Technical field
[0001]
　The present disclosure relates to width reduction method and the width reduction device.
Background technique
[0002]
　The rough rolling step of hot rolling process, there are cases where bending deformation occurs called camber steel. In the rough rolling process, as one of the causes of camber on the steel sheet occurs, and the temperature deviation in the width direction of the slab occurring in the heating furnace.
[0003]
　The disclosed in Japanese Patent Laid-Open No. 3-254301 technique, when there is a temperature deviation in the width direction of the slab, by relatively moving a pair of molds in the conveying line direction, and the width of the pair of side guides conveying line upstream by moves with the transport line center screw down device, it is suppressed camber.
[0004]
　In the technique disclosed in Japanese Unexamined Utility Model Publication No. 62-96943, by providing a guide device with a guide roll entry side or exit side of slab sizing press, the width direction of the center position and the sizing press in the width direction of the slab It is suppressed camber by constraining the slab so as to match the center position of the.
Summary of the Invention
Problems that the Invention is to Solve
[0005]
　The disclosed in Japanese Patent Laid-Open No. 3-254301 technique, although slab camber at the exit side of the width reduction device is suppressed, thickness deviation on the side surface of both the width direction of the slab cross-section as a dog-bone shape (asymmetry of thickness distribution) is generated.
[0006]
　Further, in Japanese Utility Model 62-96943 discloses a method, when the temperature deviation slab width direction is generated, the camber of the slab in the press exit side is not suppressed. Further, thickness deviation on the side surface of both the width direction of the slab cross-section (asymmetry of thickness distribution) is generated.
[0007]
　Even without camber after press, when the side surface portions of both the width direction of the slab cross-section is thickness deviation (asymmetry of thickness distribution), then when it is rolled by the horizontal rolls, side plate thickness is thicker plate the thickness extending in the longitudinal direction than the thin side. As a result, the camber slab occurs.
[0008]
　In view of the above circumstances, the present disclosure is intended to suppress the slab camber that occurs through the width reduction process of the slab in the rough rolling step in the hot rolling process.
Means for Solving the Problems
[0009]
　Width reduction method of the present disclosure, an incident angle of the slab for a pair of width reduction means is arranged on a slab transfer line to a width reduction of the slab is acquired at least one post-width reduction before and width reduction It is changed based on the information of the slab.
[0010]
　Width reduction device of the present disclosure is disposed on the slab transfer line, and a pair of width reduction means for width reduction by pressing the slab from both sides in the width direction of the slab, the transport than the pair of width reduction means It is disposed upstream of the line, and the slab incident angle changing means for changing an incident angle of the slab, and the slab information obtaining means for obtaining information of at least one of the slab after width rolling before and width reduction, slabs information acquisition based on the information of the slab obtained by means comprises a slab incidence angle controlling means for controlling the slab incident angle changing means.
Effect of the invention
[0011]
　The present disclosure, it is possible to suppress the slab camber that occurs through the width reduction process of the slab in the rough rolling step in the hot rolling process.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012]
FIG. 1 is a schematic diagram of a rough rolling step of hot rolling process in which the width reduction of the first embodiment method and width reduction device is used.
FIG. 2 is a plan view schematically showing a width rolling device of the first embodiment.
3 is a plan view showing a state before the width reduction of the slab in the width reduction device of the first embodiment.
In [4] 3, while the width reduction of the distal end side of the slab, showing a state in which Grant incident angle by moving the tail end side of the slab sandwiched by a pair of plate members in the width direction of the conveying line to the slab it is a plan view.
Is [5] a plan view showing a large state of the incident angle by moving the tail end side of the slab in the width direction of the conveyor line than in the state of FIG.
[6] Furthermore than the state of FIG. 5 is a plan view showing a large state of the incident angle by moving the tail end side of the slab in the width direction of the conveying line.
[7] tail side of the slab is a plan view showing a state in which the width reduction.
8 is a plan view showing a state where the width reduction slab is moved downstream of the conveying line than the width reduction member.
9 is a plan view showing a state of the width reduction of the slab width reduction method of Comparative Example 1.
It is a plan view showing a state in which [10] has a width reduction of the slab width reduction method of Comparative Example 2.
Is a conceptual diagram illustrating a FIG. 11 width reduction temperature distribution in the cross section shape and the width direction of the slab before the slab.
It is a conceptual diagram showing a slab of cross sectional shape after [12] width reduction.
13 is a plan view showing a state before the width reduction of the slab in the width reduction device of the second embodiment.
[Figure 14] is a L14-L14 line sectional view of FIG. 13 shows the means used to determine the width direction of the plate thickness deviation of the width reduction before the slab.
[Figure 15] is a first modification of the width reduction device of the second embodiment, cross-sectional view (sectional view corresponding to FIG. 14 showing the means used to determine the width direction of the plate thickness deviation of the width reduction before the slab ) it is.
[Figure 16] is a second modification of the width reduction device of the second embodiment, cross-sectional view (sectional view corresponding to FIG. 14 showing the means used to determine the width direction of the plate thickness deviation of the width reduction before the slab ) it is.
Is [17] a conceptual diagram showing a slab of cross sectional shape after width reduction (conceptual diagram corresponding to FIG. 12).
18 is a plan view showing a state before the width reduction of the slab in the width reduction device of the third embodiment.
Is [19] a conceptual diagram showing a slab of cross sectional shape after width reduction (conceptual diagram corresponding to FIG. 12).
FIG. 20 is a plan view schematically showing a width rolling device of the fourth embodiment.
21 is a plan view showing a state before the width reduction of the slab in the width reduction device of the fourth embodiment.
In [22] FIG. 21, while the width reduction of the distal end side of the slab, showing a state in which Grant incident angle by moving the tail end side of the slab sandwiched by a pair of plate members in the width direction of the conveying line to the slab it is a plan view.
Is [23] a plan view showing a large state of the incident angle by moving the tail end side of the slab in the width direction of the conveyor line than in the state of FIG. 22.
[24] Furthermore than the state of FIG. 23 is a plan view showing a large state of the incident angle by moving the tail end side of the slab in the width direction of the conveying line.
It is a plan view showing a state in which FIG. 25 tail side of the slab is the width reduction.
FIG. 26 is a plan view showing a state where the width reduction slab is moved downstream of the conveying line than the width reduction member.
FIG. 27 is a plan view schematically showing a width rolling apparatus of the fifth embodiment.
[Figure 28] is a L28-L28 line sectional view of FIG. 27 shows the means used to determine the width direction of the plate thickness deviation of the slab after width rolling.
[Figure 29] is a first modification of the width reduction device of the fifth embodiment, cross-sectional view corresponding to a cross-sectional view (FIG. 28 showing the means used to determine the width direction of the plate thickness deviation of the slab after width reduction ) it is.
[Figure 30] is a second modification of the width reduction device of the fifth embodiment, cross-sectional view corresponding to a cross-sectional view (FIG. 28 showing the means used to determine the width direction of the plate thickness deviation of the slab after width reduction ) it is.
[FIG. 31] is a plan view schematically showing a modification of the width reduction device of the first embodiment.
In the width reduction method using the width reduction device [32] Figure 31 is a plan view showing a state in which the incident angle was applied by moving the slab sandwiched by a pair of roll members in the width direction of the conveying line to the slab .
DESCRIPTION OF THE INVENTION
[0013]
　Hereinafter, with reference to the drawings, a description will be given width reduction method and the width reduction device according to an embodiment of the present disclosure.
