of 25 mm and a width of 3500 mm was manufactured by the hot rolling mill 1, and then the shape of the steel sheet 5 was corrected to a predetermined steepness by the first shape correction device 2 and conveyed to the accelerated cooling device 3. .
- the steepness of the steel plate 5 was controlled by adjusting the reduction setting of the first shape correction device 2. Further, if necessary, correction was performed by the second shape correcting device 4, and when distortion occurred after correction by the second shape correcting device 4, re-correction was performed by a cold correction machine.
- the accelerated cooling device 3 As the accelerated cooling device 3, as shown in FIG. 2, while the cooling nozzle 32 is arrange
- the pressing load control mechanism 33 is pneumatic.
- the drainage roll 31 was a hollow roll having a cylinder length of 6000 mm, an outer diameter of 400 mm, and an inner diameter of 320 mm.
- the temperature deviation in the steel plate width direction was confirmed, and from the viewpoint of obtaining a predetermined material, the temperature deviation in the steel plate width direction was determined to be within 25 ° C. With respect to materials whose temperature deviation exceeded 25 ° C., re-rectification was carried out with a cold corrector to the extent that the product specification was satisfied.
- the invention examples 1 and 2 are examples in which the pressing load of the water draining roll 31 is set to 10 ton which is equal to or less than the pressing load P (15.3 ton) represented by the formula (1) of the present invention.
- the steepness was 0.75% and 1.5%, respectively, and the temperature deviation in the width direction became 12 ° C. and 22 ° C., respectively, which were within the acceptable range.
- the steel plate was flat even after the correction by the second shape correction device 4, and the re-correction was unnecessary.
- no variation in tensile strength was found to be good.
- the temperature deviation is further improved in the invention example 1 in which the steepness of the steel plate is small.
- Comparative Examples 2 to 4 are examples in which the pressing load of the water draining roll 31 is set to 30 ton, which is larger than the pressing load P (15.3 ton) represented by the equation (1) of the present invention.
- a large temperature deviation (58 to 72 ° C.) occurs in the width direction regardless of the steepness of the steel plate 5. It is inferred that a large amount of staying water was observed particularly in the center in the width direction on the steel plate in the observation during the operation, and the cooling water could not be seized by the drainage roll 31. In addition, there is stagnant water at the central part in the width direction, and it seems that a large temperature deviation has occurred.
- the steel plate 5 before accelerated cooling is flattened by the first shape correction device 2 to have a steepness of 0.75% and then controlled cooling by the accelerated cooling device 3
- the plate width, the pressing load of the water draining roll 31, the temperature distribution of the steel plate after cooling, and the shape after that were examined (Inventive Examples 3 to 4 and Comparative Examples 5 to 6).
- the plate thickness was 30 mm, and the plate widths were 2000 mm and 5000 mm.
- the temperature deviation in the width direction was targeted to be within 25 ° C. in the plate width direction as in the first embodiment.
- the material whose temperature deviation exceeded 25 ° C. was recorrected again by the cold corrector.
- the invention example 3 is a case where the pressing load of the water discharging roll 31 is set to 30 ton, which is lower than the pressing load P (34.5 ton) represented by the formula (1) of the present invention.
- the temperature deviation in the width direction was as small as 18 ° C., which was within the acceptable range, and the correction by the second shape correction device 4 was unnecessary.
- Comparative Example 5 is an example in which the pressing load of the water removing roll is 50 tons larger than the pressing load P (34.5 ton) represented by the formula (1) of the present invention. In Comparative Example 5, a large temperature deviation (100 ° C.) was generated in the plate width direction.
- the invention example 4 is a case where the pressing load of the drainage roll 31 is set to 15 tons lower than the pressing load P (19.7 tons) represented by Formula (1) of this invention.
- the temperature distribution in the width direction was as good as 10 ° C., and the shape of the steel plate was flat even after the correction by the second shape correction device 4.
- the temperature deviation was 100 ° C., and large supercooling occurred.
- Comparative Example 6 a large amount of staying water is observed particularly in the center in the width direction on the steel plate, and it is surmised that the water can not be stopped by the drainage roll 31.
- the steel plate of Comparative Example 6 generated a large strain after the correction by the second shape correction device 4, so re-correction is required by the cold correction machine, and additional manufacturing cost occurs. Oops. Furthermore, in mechanical tests, the tensile strength was widely dispersed.
