WO2015182051A1 - 熱延鋼板の製造方法、鋼板切断位置設定装置、鋼板切断位置設定方法、及び鋼板製造方法 - Google Patents
熱延鋼板の製造方法、鋼板切断位置設定装置、鋼板切断位置設定方法、及び鋼板製造方法 Download PDFInfo
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- crop
- cutting
- cutting position
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- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- 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
Definitions
- the present invention is a method for producing a hot-rolled steel sheet that performs a finish rolling step after cutting the front end of the steel sheet in the transport direction and the rear end of the transport direction of the steel sheet before finish rolling after the rough rolling process
- the present invention relates to a steel sheet cutting position setting device for setting a cutting position, a steel sheet cutting position setting method, and a steel sheet manufacturing method, and is particularly suitable for reducing a crop cutting load when manufacturing a thick-walled and wide hot-rolled steel sheet.
- thick and wide refer to a case where the plate thickness is 20 to 30 mm and the plate width is 1200 to 2100 mm, respectively.
- a steel sheet is used to stabilize the transport of the steel sheet (also referred to as a passing plate) during finish rolling.
- Cutting of unsteady deformation portions called crop portions formed in a rough rolling process at the front end portion and the rear end portion of the steel sheet conveying direction (which is also the rolling direction) of the (sheet bar, intermediate material) is performed.
- the front end portion and the rear end portion in the conveyance direction of the steel sheet are deformed into various shapes by width reduction by a sizing press, width rolling by a width rolling mill, horizontal rolling by a rough rolling mill, and the like.
- FIG. 1 shows an example of the contour (planar shape) of the crop portion when the front end portion and the rear end portion in the transport direction of the steel plate are viewed from above.
- the shape of FIG. 1A is called a fish tail
- the shape of FIG. 1B is called a tongue.
- the width direction center part protrudes in the conveyance direction with respect to the width direction both ends of a steel plate.
- both end portions in the width direction protrude in the transport direction with respect to the center portion in the width direction of the steel plate.
- the portion A shown in FIG. 1A is referred to as a fishtail-shaped concave bottom, and the portion B is referred to as a fishtail-shaped convex tip.
- the length from the fishtail-shaped recess bottom (A portion) to the tip of the projection (B portion) may be referred to as the fishtail length.
- the fishtail shape is asymmetric and the left and right fishtail lengths are different, the shorter one of the two is defined as the fishtail length.
- the planar shape of the cropped part may be asymmetric on both sides in the width direction with respect to the center in the width direction of the steel sheet as shown in FIG. 1 (c) and FIG. 1 (d).
- the steel plate formed with the asymmetrical crop portion in the width direction is passed through the finish rolling mill in the steel plate conveyance direction front end portion or rear end portion, an uneven load in the steel plate width direction is generated in the finish rolling roll.
- the steel sheet may meander during finish rolling.
- the temperature is greatly decreased because heat escapes from the four surfaces of the front end surface in the transport direction, the end surface in the width direction, the upper surface, and the lower surface, and the temperature is lower than that in the steady portion.
- This low temperature steel sheet conveyance direction front end portion has a large deformation resistance, which causes a biting failure in the finishing mill.
- the temperature is greatly decreased because heat escapes from the four surfaces of the conveyance direction rear end surface, the width direction end surface, the upper surface, and the lower surface, and the temperature is lower than that of the steady portion.
- the rear end portion in the steel plate conveying direction at a low temperature also has a large deformation resistance, and the steel plate is easily drawn during finish rolling.
- the front end of the steel sheet in the transport direction and the cropped portion at the rear end of the transport direction are cut.
- the crop part is cut by a crop cutting machine (also referred to as a crop shear).
- the first is the thickness of the steel sheet.
- the thickness of the intermediate material (sheet bar) before finish rolling is 30 to 50 mm.
- controlled rolling called TMCP (Thermo-Mechanical Control Process) is performed to refine the crystal structure and ensure the toughness of the steel sheet.
- TMCP Thermo-Mechanical Control Process
- the product sheet thickness required for the hot rolled steel sheet for line pipe material is 20 mm or more and 30 mm or less, and in order to obtain the toughness required for the line pipe material, the cumulative rolling reduction in finish rolling is required to be at least 60%.
- the second important point to keep in mind when manufacturing hot-rolled steel sheets for line pipe materials on a hot-rolled steel sheet production line is the sheet width of the steel sheet (intermediate material).
- the line pipe material may be manufactured as a spiral steel pipe.
- a wider hot-rolled steel sheet is required as a pipe material.
- the plate width required as a hot-rolled steel plate for line pipe materials is 1200 mm or more and 2100 mm or less, and the crop cutting machine needs to cut the crop portion of the intermediate material having a plate width of 1200 mm or more.
- the third important point to keep in mind when manufacturing a hot-rolled steel sheet for line pipe materials in a hot-rolled steel sheet production line is the temperature of the steel sheet (intermediate material).
- finish rolling In order to obtain a hot rolled steel sheet having high toughness, finish rolling must be performed at a temperature in the non-recrystallized region. For this reason, it is necessary to perform finish rolling by setting the sheet thickness center temperature of the steel sheet to 930 ° C. or less from the front end in the transport direction to the rear end in the transport direction. Therefore, the temperature of the crop portion at the cutting position is close to 930 ° C.
- the hot-rolled steel sheet for line pipe material (intermediate material) has a higher cutting resistance value than conventional steel sheets, and the cutting load increases.
- the hot-rolled steel sheet for line pipe material manufactured in the hot-rolled steel sheet production line has a large plate thickness, large plate width, and low temperature.
- a crop cutting machine applies a larger cutting load than a general hot-rolled steel sheet.
- the specifications of the existing crop cutting machine are designed to match the conventional hot-rolled steel sheet that has been manufactured in the past, and hot rolling for line pipe materials is possible without major modification of the crop cutting machine such as enhancement.
- a technique for cutting a steel plate having a plate thickness of 50 mm or more, a plate width of 1200 mm or more and a temperature of 930 ° C. or less is required even in the specifications of the existing crop cutting machine.
- the yield can be improved because it is possible to roll without cutting the front end portion of the steel sheet in the conveying direction and the crop portion at the rear end portion in the conveying direction, or even when cutting, the minimum cutting length is required.
- Patent Document 2 after measuring the shape of the cropped portion of the steel sheet (intermediate material) before cutting in the conveyance direction front end portion and the conveyance direction rear end portion with a shape meter, the finish rolling machine bites from the measured shape.
- a method has been proposed in which an optimum cutting length is determined in consideration of defects and quality / yield, and the cropped portion is cut with the cutting length. This method improves the quality and the yield as well as reducing the troubles of the plate passing.
- JP-A-62-173115 Japanese Patent Laid-Open No. 7-9245
- An object of the present invention is to provide a hot-rolled steel sheet manufacturing method, a steel sheet cutting position setting device, a steel sheet cutting position setting method, and a steel sheet manufacturing method that can stably cut a steel sheet without performing the above steps.
- the inventors of the present invention have adopted a fishtail shape as the shape of the crop portion at the front end portion and the rear end portion in the steel plate conveyance direction formed in the rough rolling step before finish rolling.
- a fishtail shape As shown in FIG.
- the conventional crop cutting position is a position where the entire width of the steel sheet is cut.
- the middle of the fishtail-shaped concave bottom and convex tip If the part is cut, the cutting width is reduced compared to the case of cutting the entire width of the steel sheet, so that the cutting load is reduced.
- the target cutting position of the fishtail-shaped crop portion may be set.
- the cutting load upper limit value of the crop cutting machine is exceeded even though the blade of the crop cutting machine is swung down aiming, or the blade is swung without contacting the fish tail shape of the crop section. Therefore, by making the fishtail length sufficiently long, even if an error occurs between the target cutting position and the actual cutting position, the upper limit of the cutting load of the crop cutting machine is not exceeded, or the idle swing is performed. Do not.
- the target cutting position since an error occurs between the target cutting position and the position where the blade of the crop cutting machine actually contacts the steel plate, the target cutting position must be set in view of the error. Even when the cutting position of the crop cutting machine deviates from the target cutting position, it is necessary to set a target cutting position so that the blade of the crop cutting machine can be swung down without touching the uncuttable position or without swinging. .
- the present invention has been made on the basis of the above findings and has the following gist. (1) It has a rough rolling step and a finish rolling step, and after the rough rolling step, before the finish rolling step, either one or both of the front end and the rear end in the transport direction of the steel sheet were cut.
- the shape of the crop portion formed in the portion is a fishtail shape, and the length from the bottom of the fishtail shape to the top of the convex portion is 200 to 300 mm, and the bottom of the concave portion and the convex portion
- the target cutting position is set between a position of 110 mm from the fishtail-shaped concave bottom to the top of the convex and a position of 90 mm from the convex to the bottom of the concave.
- the method for producing a hot-rolled steel sheet according to (1) [1] It has a rough rolling step and a finish rolling step, and after the rough rolling step and before the finish rolling step, after cutting the crop portion at the front end portion in the conveying direction of the steel sheet, the finish rolling step is performed.
- the shape of the crop part formed at the front end in the conveying direction of the steel sheet is obtained by width rolling by a width rolling mill and horizontal rolling by a horizontal roughing mill.
- a fishtail shape is formed, and the fishtail shape is molded so that the shortest length L (mm) from the bottom of the concave portion to the tip of the convex portion satisfies the following formula (1).