[0014]

　Before describing the width reduction method and the width reduction device of the first embodiment will be described on the basis of the hot-rolled process the steel sheet in Figure 1.
[0015]
(Hot rolling process)
　as shown in FIG. 1, in the rough rolling step in the hot-rolled process the steel sheet, first, heated to a predetermined temperature in a heating furnace 10 slab S is discharged from the outlet 10A of the heating furnace 10, It is placed on the conveying line L. The conveying line L is a path for transporting the slabs S discharged from the discharge port 10A to the downstream in the conveying direction (direction indicated by the arrow C in FIG. 1), for example, a belt conveyor superior roller conveyors, heat resistance It consists of such. The transport line L, if the transport slab S, is not limited to the conveyor as described above.
[0016]
　Next, the slab S ejected from the heating furnace 10, the width reduction device 20 by rolling in the width direction of the present embodiment (hereinafter referred to as as "width reduction".) By the. Slab S which is the width reduction by the width reduction device 20 is conveyed along the conveying line L on the downstream of the horizontal rolling mill 12.
[0017]
　Slab S which has been conveyed in the horizontal rolling mill 12, pressure by the horizontal rolling mill 12 in the thickness direction (the direction indicated by the arrow T in FIGS. 11 and 12) (hereinafter referred to as as "thickness rolling".) It is.
[0018]
　The thickness rolled slab S has a vertical roll 14 from the horizontal rolling mill 12 downstream of the conveying line L, and repeatedly moved between the horizontal roll 16 located downstream from the vertical rolls 14, the vertical rolls 14 the thickness rolling by minute width reduction and horizontal roll 16 by repeats. Thus, the slab S is formed, for example, semi-finished product of about thickness 40mm called coarse bar B.
[0019]
　Thereafter, the coarse bar B is fed to the finish rolling step in the hot rolling process, a plurality (four in this embodiment) is finish rolled by the horizontal rolls 18 of the wound by the take-up roll 19.
[0020]
(Width reduction device)
　then the width reduction device of the present embodiment will be described.
　As shown in FIG. 2, the width reduction device 20 is a device for the width reduction of the discharge slab S from the heating furnace 10 in the rough rolling step, the width reduction member 22 as an example of a pair of width reduction means, a pair of plate members 24 as an example of a slab incident angle changing means, a temperature sensor 26 as an example of a slab information acquisition unit, and a control device 28 as an example of a slab incidence angle controlling means. Note that, in FIGS. 4-8, it is not shown the control unit 28 and the temperature sensor 26.
[0021]
　A pair of width reduction member 22 is arranged on the conveying line L of the slab S, and is configured to width reduction of the slab S is pressed from both sides in the width direction of the slab S. Specifically, the width reduction member 22 is movable in the width direction of the conveying line L (the same direction as the width direction of the slab S before width reduction (the direction indicated by the arrow W in FIG. 2)) by the pressing mechanism 30 ing. A pair of width reduction member 22 is adapted to the width reduction by repeatedly pressing the slab S from both sides in the width direction by the pressing force from the pressing mechanism 30. The pressing mechanism 30 is controlled by a control unit 28 described later. As the pressing mechanism 30, for example, a mechanism using an electric motor, a mechanism using the hydraulic cylinders and the like.
[0022]
　A pair of plate members 24 is disposed on the upstream side of the conveying line L to a pair of width reduction member 22, a guide along the conveying line L extending toward the pair of width reduction member 22. The plate member 24 is adapted to be inclined with respect to the width direction movable and conveying line center LC of the conveying line L (center in the width direction of the conveying line L) by the moving mechanism 32. The pair of plate members 24, the incident angle theta (details will be described later by the movement force from the moving mechanism 32 with respect to the width direction of the position and the conveying line center LC of the conveying line L of the slab S across the slab S from both sides in the width direction ) it has to be able to adjust. The moving mechanism 32 is controlled by a control unit 28 described later. As the moving mechanism 32, for example, a mechanism using an electric motor, a mechanism using the hydraulic cylinders and the like. The plate member 24 is adapted to plate surface 24A in the width direction inner side of the conveying line L (carrying line center LC side) comes into contact with the side face LF of the width direction of the slab S.
[0023]
　Temperature sensor 26 is arranged in plural and in the width direction of the conveying line L between the heating furnace 10 and the width reduction device 20 measures the temperature (surface temperature) of the slab S before width reduction. Temperature information measured at a plurality of temperature sensors 26 (temperature distribution), are sent to the controller 28.
[0024]
　The control unit 28, based on the temperature distribution in the width direction of the slab S sent from a plurality of temperature sensors 26, the moving mechanism 32 is operated with the widthwise position of the conveying line L of the pair of plate members 24 transport controlling the angle for the line center LC, respectively. Specifically, according to the width direction of the temperature deviation of the slab S, the control device 28, the low side (hereinafter referred to as the "cold side".) Of the temperature of the slab S is the rear end side LFL of It controls the movement mechanism 32 away from the transport line center LC. Thereby, inclined with respect to the conveying line center LC with the plate member 24 is moved in the width direction of the conveying line L, the incident angle θ is applied to the slab S. Here, the "angle of incidence of the slab S theta" refers to the angle of incidence of the slab S for a pair of width reduction member 22 (the angle of the slab center SC for conveying line center LC).
[0025]
　The control unit 28, in addition to temperature information of the slab S, for example, the width reduction method of the slab, the dimensions of the slab S, the width reduction amount of the slab S, so information such as steels slab S is sent there. These information may be input by an operator from an external input device, it may be acquired by other methods. The control device 28, in addition to temperature information of the slab S, the width reduction method of the slab, the dimensions of the slab S, the width reduction amount of the slab S, while changing an incident angle θ on the basis of at least one of the information steels slab S it may be. In other words, it may be determined incident angle θ on the basis of the temperature distribution and the at least one information.
[0026]
　Further, on the conveying line L, it is sent (as an example an optical sensor) position sensor (not shown) for detecting the position of the slab S is provided with a plurality, in the position information control unit 28 of the slab S on the conveying line L It has become way.
[0027]
(Width reduction method)
　will be described next width reduction method of the first embodiment. In the width reduction method of this embodiment, a width reduction device 20.
[0028]
　First, the temperature of the heated slab S has been discharged from the discharge port 10A of the heating furnace 10 is measured at a plurality of temperature sensors 26, and sends the measured temperature information (temperature distribution) to the control device 28.
[0029]
　Next, as shown in FIG. 2, sandwiched from both sides by the slab S in a pair of plate members 24, align the width direction position of the conveying line center LC in the width direction position of the slab center SC (so-called centering). Thereafter, as shown in FIG. 3, is separated is moved from the slab S to the pair of plate members 24 widthwise outer conveying line L (the side away from the transfer line center LC).