- the temperature distribution of the steel plate can be made uniform by restraining the steel plate with a predetermined pressing load with the drainage roll, and a steel plate excellent in flatness can be obtained. It can be seen that it is possible to make the temperature distribution of the steel plate uniform by changing the pressing load appropriately according to the sheet width, and to manufacture a steel plate excellent in flatness.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
- Metal Rolling (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
[1]熱間圧延機、第一の形状矯正装置、加速冷却装置がこの順序で配置され、
加速冷却装置は水切りロールを備え、水切りロールは鋼板を上下に拘束し、鋼板を拘束するための押し付け荷重Pを制御する制御機構を有する鋼板の製造設備。
[2]押し付け荷重Pは、下記式(1)を満たす[1]に記載の鋼板の製造設備。
P≦37×((L-W)×W2/(D4-d4))-1.25・・・(1)
なお、
P:押し付け荷重(ton)
L:ロール胴長(mm)
W:板幅(mm)
D:ロール外径(mm)
d:ロール内径(mm)
である。
[3]加速冷却装置に次いで、第二の形状矯正装置が配置される[1]または[2]に記載の鋼板の製造設備。
[4]第一の形状矯正装置および/または第二の形状矯正装置は、ローラーレベラーである[1]~[3]のいずれかに記載の鋼板の製造設備。
[5]第一の形状矯正装置は、鋼板の急峻度を2.0%未満に矯正する[1]~[4]のいずれかに記載の鋼板の製造方法。
[6]熱間圧延機、第一の形状矯正装置、加速冷却装置がこの順序で配置され、鋼板を熱間圧延機で圧延した後、第一の形状矯正装置で鋼板の形状を矯正し、次いで加速冷却装置では、水切りロールにて所定の押し付け荷重Pで鋼板を上下に拘束しつつ、鋼板を冷却する鋼板の製造方法。
[7]押し付け荷重Pは、下記式(1)を満たす[6]に記載の鋼板の製造方法。
P≦37×((L-W)×W2/(D4-d4))-1.25・・・(1)
なお、
P:押し付け荷重(ton)
L:ロール胴長(mm)
W:板幅(mm)
D:ロール外径(mm)
d:ロール内径(mm)
である。
[8]加速冷却装置に次いで、第二の形状矯正装置が配置され、第二の形状矯正装置で鋼板の形状をさらに矯正する[6]または[7]に記載の鋼板の製造方法。
[9]第一の形状矯正装置および/または第二の形状矯正装置は、ローラーレベラーである[6]~[8]のいずれかに記載の鋼板の製造方法。
[10]第一の形状矯正装置では、鋼板の急峻度を2.0%未満に矯正する[6]~[9]のいずれかに記載の鋼板の製造方法。
λ=(δ/p)×100・・・(2)
ただし、式(2)において、
λ:急峻度(%)
δ:波高さ(mm)
p:波ピッチ(mm)
である。
L:水切りロールの胴長(mm)
W:板幅(mm)
E:水切りロールのヤング率(=21ton/mm2)
I:断面二次モーメント(mm4)
なお、中空ロールの場合、断面二次モーメントIは以下の式で記載できる。
d:水切りロール内径(mm)
π:円周率
また、中実ロールの場合は、上記式(4)の断面二次モーメントIの式において、水切りロール31の内径dを0とすればよい。上記式から、鋼板5の幅や水切りロール31の寸法に起因する水切りロール31の撓み量δは、以下のパラメータと比例関係にあると考えられる。
P≦37×((L-W)×W2/(D4-d4))-1.25・・・(1)
なお、
P:押し付け荷重(ton)
L:ロール胴長(mm)
W:板幅(mm)
D:ロール外径(mm)
d:ロール内径(mm)
である。
2 第一の形状矯正装置
3 加速冷却装置
31 水切りロール
32 冷却ノズル
33 押し付け荷重制御機構
4 第二の形状矯正装置
5 鋼板
W 板幅
L ロール胴長
P 押し付け荷重
δ 波高さ
p 波ピッチ
Claims (10)
- 熱間圧延機、第一の形状矯正装置、加速冷却装置がこの順序で配置され、
加速冷却装置は水切りロールを備え、水切りロールは鋼板を上下に拘束し、鋼板を拘束するための押し付け荷重Pを制御する制御機構を有する鋼板の製造設備。 - 押し付け荷重Pは、下記式(1)を満たす請求項1に記載の鋼板の製造設備。
P≦37×((L-W)×W2/(D4-d4))-1.25・・・(1)
なお、
P:押し付け荷重(ton)
L:ロール胴長(mm)
W:板幅(mm)
D:ロール外径(mm)
d:ロール内径(mm)
である。 - 加速冷却装置に次いで、第二の形状矯正装置が配置される請求項1または2に記載の鋼板の製造設備。
- 第一の形状矯正装置および/または第二の形状矯正装置は、ローラーレベラーである請求項1~3のいずれかに記載の鋼板の製造設備。
- 第一の形状矯正装置は、鋼板の急峻度を2.0%未満に矯正する請求項1~4のいずれかに記載の鋼板の製造設備。
- 熱間圧延機、第一の形状矯正装置、加速冷却装置がこの順序で配置され、
鋼板を熱間圧延機で圧延した後、第一の形状矯正装置で鋼板の形状を矯正し、次いで加速冷却装置では、水切りロールにて所定の押し付け荷重Pで鋼板を上下に拘束しつつ、鋼板を冷却する鋼板の製造方法。 - 押し付け荷重Pは、下記式(1)を満たす請求項6に記載の鋼板の製造方法。
P≦37×((L-W)×W2/(D4-d4))-1.25・・・(1)
なお、
P:押し付け荷重(ton)
L:ロール胴長(mm)
W:板幅(mm)
D:ロール外径(mm)
d:ロール内径(mm)
である。 - 加速冷却装置に次いで、第二の形状矯正装置が配置され、第二の形状矯正装置で鋼板の形状をさらに矯正する請求項6または7に記載の鋼板の製造方法。
- 第一の形状矯正装置および/または第二の形状矯正装置は、ローラーレベラーである請求項6~8のいずれかに記載の鋼板の製造方法。
- 第一の形状矯正装置では、鋼板の急峻度を2.0%未満に矯正する請求項6~9のいずれかに記載の鋼板の製造方法。
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CN114728320A (zh) * | 2019-11-25 | 2022-07-08 | 杰富意钢铁株式会社 | 钢板的制造设备及制造方法 |
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