WO2007135802A1 - Method and device for aligning widths of preceding and following metal plates and continuous rolling system - Google Patents

Abstract

A method and a device for aligning the widths of preceding and following metal plates in which a curve can be corrected in the vicinity of a joint by reducing width mismatching at the bonding position of the preceding and following metal plates as much as possible. For that purpose, a device (3) for bonding the trailing edge of a preceding sheet bar (9) and the leading edge of a following sheet bar (6) when they are traveling in the pass line direction, first and second curve measuring instruments (20, 21) for detecting curved states at the trailing edge of a preceding sheet bar and the leading edge of a following sheet bar prior to bonding, fourth and fifth longitudinal pair rollers (25, 26) for shifting at least one of the preceding sheet bar and the following sheet bar in the width direction at the bonding position, and a controller (30) performing drive control of the fourth and fifth longitudinal pair rollers to reduce the deviation in the center position in the width direction between the trailing edge of a preceding sheet bar and the leading edge of a following sheet bar at the bonding position based on the detection signals from the first and second curve measuring instruments are provided.

Description

 Specification

 Width and width adjustment method and apparatus for first and second metal plates and continuous rolling equipment

 Technical field

 [0001] The present invention applies the width alignment device and method for leading and trailing metal plates and the width alignment method and device at the time of joining the tail end portion of the preceding metal plate and the tip portion of the trailing metal plate. It relates to continuous rolling equipment.

 Background art

 [0002] For example, in a continuous hot rolling facility, when a metal plate is roughly rolled by a roughing mill and scraped into a coil box, and then rolled out from the coil box and finish-rolled by a finishing mill, The tail end portion of the preceding metal plate rolled out from the coil box and the tip end portion of the subsequent metal plate are joined by a joining device and continuously finish-rolled by a finishing mill to obtain a metal plate having a desired thickness ( Rolled steel sheet). In order to continuously perform finish rolling in this way, it is necessary to join the preceding and succeeding metal plates at a high speed, and various techniques have been proposed in the past.

 [0003] For example, in Patent Document 1, a steel comprising a cutting machine that cuts the rear end portion of the preceding material and the front end portion of the succeeding material, and a joining machine that heats and press-contacts the rear end portion and the front end portion after cutting. In a piece joining apparatus, a device and a method for centering a steel piece by disposing side guide devices for holding and centering a steel piece from both sides on a cutting machine entry / exit side and a joining machine entry / exit side are disclosed. . Also, it is stated that according to the present apparatus and method, since centering can be performed during cutting, heating, and pressure welding, joint failure due to a butt failure such as center misalignment or mouth opening can be reliably prevented. RU

[0004] Also, in Patent Document 2, in an apparatus that abuts and joins the trailing end of the preceding rolled material and the leading end of the following rolled material, the preceding rolled material and the following rolled material are independently set at the center of the rolling facility (pass center). It is disclosed that a hydraulic side guide device to be held in 1) is provided.

[0005] Patent Document 1: Japanese Patent No. 3377924

 Patent Document 2: Japanese Patent No. 2947612

Disclosure of the invention Problems to be solved by the invention

 [0006] By the way, in general, a partial bend may occur near the tail end of the preceding metal plate or the tip end of the succeeding metal plate rolled out from the coil box.

 [0007] However, as disclosed in Patent Document 1 and Patent Document 2 described above, the side guide device bends near the tail end of the preceding metal plate or near the tip of the following metal plate only with the centering function. In some cases, a width shift state occurs at the joint.

 [0008] For example, even if the joining method is a method of completing joining in the shearing process in which the ends of the preceding and succeeding metal plates are overlapped, as shown in FIG. If there is a partial (local) bend near the tail edge of the plate 100A or near the tip of the trailing metal plate 100B (see Fig. 7 (a)), the first to fourth vertical roller pairs 101a of the side guide device ~: When the joining is completed in the shearing process in which the ends of the preceding metal plate 100A and the trailing metal plate 100B are centered by the Old and the ends thereof are overlapped at the joining position (Fig. 7 (b) → Fig. 7 (See (c) of Fig. 7), a width deviation state (see width deviation part i, mouth in Fig. 7 (c)) occurs at the joint. This phenomenon is particularly remarkable when the direction of the partial bending is different as shown in FIG.