[0030]
　Next, the control device 28 the temperature information based on the acquired controls the moving mechanism 32 for imparting the incident angle θ to the slab S in the case where there is a temperature difference in the width direction to the slab S. Specifically, as shown in FIGS. 4 to 6, again sandwiched from both sides in the width direction of the slab S in a pair of plate members 24, in this state, the cold side of the slab S side LFL (FIGS. 4 to 6 in the rear end side) of the upper slab S confer incident angle θ to the slab S away from the transfer line center LC. Note that the incident angle θ in this embodiment is set according to the width reduction progress of temperature deviation and the slab S in the width direction of the slab S. Specifically, when the width reduction of the front end portion of the slab S (see FIG. 4), since the camber is not substantially caused, the incidence angle θ to a value close to zero or zero, the width reduction progress of the slab S ( in other words, increasing the incident angle θ in accordance with the longitudinal direction of width reduction position of the slab S) proceeds (see FIG. 5, FIG. 6). Then, (see FIG. 7) to reduce the incident angle θ as the width reduction approaches the tail end of the slab S, the time width reduction of the tail end of the slab S is set to be the incident angle θ a value close to zero or zero (see Figure 8). Also, the increase of the incident angle theta, is set to increase as the temperature difference in the width direction of the slab S is large. Note that the width reduction progress of the slab S, is calculated based on the position information of the slab S from the position sensor.
[0031]
　Further, the incident angle theta, in addition to temperature information of the slab S, the width reduction method of the slab S, the dimensions of the slab S, the width reduction amounts of the slab S, be varied based on the type of steel of at least one information of the slab S preferable. In addition to temperature information of the slab S, it can be further by setting the incident angle θ on the basis of the information about the slabs S, obtaining the incident angle θ of more appropriate slab S.
[0032]
　After the slab S has moved downstream of the conveying line L than the pair of plate members 24, as shown in FIG. 7, the control device 28 is positioned in the width direction of the plate member 24 by operating the moving mechanism 32 together back to the original position, to return the inclination with respect to the transport line center LC of the plate member 24 to the original inclination. Thereafter, as shown in FIG. 8, the pair of plate members 24 enters a standby state in a state of being spaced apart from each other in the width direction of the conveying line L.
[0033]
　The control device 28, there is no temperature deviation in the width direction to the slab S when (or allowable lower limit value), and keeps the state of being spaced apart a pair of plate members 24 from the slab S (FIG. 3 shown state) . Therefore, the slab S is the width reduction by a pair of width reduction member 22 through between the pair of plate members 24.
[0034]
　A description will now be given of advantages of the first embodiment.
　First, it describes the width reduction method of a slab S of Comparative Examples 1 and 2 which are not included in the present disclosure, then, differences will be described operation and effect of the present embodiment. Hereinafter, as shown in FIG. 11, description will be given of a case where there is a temperature difference in the width direction to the slab S. In FIG 11, the vertical axis K indicates the temperature of the slab S, the difference in temperature in the width direction at both ends of the slab S indicates the temperature deviation [Delta] K.
[0035]
　In Comparative Example 1, as shown in FIG. 9, after the combined widthwise position of the slab center SC of the slab S in the width direction position of the conveying line center LC in the pair of plate members 24, a pair of plate members 24 in a state of being spaced apart from the slab S (unconstrained) to a width reduction of the slab S. The width reduction method of Comparative Example 1, a pair of width reduction member 22 is a slab S is the width reduction by reciprocating symmetrically to the conveying line center LC. At this time, since the plate thickness and the side surface portion LP is large deformation of both than the center portion in the width direction of the slab S is large, deformed into a shape of so-called dog-bone. If there is no temperature deviation in the width direction of the slab S, the sectional shape of the slab S is symmetrical with respect to the slab center SC, does not occur camber. However, if there is a temperature deviation in the width direction to the slab S, of both of the side surface portion LP of the slab S, high temperature side (hereinafter referred to as "high temperature side".) Deformation resistance of the side surface portion LPH of It is smaller than the side surface portions LPL on the low temperature side, easily deformed. Therefore, even as the same amount of movement of both the plate member 24, the deformation amount in the width direction side portions LPH hot side than the side surface portions LPL of the cold side of the slab S is increased. That is, as shown in Figure 11, (bisecting line width of the slab S) slab center SC before width reduction which was consistent with the conveying line center LC, after width rolling, the hot-side side surface portion LPH Go to the side, the SCB indicated by the two-dot chain line.
　At this time, the side surface portion LPH hot side of the slab S, as compared with the side surface portion LPL on the low temperature side, so easily deformed, even the plate thickness increases (see the broken line in FIG. 11). Therefore, not symmetrical with respect to the cross-sectional shape of the slab S after undergoing width reduction step slab center SC (see broken lines in FIG. 11) (or slab center SCB), i.e., the plate at the side surface portion LP of both slab S deviation in thickness occurs.
　Further, deviation of the deformation of the slab S is also manifested as a deviation of the elongation in the longitudinal direction of the slab S. Specifically, large longitudinal extension of the slab S is in the high temperature side of the side surface portion LPH of the slab S, the longitudinal extension of the slab S is reduced in side portions LPL on the low temperature side. Thus, the slab S is bent so hot side surface LFH is convex when the width reduction. As a result, the longitudinal deviation of the elongation of the slab S at the width reduction of the slab S, the slab S after undergoing width reduction step, camber occurs.
　Thus, if there is a temperature deviation in the width direction to the slab S, the width reduction method of Comparative Example 1, when going through the width reduction step, the plate on the side surface portion LP of both slab S with camber occurs slab S thickness deviation occurs. When the slab S in such a width direction of the thickness deviation is thick rolled with horizontal rolling mill 12, among both side portions LP of the slab S, the side surface portion LPH plate is thick side, the plate thickness thin longitudinal elongation than the side surface portions LPL side becomes large, the camber of the slab S is further increased.
[0036]
　On the other hand, in Comparative Example 2 corresponds to Japanese Utility Model 62-96943, as shown in FIG. 10, the widthwise position of the slab center SC of the slab S in the width direction position of the conveying line center LC in the pair of plate members 24 the slab S while restrained in a state to match the width reduction. The Japanese Utility Model 62-96943, although the mechanism of the camber reduction is not described, the inventors have intensively studied and, as a result, have found that the following phenomenon occurs. The width reduction method of Comparative Example 2, the width reduction portion of the widthwise position of the slab center SC along with the restraining in accordance with the widthwise position of the conveying line center LC slab S of the slab S, the moment M occurs. This moment M, of both of the side surface portion LP of the slab S, the compressive force FC is applied to the longitudinal direction of the high-temperature side of the side surface portion LPH in the slab S, tensile longitudinal side portions LPL the slab S on the low temperature side force FT acts. Therefore, the deformation of the slab S by width reduction, by longitudinal compression force acts on the side surface portions LP side of the high temperature side becomes difficult to deform as compared with the case without restraint. On the other hand, the side surface portions LPL Oite on the low temperature side is easily deformed as compared with the case without restraint by longitudinal tensile force is exerted. As a result, among the both side portions LP of the slab S, deformability deviation of side portions LPL side portion LPH and the low-temperature side of the high-temperature side is decreased. Therefore, than Comparative Example 1, also becomes small thickness deviation camber of the slab S. However, the moment M given by the constraint, because it is not based on information of the temperature deviation in the width direction of the slab S is responsible for causing the camber and thickness deviation, only not lead to eliminate the camber and thickness deviation or, in some cases resulting in excessive to generate camber and thickness deviation.
[0037]
　Inventors, the study evolved, if applied properly moment based on the information of the slab, even if the temperature distribution in the width direction to the slab S, the side surface portion LPH and the low-temperature side of the high-temperature-side side surface portion LPL the deformability of the led to the idea of the possible to the same extent.
