JPH07195106A - Methods for controlling and measuring plate width of hot rolled stock, and device thereof - Google Patents

Abstract

PURPOSE:To provide a method and a device for measuring a plate width by which even when a width deviation on the inlet side of a vertical roll is large, a loop and buckling do not generate on a hot rolled stock, excellent accuracy is attained, and a plate width, a warp, etc., are precisely measured during the hot rolled stock is running. CONSTITUTION:The opening of a vertical roll, is dynamically controlled by using the measured value of a plate width on the inlet side of the vertical roll and the max, edge rolling reduction amt. obtd. based on material items of a hot rolled stock and the limit of an equipment capacity. A laser beam irradiates both sides of a running hot rolled stock, reflected light is collected, the reflected light is converted into a distance value after received light by a two-dimensional image sensor, and then the converted distance is processed by an arithmetic unit. Thus, horizontal distances from the emission reference surface of the laser beam to both side surfaces of the hot rolled stock, are obtained. Based on the obtained horizontal distances, an average plate width, the maximum plate width and the curved shape of surfaces on both sides of the hot rolled stock, are obtained. Further, this method is for controlling the plate width of a hot rolled stock by using a plate measured value obtained by using a plate width measuring device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip width control method for strip hot rolled metal, and a strip width measurement method and apparatus.

[0002]

2. Description of the Related Art Conventionally, as an automatic strip width control method for hot rolled material, the strip width measurement value of the hot rolled material measured by a strip width measuring device on the vertical roll entrance side and Using a width expansion model that estimates the width expansion of the material formed by rolling with a horizontal roll arranged downstream, so that the plate width on the exit side of the horizontal roll becomes a target value. Vertical
There is a method of controlling the opening degree of the valve.

For example, Japanese Patent Laid-Open No. 62-127111 discloses a rolling schedule and a strip width pattern on the vertical roll entering side.
A typical strip width prediction pattern is selected from those stored in advance, the strip width on the vertical roll entry side of the representative strip width prediction pattern is compared with the measured entry strip width, and the difference is calculated. Is detected to correct the representative plate width prediction pattern, the opening of the vertical roll is determined based on the corrected pattern, and the plate width prediction value on the horizontal roll exit side is set to the target value. In addition to the above, there is described a technique (hereinafter referred to as prior art 1) in which the representative strip width prediction pattern is automatically learned from the measured value of the output strip width as a control result. Therefore, in this technique, the vertical roll opening is determined based on the actual measurement value and the predicted value of the plate width on the vertical roll entry side by the width expansion model.

Further, Japanese Patent Laid-Open No. 3-165911 discloses a vertical roll.
Measure the board width on the roll entry side and its temperature, find the width spread by the horizontal roll based on these measured values, and check the vertical roll based on this width spread and the target value on the horizontal roll exit side. -A technique to obtain the target strip width on the outlet side, detect the vertical roll load and return, and adjust the opening of the vertical roll so as to obtain the target strip width on the vertical roll outlet side. (Hereinafter, referred to as Prior Art 2)
Is listed. Therefore, in this technique, the vertical roll opening is determined by the measured value of the plate width on the vertical roll entry side and the plate width setting target value on the vertical roll exit side obtained using the width expansion model. Will be done.

Next, in hot rolling of a steel material or the like, the width of the hot rolled material such as a hot slab and a rough bar or a steel sheet rolled from the hot slab (hereinafter referred to as "sheet width") is determined by the running of the hot rolled material. There are two types of continuous measurement methods, a non-contact method (optical method) and a contact method, but the method that is generally put into practical use is the former non-contact method.

As an optical plate width measuring method, for example, there is a technique described in Japanese Patent Laid-Open No. 58-96204 (hereinafter referred to as Prior Art 3). In the strip width measuring device disclosed in the prior art 3, a light source is disposed below the rolling mill and an image sensor is disposed above the rolling mill, and while the hot-rolled material is passing through the rolling mill, It is intended to measure the width of a plate based on the shadow length of the light beam emitted from the light source in the plate width direction by the material to be rolled.

