JPH0275407A - Device for measuring side crop of thick steel plate - Google Patents

Abstract

PURPOSE:To improve the yield of steel stocks by sampling width values of a thick steel plate every constant distance on the outlet side of a rolling means and adjusting a thickness setting pattern of the rolling means according to a parameter calculated based on the plate width information. CONSTITUTION:A steel stock 7 delivered from a rough rolling mill (rolling means) 6 is passed through a finish rolling mill 8 and a straightener 9 to be a thick steel plate. Widths of the thick steel plate is detected by a width gage (outlet side plate width detecting means) 10. The widths are sampled every a constant distance in the plate transfer direction. Sampled groups of plate width information are processed to calculate a shape parameter of distribution of width variations. A roll drafting device (rolling adjusting means) 6e is controlled based on the parameter and a rolling control means adjusts a thickness setting pattern of the rough rolling mill (rolling adjusting means) 6e corresponding to respective positions in the transfer direction of the plate. Thus, the yield of the steel stock is improved.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is a method for side crop measurement of thick steel plates in rolling equipment for thick steel plates, which automatically adjusts the planar shape of the steel plate on the exit side of the rolling mill to a desired shape. Regarding equipment.

[Prior Art] The thickness of a steel plate at the exit side of a rolling mill can be set relatively accurately by adjusting the normal pass schedule of the rolling mill, that is, adjusting the rolling reduction value and the gap between the rolls. However, since the planar shape of the steel plate on the exit side of the rolling mill changes depending on various operating conditions at the time, it is difficult to achieve the desired shape.

In particular, even when a steel plate with uniform width (i.e., square) and uniform thickness is passed through a rolling mill, the planar shape on the exit side of the rolling machine is different from the leading edge in the conveying direction to the rear. In many cases, the plate is shaped like a drum, with a width smaller than that of the stationary part in the center, or shaped like a drum, with the front end and the rear part in the conveyance direction being wider than the stationary part at the center. In any case, if the width of the strip at the exit side of the rolling mill is not uniform, the overall width of the strip is set to be large in advance and a portion with a large width of the strip, that is, a side crop, is cut off, resulting in a decrease in yield. This type of planar shape changes depending on various operating conditions, so it is difficult to predict the planar shape at the exit side of the rolling mill in advance.
It is difficult to correct it in the rolling equipment.

Furthermore, in order to automatically detect and measure the shape of the steel plate on the exit side of the rolling mill, it is necessary to measure the steel plate while it is being transported immediately after the rolling process is completed. However, on the exit side of the rolling mill, due to poor mechanical precision of the rolling rolls or changes in various rolling conditions, the steel plate being conveyed may be shaken in the thickness direction or width direction. In many cases, this type of wobbling will cause a large error in the octavo results, making it extremely difficult to continuously measure the exact board width. Therefore,
Conventionally, there has been no technology for measuring the planar shape of a steel plate being transported in a rolling facility, particularly the shape related to side crops.

In addition, as conventional techniques for detecting the plate width etc. of a steel plate, Japanese Patent Application Laid-Open No. 61-37308 and Japanese Patent Application Laid-Open No. 61-172609 are known.
The techniques disclosed in Japanese Patent Publication No. 63-28242 are known.

[Problems to be Solved by the Invention] The present invention provides a side crop measuring device for thick steel plates that can automatically measure the planar shape of a steel plate on the exit side of a rolling mill and automatically adjust the shape to a desired shape. The purpose is to provide.

[Means for Solving Eight Problems] In order to achieve the above object, the present invention includes: at least one rolling means disposed in the conveyance path of the thick steel plate; a rolling adjustment drive for adjusting the rolling characteristics of the rolling means; Means; Output side plate width detection means provided on the outlet side of the rolling means to detect the width of the thick steel plate at the outlet side of the rolling means; and the plate width detected by the outlet side plate width detection means, Samples are repeatedly sampled at substantially constant distances in the conveyance direction, the sampled sheet width information group is processed to calculate shape parameters related to the distribution of sheet width changes, and the rolling adjustment drive is adjusted according to the calculated shape parameters. The thickness setting pattern of the rolling means corresponding to each position on the thick steel plate in the conveyance direction is adjusted by controlling the means. A rolling control means is provided.

[Effect] In other words, by repeatedly sampling the width of the steel plate being transported at the exit side of the rolling mill, the distribution of plate width changes, that is, the planar shape of the steel plate, can be identified, and based on this, parameters related to side crop etc. can be determined. For example, on the exit side of a finishing rolling mill, it is necessary to make the width of the steel plate uniform and reduce the side crop.
In the present invention, since the planar shape of the steel plate on the exit side of the rolling mill can be grasped, the side crop can be reduced by compensating for the thickness pattern of the steel plate on the entry side of the finishing rolling mill by adjusting the pass schedule of the roughing mill. Can be done.

For example, if the planar shape of the steel plate on the exit side of the finishing rolling mill is drum-shaped (widths at the tip and rear ends are smaller than the center), the thickness pattern of the steel plate at the entrance side of the finishing rolling machine should be set so that the tip and rear ends are wider than the center. Adjust it to be thicker.

In rolling with a finishing mill, the amount of width expansion at the leading and trailing ends increases, the strip width on the exit side of the finishing mill becomes uniform, and side crop decreases. On the other hand, the planar shape of the steel plate on the exit side of the finishing rolling mill is drum-shaped (the width at the tip and rear end is wider than the center).
In this case, if the thickness pattern of the steel plate at the entry side of the finishing mill is adjusted to be thinner at the leading and trailing ends than in the center, the amount of width expansion at the leading and trailing ends will be reduced during rolling in the finishing mill. , the strip width on the exit side of the finishing mill becomes uniform, and side crops are reduced. The thickness pattern of the steel plate at the entry side of the finishing rolling mill is determined by setting the pass schedule of the rough rolling mill located upstream of the finishing rolling mill to 3 times per rolling position of the steel plate! It can be adjusted as desired by Jll.

