JP3036877B2 - Continuous hot strip rolling equipment and rolled material straightening equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling equipment for producing a hot thin plate, and in particular, corrects a bending of a bar material after rough rolling, cuts a crop at a front and rear end, and straightens a joining surface. The present invention relates to a continuous hot sheet rolling equipment and a front-rear end straightening apparatus for joining a rear end of a preceding material and a front end of a following material in alignment and continuously rolling a hot thin plate by a finish rolling mill.

[0002]

2. Description of the Related Art In the production of a hot thin plate, a slab material having a thickness of about 250 mm is reduced and rolled by a rough rolling mill to an intermediate material called a bar material having a thickness of 20 to 40 mm. However, the tip of the bar is often bent. When the bent tip is supplied to a finishing mill train in which the next 6 to 7 rolling mills are arranged, the tip bend is further enlarged, the bend of the product is increased, and the yield is reduced. In addition, when the tip of the bar material is large, there is a problem that a tip drawing accident occurs in the finishing mill row.

[0003] Conventionally, as regards the control of the posture or bending of a rolled material in a hot rolling facility, for example, as described in Japanese Patent Application Laid-Open No. Sho 61-222626, a shift from a centering position of a slab being conveyed is considered. A method of centering the slab without pause by a cylinder device based on the measured value by a sensor, or a level adjusting device and a side adjuster before and after a width sizing press as described in JP-A-62-134108. By disposing 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 orientation of the hot material with respect to the width sizing press is stabilized,
There is a method for preventing bending of a hot material. However,
There is no effective way to correct bar tip bending.

Recently, for example, Japanese Patent Application Laid-Open No. 58-1126
As described in Japanese Patent Publication No. 01, a method has been proposed in which the rear end of the preceding bar and the front end of the succeeding bar of the above-mentioned bar are joined and continuously rolled by a finishing mill train.

[0005] If continuous rolling becomes possible, very large effects such as energy saving, yield improvement and labor saving can be expected. At the time of joining, the bar at the front and rear ends of the bar material is cut with a crop shear, but if the bar material tip is bent at this time, the bar material is joined with the bend. , The yield is reduced. Furthermore, it causes misroll rolling. If the bend is removed by increasing the crop cut amount, the problem of the sheet passing property is solved, but the yield is further reduced.

[0006]

As described above, in the prior art, no consideration is given to correcting the bending of the front and rear ends of the bar material, and the bar material is supplied to the finishing mill with the front end bent. Therefore, there is a problem of lowering the yield and causing a tip drawing accident. Particularly, a continuous hot thin sheet that is continuously rolled in a finishing rolling mill row by joining the rear end of the preceding bar material and the front end of the following material. In the rolling equipment, there is a problem that the part is rolled and expanded as it is in the finish rolling mill row because the part is joined with a bend, thereby lowering the yield and causing misroll rolling.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and correct the bending of the leading and trailing ends of a rolled material during traveling, thereby providing a continuous hot thin-plate rolling equipment and a straightening device for bending a tip which are excellent in yield and threadability. To provide.

[0008]

In order to achieve the above-mentioned object, the present invention joins a trailing end of a preceding material and a leading end of a succeeding material after rolling by a rough rolling mill, and continuously joins the same in a finishing rolling mill row. In a continuous hot thin plate rolling equipment for producing a hot thin plate by rolling, between a rough rolling mill and a finish rolling mill row, a tip bending straightening device for correcting a tip bending of a bar material rolled by a rough rolling machine, A cropper for crop-cutting the bar material having the straightened tip and a joining device for joining the front end of the preceding material and the leading end of the succeeding material of the cropped bar material are arranged in this order. is there.

The present invention also provides at least one pair of support rollers for supporting a rolled material, and a pair of fulcrum rollers for providing a fulcrum for a bending force acting on the leading end of the rolled material in the width direction of the rolled material plate. The bending force in the width direction of the rolled material plate is applied to the rolled material tip to correct the bent end of the rolled material by plane bending 1
A straightening device for a bent end of a rolled material, comprising: a pair of bending force imparting rollers; and at least one pinch roller disposed near the fulcrum roller and configured to prevent the rolled material from rising when the bending force is imparted. Is provided.