[0007]

However, in the conventional method for controlling the strip width of the hot rolled material, the method for adjusting the opening degree of the vertical roll is, as described above, in the prior art 1, the vertical roll is adjusted. Depending on the difference between the actual measured value of the strip width on the entry side and the predicted value of the strip width on the entry side (target strip width) obtained by the strip width prediction pattern (width expansion model), the prior art In 2, the vertical roll opening is determined by the difference between the measured value of the plate width on the vertical roll entry side and the set target value of the plate width on the vertical roll exit side obtained by the width expansion model. It In any case, the opening of the vertical roll is adjusted so as to cancel the difference. Therefore, the larger the difference between the measured strip width and the expected strip width or the target strip width, the more the opening of the vertical roll is narrowed down. There was a risk that bending would occur and normal rolling would become difficult. Further, in order to avoid this danger, there is a problem that the gain of an automatic plate width control (hereinafter, referred to as AWC (Automatic Width Control)) device cannot be made large, which hinders improvement of plate width accuracy.

Further, in the conventional width measuring device for hot rolled material, in Prior Art 3, since the width is obtained from the shadow length of the rolled material as described above, the maximum value of the width Only can be measured.

FIGS. 7 to 9 are views showing vertical cross-sectional shapes of ordinary hot-rolled material 1. Thus, the hot rolled material 1
The cross-sectional shapes of the side surface and the surface in the vicinity thereof are not necessarily rectangular as shown in FIG. 7, and variously change depending on the rolling conditions in the previous process. Therefore, when obtaining the strip width of the hot rolled material, it is necessary to apply various corrections to the apparent strip width obtained from the shadow length and the like according to the side shape thereof, and therefore, complicated Requires signal processing.

Further, in the case of a hot rolled material, the measured values vary due to the vertical behavior caused by the warp of the hot rolled material running on the rolling line, and the side shape of the material may be complicated. Therefore, there is a problem that the plate width measurement accuracy is poor even if various corrections are performed. Also,
Since measurement becomes difficult in an environment where water vapor and water droplets accumulate, there is a problem in measurement near the exit side of the rolling mill.

Therefore, an object of the present invention is to prevent the hot-rolled material from being looped or buckled even when the width deviation (difference between the actually measured width and the target width) on the vertical roll entry side is large. Providing a strip width control method that does not occur, and the average strip width, the curved surface shape and the warpage of the strip side face while the hot-rolled material is running, regardless of the measurement environmental conditions such as water vapor, An object of the present invention is to provide a plate width measuring device that can perform accurate measurement.

[0012]

According to the strip width control method of the present invention of claim 1, the strip width is newly measured to the strip reduction amount obtained from the inlet side width deviation of the vertical roll which is the conventional technique. The vertical roll opening is adjusted in consideration of the quality of the rolled product which is affected by the value and material specifications, and the limit value suitable for the rolling of the rolling line. In addition, claim 4 is,
The plate width is measured by using the plate width measuring device according to the present invention, and the details are as follows.

A plate width measuring device is arranged on the entrance side of the vertical roll,
Sheet width measured value of the hot rolled material measured by the sheet width measuring device, and of the hot rolled material formed by rolling with a horizontal roll arranged downstream of the vertical roll. Using a width expansion model that predicts the width of the plate width, a plate width that adjusts the vertical roll opening so that the plate width of the hot rolled material on the exit side of the horizontal roll becomes a target value. In the control method, the plate width measured value of the hot rolled material on the vertical roll entrance side measured by the plate width measuring device, based on the material specifications of the hot rolled material and the facility capacity limit, Calculate the maximum value of width reduction (called maximum width reduction) that does not cause looping or buckling of the material due to plate width reduction by vertical rolls, and calculate the width based on the maximum width reduction. With the reduction control amount as the upper limit of the AWC control amount, the opening degree of the vertical roll is dynamically changed. Those having features to be adjusted.