Further, in a preferred embodiment of the present invention to be described later, a read/write memory means is provided to store learning values corresponding to the detected shape parameters for each operating condition, and to adjust the thickness setting of the rolling means based on the learning values. While adjusting the pattern, the learned value is corrected according to the shape parameter calculated at that time and the learned value. According to this, even when rolling the first sheet after the operating conditions change, the learned values of the past shape parameters under the new operating conditions are saved, so the planar shape at the exit side of the rolling mill can be adjusted with a large error. It is possible to predict without occurrence of side cropping and increase yield by minimizing side crops.

[Example] Fig. 1 schematically shows the configuration of the main parts of one type of steel plate manufacturing equipment for implementing the present invention.

Referring to Figure 1, the conveyor line 1 for thick steel plates in this equipment
5 includes a weighing scale 1. Heating furnace 2. Rotating table 49 width long needle 5. Rough rolling mill6. Finishing rolling mill 8° straightening machine (hot leveler)9. Plate width gauge lO1 cooling device 11. cropshire 1
2. A side shear 13 and an end shear 14 are provided.

First, the processing in each step will be briefly explained.

The steel material (i.e. slab) 7 is first measured by the weighing scale 1, and then reheated by the heating furnace 2.
It is conveyed by the conveyance roller 3 and moves on to the next process. and,
A width meter 5 measures the width and length of the steel material 7 before rolling.

Although the specific structure of the long width needle 5 is not shown, it is equipped with a large number of detection devices so that the positions of both ends of the steel material 7 in the width direction can be simultaneously measured every 15 cm in the transport direction over the entire length in the transport direction. The width and length of the steel members 7 are measured while they are stationary.

The steel material 7 whose width and length have been measured is conveyed again by the conveyance rollers, and is first sent to the rough rolling mill 6 where it is roughly rolled. In rough rolling, the sheet is passed through several buses repeatedly.

The orientation of the steel material 7 is rotated by 90 degrees in a plane using the rotation table 4 provided on the entry side of the rough rolling mill 6.

Rolling is performed in both the longitudinal and transverse directions. Furthermore, although the details will be described later, in this rough rolling, the thickness of the steel material after rolling is adjusted according to its position,
The planar shape of the steel material after finish rolling downstream thereof is controlled to be rectangular.

This rough rolling mill 6 has a four-layer structure, including work rolls 5a and 5b for rolling the steel material, and a backing roll 6c for supporting them.
, 6d, and a roll lowering device 68 for adjusting the positions of the rolls 6a, 6c.

Inside the roll lowering device 68, a load cell and a position detector 9 are installed.
It is equipped with a position adjustment screw and an electric motor for driving. In addition, a pulse generator 6 is installed on the rotating shaft of the backing roll 6d.
f is coupled and outputs one pulse signal each time the roll 6d moves by a predetermined amount.

The steel material 7 that has been rough rolled is then sent to a finishing mill 8 for finishing rolling.The configuration and operation of the finishing rolling mill 8 are the same as those of the rough rolling mill 6 described above.

The steel material 7 that has been finish rolled is sent to a straightening machine 9.

It is strongly supported from the periphery by a large number of rolls 9a and 9b arranged above and below so that it does not move in any direction other than the transport direction, and warpage in the thickness direction is corrected. A pulse generator 9c is provided on the rotating shaft of one roller of the straightening machine 9, which outputs one pulse signal each time the roller moves by a predetermined amount (corresponding to 4.2-Peng of the #I4 plate movement amount). combined.

When the straightening is completed, the steel material 7 is transferred to the plate width gauge 10 and the cooling device 1.
1 to the cutting section. At the cutting section, first, the unnecessary portion of the tip of the steel plate, that is, the crop, is removed by the crop shear 12, and then the unnecessary portion in the width direction of the steel material is removed by the side shear 13.

That is, the side crop is removed, and then the end shear 14 is removed.
The steel is cut into the lengths required for each product.

Next, the plate width meter IO will be specifically explained. The reason why the plate width gauge 10 is placed immediately after the straightening machine 9 is because the steel material 7 vibrates in the thickness and width directions downstream of the rolling mill, which tends to cause large errors in measurement. This is because the steel material 7 does not vibrate on the side.

FIG. 2a shows the plate width meter 10 of FIG. 1 viewed from the front in the conveying direction of the steel material 7, and FIG. 2b shows a cross section of FIG. 2a. Referring to each episode, this plate width meter 10 has a steel material 7
The detection unit 20 is arranged above the transport path, and the light sources 21 and 22 are arranged below the transport path.

The light sources 21 and 22 each form a linear light source extending along an axis perpendicular to the conveyance direction of the steel material 7, and the optical axis is directed upward, that is, toward the conveyance path of the steel material 7 and the detection unit 20. .

The detection section 20 includes two detection units 23 and 24. These are movable within a predetermined range in the width direction of the steel material 7, and are each positioned at a predetermined position by a width setting mechanism 25 disposed at the center. One detection unit 23 detects the position of one end (work side) on the front side in the width direction of the steel material 7, and the other detection unit 24 detects the position of one end (drive side) on the rear side in the width direction of the steel material 7. It is supposed to be done. By adjusting the position (interval) of the detection units 23 and 24 by the width setting mechanism 25, various dimensions (width 1 to 4.5
It can be used to measure the width of steel materials (m).

Since the two detection units 23 and 24 have the same configuration, one of the detection units 23 will be explained. This unit includes a concave reflecting mirror 23b, a planar reflecting mirror 23C, an imaging lens 23d, and -Dimension C
A CD image sensor 23e is provided. That is, among the light emitted from the light source 21, the luminous flux that is not blocked by the steel material 7 is reflected by the reflection fi 23b, reflected again by the first reflecting mirror 23c, and passes through the imaging lens 23d to the image sensor 2.
It is incident on 3e.

The image sensor 23e has a structure in which detection elements for 5000 pixels are arranged in a row along the same direction, and these detection elements have a detection area (
A one-dimensional optical image corresponding to a width of about 30 cm) is reduced and projected. In other words.

Since the image sensor 23e detects a one-dimensional optical image including the incident light from the light source 21 and the shadow of the steel material 7, the position where the brightness of the detected image changes is the position of the edge of the steel material 7. corresponds to Therefore, the image sensor 23e can detect the position of the edge of the steel material 7.