- a method for producing a hot-rolled steel sheet comprising cutting a portion as a target cutting position. (2X + 30) ⁇ L ⁇ 300 (1)
- X Maximum error (mm) of the cutting position of the crop cutting machine 0 ⁇ X ⁇ 90
- the shape of the crop portion formed at the rear end portion in the transport direction of the steel sheet satisfies the above formula (1) in addition to the crop portion formed at the front end portion in the transport direction of the steel plate.
- the target cutting position is a position of (X + 20) mm from the fishtail-shaped concave bottom to the convex tip direction, and (X + 5) mm from the convex tip to the concave bottom direction.
- the width reduction amount W P (mm) of the sizing press is less than 150 mm or more than 250 mm and less than or equal to 400 mm, and the width rolling amount W R (mm) by the width rolling mill is 30 to 50 mm.
- the crop portion having a fishtail shape and formed by rough rolling at the front end portion or the rear end portion in the transport direction of the steel sheet is subjected to a crop cutting machine before finish rolling.
- a processing unit having an arithmetic processing function when cutting, a steel plate cutting position setting device for setting the cutting position of the crop part, and a crop part shape for reading the shape of the crop part detected by a crop shape meter The reading part, the temperature distribution reading part for reading the temperature distribution of the crop part detected by the crop thermometer, and the shape of the read crop part from the bottom of the fishtail-shaped concave part toward the tip of the convex part
- a first cutting position calculation unit that calculates a position of the length in the steel sheet conveyance direction set in advance as a first cutting position, and the temperature distribution of the read crop unit in the crop unit
- a crop cutting machine that has a fishtail shape and is formed by rough rolling at the front end portion or the rear end portion in the transport direction of the steel plate before finish rolling.
- a steel plate cutting position setting method for setting the cutting position of the crop part with an arithmetic processing device having an arithmetic processing function when cutting with a crop part for reading the shape of the crop part detected by the crop shape meter From the shape reading step, the crop temperature distribution reading step to read the temperature distribution of the crop portion detected by the crop thermometer, and the shape of the read crop portion from the bottom of the fishtail-shaped recess to the tip of the convex
- Cutting load distribution calculating step to calculate the cutting load distribution in the steel plate conveying direction in the crop part from the cutting load distribution in the steel plate conveying direction in the crop part, the cutting load of the crop part is the cutting of the crop
- Steel cutting position setting method and a crop portion cut position setting step of setting a portion between the concave side cut position as a cutting position of the crop portions are provided.
- width reduction is performed using a sizing press or a width rolling mill in order to make the shape of the crop portion at the front end portion in the conveyance direction or the rear end portion in the conveyance direction of the steel plate into a fishtail shape.
- a steel sheet manufacturing method is provided.
- the fishtail-shaped concave bottom and the middle of the convex tip are cut so that the plate thickness is large, the plate width is large, and the temperature is Even a low steel plate can be cut with a cutting load equivalent to that of a conventional steel plate having a general thickness, width and temperature.
- a steel plate with a large plate thickness of 50 to 100 mm, a plate width of 1200 to 2100 mm, and a low temperature of 800 to 1050 ° C. can be cut without major equipment modification such as enhancement of a crop cutting machine. can do.
- leading edge of the steel sheet in the conveying direction and the trailing edge of the conveying direction can be arranged perpendicular to the direction of entry into the finishing mill, and the temperature-lowering part due to the four-sided cooling can be removed, so that in the finishing mill The stability of the plate can be secured.
- the fishtail length is made long so that the blade of the crop cutting machine does not touch the uncut position of the steel plate, so there is an error between the target cutting position and the position where the blade of the crop cutting machine actually contacts the steel plate. Even when this occurs, it is possible to always cut the fishtail-shaped concave bottom and the middle of the convex tip without exceeding the upper limit of the cutting load of the crop cutter.
- the target cutting position is determined so that the blade of the crop cutting machine does not come into contact with the uncut position of the steel sheet and the blade is not swung at the time of cutting. Therefore, the upper limit of the cutting load of the crop cutting machine is always exceeded.
- the present invention it is possible to stably cut the fishtail-shaped recess bottom and the intermediate portion of the protrusion tip without swinging. According to the present invention, even a steel plate having a large plate thickness, a large plate width, and a low temperature can be prevented from being cut due to insufficient capacity of the crop cutting machine. In addition, the steel sheet can be stably cut without major equipment modification such as enhancement of a crop cutting machine.
- FIG. 1 It is a schematic block diagram which shows one Embodiment of the hot rolling equipment to which the steel plate cutting position setting apparatus of this invention, the steel plate cutting position setting method, and the steel plate manufacturing method were applied. It is explanatory drawing of the crop part formed in the conveyance direction front-end
- the manufacturing process of a hot-rolled steel sheet is a process of manufacturing a steel strip from a slab, and is roughly divided into a heating process, a rough rolling process, a finish rolling process, a cooling process, and a winding process in the order of processes.
- the heating process side will be described as the upstream side
- the winding process side will be described as the downstream side.
- width rolling and horizontal rolling are performed by a width rolling mill and a rough rolling mill each provided with at least a pair of rolls on the slab that has been conveyed.
- the width rolling mill is provided on the upstream side and the downstream side of the rough rolling mill, or on either the upstream side or the downstream side.
- Width rolling and horizontal rolling may be performed in the forward direction toward the downstream process side or may be performed backward toward the upstream process side. Further, in the rough rolling step, width rolling and horizontal rolling may be performed only in the forward direction, or the forward and reverse operations may be repeated at least twice.
- the slab is formed into a sheet bar having a predetermined plate width and thickness by the above operation.
- a sizing press for deteriorating the slab in the width direction may be installed upstream of the rough rolling mill.
- This sizing press is used when the width of the slab is greatly reduced because the width reduction efficiency of the slab is better than that of the width rolling mill.
- the sheet bar is horizontally rolled using a finish rolling mill having at least one horizontal rolling mill having a pair of upper and lower rolls. The horizontal rolling at this time is performed in one direction.
- a cooling process is a process of injecting water from the upper and lower sides to the steel plate after finish rolling being conveyed and cooling it.
- the winding process is a process in which the cooled steel sheet is wound into a cylindrical shape by a coiler.
- the sheet bar refers to a steel plate after the rough rolling process and before finish rolling.
- the front and rear end portions in the conveying direction of the sheet bar are deformed into various shapes by horizontal rolling in the rough rolling process, width rolling, and width reduction by a sizing press to form a crop portion.
- FIG. 1B there is a tongue-shaped crop part in which the center part of the sheet width extends longer in the rolling direction than the end part of the sheet width.
- there is a fishtail-shaped crop portion in which the end portion of the plate width extends longer in the rolling direction than the central portion of the plate width as shown in FIG.
- the left and right are asymmetrical, and there are also a right and left asymmetric tongue shape as shown in FIG. 1C and a left and right asymmetric fishtail shape as shown in FIG.
- the shape of the cropped portion at the front end and the rear end of the sheet bar in the conveying direction is the amount of width rolling in the width rolling mill, the amount of rolling in the horizontal roughing mill, the number of passes in the rough rolling step, and the sizing press.
- a desired shape can be obtained by adjusting the width reduction amount by.
- the shape of the crop portion at the front end portion and the rear end portion in the conveying direction of the sheet bar is a fishtail shape as shown in FIG.
- the width rolling by the width rolling machine and the width reduction by the sizing press are processes for deforming the end portion of the sheet width before the horizontal rolling by rough rolling.
- At least one width rolling mill, at least one sizing press, or a width rolling mill and a sizing press in the rough rolling process need to be installed at least one machine.
- the cutting method of the crop cutter is generally divided into three types: guillotine type, crank type, and drum type, but it is possible to cut the front and rear end crops of the sheet bar in the width direction. Any cutting method may be used.
- the cutting load applied to the crop cutting machine is affected by the thickness of the portion where the blade of the crop cutting machine contacts during cutting. This plate thickness is called the cutting thickness. In general, since the plate thickness of the sheet bar is constant in the rolling direction, the cut thickness may be considered to be equal to the plate thickness of the steady portion of the sheet bar.
- the thickness of the sheet bar set according to the schedule may be set as the cutting thickness.
- the cutting load is reduced by cutting the fishtail-shaped concave bottom of the crop portion formed in the sheet bar and the middle portion of the convex tip.
- the intermediate portion refers to a portion at a position in a region between the fishtail-shaped concave bottom and the convex tip.
- the cutting load applied to the crop cutting machine is affected by the total length of the part where the blade of the crop cutting machine contacts the sheet bar during cutting. This total length is called the cutting width.
- the maximum cutting width is equal to the plate width of the steady part of the sheet bar.
- the cut width is significantly smaller than the plate width of the steady portion.
- the sheet bar width measured by the measuring device or the rough rolling schedule may be set as the maximum cutting width.
- the cutting load is reduced by cutting the fishtail-shaped recess bottom of the crop portion formed in the sheet bar and the middle portion of the protrusion tip.
- the cutting load applied to the crop cutting machine is affected by the temperature of the sheet bar at the contact portion when the blade of the crop cutting machine contacts during the cutting.
- This temperature is called the cutting temperature.
- the set temperature of the set sheet bar may be set as the cutting temperature. When this cutting temperature is 1050 ° C. or lower, the cutting load is reduced by cutting the fishtail-shaped concave bottom of the crop portion and the middle of the convex tip formed on the sheet bar.