[0010] Here, one pinch roller is provided between a pair of fulcrum rollers, and one pinch roller is provided before and after the fulcrum roller.
It is preferable to install the pinch roller at the entrance of the bending force applying roller.

Further, it is preferable to provide a 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.

Further, a common frame for supporting the fulcrum roller and the pinch roller, and a driving means for moving the frame in the crossing direction of the rolled material are provided, and when the fulcrum roller is moved to the fulcrum position, the other fulcrum roller is moved to the other position. It is preferable to move the fulcrum roller and the pinch roller integrally.

In order to achieve the above object, the present invention provides at least one pair of support rollers for supporting a rolled material, and a pair of fulcrum rollers for providing a fulcrum for a bending force acting on the leading end of the rolled material. A pair of bending force applying rollers for applying the bending force to the leading end of the rolled material to correct the bent end of the rolled material, a plate bending detector installed upstream of the support roller, and a plate bending detector Control means for controlling the moving direction, the moving amount and the moving timing of the support roller, the fulcrum roller and the bending force applying roller based on the detected amount of plate bending detected by the method described above. is there.

The present invention also relates to a method for manufacturing a hot thin sheet by joining a trailing end of a preceding material and a leading end of a succeeding material after rolling in a rough rolling mill by a joining machine and continuously rolling in a finishing mill train. In a continuous hot strip rolling equipment, a plate bending detector, a tip bending straightening device and a cropper are arranged in this order between a rough rolling mill and a joining machine, and a plate bending detection amount detected by the plate bending detector. By controlling the tip bending straightening device by,
Based on the shape data of the leading and trailing end of the rolled material detected by the plate bending detector, the optimum cutting position of the leading and trailing end crop after straightening of the leading and trailing end of the rolled material is calculated, and control means for driving the cropper is provided. is there.

[0015]

By arranging a straightening device, a cropper and a joining device in this order between a rough rolling mill and a finishing mill row, the straightness is corrected before joining the rolled material.
Since the crop cutting is performed, straight joining in which the joining surfaces are aligned can be performed, and good threadability in the finishing rolling mill row is secured, and the yield is improved.

Further, the tip bending correcting device is a flat bending correcting system including a support roller, a fulcrum roller, and a bending force applying roller, and at least one pinch roller for preventing floating of the rolled material is provided near the fulcrum roller. By arranging, it is possible to prevent the bar material subjected to the bending force from being lifted due to buckling and to perform accurate bending correction.

Further, by providing a drive means for driving each roller in synchronization with the speed of the table roller, these rolls can be arranged without obstructing the transport of the rolled material, and the straightening can be performed while the rolled material is transported. Therefore, a decrease in the temperature of the rolled material can be reduced.

Further, by moving the other fulcrum roller and the pinch roller integrally with each other when the one fulcrum roller moves to the fulcrum position, the bending action of the rolled material near the fulcrum roller regardless of the width of the plate is achieved. The compression side is pinched, and effective lifting can be prevented.

In addition, a plate bending detector is installed upstream of the support roller, and the support roller,
By controlling the moving direction, the moving amount, and the moving timing of the fulcrum roller and the bending force applying roller, simple and accurate bending correction can be performed.

Further, since the shape of the front and rear ends can be measured when the amount of bending is detected by the plate bending detector, an optimum crop cut position is calculated based on the shape data, and the position corresponding to the joining is controlled by controlling the crop shear. Can be used to cut the crop and eliminate crop miscuts.

