JPH04319005A - Continuous hot sheet rolling equipment and device for straightening tip bend of rolled stock - Google Patents

Abstract

PURPOSE:To embody a straight joint by straightening bends at the tip and rear end of a bar material when the bar materials are joined and continuously rolled in a continuous hot sheet rolling equipment. CONSTITUTION:A tip bend straightening device 3, crop shear 4 and joining machine 6 are arranged in that order between a roughing mill 1 and a finishing mill line 6. The amount of bend at the tip of rolled stock is detected with a bend detector 2 and bend straightening corresponding to the amount of bend is executed with tip bend straightening device 3 by plane bending system.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to rolling equipment for manufacturing hot thin plates, and in particular, after correcting the bending of the tip of a bar material after rough rolling, crops at the leading and trailing ends are cut to straighten the joint surface. The present invention relates to continuous hot thin plate rolling equipment and leading and trailing edge bending straightening equipment for aligning and joining the rear end of a preceding material and the leading end of a succeeding material and continuously rolling a hot thin sheet in a finishing rolling mill.

0002

2. Description of the Related Art Hot thin plates are manufactured by rolling a slab material having a thickness of around 250 mm using a rough rolling mill to reduce the thickness of the slab material to an intermediate material called a bar material having a thickness of 20 to 40 mm. However, the tip of this bar material is often bent. When this bent tip is supplied to the next finishing rolling mill row with six to seven rolling mills, the bending of the tip is further amplified, increasing the bending of the product and lowering the yield. In addition, when the bar material has a large end edge, there is a problem in that the end throttling accident occurs in the finishing rolling mill row.

[0003] Conventionally, as for controlling the posture or bending of a rolled material in a hot rolling facility, for example, as described in Japanese Patent Application Laid-Open No. 61-222626, there has been a method based on the image of deviation from the centering position of a slab during conveyance. There is a method of measuring with a sensor and centering the slab using a cylinder device without stopping based on the measured value, and a method that uses a level adjustment device and a side sizing device before and after the width sizing press, as described in Japanese Patent Application Laid-open No. 134108/1983. By arranging the guide device and reciprocating the side guide device in the same direction as the rolling direction of the width sizing press, the position and posture of the hot material relative to the width sizing press is stabilized.
There are ways to prevent bending of hot materials. however,
No effective method has been found to correct the bending of the tip of the bar material.

[0004] Recently, for example, Japanese Patent Application Laid-Open No. 1126-1983
As described in Japanese Patent No. 01, a method has been proposed in which the trailing end of the preceding bar material and the leading end of the trailing material are joined together and continuously rolled in a row of finishing mills.

[0005] If continuous rolling becomes possible, great effects such as energy saving, yield improvement, labor saving, etc. can be expected. When joining, the front and rear ends of the bar material are cut with a crop shear, but if the tip of the bar material is bent at this time, it will be joined with the bend, so this part will be passed through the finish rolling mill line as is. The yield decreases because the rolling is expanded. Furthermore, it causes misrolling. If the amount of crop cut is increased to eliminate bending, the problem of sheet passability will be solved, but there is a problem that the yield will further decrease.

[0006]

[Problems to be Solved by the Invention] As described above, in the prior art, no consideration is given to straightening the bending of the front and rear ends of the bar material, and the bar material is supplied to the finishing rolling mill with the leading end bent. As a result, there are problems such as a decrease in yield and the occurrence of accidents due to tip drawing, especially in continuous hot thin sheets that are continuously rolled in finishing mill rows by joining the rear end of the leading bar material to the leading end of the trailing bar material. In rolling equipment, since the parts are joined while still being curved, this part is rolled and expanded as it is in the finish rolling mill row, which reduces yield and causes misrolling.

An object of the present invention is to solve the above-mentioned problems and to provide a continuous hot thin plate rolling equipment and a tip bending straightening device which have excellent yield and threadability by correcting the bending of the leading and trailing ends of the rolled material during rolling. It is about providing.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention involves joining the trailing end of the leading material and the leading end of the trailing material after rolling in a rough rolling mill, and continuously rolling them in a finishing rolling mill row. In a continuous hot thin plate rolling facility that produces hot thin plates by rolling, a tip bend straightening device is provided between a rough rolling mill and a finishing rolling mill row to correct tip bending of a bar material rolled by the rough rolling mill; A crop shear for crop-cutting the bar material whose tip has been straightened, and a joining device for joining the rear end of the preceding material and the tip of the succeeding material of the bar material which have been crop-cut are arranged in this order. be.