According to the strip width control method of the present invention as defined in claim 2, the hot-rolled material running is interposed between the strips in the strip width direction.
The laser beam is applied to both side surfaces of the hot rolled material, the reflected light is collected by a condenser lens, and the electric signal obtained by receiving the light by a two-dimensional image sensor is obtained. Converted to a distance value, the distance value is processed by an arithmetic unit to obtain the horizontal distance from the emission reference plane of the laser beam to the both side surfaces of the hot rolled material, and the hot rolled material It is characterized in that the average plate width, the maximum plate width, and the curved surface shapes of the both side surfaces are obtained. The device of this invention is
One two-dimensional laser range finder is arranged opposite to each other on both sides of the hot rolled material in the strip width direction, and the two two-dimensional laser rangefinders measure the horizontal distance to the hot rolled material. Then, based on the value obtained by subtracting the sum of those distances from the distance between both two-dimensional lasers and rangefinders, the average value of the strip width of the hot rolled material, the maximum value of the strip width,
Also, the curved surface shape of the side surface of the plate is obtained, and the details are as follows.

According to a third aspect of the present invention, there is provided two strip width measuring devices arranged on both sides of a running hot rolled material in the sheet width direction so as to face each other with the hot rolled material in between. Dimensional laser range finder, a range finder unit for converting an electric signal sent from the two two dimensional laser range finder to a distance value, and an electric signal sent from the range finder unit Then, it has a calculation unit for calculating the plate width and the curved surface shape of the side surface of the hot rolled material.

A strip width control method of the present invention according to claim 4 is characterized in that the strip width measuring device according to claim 3 is applied to the strip width control method for a hot rolled material according to claim 1. I have.

[0017]

Next, the vertical width determined based on the amount of width expansion predicted using various conventional width expansion models.
With respect to the tightening amount of the roll, in the plate width control method of the present invention, with respect to the width reduction control amount, the plate width measured value of the material on the vertical roll entry side, the material specifications such as the plate thickness and the temperature are used. A constraint was added that the upper limit value is the vertical roll tightening amount within the limit that does not cause looping and buckling of the material and within the facility capacity limit. Therefore, according to the conventional method, it is possible to prevent the occurrence of material loop and buckling that may occur when the entrance side width deviation is large.

FIG. 1 is a diagram for explaining the concept of a method for determining a limit value for a vertical roll tightening amount (width reduction control amount or AWC control amount) according to the method of the present invention. In the figure,
The horizontal axis represents time, and the vertical axis represents the plate width on the vertical roll entry side and the vertical roll opening. As the difference between the measured value and the target value of the strip width on the vertical roll entry side (hereinafter referred to as the entry side width deviation) increases, the vertical roll opening is tightened in order to cancel the increasing tendency of this difference. If the inclusion amount is increased and exceeds a certain allowable amount determined by the material specifications, the material will be looped or buckled. In the figure, the facility capacity is always within the allowable range.

In the figure, the vertical roll opening lines of the straight lines p and q shown by the thick lines are obtained by the method of the present invention, and the portion of the straight line r shown by the thin lines is outside the range of the method of the present invention. The vertical roll opening line is shown. When the absolute value of the tightening amount (negative) of the vertical roll opening is increased with time (when it goes downward on the vertical axis), the straight line q is the boundary line of the buckling or / and the loop generation region. At the point P intersecting with, the area reaches a hatched area indicating the occurrence of loop and / or buckling, so if the opening degree is tightened according to the straight line r, loop and / or buckling occurs in the material. Therefore, in order to avoid this, after the point P, the opening is changed to the opening indicated by the straight line p.

As described above, the direction in which the vertical roll opening is tightened and the direction in which the plate width is reduced are the negative directions of the vertical axis in FIG. That is, A
The WC control amount and the width reduction amount have negative values.

The vertical roll opening is expressed by the following equation (1), [vertical roll opening] = [vertical roll preset opening] + [AWC control amount]-(1). Here, the AWC control amount is the following (2)
Formula [AWC control amount] = [inlet side width deviation] × [AWC control gain] − (2) Further, the width reduction amount is represented by the following formula (3),-[width reduction amount] = [entrance side width]-[vertical roll opening]-(3), and the vertical roll amount of the formula (3)- Equation (1) is substituted for the valve opening, and the following equation (4) is used:-[width reduction amount] = [entrance width]-[vertical roll preset opening]-[AWC control amount]-(4) Then, the equation (4) is modified to obtain the following equation (5): [AWC control amount] = [entrance width]-[vertical roll preset opening] + [width reduction amount]-(5) Can be obtained.