　In the present embodiment, since the rear end of the cold side of the side surface LFL of the slab S based on the acquired temperature information is imparted the incident angle θ to the slab S away from the transport line center LC, slabs as in Comparative Example 2 compared with the case where restraining together widthwise position of the slab center SC of S in the width direction position of the conveying line center LC, it is possible to provide an appropriate moment M. Thus, among the both side portions LP of the slab S, it can be appropriately adjusted tensile force FT acting on the side surface portions LPL compressive force FC and the low temperature side acting on the side surface portion LPH the high temperature side. Therefore, the high temperature side side surface portion LPH and ease of deformation of the side surface portions LPL of the cold side of the slab S can be comparable. As a result, the amount of deformation of the width direction of the slab S, the amount of deformation in the thickness direction, can be comparable to the amount of deformation of the longitudinally side portions LPL side portions LPH and the low temperature side of the high temperature side, a width reduction step the camber and asymmetry in the width direction of the cross section of the slab S of the slab S after undergoing (i.e., thickness deviation) can be suppressed. As a result, it can be suppressed camber when carrying out the thickness rolling by the horizontal rolling mill 12 to the slab S. In FIG 12, it illustrates a cross-sectional shape of the slab S which according to this embodiment is wide pressure indicated by broken lines, the cross-sectional shape of the slab S, which is the width reduction in the technique Comparative Example 1 by a two-dot chain line.
[0038]
　In particular, in the present embodiment, as shown in FIGS. 4 to 6, and the incident angle θ is changed in accordance with the width reduction progress of temperature deviation and the slab S in the width direction of the slab S. Specifically, when the width reduction of the front end portion of the slab S is the incident angle θ is a value close to zero or zero, by increasing the incident angle θ in accordance with the width reduction progress of the slab S progresses, the slab S as the width reduction of the tail end of the approaches to reduce the incident angle theta, when the width reduction of the tail end of the slab S is varied so that the incident angle theta a value close to zero or zero. Therefore, it is possible to more appropriately adjust the tension FT acting on the side surface portions LPL compressive force FC and the low temperature side acting on the side surface portion LPH hot side of the slab S.
[0039]
　In the first embodiment, a configuration for setting the angle of incidence θ at a temperature distribution on the surface of the slab S, the present disclosure is not limited to this structure. For example, the surface temperature of the estimated average temperature or slab S in a predetermined range from the side LF to the width direction of the slab S, based on the heat transfer theory, by estimating the temperature of thickness direction center portion of the slab S, the slab S calculating a temperature deviation in the width direction, it may be configured to set the incident angle θ on the basis of the temperature deviation. The case of using this configuration, the properties such as deformation ease when the width reduction of the slab S, as compared with the first embodiment, more for accurately obtained, the camber of the slab S generated through the width reduction process of the slab and it is possible to suppress the width direction of the plate thickness deviation.
[0040]
　In the first embodiment, a configuration for changing the incident angle θ in accordance with the width reduction progress of the slab S, the present disclosure is not limited to this structure. For example, the incident angle θ may be constant. The above structure may be applied to embodiments described below.
[0041]

　Next, a description will be given width reduction method and the width reduction device of the second embodiment. The same components as in the first embodiment are denoted by the same reference numerals, and description thereof is appropriately omitted.
[0042]
　As shown in FIG. 13, the width reduction device 40 of the present embodiment, except for Configurations that provided between the heating furnace 10 and the plate member 24 of the CCD camera 42 as an example of a slab information acquisition means, other configurations It has the same configuration as the width reduction device 20 of the first embodiment.
[0043]
　CCD camera 42 is arranged on both widthwise outer conveying line L, and is configured to capture the sides LF of both slab S from each side. The image captured by the CCD camera 42 is adapted to be sent to the controller 28.
[0044]
　In the control apparatus 28 of the present embodiment, it calculates the thickness deviation of the sides LF of both slabs S based on image information from the CCD camera 42. Then, the controller 28 operates the moving mechanism 32 plate thickness is thick side aspect LFB confer incident angle θ to the slab S to be separated from the conveyor line center LC.
[0045]
　Next, a description will be given width reduction method of the present embodiment. In the width reduction method of this embodiment, a width reduction device 40.
　The width reduction method of this embodiment, except for the configuration to set the angle of incidence θ in place of the temperature distribution in the width direction of the slab S in thickness deviation of both sides LF of the slab S, other configurations are the first embodiment is the same as the width reduction methods. Thus, for the control procedure of the incident angle θ of the slab S by the control unit 28 are the same as FIGS. 4 to 6.
[0046]
　The width reduction step of the present embodiment, the slab S image information control apparatus on the basis of the 28 acquired from the CCD camera 42 controls the moving mechanism 32 when there is a thickness deviation at both sides LF of the slab S to grant the incident angle θ to the slab S. Specifically, sandwiching the slab S from both widthwise sides by a pair of plate members 24, in this state, the trailing edge of the plate thickness of the slab S is thick side aspect LFB (FIGS. 4 to 6, the upper side) and it controls the moving mechanism 32 away from the conveyor line center LC is inclined moves the plate member 24, imparts an incident angle θ on the slab S. Note that θ the angle of incidence of the present embodiment is set in accordance with the width reduction progress of thickness deviation and the slab S side LF of both slab S. Specifically, when the width reduction of the front end portion of the slab S (see FIG. 4), since the camber deformation is not substantially caused, the incidence angle θ to a value close to zero or zero, the width reduction progress of the slab S (in other words, the longitudinal direction of width reduction position of the slab S) is to increase the incident angle θ in accordance progresses (see FIG. 5, FIG. 6). Then, (see FIG. 7) to reduce the incident angle θ as the width reduction approaches the tail end of the slab S, the time width reduction of the tail end of the slab S is set to be the incident angle θ a value close to zero or zero (see Figure 8). Also, the increase of the incident angle theta, is set to increase the larger the thickness deviation of both sides LF of the slab S. Note that the width reduction progress of the slab S, is calculated based on the position information of the slab S from the position sensor.
[0047]
　Further, the incident angle theta, in addition to the thickness deviation of both sides LF of the slab S, the width reduction method of the slab S, the dimensions of the slab S, the width reduction amount of the slab S, the steel grade of at least one information of the slab S it is preferable to change based. In addition to the thickness deviation of both sides LF of the slab S, it can be further by setting the incident angle θ on the basis of the information about the slabs S, obtaining the incident angle θ of more appropriate slab S.
[0048]
　Next, the function and effect will be described in the second embodiment. As for effects obtained by the same configuration as in the first embodiment will be omitted. Hereinafter, as shown in phantom lines in FIG. 17 (two-dot chain line), a case where there is a deviation in plate thickness on the sides LF of both slab S.
[0049]
　When carrying out the width reduction in the presence of the thickness deviation sides LF of both slab S, (in FIG. 17, the left side surface) thickness thin side aspect LFA is a side section LPA containing, plate thickness is thick (in FIG. 17, right side) side of the side surface LFA easily deformed from the side surface portion LPB including. Therefore, the slab S is the thickness direction of the deformation is larger than the side surface portion LPB of the thick side portions of LPA plate thickness is thin side where the plate thickness side (see the broken line in FIG. 17). Thus, the thickness deviation of the both sides LF of the slab S after width rolling is increased. In this state, when carrying out the thickness rolling by the horizontal rolling mill 12 to the slab S, camber occurs as side LFA of a convex (plate thickness is thin side in front width reduction) thick side plate thickness after the width reduction .