[0009] As shown in FIG. 8, in the guide plate pair 103 of the side guide device disposed on the entrance side of the finish rolling mill 102, the width deviation part i and the mouth remain generated. In order to avoid interference with the width deviation part and the mouth when the plates 100A and 100B pass through the joint part, the interval L is set to

 1 There is a problem that it becomes necessary to expand, and it becomes impossible to perform the bending correction function.

 [0010] Further, until the exit side of the finish rolling mill 102 passes through the guide plate pair 103 on the entry side of each rolling mill, the joint portion is formed in the width direction every time the joint portion of the succeeding metal plates 100A and 100B passes. Because you are not restrained, you cannot correct the bend. This state is held until it is scraped off at the exit side of the finish rolling mill 102, and consideration must be given to avoid interference in the width direction with the guide plate pair 103. There was also. In addition, the wound coil has a problem that a large step is left at the joint of the first and second metal plates; LOOA, 100B, and the width deviation state remains.

[0011] The present invention has been made in view of the above circumstances, and is provided at the joining position of the preceding and succeeding metal plates. It is an object of the present invention to provide a leading and trailing metal plate width aligning method and apparatus, and a continuous rolling facility capable of correcting the bending deviation in the vicinity of the joint portion as much as possible.

 Means for solving the problem

[0012] In order to achieve the above object, according to the present invention, a width aligning method for a preceding metal plate and a trailing metal plate is joined to each other in the pass line direction. Prior to this, at least one of the preceding metal plate and the succeeding metal plate is reduced so as to reduce the deviation of the center position in the width direction at the joining position of the rear end portion of the preceding metal plate and the leading end portion of the following metal plate. It is characterized by shifting in the width direction.

[0013] The amount of shift in the width direction is detected by detecting the bent state of the rear end portion of the preceding metal plate or the front end portion of the subsequent metal plate, and the shift amount of the center position in the width direction at the joining position is detected from the detection result. It is the amount of movement obtained in order to obtain and adjust to reduce the deviation of the center position in the width direction based on this deviation amount.

[0014] Further, when shifting in the width direction, the full length portion of the preceding metal plate advances substantially at the same position while bending near the rear end portion, or the full length portion of the succeeding metal plate advances at substantially the same position. It is characterized by bending near the tip.

[0015] The amount of bending is within the range of elastic deformation of the preceding metal plate or the succeeding metal plate.

 [0016] Further, in the joining, a method is used in which joining is performed in a cutting process in which the ends of the preceding and succeeding metal plates are overlapped.

 [0017] When shifting in the width direction, a first vertical roller is disposed in front of the joining position, and a second vertical roller is disposed at the anti-joining position of the first vertical roller, and the second The vertical roller determines the width position of the full length part, and the first vertical roller reduces the deviation of the center position in the width direction of the joining position of the rear end part of the preceding metal plate and the front end part of the rear metal plate. As described above, the second vertical roller is shifted in the width direction.

 [0018] In order to achieve the above object, a width aligning device for leading and trailing metal plates according to the present invention includes:

 A joining device for joining the rear end portion of the preceding metal plate and the front end portion of the succeeding metal plate under the progress in the pass line direction;

Prior to the joining, the leading end of the preceding metal plate or the trailing metal plate is bent. A bending detection device for detecting a state;

 A side guide device that shifts at least one of the preceding metal plate and the following metal plate in the width direction at the joining position;

 Based on the detection signal from the bend detection device, the side guide device is driven and controlled so as to reduce the shift of the center position in the width direction between the rear end portion of the preceding metal plate and the front end portion of the subsequent metal plate at the joining position. A control device;

 It is provided with.