The present invention also provides at least one pair of support rollers that support the rolled material, a pair of fulcrum rollers that provide a fulcrum for the bending force in the width direction of the rolled material that acts on the tip of the rolled material; Applying a bending force in the width direction of the rolled material to the tip of the rolled material to correct the bending of the tip of the rolled material by plane bending 1
A tip straightening device for a rolled material, comprising: a pair of bending force applying rollers; and at least one pinch roller, which is arranged near the fulcrum roller and prevents the rolled material from lifting when the bending force is applied. It provides:

[0010] Here, the pinch rollers include at least three pinch rollers, one between the pair of fulcrum rollers and one each on the front and rear thereof.
It is preferable to install the pinch roller permanently, and it is also preferable to install at least one pinch roller on the entrance side of the bending force applying roller.

[0011] Furthermore, it is preferable to provide driving means for driving each of the support roller, fulcrum roller, and bending force applying roller in synchronization with the speed of the table roller.

Furthermore, a common frame for supporting the fulcrum roller and the pinch roller, and a driving means for moving this frame in the cross direction of the rolled material are provided. Preferably, the fulcrum roller and the pinch roller are moved together.

In order to achieve the above object, the present invention also provides at least one pair of support rollers that support the rolled material, and a pair of fulcrum rollers that provide a fulcrum for the bending force acting on the tip of the rolled material. , a pair of bending force applying rollers that apply the bending force to the tip of the rolled material to correct the bending of the tip of the rolled material, a plate bending detector installed on the upstream side of the support roller, and this plate bending detector. and control means for controlling the moving direction, moving amount, and moving timing of the support roller, fulcrum roller, and bending force applying roller based on the detected amount of plate bending detected by the method. be.

[0014] Furthermore, the present invention manufactures a hot thin plate by joining the trailing end of the leading material and the leading end of the trailing material after being rolled in a rough rolling mill using a joining machine, and rolling them continuously in a row of finishing mills. In continuous hot thin plate rolling equipment, a plate bending detector, a tip bending straightening device, and a crop shear are arranged in this order between a rough rolling mill and a joining machine, and the detected amount of plate bending detected by the plate bending detector is controlling the tip decurvature correction device, and
A control means is provided for calculating the optimum cutting position of the leading and trailing end crop after straightening the bending of the leading and trailing ends of the rolled material based on the shape data of the leading and trailing ends of the rolled material detected by the plate bending detector, and driving the crop shear. be.

[0015]

[Operation] By arranging the tip bend straightening device, crop shear, and joining device in this order between the rough rolling mill and the finishing rolling mill row, the tip bend is corrected before joining the rolled materials.
Since crop cutting is carried out, it becomes possible to form straight joints with aligned joint surfaces, ensuring good sheet threadability in the finishing mill row and improving yield.

[0016] Further, the tip bending straightening device is of a plane bending straightening type consisting of a support roller, a fulcrum roller, and a bending force applying roller, and at least one pinch roller is provided near the fulcrum roller to prevent the rolled material from lifting. This arrangement prevents the bar material from buckling and lifting when a bending force is applied, and allows accurate bending correction.

Furthermore, by providing a driving means for driving each roller in synchronization with the speed of the table roller, these rolls can be arranged without interfering with the conveyance of the rolled material, and bending can be straightened while conveying the rolled material. Therefore, the temperature drop in the rolled material can be reduced.

Furthermore, by moving the other fulcrum roller and the pinch roller together when one fulcrum roller moves to the fulcrum position, the bending action of the rolled material can be avoided near the fulcrum roller regardless of the width of the plate. The compressed side is pinched and lifting can be effectively prevented.

Further, a plate bending detector is installed on the upstream side of the support roller, and depending on the detected amount, the support roller,
By controlling the movement direction, movement amount, and movement timing of the fulcrum roller and the bending force applying roller, simple and accurate bending correction can be performed.

Furthermore, when detecting the amount of bending with the plate bending detector, the shape of the leading and trailing edges can also be measured, so the optimal crop cut position can be calculated based on the shape data, and by controlling the crop shear, the position suitable for joining can be determined. You can make a crop cut with , eliminating crop miscuts.