　In contrast, in the present embodiment, even if the thickness deviation sides LF of both slab S, can be set the incident angle θ of the slab S in accordance with the thickness deviation of both sides LF of the slab S. Therefore, it is possible to suppress the camber and the width direction of the plate thickness deviation of the slab S generated through the width reduction process of the slab S (see the broken line in FIG. 17). Thus, even if conducted thickness rolling by the horizontal rolling mill 12 to the slab S, the camber can be suppressed.
[0050]
　In the second embodiment, as shown in FIG. 14, has been calculated thickness deviation in the width direction both side surfaces of the slab S based on the image information captured by the CCD camera 42, the present disclosure is not limited to this structure. For example, as shown in FIG. 15, in place of the CCD camera 42, a distance sensor 44 with a plurality spaced apart in the width direction above the conveying line L, and the distance between the upper surface of the slab S to be conveyed measured, may the measured information as configured to calculate the width direction of the plate thickness deviation of the slab S based. Further, as shown in FIG. 16, by moving in the width direction of the conveying line L using a mobile device (not shown) of one of the distance sensors 44, measure the distance between the upper surface of the slab S, the measured information it may be calculated in the width direction of the plate thickness deviation of the slab S based.
[0051]

　Next, a description will be given width reduction method and the width reduction device of the third embodiment. The same components as in the first embodiment are denoted by the same reference numerals, and description thereof is appropriately omitted.
[0052]
　As shown in FIG. 18, the width reduction device 50 of the present embodiment, except for Configurations that provided between the heating furnace 10 and the plate member 24 of the CCD camera 52 as an example of a slab information acquisition means, other configurations It has the same configuration as the width reduction device 20 of the first embodiment.
[0053]
　CCD camera 52 is arranged on both widthwise outer conveying line L, and is configured to capture the sides LF of both slab S from each side. Image photographed by the CCD camera 52 is adapted to be sent to the controller 28.
[0054]
　In the control apparatus 28 of the present embodiment, it calculates the deviation of the coefficient of friction of sides LF of both slabs S based on image information from the CCD camera 52. For example, the difference between the state of fouling of the image information, it is possible to calculate the deviation of the coefficient of friction from the brightness distribution difference. For example, among the both sides LF, deposits the side LF adhesion amount of more side (scale), since the coefficient of friction is lowered to the width reduction member 22 from the side surface LF of deposition amount is small sides, both it can be calculated deviation of friction coefficient on the basis of the difference in adhesion amount of the deposit side LF. Further, for example, among the both sides LF, the sides LF of the high brightness side, since the friction coefficient is lower than the sides LF of the low luminance side, based on the difference in luminance of both sides LF of the friction coefficient deviation can also be calculated. Then, the control unit 28 (in FIG. 18, the upper side) friction coefficient by operating the moving mechanism 32 is high side aspect LFC confer incident angle θ to the slab S to be separated from the conveyor line center LC .
[0055]
　Next, a description will be given width reduction method of the present embodiment. In the width reduction method of this embodiment, a width reduction device 50.
　The width reduction method of this embodiment, except for the configuration to set the angle of incidence θ in the deviation of the coefficient of friction of both sides LF of the slab S instead of the temperature distribution in the width direction of the slab S, other configurations are the first embodiment is the same as the width reduction method forms. Thus, for the control procedure of the incident angle θ of the slab S by the control unit 28 are the same as FIGS. 4 to 6.
[0056]
　The width reduction step of the present embodiment, the control device 28 based on the image information of the slab S acquired from the CCD camera 52, controls the moving mechanism 32 when there is a deviation coefficient of friction of sides LF of both slab S the incident angle θ be applied to the slab S Te. Specifically, sandwiching the slab S from both widthwise sides by a pair of plate members 24, in this state, the trailing edge of the larger side sides LFC friction coefficient of the slab S (FIG. 4 to FIG. 6, the upper side) and it controls the moving mechanism 32 away from the conveyor line center LC is inclined moves the plate member 24, imparts an incident angle θ on the slab S. Note that θ the angle of incidence of the present embodiment is set in accordance with the width reduction progress of the deviation and the slab S of the friction coefficient of the side surface LF of both slab S. Specifically, when the width reduction of the front end portion of the slab S (see FIG. 4), since the camber deformation is not substantially caused, the incidence angle θ to a value close to zero or zero, the width reduction progress of the slab S (in other words, the longitudinal direction of width reduction position of the slab S) is to increase the incident angle θ in accordance progresses (see FIG. 5, FIG. 6). Then, (see FIG. 7) to reduce the incident angle θ as the width reduction approaches the tail end of the slab S, the time width reduction of the tail end of the slab S is set to be the incident angle θ a value close to zero or zero (see Figure 8). Also, the increase of the incident angle theta, is set to increase as the deviation of the coefficient of friction of both sides LF of the slab S is large. Note that the width reduction progress of the slab S, is calculated based on the position information of the slab S from the position sensor.
[0057]
　Further, the incident angle theta, in addition to the deviation of the coefficient of friction of both sides LF of the slab S, the width reduction method of the slab S, the dimensions of the slab S, the width reduction amount of the slab S, at least one of the information steels slab S it is preferable to change based on. In addition to the deviation of the coefficient of friction of both sides LF of the slab S, it can be further by setting the incident angle θ on the basis of the information about the slabs S, obtaining the incident angle θ of more appropriate slab S.
[0058]
　Next, the operation and effect of this embodiment are described. As for effects obtained by the same configuration as in the first embodiment will be omitted. Hereinafter, as shown in phantom lines in FIG. 19 (two-dot chain line), a case where a deviation of the coefficient of friction on the sides LF of both slab S.
[0059]
　When carrying out the width reduction in the presence of a deviation of both the friction coefficient on the side surface LF of the slab S, (19, right side) higher side of side LFC friction coefficient side portion LPC containing low coefficient of friction (in FIG. 19, left side) side of the side LFD hardly deformed from the side surface portion LPD including. Therefore, as shown in FIG. 19, the slab S is a side section LPD of low coefficient of friction side is the thickness direction of the deformation is larger than the side surface portion LPC of high friction coefficient side (see broken lines in FIG. 19 ) Thus, thickness deviation of the both sides LF of the slab S after width rolling is increased. In this state, when carrying out the thickness rolling by the horizontal rolling mill 12 to the slab S, the camber as side LFD of plate thickness is thick side (light side of the friction coefficient) is convex occur after width rolling.
　In contrast, in the present embodiment, even if there is a deviation of the coefficient of friction on both sides LF of the slab S, setting the incident angle θ of the slab S based on the deviation of the coefficient of friction of both sides LFD of the slab S since it can suppress the camber and the width direction of the plate thickness deviation of the slab S generated through the width reduction process of the slab S (see the broken line in FIG. 19). Thus, even if conducted thickness rolling by the horizontal rolling mill 12 to the slab S, the camber can be suppressed.
[0060]
　In the third embodiment, calculates the deviation of the coefficient of friction of both sides LF of the slab S based on the captured information in the CCD camera 52, the present disclosure is not limited to this structure. For example, to calculate a thickness deviation of both sides LF of the slab S from the information captured by the CCD camera 52 may be configured to determine the incident angle θ of the slab S based on the deviation thickness deviation and coefficient of friction. In this case, it is possible to sharing the CCD camera, it is possible to reduce the number of components constituting the apparatus.