However, since the position is detected as a relative position on the detection unit 23, the actual edge position of the steel material 7 is
It is determined by both the absolute position of the detection unit 23 at that time and the relative position detected by the image sensor 23a.

Description will be made with reference to FIG. 3, which schematically shows the configuration of an electrical system that controls the manufacturing equipment shown in FIG. 1.

The weighing scale 1 and the heating furnace 2 are connected to a heating system process control unit 200, and are controlled by the heating system process control unit 200. Rough rolling mill6. The finishing rolling mill 8 includes a width gauge controller 310 and a rough rolling controller 320 . It is connected to the rolling system process control unit 300 via the finishing rolling controller 330 and the finishing rolling controller 330 .

The width/long needle controller 310 controls one width/long needle according to instructions from the rolling process control unit 300, reads the width and length of the steel material 7, and sends the information back to the rolling process control unit 300. The rough rolling controller 320 and the finish rolling controller 330 each adjust the rolling reduction value of the rolling mill and the gap between the rolls based on instructions from the rolling system process control unit 300, that is, the rolling pass schedule.

The plate width gauge 10 is connected to the cooling system process control unit 400 via the plate width gauge controller 340, and the cooling bag ff1
ll is directly connected to the cooling system process control unit 400. The sheet width system controller 340 drives the width setting mechanism 25 of the sheet width meter 1O with a servo motor (not shown) in response to a width setting instruction from the cooling system process control unit 400, and moves the width setting mechanism 25 of the sheet width meter IO to a reference position (detection The distance between the center of the area) and the base position on the detection unit 24 is controlled so that it matches the specified reference width, and the width of the plate width meter 10 is controlled in accordance with the reading instruction from the cooling system process control unit 400. 2 detected by the image sensor of each detection unit
read the two edge positions and send that information back to the cooling system process control unit 400'.

Width controller 310. Rough rolling controller 320
．． The finish rolling controller 330 and the strip width gauge controller 340 each incorporate an independent microcomputer, and each operate according to a preset program. Similarly, heating system process control unit 200.
The rolling system process control unit 300 and the cooling system process control unit 400 are also independent computer systems, and each operates according to a program set therein in advance.

In addition, the heating system process control unit 200. The rolling system process control unit 300 and the cooling system process control unit 400 are connected to a system control computer 100, thereby managing the overall operation. The system control computer 100 also includes a crop shear 12.
．． The operation of the side shear 13 and the end shear 14 is controlled, and the respective cutting positions on the steel material 7 are controlled. In addition, the third
Although not shown in the figure, the drive speed of the many conveyance rollers 3 and the operation of the turning table 4 are also controlled by the system control computer 1.
Controlled by 00.

Next, specific operations will be explained. First, the measurement of the plate width of the steel material 7 using the plate width meter IO will be explained.

Figures 4a, 4b, 4c, 4d, 4e,
4f and 4g show the operation of the cooling system process control unit 400. Figure 4a is the main routine,
Figures b and 4c are subroutines, and Figures 4d, 4e, 4f and 4g are interrupt processing routines. Also, Fig. 4d.

The interrupt processing in FIGS. 4e and 4f is performed by an internal timer of the cooling system process control unit 400.

4 m5ec, 20 m5ec and 100 respectively
It is periodically and repeatedly executed in response to an interrupt request generated every m5ec. The interrupt processing in FIG. 4g is performed by the straightening machine 9.
Substantially periodically, in response to an interrupt request that occurs every time the pulse generator 9c provided in executed repeatedly.

See Figure 4a. The cooling system process control unit is
When the power is turned on, first the step AI is initialized, that is, the internal memory is cleared.

It sequentially processes internal timer settings, interrupt mask settings, communication mode settings, etc., and enables subsequent operations. In step A2, a cooling system process control unit,
Devices connected thereto, namely the system control computer 100. Rolling system process control unit 300. A predetermined communication process is performed between the board width gauge controller 340 and the board width gauge controller 340.

In step A3, the system' control computer 100
, the reference plate width of the plate width meter 10, that is, the detection unit 23
It is determined whether there is a command to update the interval between the reference position of the detection unit 24 and the reference position of the detection unit 24. If there is such a command, in the first step A4, give a width setting instruction to the plate width meter controller 340. Upon receiving this instruction,
The board width meter controller 340 drives the 1-width setting mechanism 25.

Adjust the reference positions of the detection units 23 and 24.

Controls the spacing between those positions to match the specified width.

Next, the 4m5ec interrupt processing will be explained with reference to FIG. 4d. First, in step DI, in order to identify whether the board width meter 10 is in a measurable state, the board width meter controller 34
Read status information of 0. And step D2
Now, identify whether there is any abnormality in the status information. Specifically, the power of the board width meter IO is on, the current of the light sources 21 and 22 is normal, the temperature of the detection unit 20 is normal, the level of the image sensor output signal of the detection unit 23 is normal, and the detection unit 24 The output signal level of the image sensor is considered normal if it satisfies all of the following conditions.

If the status is normal, the process proceeds to step D3, where it is determined whether or not the positioning of the detection unit 23, 24 has been completed. The IE (relative position on the detection unit 23 = WS4) is read and stored in the memory, and then in step D5 the drive side steel edge position (relative position 1i:D on the detection unit 24) is read.
s4) and stores it in the memory, and then in step D6, counter CN4 is incremented (+1). Also, if counter CN4 exceeds 4, step D
8 clears CN4 to O. In other words, counter CN4
is 0 to 4 every time the board width information (WS4.DS4) is read.
will be updated sequentially within the range.

FIG. 5a shows the contents of the memory area for storing data stored by the process of FIG. 4d, that is, work side data WS4 and drive side data D sampled every 4m5ec by the process of FIG. 4d.
S4 is sequentially stored in five types of areas in association with the contents of counter CN4. Since this operation is repeated and the data is constantly updated, the latest 5 sampling results of WS4 and DS4 are always held in the memory shown in FIG. 5a.