 [0019] In order to achieve the above object, a continuous rolling facility according to the present invention includes a finishing mill and a downcoiler that are configured by a rough mill, a coil box, a joining device, and a plurality of rolling mills sequentially from the upstream side in the pass line direction. And a width aligning device for the front and rear metal plates is interposed between the coil box and the finishing mill.

 The invention's effect

 [0020] According to the present invention, when the leading and trailing metal plates are joined, the shift in the center position in the width direction at the joining position of the trailing end portion of the preceding metal plate and the leading end portion of the succeeding metal plate is reduced. As described above, since at least one of the preceding metal plate and the succeeding metal plate is shifted in the width direction, it is possible to reduce the width deviation at the joining position of the preceding and succeeding metal plates as much as possible.

 [0021] As described above, the width deviation at the time of joining caused by the bending existing at the rear end portion of the preceding metal plate or the front end portion of the succeeding metal plate is made as small as possible. The side guide device makes it possible to correct the bend, and finish rolling is possible while reducing the bend of the entire length including the joining position.

 Brief Description of Drawings

 FIG. 1 is a schematic side view of a continuous (hot) rolling facility showing an embodiment of the present invention.

 FIG. 2 is also a plan view.

 FIG. 3 is a front view of a pair of vertical rollers.

 FIG. 4 is also a control block diagram.

 FIG. 5 is an explanatory view of the action during joining.

 FIG. 6 is an explanatory view of the action when the joint passes through the plate-like side guide.

FIG. 7 is an explanatory diagram of the action during joining, showing a conventional defect. FIG. 8 is an explanatory diagram of an action when passing through a joint in a plate-like side guide showing a conventional defect.

 Explanation of symbols

 [0023] 1 Coarse rolling mill (coarse mill), 2 Coil box, 3 Joiner, 4 Finish rolling mill (Finish mill), 5 Downcoiler, 6 Subsequent metal plate (following sheet bar), 7 Crop shear, 8 Stack Equipment, 9 Leading metal plate (leading sheet bar), 10 Joiner, 11 Sheet bar, 12 Crop processing equipment, 15 Crop shear, 16 Edge heater, 17 Bar heater, 18 Descaler, 20 First bending measuring instrument, 21 2 bending measuring instruments, 22 1st vertical roller pair, 23 2nd vertical roller pair, 24 3rd vertical roller pair, 25 4th vertical roller pair, 26 5th vertical roller pair, 27 6th vertical roller pair, 22a, 22b ˜27a, 27b 1st to 6th vertical roller pair drive device, 28 guide blade pair, 28a, 28b guide plate pair drive device, 30 control device.

 BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the width and width adjusting method and apparatus for the preceding and following metal plates and the continuous rolling equipment according to the present invention will be described in detail with reference to the drawings by way of examples.

 Example

 FIG. 1 is a schematic side view of a continuous (hot) rolling facility showing an embodiment of the present invention, FIG. 2 is also a plan view, FIG. 3 is a front view of a pair of vertical rollers, and FIG. FIG. 5 is a control block diagram, FIG. 5 is an explanatory diagram of the action at the time of joining, and FIG.

 [0026] As shown in Figs. 1 and 2, the continuous (hot) rolling equipment of this example is composed of a rough rolling machine (coarse mill) 1, a coil box 2, a joining device 3, and a plurality of stands from the upstream side. A finishing mill (finishing mill) 4 and a down coiler 5 constituted by a rolling mill are provided.