Although only the correction of the curvature at the leading end has been described above, it is of course possible to correct both the curvature at the leading end and the curvature at the rear end.

[0022]

[Embodiments] Hereinafter, embodiments of the present invention will be explained with reference to FIGS. 1 to 11. Figure 1 shows the overall layout of the main equipment of a continuous hot thin plate rolling facility.The bar material rolled from a slab in a rough rolling mill 1 is detected by a plate bending detector 2 to detect its tip shape, bending amount, etc. Based on the data, the bend of the bar material is corrected by the tip bend straightening device 3, the tip is crop cut by the crop shear 4, passed through the joining machine 5, conveyed and rolled by the finishing mill row 6, and then transferred to the down coiler 8. Start rolling. Similarly, the rear end of the bar material is also crop-cutted by the crop shear 4 and conveyed to the joining machine 5. During this time, the next slab is rolled in the rough rolling mill 1, and the tip of the next bar material is detected by the detector 2.
, the leading edge straightening device 3 and the crop shear 4 pass through the same process as the preceding material and arrive at the joining machine 5, and the trailing end of the leading material and the leading end of the trailing material move in synchronization with the conveyance speed of the bar material. It is joined at 5. The joined leading material and trailing material are continuously rolled by a finishing mill row 6, cut by a dividing shear 7,
The leading material is wound up with down coiler 8, and the trailing material is wound up with another one.
It is wound up with two down coilers 8A. This operation is continuously repeated, and the hot thin plate is continuously rolled in the finish rolling mill row 6.

Next, the relationship between the bending of the leading and trailing ends and the joining will be explained with reference to FIG. In FIG. 2, (a) shows the unbent rear end of the leading material and the leading end of the trailing material, and the shaded area shows the region to be crop-cut. With such bar materials, the joint surfaces are aligned as shown in (b), and straight bar materials can be joined. However, if the tip of the trailing material is bent as shown in (c), the crop is cut at right angles to the direction of movement of the bar material, so the joint surface as shown in (d) is They are joined in a shifted state and rolled in this state in the finish rolling mill row 6, which poses problems in terms of sheet threadability and yield. In this embodiment, in order to solve this problem, the rough rolling mill 1
After correcting the tip bending of the bar material after rough rolling by disposing the tip bending correction device 3 between the bar material and the crop shear 4,
Cut the front and rear ends of the crop as shown in a), and
The rear end of the preceding material and the leading end of the succeeding material are joined in the aligned state as shown in b), and the hot thin plate is continuously rolled in the finishing mill row 6.

The principle of straightening the bending of the distal end bending device 3 of this embodiment will be explained with reference to FIG. In FIG. 3, reference numeral 9 denotes a bar material having a bent tip with a bending amount δ, and a support roller 10, a fulcrum roller 11, and a bending force applying roller 12 are connected to the bar material 9 at predetermined intervals of L1 and L2, respectively. Sandwich the material 9 and place it on both sides. Immediately after the tip of the bar material 9 passes the bending force imparting roller 12, the bending force imparting roller 12 located on the bending side of the tip of the bar material is moved to the position indicated by the two-dot chain line.
A planar bending force P is applied to the bar material 9 using the bar material 9 as a fulcrum while being supported by the support roller 10 on the same side as the bending force applying roller 12 in operation. As a result, the shaded area a on the side of the roller 11 serving as a fulcrum is compressed, and the shaded area b on the opposite side is expanded, thereby correcting the reverse bending of the bar material 9 as shown by the two-dot chain line. At this time, since the bar material 9 is being conveyed on the table rollers, the bar material tends to buckle due to compressive force at the shaded area a, and tends to lift upward at the bending force applying roller 12. Therefore, in order to prevent this, a pinch roller is provided in this embodiment.

Next, a system configuration including the tip decurvature correction device 3 will be explained with reference to FIG. In FIG. 4, only one side of the support roller 10, fulcrum roller 11, and bending force applying roller 12 of the tip bend correction device 3 is shown, and illustration of the other side is omitted. The tip bending correction device 3 includes three pairs of support rollers 10, and a pair of fulcrum rollers 11 and a bending force applying roller 12, respectively. Three pinch rollers 19 are installed, and a bending force applying roller 12
A pinch roller 20 is also installed on the inlet side of the bar to prevent the bar material from lifting up. Note that the pinch rollers 19 around the fulcrum roller 11 are connected to the two fulcrum rollers 1.
The central pinch roller 19 sandwiched between the rollers 1 and 1 is most effective in preventing lifting due to buckling, and therefore,
Only this one pinch roller may be arranged, or three or more pinch rollers may be arranged as necessary.

