JP4192013B2 - Manufacturing method of steel plate for striping in hot rolling line - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a steel plate for striping in a hot rolling line. To the law In particular, it is suitable for use in controlling the temperature of the steel sheet for striping that is stripped into a plurality of strips so as to be within a predetermined range.
[0002]
[Prior art]
In the field of steel industry, it is a common practice to produce a steel sheet by passing a roughly rolled sheet bar through a rolling stand.
When manufacturing a steel plate in this way, both ends of the sheet bar are heated with an edge heating device, and then the sheet bar is passed through a rolling stand to improve the quality of the steel plate. (For example, see Patent Document 1).
[0003]
By the way, in recent years, in order to improve the productivity of a steel sheet, it has begun to manufacture a steel sheet having a width that is a multiple of the product width, and to strip the manufactured steel sheet into a plurality of strips.
[0004]
[Patent Document 1]
JP 2000-160289 A
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional technology, since both ends of the sheet bar are heated and then the sheet bar is passed through a rolling stand to produce a steel plate, the temperature of both ends of the manufactured steel plate is reduced. However, there was a risk that the temperature would be higher than the central temperature.
[0006]
Therefore, for example, when the steel plate produced by rolling using the above-described conventional technique is divided (slit) at the central portion to form two strips, and two steel plates are formed, Since the temperature difference at both ends of the steel plate becomes large, there is a possibility that the quality at both ends of each steel plate cannot be made uniform.
[0007]
As described above, when a steel sheet rolled and manufactured using the above-described conventional technique is prepared, there is a problem that it is difficult to improve the quality of each of the prepared steel sheets.
[0008]
The present invention has been made in view of the above-described problems, and an object of the present invention is to improve the quality of each steel sheet manufactured by stripping as much as possible.
[0009]
[Means for Solving the Problems]
In the manufacturing method of the steel plate for preparation in the hot rolling line of the present invention, the roughly rolled sheet bar is passed through the first to n-th rolling stands, and is prepared into a plurality of strips in a predetermined subsequent process. A method of manufacturing a steel plate for a rolling in a hot rolling line for manufacturing a steel plate for a winding, wherein the temperature distribution in the width direction of the steel plate for a winding at a predetermined position behind the n-th rolling stand Temperature control for controlling the temperature of both end portions in the width direction of the steel plate for stripping to be substantially the same as the temperature of the stripped portion stripped by the plurality of strips. Process The And, in the temperature control step, a difference between the temperature at both ends in the width direction of the rough-rolled sheet bar and the temperature of the stripped portion that is stripped into the plurality of strips is within a predetermined temperature range. So as to control the temperature of the coarsely rolled sheet bar using a coarse bar heating device It is characterized by that.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, with reference to the drawings, a method for producing a steel plate for striping in the hot rolling line of the present invention Legal An embodiment will be described.
[0015]
In the present embodiment, a steel sheet for stripping having a width of 1220 [mm] is manufactured, and the striped steel sheet for manufacturing described above is slit at the center portion to form two strips, and the product width is 600 [mm]. The case where two steel plates having a thickness of 2 [mm] are formed will be described as an example.
[0016]
FIG. 1 shows an embodiment of the present invention and is a diagram showing an example of a schematic configuration of a hot rolling facility.
[0017]
In FIG. 1, a hot rolling facility 1 has a hot rolling line 2 and a slitter line 3.
The hot rolling line 2 is a line for rolling the strip steel plate, and includes a heating furnace 4, a rough rolling machine 5, a coil box 6, a joining machine 7, a heating device 8, and finish rolling. Side thermometer 9, finish rolling mill 10, finish rolling exit thermometer 11, runout table 12, steel plate shear 13, pre-winding thermometer 14, coil winding device 15, and transport roller speed control A device 16 and a temperature control device 17 are included.
[0018]
The heating furnace 4 is for heating the slab 18 conveyed from the rolled steel plate production line which is not illustrated to predetermined temperature.
The rough rolling machine 5 is for roughly rolling the slab 18 heated by the heating furnace 4 to form a sheet bar 19.