Next, the 20m5ec interrupt processing will be explained with reference to FIG. 4e. First, in step E1, the tip detection flag F d
Check out the contents of et. When the tip of the steel material 7 has not reached the position of the plate width gauge 10, the flag F det is 0. In this embodiment, as shown in FIG. 6a, the steel material 7 is detected at both ends of the work side and the drive side. When the steel material 7 is conveyed beyond Pt and becomes an edge detection cloth in steps E2 and E3 of FIG. 4e, the tip detection flag F is set in step E4.
det is set to 1. However, if the detected board width is 70
If it is more than 0mm but not less than 4900mm,
Not considered as tip detection.

After detecting the tip of the steel material, each time this process is executed,
That is, step E5 is executed every 20 m5ec to process the data as follows. First, W of the memory shown in FIG.
The average value WS20 of the five data of S4 is determined and stored in the memory.Firstly, the average value DS20 of the five data of DS4 of the memory shown in FIG. 5a is determined and stored in the memory. In the next step E6, the counter CN20
Increment the contents of. However, if CN20 exceeds 4, CN4 is cleared to 0.

FIG. 5b shows the contents of the memory area that stores the data stored by the process in FIG. 4e, that is, the work side data WS20 and drive side data averaged and sampled every 20m5ec by the process in FIG. 4e. The data DS20 of each counter CN2
They are stored in sequence in five types of areas in association with the contents of 0. This operation is repeated and the data is constantly updated.

The memory shown in FIG. 5b always contains the latest W of the past five times.
The results of S20 and DS20 sampling are retained.

Referring again to Figure 4e. Work side data WS4
Or, when the edge is no longer detected in the drive side data DS4, it is assumed that the rear end of the steel material (Pb in Fig. 6a) has been detected, and the process proceeds from step E9 or EIO to step Ell, and the detection end flag F end is set to 1. At the same time, the leading edge detection flag F det is cleared to 0.

Next, the lOOm5ec interrupt processing will be explained with reference to FIG. 4f. In step F1, the tip detection flag F det
In step F2, the detection end flag F e is checked.
Check the status of nd. F det is 1, and F e
When nd is O, that is, when the steel material 7 is being detected,
Processing from step F3 onwards is executed.

In step F3, five average values of the data WS20 on the work side of the memory area shown in FIG. 5b are calculated as data wst.
In step F4, the five average values of the drive side data DS20 in the memory area shown in FIG. 5b are obtained as data DS100, and in step F5, these data are stored in the memory. Furthermore, in step F5, the contents of the register CNPI that holds position data are also stored in the memory.

In step F6, the contents of counter CN100 are incremented. Further, when the counter CN100 reaches the predetermined maximum value CN■ax, the detection end flag F end
Set to 1.

FIG. 5c shows the configuration of a memory area that stores the data group stored by the process shown in FIG. 4f.

That is, 1 sampled by the process of FIG.
Work side position data w S 100 and drive side position data D averaged every 00 m5ec
S100 includes position data CNPI in the transport direction,
Each of them is sequentially stored in a memory address corresponding to the count value of counter CN I OO at that time.

Next, the P1 interrupt processing will be explained with reference to FIG. 4g. When steel material 7 is not detected, that is, the tip detection flag F
When det is O or the detection end flag F end is 1, step G4 is executed to clear the register CNPI to 0, and while the steel material 7 is being detected, each time this process is executed,
Step G3 is executed to increment the contents of register CNPI.

Therefore, the contents of register CNPI are the tip position P of the steel material.
The distance from t to the plate width detection position is expressed by the number of pulses.

Next, refer to No. 4a@ again. When the measurement of the plate width is completed, that is, when the flag F end becomes 1, the process proceeds to step A6 after step A5.

In step A6, the data in the memory area shown in FIG. 5c is edited to create data in the memory area shown in FIG. 5d. That is, in the memory area shown in FIG. 5d, the width direction position wS of the work side and the width direction position MD of the drive side at each position of 100 mm in the conveyance direction on the steel material 7 are stored.
The data of S is stored. From the data in Figure 5c,
To convert to the data in Figure 5C, refer to the CNPI values in Figure 5C, and convert wstoo and DSloo of the item whose value is closest to each sampling position every 100 mm to W.
S and DS.

In the next step A7, various parameters regarding the planar shape of the detected steel material 7 are calculated and determined based on the data group stored in the memory area shown in FIG. 5d. The specific contents of the subroutine of step A7 are shown in FIG. 4b. Next, the contents of the plate width profile calculation process will be explained with reference to FIG. 4b.

In step Bl, the average value W Out t of the entire plate width of the steel material 7 on the exit side of the finishing rolling mill is determined using the first-order equation (1).

Wout = (1/n)Σ(W O+ Dvsi+ D
dgi) = (1) where, n: Number of data WO: Distance between detection units 23-24 Dvsi: Value of i-th WS (Figure 5d) Ddsi: Value of i-th DS (Figure 5d) Step In B2, the amount of deviation of the center position in the width direction of the steel material 7 from the reference position is determined every 100 mm in the conveyance direction. The calculation is performed using the following equation (2).

Wci = Wdgi − Wvsi” (2
) However, Wci: amount of deviation of the i-th center Wdsi: value of the i-th DS (Figure 5d) Wvsi: i
By determining the value of the th WS (Fig. 5d), that is, Wci over the entire length of the steel material 7, the locus We of the center position of the steel material 7 can be obtained as shown in Fig. 6b.

In step B3, side crops of the fR material 7 are identified. That is, when the steel material 7 after rolling is viewed in its plane, the sixth
As shown in Figure 6d, the width of the plate may be drum-shaped, with the leading and trailing ends being smaller than the center in the conveying direction, and as shown in Figure 6d, the width of the leading and trailing edges is smaller than that at the center in the conveying direction. In some cases, it becomes a drum shape with a wider plate at the rear end.
A side crop is a crop in the 0 width direction in which the portion that protrudes from the rectangle must be cropped and discarded.

Therefore, in step B3, first, the effective width Wk of the steel material 7 after rolling is determined. This is the board width W i at each measured position.
(WO+Dvsi+Ddgi: i = 1-n)
It is found as the minimum value among . And the next (3)
The side crop length CROP is determined from the formula.