[0061]

　Next, a description will be given width reduction method and the width reduction device of the fourth embodiment. The same components as in the first embodiment are denoted by the same reference numerals, and description thereof is appropriately omitted.
[0062]
(Width reduction device)
　as shown in FIG. 20, and the width reduction device 60 of the present embodiment, the CCD camera 62 in the width rolling exit side of slab S as an example of a slab information acquisition means is provided, the width reduction of the slab S except a configuration of determining the incident angle θ of the slab S in accordance with the camber in the delivery side, other configuration is the same configuration as the width reduction device 20 of the first embodiment.
[0063]
　CCD camera 62, (in other words, the downstream side of the pair of width reduction member 22) the outlet side width reduction of the slab S having a width reduction device 60 is disposed above the, width reduction portion of the slab S from above It is configured so as to shoot. The imaging area of ​​the CCD camera 62 is set in the area indicated by the two-dot chain line in FIGS. 20 to 26. Further, the image captured by the CCD camera 62 is adapted to be sent to the controller 28. Note that, in FIGS. 21 to 26 are not shown the control unit 28 and the CCD camera 62.
[0064]
　In the control apparatus 28 of the present embodiment, it calculates the camber of the width reduction portion of the slab S based on image information sent from the CCD camera 62. For example, it is possible to calculate the camber amount of width reduction portion of the slab S in the width direction of displacement of the conveying line L with the progress of the width reduction of one point of the side surface LF of the slab S. Controller 28, in accordance with the calculated camber amount, of the side surfaces LF of both the slab S during width rolling, the rear end side LFI as the inner circumferential side of the bending of the slab S away from the transfer line center LC changing the angle of incidence θ.
[0065]
　Note that the control unit 28, in addition to the image information of the width reduction portion of the slab S, as in the first embodiment, for example, the width reduction method of the slab, the dimensions of the slab S, the width reduction amount of the slab S, information such as the steel type of the slab S is adapted to be sent. The control device 28, in addition to the image information of the width reduction portion of the slab S, the width reduction method of the slab, the dimensions of the slab S, the width reduction amount of the slab S, based on the steel type of the at least one information of the slab S incident the angle θ may be determined.
[0066]
(Width reduction method)
　will be described next width reduction method of the fourth embodiment. In the width reduction method of this embodiment, a width reduction device 60. In the following, a case will be described in which the width reduction exit side of slab S camber occurs.
[0067]
　First, as shown in FIG. 20, sandwich the heated slab S from both sides by a pair of plate members 24, align the width direction position of the slab center SC in the width direction position of the conveying line center LC (the so-called centering). Thereafter, as shown in FIG. 21, is separated is moved from the slab S to the pair of plate members 24 widthwise outer conveying line L (the side away from the transfer line center LC).
[0068]
　Next, as shown in FIG. 22, scissors again from both sides in the width direction of the slab S in a pair of plate members 24, in this state, the side LFI (FIGS. 23 to 25 of the inner circumferential side of the bending of the slab S the rear end of the upper side surface) imparts the incident angle θ to the slab S away from the transfer line center LC. Incidentally, to the tip of the slab S enters a predetermined amount in the photographing region 62A, for example, information set in advance, the temperature information of the slab S, thickness deviation, and any one of the deviation of the coefficient of friction or the incident angle θ is determined based on information, (details will be described later) is calculated incident angle θ on the basis of the camber amount after the leading end portion of the slab S has entered a predetermined amount into the imaging region 62A.
[0069]
　Next, as shown in FIG. 23, after the width reduction portion of the slab S has entered the imaging region 62A, the control unit 28 based on the image information of the camber quantity of the width reduction portion of the slab S calculate. Thereafter, the control device 28, incidence of the slab S so that the rear end of the side LFI as the inner circumferential side of the bending of the slab S at the width reduction according to the calculated camber quantity and width reduction progress away from the transfer line center LC changing the angle θ. In the present embodiment, as shown in accompanying Figure 24 with the progress of the width reduction of the slab S, and gradually increasing the incident angle theta.
[0070]
　Next, as shown in FIG. 25, the controller 28 reduces the incident angle θ approaching the width reduction of the tail end of the slab S. Then, when the width reduction of the tail end of the slab S is set to be the incident angle θ a value close to zero or zero.
[0071]
　Further, the incident angle theta, in addition to the image information of the width reduction portion of the slab S, the width reduction method of the slab S, the dimensions of the slab S, the width reduction amount of the slab S, the steel grade of at least one information of the slab S it is preferable to change based. In addition to the image information of the width reduction portion of the slab S, it can be further by setting the incident angle θ on the basis of the information about the slabs S, obtaining the incident angle θ of more appropriate slab S.
[0072]
　After the slab S has moved downstream of the conveying line L than the pair of plate members 24, as shown in FIG. 26, the control device 28 is positioned in the width direction of the plate member 24 by operating the moving mechanism 32 together back to the original position, to return the inclination with respect to the transport line center LC of the plate member 24 to the original inclination. Thereafter, as shown in FIG. 26, a pair of plate members 24 enters a standby state in a state of being spaced apart from each other in the width direction of the conveying line L.
[0073]
　Next, the function and effect will be described in the fourth embodiment. As for effects obtained by the same configuration as in the first embodiment will be omitted.
[0074]
　Also the width reduction amount on both sides of the slab S is the same, the camber that occurs, it is because the different ease of deformation at both side portions LP. That is, when the width reduction of the slab S is the thickness from the side surface portion LP of the deformable side side surface portion LP is not easily deformed side is increased, since the increased longitudinal elongation, camber in the width direction to the slab S resulting thickness deviation of.
　In the present embodiment, the trailing edge transfer line center LC side of the inner peripheral side bending of the slab S LFI (side LF upper in FIGS. 21 to 26) in accordance with the camber amount of width reduction portion of the slab S the incident angle θ be applied to the slab S away from. Therefore, depending on the camber of the width reduction portion of the slab S compared to configurations without imparting the incident angle θ to the slab S, of both of the side surface portion LP of the slab S, the side surface becomes the outer peripheral side of the bending LFO It can be appropriately adjusted tensile force FT acting on the side surface portion LPI containing side LFI comprising an inner circumferential side of the bending and compressive forces FC acting on the side surface portion LPO containing (side surface of the lower side in FIGS. 21 to 26). Thus, to adjust the deformability of the inner peripheral side of the side surface portion LPI side portions LPO and bending of the outer peripheral side bending of the slab S, it can be the same deformability. Therefore, the asymmetry in the width direction of the cross-sectional shape of the camber and the slab S of the slab S after undergoing width reduction step (i.e., thickness deviation) can be suppressed.
[0075]
　In the fourth embodiment, determines the angle of incidence θ on the basis of the initial only information other than the camber amount of width reduction, the present disclosure is not limited to this structure. For example, the initial width reduction to the end, may be determined based on the camber quantity and the information other than the camber amount of width reduction portion of the incident angle θ slab S. As the information other than the camber quantity, for example, the temperature distribution of the slab S in the first embodiment, any deviation of the thickness deviation, and coefficient of friction of the slab S in a third embodiment of a slab S of the second embodiment one or more information and the like. In this case, it is possible to obtain the incident angle θ of more appropriate slab S.
[0076]

　Next, a description will be given width reduction method and the width reduction device of the fifth embodiment. The same components in the fourth embodiment are denoted by the same reference numerals, and description thereof is appropriately omitted.