[0019]
The coil box 6 is for winding the sheet bar 19 formed by the rough rolling mill 5 once and then rewinding it and supplying it to the joining machine 7.
The joining machine 7 is for joining the leading end of the sheet bar 19 conveyed from the coil box 6 and the trailing end of the preceding sheet bar 19.
[0020]
The heating device 8 is for heating the sheet bar 19 conveyed from the bonding machine 7, and includes a coarse bar heating device 8 a and an edge heating device 8 b for heating both ends of the sheet bar 19. . The specific configuration and function of the coarse bar heating device 8a will be described later.
[0021]
The finish rolling entering thermometer 9 is for measuring the temperature in the width direction of the sheet bar 19 immediately before being conveyed to the heating device 8.
[0022]
The finish rolling mill 10 is for continuously finishing and rolling the sheet bar 19 by, for example, seven rolling stands F1 to F7 to form the strip steel plate 20. In addition, each rolling stand F1-F7 is comprised by the work roll, the backup roll, the load cell, the motor, etc.
[0023]
The finish rolling delivery thermometer 11 is for measuring the temperature in the width direction of the strip steel plate 20 finish-rolled by the finish rolling mill 10. In the present embodiment, the temperature in the width direction of the strip steel plate 20 measured by the finish rolling delivery thermometer 11 is set to about 850 [° C.] to 900 [° C.].
[0024]
The run-out table 12 has a cooling stand for cooling the strip steel plate 20 that has been finish-rolled by the finish rolling mill 10.
The coil winding device 15 is for winding the strip steel plate 20 cooled by the runout table 12 in a coil shape.
[0025]
The steel plate shear 13 is used to cut the strip steel plate 20 when the strip steel plate 20 is wound by a coil winding device 15 by a predetermined length. The pre-winding thermometer 14 is for measuring the temperature in the width direction of the winding steel plate 20 wound around the coil winding device 15.
In the present embodiment, the winding temperature of the strip steel plate 20 measured by the pre-winding thermometer 14 is set to about 550 [° C.].
Further, in the present embodiment, the pre-winding thermometer 14 is arranged in front of the steel plate shear 13, but the pre-winding thermometer 14 and the steel plate shear 13 only have to be arranged in the line. For example, the steel plate shear 13 may be disposed in front of the pre-winding thermometer 14.
[0026]
The conveyance roller speed control device 16 controls the conveyance speed of the sheet bar 19 and the strip steel plate 20 by adjusting the rotation speed of the plurality of conveyance rollers disposed in the hot rolling line 2. Is.
[0027]
The transport roller speed control device 16 according to the present embodiment is configured so that the maximum value of the finish rolling speed in the finish rolling mill 10 is a predetermined speed within a range of 1200 [mpm] to 1500 [mpm]. The rotational speed of the plurality of transport rollers is adjusted.
[0028]
Moreover, when performing such high-speed finish rolling, it is preferable to arrange | position a cooling spray between each rolling stand F1-F7, and to finish-roll while cooling with the arranged cooling spray. .
[0029]
The temperature control device 17 monitors the temperature in the width direction of the sheet bar 19 measured by the finish rolling entry thermometer 9, and at both ends of the strip steel plate 20 measured by the finish rolling exit thermometer 11. This is for controlling the heating device 8 so that the temperature and the temperature at the take-up portion substantially coincide. The main part of the temperature control device 17 is constituted by a computer.
[0030]
Here, the both ends of the steel plate 20 for a preparation refer to the predetermined area | region in the right end part of the steel plate 20 for a preparation, and the predetermined area | region in a left end part. Moreover, the preparation part of the preparation steel plate 20 means the predetermined area | region of the preparation steel plate 20 prepared by the slitter line 3 mentioned later.
[0031]
In this embodiment, since two strips of the stripping steel plate 20 are stripped, the temperature at both ends of the stripping steel plate 20 measured by the finish rolling delivery thermometer 11 and the temperature at the central portion are approximately. The heating operation of the heating device 8 is controlled so as to match.