CROP = (1/n)Σ(W i −W k )
(3) In Step B4, a parameter indicating the amount of deformation of the planar shape of the steel material 7 with respect to the rectangle is obtained.
The details of the crop taper process will be explained with reference to figure c.

In step C1, the average width Wt of the steady portion of the steel material is determined. In this example, the stationary part is L/2 of the total length of the steel material, excluding the length of L/4 at the tip and L/4 at the rear end.
It means the middle part of the length. Therefore, the average width Wt can be obtained from the following equation (4).

Wt = (1/n) Σ(W i )
...(4) However, the range of i is limited to the stationary part. In the next steps C2 and C3, the plate width W i (W O+ Dvsi+ Ddsi
) is sequentially referred to from the center in the conveyance direction toward the tip end, and the position where it is out of the permissible range is searched for. In this case, the permissible range of the plate width is within the range of Wt±ΔW. ΔW is 1, for example, about 20 mm.

If a position where the plate width is out of the allowable range is found, proceed to step C4, and find the distance between the position on the steel material 7 where the referenced plate width data was obtained and the tip of the steel material as the tip side crop taper length CPt. (See Figures 6f and 6g).

In the next steps C5 and C6, the plate width W i (W Q + Dvsi+ Dcl
si) is sequentially referred to from the center in the conveying direction toward the rear end, and a position where it is out of the permissible range is searched. The allowable range of the plate width in this case is within the range of Wt±ΔW.

If a position where the plate width is outside the allowable range is found, proceed to step C7, and calculate the distance between the position on the steel material 7 where the referenced plate width data was obtained and the rear end of the steel material to the rear end side crop taber length CPb. Find it as.

In step C8, the crop taper ratio RCT is determined using the following equation (5).

RCT= (CPt+CPb)/2L (5
) However, L: Total length of the steel material, that is, by determining the crop taper ratio RCT, it is possible to know how much the planar shape (trajectory at both ends in the width direction) of the steel material 7 after rolling is deformed with respect to the rectangle. .

Referring again to Figure 4b. When the crop taper process in step B4 is completed, the process first proceeds to step B5, where the amount of camber is calculated. In this example, the amount of camber is determined for a portion of the steel material 7 excluding the cropped area of 500 mm at the leading end and 500 mm at the rear end.

This will be explained with reference to FIG. 6h. The amount of deviation Wci of the X coordinate of the center position at each i-th measurement position in the conveyance direction of the actual steel material 7 from the measured center line in the width direction of the copper material is
2) It is determined by the formula. Assuming that the steel material bends in the same direction within the calculation range, the amount of camber is determined by the distance between each Wet and the reference line (y = ax + b) that connects the position of Wci at the tip and rear end of the steel material (excluding the cropped part). It can be determined as the maximum value. Furthermore, since the inclinations of the reference line and the trajectory of Wet with respect to the X-axis are relatively small, the distance between the reference line and Wci can be approximately determined as the deviation between the reference line and Wci in the y-coordinate direction.

In other words, the amount of camber is determined by the value of each Wci and the X of the reference line equation.
It is obtained by sequentially calculating the difference from the y-coordinate position obtained by substituting the X-direction position of the i-th measurement point into the coordinates for all Wci, and finding the maximum value among them.

In addition, the parameters a and b of the reference line equation (y = a x + b) are calculated by using the following equation (6) as the
It can be found by substituting the coordinates.

y-ys=(x-xt)(y2-yt)/(x2x1)
-(6) However, xl: X coordinate y of Wci at the rear end of the steel material
1: Y-coordinate of Wci at the rear end of the steel material xl: X-coordinate of Wci at the tip of the steel material y2: Y-coordinate of Wci at the tip of the steel material Also, the direction of one bend can be identified by checking whether the value of the camber amount is positive or negative. .

Furthermore, it is possible to divide one sheet of steel material into a plurality of regions and determine the amount of camber within each region. In this example, each area where the steel material is divided into 2m sections in the transport direction is also used.

I try to find the amount of camber in each case.

Referring again to Figure 4b. When the calculation of the amount of camber in step B5 is completed, the process proceeds to step B6, where the radius of curvature, which indicates the degree of bending, is calculated in the same way as camber.

The range of calculation is to divide the steel material into a large number of regions every 2 m in the conveyance direction, and for each divided region, the radius of curvature is determined based on the locus of the center in the width direction of the steel material, that is, Wci. .

The details of the specific calculation of the radius of curvature will be explained. here,
As a calculation example, as shown in FIG. 61.

The description will be made assuming that position data (a part of Wci) of nine points Wc1 to Wcg exist within the calculation range. In this embodiment, it is assumed that the center of the calculation range has the largest amount of curvature (b), and one data group Wc1 to Wc5 and the other data group Wc5 to Wc5 of the area divided with the center as a boundary. For each of W c g,
Find the regression line for them (y = c x
+ d, y = ex + f) m, that is, in the following equation (7), data Wc1 to Wc5 or Wc
By substituting the respective X and Y coordinate values of 5 to Wcg, two regression lines are obtained.

y-y=(x-x)Σ(xi x)(yi-z)/Σ
(xi-x)! ”(7) However, L = y-coordinate average of all data within the calculation range In order to calculate the curve using the X-coordinate average value method of all data within the calculation range, first, data at both ends of Wc1 and Wcg A reference line (y=gx+h) connecting these lines is determined. That is, the parameter g+h of the reference line is determined by substituting the coordinates of the data into the following equation (8).

y-ys = (x-xt) (y2-yt)/(X2
-xt) ...(8) However, yl: y of Wcl
Coordinate xl: X coordinate of Wc1 y2: Y coordinate of Wcg x2: X coordinate of Wcg Next, equation (9) is calculated to find the straight-line distance Q between Wc1 and Wcg.

Q” (X2 xt) + y 2
yt...(9) Also, find the coordinates X3*Ya of the midpoint Pc of the straight line connecting Wcl and Wag using the following equation (10).