- the length from the fishtail-shaped concave bottom to the convex tip is 200 mm or more. From the viewpoint of product yield, the upper limit of the length is set to 300 mm.
- the width reduction press amount and width of the sizing press The rolling width of the rolling mill must be changed from the conventional conditions.
- the full width of the sheet bar is cut by using the positions where the front and rear end cropping portions of the sheet bar are cut as the steady deformation portion of the sheet bar. Therefore, the yield was improved by shortening the crop length and reducing the cutting amount.
- the width reduction press amount of the sizing press and the width rolling amount of the width rolling machine are the length from the bottom of the fishtail-shaped concave portion to the front end of the convex portion of the crop portion formed at the front end portion and the rear end portion of the sheet bar in the conveying direction. was set to be shorter.
- the convex part protrudes from the fishtail-shaped concave bottom. It is necessary to increase the length to the tip of the part, and it is necessary to change the conditions of the conventional sizing press and width rolling.
- the width reduction press amount is about 200 mm. It is desirable to make it.
- the width reduction press amount is 200 mm or less, only the width end portion of the slab is deformed by the width reduction and the thickness of the width end portion is increased, so that the horizontal rolling is performed by subsequent rough rolling as the width reduction press amount increases. Further, the length from the bottom of the fishtail-shaped concave portion of the crop portion formed at the front end portion and the rear end portion of the sheet bar to the front end of the convex portion is increased.
- the thickness of the center portion of the slab width is increased because the width reduction causes deformation to the center portion of the slab width.
- the fishtail-shaped recess of the crop part formed at the leading and trailing ends of the sheet bar in the conveying direction because the thickened part at the center of the slab width is stretched in the rolling direction by horizontal rolling by a roughing mill after width reduction pressing
- the length from the bottom to the tip of the convex portion is shortened.
- the length from the bottom of the fishtail-shaped recess to the tip of the convex portion of the crop portion formed at the leading and trailing ends of the sheet bar in the conveying direction is the maximum when the width reduction press amount is 200 mm. It turns out that it becomes the length of.
- the width rolling amount of each pass Is as large as possible.
- width rolling only the width end portion of the material to be rolled (slab) is deformed. Therefore, if the amount of width rolling is increased, only the thickness of the width end portion of the slab before horizontal rolling performed by the rough rolling mill is increased. As a result, the length from the bottom of the fishtail-shaped concave portion of the crop portion formed at the front end portion and the rear end portion of the sheet bar in the conveyance direction becomes longer.
- the width rolling was performed so that the difference between the sheet width after the sizing press and the sheet width of the sheet bar after the rough rolling was 20 mm or less.
- the fishtail-shaped concave bottom It is necessary to increase the length to the tip of the convex part, and the width rolling must be performed by setting the difference between the sheet width after the sizing press and the sheet width of the sheet bar after the rough rolling to 20 mm or more.
- the method for increasing the length from the bottom of the fishtail-shaped concave portion of the crop portion formed at the front end portion and the rear end portion of the sheet bar to the front end of the convex portion is a method using a sizing press.
- There is a method using a width rolling mill and the length from the bottom of the fishtail-shaped concave portion to the tip of the convex portion is made to be 200 mm or more by using these two methods or any one of them.
- the fishtail-shaped recess bottom and convexity may vary depending on the sheet bar width, thickness, and cutting temperature.
- a load exceeding the upper limit of the cutting load of the crop cutting machine may be generated despite the cutting of the middle part of the tip of the part.
- the cutting width changes depending on the cutting position. That is, even when an intermediate portion between the fishtail-shaped concave bottom and convex tip is cut, the cutting load varies depending on the cutting position, so the cutting load changes. If the cutting width is long, the cutting load is large, and if the cutting width is short, the cutting load is small. Therefore, the closer to the fishtail-shaped recess bottom, the larger the cutting load.
- a cutting position where the cutting load exceeds the upper limit of the cutting load of the crop cutting machine is defined as a non-cuttable position.
- the uncuttable position is formed between the bottom of the recess and the top of the convex portion slightly beyond the bottom of the fishtail-shaped recess from the steady deformation portion of the seat bar toward the top of the fishtail-shaped projection. It exists also in the middle portion, and is located within a region within 20 mm from the bottom of the fishtail-shaped recess to the tip of the projection.
- an error occurs between the target cutting position of the sheet bar and the position where the blade of the crop cutting machine actually contacts the sheet bar.
- the error depends on the accuracy of sheet bar tracking and is ⁇ 90 mm at the maximum.
- the target cutting position is set to a position closer than 110 mm from the bottom of the fishtail-shaped recess to the tip of the projection, the blade of the crop cutter actually contacts the sheet bar as shown in FIG.
- the position is shifted from the target cutting position by 90 mm toward the bottom of the recess, the blade of the crop cutting machine may come into contact with the uncuttable position of the fishtail shape.
- the target cutting position is set to a position closer to the front end of the convex portion than a position of 110 mm from the bottom of the concave portion of the fishtail shape toward the front end of the convex portion.
- the distance between the target cutting position and the tip of the fishtail-shaped convex portion is 90 mm or less as shown in FIG. 4B
- the position where the blade of the crop cutting machine actually contacts the sheet bar is the target cutting position.
- the target cutting position is set at a position closer to the bottom of the recess than a position of 90 mm from the tip of the fishtail-shaped protrusion toward the bottom of the recess.
- the target cutting position is a position of 110 mm from the bottom of the concave portion of the fishtail shape toward the tip of the convex portion and a position of 90 mm from the tip of the convex portion toward the bottom of the concave portion. It is preferable to set in between.
- FIG. 5 shows a preferable range of the fishtail-shaped concave bottom and the middle of the convex tip that sets the target cutting position.
- the target cutting position is set as described above, even if the error between the target cutting position and the position where the blade of the crop cutting machine actually contacts the sheet bar is ⁇ 90 mm, the upper limit of the cutting load of the crop cutting machine is not exceeded.
- the cutting can be performed without swinging.
- the shape of the fishtail of the crop portion formed at the front end portion and the rear end portion in the conveying direction of the sheet bar after the rough rolling process is measured by a shape meter provided in front of the crop cutting machine.
- the length from the bottom of the fishtail-shaped recess to the tip of the projection is confirmed by the shape meter. Further, as long as the shape of the fishtail can be determined without using the shape meter, visual observation by an operator or other means may be used.
- Table 1 shows the cutting loads of Nos. 1 to 4). All exceeded 6.47MN, exceeding the fatigue limit load of the crop cutter.
- Table 2 shows the cutting load when cutting is performed aiming at the fishtail-shaped cropped portion (Nos. 5 to 20). No. 1 in which the conditions of the sizing press and the width rolling in the rough rolling process were set so that the length from the bottom of the fishtail-shaped concave portion of the crop portion at the front end of the sheet bar in the conveying direction to the front end of the convex portion was 100 mm. Nos. 5 to 8 and No.
- the fishtail shape is molded so that the shortest length L (mm) from the bottom of the concave portion to the tip of the convex portion satisfies the following formula (1). (2X + 30) ⁇ L ⁇ 300 (1)
- X Maximum error (mm) of the cutting position of the crop cutting machine 0 ⁇ X ⁇ 90
- the shape of the crop portion formed at the rear end portion in the transport direction of the sheet bar is It is preferable to form into a fishtail shape satisfying the expression (1), and to cut the fishtail shape with the intermediate portion between the bottom of the concave portion and the tip of the convex portion as a target cutting position.
- the shape of the fish tail of the crop portion formed at the front and rear end portions of the sheet bar in the conveying direction is the width rolling amount in the width rolling mill, the rolling amount in the horizontal rough rolling mill, and the rough rolling step in the rough rolling step.
- a load exceeding the upper limit of the cutting load of the crop cutting machine may be generated even though the middle portion of the tip of the convex portion is cut.
- the cutting width changes depending on the cutting position. That is, even when an intermediate portion between the fishtail-shaped concave bottom and convex tip is cut, the cutting load varies depending on the cutting position, so the cutting load changes. If the cutting width is long, the cutting load is large, and if the cutting width is short, the cutting load is small.
- a cutting position where the cutting load exceeds the upper limit of the cutting load of the crop cutting machine is defined as a non-cuttable position.
- the uncuttable position is formed between the bottom of the recess and the top of the convex portion slightly beyond the bottom of the fishtail-shaped recess from the steady deformation portion of the seat bar toward the top of the fishtail-shaped projection. It exists also in the middle portion, and is located within a region within 20 mm from the bottom of the fishtail-shaped recess to the tip of the projection.
- the target cutting position of the sheet bar is cut by the crop cutting machine
- the error X depends on the accuracy of sheet bar tracking and is usually 0 to 90 mm.
- the target cutting position is set to a position before (X + 20) from the bottom of the fishtail-shaped recess to the tip of the projection, as shown in FIG.
- the contact position is shifted from the target cutting position by X (mm) toward the bottom of the recess, the blade of the crop cutting machine may come into contact with the uncut position of the fishtail-shaped crop section.
- the target cutting position is set to a position closer to the convex tip than the position of (X + 20) mm from the fishtail-shaped concave bottom toward the convex tip. Further, when the distance between the target cutting position and the tip of the fishtail-shaped convex portion is X (mm) or less as shown in FIG. 6B, the position at which the blade of the crop cutting machine actually contacts the sheet bar. May be missed when X (mm) is deviated from the target cutting position toward the tip of the convex portion.