[0032]
In addition, the inventors of the present application will make the strip if the difference between the temperature at both ends of the strip steel plate 20 measured by the finish rolling thermometer 11 and the temperature at the strip is 20 [° C.] or less. It has been found that a steel plate formed by stripping the take-up steel plate 20 can obtain substantially the same quality as the case where a steel plate having the same width as the formed steel plate is formed without scraping.
[0033]
Therefore, in the present embodiment, the temperature of the central portion of the strip steel plate 20 measured by the finish rolling delivery thermometer 11 is 870 [° C.], and the temperatures at both ends are 890 [° C.]. It was made to become.
[0034]
The slitter line 3 is a line for forming two steel sheets by winding two steel sheets 20 for finishing that have been rolled by the hot rolling line 2 described above, and includes a coil unwinding device 21 and a leveler 22. And a slitter 23 and a winding coil take-up device 24.
[0035]
The coil rewinding device 21 is for rewinding and supplying the leveling steel plate 20 wound in a coil shape by the coil winding device 15 to the leveler 22.
[0036]
The leveler 22 is a device for correcting the shape of the strip steel plate 20 rewound by the coil rewinding device 21 to make it flat.
The slitter 23 is for cutting the strip-shaped steel plate 20 whose shape has been corrected by the leveler 22 at the central portion in the width direction to cut two strips (see FIG. 2).
[0037]
The winding coil winding device 24 is for winding each of the two steel plates 20a and 20b wound by the slitter 23 into a coil shape (see FIG. 2). As shown in FIG. 2, in the present embodiment, both ends of the cut steel plate 20 are cut by cutting the central portion of the steel plate 20 for cutting and cutting both ends at the same time. Is made into an ear dust 20c having a width of about 10 mm, and the characteristics of the steel plates 20a and 20b are made as uniform as possible. Further, the two steel plates 20a and 20b wound in a coil shape in this way are mainly used as automobiles, containers, building materials, or cut plates, respectively.
[0038]
Next, the configuration and function of the coarse bar heating device 8a disposed in the heating device 8 will be described.
FIG. 3 is a view showing a state of the hot rolling line 2 in which a region where the coarse bar heating device 8a is disposed is enlarged. Fig.3 (a) is the figure which looked at the area | region where the coarse bar heating apparatus 8a is arrange | positioned from the side. FIG.3 (b) is the figure which looked at the area | region where the coarse bar heating apparatus 8a is arrange | positioned from upper direction.
[0039]
In FIG. 3, the coarse bar heating device 8 a according to the present embodiment heats the first transverse induction heating device 31 that heats the right end portion of the seat bar 19 and the center portion (striping portion) of the seat bar 19. And a third transverse induction heating device 33 for heating the left end portion of the seat bar 19.
[0040]
These first to third transverse type induction heating devices 31 to 33 can be shifted in the width direction of the seat bar 19, respectively, and can heat a desired region of the seat bar 19. Yes.
[0041]
Here, the transverse induction heating apparatus will be described with reference to FIG. Since the first to third transverse induction heating devices 31 to 33 have the same configuration, only the first transverse induction heating device 31 will be described with reference to FIG.
[0042]
In FIG. 4, the first transverse induction heating device 31 has an upper iron core 31a, an upper coil 31b, a lower iron core 31c, and a lower coil 31d.
[0043]
As shown in FIG. 4, the upper iron core 31 a around which the upper coil 31 b is wound and the lower iron core 31 c around which the lower coil 31 d is wound are arranged so as to face each other at the right end portion of the seat bar 19. Thus, the first transverse induction heating device 31 is configured.
[0044]
And by flowing a predetermined current through the upper coil 31b and the lower coil 31d, a magnetic field is generated in the plate thickness direction of the sheet bar 19 conveyed between the upper iron core 31a and the lower iron core 31c, and The right end portion of the seat bar 19 is heated by the action of the generated magnetic field.
[0045]
The amount of heating at the right end of the seat bar 19 is controlled by the distance between the upper iron core 31a and the lower iron core 31c, the value of the current passed through the upper coil 31b and the lower coil 31d, and the like.