X3 = (x2x t) / 2 ty3 = h1
2-yt)/2...(10)
Furthermore, a straight line (y=px+q) passing through the intermediate point Pc and perpendicular to the reference line (y=gx+h) is determined from the following equation (11).

y-73= (1/g)(x xa) ・
・(11) And the above two regression lines (y=cx+
d.

y==ex+f) with the larger slope and the above straight line (y
= px + q) at the intersection point Pz 41! Determining ext, yt 6 Next, the amount of one bend is determined from the following equation (12) based on the coordinates of point Pe and Pz determined by the above processing.

b” (xa-xa)”+(y4 ys)”・112
) Now referring to FIG. 61, R(1-Cosθ)=b.

2 R-5in OkiQ Therefore, the radius of curvature R is obtained from the following equation (13).

R = (j2''+4b)/(1-1/2k) - (13) However, is the intersection of the reference line (y=gx+h) with the one with the larger slope of the two regression lines, and the point Pz. indicates the distance.

As described above, the cooling system process control unit 400
In the plate width profile calculation process shown in Fig. 4b, various parameters related to the plate width are determined. (3) CROP) and crop taper ratio RCT are provided by the rolling system process control unit 30.
0, and information on the amount of camber and radius of curvature is also sent to the system control computer 100.

Next, the operation of the rolling system process control unit 300 will be explained. An overview of the processing of this unit 300 is given in the seventh section.
As shown in the figure. Roughly speaking, the characteristics of this process are that the amount of width expansion of the steel material due to finish rolling is automatically controlled based on the measured value of the rolling exit width so that it approaches the target width; Planar shape of steel material detected on the exit side of the rolling mill.

That is, the thickness pattern of the steel material during rough rolling is controlled based on CROP and RCT, and the planar shape of the steel material on the exit side of the rolling machine is controlled to approximate a rectangular shape.

First, regarding the former feature, the operation of the rolling system process control unit 300 will be specifically explained with reference to FIG.

In the set width correction calculation process in step 17, the target width of the plate width is corrected after the steel material is widened due to rolling. In other words, the initial target width is set to the center of the standard range, but for example, if the steel weight is less than the standard,
By keeping the width constant 1. The thickness and length may be affected and they may be out of specification. Therefore, the target width is corrected based on the weight of the steel material 7 actually measured by the weighing scale 1. Specifically, first find the weight excess/deficiency amount α from the following equation (14).

α=(Actual weighing weight/vI found weight)-1...(14)
Then, if α is 0 or more, the aim width is not corrected, but
If α is negative, the aim width is modified to be smaller by αXCI. However, the amount of correction shall be less than C2. In addition, C
1 and C2 are predetermined constants, which are registered in the memory in the form of a table for each type of steel material.

In the rough rolling width expansion prediction in step 18, the width expansion amount ΔBur of the steel material in the rough rolling process is determined.

Although other calculation methods may be considered, in this embodiment, the width expansion amount ΔB for each rolling pass, that is, for each pass, is determined by the following equation (15).

ΔB=BoXLdXΔh/ (n X HX Bo+
h X Ld) ... (15) However, Bo: Width of the plate at the entrance side of the rolling mill Ld: Projected contact arc length (ki f "τ below) Δh: Reduction amount (=H-h) n= (1,4X , /T door] II: Rolling machine entry side plate thickness h: Rolling machine exit side plate thickness R: Pressure roll radius In rough rolling, multiple passes of rolling are repeated in the 1st grade rolling mill 6, so each pass If the width expansion amount in the rough rolling process is ΔBi, then the width expansion amount ΔB in the rough rolling process is
tr can be determined as ΣΔB+.

On the other hand, in step 12, find the amount of width expansion of the steel material during the entire rough rolling process and finish rolling process. The width expansion amount of each pass in the finishing rolling mill 8 can be determined by substituting each parameter in finish rolling into the above equation (15), and the total width expansion amount ΔBtf of the finishing rolling process is the width expansion amount of each pass. It can be obtained as the sum of Therefore, the width expansion amount ΔBt in the entire rolling process is the sum of the width expansion amount in the rough rolling process and the width expansion amount in the finish rolling process, but since it actually includes an error, the error can be reduced by learning. Including the parameter Ofs of the learning term, the width spread amount ΔBt is determined by the following equation (16).

ΔBt=ΔBtr+ΔBtf+○fs −(16)
Here, the value of the learning term Ofs is allocated to a storage area in the form of a table on a readable/writable memory, divided by type of steel material and rolling temperature.

It is updated by the width spread amount learning process in step 11.

Specifically, in step 11, the actual width on the rolling entry side measured by the width gauge 5 placed on the entry side of the rough rolling mill,
Rolling exit side sheet width (Wouj) measured by sheet width meter 10
The difference between the actual width expansion amount determined by the difference between the width expansion amount and the predicted width expansion amount ΔBtr, that is, the error ΔWL, is calculated 1
The value of the learning term Ofs is updated using the following equation (17).

0fs= Ofs (1-C) + C・ΔWL・
-・(17) However, C: Smoothing coefficient Therefore, every time the rolling process is finished, the error between the actual measurement value and the predicted value of the width expansion amount is calculated, and based on that, the learning term O
Since fs is updated, the predicted value of the width spread amount used for control is corrected based on past learning and becomes very close to the actual width spread amount.

In step 13, the following equation (1B) is used based on the actual width on the rolling entry side measured by the width meter 5 placed on the entry side of the rough rolling mill, the width expansion ΔBe predicted in step 12, and the target width. The width excess/deficiency amount β is determined, and the target thickness is corrected accordingly.

β = (Actual width 10ΔBt)/Aim width - 1 (18)
The aim width is corrected as follows based on α in equation (14) and β in both equations.

When α-β≧0: Correct α- to increase the target thickness by CO・(α-β)
When β〈0: Modify the target thickness by C3・(α−β) In step 14, the predicted calculation of the width expansion amount is performed again based on the target thickness corrected in the process of step 13 described above. Let's do it.