Although only the correction of the tip bending has been described above, it goes without saying that both the correction of the tip bending and the correction of the rear end bending may be performed.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows an overall layout of the main equipment of a continuous hot strip rolling equipment. A bar material rolled from a slab by a rough rolling mill 1 detects a tip shape, a bending amount, and the like by a plate bending detector 2. Based on the data, the bending of the bar is corrected by the tip bending straightening device 3, the tip is cropped by the cropper 4, passed through the joining machine 5, transported and rolled by the finishing mill train 6, and then subjected to the down coiler 8. And start winding.
Similarly, the rear end of the bar material is also cropped by the cropper 4 and transported to the joining machine 5. During this time, the next slab is rolled in the rough rolling mill 1, and the leading end of the next bar material arrives at the joining machine 5 through the same process as the preceding material by the detector 2, the tip bending correcting device 3 and the cropper 4, and The rear end of the material and the front end of the following material are joined by a joining machine 5 that moves in synchronization with the transport speed of the bar material. The joined preceding and succeeding materials are continuously rolled in a finishing mill train 6 and cut by a split shear 7, the leading material is wound by a down coiler 8, and the succeeding material is wound by another down coiler 8A. Taken. This operation is continuously repeated, and the hot thin plate is continuously rolled by the finishing mill train 6.

Next, the relationship between the bending of the front and rear ends and the joining will be described with reference to FIG. In FIG. 2, (a) shows the trailing end of the preceding material and the leading end of the following material without bending, and the hatched portion shows the portion to be crop-cut. With such a bar material, the joining surfaces are aligned as shown in FIG. However, if the tip of the following material is bent as shown in (c), the crop is cut at a right angle to the moving direction of the bar material, so that the joining surface as shown in (d) is formed. They are joined in a displaced state, and are rolled by the finish rolling mill train 6 in this state, which is problematic in terms of sheet passability and yield. In this embodiment, in order to solve this problem, a tip bending straightening device 3 is arranged between the rough rolling mill 1 and the cropper 4 to correct the tip bending of the bar material after the rough rolling.
As shown in FIG. 2A, the front and rear end crops are cut, and FIG.
The rear end of the preceding material and the front end of the following material are joined in the aligned state as shown in (b), and the hot thin plate is continuously rolled by the finish rolling mill train 6.

The principle of the straightening of the straightening device 3 of this embodiment will be described with reference to FIG. In FIG. 3, reference numeral 9 denotes a bar material having a tip bend having a bending amount δ, and a support roller 10, a fulcrum roller 11, and a bending force applying roller 12 are provided on the bar material 9 at predetermined intervals of L ₁ and L ₂ . Bar material 9 each
And placed on both sides. Immediately after the leading end of the bar member 9 has passed through the bending force applying roller 12, the bending force applying roller 12 located on the bending side of the bar member leading end is moved to the position indicated by the two-dot chain line, whereby the opposing fulcrum roller 11 is moved. , The plane bending force P is applied to the bar member 9 while being supported by the support roller 10 on the same side as the bending force applying roller 12 during operation. As a result, the hatched portion a on the roller 11 side serving as the fulcrum is compressed, and the hatched portion b on the opposite side is elongated, whereby the bar member 9 is straightened in reverse as indicated by a two-dot chain line. At this time, since the bar material 9 is being conveyed on the table roller, the bar material tends to buckle at the oblique line portion a due to the compressive force, and tends to lift up at the bending force applying roller 12 portion. For this reason, a pinch roller is arranged in this embodiment to prevent this.

Next, a system configuration including the tip bending correction device 3 will be described with reference to FIG. In FIG. 4, the support roller 10, the fulcrum roller 11, and the bending force applying roller 12 of the straightening device 3 are shown on only one side, and the other side is not shown. The tip bending straightening device 3 includes three pairs of support rollers 10 and one pair of fulcrum rollers 11 and bending force imparting rollers 12, respectively. The periphery of the fulcrum rollers 11 is used to prevent the bar material from floating due to buckling. Three pinch rollers 19 are provided, and the bending force applying roller 12 is provided.
One pinch roller 20 for preventing the bar material from lifting up is also provided on the entry side of the pinch roller. The pinch roller 19 around the fulcrum roller 11 is composed of two fulcrum rollers 1.
The center pinch roller 19 sandwiched between the two is most effective for preventing lifting due to buckling.
Only one pinch roller may be provided, or three or more pinch rollers may be provided as necessary.