In the present invention, (3) and (4)
The absolute value of the width reduction amount (negative) in the formula is the line indicating the entrance side width (hereinafter referred to as the entrance side width line. The same applies to the other) and the vertical roll opening degree in FIG. This is equivalent to the absolute value of the difference from the line, and the absolute value of the AWC control amount (negative) in the equation (5) is the vertical value after the point P (in the increasing direction of the horizontal axis).
By setting the absolute value of the difference between the preset preset opening line and the vertical roll opening thick line (straight line p), the material loop or /
And buckling does not occur.

As described above, the maximum value of the width reduction amount at which no loop or buckling occurs in the material, that is, the maximum width reduction amount corresponds to the left side of the equation (4):-[width reduction amount], On the other hand, in the figure, the vertical roll opening thick line (straight line p) is on the right side of the point P.
Is achieved by adopting the absolute value of the difference between the input side width line and the vertical value of the vertical roll opening thin line (straight line q) on the left side of the point P. It Therefore, when formulas (4) and (5) are applied to the present invention, the following formulas (6) and (7) are used:-[maximum width reduction amount] = [entrance side width]-[vertical roll preset opening degree] ]-[AWC control amount]-(6) [AWC control amount] = [entrance width]-[vertical roll preset opening] + [maximum width reduction amount]-(7) is obtained.

Next, the plate width measuring method and apparatus of the present invention will be described. Two one-dimensional laser distance meters are installed facing each other on both sides in the plate width direction of the hot rolled material traveling on the roller table with the hot rolled material in between. It A two-dimensional laser rangefinder has a laser light generator and two
It consists of a dimensional image sensor, diffuses the laser light from the laser generator in a slit shape and irradiates it on the material surface, where the laser light diffusely reflected is captured by the condenser lens, Light is received by a two-dimensional image sensor in which a large number of detection elements are arranged vertically and horizontally. The laser light received by the two-dimensional image sensor is converted into an electric signal and sent to the range finder unit,
Converted to a distance value. The distance value thus measured is sent to the arithmetic unit as an electric signal, and the plate width and the curved surface shape of the plate side surface of the hot rolled material are obtained.

In the arithmetic unit, the average value of plate width (referred to as average plate width) and the maximum value of plate width (referred to as maximum plate width) are obtained as follows. Fig. 2 shows the average plate width and the maximum plate using two-dimensional laser rangefinders 3-1 and 3-2, one on each side of the hot rolled material 1 on both sides in the width direction. FIG. 6 is an explanatory diagram for obtaining a width, and is a vertical cross-sectional view of the hot-rolled material 1 in a direction perpendicular to the traveling direction. And
The various symbols in the figure are as follows. LD (i), i = 0,
1, ─, n-1, n: left side laser beam distance from the reference plane to the plate side, LF (i), i = 0,1, ─, n-1, n: right side laser The-
Distance from the ray emission reference plane to the plate side surface, Wh: Distance between the left and right lasers and ray emission reference plane, Wmax: Maximum sheet width,
Wave: Average board width.

The minimum value of LD (i) + LF (i), i = 0,1,-, n-1, n is represented by (LD (i) + LF (i)) _min , and L
The arithmetic mean value of each group of D (i), i = 0,1, ─, n-1, n and LF (i), i = 0,1, ─, n-1, n, In terms of LDave and LFave, the maximum plate width (Wmax) and the average plate width (Wave) can be calculated by the following formulas. Maximum plate width: Wmax = Wh- (LD (i) + LF
(i)) _min , average plate width: Wave = Wh- (LDave + L
Fave). Since the average plate width can be measured in this manner, the plate width accuracy is improved by adjusting the vertical roll opening based on the width expansion model.

Further, since the distance from the laser beam emitting reference plane of the two-dimensional laser range finder to the point (n + 1) on the side surface of the running hot rolled material is measured, The curved surface shape of the side surface is required. Therefore, for example, it is possible to detect the abnormality of the material such as the detection of the opening of the rough bar. Also,
Since the two-dimensional image sensor is used, it is possible to measure the laser reflected light not only from the side surface of the hot rolled material but also from a position slightly above the side surface to the upper surface and the lower surface.
Therefore, it is possible to cope with an abnormal vertical movement that occurs when the hot rolled material is running.