In step 15, a control schedule for each pass in the finishing rolling mill 8 is set based on the width expansion amount calculated in step 14, and the rolling amount, etc. of the finishing rolling mill 8 is controlled in step 16 based on the schedule. .

Since the above-mentioned control is performed, in this embodiment, even if the width of the steel material deviates significantly from the target width at the exit side of the rolling process, the difference is detected by the strip width meter IO and is included in the learning term. The value Ofs is fed back and the finish rolling schedule is changed, so when rolling steel materials thereafter, correction control is automatically performed so that a sheet width after rolling close to the target width is obtained.

Next, regarding the latter feature, that is, controlling the rough rolling thickness pattern based on CROP and RCT,
The operation of the rolling system process control unit 300 will be specifically explained.

As shown in Fig. 8, when a steel material with a rectangular planar shape and a uniform thickness is finish rolled on the rough rolling exit side, the planar shape of the steel material on the finish rolling machine exit side is hour-shaped, that is, the tip and rear ends. There are cases where the plate width of the section is larger than that of the central part, and cases where the plate width of the drum-shaped, that is, the tip and rear end parts, is smaller than that of the central part. Therefore, in this embodiment, in the rough rolling process, thickness control is performed in which the thickness is adjusted for each position of the steel material to form a special thickness pattern, and the actual planar shape of the steel material on the exit side of the finishing rolling mill is detected. The detection results are fed back to the thickness pattern control of the steel material during rough rolling.

In other words, the amount of width expansion due to rolling changes depending on the amount of reduction, that is, the difference between the plate thickness on the rolling entry side and the plate thickness on the rolling exit side. In the case of a drum-shaped steel material as shown by the dashed line in the figure, if the thickness pattern of the steel material on the rough rolling exit side is made thicker at the tip and rear ends than in the center, it is possible to The width of the edges increases,
The planar shape of the steel material on the finish rolling exit side approaches a rectangle.

In addition, if the planar shape of the steel material on the finish rolling exit side is hourglass-shaped as shown by the solid line in Fig. 8, the thickness pattern of the steel material on the rough rolling exit side should be If the thickness is made smaller than that, the amount of width expansion of the leading and trailing ends of the steel material during finish rolling will be reduced, and the planar shape of the steel material on the exit side of the finish rolling will approach a rectangular shape.

In actual processing, the cooling system process control unit 4
The side crop amount CROP and crop taper ratio RCT obtained from 00 are learned, and the thickness pattern of the steel material in rough rolling is determined based on the past learning results.
Adjustments are made as shown in Figure a or Figure 9b. Each pressure adjustment parameter x 1 , FL shown in FIGS. 9a and 9b
TI and FLT2 are set according to the learning results.

Please refer to FIG. In step 21, learning regarding the side crop amount CROP is performed. In other words, the side crop learning value FDI is updated according to first-order equation (19) every time a new crop amount CROP is detected.

FDl=FD1(1-C)+CXCROP-...(
19) However, C: Smoothing coefficient Regarding this learning value FDI, a storage area is allocated in the form of a table on the readable/writable memory as shown in Fig. 9c. An independent storage area is allocated for each condition of the steel material type. Therefore, the learning results are saved for each operating condition.

Further, in step 22 of FIG. 7, learning regarding the crop taper ratio RCT is performed. In other words, the learning value CRI of the crop taper ratio is the new crop taper ratio RC.
Every time T is detected, it is updated according to the following equation (20).

CR1=CR1(1-CI) +CIXRCT...
・(20) However, C1: Smoothing coefficient Regarding this learning value CRI, as in the case of FDI,
A storage area is allocated in the form of a table, and independent storage areas are provided for each condition such as plate length after thickness adjustment, rolling temperature, and steel material type. Therefore.

The learning results are saved for each operating condition.

In step 19 of FIG. 7, a normal path schedule is set based on the predicted width expansion amount ΔBtr obtained in the process of step 18, and in step 21
Based on the learned value FDI obtained in step 22 and the learned value CRI obtained in step 22, schedule settings regarding the thickness pattern of steel materials are performed. Specifically, the following (2)
The parameters x 1 , FLTI, and FLT2 are determined from equations 1), 22), and 23, and the thickness of the steel material is adjusted as shown in FIG. 9a or 9b. If the planar shape on the finish rolling exit side is drum-shaped, the thickness pattern shown in FIG. 9a is set, and if the planar shape on the finish rolling exit side is drum-shaped, the thickness pattern is set as shown in FIG. 9b.

x 1 = (1/2) (FD 1 x k 1/target width) Steady part plate thickness -・- (21) FLT1 = Steel plate length XCRIXk2 ... (22)
FLT2 = Steel plate length XCRIXk3
...(23) However, kl, 2. In step 20 of FIG. 7, the rolling reduction amount of the rough rolling mill 6 is adjusted for each position of the m material according to the schedule set in step 19, and rough rolling is performed according to the set thickness pattern.

In this example, only the locus of both ends in the width direction of the steel material on the finishing rolling exit side is detected, and the thickness pattern in rough rolling is set so that the detected shape is linearly corrected. Both longitudinal ends of the steel material on the side,
In other words, if the contour shapes of the leading and trailing ends can be detected,
Its shape can also be modified linearly. That is, since the direction of the 1 m material can be turned in the rough rolling process, when it is reversed 90 degrees and rough rolling is performed in the width direction of the steel material, as in the case of the longitudinal direction described above,
By setting a special thickness pattern as shown in Figures 9a and 9b in the rolling direction (width direction), the amount of spread in the longitudinal direction of the steel material can be corrected, and the contours of the leading and trailing ends of the steel material can be made linear. It can be fixed.

By the way, the steel material 7 that has undergone the finish rolling, straightening, and cooling steps is cut into a plurality of regions by the end shear 14 along an axis substantially orthogonal to the longitudinal direction, and the cutting positions are determined by the system control computer 100. determined by The specific details of the process related to determining the cutting position will be described below.

The length of each of the plurality of pieces of steel material formed by cutting the steel material 7 is set in advance as a cutting length.

In this example, four cutting lengths are set to obtain four pieces of steel from one piece of steel, but the order in which the pieces of steel are arranged is not particularly determined.