- the margin for preventing slipping is 5 mm
- the target cutting position is set to a position closer to the bottom of the recess than a position (X + 5) mm from the tip of the fishtail-shaped protrusion toward the bottom of the recess. .
- the target cutting position is a position (X + 20) mm from the bottom of the fishtail-shaped recess toward the tip of the protrusion, and from the tip of the protrusion toward the bottom of the recess (X + 5). ) It is preferable to set between the position of mm.
- FIG. 7 shows a preferable range of the fishtail-shaped concave bottom and the middle of the convex tip that set the target cutting position.
- the target cutting position is set as described above, even when the error between the target cutting position and the position where the blade of the crop cutting machine actually contacts the sheet bar becomes the maximum error X (mm), the cutting of the crop cutting machine is performed. Cutting can be performed without exceeding the load upper limit value and without swinging.
- the width rolling amount and sizing press of the width rolling mill are used.
- the width reduction amount must be changed from the conventional conditions.
- the full width of the sheet bar is cut by using the positions where the front and rear end cropping portions of the sheet bar are cut as the steady deformation portion of the sheet bar. Therefore, the yield was improved by shortening the crop length and reducing the cutting amount.
- the width rolling amount of the width rolling mill and the width reduction amount of the sizing press are the length from the bottom of the fishtail-shaped recess of the crop portion formed at the front end and the rear end of the sheet bar in the conveying direction to the top of the convex. It was set to be shorter.
- the convex part protrudes from the fishtail-shaped concave bottom. It is necessary to increase the length to the tip of the part, and it is necessary to change the conditions of conventional width rolling and sizing press.
- the shape of the leading and rear end portions in the conveying direction of the material to be rolled on the outlet side of the horizontal roughing mill is the rolling reduction ratio due to horizontal rolling at each part in the width direction of the material to be rolled.
- the shape extending in the rolling direction almost in proportion to the width and the falling shape of the width end portion generated by the width expansion by horizontal rolling are combined.
- the shape that extends in the rolling direction approximately in proportion to the rolling reduction by horizontal rolling can be made approximately the shape of the front end portion and the rear end portion of the sheet bar in the conveying direction.
- the length of the fishtail shape of the crop portion formed at the front end portion and the rear end portion of the sheet bar in the conveying direction varies depending on the cumulative amount of horizontal rolling by the horizontal roughing mill, but the present invention is intended. Since the cumulative reduction amount is 55 to 83%, the method described below can absorb the amount of change in fishtail length due to the cumulative reduction amount.
- the width rolling amount of each pass Increase In width rolling, only the width end portion of the material to be rolled (slab) is deformed. Therefore, if the amount of width rolling is increased, only the thickness of the width end portion of the slab before horizontal rolling performed by the horizontal roughing mill is increased. As a result, the length from the bottom of the fishtail-shaped concave portion of the crop portion formed at the front end portion and the rear end portion of the sheet bar in the conveyance direction becomes longer.
- the width rolling is performed so that the difference between the width on the width rolling mill entrance side and the width of the sheet bar after the horizontal rolling is 10 mm or less.
- the fishtail-shaped concave bottom In order to reliably cut the fishtail-shaped concave bottom of the crop part formed at the front end and the rear end of the sheet bar and the middle part of the convex leading end, the fishtail-shaped concave bottom
- the shortest length L (mm) to the tip of the convex part needs to be (2X + 30) mm or more.
- the width rolling amount W R by the width rolling mill and more 30 mm it is preferable that the width rolling amount W R by the width rolling mill and more 30 mm.
- the length of the fish-tail shape for more than 300mm, it is preferable that the width rolling amount W R and 50mm or less.
- width reduction by a sizing press is performed before width rolling by a width mill. Is preferred.
- 150 mm width reduction amount W P It is desirable that the thickness be ⁇ 250 mm.
- the width reduction amount is less than 150 mm, only the width end portion of the slab is deformed by the width reduction and the thickness of the width end portion is increased, so that the horizontal rolling is performed in the subsequent horizontal rough rolling as the width reduction amount increases.
- the length from the bottom of the fishtail-shaped concave portion of the crop portion formed at the front end portion and the rear end portion of the sheet bar in the conveying direction is increased.
- the width reduction amount exceeds 250 mm
- the width reduction causes deformation to the center portion of the slab width, so that the thickness of the center portion of the slab width increases. Since the thickened portion at the center of the slab width is stretched in the rolling direction by horizontal rolling by a horizontal roughing mill after the width reduction press, the fishtail shape of the crop portion formed at the front end portion and the rear end portion in the conveying direction of the sheet bar. The length from the bottom of the recess to the tip of the projection is shortened.
- W P 0.99 ⁇ 250 mm
- increasing the thickness of the width end portion of the slab is generated
- increasing the thickness in the slab width central portion is generated when the width reduction amount W P is equal to or greater than 200 mm.
- the length of the recess bottom of the fishtail shape to projection end becomes long with increasing width reduction amount to a width reduction amount W P is 200mm, the width reduction when the width reduction amount W P is equal to or greater than 200mm Shortens with increasing amount. Therefore, in order to obtain a desired fishtail length width reduction amount W P and 150mm above 250mm or less, it is preferable that the width rolling amount W R less than 40mm or 10 mm.
- the method of controlling the length from the bottom of the fishtail-shaped recess to the tip of the convex portion of the crop portion formed at the front end and rear end of the sheet bar is a method using a width rolling mill.
- a width rolling amount W R and a width reduction rate W P within the limited range described above, until the projection end of the recess bottom of the fishtail shape
- the shortest length L (mm) could be made to be (2X + 30) mm or more and 300 mm or less.
- the shape of the fishtail of the crop portion formed at the front end portion and the rear end portion in the conveying direction of the sheet bar after the rough rolling process is measured by a shape meter provided in front of the crop cutting machine.
- the length from the bottom of the fishtail-shaped recess to the tip of the projection is confirmed by the shape meter. Further, as long as the shape of the fishtail can be determined without using the shape meter, visual observation by an operator or other means may be used.
- Table 3 shows the cutting load when cutting is performed with a crop cutting machine having a maximum cutting position error X of 90 mm aiming at a fishtail-shaped crop (No. 21 to 32).
- No. Nos. 21 to 23 are examples in which only width rolling by a width rolling mill was applied.
- Examples 24 to 32 are examples in which both width reduction by a sizing press and width rolling by a width rolling mill are applied.
- the steel plate cutting position setting device, the steel plate cutting position setting method, and the steel plate manufacturing method of this embodiment are used in, for example, hot rolling equipment exemplified in FIG.
- the hot rolling facility illustrated in FIG. 8 is a hot rolled steel sheet production line, and the steel sheet S is transported from the left to the right in the figure (through plate), except when it is reciprocally rolled by a rolling mill. Is done.
- a steel plate (slab) heated in a heating furnace (not shown) is width-rolled by a width rolling machine 1 and rough-rolled by a rough rolling machine 2.
- the width rolling machine 1 rolls a steel plate in the width direction, that is, in the direction perpendicular to the conveyance direction and in the horizontal direction.
- the rough rolling mill 2 can perform reciprocating rolling, and rolls the steel plate (intermediate material) S to a predetermined plate thickness according to a preset rolling schedule.
- a sizing press can be used instead of the width rolling mill. It is also possible to use a sizing press and a width rolling machine in combination. Moreover, it is also possible to arrange a plurality of rough rolling mills 2 in the steel plate conveying direction to reduce the number of reciprocating rolling operations.
- a finishing mill 3 that performs finish rolling of the steel sheet S is disposed on the downstream side of the rough rolling mill 2 in the direction of conveying the steel sheet.
- a plurality of finish rolling mills 3 are arranged in the steel plate conveying direction, and each finish rolling mill 3 finish-rolls the steel sheet S to a predetermined thickness according to a preset rolling schedule.
- the crop cutting machine 4 of this embodiment is a so-called drum type, but a so-called crank type or vibration type can be used instead.
- the front end portion and the rear end portion in the transport direction of the roughly rolled steel sheet S are rapidly cooled and hardened. If the steel sheet S is passed through the finish mill 3 as it is, A biting failure or the occurrence of drawing of the steel sheet S occurs. Then, the crop part of the steel plate conveyance direction front-end
- a measuring roll 5 is disposed on the upstream side in the steel plate conveyance direction with the crop cutting machine 4 interposed therebetween, and a table roll 6 is disposed on the downstream side in the steel plate conveyance direction.
- a rotation sensor 7 for detecting the rotation state is connected.
- a leading end sensor 8 that detects the leading end portion and the trailing end portion in the conveying direction of the steel sheet S is also disposed.
- the leading edge sensor 8 detects the passing state of the steel sheet S by detecting, for example, gamma rays emitted from a radiation source, and is turned off when the leading end of the conveying direction passes, and turns on when the trailing end of the conveying direction passes, for example.
- a signal is output.
- the leading edge sensor 8 is disposed at the center in the width direction of the steel sheet S.
- the output of the leading edge sensor 8 and the output of the rotation sensor 7 are read into an arithmetic processing device 9 having a high arithmetic processing capability such as a process computer, for example, and the steel sheet S passes through the measuring roll 5, for example.
- the length of the steel plate S at the rear end portion in the steel plate conveyance direction is detected by passing the steel plate S through the front end portion of the steel plate conveyance direction and the table roll 6. Further, the steel plate S is tracked using the output of the rotation sensor 7 from the time when the leading end sensor 8 detects the leading end portion of the steel plate S in the conveying direction.