[0077]
(Width reduction device)
　as shown in FIG. 27, the width reduction device 70 of the present embodiment, provided with a CCD camera 72 in the width rolling exit side of slab S as an example of a slab information acquisition means, the width reduction of the slab S except a configuration of determining the incident angle θ of the slab S in accordance with the thickness deviation of both side portions LP in the delivery side, other configuration is the same configuration as the width reduction device 60 of the fourth embodiment.
[0078]
　CCD camera 72, (in other words, the downstream side of the pair of width reduction member 22) the outlet side width reduction of the slab S having a width reduction device 70 are respectively disposed on both widthwise outer conveying line L, the slab S width reduction portion of both side portions LP a is configured to shoot from each side. The image captured by the CCD camera 72 is adapted to be sent to the controller 28.
[0079]
　In the control apparatus 28 of the present embodiment, it calculates the thickness deviation from the maximum thickness portion of the both side portions LP in the width reduction portion of the slab S based on image information from the CCD camera 72. Then, the controller 28 operates the moving mechanism 32, after the side LFB width reduction is a plate thickness in both sides portion LP is thin in the portion side of the slab S (width reduction hardly deformed side in front) end imparts the incident angle θ to the slab S to be separated from the conveyor line center LC.
[0080]
　Next, a description will be given width reduction method of the present embodiment. In the width reduction method of this embodiment, a width reduction device 70.
　The width reduction method of this embodiment, except for the configuration to set the angle of incidence θ in place of the camber quantity of the width reduction exit side of the slab S in thickness deviation of both side portions LP of the slab S, other configurations are the 4 is the same as the width reduction method embodiments. Thus, for the control procedure of the incident angle θ of the slab S by the control unit 28 are the same as FIGS. 21 to 26.
[0081]
　A width reduction step of the present embodiment, the image information control based on device 28 of the slab S acquired from the CCD camera 72 to calculate the thickness deviation of both side portions LP in the width reduction portion of the slab S. Thereafter, the control device 28 the calculated rear side of the plate thickness after the width reduction is thin side of the slab S LFB depending on thickness deviation and width reduction progress of the slab S away from the transfer line center LC changing the angle of incidence θ. In the present embodiment, as shown in accompanying Figure 24 with the progress of the width reduction of the slab S, and gradually increasing the incident angle theta.
[0082]
　Next, as shown in FIG. 25, the controller 28 reduces the incident angle θ approaching the width reduction of the tail end of the slab S. Then, when the width reduction of the tail end of the slab S is set to be the incident angle θ a value close to zero or zero.
[0083]
　Further, the incident angle theta, in addition to the thickness deviation of both side portions LP in the width reduction portion of the slab S, the width reduction method of the slab S, the dimensions of the slab S, the width reduction amount of the slab S, the slab S it is preferable to change according to at least one of the information steels. In addition to the thickness deviation of both side portions LP in the width reduction portion of the slab S, by further setting the incident angle θ on the basis of the information about the slabs S, obtaining the incident angle θ of more appropriate slab S be able to.
[0084]
　After the slab S has moved downstream of the conveying line L than the pair of plate members 24, as shown in FIG. 26, the control device 28 is positioned in the width direction of the plate member 24 by operating the moving mechanism 32 together back to the original position, to return the inclination with respect to the transport line center LC of the plate member 24 to the original inclination. Thereafter, as shown in FIG. 26, a pair of plate members 24 enters a standby state in a state of being spaced apart from each other in the width direction of the conveying line L.
[0085]
　Next, the function and effect will be described in the fifth embodiment. As for effects obtained by the same configuration as the fourth embodiment will be omitted.
[0086]
　In the present embodiment, the both side side surface of the plate thickness after the width reduction is thin side of the slab S LFB depending on thickness deviation of LP (FIG. 27 in the width reduction portion of the slab S, the upper side There, the rear end side) of the right in FIG. 28 imparts the incident angle θ to the slab S away from the transfer line center LC. Therefore, in comparison with the configuration without imparting the incident angle θ to the slab S in accordance with the thickness deviation of both side portions LP in the width reduction portion of the slab S, of the side surface portion LP of both slab S, the width the plate thickness is large side of the side surface LFA after reduction (FIG. 27, a side of the lower side surface of the left side in FIG. 28) a plate thickness after the compression force FC and width reduction acting on the side surface portion LPA containing thin the tensile force FT acting on the side surface portion LPB comprising a side aspect LFB can be appropriately adjusted. Thus, to adjust the side portions LPA and the ease of plate thickness becomes thin in the side of the side surface portion LPB deformation after width reduction of the sheet thickness becomes thicker side of the slab S, be the ease of equivalent variations it can. Therefore, the asymmetry in the width direction of the cross-sectional shape of the camber and the slab S of the slab S after undergoing width reduction step (i.e., thickness deviation) can be suppressed.
[0087]
　In the fifth embodiment, as shown in FIG. 28, it has been calculated thickness deviation of the side surface portion LP of both the slab S in the width rolling exit side based on the image information captured by the CCD camera 72, the present disclosure but it is not limited to this configuration. For example, as shown in FIG. 29, in place of the CCD camera 72, a distance sensor 74 with a plurality spaced apart in the width direction above the conveying line L, and the distance between the upper surface of the slab S to be conveyed measured, may the measured information as configured to calculate the width direction of the plate thickness deviation of the slab S based. Further, as shown in FIG. 30, by moving in the width direction of the conveying line L using a mobile device (not shown) of one of the distance sensors 74, measure the distance between the upper surface of the slab S, the measured information it may be calculated in the width direction of the plate thickness deviation of the slab S in the width rolling exit side based.
[0088]
　In the first to fifth embodiments has a configuration for imparting the incident angle θ to the slab S using the plate member 24, the present disclosure is not limited to this structure. For example, as the width pressurization device 80 shown in FIGS. 31 and 32, are positioned on both sides of the slab S, using a pair of roll members 84 rotatable to the thickness direction of the slab S and axially it may be configured to impart the incident angle θ to the slab S. These roller member 84 is movable in the width direction of the conveying line L by the moving mechanism 82 which is controlled by the control device 28. The case of using the rotatable roller member 84, the moving mechanism 82, since it is not necessary to incline the roller member 84 to the conveying line L, mechanism is simplified. Further, since it turns with respect to the slab S which roller member 84 is transported, the friction between the roller member 84 and the slab S is suppressed.
[0089]
　In the first to fifth embodiments has a configuration that controls the pressing mechanism 30 for moving the pair of width reduction member 22 in the width direction by the control device 28, the present disclosure is not limited to this structure. For example, it may be controlled pushing mechanism 30 in another control device and the control device 28.
[0090]
　Having described several embodiments of the present disclosure, the present disclosure is not limited to the above, it can be implemented in various modifications other than the above within a scope not departing from the gist it is a matter of course that there is. For example, it may be used in any combination configuration of the first to fifth embodiments. That is, the incident angle θ of the slab S, the temperature distribution of the slab S before width reduction, thickness deviation, the deviation of the coefficient of friction, the camber amount of width reduction portion, and, a width reduction portion of the thickness deviation any two or more of information and may be determined by combining the additional information.
[0091]
　Relates above embodiments, the following additional statements are further disclosed.
[0092]
(Supplementary Note 1)
　the incident angle of the slab the slab is disposed on the transport line for a pair of width reduction means to the width reduction of the slab, the information of the slab to be obtained at least one post-width reduction before and width reduction is allowed, the width reduction method changes based on.