On the entrance side of the support roller 10, the above-mentioned plate bending detector 2 and a speed meter 14 for detecting the conveyance speed of the table roller 13 are arranged. The plate bending detector 2 detects the position in the width direction of the bar material 9 at intervals of ΔL pitch from the tip end of the bar material 9 that is conveyed on the table roller 13 in the direction of the arrow, and uses the speedometer 15 to transmit the detected data. The computer 15 along with the detected transport speed of the table roller 13
By inputting these data into the shape shown in FIG. 5 and calculating the shape shown in FIG. 5, the plate width W and the bending amount δmax from the tip to the point L1 are recognized as the maximum bending amount. Processing data is C
The image is processed and displayed on the RT 16, and printed out using the printer 17 if necessary. Further, processing data is inputted from the computer 15 to the control device 18, which controls the moving direction, moving amount, and moving timing of the support roller 10, the fulcrum roller 11, and the bending force applying roller 12. The details of this control will be explained below in detail with reference to FIGS. 6 to 8.

The support roller 10 is located at the position indicated by the two-dot chain line in FIG.
Move to the location and wait. Here, if α is the margin value when the tip passes through the curved portion, h1 = δmax + α. After the bent end passes, it moves a distance h1 and comes into contact with the width end of the bar material 9. The fulcrum roller 11 is at the position shown by the two-dot chain line in FIG.
The aircraft departs at a distance of h2 = α from the board width end, and after passing, moves by h2, that is, α, to the position indicated by the solid line. After this movement is completed, the pinch roller 19 descends and pinches the bar material 9.

The bending force applying roller 12 retires from the position shown by the two-dot chain line in FIG.
Move a distance α, then immediately retreat. here,
ho is a calculated value,

[0029]

[Equation 1]ho = 2(L1 ・δmax-S)/L1
However, S=Σδ・ΔL In other words, for each pitch ΔL, the area ΔS=δ・ΔL is calculated from the pitch ΔL and the bending amount δ for each ΔL, and this is calculated as the distance L1
The area S shown by diagonal lines in FIG. 8 is determined by summing the entire length of . Then, subtract this area S from L1 · δmax to find the curved area S1 of the distance L1. From this curved area S1, find the height of a triangle whose length L1 is one piece that gives the same area, and calculate this height as the above ho. This is what I did. As a result, when the bending length of the tip of the bar material is large, the bending area S1 becomes large, so the calculated value ho becomes large, and the amount of movement of the bending force applying roller 12 becomes large. On the other hand, even if the maximum bending amount δmax is the same, when the bending length is short, the bending area S1 becomes small, so the calculated value ho also becomes small, and the amount of movement of the bending force applying roller 12 becomes small. By adjusting the amount of movement of the bending force applying roller 12 according to the bending length in this way, it is possible to minimize the bulge due to unbending at the opposite sheet width end and obtain the maximum bending correction rate. Become. In other words, in the above calculation, while the length and amount of bending of the tip change, the fulcrum roller 11 and the bending force applying roller 12 are fixedly installed in the length direction of the bar material, and the distance between them is L1. Considering that the bending force applying roller 1 is fixed, the bending force applying roller 1 is
This is an adjustment of the amount of movement in step 2.

Further, the bending amount of the front and rear ends of the bar material 9 is detected by the plate bending detector 2, and the shape of the front and rear ends of the bar material 9 can be recognized by the computer 15. Therefore, in this embodiment, using this information, the control device 18 determines at which position on the front and rear ends of the bar material the crop cut should be performed, and the command resulting from the determination is associated with the operation of the crop shear 4. Perform a crop cut at that position. This makes it possible to cut the crop at a position that has a small crop loss and matches the joint. Next, the configuration and characteristics of the tip bending correction device 3 will be explained in FIGS. 9 to 1.
1 will be explained. FIG. 9 is an overall plan view of the tip curvature correction device, and a portion is shown conceptually for the purpose of simplification of illustration. The table roller 13 is driven by a motor 14 and conveys the bar material 9 in the direction of the arrow. The support roller 10 is arranged on the frame 17 in the form of a side guide, and is driven by a motor 14A at a speed synchronized with the speed of the table roller 13. In addition, the frame 17 is driven by a drive unit 16 by a motor 15.
Move in the direction of the arrow through. Support rollers 10 are provided on both sides of the bar material. This allows the bar material to be accurately and reliably supported at the center of the path after the tip of the bar material has passed.