[0046]
Next, the configuration of the temperature control device 17 will be described.
FIG. 5 is a block diagram showing an example of the configuration of the temperature control device 17.
In FIG. 5, the temperature control device 17 includes a finish rolling entry temperature monitoring unit 51, a heating profile storage unit 52, a profile acquisition unit 53, an energization amount setting unit 54, a shift amount setting unit 55, and a heating device control. And a command unit 56.
[0047]
The finish rolling entry side temperature monitoring unit 51 is for monitoring the temperature distribution in the width direction of the sheet bar 19 measured by the finish rolling entry side thermometer 9.
[0048]
The heating profile storage unit 52 is for storing a profile of temperature distribution in the width direction of the sheet bar 19. The heating profile storage unit 52 stores information on the heating amount and position of the first to third transverse induction heating devices 31 to 33 in association with the temperature distribution profile.
[0049]
The inventors of the present application produce a wide steel sheet for preparation by making the temperature at the preparation part (center part) of the sheet bar measured by the finish rolling entry thermometer 9 and the temperature at both ends the same. It has been found that the temperature at the preparation part (center part) of the steel sheet for preparation measured by the finish rolling temperature thermometer 11 tends to be lower than the temperature at both end parts.
[0050]
This is considered due to the following causes.
That is, since the heating furnace 4 heats the slab 18 in a high-temperature atmosphere, the temperature of the central portion of the slab 18 is inevitably low, and the temperature distribution of the slab 18 heated in the heating furnace 4 is reduced by rolling. Thus, even if the plate thickness is reduced, it is maintained. Therefore, the temperature in the width direction of the strip steel plate 20 tends to be low at the center and high at both ends. When manufacturing a narrow steel plate, the difference between the temperature at the center of the slab and the temperature at both ends is small. On the other hand, when manufacturing the wide sheet steel 20 for a preparation like this Embodiment, the difference of the temperature of the center part of the slab 18 and the temperature of both ends is large compared with a narrow slab. Become a trend.
[0051]
Therefore, in the present embodiment, by performing finish rolling in a state where the temperature at the center portion of the sheet bar 19 measured by the finish rolling entry thermometer 9 is higher than the temperatures at both end portions (FIG. 6A). The temperature at the central portion of the steel plate 20 for winding measured by the finish rolling temperature thermometer 11 is made substantially the same as the temperature at both end portions (see FIG. 6B). .
[0052]
That is, in the present embodiment, the heating amount of the second transverse induction heating device 32 that heats the central portion of the seat bar 19 is made larger than the heating amount of the other transverse induction heating devices 31 and 33. I am doing so.
[0053]
The profile acquisition unit 53 calculates the difference between the current temperature distribution in the width direction of the sheet bar 19 monitored by the finish rolling entry side temperature monitoring unit 51 and a preset target temperature distribution.
[0054]
Then, a temperature distribution profile corresponding to the calculated temperature distribution difference is acquired from the heating profile storage unit 52. At this time, information on the heating amounts and positions of the first to third transverse induction heating devices 31 to 33 stored in association with the acquired profile of the temperature distribution is also acquired.
[0055]
The energization amount setting unit 54 is based on information on the heating amounts of the first to third transverse induction heating devices 31 to 33 acquired by the profile acquisition unit 53, and is based on the first to third transverse induction heating. The value of the electric current sent through the coil (upper coil 31b, lower coil 31d) arrange | positioned at the apparatuses 31-33 is set.
[0056]
The shift amount setting unit 55 is based on information about the positions of the first to third transverse induction heating devices 31 to 33 acquired by the profile acquisition unit 53, and is based on the first to third transverse induction heating devices. A shift amount of 31 to 33 is set.
[0057]
The heating device control command unit 56 causes the current of the value set by the energization amount setting unit 54 to flow through the coils disposed in the first to third transverse induction heating devices 31 to 33. The control device generates a control command signal for shifting the first to third transverse induction heating devices 31 to 33 in the width direction of the seat bar 19 by the shift amount set by the shift amount setting unit 55. 8 to send.