[0028]

EXAMPLES Next, the present invention will be described based on examples. [Embodiment 1] FIG. 3 is a block diagram showing an embodiment of the plate width control method of the present invention, in which the thick line block is a characteristic part of the present invention and is a thin line which is a conventional normal AWC processing method. The block of the thick line is added to the block of the part.

First, the maximum width reduction amount that does not cause a problem in terms of material quality and passage and is allowable in equipment is determined. This is a fixed value, a limit value that can be tolerated for facility capacity,
Expressed as the minimum value of the loop width that does not occur in the material obtained from the function of plate width and temperature and the limit value that does not cause buckling of the material that is obtained from the function of plate thickness and temperature be able to. Then, this minimum value is set to a negative value by polarity conversion.

On the other hand, in the equation (5), the AWC control amount (negative)
Is calculated dynamically, and this value is compared with the value after polarity conversion (negative), and the larger value (the smaller absolute value) is calculated as the maximum width reduction amount in the formula (7). To obtain the [AWC control amount] (negative) on the left side. On the other hand, the AWC control amount (negative) according to the conventional method is defined as the entrance side width deviation x AWC
Gain x (∂w _E / ∂w ₀ ) is calculated, the two are compared and the larger value (the smaller absolute value) is adopted as the value of the AWC control amount, and the vertical roll opening is adjusted. Here, ∂w _E / ∂w ₀ is an influence coefficient, w _E is the tightening adjustment amount of the vertical roll opening, w ₀ is the vertical roll entrance side width deviation, and The adjustment amount of the vertical roll opening for setting the width on the horizontal roll exit side to the target value with respect to the roll deviation on the roll entrance side is shown.

The strip width measuring device according to the present invention is installed on the inlet side of the vertical roll of the fourth rough rolling mill of the continuous hot strip rolling line, and the strip width average value of the hot rolled material is measured by this. .
Then, using that value, the width deviation on the vertical roll entry side is obtained,
The AWC control amount is obtained by the above-described method of the present invention and the conventional ordinary method (hereinafter, referred to as a comparison method), and then the "maximum width reduction amount" of the method of the present invention is determined to open the vertical roll. The degree was adjusted.

FIG. 4 shows the width deviation on the vertical roll entering side in this embodiment, the AWC control amount obtained by the conventional method,
AWC controlled variable obtained by the method of the present invention, and
It is a graph which shows the change of the vertical roll opening adjustment amount by the method of this invention with respect to elapsed time. As is clear from the figure, the entry deviation of the vertical roll increases with the lapse of time in a monotonically increasing pattern, and correspondingly, the AWC control amount by the conventional method also monotonically increases. If the vertical roll opening is adjusted by the conventional method, the opening will be tightened more and more. On the other hand, according to the method of the present invention, the AWC control amount initially increases, but from a certain point, it does not increase even if the width deviation increases, and the tightening amount of the vertical roll opening (A
The WC control amount) is relatively small, and the tightening amount decreases after a certain period. As described above, when the vertical roll opening was adjusted by the method of the present invention, the material was not looped or buckled, and the plate width reduction was sufficiently controlled.

[Embodiment 2] FIG. 5 shows a method of controlling the strip width according to the present invention by using two rough rolling mill stands, namely No. 3 and N.
o.4 Rough rolling mill stand (hereinafter, the vertical roll and horizontal roll of each stand are E3, R3 and E4, R
4), and further, when the present invention is implemented by installing the plate width measuring device of the present invention on the entrance side of E3, a control system diagram illustrating a method for controlling the vertical roll opening. It is a summary. Referring to the figure, the strip width was measured by a strip width measuring device installed at the entrance side of E3 of the No. 3 rough rolling mill stand (the rear surface of No. 2 rough rolling horizontal roll (referred to as R2)). , E.3 and E so that the strip width becomes the target value on the exit side (the exit side of R4) of the rough rolling mill stand.
An embodiment in which the opening degree of 4 is modified will be described. The plate width measuring device was installed on the entrance side of E3.