- the set position of the crop portion at the rear end is cut by the crop cutting machine 4.
- a crop shape meter 10 that detects the shape of the crop portion at the front end portion in the transport direction and the rear end portion in the transport direction of the steel sheet S and a planar temperature that detects the temperature distribution of the crop portion.
- a meter (crop thermometer) 11 is arranged.
- the crop shape meter 10 includes a lower light source 10a that is provided below the conveying line of the steel plate S and emits light upward, and a plurality of cameras 10b that images the shape of the steel plate S above the light source 10a.
- the cropped part projected in the above is imaged by the camera (digital camera) 10b, and the shape of the cropped part is detected from the image.
- the crop shape meter 10 can detect not only the shape of the cropped portion but also the edges at both ends in the width direction of the steel sheet S.
- the flat thermometer 11 is constituted by, for example, a scanning radiation thermometer, a near infrared camera, or the like, and detects the temperature distribution on the upper surface of the crop part, particularly in this embodiment, the temperature distribution in the steel sheet conveyance direction.
- the temperature distribution in the crop portion in the steel plate conveyance direction is obtained, for example, by calculating an average value of the temperature in the width direction of the steel sheet S for each preset length in the steel plate conveyance direction, and arranging the average value in the steel plate conveyance direction and in the crop portion in the steel plate conveyance direction. The temperature distribution.
- the flat surface thermometer 11 can also detect the maximum temperature for each preset length in the steel plate conveyance direction in the crop portion. Then, the output of the crop shape meter 10 and the output of the flat surface thermometer 11 are read into the arithmetic processing device 9, and the cutting position of the crop portion is set according to the arithmetic processing described later.
- Hot-rolled steel sheets for line pipe materials have a larger plate width, larger plate thickness, and lower temperature than general materials, so the cutting load at the front end of the transport direction and the rear end of the transport direction is large, and the existing There is a risk that the upper limit of the cutting load of the crop cutting machine 4 will be exceeded.
- the crop portions formed at the front end portion and the rear end portion in the transport direction of the steel sheet S are roughly classified into a fishtail shape shown in FIG. 9a and a tongue shape shown in FIG. 9b.
- both end portions in the width direction of the steel sheet S protrude in the transport direction from the center portion in the width direction.
- the central portion in the width direction of the steel sheet S protrudes in the transport direction from both end portions in the width direction. Since the cutting load of the crop part by the crop cutting machine 4 is considered to be proportional to the cutting area, in this embodiment, the crop part is formed into a fishtail shape, and the crop part is cut at an intermediate position.
- the steel sheet S is subjected to width rolling or width reduction by the width mill 1 or a sizing press, and the thickness of both ends in the width direction of the steel sheet S is set to the center in the width direction. What is necessary is just to make it larger than the plate
- the intermediate position of the fishtail-shaped crop part indicates between the fishtail-shaped concave bottom and the convex tip.
- FIG. 10 shows, for example, the fishtail shape of the crop part of the hot-rolled steel sheet for line pipe material at the position of the crop cutting machine 4 and the maximum temperature distribution in the steel sheet conveyance direction of the crop part.
- the roughly rolled steel sheet S has a lower temperature at the tip of the convex portion of the fishtail-shaped crop part, and is harder accordingly.
- the maximum temperature is high at the position corresponding to the concave bottom of the fishtail-shaped crop portion, the amount of heat released from the concave bottom itself of the crop portion is also large and hard.
- the cut area at the bottom of the recess of the fishtail-shaped crop part is large, in the hot-rolled steel sheet for line pipe material, a preset length from the bottom of the recess of the crop part to the top of the convex part For example, an area of 20 mm is likely to exceed the upper limit of the cutting load of the crop cutting machine 4, and is inappropriate as a crop cutting position.
- the steel plate cutting position regulation amount set by the specifications of the hot-rolled steel sheet for line pipe material is defined as the crop shape regulation amount.
- the crop cutting position set in the specifications of the existing hot rolled steel sheet production line will be described.
- the error between the target cutting position and the actual cutting position depends on the tracking accuracy of the steel sheet S.
- the tracking accuracy of the steel sheet S is determined by the specifications of the existing hot-rolled steel sheet production line, and the target cutting position is set to the recess bottom of the fishtail-shaped crop portion by the cutting position error due to the tracking accuracy. Unless it is set inside the intermediate position between the tips of the convex portions, it cannot be cut at the intermediate position of the fishtail-shaped cropped portion.
- the cutting position error length due to tracking accuracy that is, a preset steel plate conveyance direction from the tip of the convex portion of the fishtail-shaped crop portion of the hot-rolled steel plate for line pipe material to the bottom of the concave portion.
- a length, for example, a position of 90 mm is set as the convex side cutting position.
- the fishtail-shaped crop portion gradually decreases in cutting area from the bottom of the recess toward the top of the convex portion, so that it can be said that the cutting load also decreases, but gradually increases in temperature from the bottom of the concave portion toward the top of the convex portion. Accordingly, the hardness increases, and as a result, the cutting load increases from the bottom of the recess toward the tip of the projection depending on the temperature. Since the rate of decrease of the cutting load due to the cutting area is larger than the rate of increase of the cutting load due to the temperature from the bottom of the concave portion of the fishtail-shaped crop portion to the tip of the convex portion, the convex portion of the crop portion The cutting load is smaller at the tip.
- the cutting area of the fish tail-shaped crop portion that is, the shape of the crop portion is set.
- the cutting load in the crop portion is calculated, and the position where the cutting load is equal to or lower than the cutting load upper limit value of the crop cutting machine 4 is calculated as the second cutting position.
- the cutting area of the crop part may be determined in detail from the shape of the cutting blade of the crop cutting machine 4, for example, but it may be substituted with an actual cutting width from the bottom of the concave part of the crop part toward the tip of the convex part. In this embodiment, when the crop cutting load is calculated, the cutting width of the crop portion is used.
- the larger one of the fishtail-shaped crop part from the recess bottom is set as the recess-side cutting position.
- the interval between the convex side cutting positions is set as the cutting position of the cropped part.
- the length from the concave bottom to the convex tip is 200 mm or more on the small side from the concave bottom to the convex tip. Desirably, it is 300 mm or less.
- the concave bottom and the convex tip of the fish tail-shaped crop portion Prior to the arithmetic processing performed by the arithmetic processing unit 9 for setting the cutting position of the crop portion of the steel sheet S, the concave bottom and the convex tip of the fish tail-shaped crop portion will be described.
- the two convex portions of the fishtail-shaped crop portion formed at the front end portion in the transport direction and the rear end portion in the transport direction of the steel sheet S are not necessarily equal. Rather, the two convex portions of the fishtail-shaped crop portion are often not equal. In some cases, the cropped portion has a tongue shape. Therefore, as shown in FIG.
- the edges at both ends in the width direction of the steel sheet S are detected from the longitudinal center part of the steel sheet S, that is, the transport direction center part.
- the point V immediately after the number of edges becomes 3 is defined as the bottom of the recess.
- the areas A1 and A2 of the convex portions on both sides of the concave bottom V detected by the crop shape meter 10 are calculated, and the distances L1 and L2 between the tips of the convex portions and the concave bottom are calculated. In this calculation process, when the number of edges does not become three and there is no concave bottom, the ratio of the area A1 of the large area to the area A2 of the small area of the two areas is previously determined.
- the cropped portion has a tongue shape (or fish) It is not a tail shape).
- the tip of the convex portion having a small area is set as the convex portion tip. This is because, when setting the cutting position of the crop part to be described later, if the tip of the convex part having a large area is used as the convex part tip, the convex part having a small area may not be cut.
- step S1 the shape of the crop portion detected by the crop shape meter 10 is read. Include.
- step S2 it is determined whether or not the read shape of the crop part is a fishtail shape. If the shape of the crop part is a fishtail shape, the process proceeds to step S3; In case it returns.
- step S3 the temperature distribution of the crop portion detected by the flat surface thermometer 11 is read.
- step S4 a position of a length in the steel plate conveyance direction (for example, 110 mm) set in advance from the bottom of the concave portion of the fishtail-shaped crop portion to the tip of the convex portion is calculated as the first cutting position.
- step S5 the cutting load distribution in the crop portion is calculated from the read temperature distribution of the crop portion and the shape of the crop portion.
- step S ⁇ b> 6 the position where the cutting load of the crop part is equal to or lower than the cutting load upper limit value of the crop cutting machine 4 in the calculated cutting load distribution in the crop part is calculated as the second cutting position.
- step S7 the process proceeds to step S7, and one of the calculated first cutting position and second cutting position, which has a larger distance from the bottom of the concave portion of the crop portion, is set as the concave side cutting position.
- step S8 the process proceeds to step S8, and the position of the length in the steel plate conveyance direction (for example, 90 mm) set in advance from the front end of the convex part of the fishtail-shaped crop part to the bottom of the concave part is set as the convex part-side cutting position.
- step S9 the portion between the set concave side cutting position and the convex side cutting position is set as the cutting position of the crop part, and then the process returns.
- the cutting load distribution a position where the cutting load of the crop portion is equal to or lower than the cutting load upper limit value of the crop cutting machine 4 is calculated as the second cutting position.
- the calculated one of the first cutting position and the second cutting position which has a larger distance from the fishtail-shaped recess bottom, is set as the recess-side cutting position at which the crop portion can be cut.