[0058]
Then, the heating device 8 heats the seat bar 19 by controlling the first to third transverse induction heating devices 31 to 33 based on the control command signal transmitted from the heating device control command unit 56.
[0059]
Further, as shown in FIG. 7, the inventors of the present application measured with a finish rolling exit thermometer 11 of the steel plate 20 for finishing manufactured by heating the sheet bar 19 and then finish rolling. It was noted that there is a correlation between the temperature to be applied and the yield point of the strip steel plate 20.
[0060]
As a result of various analyzes, the difference between the yield point at the central portion of the steel plate 20 for scraping and the yield point at both ends is 30 [MPa] (= 3 [kgf / mm]. ² It has been found that two steel plates 20a and 20b formed by taking up two strips of the strip steel plate 20 are good if the pressure is set to 12 MPa or less.
[0061]
That is, in the present embodiment, by managing the temperature of the steel plate 20 for preparation measured by the finish rolling thermometer 11 and the yield point of the steel plate 20 for preparation, two steel plates 20 for preparation are prepared. Various problems are not caused in the two steel plates 20a and 20b formed by cutting, so that it is possible to reliably prevent the production (shape) of the steel plate from being shipped.
[0062]
Next, an example of the processing operation of the temperature control device 17 will be described with reference to the flowchart of FIG.
First, in the first step S <b> 1, the profile acquisition unit 53 acquires the current temperature distribution in the width direction of the sheet bar 19 measured by the finish rolling entry side thermometer 9 by the finish rolling entry side temperature monitoring unit 51. Until it is acquired, the process proceeds to step S2.
[0063]
Next, in step S2, the profile acquisition unit 53 calculates the difference between the current temperature distribution in the width direction of the sheet bar 19 acquired in step S1 and the preset target temperature distribution.
[0064]
Next, in step S <b> 3, the profile acquisition unit 53 acquires a temperature distribution profile corresponding to the temperature distribution difference calculated in step S <b> 2 from the heating profile storage unit 52.
[0065]
At this time, the profile acquisition unit 53 also acquires information on the heating amount and position of the first to third transverse induction heating devices 31 to 33 stored in association with the profile.
[0066]
Next, in step S4, the energization amount setting unit 54, based on information on the heating amounts of the first to third transverse induction heating devices 31 to 33 acquired in step S3, the first to third. The value of the electric current sent through the coil arrange | positioned at the transverse type induction heating apparatuses 31-33 is set. At this time, it is preferable to set the value of the current flowing through the coil in consideration of the heating amount by the edge heating device 8b.
[0067]
Next, in step S5, the shift amount setting unit 55 includes information on the positions of the first to third transverse induction heating devices 31 to 33 acquired in step S3, and the first to third transverse types. It is determined whether or not the first to third transverse induction heating devices 31 to 33 need to be shifted from the information regarding the current position of the induction heating devices 31 to 33.
[0068]
As a result of the determination, when it is necessary to shift the first to third transverse induction heating apparatuses 31 to 33, the process proceeds to step S6, and the shift amount setting unit 55 acquires the first to third acquired in step S3. Based on the information regarding the positions of the third transverse type induction heating devices 31 to 33, the shift amount of the first to third transverse type induction heating devices 31 to 33 is set, and then the process proceeds to step S7.
[0069]
On the other hand, if it is not necessary to shift the first to third transverse induction heating apparatuses 31 to 33, the process skips step S6 and proceeds to step S7.
[0070]
In step S7, the heating device control command unit 56 controls the first to third transverse induction heating devices 31 to 33 to operate with the values set in step S4 and step S6. A signal is transmitted to the heating device 8.
The heating device 8 operates the first to third transverse induction heating devices 31 to 33 based on the control command signal to heat the seat bar 19.
[0071]
As described above, in the present embodiment, the difference between the temperature at the center of the strip steel plate 20 measured by the finish rolling thermometer 11 and the temperature at both ends is 20 [° C.] or less. Since the sheet bar 19 is heated by controlling the heating device 8, the steel plates 20a and 20b having substantially the same characteristics as those manufactured without the striping can be easily performed without complicated control. Can be manufactured. Thereby, the steel plates 20a and 20b of good quality can be manufactured while improving the productivity in the hot rolling line 2.