On the entry side of the support roller 10, the above-described plate bending detector 2 and a speedometer 14 for detecting the transport speed of the table roller 13 are arranged. The plate bending detector 2 detects the width direction position of the bar material at intervals of ΔL pitch from the tip of the bar material 9 conveyed in the direction of the arrow on the table roller 13, and detects the detected data with the speedometer 15. The computer 15 determines the transport speed of the table roller 13 detected.
5 and the shape shown in FIG. 5 is calculated from these data to obtain the plate width W and the bending amount δ at a point L ₁ from the tip.
max is recognized as the maximum bending amount. Processing data is CR
The image is processed and displayed at T16, and printed out by the printer 17 as necessary. Computer 1
5, the processing data is input to the control device 18, and the support roller 10, the fulcrum roller 11, and the bending force applying roller 1
2. The moving direction, the moving amount, and the moving timing are controlled. Details of this control will be described in detail below with reference to FIGS.

The support roller 10 moves to a position shown by a two-dot chain line in FIG. 6, that is, a position at a distance h ₁ from the width end of the bar member 9 and stands by. Here, assuming that a margin value at the time of passing through the bent end portion is α, h ₁ = δmax + α. Then, after passing through the tip bend, and the distance moved in the h ₁ bar member 9
Contact the end of the width of the plate. Before the fulcrum roller 11 passes the tip of the bar material, the roller on the opposite side to the bending direction of the tip is passed through.
The vehicle retreats at the position indicated by the two-dot chain line in FIG. 7, that is, at the distance of h ₂ of h ₂ = α from the end of the bar width of the bar member 9, and moves to the position of the solid line by h ₂ , α after passing. After this movement is completed, the pinch roller 19 descends and pinches the bar 9.

The bending force applying roller 12 retreats at the position indicated by the two-dot chain line in FIG. 8, that is, at the position α from the end of the width of the bent portion, and at the same time as the bent portion arrives, h ₃ = _ho + α. And then retreat immediately. Where h _o
Is the calculated value,

[0029]

[Number 1] _{h o = 2 (L 1 ·} δmax-S) / L 1 However, S = Σδ · ΔL i.e., pitch [Delta] L and curve amount [delta] from the area ΔS = δ · ΔL per [Delta] L per pitch [Delta] L calculated, determined total of the area S indicated by oblique lines in FIG. 8, the total length of the distance L ₁ so. Then, this area S is subtracted from L ₁ · δmax to determine a bent area S ₁ at a distance L ₁ , and a piece that gives the same area from the bent area S ₁ obtains the height of a triangle having a length L _1. Is _{defined as ho} described above. Thereby, when the bending length of the bar tip is large, the bending area S
_{Since 1} increases, the calculated value _ho increases, and the amount of movement of the bending force applying roller 12 increases. On the other hand, even if the maximum bending amount δmax is the same, when the bending length is short, the bending area S ₁ is small, so the calculated value h _o is also small, and the moving amount of the bending force applying roller 12 is small. By adjusting the amount of movement of the bending force applying roller 12 in accordance with the bending length in this way, it is possible to minimize the bulge due to bending back at the opposite plate width end and obtain the maximum bending straightening rate. Become. In other words, in the above calculation, while the length of the tip bend and the amount of the bend 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 interval between them is L1. In consideration of the fact that the bending force is fixed, the moving amount of the bending force applying roller 12 is adjusted so that the maximum bending correction rate can be obtained regardless of the bending length of the tip.