First, a method of adjusting the opening degree of E3 will be described. First, the measured value of the plate width on the E3 entrance side (E
3 measured width on the inlet side) and the preset opening of R3 and R4 and the preset opening of E3 and B4.
The expected width on the delivery side) was calculated ((A) in the figure).

Next, the R4 exit side expected deviation is calculated by R4 exit side expected width-R4 exit side target width, and the width reduction sharing ratio of E3 to the sum of the width reduction amounts by E3 and E4 and the width reduction of E3 are calculated. Using the efficiency, the correction amount of the vertical roll opening to be executed in E3, that is, the correction amount to be added to the preset opening of E3 (hereinafter, referred to as E3 opening correction amount 1) is described in the following (8 ), [E3 opening correction amount 1] = {(R4 expected deviation at delivery side) × width reduction share of E3} / width reduction efficiency of E 3 (8) (calculated by (B) in the figure) ).

E3 opening correction amount 1 calculated by the above equation (8)
Is equivalent to the AWC control amount of the following formula (4):-[width reduction amount] = [entrance width]-[vertical roll preset opening]-[AWC control amount]-(4) Since Eq. (4) is applied to the width reduction by E3, the E3 opening correction amount 1
To the AWC control amount of the equation (4), and the corrected width reduction amount (referred to as the E3 opening correction width reduction amount) is expressed by the following equation (9):-[E3 opening correction width reduction amount] = [E3 entrance side actual width measurement value]-[E3 preset opening degree]-[E3 opening degree correction amount 1] --- (9).

Accordingly,-[E3 opening correction width reduction amount]
It was determined that the (positive value) does not exceed the maximum width reduction amount (referred to as E3 maximum width reduction amount) obtained by the method of the present invention. That is,-[E3 opening correction width reduction amount] is E3
When the maximum width reduction amount is not exceeded (YES in the figure)
Is not likely to cause loops or buckling of the material, so E
As the correction amount of the vertical roll opening of No. 3, the E3 opening correction amount of 1 of the above formula (8) was directly adopted. On the other hand, when-[E3 opening correction width reduction amount] exceeds the E3 maximum width reduction amount (N in the figure,
In the case of O), it is necessary to set the width reduction amount by E3 to the E3 maximum width reduction amount in order to prevent the material from looping or buckling. Therefore, the opening correction amount of E3 (hereinafter, In order to obtain the E3 opening correction amount 1 ′, the above equation (7) may be applied, and the following equation (10), [E3 opening correction amount 1 ′] = [E3 entrance side measured width] − [E3 Preset opening] + [E3 maximum width reduction amount]-(10) Therefore, the final opening correction amount of E3 was obtained by the equation (10) ((C) in the figure). The maximum width reduction amount is obtained by the method described in the second embodiment.

Next, a method for adjusting the opening degree of E4 will be described. Basically, in the above-described opening degree adjusting method for E3, the opening degree adjusting method for E3 is applied to E4. The details will be described below. An estimated width on the R4 outlet side (referred to as an R4 outlet side expected width) is obtained by using a width expansion model from the actual measured plate width on the E3 inlet side, the preset opening degrees of R3 and R4, and the preset opening degrees of E3 and B4. Next, the R4 exit side expected deviation is calculated by R4 exit side expected width-R4 exit side target width, and the E4 width reduction share ratio to the sum of the width reduction amounts by E3 and E4, and
Using the width reduction efficiency of E4, the correction amount of the vertical roll opening to be executed in E4, that is, the correction amount to be added to the preset opening of E4 (hereinafter, referred to as E4 opening correction amount 1) is used. ,
The following formula (11) is used: [E4 opening correction amount 1] = {(R4 exit side expected deviation) x width reduction sharing ratio of E4} / width reduction efficiency of E4-(11).

The E4 opening correction amount 1 calculated by the above equation (11) is expressed by the following equation (4):-[width reduction amount] = [entrance width]-[vertical roll preset opening]- [AWC control amount] Since it corresponds to the AWC control amount of (4), in order to apply the formula (4) to the width reduction amount by E4, the E3 opening correction amount 1 or the E3 opening correction amount is corrected. Using the amount 1 ′, the E4 entrance side width expected value is obtained using the width expansion model, and is substituted into the entrance side width of the equation (4) to obtain the corrected width reduction amount by E4 (hereinafter, E4 The width reduction amount after the opening correction) is expressed by the following formula (12):-[E4 opening correction width reduction amount] = [E4 entrance side expected width value]-[E4 preset opening amount]-[E4 opening correction amount] 1] It can be obtained by (12).