[0027] The succeeding metal plate (following sheet bar) 6 roughly rolled in the rough mill 1 is scraped by the coil box 2 coiler, and the difference in travel speed between the rough mill 1 and the finishing mill 4 is adjusted. The The leading end of the succeeding sheet bar 6 squeezed out from the coiler of the coil box 2 (the crop is cut by the crop shear 7 if necessary) is connected to the leading metal plate (leading sheet) by the overlapping device 8 of the joining device 3. Bar) Overlaid on the rear end of 9 (the crop is cut by crop shear 7 if necessary). [0028] The leading end of the trailing sheet bar 6 and the trailing end of the preceding sheet bar 9 are joined by the joining machine 10 of the joining device 3, and the crop at the joined portion is cut by the crop processing device 12. The sheet bar 11 joined by the joining device 3 and brought into a continuous state is sent to the finishing mill 4.

 [0029] The joining device 3 is configured to join the rear end portion of the preceding seat bar 9 and the front end portion of the succeeding seat bar 6 while traveling, and is a short-time joining device capable of joining in a short time. . In order to perform joining during traveling, a configuration in which the joining machine 10 moves following the traveling of the seat bar or a configuration in which the joining machine 10 swings following the traveling of the seat bar can be applied. is there.

 [0030] For example, the joining machine 10 of the joining device 3 in the present embodiment sandwiches the overlapping portion of the rear end portion of the preceding sheet bar 9 and the front end portion of the succeeding seat bar 6 and pushes them from both sides for shearing. The joining mechanism has a pair of shearing blades to be joined.

 [0031] The sheet bar 11 sent to the finishing mill 4 is successively hot-rolled by a plurality of stand mills and finish-rolled to a desired thickness, and the sheet bar 11 exiting the finishing mill 4 is fed to the down coiler 5. Be taken away. Here, a split shear (not shown) is installed in front of the down coiler 5, and the sheet bar 11 joined in front of the finishing mill 4 is scraped by the down coiler 5 while being split by the split shear. Yes.

 [0032] In the figure, 15 is a crop shear provided on the entrance side of the finishing mill 4, 16 is an edge heater disposed upstream of the pass line of the crop shear 15, and 17 is downstream of the pass line of the edge heater 16. A bar heater 18 disposed close to the side, and a descaler 18 disposed close to the upstream side of the pass line of the joining device 3.

 [0033] The arrangement of the crop shear 15, the edge heater 16, the bar heater 17 and the descaler 18 is appropriately selected depending on the situation of the continuous (hot) rolling facility, and the arrangement position and arrangement are not limited. Presence / absence or the like is not limited to the illustrated example.

[0034] In the present embodiment, the first bending force measuring device (curving force S) that detects the bending (state) at the leading end of the succeeding seat bar 6 close to the downstream side of the pass line of the crop shear 7 is detected. The second bending force measuring device (bending detecting device) 21 for detecting the bending (state) at the rear end portion of the bending detecting device 20 and the preceding seat bar 9 is arranged. The first bend measuring instrument 20 and the second bend measuring instrument 21 are, for example, CCD cameras, and their image signals are sent to a control device 30 described later. still Needless to say, when detecting the bending at the leading end of the trailing seat bar 6 and the trailing end of the preceding seat bar 9, it is possible to use a single bending measuring instrument.

 [0035] In addition, the first and second vertical rows as side guide devices are located close to the upstream side of the pass line of the first bending measuring instrument 20 (located in the upstream side of the pass line of the crop shear 7 in the illustrated example). La pairs 22, 23 are spaced apart by a predetermined distance. The first and second vertical roller pairs 22 and 23 are used for centering the succeeding sheet bar 6 in order to measure the bend at the leading end of the succeeding sheet bar 6 by the first bend measuring instrument 20.

 [0036] Further, the side guide device is located close to the downstream side of the pass line of the second bending measuring instrument 21, that is, upstream of the pass line of the joining device 3 (in the illustrated example, sandwiching the descaler 18). The third and fourth vertical roller pairs 24, 25 (the third vertical roller pair 24 corresponds to the second vertical roller of claim 6, and the fourth vertical roller pair 25 corresponds to the first vertical roller of claim 6. (Corresponding to rollers) are arranged at a predetermined interval. The third and fourth vertical roller pairs 24 and 25 center the leading sheet bar 9 in order to measure the bending at the trailing end of the leading sheet bar 9 with the second bending measuring instrument 21, and at the time of joining The row sheet bar 6 is movable so as to reduce the bending at the front end.