Further, the bending amount of the front and rear ends of the bar 9 is detected by the plate bending detector 2, and the end shape of the front and rear ends of the bar 9 can be recognized by the computer 15. Therefore, in this embodiment, using this information, the controller 18 determines at which position on the rear end of the bar to perform the crop cutting, and associates the command of the determination result with the operation of the cropper 4. Performs a crop cut at that position. As a result, it is possible to cut the crop at a position where the crop loss is small and matches the joining. Next, the configuration and characteristics of the tip bending correction device 3 will be described with reference to FIGS.
1 will be described. FIG. 9 is an overall plan view of the tip bending straightening device, part of which is conceptually shown for the purpose of simplifying the drawing. The table roller 13 is driven by a motor 14 and transports the bar 9 in the direction of the arrow. The support roller 10 is disposed on the frame 17 in a side guide shape, and the motor 14A
, And is driven at a speed synchronized with the speed of the table roller 13. The frame 17 is driven by the motor 15 by the driving machine 1.
6 in the direction of the arrow. Support roller 10
Are provided on both sides of the bar material. Thus, the bar material can be accurately and reliably supported at the center of the path after passing through the tip of the bar material.

The fulcrum rollers 11 located on both sides of the bar member are fixedly installed on the frame 18 at intervals corresponding to the maximum plate width, and are driven by a motor 25 via a driving device to drive the table rollers 13.
It is driven at a speed synchronized with the speed of. Also, three table rollers 19A are installed on the frame 18 and driven by a motor 14B. The frame 18 is moved by a motor 21 via a driving device 22 in the direction of the arrow. Due to the movement of the frame 18, the fulcrum roller 11 serving as a fulcrum at the time of correcting the bending of the tip of the bar material moves toward the plate width end. As shown in FIG. 10, a pinch roller 19 is provided on the table roller 19A, is supported by a cylinder 24 so as to be vertically movable, and the cylinder 24 is attached to a frame 18A integrated with the frame 18. With this configuration, even when the plate width changes, the pinch roller 19 is always present on the side where the bending force acts on the bar material and the compressive force acts, and the portion can be pinched in the same state. Prevention can be reliably performed.

The bending force applying roller 12 is driven by a motor 23 and is moved by a cylinder 26 in the direction of the arrow. This mechanism is arranged in a pair with a bar material interposed therebetween, and the bending force applying roller 12 is moved to a predetermined position according to the bending direction of the bar material.
A table roller 20A driven by a motor 14C is disposed on the entry side of the bending force applying roller 12, and a pinch roller 2 is disposed on the table roller 20A as shown in FIG.
0 is located. The pinch roller 20 is a cylinder 24A
The cylinder 24A is supported by the frame 1
8B.

According to the above-described configuration, the bar material having the bent tip rolled by the rough rolling machine is straightened, and the crop cutting is performed. As a result, good threadability in the finishing rolling mill row is secured and the yield is improved.

The motors 14A, 25 , 2 are driven in synchronization with the rollers 10, 11, 12 in synchronism with the speed of the table roller 13.
Since the rollers are driven by 3, the rolls can be prevented from obstructing the transport of the bar material, and the straightness can be corrected while the bar material is being transported. Therefore, the temperature drop of the bar material when performing the straightening can be reduced.

In the above embodiment, only the correction of the tip bending has been described. However, both the correction of the tip bending and the correction of the rear bending may be performed, whereby a more straight joint can be achieved. .

[0036]

According to the present invention, since the tip of the bar material is straightened while running, and the rolled material is joined after crop cutting, the joining of the straight rolled material in which the joining surfaces are aligned becomes possible. As a result, since a straight rolled material can be supplied to the finishing mill train, good threading and continuous rolling can be performed, and a hot thin product with high efficiency and high yield can be manufactured.

Further, in the flat-end bending type tip bending straightening device, the bar material to which the bending force is applied is prevented from floating due to buckling, so that accurate bending straightening can be performed.

Further, since each roller of the tip bending straightening device does not hinder the transport of the rolled material and can perform the straightening while transporting the rolled material, a decrease in the temperature of the rolled material can be reduced.

Furthermore, the compression side of the bending action of the rolled material is pinched near the fulcrum roller irrespective of the width of the plate, so that effective lifting can be prevented.

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

Further, since cropping can be performed at a position suitable for joining based on the detection data of the front and rear end shapes of the rolled material, miscutting of the crop is eliminated.