In this example, the effect of one bend is minimized by optimally arranging the tR pieces based on information on bends in the steel material detected by measuring the sheet width profile after rolling. It's in control.

In other words, when the cutting lengths of each piece of steel material are different, each cutting position on the steel material changes by changing the arrangement of the steel material pieces, so it is possible to allocate the cutting position to a part where the influence of bending is small. Specifically, since the planar shape of each piece of steel material that becomes a product must be rectangular, the proportion of the part that must be discarded as side crops increases in areas with large bends. However, as shown in FIG. 10a, for example, continuous pieces of steel (7a,
7b) By tilting the pieces along the bend of the steel piece 7, the side crop caused by the bend can be reduced at the boundary between the two pieces of steel. Therefore, it can be seen that the influence of bending can be reduced by first setting a portion of the steel material with a small radius of curvature as the cutting position.

Also, if the radius of curvature of the steel material is uniform at any position,
As shown in FIG. TOB, it can be seen that the size of the side crop indicated by hatching is larger for the longer steel piece 7c than for the shorter steel piece 7d. Therefore, it is preferable to allocate a long piece of steel material to a part where the bend is as small as possible.

Therefore, in this example, for all combinations of the arrangement of steel pieces (type 01 when dividing into n pieces), a function indicating whether each combination is appropriate in terms of the influence of bending of the steel pieces on the side crop is calculated. The most favorable combination is selected based on the calculation results.

Two functions are used: a function f cut related to the radius of curvature of the cutting position shown in the following equation (24), and a function f dis related to the amount of camber in the steel piece shown in equation (25).

f cut = f c (R1) + f c (R2) +
f c (R3) + f c (R4) ・”・(
24) f dig = f d (C1) + f d (C
2) + f d (C3) + f d (C4)”
・(25) However, f c(x): Function indicating the influence of the radius of curvature CLC2, C3, C4: Calculate the amount of camber on each steel piece, that is, calculate f cut + f dis for all combinations, find the combination that minimizes the effect of bending, and set each cutting position on the steel piece according to that combination. decide.

In the above embodiment, the determination of the cutting position is explained when the lengths of the plurality of steel pieces to be cut are different from each other. (or products with variable length)
If a portion is provided and the position or length thereof is controlled to be adjusted, the cutting position can be changed as in the above embodiment.

The cutting position can be corrected to an optimal position with respect to bending.

[Effects] As described above, according to the present invention, the planar shape of the steel material on the rolling exit side is actually detected, and depending on the detection result,
Since the thickness pattern of the steel material rolled in the rolling process is automatically controlled, the planar shape of the steel material on the rolling exit side can be approximated to a rectangular shape, which reduces the size of the cropped area of the steel material and increases the yield. improves.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the configuration of the main parts of one type of rolling equipment for implementing the present invention. Fig. 2a is an enlarged side view showing the plate width gauge lO as seen in the conveying direction of the steel material 7, and Fig. 2b is the ub-
It is a ub line sectional view. FIG. 3 is a block diagram showing the configuration of an electrical component that controls the device shown in FIG. 1. Figures 4a, 4b, 4c, 4d, 4e,
4f and 4g are flowcharts showing the contents of the processing of the cooling system process control unit 400 of FIG. 3. FIG. 5a, 5b, 5c, and 5d are memory maps showing the configuration of data storage tables set on the memory of the cooling system process control unit 400. Figures 6a, 6b, 6c, 6d, 6e,
6f, 6g and 6j are plan views showing the whole or a part of the steel material 7, and FIGS. 6h and 61 are plan views showing the locus of the center position of the steel material in the width direction. FIG. 7 shows the rolling system process control unit 300 in FIG.
FIG. 2 is a block diagram showing the contents of processing. FIG. 8 is a process diagram showing the shape of the steel material at the rough rolling exit side and the finish rolling exit side before and after thickness pattern adjustment. FIGS. 9a and 9b are front views showing the thickness adjustment pattern, and FIG. 9c is a memory map showing the structure of the memory for storing FDI. FIGS. 10a and 10b are plan views showing the shape of one steel material and a piece of steel material cut from it. l: Weighing meter 2: Heating furnace 3: Conveyance roller 4: Rotating table 5: Width meter 6: Rough rolling mill (rolling means) 6e: Roll reduction device (rolling adjustment drive means) 6f: Pulse generator 7: Steel material 8: Finishing rolling mill 9: Straightening machine
9C: Pulse generator 10: Board width meter (output side board width detection means) 11: Cooling device 12: Crop shear 13:
Side shear 14 = end shear 20: detection section
21, 22: Light source 23. 24: Detection unit 23b, 23c: Reflection fi 23d: Imaging lens 23
e-One-dimensional CCD image sensor 25: Width setting mechanism 100 System control computer 200: Heating system process control unit 300: Rolling system process control unit (rolling control means)
400: Cooling system process control unit

Claims (2)

[Claims] (1) At least one rolling means arranged in the conveyance path of the thick steel plate; Rolling adjustment driving means for adjusting the rolling characteristics of the rolling means; Provided on the exit side of the rolling means, and controlling the thickness at the exit side of the rolling means Output side plate width detection means for detecting the plate width of the steel plate; and the plate width detected by the outlet side plate width detection means is repeatedly sampled at substantially constant distances in the conveying direction of the thick steel plate, and the sampled plate width information is obtained. process the group to calculate the shape parameters related to the distribution of plate width changes,
A rolling control means for controlling the rolling adjustment drive means according to the determined shape parameters, and adjusting a thickness setting pattern of the rolling means corresponding to each position in the conveyance direction on the thick steel plate; Side crop measuring device. (2) The rolling control means includes read/write memory means for storing learned values corresponding to the shape parameters, and adjusts the thickness setting pattern of the rolling means based on the learned values, and adjusts the thickness setting pattern of the rolling means based on the learned values, and adjusts the thickness setting pattern of the rolling means based on the learned values, and adjusts the thickness setting pattern of the rolling means based on the learned values. The side crop measuring device for a thick steel plate according to claim 1, wherein the learned value is corrected according to the parameter and the learned value.