[0093]
(Supplementary Note 2)
　to said information includes a temperature distribution in the width direction of the slab before width reduction, depending on the temperature distribution, thereby changing the incident angle of the slab, the width reduction method described in Appendix 1.
[0094]
(Supplementary Note 3)
　to said information includes camber of the slab after width rolling, in accordance with the slab camber, changing the incident angle of the slab, the width reduction method described in Appendix 1.
[0095]
(Supplementary Note 4)
　The above information, includes the width direction of the plate thickness deviation of at least one of the slab after width rolling before and width reduction, according to the thickness deviation, to vary the angle of incidence of the slab, width reduction method described in Appendix 1.
[0096]
(Supplementary Note 5)
　in said information includes deviation coefficient of friction with respect to the width reduction means both widthwise side surfaces of the slab before width reduction, in accordance with the deviation of the friction coefficient, changing the incident angle of the slab let the width reduction method described in Appendix 1.
[0097]
(Supplementary Note 6)
　In addition to the information, the width reduction method of the slab, the dimensions of the slab, the width reduction amount of said slab, based on at least one of the steels of the slab changes the incident angle of the slab, Appendix 2 width reduction method according to any one of 1-5.
[0098]
(Supplementary Note 7)
　upstream of the transfer line than the pair of width reduction means, a movable member which is movable in the width direction of the slab, the incident angle is brought into contact with the width direction of the side surface of said slab changing the width reduction method according to any one of appendices 1-6.
[0099]
(Supplementary Note 8)
arranged on the conveying line of the slab, and a pair of width reduction means for width reduction by pressing the slab from both sides in the width direction of the slab,
　the upstream side of the conveying line than the pair of width reduction means disposed, and slabs incident angle changing means for changing an incident angle of the slab,
　and the slab information obtaining means for obtaining information of at least one of the slab after width rolling before and width reduction,
　is obtained with a slab information acquiring means It was based on the information of the slab, the slab incidence angle controlling means for controlling the slab incident angle changing means,
　the width reduction device comprising a.
[0100]
(Supplementary Note 9)
　The slab information acquisition means includes means for obtaining a temperature distribution in the width direction of the slab before width reduction,
　the slab incidence angle controlling means, depending on the temperature distribution, the slab incident angle changes control means, the width reduction device according to Appendix 8.
[0101]
(Supplementary Note 10)
　said slab information acquisition means includes means for obtaining the camber of the slab after width rolling,
　the slab incidence angle controlling means, depending on the camber of the slab, the slab incident angle changing means controlling the width reduction device according to Appendix 8.
[0102]
(Supplementary Note 11)
　said slab information acquisition means includes means for obtaining a width direction of the plate thickness deviation of at least one of the slab after width rolling before and width reduction,
　the slab incidence angle controlling means, the thickness deviation depending on the size of, for controlling the slab incident angle changing means, the width reduction device according to note 10.
[0103]
(Supplementary Note 12)
　said slab information acquisition means includes means for obtaining a deviation coefficient of friction with respect to the width reduction means both widthwise side surfaces of the slab before width reduction,
　the slab incidence angle controlling means, said friction coefficient in accordance with the deviation, and controls the slab incident angle changing means, the width reduction device according to Appendix 8.
[0104]
(Supplementary Note 13)
　said slab incident angle changing means, located on both sides of the slab, and a roll member of a pair rotatable to axially plate thickness direction of the slab, the roll member width of the slab having a moving means for moving in a direction, the width reduction device according to any one of appendices 8-12.
[0105]
(Supplementary Note 14)
　said slab incident angle changing means, extends toward the pair of the width reduction means, the plate member plate surface in contact with the side surfaces in a width direction of the slab, the plate member in the width direction of the slab having a moving means for moving the width reduction device according to any one of appendices 8-12.

claims
[Claim 1]
　The incident angle of the slab for a pair of width reduction means for width reduction of the slab is disposed on the transport line of the slab, on the basis of the information of the slabs to be acquired at least one post-width reduction before and width reduction change make, width reduction method.
[Claim 2]
　The information may include temperature distribution in the width direction of the slab before width reduction, depending on the temperature distribution, thereby changing the incident angle of the slab, the width reduction method according to claim 1.
[Claim 3]
　Wherein the information includes the camber of the slab after width rolling, in accordance with the slab camber, changing the incident angle of the slab, the width reduction method according to claim 1.
[Claim 4]
　The said information, includes the width direction of the plate thickness deviation of at least one of the slab after width rolling before and width reduction, according to the thickness deviation, to vary the angle of incidence of the slab, to claim 1 width reduction methods described.
[Claim 5]
　The information includes the deviation coefficient of friction with respect to the width reduction means both widthwise side surfaces of the slab before width reduction, in accordance with the deviation of the coefficient of friction, to change the incident angle of the slab, claim width reduction method described in 1.
[Claim 6]
　In addition to the information, the width reduction method of the slab, the dimensions of the slab, the width reduction amount of the slab, the slab steels based on at least one changing the incident angle of the slab, according to claim 2-5 width reduction method according to any one.
[Claim 7]
　Upstream of the transfer line than the pair of width reduction means, a movable member which is movable in the width direction of the slab, the changes the angle of incidence is brought into contact with the width direction of the side surface of the slab, width reduction method according to any one of claims 1 to 6.
[8.]
　Disposed on the conveying line of the slab, and a pair of width reduction means for width reduction by pressing the slab from both sides in the width direction of the slab,
　is arranged on the upstream side of the conveying line than the pair of width reduction means, slab incident angle changing means for changing an incident angle of the slab,
　and the slab information obtaining means for obtaining information of at least one of the slab after width rolling before and width reduction,
　of the slab obtained in the slab information acquiring means based on the information, and slabs incidence angle controlling means for controlling the slab incident angle changing means,
　the width reduction device comprising a.
[Claim 9]
　The slab information obtaining means includes means for obtaining a temperature distribution in the width direction of the slab before width reduction,
　the slab incidence angle controlling means, depending on the temperature distribution, and controls the slab incident angle changing means the width reduction device according to claim 8.
[Claim 10]
　The slab information obtaining means includes means for obtaining the camber of the slab after width rolling,
　the slab incidence angle controlling means, depending on the camber of the slab, to control the slab incident angle changing means, width reduction system according to claim 8.
[Claim 11]
　The slab information obtaining means includes means for obtaining a width direction of the plate thickness deviation of at least one of the slab after width rolling before and width reduction,
　the slab incidence angle controlling means, the magnitude of the thickness deviation in response, controlling the slab incident angle changing means, the width reduction device according to claim 10.
[Claim 12]
　The slab information obtaining means includes means for obtaining a deviation coefficient of friction with respect to the width reduction means both widthwise side surfaces of the slab before width reduction,
　the slab incidence angle controlling means, depending on the deviation of the friction coefficient Te, and controls the slab incident angle changing means, the width reduction device according to claim 8.
[Claim 13]
　The slab incident angle changing means, located on both sides of the slab, and a roll member of a pair rotatable to axially plate thickness direction of the slab, moving the roll member in the width direction of the slab having a moving means, the width reduction device according to any one of claims 8-12.
[Claim 14]
　The slab incident angle changing means, extends toward the pair of the width reduction means, the plate member plate surface in contact with the side surfaces in a width direction of the slab, moving means for moving said plate member in the width direction of the slab the has a width reduction device according to any one of claims 8-12.