[0072]
Moreover, if it is set as the structure mentioned above, the various problems which arise when manufacturing a wide steel plate can also be solved. Specifically, for example, it is possible to reduce the middle elongation and the ear wave of the steel sheet, and to prevent the meandering of the steel sheet during rolling as much as possible.
[0073]
Further, in the present embodiment, the magnetic field is generated in the plate thickness direction of the sheet bar 19 to heat the sheet bar 19, so that the temperature distribution in the width direction of the sheet bar 19 is easily and reliably controlled. be able to.
[0074]
In addition, in this Embodiment, although the case where two strips of the steel plate 20 for a winding were mentioned as an example and demonstrated was demonstrated, the system, apparatus, and method of this Embodiment take two strips of the steel plate 20 for a striping. The present invention is not limited to the case, and the same can be applied to the case where the strip steel plate 20 is n stripped (n is a natural number of 3 or more).
[0075]
For example, a steel sheet for preparation with a width of 1820 [mm] is manufactured, three steel sheets for preparation with the above-mentioned preparation are prepared, and three steel sheets with a product width of 600 [mm] and a thickness of 2 [mm] are obtained. May be formed.
[0076]
Moreover, in this Embodiment, although the heating apparatus 8 was comprised using the three transverse type induction heating apparatuses 31-33, depending on the kind, width, etc. of the steel plate for preparation to manufacture, a sheet | seat is used. There may be a case where only the central portion of the bar 19 needs to be heated. In such a case, the central portion of the seat bar 19 may be heated using one transverse induction heating device.
[0077]
In addition, when n-stripping (n is a natural number greater than or equal to 3) of the steel plate for striping, the temperature at the stripping portion of the steel plate for stripping and the temperature at both ends are substantially the same. The heating device 8 can be configured by combining any number of transverse induction heating devices.
In other words, the number of transverse induction heating devices is not limited to three, and may be any number.
[0078]
Further, in the present embodiment, the profile of the temperature distribution in the width direction of the sheet bar 19 is stored in advance in the heating profile storage unit 52, but for the preparation measured by the finish rolling delivery thermometer 11. Based on the temperature distribution in the width direction of the steel plate 20, the heating amount and the shift amount of the first to third transverse induction heating devices 31 to 33 may be set.
[0079]
More specifically, for example, the results of the temperature distribution in the width direction of the sheet bar 19 measured by the finish rolling entry thermometer 9 and the width of the strip steel plate 20 measured by the finish rolling exit thermometer 11. Learn the temperature distribution results in the direction. Then, the heating device 8 is controlled based on the learned result so that the temperature distribution in the width direction of the strip steel plate 20 measured by the finish rolling thermometer 11 becomes a predetermined target value. May be.
[0080]
In the present embodiment, the finish rolling entry side thermometer 9 is arranged in front of the heating device 8, but the finish rolling entry side thermometer 9 is arranged after the heating device 8 and feedback control is performed. The heating device 8 may be controlled.
[0081]
(Other embodiments of the present invention)
In order to operate various devices to realize the functions of the above-described embodiments, program codes of software for realizing the functions of the above-described embodiments are provided to an apparatus or a computer in the system connected to the various devices. What is implemented by operating the various devices according to a program supplied and stored in a computer (CPU or MPU) of the system or apparatus is also included in the scope of the present invention.
[0082]
In this case, the program code itself of the software realizes the functions of the above-described embodiments, and the program code itself and means for supplying the program code to the computer, for example, the program code are stored. The recorded medium constitutes the present invention. As a recording medium for storing the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.
[0083]
Further, by executing the program code supplied by the computer, not only the functions of the above-described embodiments are realized, but also the OS (operating system) or other application software in which the program code is running on the computer, etc. Such a program code is also included in the embodiment of the present invention even when the functions of the above-described embodiment are realized in cooperation with the embodiment.