 [0037] Further, the fifth and sixth longitudinal roller pairs 26, 27 (fifth fifth) are located on the downstream side of the pass line of the joining device 3 (in the illustrated example, sandwiching the crop processing device 12) as side guide devices. The vertical roller pair 26 corresponds to the first vertical roller of claim 6 and the sixth vertical roller pair 27 corresponds to the second vertical roller of claim 6). The fifth and sixth vertical roller pairs 26, 27 are movable so as to reduce bending at the rear end portion of the preceding sheet bar 9 at the time of joining.

[0038] As shown in Fig. 3, the first to sixth vertical roller pairs 22 to 27 are orthogonal to the pass line by a pair of left and right first to sixth vertical roller pairs driving devices 22a, 22b to 27a, 27b. It is movable in the direction, that is, the width direction of the seat bar. The fourth and fifth vertical roller pair drive devices 25a, 25b, 26a, and 26b can operate independently on the left and right sides in the figure, and the other vertical roller pair drive devices 22a, 22b to 24a, 24b, 27a and 27b are movable in the closing direction or the opening direction in synchronization with the left and right ones in the figure. These vertical rollers Similarly to the 4th and 5th vertical roller pair drive devices 25a, 25b, 26a, 26b, the pair drive devices 22a, 22b to 24a, 24b, 27a, 27b are configured so that the left and right ones in the figure can operate independently. It goes without saying that it is good.

 [0039] The pair of left and right first to sixth vertical roller pair driving devices 22a, 22b to 27a, 27b are, for example, hydraulic cylinders, and their expansion and contraction operations are driven and controlled by a control device 30 described later.

 In FIG. 1 and FIG. 2, reference numeral 28 denotes a pair of guide plates as side guide devices arranged on the entry side of the finishing mill 4, and the guide plate pair drive devices 28a and 28b (see FIG. 4) are also included. Drive control is performed by a control device 30 described later.

 As shown in FIG. 4, for example, an image signal is input to the control device 30 from the first and second bending measuring devices 20 and 21. Based on these input signals such as image signals, the left and right pair of first to sixth vertical roller pair driving devices 22a, 22b to 27a, 27b and guide plate pair driving devices 28a, 28b are driven and controlled.

 [0042] Specifically, prior to joining, the first and second vertical roller pair driving devices 22a, 22b, 23a, 23b are driven, and the first and second vertical roller pairs 22, 23 drive the trailing sheet bar. With the tip of 6 centered, the first bending measuring instrument 20 detects and measures the bending state of the trailing seat bar 6. Further, the third and fourth vertical roller pair driving devices 24a, 24b, 25a, 25b are driven, and the rear end portion of the preceding sheet bar 9 is centered by the third and fourth vertical roller pairs 24, 25. The second bending measuring device 21 detects and measures the bending (state) at the rear end of the preceding sheet bar 9. The measurement includes, for example, a method in which the center position is obtained from both width end positions by measuring both width end positions.

 That is, for example, image signals input from the first and second bending measuring devices 20 and 21 are image-processed, and the bending (state) at the leading end of the succeeding seat bar 6 and the preceding seat bar 9 are followed. It detects and measures the bend (state) at the edge. Based on the measurement results, the displacements δ and δ at the center position in the width direction at the joint position (see the alternate long and short dash line along the pass line direction) are calculated (see Fig. 5 (a)).

 f P

 [0044] Next, in order to adjust the deviation amounts δ and δ of the center in the width direction to be small, f P