Therefore,-[E4 opening correction width reduction amount]
The (positive value) was determined so as not to exceed the maximum width reduction amount (E4 maximum width reduction amount) obtained by the method of the present invention. That is, when-[E4 opening correction width reduction amount] does not exceed the E4 maximum width reduction amount, there is no possibility of looping or buckling of the material, so the vertical roll opening amount of E4 As the correction amount, the E4 opening correction amount 1 of the above formula (11) was directly adopted. On the other hand, when-[E4 opening corrected width reduction amount] exceeds the E4 maximum width reduction amount, the width reduction amount by E4 is defined as the E4 maximum width reduction amount in order to prevent material looping and buckling. Therefore, it is necessary to apply the equation (7) to obtain the E4 opening correction amount (hereinafter referred to as the E4 opening correction amount 1 '). Opening correction amount 1 ′] = [E4 entrance side width expected value] − [E4 preset opening] + [E4 maximum width rolling reduction]-(13) Therefore, the final opening correction amount of E4 was obtained by the equation (13). The E4 maximum width reduction amount is obtained by the method described in the second embodiment.

As described above, the strip width on the entry side of the intermediate stand of the rough rolling mill can be accurately measured, and the material loop and buckling due to the excessive tightening of the vertical roll opening can be obtained. It was possible to obtain a large AWC control gain without generating it, and it was possible to accurately adjust the opening degree of the vertical roll.

[Embodiment 3] FIG. 7 is a diagram showing the overall construction of an embodiment of the plate width measuring device of the present invention. The plate width measuring device and the measuring method of the present invention will be further described based on FIG. In the hot rolling process, the high-temperature hot rolled material 1 conveyed on the roll lathe 2 is the roll lathe 2 on the outgoing side of the horizontal roll (not shown) of the rough rolling mill. Two-dimensional laser range finder 3-1 installed on each side with a space between them,
Between 3-2, it is conveyed by a rollable table 2 and inserted into a vertical roll (not shown) of the next rough rolling mill. The two-dimensional laser rangefinders 3-1, 3-2 are laser generators 4-1, 4-2 for irradiating the side surface of the hot rolled material 1 with laser light.
And the laser light 9b reflected from its side surface is received 2
Dimensional image sensors 5-1 and 5-2 are provided. The two laser generators 4-1 and 4-2 are the lasers emitted from them.
The slit light 9a of the light is horizontal light perpendicular to the line direction of the rollable table 2, and yet the side thickness of the hot rolled material 1 can be sufficiently covered. Is designed to.

Two-dimensional image sensors 5-1 and 5-2 are provided with a condenser lens for capturing the laser beam 9b diffusedly reflected on the side surface of the hot rolled material 1. In this way, the rangefinder units 6-1 and 6-2 for receiving the collected and measured signals and converting them into the range values are provided by the two-dimensional laser rangefinders 3-1 and 3-. 2 connected to the distance measuring unit 6-1, 6 while
-2 receives the signal sent from -2, and the calculation unit 7 for calculating the maximum strip width, average strip width and curved surface shape of the strip side of the hot-rolled material 1 becomes the range finder units 6-1 and 6-2. It is connected. Furthermore, regarding the upper and lower surfaces near the side surface of the hot rolled material 1, from the characteristics of the two-dimensional laser rangefinders 3-1, 3-2,
Since it may be difficult to measure, it is possible to set the measurement range in the thickness direction arbitrarily by setting the plate thickness from the host computer 8. Further, in order to avoid deterioration of measurement accuracy due to water vapor, water drops, etc., a means for removing singular points and a smoothing treatment means are provided. As a result of measuring the strip width of the hot rolled material 1 with the strip width measuring device of this example, the average strip width and the maximum strip width were measured with high accuracy, and the curved surface shape of the side surface could be accurately obtained. .