The fulcrum rollers 11 located on both sides of the bar material are fixedly installed on the frame 18 at intervals corresponding to the maximum board width, and are driven by a motor 20 via a drive device at a speed synchronized with the speed of the table roller 13. . Furthermore, three table rollers 19A are installed on this frame 18 and driven by a motor 14B. The frame 18 is moved by a motor 21 via a drive unit 22 in the direction of the arrow. Due to this movement of the frame 18, the fulcrum roller 11, which serves as a fulcrum when straightening the tip of the bar material, moves toward the width end of the bar material. Further, a pinch roller 19 is provided on the table roller 19A as shown in FIG.
It is attached to a frame 18A that is integrated with. With this configuration, even if the plate width changes, the pinch roller 19 is always present on the side where bending force acts on the bar material and compressive force acts, and the pinch roller 19 can be kept in the same state on that part, thereby preventing buckling of the bar material. Prevention can be ensured.

The bending force applying roller 12 is driven by a motor 23 and moved by a cylinder 24 in the direction of the arrow. A pair of this mechanism is arranged with a bar material in between, and the bending force applying roller 12 is moved to a predetermined position according to the bending direction of the bar material. Further, a table roller 20A driven by a motor 14C is arranged on the entrance side of the bending force applying roller 12, and a pinch roller 20A is placed on the table roller 20A as shown in FIG.
0 is located. Pinch roller 20 is cylinder 24A
The cylinder 24A is supported in a vertically movable manner by the frame 1.
It is attached to 8B.

[0033] With the above configuration, the bend of the bar material with a curved tip rolled by the rough rolling mill is corrected and crop cutting is performed, so that the next welding machine 5 can make a straight joint with aligned joint surfaces. This ensures good sheet threadability in the finishing mill row and improves yield.

Further, each roller 10, 11, 12 is driven by a motor 14A, 20, 2 in synchronization with the speed of the table roller 13.
3, these rolls can be avoided from becoming an obstacle to the conveyance of the bar material, and bends can be straightened while conveying the bar material. Therefore, the drop in temperature of the bar material when straightening the bends can be reduced.

[0035] In the above embodiments, only the correction of the curvature at the tip was described, but both the curvature at the tip and the curvature at the rear end may be corrected, thereby making it possible to join even more straightly. .

[0036]

[Effects of the Invention] According to the present invention, the bent end of the bar material is corrected while the bar material is running, and the rolled material is joined after being crop-cut, so that it is possible to join the rolled material in a straight manner with the joining surfaces aligned. As a result, a straight rolled material can be supplied to the finish rolling mill row, so that good sheet threading and continuous rolling can be performed, and hot thin sheet products can be manufactured with high efficiency and high yield.

In addition, in the plane bend correction type tip bend correction device, since lifting due to buckling of the bar material to which bending force is applied is prevented, accurate bend correction can be performed.

Furthermore, the rollers of the tip bending straightening device do not interfere with the conveyance of the rolled material, and the bending can be straightened while conveying the rolled material, so that the temperature drop in the rolled material can be reduced.

Furthermore, regardless of the width of the sheet, the compression side of the bending action of the rolled material is pinched near the fulcrum roller, so lifting can be effectively prevented.

Furthermore, since the moving direction, moving amount, and moving timing of each roller are controlled based on the detected amount of tip bending of the rolled material, simple and accurate bending correction can be performed.

Furthermore, crop cutting can be performed at a position suitable for joining based on the detected data of the shape of the leading and trailing ends of the rolled material, thereby eliminating crop miscuts.

[Brief explanation of drawings]

FIG. 1 is an overall layout diagram of main equipment of a continuous hot thin plate rolling facility according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the relationship between bending of the tip of a bar material and joining.

FIG. 3 is a diagram illustrating the principle of correcting tip bending according to the present invention.

FIG. 4 is a diagram showing a system configuration of a tip decurvature correction device according to an embodiment of the present invention.