After calculating the amount of movement of the 4th and 5th vertical roller pairs 25 and 26 (the 3rd and 6th vertical roller pairs 24 and 27 are fixed at the centered position), the 4th and 5th vertical rollers correspondingly Pair drive Stroke the devices 25a, 25b, 26a, 26b in the opposite direction (see the arrows in Fig. 5 (b)) to shift the leading end of the trailing seat bar 6 and the trailing end of the leading seat bar 9 in the width direction. At this time, it is possible to adjust so that the shift amounts δ, δ of the center position in the width direction are reduced by moving only one of the fourth and fifth vertical roller pairs 25, 26. Needless to say.

 f p

 [0045] Thereafter, the joining device 10 of the joining device 3 is joined while being sheared by pressing from both sides of the overlapping portion of the rear end portion of the preceding sheet bar 9 and the front end portion of the succeeding sheet bar 6. It is. At this time, as shown in Fig. 5 (c), the joints are joined without any width misalignment (see Fig. 7 (c) b).

 In addition, as shown in FIG. 6, the control device 30 drives and controls the guide plate pair drive devices 28a and 28b, and appropriately controls the interval between the guide plate pair 28, for example, the interval shown in FIG. 6 (a). Control to L

 2 can suppress the meandering of the joined sheet bar 11 and correct the bending force ^. On the other hand, by controlling the interval L in FIG.

 Three

 Can be controlled. That is, between the interval L in FIG. 8 and the intervals L 1 and L in FIG.

 1 2 3 1

L, L can be a force s. This is because, as described above, there is a width shift state at the joint.

twenty three

 This is possible because it has not occurred.

Thus, in this embodiment, in the continuous (hot) rolling facility, the leading end portion of the succeeding sheet bar 6 and the trailing end portion of the preceding sheet bar 9 are viewed from both sides with the overlapping portion therebetween. When joining by pushing and shearing, the bending (state) at the leading end of the trailing seat bar 6 and the bending (state) at the trailing end of the preceding seat bar 9 are detected and measured, and the joining position is determined from the measurement results. The amount of deviation δ, 5 of the center position in the width direction is calculated and the deviation fp

 Movement of the fourth and fifth longitudinal roller pairs 25 and 26 to adjust the amount δ and δ to be small f P

 Since the amount is calculated and the leading end of the succeeding seat bar 6 and the trailing end of the preceding seat bar 9 are shifted in the width direction in a reciprocal manner, the joining position of the preceding and succeeding seat bars 9, 6 The width deviation at can be reduced as much as possible.

[0048] When the leading end portion of the trailing seat bar 6 and the trailing end portion of the preceding seat bar 9 are reciprocally shifted (bent) in the width direction, the shift amount (bending amount) is the elastic deformation of the seat bar. It is preferable to be within the range. If the elastic deformation range is exceeded, permanent deformation remains in the width direction, and the position in the width direction between the fourth and fifth vertical roller pairs 25, 26 and the joining position changes every moment. It is difficult to secure a desired position in the width direction at the position.

 [0049] As described above, the width deviation at the time of joining due to the bending existing at the leading end portion of the succeeding seat bar 6 or the trailing end portion of the preceding seat bar 9 is made as small as possible. It becomes possible to correct the bend, and it is possible to perform a finish rolling with less force in the entire length including the joining position. Even when the sheet bar 11 is passed through the finishing mill 4 on the exit side, there is no bending, which is good. In addition, even in the coiled shape, there is an effect that there is no large step at the joint.

 [0050] Further, when the joint portion passes through the finishing mill 4, the center position in the width direction of the rear end portion of the preceding seat bar 9 and the front end portion of the succeeding seat bar 6 is the same as that of the substantially full length portion (general portion). It is possible to pass through the position, and there is an advantage that rolling is stabilized.

 [0051] Further, if the deviation of the center position can be reduced, the setting method of the side guide device on the entrance side of each rolling mill of the finishing mill 4 can be eliminated, so that the setting method can be easily performed. Become.