- the position of the length in the steel plate conveying direction set in advance from the tip of the fishtail-shaped convex part to the bottom of the concave part is set as the convex part-side cutting position at which the crop part can be cut.
- the part between a crevice side cutting position and a crevice side cutting position is set up as a cutting position of the above-mentioned crop part.
- the width of the convex portion of the crop portion detected by the crop shape meter 10 that is, the cutting width when cut by the crop cutting machine 4
- the crop of the hot rolled steel sheet for line pipe material The first cutting position and the convex-part-side cutting position determined by the shape of the part appear as indicated by the alternate long and short dash line in the figure.
- the temperature distribution of the crop portion detected by the flat thermometer 11 is as shown in FIG. 13b
- the temperature distribution and the shape of the crop portion, that is, the cutting load distribution of the crop portion determined by the cutting width is shown in FIG. It appears as a solid line 13c.
- the second cutting position Since the cutting load of the crop portion is equal to or less than the cutting load upper limit value of the crop cutting machine 4 is the second cutting position, the second cutting position appears as shown by a two-dot chain line in FIG. 13c. Since the second cutting position has a greater distance from the bottom of the recess than the first cutting position, the second cutting position is set to the recess-side cutting position. If the cutting load distribution of the crop part is obtained by taking into consideration only the cutting width of the crop part without considering the temperature distribution of the crop part, it appears as shown by a broken line in FIG. 13c. If the second cutting position is set from the cutting load of the crop part reflecting only the crop part shape, the actual cutting load of the crop part may exceed the upper limit of the cutting load of the crop cutting machine 4.
- the leading edge in the conveying direction And a crop part at the rear end in the conveying direction are made into a fishtail shape, and cutting is performed by the crop cutting machine 4 at each of a cutting position reflecting the temperature distribution and cutting width of the crop part and a cutting position reflecting only the cutting width of the crop part. Went.
- the cutting load of the crop cutting machine 4 at the cutting position by the calculation process of FIG. 12 reflecting the temperature distribution and cutting width of the crop part is indicated by ⁇ in FIG.
- the cutting load of the crop cutting machine 4 is shown as x in FIG. 14 as a comparative example.
- the temperature on the horizontal axis is the temperature on the exit side of the roughing mill 2 at a position 1 m from the front end in the conveying direction as the representative temperature of the intermediate material.
- the cutting load of the crop cutting machine 4 at the cutting position reflecting only the cutting width of the crop part exceeds the cutting load upper limit value of the crop cutting machine 4.
- the cutting load of the crop cutting machine 4 at the cutting position reflecting the temperature distribution and cutting width of the crop part does not exceed the upper limit of the cutting load of the crop cutting machine 4.
- the shape is a fishtail shape
- finish rolling is performed on the crop portion formed at the front end portion or the rear end portion in the transport direction of the steel plate by rough rolling.
- a cutting position of the crop portion is set by the arithmetic processing unit 9 having an arithmetic processing function.
- the shape of the crop portion detected by the crop shape meter 10 is read in the crop portion shape reading step S1
- the temperature distribution of the crop portion detected by the flat surface thermometer 11 is read in the crop portion temperature distribution reading step S3.
- the position of the steel plate conveyance direction length set in advance from the bottom of the fishtail-shaped concave portion to the tip of the convex portion among the read shapes of the crop portion is set as the first cutting position. calculate.
- the cutting load distribution in the steel plate conveyance direction in the crop portion is calculated in the cutting load calculation step S5 from the read temperature distribution of the crop portion and the shape of the crop portion, and the calculated cutting load in the steel plate conveyance direction in the crop portion.
- the position at which the cutting load of the crop portion is equal to or lower than the cutting load upper limit value of the crop cutting machine 4 is calculated in the second cutting position calculation step S6 as the second cutting position.
- one of the calculated first cutting position and second cutting position which has a larger distance from the fishtail-shaped concave bottom, is set in the concave side cutting position setting step S7 as a concave side cutting position where the crop part can be cut.
- the position of the length in the steel plate conveyance direction set in advance from the tip of the fishtail-shaped convex part to the bottom of the concave part is projected as the convex part-side cutting position at which the crop part can be cut.