[0084]
Further, after the supplied program code is stored in the memory provided in the function expansion board of the computer or the function expansion unit connected to the computer, the CPU provided in the function expansion board or function expansion unit based on the instruction of the program code Etc. perform part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.
[0085]
【The invention's effect】
As described above, according to the present invention, the roughly rolled sheet bar is passed through the first to n-th rolling stands to perform finish rolling, and when manufacturing the steel sheet for stripping, Using the coarse bar heating device, the difference between the temperature of the both ends in the width direction of the roughly rolled sheet bar and the temperature of the strip portion to be striped into a plurality of strips is within a predetermined temperature range. By controlling the temperature of the rough rolled sheet bar, Since the temperature at both ends of the steel sheet for finishing after the finish rolling and the temperature of the part to be grounded by the plurality of strips are made substantially the same, the steel sheet for striping is made into a plurality of strips. Each steel plate formed by the striping can have substantially the same characteristics as a steel plate manufactured without striping. Thereby, it is possible to manufacture a steel plate with good quality while improving the productivity in the hot rolling line.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of the present invention and showing an example of a schematic configuration of a hot rolling facility.
FIG. 2 is a diagram showing an embodiment of the present invention and showing a state in which a steel plate for striping is striped.
FIG. 3 is a view showing a hot rolling line showing an embodiment of the present invention and showing an enlarged region where a coarse bar heating device is provided.
FIG. 4 is a diagram illustrating an embodiment of the present invention and illustrating an example of a configuration of a transverse induction heating apparatus.
FIG. 5 is a block diagram illustrating an example of the configuration of a temperature control device according to an embodiment of the present invention.
FIG. 6 is a diagram showing an embodiment of the present invention and showing an example of a temperature distribution in the width direction of a sheet bar and a strip steel plate.
FIG. 7 is a diagram showing an embodiment of the present invention and showing an example of the relationship between the temperature of the steel sheet for stripping and the yield point.
FIG. 8 is a flowchart illustrating an example of a processing operation of the temperature control device according to the embodiment of this invention.
[Explanation of symbols]
1 Hot rolling equipment
2 Hot rolling line
3 Slitter line
8 Heating device
9 Finishing rolled thermometer
10 Finishing mill
11 Finishing rolling delivery thermometer
17 Temperature controller
19 Seat bar
20 Stripping steel plate
31-33 transverse type induction heating device

Claims (3)

Sheeting in a hot rolling line in which the roughly rolled sheet bar is passed through first to n-th rolling stands to produce a sheet steel for sheeting that is striped into a plurality of strips in a predetermined post-process. A method for manufacturing a steel sheet for a vehicle,
In the temperature distribution in the width direction of the steel sheet for stripping at a predetermined position behind the n-th rolling stand, the temperature at both ends in the width direction of the steel sheet for stripping is stripped to the plurality of strips. A temperature control step for controlling the temperature of the stripping portion to be substantially the same ,
In the temperature control step, so that the difference between the temperature at both ends in the width direction of the rough-rolled sheet bar and the temperature of the strip portion to be striped into the plurality of strips is within a predetermined temperature range, A method of manufacturing a steel sheet for stripping in a hot rolling line, wherein the temperature of the roughly rolled sheet bar is controlled using a coarse bar heating device . In the temperature control step , a magnetic field is generated in the thickness direction of the rough-rolled sheet bar by the rough-bar heating device, the temperatures at both ends in the width direction of the rough-rolled sheet bar, and the plural The temperature of the rough-rolled sheet bar is controlled so that the difference from the temperature of the stripped portion that is stripped into the strip is within a predetermined temperature range . A method for manufacturing a steel sheet for striping in a hot rolling line. In the temperature control step , the temperature is controlled so that the difference between the temperature at both ends in the width direction of the steel plate for stripping and the temperature of the stripped portion stripped by the plurality of strips is about 20 ° C. or less. The manufacturing method of the steel plate for a winding in the hot rolling line of Claim 1 or 2 characterized by the above-mentioned.

Images