FIG. 5 is a diagram showing a method of detecting the amount of tip bending using a plate bending detector.

FIG. 6 is a diagram showing how the support roller is controlled by the control device.

FIG. 7 is a diagram showing how the fulcrum roller is controlled by the control device.

FIG. 8 is a diagram showing a control mode of the bending force applying roller by the control device.

FIG. 9 is a diagram showing the overall configuration of the tip decurvature correction device shown in FIG. 4;

FIG. 10 is a sectional view taken along the line XX in FIG. 9;

11 is a sectional view taken along the line XI-XI in FIG. 9. FIG.

[Explanation of symbols]

1 Rough rolling mill 2 Plate bending detector 3 Tip bending correction device 4 Cropshire 5　Joining machine 6 Finishing rolling mill row 9 Bar material 10 Support roller 11 Fulcrum roller 12 Bending force applying roller 15 Computer 18 Control device

Claims (8)

[Claims] Claim 1: Continuous hot thin plate rolling equipment for manufacturing a hot thin plate by joining the trailing end of the leading material and the leading end of the trailing material after rolling in a rough rolling mill, and rolling the same in a row of finishing mills continuously. between the rough rolling mill and the finishing rolling mill row, a tip bend straightening device for correcting the tip bend of the bar material rolled by the rough rolling mill; 1. A continuous hot thin plate rolling facility, characterized in that a shear and a joining device for joining the rear end of the leading material and the leading end of the trailing material of the crop-cut bar material are arranged in this order. 2. At least one pair of support rollers that support the rolled material, and a pair of fulcrum rollers that provide a fulcrum against the bending force in the width direction of the rolled material that acts on the tip of the rolled material.
Applying a bending force in the width direction of the rolled material to the tip of the rolled material,
a pair of bending force applying rollers for correcting the tip bend of the rolled material by plane bending; and at least one roller disposed near the fulcrum roller to prevent the rolled material from lifting when the bending force is applied.
A tip straightening device for a rolled material, comprising a book pinch roller. 3. The apparatus for straightening the tip of a rolled material according to claim 2, wherein at least three pinch rollers are installed, one between the pair of fulcrum rollers and one each before and after the pinch rollers. Features a curved tip correction device. 4. The apparatus for correcting the bending of a tip of a rolled material according to claim 2, further comprising at least one pinch roller installed on the entry side of the bending force applying roller. 5. The apparatus for correcting the bending of a tip of a rolled material according to claim 2, further comprising driving means for driving each of the support roller, the fulcrum roller, and the bending force applying roller in synchronization with the speed of the table roller. Features a curved tip correction device. 6. The apparatus for correcting the bending of a tip of a rolled material according to claim 2, further comprising a common frame supporting the fulcrum roller and the pinch roller, and driving means for moving this frame in a direction intersecting the rolled material. A tip bending correction device characterized in that when one fulcrum roller moves to a position where it becomes a fulcrum, the other fulcrum roller and the pinch roller are moved together. 7. At least one pair of support rollers that support the rolled material, a pair of fulcrum rollers that provide a fulcrum for the bending force acting on the tip of the rolled material, and a pair of fulcrum rollers that apply the bending force to the tip of the rolled material. , a pair of bending force imparting rollers for correcting the bending of the tip of the rolled material; a plate bending detector installed on the upstream side of the support roller; and a plate bending amount detected by the plate bending detector to determine the amount of bending of the support roller. and a control means for controlling the movement direction, movement amount, and movement timing of the fulcrum roller and the bending force applying roller. 8. Continuous hot rolling, in which the trailing end of the leading material and the leading end of the trailing material after rolling in a rough rolling mill are joined by a joining machine, and then continuously rolled in a row of finishing mills to produce a hot thin plate. In a thin plate rolling equipment, a plate bending detector, a tip bending correction device, and a crop shear are arranged in this order between a rough rolling mill and a joining machine, and the tip bending is determined based on the amount of plate bending detected by the plate bending detector. In addition to controlling the straightening device, based on the shape data of the leading and trailing ends of the rolled material detected by the plate bending detector, the optimum cutting position of the leading and trailing end crop after straightening the bending of the leading and trailing ends of the rolled material is calculated, and the crop shear is driven. A continuous hot thin plate rolling facility characterized by being equipped with a control means.