- This is set in the part side cutting position setting step S8.
- the part between a recessed part side cutting position and a recessed part side cutting position is set by crop part cutting position setting step S9 as a cutting position of a crop part. Therefore, even if the steel plate has a large plate thickness, a large plate width, and a low temperature, the steel plate can be stably cut without significant modification of the equipment such as enhancement of the crop cutting machine 4.
Abstract
Description
仕上圧延前までの粗圧延工程で、鋼板搬送方向先端部と搬送方向後端部のクロップ部の形状を図1(a)に示すようなフィッシュテール形状に作りこむことができる。図2(a)に示すように、従来のクロップ切断位置は鋼板の全幅を切断する位置であったが、図2(b)に示すように、フィッシュテール形状の凹部底と凸部先端の中間部分を切断すれば、鋼板の全幅を切断する場合に比べて切断幅が短くなるために切断荷重が低減する。
更に、目標切断位置と実際にクロップ切断機の刃が鋼板に接触する位置には誤差が生じるので、目標切断位置の設定は、その誤差を鑑みて行わなくてはならない。クロップ切断機の切断位置が目標切断位置からずれた場合でも、切断不能位置に接触することなく、或いは空振りすることなく、クロップ切断機の刃を振り下ろせるような目標切断位置を設定する必要がある。
(1)粗圧延工程と仕上圧延工程を有し、前記粗圧延工程後、前記仕上圧延工程前に鋼板の搬送方向先端部又は搬送方向後端部の何れか一方或いは両方のクロップ部を切断したのち、前記仕上圧延工程で熱延鋼板を製造する方法であって、前記粗圧延工程において、サイジングプレス又は幅圧延機、或いはそれら両方を用いて、前記鋼板の搬送方向先端部及び搬送方向後端部に形成される前記クロップ部の形状をフィッシュテール形状とし、且つ該フィッシュテール形状の凹部底から凸部先端までの長さが200~300mmとなるように成形し、前記凹部底と前記凸部先端の中間部分を目標切断位置として切断することを特徴とする熱延鋼板の製造方法。
[1]粗圧延工程と仕上圧延工程を有し、前記粗圧延工程後、前記仕上圧延工程前に鋼板の搬送方向先端部のクロップ部を切断したのち、前記仕上圧延工程で仕上圧延を施して熱延鋼板を製造する方法であって、前記粗圧延工程において、幅圧延機による幅圧延及び水平粗圧延機による水平圧延によって、前記鋼板の搬送方向先端部に形成される前記クロップ部の形状をフィッシュテール形状とし、且つ該フィッシュテール形状の凹部底から凸部先端までの最短長さL(mm)が下記式(1)を満足するように成形し、前記凹部底と前記凸部先端の中間部分を目標切断位置として切断することを特徴とする熱延鋼板の製造方法。
記
(2X+30) ≦L≦ 300 (1)
ここで、X:クロップ切断機の切断位置の最大誤差(mm)
0 ≦X≦ 90
[3]前記目標切断位置を、前記フィッシュテール形状の前記凹部底から前記凸部先端方向に向かって(X+20)mmの位置と、前記凸部先端から前記凹部底方向に向かって(X+5)mmの位置と、の間に設定することを特徴とする[1]又は[2]に記載の熱延鋼板の製造方法。
[5]前記粗圧延工程において、前記幅圧延機による幅圧延の前にサイジングプレスによる幅圧下を施すことを特徴とする[1]~[3]の何れかに記載の熱延鋼板の製造方法。
[6]前記粗圧延工程において、前記サイジングプレスの幅圧下量WP(mm)を150~250mmとし、且つ前記幅圧延機による幅圧下量WR(mm)を10mm以上40mm未満とすることを特徴とする[5]に記載の熱延鋼板の製造方法。
[7]前記粗圧延工程において、前記サイジングプレスの幅圧下量WP(mm)を150mm未満又は250mm超え400mm以下とし、且つ前記幅圧延機による幅圧延量WR(mm)を30~50mmとすることを特徴とする[5]に記載の熱延鋼板の製造方法。
また、本発明の別の態様によれば、鋼板の搬送方向先端部又は搬送方向後端部のクロップ部の形状をフィッシュテール形状とするためにサイジングプレス又は幅圧延機を用いて幅圧下を行う鋼板製造方法が提供される。
更に、クロップ切断機の刃が鋼板の切断不能位置に接触しないように、また、切断時に空振りすることがないように、目標切断位置を決めたので、常にクロップ切断機の切断荷重上限値を超えずに、また、空振りすることなく、安定してフィッシュテール形状の凹部底と凸部先端の中間部分を切断することが可能となる。
本発明によれば、板厚が大きく、板幅も大きく、且つ温度が低い鋼板であっても、クロップ切断機の能力不足によって切断できないことを未然に防止することができる。また、クロップ切断機の増強などの大きな設備改造を行うことなく、鋼板を安定して切断することができる。
以下、本発明の一実施形態について説明する。
熱延鋼板の製造工程は、スラブから鋼帯を製造する工程であり、工程順に、加熱工程、粗圧延工程、仕上圧延工程、冷却工程、巻取り工程に大別される。以下、加熱工程側を上流側、巻き取り工程側を下流側として説明する。
粗圧延工程では、搬送されてきたスラブに、それぞれ少なくとも一対のロールを具備した幅圧延機と粗圧延機とによって、幅圧延と水平圧延が行われる。幅圧延機は、粗圧延機の上流側と下流側、又は上流側か下流側のどちらか一方に具備されている。幅圧延及び水平圧延は、下流工程側に向けて前進方向に行われる場合と、上流工程側に向けて後進して行われる場合がある。更に粗圧延工程では、幅圧延及び水平圧延が前進のみで行われる場合、又は前進と後進が少なくとも二回以上繰り返される場合がある。粗圧延工程では、以上の操作によって、スラブを所定の板幅、板厚のシートバーにする。
仕上圧延工程では、上下一対のロールを具備した水平圧延機を少なくとも1機以上具備している仕上圧延機を用いて前記シートバーに水平圧延が行われる。このときの水平圧延は一方向で行われる。
冷却工程は、搬送されている仕上圧延後の鋼板に上下から水を噴射して冷却する工程である。
シートバーとは粗圧延工程終了後、仕上圧延前の鋼板のことをいう。シートバーの搬送方向先端部と後端部は、粗圧延工程における水平圧延、幅圧延、サイジングプレスによる幅圧下により、さまざまな形に変形し、クロップ部を形成する。例えば、図1(b)に示すように、板幅端部よりも板幅中央部が圧延方向に長く伸びたタング形状のクロップ部がある。また、図1(a)にしめすような板幅中央部よりも板幅端部が圧延方向に長く伸びたフィッシュテール形状のクロップ部がある。更に、左右で非対称の場合もあり、図1(c)に示すような左右非対称なタング形状、図1(d)に示すような左右非対称なフィッシュテール形状もある。
幅圧延機による幅圧延、及び、サイジングプレスによる幅圧下は、粗圧延による水平圧延の前に板幅端部に変形を与える加工である。そのため、シートバーの搬送方向先端部及び後端部をフィッシュテール形状にするためには、粗圧延工程に幅圧延機が少なくとも一機、或いはサイジングプレスが少なくとも一機、或いは幅圧延機とサイジングプレスの両方が夫々少なくとも一機以上設置されている必要がある。
クロップ切断機に加わる切断荷重は、切断時にクロップ切断機の刃が接触する部分の板厚の影響を受ける。この板厚を切断厚と呼ぶ。一般的に、シートバーの板厚は圧延方向で一定であるために、切断厚はシートバーの定常部の板厚と等しいものと考えてよい。実際の操業においては、クロップ切断機の刃が接触する部分の板厚或いは定常部の板厚を厳密に測定することは困難であるので、測定機器により測定したシートバーの板厚、或いは粗圧延のスケジュールにより設定されているシートバーの板厚を切断厚としてよい。切断厚が50mm以上のシートバーの場合は、該シートバーに形成されているクロップ部のフィッシュテール形状の凹部底と凸部先端の中間部分を切断することで切断荷重を低減させる。ここで、中間部分とは、フィッシュテール形状の凹部底と凸部先端の間の領域にある位置の部分のことをいう。
また、クロップ切断機でシートバーの切断を行う場合、目標切断位置と実際に切断機の刃が接触する位置との間には誤差が生じ、その誤差は、鋼板のトラッキングの精度に依存しており最大で±90mmである。そこで、シートバーに形成されているクロップ部のフィッシュテール形状の凹部底と凸部先端の中間部分を確実に切断するため、前記フィッシュテール形状の凹部底から凸部先端までの長さを200mm以上とし、製品歩留まりの観点から、前記長さの上限を300mmとする。
シートバーの搬送方向先端部及び後端部に形成されたフィッシュテール形状のクロップ部を切断する場合、該シートバーの板幅、板厚、切断温度によっては、前記フィッシュテール形状の凹部底と凸部先端の中間部分を切断したにも関わらずクロップ切断機の切断荷重上限値を超える荷重が発生する場合がある。図2を見れば分かるように、フィッシュテール形状のクロップ部を切断する場合、切断位置によって切断幅が変化する。つまり、フィッシュテール形状の凹部底と凸部先端の中間部分を切断した場合でも、切断位置によって切断幅が異なるので切断荷重が変化する。切断幅が長ければ切断荷重は大きく、切断幅が短ければ切断荷重は小さいので、フィッシュテール形状の凹部底に近いほど切断荷重が大きくなる。つまり、切断位置によっては、フィッシュテール形状の凹部底と凸部先端の中間部分を切断しているにも関わらず、切断荷重がクロップ切断機の切断荷重上限値を超える切断位置が存在する場合がある。切断荷重がクロップ切断機の切断荷重上限値を超える切断位置を切断不能位置と定義する。切断不能位置は、図3に示すように、シートバーの定常変形部からクロップ部のフィッシュテール形状の凸部先端に向かって該フィッシュテール形状の凹部底を若干越えた凹部底と凸部先端の中間部分にも存在しており、前記フィッシュテール形状の凹部底から凸部先端に向けて20mm以内の領域内の位置となっている。
また、目標切断位置とフィッシュテール形状の凸部先端との距離が図4(b)に示すように90mm以下だった場合は、実際にクロップ切断機の刃がシートバーに接触する位置が目標切断位置から前記凸部先端側に90mmずれたときに、空振りしてしまう可能性がある。このため、目標切断位置は、前記フィッシュテール形状の凸部先端から凹部底方向に向かって90mmの位置より凹部底側の位置に設定されることが好ましい。
粗圧延工程後のシートバーの搬送方向先端部と後端部に形成されたクロップ部のフィッシュテールの形状は、クロップ切断機前に具備された形状計によって測定する。前記フィッシュテール形状の凹部底から凸部先端までの長さは前記形状計によって確認を行う。
また、上記の形状計によらずともフィッシュテールの形状が判断可能であれば、オペレータによる目視や或いはその他の手段を用いてもよい。
クロップ切断機でシートバーの切断を行う場合、目標切断位置と実際にクロップ切断機の刃が接触する位置との間には誤差が生じ、その最大誤差X(mm)は、鋼板のトラッキングの精度に依存しており、通常0~90mmである。そこで、シートバーの搬送方向先端部に形成されているクロップ部のフィッシュテール形状の凹部底と凸部先端の中間部分を確実に切断するため、前記フィッシュテール形状の凹部底から凸部先端までの最短長さL(mm)を(2X+30)mm以上とし、製品歩留まりの観点から、前記最短長さLの上限を300mmとする。即ち、前記フィッシュテール形状の凹部底から凸部先端までの最短長さL(mm)が下記式(1)を満足するように成形する。