[0044]

As described above, according to the present invention,
Even if the vertical roll-in side width deviation is large, the AWC control gain can be increased without causing looping or buckling of the material, and the strip width accuracy can be improved. Even in a bad environment where water vapor or water drops can accumulate, it is possible to accurately measure the strip width, strip width average value, strip side curved surface shape and warpage of running hot rolled material, which is an industrially beneficial effect. Be brought.

[Brief description of drawings]

FIG. 1 is a diagram for explaining the concept of a method for determining a limit value for a vertical roll tightening amount according to the method of the present invention.

FIG. 2 is an explanatory diagram for obtaining a plate width by the plate width measuring device of the present invention.

FIG. 3 is a block diagram showing an embodiment of a plate width control method of the present invention.

FIG. 4 is a graph showing an example of changes over time in the vertical roll opening adjustment amount according to the plate width control method of the present invention.

FIG. 5 is a summary of a control system diagram for explaining a method of adjusting the vertical roll opening when the plate width measuring device and the plate width control method of the present invention are simultaneously carried out.

FIG. 6 is an overall configuration diagram showing one embodiment of the plate width measuring device of the present invention.

FIG. 7 is a view showing a desirable shape of a vertical cross section of a hot rolled material.

FIG. 8 is a diagram showing an example of a vertical cross-sectional shape of a hot rolled material.

FIG. 9 is a diagram showing another example of the vertical cross-sectional shape of the hot rolled material.

[Explanation of symbols]

 1 Hot rolled material, 2 Rollable, 3-1, 3-2 Two-dimensional laser distance meter, 4-1, 4-2 Laser light generator, 5-1, 5- 2 Two-dimensional image sensor, 6-1 and 6-2 Distance meter unit, 7 arithmetic unit, 8 host computer.

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 16, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

Front Page Continuation (72) Inventor Masaaki Yamamoto 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Kengo Kuraoka 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo In-house (72) Inventor Issei Nakanishi 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd. (72) In-house Fumitoshi Murakami 1-2-1 Marunouchi, Chiyoda-ku, Tokyo

Claims (4)

[Claims] 1. A strip width measuring device is arranged on the entrance side of the vertical roll, and a strip width measurement value of the hot rolled material measured by the strip width measuring device and a strip width measuring device are arranged downstream of the vertical roll. Horizontal roll
Using a width expansion model that predicts the spread of the plate width of the hot rolled material formed by rolling with
In the plate width control method of controlling the opening of the vertical roll so that the plate width of the hot rolled material on the exit side of the horizontal roll becomes a target value, the method on the vertical roll entrance side Based on the strip width measurement value of the hot rolled material and the material specifications and equipment capacity limit of the hot rolled material, the maximum width reduction without loop or buckling of the hot rolled material is determined. A plate of hot-rolled material, characterized in that the opening of the vertical roll is dynamically controlled, with the upper limit value being the width reduction control amount calculated based on the obtained maximum width reduction amount. Width control method. 2. The running hot-rolled material is sandwiched between the two sides of the hot-rolled material toward both sides of the hot-rolled material.
Irradiate the light beam, collect the reflected light with a condenser lens,
Then, the electric signal obtained by receiving the light with the two-dimensional image sensor is converted into a distance value, and the obtained distance value is processed by the arithmetic unit, so that the heat from the emission reference plane of the laser beam is changed. It is characterized in that the horizontal distance to the both side surfaces of the hot rolled material is obtained, and based on the obtained horizontal distance, the average sheet width, the maximum sheet width and the curved surface shapes of the both side surfaces of the hot rolled material are obtained. , Method for measuring strip width of hot rolled material. 3. Two two-dimensional laser rangefinders arranged facing each other with the hot-rolled material in between on both sides of the running hot-rolled material in the strip width direction; Range unit for converting an electric signal sent from a two-dimensional laser range finder to a distance value, and a plate width of the hot rolled material by processing the electric signal sent from the range finder unit and A strip width measuring device for a hot-rolled material, comprising: a computing unit that computes curved surface shapes on both side surfaces. 4. The strip width control method for a hot rolled material according to claim 1, wherein the strip width measurement device is the strip width measurement device according to claim 3.