[Brief description of the drawings]

FIG. 1 is an overall layout view of main components of a continuous hot strip rolling facility according to an embodiment of the present invention.

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

FIG. 3 is a principle diagram of straightening of a tip according to the present invention.

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

FIG. 5 is a diagram illustrating a method of detecting a tip bending amount by a plate bending detector.

FIG. 6 is a diagram illustrating a control mode of a support roller by a control device.

FIG. 7 is a diagram showing a control mode of a fulcrum roller by a control device.

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

FIG. 9 is a view showing the entire configuration of the tip bending straightening device shown in FIG. 4;

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rough rolling mill 2 Sheet bending detector 3 Tip bending straightening device 4 Crop shear 5 Joining machine 6 Finishing rolling mill row 9 Bar material 10 Support roller 11 Supporting roller 12 Bending force imparting roller 15 Computer 18 Controller

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21B 15/00 B21D 1/02

Claims (8)

(57) [Claims] 1. A continuous hot strip rolling equipment for manufacturing a hot strip by joining a trailing end of a preceding material and a leading end of a succeeding material after rolling in a rough rolling mill and continuously rolling in a finishing rolling mill row. In, between a rough rolling mill and a finishing rolling mill row, a tip bending straightening device for correcting the tip bending of the bar material rolled by the rough rolling machine, a crop for performing a crop cutting of the bar material having the straightened tip A continuous hot thin-sheet rolling facility, comprising a shear and a joining device for joining a trailing end of a preceding bar and a leading end of a trailing bar of the bar material having been crop-cut in this order. At least one pair of support rollers for supporting the rolled material, a pair of fulcrum rollers for providing a fulcrum for a bending force in the width direction of the rolled material plate acting on the leading end of the rolled material, and A pair of bending force applying rollers for applying a bending force in the rolled material sheet width direction to correct the tip bending of the rolled material by plane bending, and disposed near the fulcrum roller, An apparatus for correcting a bent end of a rolled material, comprising: at least one pinch roller for preventing lifting. 3. The apparatus according to claim 2, wherein the pinch roller includes at least one pinch roller between the pair of fulcrum rollers, and one pinch roller before and after the pair of fulcrum rollers.
A tip bending straightening device characterized by the main installation. 4. The apparatus according to claim 2, further comprising at least one pinch roller provided on an entrance side of the bending force applying roller. 5. The apparatus according to claim 2, further comprising driving means for driving each of said support roller, fulcrum roller and bending force applying roller in synchronization with a speed of a table roller. Characteristic tip straightening device. 6. The apparatus according to claim 2, further comprising a common frame that supports the fulcrum roller and the pinch roller, and a driving unit that moves the frame in a crossing direction of the rolled material. A tip bending straightening device characterized in that, when one fulcrum roller moves to a position to be a fulcrum, the other fulcrum roller and the pinch roller are integrally moved. 7. A pair of support rollers for supporting a rolled material, a pair of fulcrum rollers for providing a fulcrum for a bending force applied to the rolled material tip, and applying the bending force to the rolled material tip. A pair of bending force imparting rollers for correcting the bending of the leading end of the rolled material, a plate bending detector installed upstream of the support roller, and the support roller based on a plate bending detection amount detected by the plate bending detector. And a control means for controlling a moving direction, a moving amount, and a moving timing of the fulcrum roller and the bending force applying roller. 8. A continuous hot working in which a rear end of a preceding material and a front end of a succeeding material after rolling by a rough rolling mill are joined by a joining machine, and continuously rolled by a finishing mill train to produce a hot thin plate. In the sheet rolling equipment, a plate bending detector, a tip bending correction device and a cropper are arranged in this order between the rough rolling mill and the joining machine,
The tip bending straightening device is controlled by the plate bending detection amount detected by the plate bending detector, and the shape data of the rolled material leading and trailing edge detected by the plate bending detector is used to calculate the leading and trailing edge of the rolled material leading and trailing edge after straightening. A continuous hot strip mill comprising a control means for calculating an optimum cut position of the crop and driving the crop shear.