記
(2X+30) ≦L≦ 300 (1)
ここで、X:クロップ切断機の切断位置の最大誤差(mm)
0 ≦X≦ 90
更に、前記シートバーの搬送方向先端部のクロップ部に加えて搬送方向後端部のクロップ部も切断する場合には、前記シートバーの搬送方向後端部に形成されるクロップ部の形状を前記式(1)を満足するフィッシュテール形状に成形し、該フィッシュテール形状の凹部底と凸部先端の中間部分を目標切断位置として切断することが好ましい。
シートバーの搬送方向先端部及び後端部に形成されるクロップ部のフィッシュテールの形状は、粗圧延工程において、幅圧延機での幅圧延量、水平粗圧延機での圧延量、粗圧延工程におけるパス数、サイジングプレスによる幅圧下量を制御することで所望の形状とすることができる。
また、目標切断位置とフィッシュテール形状の凸部先端との距離が図6(b)に示すようにX(mm)以下だった場合は、実際にクロップ切断機の刃がシートバーに接触する位置が目標切断位置から前記凸部先端側にX(mm)ずれたときに、空振りしてしまう可能性がある。このため、空振り防止のマージンを5mmとし、目標切断位置は、前記フィッシュテール形状の凸部先端から凹部底方向に向かって(X+5)mmの位置より凹部底側の位置に設定されることが好ましい。
また、前記フィッシュテール形状の凹部底から凸部先端までの最短長さLを(2X+30)mm以上300mm以下にするためには、幅圧延機による幅圧延の前にサイジングプレスによる幅圧下を施すことが好ましい。
一方、幅圧下量WPを150mm未満(0mmを含まない)又は250mm超え400mm以下としたときは、幅圧下プレス後の水平粗圧延機による水平圧延によって形成されるフィッシュテール形状の凹部底から凸部先端までの長さが短くなるため、幅圧下を施さない場合と同様、幅圧延量WRを30~50mmとすることが好ましい。
粗圧延工程後のシートバーの搬送方向先端部及び後端部に形成されたクロップ部のフィッシュテールの形状は、クロップ切断機前に具備された形状計によって測定する。前記フィッシュテール形状の凹部底から凸部先端までの長さは前記形状計によって確認を行う。
また、上記の形状計によらずともフィッシュテールの形状が判断可能であれば、オペレータによる目視や或いはその他の手段を用いてもよい。
また、本発明例では、仕上圧延時の通板のトラブルである蛇行、噛み込み不良、絞り、反りは発生せず、本発明によるクロップ部の切断方法で仕上圧延機への通板を安定化できることを確認した。
次にステップS2に移行して、読込まれたクロップ部の形状がフィッシュテール形状であるか否かを判定し、クロップ部の形状がフィッシュテール形状である場合にはステップS3に移行し、そうでない場合には復帰する。
次にステップS4に移行して、フィッシュテール形状のクロップ部の凹部底から凸部先端に向けて予め設定された鋼板搬送方向長さ(例えば110mm)の位置を第1切断位置として算出する。
次にステップS5に移行して、読込まれたクロップ部の温度分布及びクロップ部の形状からクロップ部内の切断荷重分布を算出する。
次にステップS6に移行して、算出されたクロップ部内の切断荷重分布のうち、クロップ部の切断荷重がクロップ切断機4の切断荷重上限値以下となる位置を第2切断位置として算出する。
次にステップS8に移行して、フィッシュテール形状のクロップ部の凸部先端から凹部底に向けて予め設定された鋼板搬送方向長さ(例えば90mm)の位置を凸部側切断位置に設定する。
次にステップS9に移行して、設定された凹部側切断位置と凸部側切断位置の間の部分をクロップ部の切断位置として設定してから復帰する。
B 凸部先端
C 目標切断位置
D 切断不能位置の領域
E 目標切断位置の設定範囲
1 幅圧延機
2 粗圧延機
3 仕上圧延機
4 クロップ切断機
5 メジャーリングロール
6 テーブルロール
7 回転センサ
8 先尾端センサ
9 演算処理装置
10 クロップ形状計
11 平面温度計(クロップ温度計)
S 鋼板
Claims (16)
- 粗圧延工程と仕上圧延工程を有し、前記粗圧延工程後、前記仕上圧延工程前に鋼板の搬送方向先端部又は後端部の何れか一方或いは両方のクロップ部を切断したのち、前記仕上圧延工程で熱延鋼板を製造する方法であって、前記粗圧延工程において、サイジングプレス又は幅圧延機、或いはそれら両方を用いて、前記鋼板の搬送方向先端部及び後端部に形成される前記クロップ部の形状をフィッシュテール形状とし、且つ該フィッシュテール形状の凹部底から凸部先端までの長さが200~300mmとなるように成形し、前記凹部底と前記凸部先端の中間部分を目標切断位置として切断することを特徴とする熱延鋼板の製造方法。
- 前記目標切断位置を、前記フィッシュテール形状の前記凹部底から前記凸部先端方向に向かって110mmの位置と前記凸部先端から前記凹部底方向に向かって90mmの位置との間に設定することを特徴とする請求項1に記載の熱延鋼板の製造方法。
- 粗圧延工程と仕上圧延工程を有し、前記粗圧延工程後、前記仕上圧延工程前に鋼板の搬送方向先端部のクロップ部をクロップ切断機で切断したのち、前記仕上圧延工程で仕上圧延を施して熱延鋼板を製造する方法であって、前記粗圧延工程において、幅圧延機による幅圧延及び水平粗圧延機による水平圧延によって、前記鋼板の搬送方向先端部に形成される前記クロップ部の形状をフィッシュテール形状とし、且つ該フィッシュテール形状の凹部底から凸部先端までの最短長さL(mm)が下記式(1)を満足するように成形し、前記凹部底と前記凸部先端の中間部分を目標切断位置として切断することを特徴とする熱延鋼板の製造方法。
記
(2X+30) ≦L≦ 300 (1)
ここで、X:クロップ切断機の切断位置の最大誤差(mm)
0 ≦X≦ 90 - 前記粗圧延工程において、前記鋼板の搬送方向先端部に形成される前記クロップ部に加えて前記鋼板の搬送方向後端部に形成されるクロップ部の形状を前記式(1)を満足するフィッシュテール形状に成形し、該フィッシュテール形状の凹部底と凸部先端の中間部分を目標切断位置として切断することを特徴とする請求項3に記載の熱延鋼板の製造方法。
- 前記目標切断位置を、前記フィッシュテール形状の前記凹部底から前記凸部先端方向に向かって(X+20)mmの位置と、前記凸部先端から前記凹部底方向に向かって(X+5)mmの位置と、の間に設定することを特徴とする請求項3又は4に記載の熱延鋼板の製造方法。
- 前記粗圧延工程において、前記幅圧延機による幅圧延量WR(mm)を30~50mmとすることを特徴とする請求項3~5の何れか一項に記載の熱延鋼板の製造方法。
- 前記粗圧延工程において、前記幅圧延機による幅圧延の前にサイジングプレスによる幅圧下を施すことを特徴とする請求項3~6の何れか一項に記載の熱延鋼板の製造方法。
- 前記粗圧延工程において、前記サイジングプレスの幅圧下量WP(mm)を150~250mmとし、且つ前記幅圧延機による幅圧下量WR(mm)を10mm以上40mm未満とすることを特徴とする請求項7に記載の熱延鋼板の製造方法。
- 前記粗圧延工程において、前記サイジングプレスの幅圧下量WP(mm)を150mm未満又は250mm超え400mm以下とし、且つ前記幅圧延機による幅圧延量WR(mm)を30~50mmとすることを特徴とする請求項7に記載の熱延鋼板の製造方法。
- 形状がフィッシュテール形状であり且つ粗圧延によって鋼板の搬送方向先端部又は搬送方向後端部に形成されたクロップ部を仕上圧延の前にクロップ切断機で切断する場合に、演算処理機能を有する演算処理装置で、そのクロップ部の切断位置を設定する鋼板切断位置設定装置であって、
クロップ形状計で検出されたクロップ部の形状を読込むクロップ部形状読込み部と、
クロップ温度計で検出されたクロップ部の温度分布を読込むクロップ部温度分布読込み部と、
前記読込まれたクロップ部の形状のうち、前記フィッシュテール形状の凹部底から凸部先端に向けて予め設定された鋼板搬送方向長さの位置を第1切断位置として算出する第1切断位置算出部と、
前記読込まれたクロップ部の温度分布から前記クロップ部内の鋼板搬送方向への切断荷重分布を算出する切断荷重分布算出部と、
前記算出されたクロップ部内の鋼板搬送方向への切断荷重分布のうち、前記クロップ部の切断荷重が前記クロップ切断機の切断荷重上限値以下となる位置を第2切断位置として算出する第2切断位置算出部と、
前記算出された第1切断位置と前記算出された第2切断位置の何れか前記フィッシュテール形状の凹部底からの距離の大きい方を前記クロップ部の切断可能な凹部側切断位置として設定する凹部側切断位置設定部と
を備えたことを特徴とする鋼板切断位置設定装置。 - 前記読込まれたクロップ部の形状のうち、前記フィッシュテール形状の凸部先端から凹部底に向けて予め設定された鋼板搬送方向長さの位置を前記クロップ部の切断可能な凸部側切断位置として設定する凸部側切断位置設定部と、
前記凹部側切断位置と前記凹部側切断位置との間の部分を前記クロップ部の切断位置として設定するクロップ部切断位置設定部と
を備えたことを特徴とする請求項10に記載の鋼板切断位置設定装置。 - 前記切断荷重算出部は、前記読込まれたクロップ部の形状を用いて前記クロップ部内の鋼板搬送方向への切断荷重分布を算出することを特徴とする請求項10又は11に記載の鋼板切断位置設定装置。
- 前記請求項10乃至12の何れか一項に記載の鋼板切断位置設定装置で設定されたクロップ部の切断位置に応じ、鋼板の搬送方向先端部又は搬送方向後端部のクロップ部をクロップ切断機で切断することを特徴とする鋼板製造方法。
- 形状がフィッシュテール形状であり且つ粗圧延によって鋼板の搬送方向先端部又は搬送方向後端部に形成されたクロップ部を仕上げ圧延の前にクロップ切断機で切断する場合に、演算処理機能を有する演算処理装置で、そのクロップ部の切断位置を設定する鋼板切断位置設定方法であって、
クロップ形状計で検出されたクロップ部の形状を読込むクロップ部形状読込みステップと、
クロップ温度計で検出されたクロップ部の温度分布を読込むクロップ部温度分布読込みステップと、
前記読込まれたクロップ部の形状のうち、前記フィッシュテール形状の凹部底から凸部先端に向けて予め設定された鋼板搬送方向長さの位置を第1切断位置として算出する第1切断位置算出ステップと、
前記読込まれたクロップ部の温度分布から前記クロップ部内の鋼板搬送方向への切断荷重分布を算出する切断荷重分布算出ステップと、
前記算出されたクロップ部内の鋼板搬送方向への切断荷重分布のうち、前記クロップ部の切断荷重が前記クロップ切断機の切断荷重上限値以下となる位置を第2切断位置として算出する第2切断位置算出ステップと、
前記算出された第1切断位置と前記算出された第2切断位置の何れか前記フィッシュテール形状の凹部底からの距離の大きい方を前記クロップ部の切断可能な凹部側切断位置として設定する凹部側切断位置設定ステップと、
前記読込まれたクロップ部の形状のうち、前記フィッシュテール形状の凸部先端から凹部底に向けて予め設定された鋼板搬送方向長さの位置を前記クロップ部の切断可能な凸部側切断位置として設定する凸部側切断位置設定ステップと、
前記凹部側切断位置と前記凹部側切断位置との間の部分を前記クロップ部の切断位置として設定するクロップ部切断位置設定ステップと
を備えたことを特徴とする鋼板切断位置設定方法。 - 前記切断荷重算出ステップは、前記読込まれたクロップ部の形状を用いて前記クロップ部内の鋼板搬送方向への切断荷重分布を算出することを特徴とする請求項14に記載の鋼板切断位置設定方法。
- 前記請求項14又は15に記載の鋼板切断位置設定方法で前記鋼板の搬送方向先端部又は搬送方向後端部のクロップ部の形状をフィッシュテール形状とするためにサイジングプレス又は幅圧延機を用いて幅圧下を行うことを特徴とする鋼板製造方法。
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