 [0052] It should be noted that such a width aligning apparatus and method, in the case of the butt-joining method, is used for the rear end portion of the preceding sheet bar or the front end portion of the succeeding sheet bar before joining by a cutting machine (cut pusher). It is necessary to reproduce the cut state at the time of joining, and it is difficult to move it so as to reduce the curvature S at the time of joining as in this device and method. In a joining method that does not directly use the leading end surface of the succeeding seat bar or the trailing end surface of the preceding seat bar, such as overlapping and joining, this adjustment can be realized with realistic equipment and is an effective means. In addition, when the joining method is a method in which the joining process is completed by overlapping and joining, the cutting by the cutting machine (crop shear) before joining may not be necessary. If it is not a butt, the above-mentioned bending can be reduced regardless of the presence or absence of cutting with a cutting machine (crop shear). Industrial applicability

[0053] The method and apparatus for aligning the width of the preceding and succeeding metal plates and the continuous rolling facility according to the present invention are particularly suitable when employed in a hot rolling line.

Claims

The scope of the claims  [1] Prior to joining the trailing edge of the preceding metal plate and the leading edge of the trailing metal plate in the direction of the pass line direction, the trailing edge of the leading metal plate and the leading edge of the trailing metal plate A width aligning method for the leading and trailing metal plates, wherein at least one of the preceding metal plate and the trailing metal plate is shifted in the width direction so as to reduce the shift of the center position in the width direction at the joining position.  [2] The amount of displacement in the width direction is detected by detecting the bent state of the rear end portion of the preceding metal plate or the front end portion of the subsequent metal plate. 2. The method for aligning the width of the leading and trailing metal plates according to claim 1, wherein the amount of movement is obtained in order to obtain and adjust so as to reduce the deviation of the center position in the width direction based on the deviation amount.  [3] When shifting in the width direction, the full length portion of the preceding metal plate is bent in the vicinity of the rear end while advancing substantially the same position, or the full length portion of the succeeding metal plate is advanced in the substantially same position to move the front end portion The method for aligning the widths of the front and rear metal plates according to claim 1, characterized in that the portions are bent near each other.  4. The method according to claim 3, wherein the amount of bending is within the range of elastic deformation of the preceding metal plate or the following metal plate.  [5] The preceding and following metals according to claim 1, wherein the joining is performed in a shearing process in which the end portions of the preceding and succeeding metal plates are overlapped in the joining. Board width alignment method.  [6] When shifting in the width direction, a first vertical roller is disposed in front of the joining position, and a second vertical roller is disposed at the anti-joining position of the first vertical roller, so that the second longitudinal roller is disposed. The roller determines the width position of the entire length, and the first vertical roller reduces the deviation of the center position in the width direction of the joining position of the rear end of the preceding metal plate and the front end of the subsequent metal plate. 2. The method for aligning the width of the front and rear metal plates according to claim 1, wherein the width is shifted in the width direction with respect to the second vertical roller.  [7] a joining device that joins the rear end of the preceding metal plate and the front end of the following metal plate in the direction of the pass line; Prior to the joining, a bending detection device for detecting the bending state of the rear end of the preceding metal plate or the front end of the subsequent metal plate; A side guide device that shifts at least one of the preceding metal plate and the following metal plate in the width direction at the joining position;  Based on the detection signal from the bend detection device, the side guide device is driven and controlled so as to reduce the shift of the center position in the width direction between the rear end portion of the preceding metal plate and the front end portion of the subsequent metal plate at the joining position. A control device;  A width aligning device for leading and trailing metal plates.  A rough mill, a coil box, a joining device, a finishing mill composed of a multi-stand rolling mill, and a downcoiler are provided in order from the upstream side in the pass line direction. Between the coil bots and the finishing mill, A continuous rolling facility characterized in that the apparatus for aligning the width of the leading and trailing metal plates according to claim 7 is provided.